Ambac Financial Group
Annual Report 2017

Plain-text annual report

AMBAC FINANCIAL GROUP, INC. 2017 ANNUAL REPORT ABOUT AMBAC Ambac Financial Group, Inc. (“Ambac” or “AFG”), headquartered in New York City, is a holding company whose subsidiaries, including its principal operating subsidiaries, Ambac Assurance Corporation (“AAC”), Everspan Financial Guarantee Corp. and Ambac Assurance UK Limited (“Ambac UK”), provide financial guarantees of obligations in both the public and private sectors globally. AAC is a guarantor of public finance and structured finance obligations. Ambac’s common stock trades on the NASDAQ Global Select Market under the symbol “AMBC”. The Amended and Restated Certificate of Incorporation of Ambac contains substantial restrictions on the ability to transfer Ambac’s common stock. Subject to limited exceptions, any attempted transfer of common stock shall be prohibited and void to the extent that, as a result of such transfer (or any series of transfers of which such transfer is a part), any person or group of persons shall become a holder of 5% or more of Ambac’s common stock or a holder of 5% or more of Ambac’s common stock increases its ownership interest. Ambac is committed to providing timely and accurate information to the investing public, consistent with our legal and regulatory obligations. To that end, we use our website to convey information about our businesses, including the anticipated release of quarterly financial results, quarterly financial, statistical and business-related information, and the posting of updates to the status of certain residential mortgage backed securities litigations. For more information, please go to www.ambac.com. Forward-Looking Statements In this Annual Report, we have included statements that may constitute “forward- looking statements” within the meaning of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Words such as “estimate,” “project,” “plan,” “believe,” “anticipate,” “intend,” “plan,” “potential” and similar expressions, or future or conditional verbs such as “will,” “should,” “would,” “could,” and “may,” or the negative of those expressions or verbs, identify forward-looking statements. We caution readers that these statements are not guarantees of future performance. Forward-looking statements are not historical facts but instead represent only our beliefs regarding future events, which, may by their nature be inherently uncertain and some of which may be outside our control. These statements may relate to plans and objectives with respect to the future, among other things which may change. We are alerting you to the possibility that our actual results may differ, possibly materially, from the expected objectives or anticipated results that may be suggested, expressed or implied by these forward-looking statements. Important factors that could cause our results to differ, possibly materially, from those indicated in the forward-looking statements include, among others, those discussed under “Risk Factors” in our most recently filed quarterly or annual report with the SEC. DEAR FELLOW SHAREHOLDERS “Our 2017 accomplishments reflect our focus and commitment to delivering long-term shareholder value.” CLAUDE LeBLANC President and Chief Executive Officer In January of 2017, we outlined our plans to build upon Ambac’s strong foundation and position the company for future growth. Throughout 2017, we executed on these plans and successfully accomplished several key financial, operational and regulatory objectives. As part of these accomplishments, during the year we laid the ground work for the successful execution of a transformational restructuring transaction. As a result of our efforts in 2017 we were able to conclude the rehabilitation of AAC’s Segregated Account in February 2018. In addition, for the first time since 2008, Ambac Financial Group’s 2017 audited financial statements were filed without the expression of substantial doubt about the company’s ability to continue as a going concern. This is a strong indication of Ambac’s materially improved financial health and further demonstrates our commitment towards positioning the company for future growth. As we move forward in 2018 we remain focused on our targeted strategic priorities, including successful risk management and implementing growth strategies that will drive sustainable long-term value for our shareholders. MILESTONE RESTRUCTURING TRANSACTION BENEFITS n Creation of material value for our shareholders • Estimated increase to Pro forma December 31, 2017 Book Value of approximately $7.56 per share or a 25% increase over year-end reported Book Value n Greater financial and strategic flexibility n A financially stronger AAC, making full payment on all future policy claims n Material reduction in ongoing rehabilitation and restructuring costs and other related expenses 1 Book Value/Share Adjusted Book Value/Share (1) 4 9 % C A G R ( 4 ) $37.41 $37.94 $38.08 $31.09 $30.52 $40 $35 $30 $25 $20 $15 $10 $5 $0 $15.62 $6.38 June 2013 Dec 2013 Dec 2014 Dec 2015 Dec 2016 Dec 2017 Pro forma(5) 2017 + $ 2 8 . 1 3 $28.15 $29.48 $24.34 $31.90 $15.01 $8.32 $3.77 June 2013 Dec 2013 Dec 2014 Dec 2015 Dec 2016 Dec 2017 Pro forma(5) 2017 40 $35 35 $30 30 $25 25 $20 20 $15 15 $10 10 $5 5 0 $0 35 30 25 20 15 10 5 0 KEY 2017 PERFORMANCE HIGHLIGHTS: • Milestone achievement of the successful exit from rehabilitation of AAC’s Segregated Account • Decreased our insured portfolio(2) by 21%, from $79.3 billion to $62.7 billion, and decreased ACCs by 17% from $17.0 billion to $14.1 billion • Opportunistically purchased $815.2 million of Ambac-insured securities; we currently own 58% of AAC’s insured COFINA bonds and 29% of AAC-insured PRIFA bonds • Reorganized operations and reduced costs- significant headcount reductions and future annual compensation savings of approximately 20% • Strengthened public finance loss reserves, resulting in a net loss of $(328.7) million, or $(7.25) per diluted share, and an Adjusted Loss (1) of $(165.1) million, or $(3.64) per diluted share • Ended 2017 with total AFG stockholders’ equity (“book value“) of $1.4 billion, or $30.52 per share, Adjusted Book Value (1) of $1.1 billion, or $24.34 per share, Pro forma Book Value(5) of $1.7 billion or $38.08 per share and Pro forma Adjusted Book Value(5) of $1.4 billion or $31.90 per share • Accrued $30.5 million of tolling payments resulting from the utilization of Net Operating Losses (“NOLs”) at AAC, which will be paid to AFG in May 2018, bringing AFG’s assets to over $400 million 2 Ambac’s key business activities are focused on risk management and stabilizing our insurance platform. During the year we took significant steps to deliver on this goal, reorganizing our Risk Group to sharpen and expand our focus on risk remediation activities. Our focus is not only on our Adversely Classified Credits (“ACCs”) but also Watch List Credits. Watch List Credits represent exposures for which there may be heightened potential for future adverse development based on qualitative and quantitative stress assumptions. We will target ACCs and Watch List Credits in our efforts to improve the overall quality of AAC’s insured portfolio and balance sheet. We believe that a focus on the long- term stability of our balance sheet and quality of our book value is key to achieving our goal of delivering long-term shareholder value. Consistent with our strategic focus, during 2017 we successfully decreased our ACCs by 17% from $17.0 billion to $14.1 billion including through several targeted de-risking initiatives. Our actions drove the improvement of our overall risk profile by decreasing our insured portfolio from $79.3 billion to $62.7 billion, or 21%. Notwithstanding our many achievements during the year, Ambac and the financial guaranty sector as a whole experienced increased uncertainty from exposure to Puerto Rico, leading to downward pressure on share prices. believe much work remains to be done. The fundamental requirements of and Congressional intent behind the PROMESA law are the stabilization of Puerto Rico’s financial and economic profile, institutionalization of fiscal responsibility, and restoration of capital market access. However, none of these objectives can be achieved without increased transparency and accountability from the Commonwealth and Oversight Board, respect for lawful priorities and liens, and effective comprehensive fiscal reform with a focus on economic growth. Furthermore, the Commonwealth and Oversight Board will need to make material changes to their approach with creditors to avoid long and protracted litigation which will come at the expense of the residents of Puerto Rico and U.S. tax payers. In 2018, we hope to see increased clarity around the issues surrounding Puerto Rico. Ambac will continue to actively pursue dialogue with local and federal officials and progress all aspects of our strategy with respect to mitigating losses on our Puerto Rico exposure. Insured Portfolio (2) SELECT DE-RISKING ACTIVITIES n Commuted certain interest rate swaps between Augusta Funding Limited IV and Ambac Financial Services resulting in a gain of $43.4 million and approximately $2.6 million in accelerated premiums n Facilitated an international asset-backed issuer’s refinancing of £188.1 million of Ambac-insured debt, resulting in accelerated premiums to Ambac UK of $11.2 million n Terminated 20 RMBS transactions, resulting in the reduction of adversely classified net par exposure by $422.5 million n Realized a benefit of $91.6 million as a result of the settlement between Ballantyne and JPMorgan Investment Management, Inc. n Commuted/refinanced approximately $220.1 million of net par exposure related to several other distressed exposures While our exposure to Puerto Rico remains one of our biggest challenges, we believe that we are better positioned to manage our risk based on actions we have taken. During the year, we increased our public finance reserves largely as a result of developments related to Puerto Rico, including Hurricane Maria. We are pleased the Bipartisan Budget Act of 2018 provides for billions in additional federal recovery aid to Puerto Rico and requires the Governor of Puerto Rico to develop a 12- and 24-month economic and disaster recovery plan with periodic progress reports to Congress. However, we $62.7 BILLION NET PAR Reducing operating expenses was also a key priority for us and in 2017 we took significant steps to implement a corporate-wide reorganization to improve operational effectiveness and reduce expenses. These actions reduced headcount by 19%, which will result in future annual compensation costs savings of approximately 3 InternationalPublic Finance51%27%Structured Finance22% Insured Portfolio Net Par (2) ($ in billions) Adversely Classified Credits Net Par (2),(3) ($ in billions) $250 $200 $150 $100 $50 $0 # of Credits 6,000 Reduced by 21% in 2017 4,000 2,000 0 June 2013 Dec 2013 Dec 2014 Dec 2015 Dec 2016 Dec 2017 PF SF Int’l # of Credits $35 250 $30 200 $25 150 $20 $15 100 $10 50 $5 $0 0 6000 4000 Reduced by 17% in 2017 June 2013 Dec 2013 Dec 2014 Dec 2015 Dec 2016 Dec 2017 IA II III IV 35 30 25 20 15 10 5 0 20% or $8.5 million. These initiatives were focused on reducing expenses and taking other meaningful steps to reorganize our operations and create a more effectively-run platform. We also expect to see additional material reductions in run-rate expenses relating to regulatory and restructuring costs following the exit from rehabilitation of AAC’s Segregated Account. We will continue to pursue additional cost cutting measures as we progress our portfolio runoff. On the loss recovery side, we continued to progress the prosecution of our RMBS-related litigation which remains a key value-driver for our company and our shareholders. We are confident in the strength of our claims and will continue to pursue our cases through trial if necessary. Lastly, during 2017, management and the Board completed a review of our long-term strategy. While this strategy remained largely intact, we have updated our strategic priorities based on our achievements and future business plans. As we consider potential new businesses we will focus on opportunities that (i) are adjacent to our core business, (ii) create additional long-term value with attractive risk-adjusted returns (under certain acceptable financial criteria) and (iii) are well positioned to create value through synergies and utilization of Ambac’s net operating loss carry-forwards. AFG is expecting to receive an NOL tolling payment from AAC for the third consecutive year under the terms 4 0 2000 of the intercompany Tax Sharing Agreement. The 2018 payment will be $30.5 million. Since Ambac’s emergence from bankruptcy in 2013 the NOLs have preserved approximately $691 million of value for shareholders and have facilitated approximately $130.6 million of value through paid and accrued tolling payments to AFG. During the year, we remained proactively engaged with our shareholders and in response to your feedback continued to refine our compensation metrics to further align them with the interests of our shareholders. A revised compensation structure that is metrics driven was implemented in 2017, determined by a mix of qualitative and quantitative criteria as well as equity ownership requirements for executives. We also made changes to our non-employee director base compensation plan. Starting in 2017 non-employee director cash retainer and stock-based compensation, in the aggregate, was reduced by 33% compared to 2016 with a higher percentage of equity compared to cash compensation. The exit from rehabilitation of the Segregated Account also resulted in a simplified governance structure with the removal of the requirement to have unaffiliated directors on the AAC Board. In evaluating our needs and Board composition post exit from rehabilitation we considered the Board’s skill set and experience as well as our diversity objectives. On March 1st we announced the appointment of Ms. Joan Lamm-Tennant as a new director at both the AFG and AAC Boards. Joan’s extensive experience in the insurance industry and her STRATEGIC PRIORITIES n Active runoff of AAC and its subsidiaries through transaction terminations, policy commutations, settlements and restructurings, with a focus on our watch list and adversely classified credits, that we believe will improve our risk profile, and maximizing the risk-adjusted return on invested assets n Ongoing rationalization of Ambac’s and its subsidiaries’ capital and liability structures n Loss recovery through active litigation management and exercise of contractual and legal rights n Ongoing review of organizational effectiveness and efficiency of the operating platform n Evaluation of opportunities in certain business sectors that meet acceptable criteria and will generate long-term stockholder value with attractive risk-adjusted returns entrepreneurial drive promise to serve us well as we move forward post exit from rehabilitation. We are pleased to welcome Ms. Lamm-Tennant to our Board. Following the execution of our transformational restructuring transaction we are excited about the future and believe we are well positioned to explore and advance the opportunities available to us within our new operating paradigm. We would like to thank our employees for their ongoing commitment, support and dedication, which is instrumental in helping us achieve our stated goals. Looking ahead to 2018, we will remain focused on advancing our strategic priorities to improve our risk profile and quality of our book value in order to maximize returns for shareholders. We remain steadfast in our commitment to our shareholders and we will look to build upon our momentum in 2018 with the goal to continue to deliver long-term shareholder value. Claude LeBlanc President and Chief Executive Officer (1) Ambac reports two non-GAAP financial measures: Adjusted Earnings (Loss) and Adjusted Book Value. The most directly comparable GAAP measures are net income attributable to common stockholders for Adjusted Earnings (Loss) and Total Ambac Financial Group, Inc. stockholders’ equity for Adjusted Book value. A non-GAAP financial measure is a numerical measure of financial performance or financial position that excludes (or includes) amounts that are included in (or excluded from) the most directly comparable measure calculated and presented in accordance with GAAP. We are presenting these non-GAAP financial measures because they provide greater transparency and enhanced visibility into the underlying drivers of our business. Adjusted Earnings (Loss) and Adjusted Book Value are not substitutes for the Company’s GAAP reporting, should not be viewed in isolation and may differ from similar reporting provided by other companies, which may define non-GAAP measures differently. Each of the reconciling items is presented in Appendix A to this Annual Report. (2) Par throughout this Annual Report includes capital appreciation bonds (“CABs”) which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bonds. (3) Adversely Classified Credits: Class IA - Potential Problem with Risks to be Dimensioned; Class II - Substandard Requiring Intervention; Class III Doubtful with Clear Potential for Loss; Class IV – Imminent Default or Defaulted. See Ambac’s 2017 Form 10-K for further description of risk classifications. (4) Compound Annual Growth Rate (“CAGR”). (5) Pro forma information reflects unaudited adjustments attributable to the Rehabilitation Exit Transactions and Tier 2 Notes Issuance. See page 70 of this Annual Report for reconciliation. 5 BOARD OF DIRECTORS EXECUTIVE OFFICERS Claude LeBlanc President and Chief Executive Officer David Trick Executive Vice President, Chief Financial Officer and Treasurer David Barranco Senior Managing Director, Head of Risk Management and Corporate Development Robert B. Eisman Senior Managing Director, Chief Accounting Officer and Controller Stephen M. Ksenak Senior Managing Director and General Counsel Michael Reilly Senior Managing Director, Chief Information Officer and Chief Administrative Officer R. Sharon Smith Senior Managing Director and Chief of Staff Jeffrey S. Stein (3) Founder and Managing Partner of Stein Advisors LLC Chairman since 2015 Director since 2013 Alexander D. Greene(2), (3)*, (4) Former Managing Partner and Head of U.S. Private Equity at Brookfield Asset Management Director since 2015 Ian D. Haft (1), (2), (4)* Founding Partner at Cornwall Capital Management LP Director since 2016 David L. Herzog (1)*, (4) Former Chief Financial Officer of AIG Director since 2016 C. James Prieur (1), (2)*, (3) Former Chief Executive Officer of CNO Financial Group, Inc. Director since 2016 Claude LeBlanc President and Chief Executive Officer Director since 2017 Joan Lamm-Tennant (1), (4) Founder and Chief Executive Officer of Blue Marble Microinsurance Director since 2018 (1) Member of Audit Committee (2) Member of Compensation Committee (3) Member of Governance and Nominating Committee (4) Member of Strategy and Risk Policy Committee *Chair of Committee 6 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2017 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 1-10777 Ambac Financial Group, Inc. (Exact name of Registrant as specified in its charter) Delaware (State of incorporation) One State Street Plaza, New York, New York (Address of principal executive offices) 13-3621676 (I.R.S. employer identification no.) 10004 (Zip code) 212-658-7470 (Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act: None Securities registered pursuant to Section 12(g) of the Act: None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes No Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes No Indicate by check mark whether the registrant has submitted electronically and posted on its corporate web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes No Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of Registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III in this Form 10-K or any amendment to this Form 10-K. Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See definition of “large accelerated filer”, “accelerated filer”, “smaller reporting company”and"emerging growth company" in Rule 12b-2 of the Exchange Act): (Check one): Large accelerated filer Accelerated filer Non-accelerated filer Smaller reporting company Emerging growth company If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes No Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Section 12, 13, or 15(d) of the Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court. Yes No The aggregate market value of voting stock held by non-affiliates of the Registrant as of the close of business on June 30, 2017 was $785,107,730. As of February 27, 2018, there were 45,278,480 shares of Common Stock, par value $0.01 per share, were outstanding. Portions of the Registrant’s proxy statement for its 2018 annual meeting of stockholders are incorporated by reference in this Form 10-K in response to Part III Items 10, 11, 12, 13, and 14. Documents Incorporated By Reference [ THIS PAGE INTENTIONALLY LEFT BLANK ] AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES TABLE OF CONTENTS Cautionary Statement Pursuant to the Private Securities Litigation Reform Act of 1995 PART I Item 1. Business.......................................................................................................................................................................... Introduction ............................................................................................................................................................... Risk Management Group .......................................................................................................................................... Insurance Regulatory Matters and Other Restrictions .............................................................................................. Investments and Investment Policy........................................................................................................................... Employees................................................................................................................................................................. Item 1A. Risk Factors.................................................................................................................................................................... Item 1B. Unresolved Staff Comments .......................................................................................................................................... Properties........................................................................................................................................................................ Item 2. Item 3. Legal Proceedings .......................................................................................................................................................... Item 4. Mine Safety Disclosures ................................................................................................................................................. PART II Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities .... Item 6. Selected Financial Data .................................................................................................................................................. Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations ......................................... Company Overview .................................................................................................................................................. Executive Summary .................................................................................................................................................. Critical Accounting Policies and Estimates .............................................................................................................. Financial Guarantees in Force................................................................................................................................... Results of Operations ................................................................................................................................................ Liquidity and Capital Resources ............................................................................................................................... Balance Sheet............................................................................................................................................................ Special Purpose Entities Including Variable Interest Entities ................................................................................... Accounting Standards ............................................................................................................................................... Ambac Assurance Statutory Basis Financial Results................................................................................................ Ambac Assurance UK Limited Financial Results Under UK Accounting Principles .............................................. Non-GAAP Financial Measures ............................................................................................................................... Pro Forma Balance Sheet and Proforma Adjusted Book Value ................................................................................ Item 7A. Quantitative and Qualitative Disclosures About Market Risk ....................................................................................... Financial Statements and Supplementary Data .............................................................................................................. Item 8. Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure ........................................ Item 9A. Controls and Procedures ................................................................................................................................................. Item 9B. Other Information ........................................................................................................................................................... PART III Item 10. Directors, Executive Officers and Corporate Governance ............................................................................................. Executive Compensation ................................................................................................................................................ Item 11. Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters ...................... Item 13. Certain Relationships and Related Transactions, and Director Independence ............................................................... Principal Accountant Fees and Services ......................................................................................................................... Item 14. PART IV Item 15. Exhibits, Financial Statement Schedules ........................................................................................................................ Schedule I—Summary of Investments Other Than Investments in Related Parties ................................................. Schedule II—Condensed Financial Information of Registrant (Parent Company Only) ......................................... Schedule IV—Reinsurance ....................................................................................................................................... 1 2 2 5 8 9 10 10 26 26 26 26 26 28 29 29 29 31 37 50 56 59 64 64 65 66 67 70 71 74 157 157 157 157 157 158 158 158 158 163 164 169 SIGNATURES...................................................................................................................................................................................... 170 [ THIS PAGE INTENTIONALLY LEFT BLANK ] CAUTIONARY STATEMENT PURSUANT TO THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995 In this Annual Report, we have included statements that may constitute “forward-looking statements” within the meaning of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Words such as “estimate,” “project,” “plan,” “believe,” “anticipate,” “intend,” “planned,” “potential” and similar expressions, or future or conditional verbs such as “will,” “should,” “would,” “could,” and “may,” or the negative of those expressions or verbs, identify forward-looking statements. We caution readers that these statements are not guarantees of future performance. Forward-looking statements are not historical facts but instead represent only our beliefs regarding future events, which may by their nature be inherently uncertain and some of which may be outside our control. These statements may relate to plans and objectives with respect to the future, among other things which may change. We are alerting you to the possibility that our actual results may differ, possibly materially, from the expected objectives or anticipated results that may be suggested, expressed or implied by these forward-looking statements. Important factors that could cause our results to differ, possibly materially, from those indicated in the forward-looking statements include, among others, those discussed under “Risk Factors” in Part I, Item 1A of this Annual Report on Form 10-K. Any or all of management’s forward-looking statements here or in other publications may turn out to be incorrect and are based on management’s current belief or opinions. Ambac’s actual results may vary materially, and there are no guarantees about the performance of Ambac’s securities. Among events, risks, uncertainties or factors that could cause actual results to differ materially are: (1) the highly speculative nature of Ambac’s common stock and volatility in the price of Ambac’s common stock; (2) uncertainty concerning the Company’s ability to achieve value for holders of its securities, whether from Ambac Assurance Corporation ("Ambac Assurance) or from transactions or opportunities apart from Ambac Assurance; (3) adverse effects on Ambac’s share price resulting from future offerings of debt or equity securities that rank senior to Ambac’s common stock; (4) potential of rehabilitation proceedings against Ambac Assurance; (5) dilution of current shareholder value or adverse effects on Ambac’s share price resulting from the issuance of additional shares of common stock; (6) inadequacy of reserves established for losses and loss expenses and possibility that changes in loss reserves may result in further volatility of earnings or financial results; (7) decisions made by Ambac Assurance's primary insurance regulator for the benefit of policyholders that may result in material adverse consequences for holders of the Company’s securities or holders of securities issued or insured by Ambac Assurance; (8) increased fiscal stress experienced by issuers of public finance obligations or an increased incidence of Chapter 9 filings or other restructuring proceedings by public finance issuers; (9) failure to recover claims paid on Puerto Rico exposures or incurrence of losses in amounts higher than expected; (10) the Company’s inability to realize the expected recoveries included in its financial statements; (11) changes in Ambac Assurance’s estimated representation and warranty recoveries or loss reserves over time; (12) insufficiency or unavailability of collateral to pay secured obligations; (13) credit risk throughout the Company’s business, including but not limited to credit risk related to residential mortgage-backed securities, student loan and other asset securitizations, collateralized loan obligations, public finance obligations and exposures to reinsurers; (14) credit risks related to large single risks, risk concentrations and correlated risks; (15) concentration and essentiality risk in connection with Military Housing insured debt; (16) the risk that the Company’s risk management policies and practices do not anticipate certain risks and/or the magnitude of potential for loss; (17) risks associated with adverse selection as the Company’s insured portfolio runs off; (18) adverse effects on operating results or the Company’s financial position resulting from measures taken to reduce risks in its insured portfolio; (19) intercompany disputes or disputes with Ambac Assurance's primary insurance regulator; (20) our inability to mitigate or remediate losses, commute or reduce insured exposures or achieve recoveries or investment objectives, or the failure of any transaction intended to accomplish one or more of these objectives to deliver anticipated results; (21) the Company’s substantial indebtedness could adversely affect its financial condition and operating flexibility; (22) the Company may not be able to obtain financing or raise capital on acceptable terms or at all due to its substantial indebtedness and financial condition; (23) restrictive covenants in agreements and instruments may impair the Company’s ability to pursue or achieve its business strategies; (24) loss of control rights in transactions for which we provide insurance due to a finding that Ambac Assurance has defaulted, whether due to the Segregated Account rehabilitation proceedings or otherwise; (25) the Company’s results of operation may be adversely affected by events or circumstances that result in the accelerated amortization of the Company’s insurance intangible asset; (26) adverse tax consequences or other costs resulting from the the Segregated Account rehabilitation plan, or from characterization of the Company’s surplus notes or other obligations as equity; (27) risks attendant to the change in composition of securities in the Company’s investment portfolio; (28) changes in tax law; (29) changes in prevailing interest rates; (30) changes on inter-bank lending rate reporting practices or the method pursuant to which LIBOR rates are determined; (31) factors that may influence the amount of installment premiums paid to the Company, including the Segregated Account rehabilitation proceedings; (32) default by one or more of Ambac Assurance's portfolio issuers or investments, counterparties; (33) market risks impacting assets in the Company’s investment portfolio or the value of our assets posted as collateral in respect of interest rate swap transactions; (34) risks relating to determinations of amounts of impairments taken on investments; (35) the risk of litigation and regulatory inquiries or investigations, and the risk of adverse outcomes in connection therewith, which could have a material adverse effect on the Company’s business, operations, financial position, profitability or cash flows; (36) actions of stakeholders whose interests are not aligned with broader interests of the Company's stockholders; (37) the Company’s inability to realize value from Ambac UK or other subsidiaries of Ambac Assurance; (38) system security risks; (39) market spreads and pricing on interest rate derivative insured or issued by the Company; (40) the risk of volatility in income and earnings, including volatility due to the application of fair value accounting; (41) changes in accounting principles or practices that may impact the Company’s reported financial results; (42) legislative and regulatory developments, including intervention by regulatory authorities; (43) the economic impact of “Brexit” may have an adverse effect on the Company’s insured international portfolio and the value of its foreign investments, both of which insured | Ambac Financial Group, Inc. 1 2017 FORM 10-K | primarily reside with its subsidiary Ambac UK; (44) operational risks, including with respect to internal processes, risk and investment models, systems and employees, and failures in services or products provided by third parties; (45) the Company’s financial position that may prompt departures of key employees and may impact the Company’s ability to attract qualified executives and employees; (46) implementation of new tax legislation signed into law on December 22, 2017 (commonly known as the “Tax Cuts and Jobs Act”) may have unexpected consequences for the Company and the value of its securities, particularly its common shares; (47) implementation of the Tax Cuts and Jobs Act may negatively impact the economic recovery of Puerto Rico, which could result in higher loss severities or an extended moratorium on debt service owed on Ambac Assurance- insured bonds of Puerto Rico and its instrumentalities; (48) implementation of the Tax Cuts and Jobs Act could have a negative impact on municipal issuers of Ambac-insured bonds; and (49) other risks and uncertainties that have not been identified at this time. PART I Item 1. Business INTRODUCTION the Ambac Financial Group, Inc. (“Ambac,” "AFG" or “Company”), headquartered in New York City, is a financial services holding company incorporated in the State of Delaware on April 29, 1991. Ambac’s provides financial guarantee policies through its principal operating subsidiary, Ambac Assurance Corporation ("Ambac Assurance" or "AAC") and its wholly owned subsidiary Ambac Assurance UK Limited (“Ambac UK”), both of which have been in runoff since 2008. Ambac has another wholly-owned subsidiary, Everspan Financial Guarantee Corp. (“Everspan”), which has been in runoff since its acquisition in 1997. Insurance policies issued provide an unconditional and irrevocable guarantee which protects the holder of a debt obligation against non-payment when due of the principal and interest on the obligations guaranteed. Pursuant to such guarantees, Ambac Assurance and its subsidiaries make payments if the obligor responsible for making payments fails to do so when scheduled. Revenues from financial guarantees consist of: (i) premiums earned from insurance contracts, net of reinsurance, whether received upfront or on an installment basis and (ii) amendment and consent fees. Expenses from financial guarantees consist of: (i) loss and commutation payments for credit exposures; (ii) loss-related expenses, including those relating to the remediation of problem credits; and (iii) insurance intangible amortization. Ambac Assurance has another wholly owned subsidiary, Ambac Credit Products LLC (“ACP”) that issued credit derivative contracts for which it collects fees over the contract term. Credit derivative contract terms are substantially similar to financial guarantee insurance. Credit derivatives also permit certain counterparties to assert mark-to-market termination claims under certain conditions; however, the assertion of such mark-to-market claims has been enjoined by the Second Amended Plan of Rehabilitation (as defined below) and orders of the Rehabilitation Court (as defined below). See discussion of “Ambac Assurance Liquidity” in Part II, Item 7 included in this Form 10-K for further information. Ambac Assurance and its subsidiaries have been working toward reducing uncertainties within its insured portfolio through active monitoring of key exposures such as municipal entities (including Puerto Rico), asset-backed securities (including residential mortgage-backed ("RMBS") and student loans) and municipal entities with stressed financial conditions. Additionally, Ambac Assurance and its subsidiaries are actively prosecuting legal claims (including RMBS related lawsuits), managing the regulatory framework applicable to the insurance entities, seeking to optimize capital allocation in a challenging environment that includes long duration obligations, and attempting to retain key employees. The deterioration of the financial condition of Ambac Assurance and Ambac UK beginning in 2007 has prevented these companies from being able to write new business. An inability to write new business has and will continue to negatively impact Ambac’s future operations and financial results. Ambac Assurance’s ability to pay dividends and, as a result, Ambac’s liquidity, have been significantly restricted by the deterioration of Ambac Assurance’s financial condition and by regulatory, legal and contractual restrictions. It is highly unlikely that Ambac Assurance will be able to make dividend payments to Ambac for the foreseeable future. Including Contractual Refer Restrictions" below and Note 8. Insurance Regulatory Restrictions to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K, for more information on dividend payment restrictions. "Dividend Restrictions, to Prior to the second quarter of 2017, Ambac had two reportable business segments: i) the financial guarantee segment, which consisted of financial guarantee insurance policies and credit derivative contracts and ii) the financial services segment which consisted of other financial products. In the second quarter of 2017, the Company began reporting financial guarantee as its only reportable business segment. Factors management took into consideration when eliminating the financial services segment included (i) significant swap commutations in June 2017, which left the remaining interest rate swaps and other interest rate derivatives as hedges against interest rate risk in the financial guarantee and investment portfolios, (ii) the maturity of the last investment agreement in March 2017, (iii) the immateriality of the remaining conduit transactions, and (iv) the appointment of a new Chief Executive Officer effective January 1, 2017. Management now reviews financial information, allocates resources and measures financial performance on a consolidated basis. All prior period amounts and disclosures have been adjusted to reflect the reportable segment change. On May 1, 2013, Ambac emerged from Chapter 11 bankruptcy protection when the Second Modified Fifth Amended Plan of Reorganization became effective. Upon emergence Ambac had no outstanding debt at the holding company and significant net operating loss carry-forwards, of which $3.7 billion remain at December 31, 2017. Interest Rate Derivatives: Interest rate derivative transactions are executed through Ambac Financial Services (“AFS”), a wholly-owned subsidiary of Ambac Assurance. As noted above, the primary activities of AFS is to | Ambac Financial Group, Inc. 2 2017 FORM 10-K | economically hedge interest rate risk in the financial guarantee and Accordingly, these derivatives are investment portfolios. positioned to benefit from rising rates. Under agreements governing the derivative positions, AFS generally must post collateral or margin in excess of the market value of the swaps and futures contracts. In addition, most of AFS’s counterparties currently possess the right to terminate their transactions with AFS and in the event of a rehabilitation of Ambac Assurance, some of AFS’s swaps could automatically terminate. A sudden termination of AFS’s derivatives, whether voluntarily or automatically, could result in losses. AFS has borrowed cash and securities from Ambac Assurance, to help support its collateral and margin posting requirements, previous termination payments and other cash needs. Ambac derives interest rate derivative revenues from (i) changes in the fair value of the derivatives portfolio resulting from interest rate fluctuations and (ii) the value of future contract terminations or settlements which may differ from the carrying value of the those contracts. Credit risks relating to derivative positions primarily concern the default of a counterparty. Ambac's interest rate derivatives generally consist of centrally cleared swaps, US treasury futures and some over-the-counter ("OTC") swaps with financial guarantee customers or bank counterparties. Counterparty default exposure is mitigated through the use of industry standard collateral posting agreements or margin posting requirements. Cleared swaps, futures and OTC derivatives with bank counterparties require margin or collateral to be posted up to or in excess of the market value of the derivatives. Derivative contracts entered into with financial guarantee customers are not subject to collateral posting agreements. Credit risk associated with such customer derivatives, including credit derivatives, is managed through the risk management processes described in the Risk Management Group section below. In some cases, derivatives between Ambac and financial guarantee customers are placed through a third party financial intermediary and similarly do not require collateral posting. AFS manages a variety of market risks inherent in its businesses, including credit, market, liquidity, operational and legal. These risks are identified, measured, and monitored through a variety of control mechanisms, which are in place at different levels throughout the organization. See “Quantitative and Qualitative Disclosures About Market Risk” included in Part II, Item 7A in this Form 10-K for further information. Investment Agreements: issuers through Ambac Assurance issued investment agreements to structured finance and municipal its wholly-owned subsidiary, Ambac Capital Funding. Investment agreements were customized for each investor to provide guaranteed interest and return of principal in accordance with their requirements. Each investment agreement was insured by Ambac Assurance through a financial guarantee insurance policy. The last investment agreement matured in March 2017. Funding Conduits: A subsidiary of Ambac previously transferred financial assets to two special purpose entities. The business purpose of these entities was to provide certain financial guarantee clients with funding for their debt obligations. The activities of the special purpose entities are contractually limited to purchasing assets from Ambac, issuing medium-term notes (“MTNs”) to fund such purchases, executing derivative hedges and obtaining financial guarantee policies with respect to indebtedness incurred. As of December 31, 2017, Ambac Assurance or Ambac UK had financial guarantee insurance policies issued for all assets, MTNs and derivative contracts owned and outstanding by the entities. Ambac does not consolidate these entities under the relevant accounting guidance for consolidation of variable interest entities. See Note 2. Basis of Presentation and Significant Accounting Policies and Note 3. Special Purpose Entities, Including Variable Interest Entities to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10- K for further information. Corporate Strategy: In February 2018, Ambac achieved one of its key strategic strategies, the exit from rehabilitation of Ambac Assurance’s Segregated Account (as defined below). Having accomplished this milestone, Ambac will continue to pursue and prioritize its remaining key strategic priorities, namely: • Active runoff of Ambac Assurance and its subsidiaries through transaction terminations, policy commutations, settlements and restructurings, with a focus on our watch list credits and known and potential future adversely classified credits, that we believe will improve our risk profile, and maximizing the risk-adjusted return on invested assets; • Ongoing rationalization of Ambac's and its subsidiaries' capital and liability structures; • Loss recovery through active litigation management and exercise of contractual and legal rights; • Ongoing review of organizational effectiveness and efficiency of the operating platform; and • Evaluation of opportunities in certain business sectors that meet acceptable criteria that will generate long-term stockholder value with attractive risk-adjusted returns. With respect to our new business strategy, we have identified certain business sectors adjacent to Ambac's core business, in which future opportunities will be evaluated. The evaluation will be conducted through a measured and disciplined approach to identify opportunities that are synergistic to Ambac, match Ambac's core competencies, are rapidly scalable or available through mergers and acquisitions and that may allow for the utilization of Ambac's net operating loss carry-forwards. Although we are exploring new business opportunities for Ambac, no assurance can be given that we will be able to execute and/or obtain the financial and other resources that may be required to finance the acquisition or development of any new businesses or assets. Due to these factors, as well as uncertainties relating to the ability of Ambac Assurance to deliver value to Ambac, the value of our securities remains speculative. The execution of Ambac’s strategy to increase the value of its investment in Ambac Assurance is subject to the restrictions set forth in the Settlement Agreement, dated as of June 7, 2010 (the "Settlement Agreement"), by and among Ambac Assurance, ACP, Ambac and certain counterparties to credit default swaps with ACP | Ambac Financial Group, Inc. 3 2017 FORM 10-K | that were guaranteed by Ambac Assurance, as well as the Stipulation and Order (as defined in Note 1. Background and Business Description to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K), each of which requires OCI (and in the case of the Settlement Agreement, under certain circumstances, holders of surplus notes issued pursuant to the Settlement Agreement) to approve certain actions taken by or in respect of Ambac Assurance. In exercising its rights under the Stipulation and Order or Settlement Agreement, OCI will act for the benefit of policyholders, and will not take into account the interests of Ambac. See Note 1. Background and Business Description to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for further information. Opportunities for remediating losses on poorly performing insured transactions also depend on market conditions, including the perception of Ambac Assurance’s creditworthiness, the structure of the underlying risk and associated policy as well as other counterparty specific factors. Ambac Assurance's ability to commute policies or purchase certain investments may also be limited by available liquidity. Segregated Account In March 2010, Ambac Assurance established a segregated account pursuant to Wisconsin Stat. §611.24(2) (the “Segregated Account”) to segregate certain segments of Ambac Assurance’s liabilities. The Office of the Commissioner of Insurance for the State of Wisconsin (“OCI” (which term shall be understood to refer to such office as regulator of Ambac Assurance and to refer to the Commissioner of Insurance for the State of Wisconsin as rehabilitator of the Segregated Account (the “Rehabilitator”), as the context requires)) commenced rehabilitation proceedings in the Wisconsin Circuit Court for Dane County (the “Rehabilitation Court”) with respect to the Segregated Account (the “Segregated Account Rehabilitation Proceedings”) in order to permit OCI to facilitate an orderly run-off and/or settlement of the liabilities allocated to the Segregated Account pursuant to the provisions of the Wisconsin Insurers Rehabilitation and Liquidation Act. Ambac Assurance is not, itself, in rehabilitation proceedings. On October 8, 2010, OCI filed a plan of rehabilitation for the Segregated Account (the "Segregated Account Rehabilitation Plan") in the Rehabilitation Court. The Rehabilitation Court confirmed the Segregated Account Rehabilitation Plan on January 24, 2011. On June 11, 2014, the Rehabilitation Court approved amendments to the Segregated Account Rehabilitation Plan and the Segregated Account Rehabilitation Plan, as amended, became effective on June 12, 2014. On September 25, 2017 the Rehabilitator filed a motion in the Rehabilitation Court seeking entry of an order approving an amendment to the Segregated Account Rehabilitation Plan (the "Second Amended Plan of Rehabilitation"). Following the conclusion of a Confirmation Hearing on January 22, 2018, the Rehabilitation Court entered an order granting the Rehabilitator's motion and confirming the Second Amended Plan of Rehabilitation. On February 12, 2018 (the "Effective Date"), the Second Amended Plan of Rehabilitation became effective. Consequently, the rehabilitation of the Segregated Account was concluded. Refer to Note 1. Background and Business Description to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K, for more information on the Segregated Account and the Segregated Account Rehabilitation Proceedings. Enterprise Risk Management The Company's policies and procedures relating to risk assessment and risk management are overseen by its Board of Directors. The Board takes an enterprise-wide approach to risk management oversight that is designed to support the Company's business plans at a reasonable level of risk. A fundamental part of risk assessment and risk management is not only understanding the risks the Company faces and what steps management is taking to manage those risks, but also understanding what level of risk is appropriate for the Company. The Board of Directors annually reviews the Company's business plan, factoring risk management into account. It also approves the Company's risk appetite statements, which articulate the Company's tolerance for certain risks and describes the general types of risk that the Company accepts, within certain parameters, or attempts to avoid. While the Board of Directors has the ultimate oversight the risk management process, various responsibility for committees of the Board also have responsibilities related to risk assessment and risk management, and management has responsibility for managing the risks to which the Company is exposed and reporting on such matters to the Board of Directors and applicable Board committees. • The Audit Committee oversees the management of risks associated with the integrity of Ambac’s financial statements and its compliance with legal and regulatory requirements. In addition, the Audit Committee discusses policies with respect to risk assessment and risk management, including major financial risk exposures and the steps management has taken to monitor and control such exposures. The Audit Committee reviews with management, internal auditors, and external auditors Ambac's accounting policies, Ambac's system of internal controls over financial reporting and the quality and appropriateness of disclosure and content in the financial statements and other external financial communications. • The Compensation Committee oversees the management of risk primarily associated with our ability to attract, motivate and retain quality talent, particularly executive talent, compensation structures that might lead to undue risk taking, and disclosure of our executive compensation philosophies, strategies and activities. • The Governance and Nominating Committee oversees the management of risk primarily associated with Ambac’s ability to attract and retain quality directors, Ambac’s corporate governance programs and practices and our compliance therewith. Additionally, the Governance and Nominating Committee oversees the processes for evaluation of the performance of the Board, its committees and management each year and considers risk management effectiveness as part of its evaluation. The Governance and Nominating Committee also performs oversight of the business ethics and compliance program, and reviews compliance with Ambac’s Code of Business Conduct. • The Strategy and Risk Policy Committee oversees the management of risk and risk appetite primarily with respect to strategic plans and initiatives, oversight of Ambac’s capital | Ambac Financial Group, Inc. 4 2017 FORM 10-K | structure, financing and treasury matters and oversight of management's process for the identification, evaluation and mitigation of Ambac’s financial and commercial-related risks. The full Board also receives quarterly updates from Board committees, and the Board provides guidance to individual committee activities as appropriate. In order to assist the board of directors in overseeing Ambac’s risk management, Ambac uses enterprise risk management, a company-wide process that involves the Board of Directors, management and other personnel in an integrated effort to identify, assess and manage a broad range of risks (e.g., credit, financial, legal, liquidity, market, model, operational, regulatory and strategic), that may affect the Company’s ability to execute on its corporate strategy and fulfill its business objectives. The Enterprise Risk Committee (“ERC”), which is a management committee, is comprised of senior level management responsible for assisting in the management of the Company’s risks on an individual and aggregate basis. The ERC produces the relevant risk management information for senior management, the Board of Directors and applicable Board committees. Ambac management has established other committees to assist in managing the risks embedded in the enterprise. These committees will meet monthly or as needed on an ad hoc basis. • The Asset Liability Management Committee's (“ALCO”) objective is to foster an enterprise wide culture and approach to liquidity management, asset management, asset valuation and hedging. Members of ALCO include the Chief Executive Officer, Chief Financial Officer and senior managers from investment management and the Risk Management Group. • The Risk Committee's objective is establish an interdisciplinary team of professionals from different parts of the company to provide oversight of the key risk remediation issues impacting Ambac. The purview of the committee is to review and approve risk remediation activities for the financial guarantee insured portfolio as well as review changes to Ambac's adversely classified, survey and watch list credits (as defined in Note 2. Basis of Presentation and Significant Accounting Policies). This committee was established in the fourth quarter of 2017. Previously, most risk remediation activities were approved by ALCO. Members of the Risk Committee include the Chief Executive Officer, Head of Risk Management, Chief Financial Officer and senior managers from throughout risk, corporate services group, operations, investment management, legal and finance. Available Information Our Internet address is www.ambac.com. We make available free of charge, through the investor relations section of our web site, annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K, and any amendments to those reports, filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, as well as proxy statements, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the U.S. Securities and Exchange Commission. Our Investor Relations Department can be contacted at Ambac Financial Group, Inc., One State Street Plaza, New York, New York 10004, Attn: Investor Relations, telephone: 212-208-3222 email: ir@ambac.com. The reference to our website address does not constitute inclusion or incorporation by reference of the information contained on our website in this Form 10-K or other filings with the SEC, and the information contained on our website is not part of this document. RISK MANAGEMENT GROUP Financial guarantee insurance and credit derivatives ("financial guarantees") were sold in three principal markets: U.S. public finance, U.S. structured finance and international finance. Ambac’s financial guarantee insurance policies and credit derivative contracts expose the Company to the direct credit risk of the assets and/or obligor supporting the guaranteed obligation. In addition, insured transactions expose Ambac to indirect risks that may increase our overall risk, such as credit risk separate from, but correlated with, our direct credit risk, market, model, economic, natural disaster and mortality or other non-credit type risks. Please refer to Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Financial Guarantees in Force” section below for details on the financial guarantee insured portfolio. The Risk Management Group is primarily responsible for the development, implementation and oversight of loss mitigation strategies, surveillance and remediation of the insured financial guarantee portfolio (including through the pursuit of recoveries in respect of paid claims and commutations of policies). Our ability to execute certain risk management activities may be limited by the restrictions set forth in the Settlement Agreement and the Stipulation and Order. See Note 1. Background and Business Description to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for further information. Ambac’s Risk Management Group ("RMG") has an organizational structure designed around four primary areas of focus: Surveillance, Risk Remediation, Credit Risk Management and Loss Reserving and Analytics. The Head of Risk Management reports directly to Ambac's Chief Executive Officer and regularly informs and updates the Audit Committees of the Boards of Directors of Ambac and Ambac Assurance with respect to risk-related topics in the insured portfolio. Surveillance This group's focus is on the early identification of potential stress or deterioration in connection with exposures in the insured portfolio and the related credit analysis associated with these and other insured portfolio exposures. Analysts in this group perform periodic credit reviews of insured exposures according to a schedule based on the risk profile of the guaranteed obligations or as necessitated by specific credit events or other macro-economic variables. Risk-adjusted surveillance strategies have been developed for each bond type with review periods and scope of review based upon each bond type’s risk profile. The risk profile is assessed regularly in response to our own experience and judgments or external factors such as the economic environment and industry trends. In general, surveillance activities are designed to detect deterioration in credit quality or changes in the economic, regulatory or political environment which could adversely impact the portfolio. Active surveillance enables analysts | Ambac Financial Group, Inc. 5 2017 FORM 10-K | to track single credit migration and industry credit and performance trends. The focus of a related credit review is to assess performance, identify credit trends and recommend appropriate credit classifications, ratings and changes to a transaction or bond type’s review period and surveillance requirements. Please refer to Note 2. Basis of Presentation and Significant Accounting Policies the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for further discussion of the various credit classifications. If a problem is detected, the Surveillance group will then work with the Risk Remediation group on a loss mitigation plan, as necessary. to Surveillance for collateral dependent transactions, including, but not limited to, residential mortgage-backed securities (“RMBS”), asset-backed securities (“ABS”) and student loan transactions, focuses on reviews of the underlying asset cash flows and, if applicable, the performance of servicers or collateral managers. Ambac Assurance generally receives periodic reporting of transaction performance from issuers or trustees. Surveillance analysts review these reports to monitor performance and, if necessary, seek legal advice to ensure that reporting and application of cash flows comply with transaction requirements. Risk Remediation This group’s focus is on risk remediation, loss mitigation and restructuring related to the insured portfolio of Ambac Assurance. Risk remediation helps to reduce exposure to credits that are developing, have the potential for future adverse development or are already adversely classified by, among other things, securing rights and remedies, both of which help to mitigate losses in the event of further deterioration or event of default, or, as available, working with an issuer to refinance or retire debt. Loss mitigation focuses on the analysis, implementation and execution of commutation and related claims reduction or defeasance strategies for policies with potential future claims. Loss mitigation prioritizes policies, or portions thereof, for commutation, refinancing or other claims reduction or defeasance strategies. Restructuring or workout is the focused and active process of minimizing claims and maximizing recoveries typically following an event of default. The emphasis on reducing risk is centered on reducing enterprise-wide exposure on a prioritized basis. For certain adversely classified, survey list and watch list credits, Risk Remediation analysts will develop and implement a remediation or loss mitigation plan that could include actions such as working with the issuer, trustee, bond counsel, servicer and other interested parties in an attempt to remediate the problem and minimize Ambac Assurance’s exposure to potential loss. Other actions could include working with bond holders and other economic stakeholders to negotiate, structure and execute solutions, such as commutations. Adversely classified, survey list and watch list credits are tracked closely by Surveillance analysts together with Risk Remediation analysts as part of the Risk Remediation process and discussed at regularly scheduled meetings with Credit Risk Management (see discussion following in “Credit Risk Management”) and the Risk Committee (see discussion following in "Risk Committee"). In some cases, Risk Remediation will engage restructuring or workout experts, attorneys and/or other consultants with appropriate expertise in the targeted loss mitigation area to assist management in examining the underlying contracts or collateral, providing industry specific advice and/or executing strategies. In Risk Remediation, we have established cross-functional teams in key areas of focus, comprised of personnel both within the RMG and in other departments, to target proactive mitigation and remediation of losses and potential future losses associated with certain credits and sectors in the insured portfolio. Examples of such efforts include teams of professionals focused on (i) the review and enforcement of contractual representations and warranties in RMBS policies, (ii) RMBS servicing and (iii) the analysis and prioritization of policies with projected claims or the potential for future material adverse development to target and execute risk reduction, restructuring and commutation strategies. Members of these cross- functional teams will often work with external experts in the pursuit of risk reduction efforts. For RMBS servicing, the team focuses on servicer oversight and remediation. Analysts monitor the performance of servicers through a combination of (i) regular reviews of servicer performance; (ii) compliance certificates received from servicer management; (iii) independent rating agency information; (iv) reviews of servicer financial information; and (v) onsite servicing diligence. In some transactions, Ambac Assurance has the right to direct a transfer of RMBS and other servicing to an alternative servicer, upon certain events and subject to certain conditions. The decision to exercise this right is made based on various factors, including an assessment of the performance of the existing servicer and an assessment of whether a transfer of servicing may improve the performance of the collateral and reduce risk to Ambac Assurance. In the case of RMBS, Ambac Assurance has developed relationships with preferred servicers. Preferred servicers are selected through a formalized servicer review process that determines, among other key factors, the servicer’s ability and willingness to actively implement intense and proven loss mitigation activities on RMBS. Ambac Assurance may decide to exercise its rights to direct the transfer of servicing to a preferred servicer where such rights are available. The transfer of servicing is done with the objectives of (i) minimizing losses and distress levels by deploying targeted and enhanced loss mitigation programs; (ii) increasing visibility to Ambac Assurance of all servicing activities that impact overall deal performance; (iii) better aligning the servicer’s financial interest to the performance of the underlying deal through the utilization of performance based incentives; and (iv) reducing the risk of servicer underperformance due to servicer financial difficulty. Ambac Assurance believes that the loss mitigation activities, alignment of interests and close monitoring of servicers constitute credible means of minimizing risks and losses related to insured RMBS. A team of professionals is focused on recoveries from sponsors where Ambac Assurance believes material breaches of representations and warranties have occurred with respect to certain RMBS policies. The team engages with experienced consultants to perform the re-underwriting of loan files and consults with internal and external legal counsel with regard to loan putbacks as well as settlement and litigation strategies (refer to Note 2. Basis of Presentation and Significant Accounting Policies and Note 7. Financial Guarantee Insurance Contracts to the Consolidated | Ambac Financial Group, Inc. 6 2017 FORM 10-K | Financial Statements included in Part II, Item 8 in this Form 10-K for further discussion on this topic). Loss Reserving and Analytics ("LRA") LRA manages the quarterly loss reserving process for insured portfolio credits with projected policy claims. It also supports the development, operation and/or maintenance of various analytical models used in the loss reserving process as well as in other risk management functions. LRA works with Surveillance and Risk Remediation analysts responsible for a particular credit on the development, review and implementation of loss reserve scenarios and related analysis. Credit Risk Management ("CRM") CRM manages the decision process for all material matters that affect credit exposures within the insured portfolio. While not responsible for the credit analysis or execution of risk remediation or loss mitigation strategies, CRM provides a forum for independent assessments, reviews and approvals and drives consistency and timeliness. The scope of credit matters under the purview of CRM includes material amendments, waivers and consents, evaluation of remediation or loss mitigation plans, credit review scheduling, adverse credit classification and below investment grade rating designations, adversely classified credit reviews, sector reviews and overall portfolio review. The CRM decision process may involve a review of structural, legal, political and credit issues and also includes determining the proper level of approval, which varies based on the nature and materiality of the matter. In particular, formal plans or transactions that relate to risk remediation, loss mitigation or restructuring may also require Risk Committee approval. In addition, such plans or transactions that have material asset liquidity implications may also require ALCO approval. Control Rights In structured transactions, including structured public finance transactions, Ambac Assurance often is the control party as a result of insuring the transaction’s senior class or tranche. The control party may direct specified parties, usually the trustee, to take or not take certain actions following contractual defaults or trigger events. Control rights and the scope of direction and remedies vary considerably among our insured transactions. Because Ambac Assurance is party to and/or has certain rights in documents supporting transactions in the insured portfolio, Ambac Assurance frequently receives requests for amendments, waivers and consents (“AWCs”). Ambac Assurance’s risk management personnel review, analyze and process all requests for AWCs. As a part of the Segregated Account Rehabilitation Proceedings, the Rehabilitation Court enjoined certain actions by other parties to preserve Ambac Assurance’s control rights that could otherwise have lapsed or been compromised. By way of the Second Amended Plan of Rehabilitation and orders of the Rehabilitation Court, such protections are intended to be continued after the consummation of the Rehabilitation Exit Transactions (as defined in Note 1. Background and Business Description to the Consolidated Financial Statements, included in Part II, Item 8 in this Form 10-K). Adversely Classified Credit Review Credits that are either in default or have developed problems that eventually may lead to a default are tracked closely by the appropriate Surveillance and Risk Remediation teams and discussed at meetings with CRM. Adversely classified credit meetings include members of CRM, Surveillance, Risk Remediation and legal, as necessary. As part of the review, relevant information, along with the plan for corrective actions and a reassessment of the credit’s rating and credit classification is considered. Internal and/or external counsel generally review the documents underlying any problem credit and, if applicable, an analysis is prepared outlining Ambac Assurance’s rights and potential remedies, the duties of all parties involved and recommendations for corrective actions. Ambac Assurance also meets with relevant parties to the transaction as necessary. The review schedule for adversely classified credits is tailored to the remediation plan to track and prompt timely action and proper internal and external resourcing. A summary of developments regarding adversely classified credits and credit trends is also provided to the Credit Committee and Ambac’s and Ambac Assurance’s Board of Directors no less than quarterly. The insured portfolio contains exposures that are correlated and/or concentrated. Risk Management's surveillance includes identifying these types of exposures and identifying the risks that would or could trigger credit deterioration across the related exposures. When such risks occur, adverse credit classification may be warranted across many of the correlated and/or concentrated exposures. This is the case with student loans and RMBS, for example, which have several correlations including those associated with consumer lending, unemployment and home prices. In the past, our not-for-profit healthcare and our leveraged lease exposures experienced periods of stress arising from their concentrated and/or correlated risks, when there were major changes to healthcare reimbursement programs especially Medicaid, or significant weakness in consumer and business travel, in the case of the former and the latter, respectively. In the future, Ambac’s portfolio may be subject to similar credit deterioration arising from concentrated and/or correlated risks. Examples of other such risks that could impact our portfolio, and that our surveillance is designed to monitor include the impact of potential municipal bankruptcy contagion, the impact of tax reform on state and municipal bond issuers, or the impact of large scale domestic military cutbacks on our military housing portfolio or event risk such as natural disasters or other regional stresses. Most such risks cannot be predicted, and may materialize unexpectedly or develop rapidly. Although our surveillance allows us to connect the event and stress to the related exposures and assign an adverse credit classification and estimate losses across the affected credits, when necessary, we may not have adequate resources or contractual rights and remedies to mitigate loss arising from such risks. Amendment, Waiver and Consent Review / Approval The decision to approve or reject AWCs is based upon certain credit factors, such as the issuer’s ability to repay the bonds and the bond’s security features and structure. Members of Ambac Assurance’s Surveillance group review, analyze and process all requests for AWCs. All AWCs are initially screened for materiality in the Surveillance group. Non-material AWCs require the approval of at least the Surveillance analyst and the Surveillance manager. Material AWCs are within the purview of CRM, as noted above. For material AWCs, CRM has established minimum requirements that may be modified to require more or varied approvals depending upon the matter’s complexity, size or other characteristics. Ambac Assurance assigns internal credit ratings to individual exposures as part of the AWC process and at surveillance reviews. These internal credit ratings, which represent Ambac Assurance’s | Ambac Financial Group, Inc. 7 2017 FORM 10-K | independent parameters consistent with the exposure type. judgments, are based upon underlying credit Risk Committee The Risk Committee is a management committee that was established in the fourth quarter of 2017, as an interdisciplinary body of expertise from different parts of the Ambac Assurance to provide oversight of the key risk remediation, loss mitigation and restructuring issues (collectively "risk remediation") impacting the Company. The committee comprises the CEO, CFO, Head of Risk Management, as chair, General Counsel, and other key personnel from the Risk Management, Finance, Corporate Services and Legal departments. The mission of the committee is to: (i) to enhance, improve and standardize the key impact metrics, including economic, financial, and strategic, considered when making risk remediation decisions; (ii) to ensure a timely, rigorous and thorough approach to risk remediation at Ambac Assurance and the prudent and economically accretive use of capital in support of these activities; and (iii) to enhance enterprise-wide communication and cooperation in connection with these core Ambac Assurance business strategies. The purpose of the Risk Committee is to: (i) to review on a periodic basis changes to Ambac Assurance internal credit classifications and ratings of adversely classified credits, survey list credits, and watch list credits after the aforementioned CRM process; (ii) to review and approve risk remediation plans for adversely classified credits, survey list credits and watch list credits; (iii) to provide oversight and to review new risk remediation structures or approaches in connection with risk remediation plans or anticipated transactions; (iv) to review and approve proposed risk remediation transactions whereby Ambac Assurance is making an economic contribution; and (iv) other such risk remediation activities that Ambac Assurance may delegate to the Risk Committee. INSURANCE REGULATORY MATTERS AND OTHER RESTRICTIONS Regulatory Matters United States Ambac Assurance and Everspan are domiciled in the State of Wisconsin and, as such, are subject to the insurance laws and regulations of the State of Wisconsin (the “Wisconsin Insurance Laws”) and are regulated by the OCI. In addition, Ambac Assurance and Everspan are subject to the insurance laws and regulations of the other jurisdictions in which they are licensed. See Note 8. Insurance Regulatory Restrictions to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10- K for further information on regulatory restrictions. In addition, pursuant to the terms of the Settlement Agreement and the Stipulation and Order, Ambac Assurance must seek prior approval by OCI of certain corporate actions. The Settlement Agreement and Stipulation and Order include covenants which restrict the operations of Ambac Assurance. The Settlement Agreement will remain in force until the surplus notes issued thereunder have been redeemed, repurchased or repaid in full. The Stipulation and Order will remain in force for so long as OCI determines it to be necessary. Certain of the restrictions in the Settlement Agreement may be waived with the approval of the OCI and/or the requisite percentage of holders of surplus notes issued thereunder. United Kingdom The Prudential Regulatory Authority ("PRA") and Financial Conduct Authority ("FCA") (and their predecessor regulator the Financial Services Authority (“FSA”)) have exercised significant oversight of Ambac UK since 2008, after Ambac, Ambac Assurance and Ambac UK began experiencing financial stress. In 2009, Ambac UK’s license to write new business was curtailed by the FSA and the insurance license was limited to undertaking only run-off related activity. As such, Ambac UK is authorized to run- off its insurance portfolio in the United Kingdom, and to do the same through a branch in Milan, Italy, and a number of other EU countries. EU legislation has allowed Ambac UK to conduct business in EU states other than the United Kingdom through a “passporting” arrangement, which eliminates the necessity of additional those other EU jurisdictions. See Note 8. Insurance Regulatory Restrictions to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for further information on regulatory restrictions. licensing or authorization in Regulations over change in control Under Wisconsin law applicable to insurance holding companies, any acquisition of control of Ambac, and any other direct or indirect control of Ambac Assurance and Everspan, requires the prior approval of the OCI. “Control” is defined as the direct or indirect power to direct or cause the direction of the management and policies of a person. Any purchaser of 10% or more of the outstanding voting stock of a corporation is presumed to have acquired control of that corporation and its subsidiaries unless the OCI, upon application, determines otherwise. For purposes of this test, Ambac believes that a holder of common stock having the right to cast 10% or more of the votes which may be cast by the holders of all shares of common stock of Ambac would be deemed to have control of Ambac Assurance and Everspan within the meaning of the Wisconsin Insurance Laws. The United Kingdom has similar requirements applicable in respect of Ambac, as the ultimate holding company of Ambac UK. Common Stock Restrictions Ambac’s Amended and Restated Certificate of Incorporation limits voting and transfer rights of stockholders in significant ways. Article IV contains voting restrictions applicable to any person owning at least 10% of Ambac’s common stock so that such person (including any group consisting of such person and any other person with whom such person or any affiliate or associate of such person has any agreement, contract, arrangement or understanding with respect to acquiring, voting, holding or disposing of Ambac’s common stock) shall not be entitled to cast votes in excess of one vote less than 10% of the votes entitled to be cast by all common stock holders, except as otherwise approved by OCI. There are substantial restrictions on the ability to transfer Ambac’s common stock set forth in Article XII of Ambac’s Amended and Restated Certificate of Incorporation. In order to preserve certain tax benefits, subject to limited exceptions, any attempted transfer of common stock shall be prohibited and void to the extent that, as a result of such transfer (or any series of transfers of which such transfer is a part), either (i) any person or group of persons shall become a holder of 5% or more of the Company’s common stock or (ii) the percentage stock ownership interest in Ambac of any holder of 5% or more of the Company’s common stock shall be increased (a “Prohibited Transfer”). These restrictions shall not apply to an attempted transfer if the transferor or the transferee | Ambac Financial Group, Inc. 8 2017 FORM 10-K | obtains the written approval of Ambac’s Board of Directors to such transfer. A purported transferee of a Prohibited Transfer shall not be recognized as a stockholder of Ambac for any purpose whatsoever in respect of the securities which are the subject of the Prohibited Transfer (the “Excess Securities”). Until the Excess Securities are acquired by another person in a transfer that is not a Prohibited Transfer, the purported transferee of a Prohibited Transfer shall not be entitled with respect to such Excess Securities to any rights of stockholders of Ambac, including, without limitation, the right to vote such Excess Securities and to receive dividends or distributions, whether liquidating or otherwise, in respect thereof, if any. Once the Excess Securities have been acquired in a transfer that is not a Prohibited Transfer, the securities shall cease to be Excess Securities. If the Board determines that a transfer of securities constitutes a Prohibited Transfer then, upon written demand by Ambac, the purported transferee shall transfer or cause to be transferred any certificate or other evidence of ownership of the Excess Securities within the purported transferee’s possession or control, together with any distributions paid by Ambac with respect to such Excess Securities, to an agent designated by Ambac. Such agent shall thereafter sell such Excess Securities and the proceeds of such sale shall be distributed as set forth in the Amended and Restated Certificate of Incorporation. If the purported transferee of a Prohibited Transfer has resold the Excess Securities before receiving such demand, such person shall be deemed to have sold the Excess Securities to Ambac’s agent and shall be required to transfer to such agent the proceeds of such sale, which shall be distributed as set forth in the Amended and Restated Certificate of Incorporation. Dividend Restrictions, Including Contractual Restrictions Due to contractual and regulatory restrictions, Ambac Assurance has been unable to pay common dividends to Ambac since 2008 and will be unable to pay common dividends in 2018 without certain approvals, including the prior consent of the OCI, which is unlikely. Ambac Assurance’s ability to pay dividends is further restricted by the Settlement Agreement, the Stipulation and Order and the terms of its Auction Market Preferred Shares ("AMPS"). See Note 8. Insurance Regulatory Restrictions to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10- K for further information on dividends. As a result of these restrictions, Ambac Assurance is not expected to pay dividends to Ambac for the foreseeable future. Ambac UK is not expected to pay any dividends to Ambac Assurance for the foreseeable future. While the UK insurance regulatory laws impose no statutory restrictions on an insurer’s ability to declare a dividend, the PRA’s and FCA’s capital requirements in practice act as a restriction on the payment of dividends, where a firm has a lower level of regulatory capital than its regulatory capital requirement as is the case for Ambac UK. Further, the FSA amended Ambac UK’s license in 2010 such that the PRA must specifically approve (“non-objection”) any transfer of value and/or assets from Ambac UK to Ambac Assurance or any other Ambac group company, other than in respect of certain disclosed contracts between the two parties (such as in respect of a management services agreement between Ambac Assurance and Ambac UK). Pursuant to the Settlement Agreement, Ambac Assurance may not make any “Restricted Payment” (which includes dividends from Ambac Assurance to Ambac) in excess of $5 million in the aggregate per annum, other than Restricted Payments from Ambac Assurance to Ambac in an amount up to $7.5 million per annum solely to pay operating expenses of Ambac. Concurrent with making any such Restricted Payment, a pro rata amount of Ambac Assurance's surplus notes (other than junior surplus notes) would also need to be redeemed at par. The Stipulation and Order requires OCI approval for the payment of any dividend or distribution on the common stock of Ambac Assurance. Under the terms of Ambac Assurance’s Auction Market Preferred Shares (“AMPS”), dividends may not be paid on the common stock of Ambac Assurance unless all accrued and unpaid dividends on the AMPS for the then current dividend period have been paid, provided, that dividends on the common stock may be made at all times for the purpose of, and only in such amounts as are necessary for, enabling Ambac (i) to service its indebtedness for borrowed money as such payments become due or (ii) to pay its operating expenses. If dividends are paid on the common stock as provided in the prior sentence, dividends on the AMPS become cumulative until the date that all accumulated and unpaid dividends have been paid on the AMPS. INVESTMENTS AND INVESTMENT POLICY As of December 31, 2017, the consolidated non-VIE investments of Ambac had an aggregate fair value of approximately $5.74 billion. Investments are managed both internally by officers of Ambac, who are experienced investment managers and by external investment managers. All investments are made in accordance with the general objectives, policies, and guidelines for investments reviewed or overseen by Ambac Assurance and Ambac UK’s respective Boards of Directors. These policies and guidelines include liquidity, credit quality, diversification and duration objectives and are periodically reviewed and revised as appropriate. Additionally, senior credit personnel monitor the portfolio on a continuous basis. Credit monitoring of the investment portfolio includes procedures on residential mortgage- backed securities consistent with those utilized to assess the risk of our insured RMBS exposures. As of December 31, 2017, the Ambac Assurance and Everspan non-VIE investment portfolio had an aggregate fair value of approximately $4.86 billion. Ambac Assurance’s and Everspan’s investment objectives are to achieve the highest risk-adjusted after- tax return on a diversified portfolio consistent with Ambac Assurance’s and Everspan’s risk tolerance while employing active asset/liability management practices to satisfy all operating and strategic liquidity needs. In addition to internal investment policies and guidelines, Ambac Assurance’s investment portfolio is subject to limits on the types and quality of investments imposed by applicable insurance laws and regulations, which may be waived by the applicable regulatory authority in certain instances. The Board of Directors of Ambac Assurance approves any changes to Ambac Assurance's investment policy. Ambac Assurance purchases Ambac Assurance insured securities given their relative risk/reward characteristics. As described in Note 1. Background and Business Description to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K, changes to Ambac Assurance’s investment policies are subject to approval by OCI pursuant to covenants made by Ambac Assurance in the Settlement | Ambac Financial Group, Inc. 9 2017 FORM 10-K | Agreement and Stipulation and Order. Such requirements could adversely impact the performance of the investment portfolio. As of December 31, 2017, the non-VIE Ambac UK investment portfolio had an aggregate fair value of approximately $0.70 billion. Ambac UK’s investment policy is designed with the primary objective of ensuring that Ambac UK is able to meet its financial obligations as they fall due, in particular with respect to policy holder claims. Ambac UK purchases Ambac UK insured securities given their relative risk/reward characteristics. Ambac UK’s investment portfolio is subject to internal investment guidelines and may be subject to limits on types and quality of investments imposed by its regulator. The Board of Directors of Ambac UK approves any changes or exceptions to Ambac UK’s investment policy. As of December 31, 2017, the non-VIE Ambac (parent company only) investment portfolio had an aggregate fair value of approximately $0.16 billion. The primary investment objective is to preserve capital for strategic uses while maximizing income. The investment portfolio is subject to internal investment guidelines. Such guidelines set forth minimum credit rating requirements and credit risk concentration limits. Additionally, as of December 31, 2017, this portfolio has $0.20 billion in surplus notes that were issued by Ambac Assurance or the Segregated Account which are eliminated in consolidation. The following table provide certain information concerning the consolidated investments of Ambac: 2017 2016 Investment Category ($ in millions) December 31, Carrying Value (2) Weighted Average Yield (1) Carrying Value (2) Weighted Average Yield (1) Municipal obligations $ Corporate securities Foreign obligations U.S. government obligations U.S. agency obligations Residential mortgage- backed securities Asset-backed securities Total long-term investments Short-term investments Other investments (3) 780 860 27 85 — 2,251 649 4,652 657 432 5.5 % $ 374 3.2 % 1.0 % 1.6 % — % 14.1 % 7.3 % 9.3 % 1.3 % — % 1,802 43 101 4 2,352 943 5,619 431 450 Total $ 5,741 8.3% $ 6,500 3.9 % 2.8 % 1.2 % 1.2 % 0.6 % 9.1 % 4.5 % 5.7 % 0.6 % — % 5.4% (1) Yields are stated on a pre-tax basis, based on average amortized cost for both long and short term investments. (2) Includes investments guaranteed by Ambac Assurance and Ambac UK. Refer to Note 10. Investments of the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for further discussion of Ambac insured securities held in the investment portfolio. (3) Other investments include equity interests in pooled investment funds which are classified as trading securities and Ambac's interests in an unconsolidated trust created in connection with its sale of Segregated Account junior surplus notes on August 28, 2014. Ambac's exposure to RMBS in its investment portfolios is further discussed in Part II, Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Balance Sheet” section below for a discussion of the fair value of mortgage and asset-backed securities by classification. EMPLOYEES As of December 31, 2017, Ambac had 113 employees in the United States and 11 employees in the UK. Ambac considers its employee relations to be satisfactory. Item 1A. Risk Factors References in the risk factors to “Ambac” are to Ambac Financial Group, Inc. References to “we,” “our,” “us” and “Company” are to Ambac and its subsidiaries, as the context requires. Capitalized terms used but not defined in this section shall have the meanings ascribed thereto in Part I, Item 1 in this Form 10-K or in Note 1. Background and Business Description or Note 14. Income Taxes to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K unless otherwise indicated. Certain of the risk factors described below refer to Secured Notes and Tier 2 Notes, which were issued in February 2018 in connection with the transactions described in Note 1. Background and Business Description and Note 17. Subsequent Events to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10- K. Our risk factors are organized in the following sections. Risks Related to Ambac Common Shares .................... Risks Related to Insured Portfolio Losses ................... Risks Related to Indebtedness...................................... Risks Related to Capital, Liquidity and Markets ......... Risks Related to the Company's Business.................... Risks Related to International Business ...................... Risks Related to Taxation............................................. Changes in Political or Economic Conditions ............ Risks Related to Strategic Plan.................................... 10 12 15 20 22 23 25 25 26 Risks Related to Ambac Common Shares Investments in Ambac's common stock are highly speculative and the price per share of Ambac's common stock may be subject to a high degree of volatility, including significant price declines. Ambac's common stock, which was issued pursuant to its Reorganization Plan, began trading on the NASDAQ Global Market on May 1, 2013. Although Ambac's common stock is listed on NASDAQ, there can be no assurance as to the liquidity of the trading market or the price at which such shares can be sold. The price of the shares may decline substantially in response to a number of events or circumstances, including but not limited to: • adverse developments in our financial condition or results of operations; • changes in the actual or perceived risk within our insured portfolio, particularly with regards to concentrations of credit risk, such as to Puerto Rico; • changes to regulatory status; | Ambac Financial Group, Inc. 10 2017 FORM 10-K | • changes in investors’ or analysts’ valuation measures for our stock; • market trends unrelated to our stock; • market and industry perception of our success, or lack thereof, in pursuing our business strategy; and • results and actions of other participants in our industry. In addition, the price of Ambac's shares may be affected by the additional risks described below, including risks associated with Ambac Assurance’s ability to deliver value to Ambac. Investments in Ambac's common stock should be considered highly speculative and may be subject to a high degree of volatility. Ambac may not be able to realize value from Ambac Assurance or generate earnings apart from Ambac Assurance. The value of Ambac's stock is dependent upon the residual value of its main operating subsidiary, Ambac Assurance; the receipt of payments to be made by Ambac Assurance pursuant to the Amended TSA and the intercompany Cost Allocation Agreement; the receipt of payments on the Owner Trust Certificate issued to Ambac by Corolla Trust (the "Owner Trust Certificate"); the receipt of payments on investments made on securities issued or insured by Ambac Assurance; the receipt of dividends from Ambac Assurance; and the receipt of payments on other investments. There can be no assurance that Ambac will be able to realize residual value in Ambac Assurance, which is in run-off. It is unclear whether Ambac Assurance will be able to satisfy all of its obligations to policyholders, holders of its surplus notes (including junior surplus notes) and holders of its preferred stock, even if Ambac Assurance is successful in achieving recoveries and mitigating losses. Our ability to achieve recoveries and mitigate losses is subject to significant risks and uncertainties, including as a result of varying potential perceptions of the value of Ambac Assurance’s guarantees and securities. Due to the above considerations, as well as applicable legal and contractual restrictions described elsewhere herein, it is highly unlikely that Ambac Assurance will be able to pay Ambac any dividends for the foreseeable future. Furthermore, the payments to be made to Ambac under the Amended TSA and the intercompany Cost Allocation Agreement are subject to contingencies that are difficult to predict, making the amount and timing, if any, of such payments uncertain. Payments to be made under the Amended TSA, in particular, depend on the generation of future taxable income by Ambac Assurance above certain thresholds. Ambac Assurance’s ability to generate taxable income above such thresholds is uncertain. Due to these factors, there can be no assurance as to the amounts that Ambac will receive from Ambac Assurance under the Amended TSA. Moreover, the Cost Allocation Agreement provides that Ambac Assurance's reimbursement of Ambac's operating expenses after 2017 is subject to the approval of OCI and limited to $4.0 million per annum. We can provide no assurance as to whether OCI will approve such reimbursement or any portion thereof. It is also uncertain whether and to what extent Ambac will realize value from the Owner Trust Certificate. The Owner Trust Certificate is subordinated to $299.2 million of senior secured notes issued by Corolla Trust. Such notes and the Owner Trust Certificate are collateralized by and payable solely from a $350.0 million face amount junior surplus note plus interest thereon. Ambac Assurance became the obligor under the junior surplus notes on February 12, 2018 pursuant to the Second Amended Plan of Rehabilitation. No payment of interest on or principal of a junior surplus note may be made until all existing and future indebtedness of Ambac Assurance, including senior ranking surplus notes, policy claims and claims having statutory priority, have been paid in full. All payments of principal and interest on junior surplus notes are subject to the prior approval of OCI. If OCI does not approve the payment of interest on junior surplus notes, such interest will accrue and compound annually until paid. Payments on the senior secured notes issued by Corolla Trust will only be made when and to the extent that Ambac Assurance makes payments on the junior surplus note held by Corolla Trust. The senior secured notes must be paid in full before any payments will be made on the Owner Trust Certificate. If Corolla Trust has failed to pay all interest and principal outstanding on the senior secured notes within three business days of August 28, 2039, the senior secured noteholders may also take possession of and sell the junior surplus note. If such a sale were to occur, it is uncertain whether and to what extent there would be any value for the Owner Trust Certificate after satisfaction of the senior secured notes. The value of Ambac's common stock may also depend upon the ability of Ambac to generate earnings apart from Ambac Assurance. As noted below, Ambac is selectively exploring potential business opportunities that, among other things, may permit utilization of Ambac’s net operating loss carry-forwards, but there are no assurances regarding its ability to find or execute such business opportunities or the prospects of any such opportunities. Future offerings of debt or equity securities that rank senior or pari-passu to Ambac's common stock may adversely affect the market price of its common stock. If Ambac decides to issue debt or additional equity securities in the future that rank senior or pari-passu to its common stock, it is likely that they will be governed by an indenture or other instrument containing covenants restricting Ambac's operating flexibility. Additionally, any convertible or exchangeable securities issued in the future may have rights, preferences and privileges more favorable than those of common stock and may result in dilution to owners of common stock. Because Ambac's decision to issue debt or equity securities in any future offering will depend on market conditions, it cannot predict or estimate the amount, timing or nature of future offerings. Holders of common stock bear the risk of future offerings reducing the market price of Ambac's common stock and diluting the value of their stock holdings in the Company. The issuance of new common stock may dilute current shareholder value or have adverse effects on the market price of Ambac's common stock. If Ambac raises capital through the issuance of additional shares of common stock, whether for select business transactions, general corporate purposes, or in exchange for other securities, the value of current shareholders’ interests may be diluted as Ambac is not required to offer any such shares to existing stockholders on a preemptive basis. Ambac cannot predict the effect, if any, of future sales of its common stock, or the availability of shares for future sales, on the | Ambac Financial Group, Inc. 11 2017 FORM 10-K | market price of its common stock. Sales of substantial amounts of common stock or the perception that such sales could occur may adversely affect the prevailing market price for its common stock. The occurrence of certain events could result in the initiation of rehabilitation proceedings against Ambac Assurance, with resulting adverse consequences to holders of our securities. Increased loss development in the insured portfolio of Ambac Assurance or significant losses or other events resulting from litigation against Ambac Assurance may prompt OCI to determine that it is in the best interests of policyholders to initiate rehabilitation proceedings with respect to Ambac Assurance, either preemptively or in response to any such event. A group of entities allowed to participate in the confirmation hearings for the Second Amended Plan of Rehabilitation for the Segregated Account has indicated that it would appeal the order approving the Second Amended Plan. We can provide no assurance that an appeal of the approval order will not be successful and result in the approval order being overturned or modified, or necessitate changes to the Second Amended Plan. Ambac, Ambac Assurance and their respective security holders would face substantial uncertainty and risk if the appeal is successful. Among other possibilities, Ambac Assurance may lose control rights in transactions, which would expose the Company to significantly increased risks and potential losses. Even if the Second Amended Plan of Rehabilitation and/or the related approval order of the Rehabilitation Court is not modified or overturned, there can be no assurance that any level of capital deemed sufficient by OCI to permit the conclusion of the Segregated Account rehabilitation will be sufficient to cover all future losses, whether currently anticipated or unanticipated. If, as a result of the occurrence of any such event(s), OCI decides to initiate rehabilitation proceedings with respect to Ambac Assurance, adverse consequences may result, including, without limitation and absent enforceable protective injunctive relief, the assertion of damages by counterparties (including mark-to-market claims with respect to insured transactions executed in ISDA format), the acceleration of losses based on early termination triggers and the loss of control rights in insured transactions. Any such consequences may reduce the residual value of Ambac Assurance. Additionally, the rehabilitator would assume control of all of Ambac Assurance’s assets and management of Ambac Assurance. In exercising control, the rehabilitator would act for the benefit of policyholders, and would not take into account the interests of our securityholders. Such actions may result in material adverse consequences for our securityholders. Risks Related to Insured Portfolio Losses Loss reserves may not be adequate to cover potential losses; changes in loss reserves may result in further volatility of net income and comprehensive income. Loss reserves are established when management has observed credit deterioration, in most cases, when the underlying credit is considered adversely classified. Loss reserves established with respect to our non-derivative financial guarantee insurance policies are based upon estimates and judgments by management, including estimates and judgments with respect to the probability of default, the severity of loss upon default, management’s ability to execute policy commutations, and estimated remediation recoveries for, among other things, breaches by RMBS issuers of representations and warranties. The objective of establishing loss reserve estimates is not to, and our loss reserves do not, reflect the worst possible outcome. While our reserving scenarios reflect a wide range of possible outcomes (on a probability weighted basis) reflecting the significant uncertainty regarding future developments and outcomes, our loss reserves may change materially based on future developments. As a result of inherent uncertainties in the estimates and judgments made to determine loss reserves, there can be no assurance that either the actual losses in our financial guarantee insurance portfolio will not exceed such reserves or that our reserves will not increase or decrease materially over time as circumstances, our assumptions, or our models change. Additionally, inherent in our estimates of loss severities and remediation recoveries is the assumption that Ambac Assurance will retain control rights in respect of our insured portfolio. However, according to the terms of relevant transaction documents, Ambac Assurance may lose control rights in many insured transactions if, among other things, Ambac Assurance is the subject of delinquency proceedings and/or other regulatory actions which could result from its deteriorated financial position. If Ambac Assurance loses control rights, its ability to mitigate loss severities and realize remediation recoveries will be compromised, and actual ultimate losses in its insured portfolio could exceed current loss reserves. The Second Amended Plan of Rehabilitation of the Segregated Account and related orders of the Rehabilitation Court seek to restrain actions adverse to Ambac Assurance based on a loss of control rights due to the rehabilitation of the Segregated Account or related events or circumstances. If the Second Amended Plan of Rehabilitation and such orders do not successfully preclude such actions, Ambac Assurance could lose its control rights with respect to certain policies. Some issuers of public finance obligations insured by Ambac Assurance are experiencing fiscal stress that could result in increased losses on those obligations or increased liquidity claims, including losses or claims resulting from payment defaults, Chapter 9 bankruptcy or other restructuring proceedings or loss of market access. Some issuers of public finance obligations insured by Ambac Assurance have reported or may report budget shortfalls, significantly underfunded pensions or other fiscal stresses that imperil their ability to pay debt service or will require them to significantly raise taxes and/or cut spending in order to satisfy their obligations. Government entities may also take other actions that may impact their own creditworthiness or the creditworthiness of related issuers. Some issuers of obligations insured by Ambac Assurance have declared a payment moratorium, defaulted or filed for bankruptcy or similar debt adjustment proceedings, raising concerns about their ultimate ability to service the debt insured by Ambac Assurance and Ambac Assurance's ability to recover claims paid in the future. If the issuers of the obligations in the public finance portfolio are unable to raise taxes, cut spending, or receive federal or state assistance, or if such issuers default or file for bankruptcy under Chapter 9 or for similar relief under other laws that allow for the adjustment of debts, Ambac Assurance may experience liquidity claims and/or ultimate losses on those obligations, which could adversely affect the Company's business, financial condition and results of operations. | Ambac Financial Group, Inc. 12 2017 FORM 10-K | Ambac Assurance insures obligations of Commonwealth of Puerto Rico, including its authorities and public corporations, that are either subject to a Title III bankruptcy protection proceeding under the Puerto Rico Oversight, Management and Stability Act ("PROMESA") or have otherwise suspended debt service payments. Ambac Assurance may be required to make significant amounts of policy payments over the next several years, the recoverability of which is subject to great uncertainty, which may lead to material permanent losses. While we believe our reserves are adequate to cover losses in the Puerto Rico insured portfolio, there can be no assurance that Ambac Assurance may not incur additional losses in the future, particularly given the developing economic, political and legal circumstances in Puerto Rico. Such losses may have a material adverse effect on Ambac Assurance's results of operation and financial condition. Ambac Assurance has exposure to the Commonwealth of Puerto Rico (the "Commonwealth"), including its authorities and public corporations. Each has its own credit risk profile attributable to discrete revenue sources, direct general obligation pledges and general obligation guarantees. Overall, Ambac Assurance has approximately $2.0 billion of net par exposure the Commonwealth and these instrumentalities. Components of the overall Puerto Rico net par outstanding include capital appreciation bonds that are reported at the par amount at the time of issuance of the related insurance policy as opposed to the current accreted value of the bond. The outstanding net insured amount including accretion on capital appreciation bonds is approximately $2.7 billion. Total net insured lifetime debt service (net par and interest) to the Commonwealth of Puerto Rico and its instrumentalities was approximately $9.5 billion at December 31, 2017. to As a result of the developments described in these Risk Factors and elsewhere in this 10-K (see Part II, Item 7, Management's Discussion and Analysis of Financial Condition and Results of Operations - Financial Guarantees in Force), the Commonwealth of Puerto Rico and certain of its instrumentalities will continue to default on debt service payments, including payments owed on bonds insured by Ambac Assurance. Ambac Assurance may be required to make significant amounts of policy payments over the next several years, the recoverability of which is subject to great uncertainty, which may lead to material permanent losses. Our exposure to Puerto Rico is impacted by the amount of monies available for debt service, which is in turn affected by variability in economic growth, tax revenues, essential services expense as well as federal funding of Commonwealth needs. In addition, our exposure to Puerto Rico is impacted by the significant damage to the Commonwealth that was inflicted by Hurricane Maria, which made landfall on September 20, 2017, as well as Hurricane Irma, which passed just north of the island on September 6, 2017. The longer term recovery of the economy of the Commonwealth and its essential infrastructure will likely be highly dependent on the amount, timing and effectiveness of Federal aid. There is historical precedent for meaningful Federal support following other natural disasters in the United States and its territories and, to date, some Federal aid measures have been approved and have already started to assist in the recovery. However, there can be no assurances as to the sufficiency or ultimate level of the aid and as to the effectiveness of the deployment of the aid in benefiting the long term recovery of economic activity in Puerto Rico. Substantial uncertainty also exists with respect to the ultimate outcome for creditors in Puerto Rico due to legislation enacted by the Commonwealth and the United States, including PROMESA, as well as actions taken in reliance on such laws, including Title III filings. Ambac Assurance is involved in multiple litigations relating to such actions and other issues and may not be successful in pursuing claims or protecting its interests. Ambac Assurance is also participating in a mediation process with respect to potential debt restructurings. Mediation may not be productive or may not resolve Ambac Assurance's claims in a manner that avoids significant losses. Given the numerous uncertainties existing with respect to the restructuring process and relevant litigations, no assurance can be given that ultimate debt service discounts will not be severe and cause Ambac to experience losses materially exceeding current reserves. It is possible that certain restructuring process solutions, together with associated legislation, budgetary, and/or public policy proposals could be adopted and could significantly or further impair our exposures. In addition, there are possible final legal determinations, including failing to recognize or properly differentiate legal structures and protections applicable to such exposures, that could result in losses exceeding our current reserves by a material amount and our loss reserves would need to be increased. In particular, in a Title III process, should court- approved plans of adjustment for the Commonwealth, COFINA, Puerto Rico Highways and Transportation Authority ("PRHTA"), or any other issuers of Ambac-insured debt that file for Title III protection contemplate discounts to debt service implied by, or even worse than, the Commonwealth’s Revised Fiscal and Economic Growth Plan ("Revised FEGP"), the Fiscal Plan Compliance Act be upheld, or Ambac receive unfavorable judgments in the litigations to which it is a party, Ambac’s financial condition could be materially adversely affected. It is also possible that economic or demographic outcomes may be as, or worse than, forecast under the Commonwealth’s Revised FEGP or under proposals or plans promulgated by the Commonwealth or its instrumentalities in or in connection with a Title III process or otherwise. Even a negotiated restructuring to which Ambac agrees as part of a Title VI, mediation or other process may involve material losses in excess of current reserves. While our reserving scenarios reflect a wide range of possible outcomes reflecting the significant uncertainty regarding future developments and outcomes, given our exposure to Puerto Rico and the economic, fiscal, legal and political uncertainties associated therewith as well as the uncertainties emanating from the damage caused by hurricanes Maria and Irma, our loss reserves may ultimately prove to be insufficient to cover our losses, potentially by a material amount, and may be subject to material volatility. Implementation of the H.R. 1 (commonly known as the Tax Cuts and Jobs Act) may negatively impact the economic recovery of Puerto Rico, which could result in higher loss severities or an extended moratorium on debt service owed on Ambac Assurance- insured bonds of Puerto Rico and its instrumentalities. The Tax Cuts and Jobs Act effectively treats Puerto Rico the same as it does any other foreign tax jurisdiction and otherwise makes it less attractive for U.S. taxpayers to move certain operations abroad by, among other things, imposing U.S. federal income tax on a current basis with respect to certain earnings of controlled foreign corporations. This may diminish the Commonwealth of Puerto Rico’s relative attractiveness as a location for foreign | Ambac Financial Group, Inc. 13 2017 FORM 10-K | activity of a U.S. multinational group, including those with manufacturing facilities or other business on the island. The legislation comes at a difficult time as the Commonwealth of Puerto Rico recovers from hurricanes Maria and Irma and a multi- year financial crisis. Consequently, the Tax Cuts and Jobs Act could have an adverse impact on the ongoing recovery of the Commonwealth of Puerto Rico by impeding much-needed economic growth, job growth, and revenue generation, which could potentially result in higher loss severities and/or an extended debt service moratorium for Puerto Rico creditors, including the Company. Implementation of the Tax Cuts and Jobs Act could have a negative impact on issuers of Ambac Assurance-insured municipal bonds. Under the Tax Cuts and Jobs Act individuals who itemize their deductions on their Federal income tax returns will be limited to $10,000 of deductions for state and local taxes paid in a given year. In states with high income tax rates, such as New York, Connecticut, New Jersey, Maryland, and California, there is a risk that municipal bond issuers could be impacted by lower tax revenues if there is significant out migration by residents to states or municipalities with lower tax rates. Lower tax revenues in these jurisdictions could lead to reduced financial flexibility, lower overall economic activity and increased credit risk and thereby potentially increasing risk to Ambac Assurance with respect to affected issuers with bonds insured by Ambac Assurance. the demand for municipal bond In addition, the Tax Cuts and Jobs Act reduces the maximum corporate federal income tax rate to 21% from 35%, which could investments by reduce corporations, such as life insurance companies, banks, and credit unions, which currently hold approximately 30% of all outstanding municipal bonds. The impact of reduced demand could result in higher borrowing costs for municipalities and/or reduced refinancing flexibility for issuers of municipal bonds, thereby potentially increasing risk to Ambac Assurance with respect to issuers with municipal bonds insured by Ambac Assurance. We are subject to credit risk and other risks in our insured portfolio, including related to RMBS and securities backed by student loans. We are also subject to risks associated with adverse selection as our insured portfolio runs off. Measures taken to reduce such risks may have an adverse effect on the Company's operating results or financial position. Performance of our insured transactions, including (but not limited to) RMBS transactions and those involving securities backed by student loans, can be adversely affected by general economic conditions, such as recession, rising unemployment rates, underemployment, home prices that decline or do not increase in the patterns assumed in our models, increasing foreclosure rates and unavailability of consumer credit, mortgage product attributes, such as interest rate adjustments and balloon payment obligations, borrower and/or originator fraud, mortgage and student loan servicer performance or underperformance and financial difficulty, such as risks related to whether the servicer may be required to delay the remittance of any cash collections held by it or received by it after the time it becomes subject to bankruptcy or insolvency proceedings. While further deterioration in the performance of consumer assets, including mortgage-related assets and student loans, may occur, the timing, extent and duration of any future deterioration of the credit markets is unknown, as is the impact on potential claim payments and ultimate losses on the securities within our portfolio. In addition, there can be no assurance that any governmental or private sector initiatives designed to address such credit deterioration in the markets will be successful or inure to the benefit of the transactions we insure. For example, any initiative which permits the discharge of student loan debt in bankruptcy may adversely affect our portfolio. Similarly, servicer settlements with governmental authorities regarding foreclosure or servicing irregularities are generally designed to protect borrowers and may increase losses on securities we insure. In particular, the student loan industry and, specifically, trusts with securities insured by Ambac Assurance have been subject to heightened Consumer Finance Protection Bureau (CFPB) scrutiny and enforcement action over servicing and collections practices and potential chain of title issues and, consequently, any settlements, orders, consents or penalties resulting from CFPB actions, or any failure on the part of servicers or other parties asserting claims against delinquent borrowers to establish title to the loans, could lead to increased losses on securities we insure. In addition, there can be no assurance that Ambac Assurance would be successful, or that it would not be delayed, in enforcing the subordination provisions, credit enhancements or other contractual provisions of the RMBS that Ambac Assurance insures. As the runoff of the insured portfolio continues, the proportion of exposures we rate as below investment grade relative to the aggregate insured portfolio is likely to continue to increase, leaving the portfolio increasingly concentrated in higher risk exposures. This risk may result in greater volatility or have adverse effects on the Company's results from operations and on our financial condition. One of our primary goals is to create shareholder value through transaction terminations, policy commutations, settlements and restructurings that we believe will improve our risk profile. As we take such actions to reduce known and potential risks, such actions may negatively impact our operating results or financial position in one or more reporting periods. Our credit risk management policies and practices may not adequately identify significant risks. As described in Part I, Item 1, “Risk Management” in this Form 10-K, we have established risk management policies and practices which seek to mitigate our exposure to credit risk in our insured portfolio. Ongoing surveillance of credit risks in our insured portfolio is an important component of our risk management process. These policies and practices in the past have not insulated us from risks that were unforeseen and which had unanticipated loss severity, and such policies and practices may not do so in the future. There can be no assurance that these policies and practices will be adequate to avoid future losses. If we are not able to identify significant risks, we may not be able to timely remediate such risks, thereby increasing the amount of losses to which we are exposed. An inability to identify significant risks could also result in the failure to establish loss reserves that are sufficient in relation to such risks. We use analytical models to assist our projection of performance of our insured obligations and our investment portfolio but actual | Ambac Financial Group, Inc. 14 2017 FORM 10-K | results could differ materially from the model outputs and related analyses. We rely on internally and externally developed complex financial models, including default models related to RMBS and waterfall modeling provided by a nationally recognized vendor for RMBS and student loan exposures, to project performance of our insured obligations and similar securities in our investment portfolio. These models assume various conditions, probability scenarios, facts and circumstances, and there can be no assurance that such models accurately predict or measure the quantum of losses, loss reserves and timing of losses. Differences in the models that we employ, and/or uncertainties and/or flaws in these financial models and/or faulty assumptions inherent in these financial models and those determined by management, could lead to material changes in projected outcomes, and could include increased losses, loss reserves and/or other than temporary investment impairments. Moreover, modeled estimates of transaction performance depend in part on the interpretation of contracts and other bases of our legal rights. Such interpretations may prove to be incorrect or different interpretations may be employed by bond trustees and other transaction participants and, ultimately courts, which could lead to increased losses, loss reserves and/or investment impairments. Potential outcome of litigation relating to certain military housing credit exposures could adversely affect Ambac. Ambac Assurance is a party to a number of litigations relating to military housing securitization credits, where opposing parties contend that, among other things, Ambac Assurance has lost its control rights due to the existence of an “Ambac Default” caused by, among other things, the recently concluded Segregated Account rehabilitation. If Ambac Assurance is found to have lost control rights in these transactions, our ability to mitigate losses could be significantly compromised, and actual ultimate losses in these military housing transactions could exceed our current loss reserves. Moreover, an adverse outcome relating to the assertion of an “Ambac Default” could prompt other counterparties to make similar assertions, which would increase the risk of losing control rights in other transactions. Risks Related to Indebtedness The Secured Notes and Tier 2 Notes are secured primarily by potential recoveries on Ambac Assurance’s RMBS litigations and Ambac Assurance’s ability to obtain, and the timing of, any recovery on the RMBS litigations is subject to significant uncertainty. The Secured Notes and Tier 2 Notes are primarily secured by Ambac Assurance’s potential recoveries in respect of RMBS litigations. The RMBS litigations arise from Ambac Assurance’s claims of fraud and/or contractual breaches of representations and warranties with respect to certain residential mortgage-backed securities (“RMBS”) transactions insured by Ambac Assurance. These claims are based on, among other things, representations with respect to the characteristics of the securitized loans, the absence of borrower fraud in the underlying loan pools or other misconduct in the origination process, the compliance of loans with the prevailing underwriting policies, and compliance of the RMBS transaction counterparties with policies and procedures related to loan origination and securitization. In such cases, where contract claims are being pursued, the sponsor of the transaction is contractually obligated to repurchase, cure or substitute collateral for any loan that breaches the representations and warranties. However, generally the sponsors have not honored those obligations and have vigorously defended claims brought against them. The outcome of any litigation, including the RMBS litigations, is inherently unpredictable, including because of risks intrinsic in the adversarial nature of litigation. Subsequent court motions, appeals and rulings, some of which could relate to the transactions effectuated in connection with the conclusion of the Segregated Account rehabilitation, and the issuance of the Secured Notes or Tier 2 Notes, could delay or otherwise impact any recovery by Ambac Assurance. Moreover, rulings that may be adverse to Ambac Assurance (in any given RMBS litigation, as well as in related matters) could affect Ambac Assurance’s ability to pursue its claims or alter settlement dynamics with RMBS litigation counterparties. There can be no assurance that Ambac Assurance will be successful in prosecuting its claims in the RMBS litigations. Any litigation award or settlement amount is subject to counterparty credit risk, successor liability and other similar risks of recovery, including that the sponsor is unable to honor its contractual obligations or pay a judgment that Ambac Assurance may obtain in litigation. Some sponsors against which Ambac Assurance has claims have been acquired since the securitized loans were originated and their successors may decline to honor the sponsor’s obligations. Ambac Assurance may not be successful in enforcing its claims against any successor entity. There can be no assurance that Ambac Assurance will not have difficulties recovering any damages it may be owed or that it will recover all amounts to which it believes it is entitled or that any actual recoveries will not differ materially from the estimated representation and warranty recoveries the Company has accounted for in its financial statements. In addition, while a policy issued by Ambac Assurance guarantees all principal and interest payments (including mandatory prepayments) in respect of the Secured Notes as and when such payments become due and owing, such policy may not provide adequate assurance that payments of principal and interest in respect of the Secured Notes will be available in the event that Ambac Assurance’s financial condition, including its capital and liquidity, is materially adversely affected, including as a result of the failure to recover expected damages and, as a result, Ambac Assurance is unable to satisfy its policy obligations. In the event that Ambac Assurance is unable to satisfy its obligations under the Secured Notes policy, holders of the Secured Notes will have the right to foreclose on the securities constituting collateral for the Secured Notes and to sue Ambac Assurance for failure to make payments under the Secured Notes policy; however, there can be no assurance that the sale of the securities collateral will produce proceeds in an amount sufficient to pay any or all amounts due on the Secured Notes or that holders will be successful in any litigation seeking payments pursuant to the Secured Notes policy. Furthermore, holders of Secured Notes will not obtain any control, consultation or direction rights in respect of the RMBS litigations nor will holders be able to sell the Ambac Note or the right to receive proceeds in respect of the RMBS litigations without the prior consent of Ambac Assurance. Holders of Secured Notes and Tier 2 Notes will have no authority to make decisions in respect of the RMBS litigations, will need to rely on Ambac Assurance to pursue the RMBS litigations and | Ambac Financial Group, Inc. 15 2017 FORM 10-K | may only receive limited information concerning the RMBS litigations. All decisions concerning the conduct of the RMBS litigations, including as to strategy, settlement, pursuit and abandonment, will be made by Ambac Assurance, in consultation with its legal counsel. Holders of the Secured Notes and Tier 2 Notes will have no control over any decisions related to the RMBS litigations and will need to rely on Ambac Assurance to prosecute the underlying claims. If holders do not agree with decisions by Ambac Assurance with respect to the RMBS litigations, there is no recourse or ability to object to such decision. Additionally, Ambac Assurance’s ability to disclose potentially material details of the RMBS litigations on a regular basis may be limited by litigation strategy and the inherent nature and rules of judicial proceedings, including, among other things, proceedings and filings that are sealed by the court, matters involving attorney-client privilege and proceedings that are conducted on a confidential basis by agreement of the parties. The RMBS litigations could also be adversely affected if Ambac Assurance does not have sufficient resources to actively prosecute its claims or becomes subject to rehabilitation, liquidation, conservation or dissolution, or otherwise impaired by actions of OCI. While Ambac Assurance may pursue negotiated settlements of the RMBS litigations, the settlement discussions may not materialize, may ultimately fail, may cause delays or may result in settlements for less than the amount needed to pay the Secured Notes and Tier 2 Notes. Ambac Assurance may elect to engage in settlement negotiations with the defendants of the RMBS litigations and may decide to settle any or all of the RMBS litigations. The aggregate amount of settlements may be for an amount less than the amount necessary to pay the Secured Notes or less than the amount necessary to pay the Tier 2 Notes, which could have a material adverse effect on its financial condition or results of operations and make it more difficult for Ambac Assurance to repay the Ambac Note (and therefore make it more difficult for the issuer of the Secured Notes to repay the Secured Notes) and/or the Tier 2 Notes, on a timely basis or at all. Additionally, while Ambac Assurance may pursue settlement negotiations, there can be no assurance that any settlement negotiations will materialize or that any settlement agreement can be reached on terms acceptable to Ambac Assurance, or at all. If settlement discussions prior to trial fail with respect to a particular case, Ambac Assurance could incur greater expenses preparing for, and prosecuting, a trial in such case, and Ambac Assurance’s recovery would be subject to the additional risks inherent in any trial, which could adversely impact the value of the Secured Notes and Tier 2 Notes. Ambac Assurance may receive non-cash proceeds in respect of the RMBS litigations and may need to liquidate such proceeds for less than fair market value in order to make cash payments on the Ambac Note and/or the Tier 2 Notes. In connection with a settlement agreement or judgment, Ambac Assurance may receive non-cash proceeds or indirect proceeds, which are cash or non-cash proceeds received by others for the benefit of Ambac Assurance. Ambac Assurance, however, will be required to make payments on the Ambac Note, for the benefit of the holders of Secured Notes, and on the Tier 2 Notes, in cash. In the event that Ambac Assurance receives non-cash proceeds, Ambac Assurance may need to liquidate the non-cash proceeds if it does not have sufficient cash available to make a payment on the Ambac Note or the Tier 2 Notes on the applicable payment date. Market and economic conditions, governmental actions, the form of non-cash proceeds and other factors may cause substantial delays in the ability to liquidate any non-cash proceeds received. Ambac Assurance may not be able to liquidate any non-cash proceeds received for fair value or at all. If Ambac Assurance is unable to liquidate non-cash proceeds at their fair value, Ambac Assurance will still be required to make payments on the Ambac Note and Tier 2 Notes and any payment made that is greater than the amount received could have a material adverse effect on Ambac Assurance’s financial condition, including its capital and liquidity. If indirect proceeds are received, Ambac Assurance will also be required to make payments on the Ambac Note, for the benefit of the holders of Secured Notes, and on the Tier 2 Notes, in cash to the extent of the fair value to Ambac Assurance of the indirect proceeds. Any payments of cash on the Ambac Note and/or the Tier 2 Notes as the result of receiving indirect proceeds may have a material adverse effect on Ambac Assurance’s financial condition, including its capital and liquidity. There may not be sufficient collateral to pay any or all of the Secured Notes or Tier 2 Notes. In addition to Ambac Assurance’s right to representation and warranty recoveries in respect of the RMBS litigations, which is inherently uncertain, the Ambac Note is also secured by securities having an estimated fair market value of approximately $350 million. However, no appraisal of the value of the securities has been made and there can be no assurances that the fair market value of these securities will not decrease, including significantly. The value of the collateral in the event of liquidation will depend on market and economic conditions, the availability of buyers and other factors. Consequently, liquidating the securities collateral securing the Ambac Note may not produce proceeds in an amount sufficient to pay any or all amounts due on the Secured Notes. The estimated fair market value of the securities collateral securing the Ambac Note is subject to fluctuations based on factors that include, among others, the financial condition of participants in the financial guaranty insurance industry, the market for and availability of financial guaranty insurance, the ability to sell the collateral in an orderly sale, general economic conditions, the availability of buyers and other factors. The amount to be received upon a sale of the securities collateral would be dependent on numerous factors, including, but not limited to, the actual fair market value of the collateral at such time and the timing and the manner of the sale, and the amount Ambac Assurance receives may not equal or exceed the expected fair market value. Accordingly, there can be no assurance that the collateral can be sold in a short period of time or at all or at acceptable prices to Ambac Assurance. In the event of rehabilitation, liquidation, conservation, dissolution or other insolvency proceeding, Ambac Assurance cannot assure holders that the proceeds from any sale or liquidation of the securities collateral will be sufficient to pay any or all of Ambac Assurance’s obligations under the Ambac Note. In addition, in the event of any such proceeding, it is possible that the rehabilitator, trustee, or competing creditors will assert that the value of the collateral with respect to the Ambac Note or the Tier 2 Notes, including Ambac Assurance’s rights to recoveries in respect of the RMBS litigations, is less than the then-current | Ambac Financial Group, Inc. 16 2017 FORM 10-K | principal amount outstanding under the Ambac Note and the Secured Notes and/or the Tier 2 Notes on the date of the rehabilitation filing. Upon a finding by the court overseeing an Ambac Assurance rehabilitation that the Ambac Note and the Secured Notes and/or the Tier 2 Notes are under-collateralized, the claims in the rehabilitation proceeding with respect to the Ambac Note, the Secured Notes or the Tier 2 Notes may be bifurcated between a secured claim up to the value of the collateral and an unsecured claim for any deficiency. As a result, the claim of the holders of the Secured Notes or the Tier 2 Notes could be unsecured in whole or in part. The ability of the holders of the Secured Notes or Tier 2 Notes to realize upon any of the collateral securing the Ambac Note and the Secured Notes or Tier 2 Notes, as the case may be, may also be subject to bankruptcy and insolvency law limitations or similar limitations applicable in insurance company rehabilitation or liquidation proceedings. Rights of holders of the Secured Notes in the RMBS litigations and securities collateral and rights of holders of the Tier 2 Notes in the RMBS litigations may be adversely affected by the failure to perfect security interests in such collateral, and insolvency considerations with respect to Ambac Assurance may have an adverse effect on the ability of holders of the Secured Notes and Tier 2 Notes to receive payments on the Secured Notes or Tier 2 Notes, respectively. Applicable law provides that a security interest in certain tangible and intangible assets can only be properly perfected and its priority retained through certain actions undertaken by the secured party. There can be no assurance that the collateral agent in respect of the Secured Notes or Tier 2 Notes will have taken or will take all actions necessary to create properly perfected security interests in the proceeds from the RMBS litigations, which may result in the loss of the priority of the security interest in favor of the holders of the Secured Notes or the Tier 2 Notes, respectively, to which they would otherwise have been entitled. In particular, in the event of a rehabilitation, liquidation, conservation, dissolution or other insolvency proceeding with respect to Ambac Assurance, if the proceeds from the RMBS litigations received by Ambac Assurance are determined not to be under the control of the Secured Notes Issuer, a receiver or a creditor of Ambac Assurance may take the position that the Secured Notes Issuer’s security interest in such proceeds or a portion thereof is not perfected and therefore that such proceeds do not secure the Ambac Note. With respect to the Tier 2 Notes, in the event of a rehabilitation, liquidation, conservation, dissolution or other insolvency proceeding with respect to Ambac Assurance, if the proceeds from the RMBS litigations received by Ambac Assurance are determined not to be under the control of the collateral agent for the Tier 2 Notes, a receiver or a creditor of Ambac Assurance may take the position that such collateral agent’s security interest in such proceeds or a portion thereof is not perfected and therefore that such proceeds do not secure the Tier 2 Notes. Moreover, if the proceeds from the RMBS initiation of a rehabilitation, liquidation, conservation, dissolution or other insolvency proceeding with respect to Ambac Assurance, a receiver or a creditor of Ambac Assurance may take the position that such proceeds do not secure the Ambac Note or the Tier 2 Notes. If a court were to accept either of these positions, payments under the Ambac Note or Tier 2 Notes, as applicable, may be adversely affected and the Secured Notes or Tier 2 Notes, as the case may be, may become worthless. In addition, a rehabilitation, insolvency liquidation, conservation, dissolution or other litigations are received after the proceeding with respect to Ambac Assurance or the Secured Notes Issuer, as applicable, could lead to delays in payments due on the Secured Notes or Tier 2 Notes. Fraudulent transfer laws may permit a court to void the Ambac Note, and if that occurs, holders may not receive any payments on the Secured Notes. Fraudulent transfer and conveyance statutes may apply to the issuance of the Ambac Note. Under state fraudulent transfer or conveyance laws, which may vary from state to state, the Ambac Note could be voided as a fraudulent transfer or conveyance if Ambac Assurance (a) issued the Ambac Note with the intent to hinder, delay or defraud creditors or (b) received less than reasonably equivalent value or fair consideration in return for issuing the Ambac Note and, in the case of (b) only, one of the following is also true at the time thereof: • Ambac Assurance was insolvent or rendered insolvent by reason of the issuance of the Ambac Note; • the issuance of the Ambac Note left Ambac Assurance with an unreasonably small amount of capital or assets to carry on its business; or • Ambac Assurance intended to, or believed that it would, incur debts beyond its ability to pay as they mature. In addition, under Wisconsin insurance law, if the Ambac Note were issued within one year prior to the filing of a successful petition for rehabilitation or liquidation with respect to Ambac Assurance, the Ambac Note could be voided as a fraudulent transfer if Ambac Assurance issued the Ambac Note with the intent to hinder, delay or defraud creditors or received less than fair consideration in return for issuing the Ambac Note. As a general matter, value is given for a transfer or an obligation if, in exchange for the transfer or obligation, property is transferred or a valid antecedent debt is satisfied. Ambac Assurance cannot be certain as to the standards a court would use to determine whether or not Ambac Assurance was insolvent at the relevant time or, regardless of the standard that a court uses, whether the Secured Notes would be subordinated to Ambac Assurance’s other debt or policyholder claims. In general, however, a court would deem an entity insolvent if: • the sum of its debts, including contingent and unliquidated liabilities, was greater than the fair saleable value of all of its assets; • the present fair saleable value of its assets was less than the amount that would be required to pay its probable liability on its existing debts, including contingent liabilities, as they become absolute and mature; or • it could not pay its debts as they became due. If a court were to find that the issuance of the Ambac Note was a fraudulent transfer or conveyance, the court could void the payment obligations under the Ambac Note or could subordinate the Ambac Note to presently existing and future indebtedness or policy obligations of Ambac Assurance, and, as a result, holders may not receive any payments on the Secured Notes. | Ambac Financial Group, Inc. 17 2017 FORM 10-K | We have substantial indebtedness, which could adversely affect our financial condition, operational flexibility and our ability to obtain financing in the future. reasonable terms, or at all. Because of these and other factors beyond our control, we may be unable to pay the principal, interest or other amounts on our debt securities. We have a substantial amount of indebtedness. Our substantial level of indebtedness and other financial obligations as well as the performance of our insured portfolio, which is driven to an extent by events outside our control, increase the possibility that we may be unable to generate cash sufficient to pay, when due, the principal of, interest on, or other amounts due, in respect of our indebtedness. Our cash flow generation will depend on receipt of premiums, investment returns, and potential litigation recoveries, offset by policyholder claims, commutation payments and operating expenses, which will be subject to prevailing economic conditions and to financial, business and other factors, many of which are beyond its control and many of which are event-driven. Our substantial debt could also have other significant consequences. For example, it could: • increase our vulnerability to general adverse economic, competitive and industry conditions; • limit our ability to obtain additional financing in the future for working capital, capital expenditures, payment of policyholder claims, debt service requirements, acquisitions, general corporate purposes or other purposes on satisfactory terms or at all; • require us to dedicate a substantial portion of our cash flow from operations to the payment of our indebtedness, thereby reducing the funds available to us for operations and to fund the execution of our key strategies; • limit or restrict us from making strategic acquisitions or cause us to make non-strategic divestitures; • limit our ability or increase the costs to refinance indebtedness or repay such indebtedness due to ongoing interest accretion; • limit our ability to attract and retain key employees; and • limit our ability to enter into hedging transactions by reducing the number of counterparties with whom we can enter into such transactions, as well as the volume of those transactions. Despite current indebtedness levels, we and our subsidiaries may incur additional debt. While restrictive covenants in certain of our contracts currently provide limits on the amount of additional indebtedness Ambac Assurance may incur, we may obtain a waiver of those restrictions and incur additional indebtedness in the future. In addition, if Ambac incurred indebtedness, its ability to make scheduled payments on, or refinance, any such indebtedness may depend on the ability of our subsidiaries to make distributions or pay dividends, which in turn will depend on their future operating performance and contractual, legal and regulatory restrictions on the payment of distributions or dividends to which they may be subject. There can be no assurance that any such dividends or distributions would be made. This could further exacerbate the risks associated with our substantial leverage. If we cannot pay policyholder claims or service debt, the Company will have to take actions such as selling assets, restructuring or refinancing debt or seeking additional capital. Any of these remedies may not, if necessary, be effected on commercially Ambac Assurance has ongoing obligations related to surplus notes. Subject to approval by OCI, Ambac Assurance is required to make interest and principal (to the extent due) payments in cash on surplus notes on an annual basis. Ambac Assurance will be required to continue to make such payments, as and when approved by OCI, until all of the surplus notes mature, are repaid in full or are otherwise repurchased or retired. Ambac Assurance is also obligated to make payments on junior surplus notes, subject to OCI approval, after the senior surplus notes have been paid in full. Ambac Assurance may not have the ability to borrow, raise or otherwise have access to the funds necessary to pay such amounts when due. Surplus notes that were not exchanged and cancelled in the Exchange Offers may be acquired, redeemed or repaid on terms that may be viewed as more, or less, favorable than the terms of the consideration offered in the Exchange Offers. The Company may acquire, redeem or repay surplus notes that are not exchanged and cancelled in the Exchange Offers through open market purchases, privately negotiated transactions, other tender or exchange offers, redemptions, repayment at maturity or such other means as the Company deems appropriate, subject to the restrictions in the Settlement Agreement, Stipulation and Order and regulatory restrictions. Any such transactions will occur upon the terms and at the prices as the Company may determine in its sole discretion, which may be more or less favorable than the terms of the Exchange Offers, and could be for cash or other consideration. The Company may choose to pursue any or none of these alternatives, or combinations thereof, in the future. The surplus notes that remain outstanding following the consummation of the Exchange Offers are subordinated in right of payment to other claims, which could impair the right of the holders of such notes to receive interest and principal in the event of our insolvency or a similar occurrence. The surplus notes are unsecured obligations of Ambac Assurance and are expressly subordinated in right of payment to all of Ambac Assurance’s existing and future indebtedness (other than junior surplus notes) and policy claims. The surplus notes are subject to provisions of Wisconsin insurance law, which establishes the priority of distribution of claims from the estate of an insolvent insurance company. In the event that Ambac Assurance becomes subject to rehabilitation, liquidation, conservation or dissolution, holders of Ambac Assurance’s senior indebtedness and policy claims would be afforded a higher priority of distribution than holders of the surplus notes, and accordingly would have the right to be paid in full before holders of the surplus notes would be paid. Due to the nature of Ambac Assurance’s business, the amount of such higher priority claims in any rehabilitation, liquidation, conservation or dissolution is likely to be many times greater than any free and divisible surplus and it is likely that the holders of surplus notes would not recover any payment in such circumstances. In addition, claims of holders of the surplus notes will be subordinated to certain liabilities of the Company’s subsidiaries that are guaranteed by Ambac Assurance. | Ambac Financial Group, Inc. 18 2017 FORM 10-K | Ambac Assurance has not made regular interest or principal payments on surplus notes and may be unable to repay surplus notes in full at maturity or ever. Changes in inter-bank lending rate reporting practices or the method pursuant to which LIBOR rates are determined may adversely affect the value of LIBOR linked financial instruments. On November 20, 2014, Ambac Assurance, with the approval of OCI, redeemed surplus notes (other than junior surplus notes) in an amount equal to 26.67% of the principal amount of the surplus notes, plus accrued interest thereon, outstanding as of July 20, 2014, or approximately $396 million owned by third parties. However, except for a one-time payment of approximately six months of interest on the surplus notes (other than junior surplus notes) outstanding immediately after the Exchange Offers, no other interest or principal payments on the surplus notes have been approved or made to date, and Ambac Assurance may not receive approval from OCI to make payments as and when scheduled. As a result, holders of surplus notes may not be paid in full at maturity or ever. If OCI does not begin to approve regular payments on the surplus notes (other than junior surplus notes) within the next several years, the accretion of surplus notes may exceed our ability to ever repay in full the surplus notes. If Ambac Assurance becomes subject to a rehabilitation or liquidation under the Wisconsin insurance law, prior to the repayment of surplus notes, holders of surplus notes may not receive any recoveries on their investments. The effects of the amendments to the Settlement Agreement in the recently completed consent solicitation done in connection with the Exchange Offers could materially and adversely affect the credit risk inherent in, and significantly reduce protections afforded in, surplus notes not validly tendered and accepted or received as consideration pursuant to the Exchange Offers. including covenants Holders of surplus notes that were not tendered and accepted or were received as consideration pursuant to the Exchange Offers will be subject to the terms of the Settlement Agreement as modified, notwithstanding the fact that they did not deliver consents in the related consent solicitation. Certain restrictive covenants and other related provisions in the Settlement Agreement, regarding mergers and consolidations and the incurrence of indebtedness, have been modified or eliminated. As a result, holders of surplus notes no longer are entitled to the benefit of such provisions, which existed for the protection and benefit of holders of the surplus notes issued pursuant to the Settlement Agreement. The Settlement Agreement, as so amended, continues to govern the terms of all surplus notes issued thereunder that remain outstanding after the consummation of the Exchange Offers and Rehabilitation Exit Transactions. Accordingly, we may take certain actions in the future previously prohibited under the Settlement Agreement that could adversely affect the market prices of the surplus notes and otherwise increase the risks related to investments in the surplus notes. Increases in interest rates will increase the cost of servicing our debt could reduce our profitability and could result in a decrease in the value of the Secured Notes. The Secured Notes will bear interest at a variable rate. As a result, increases in interest rates will increase the cost of servicing the Secured Notes and could adversely affect our profitability and cash flows. Each one percentage point increase in interest rates would result in an $21.8 million increase in the annual cash interest payments due on the Secured Notes. Since February 1, 2014, the administration of LIBOR has been undertaken by ICE Benchmark Administration Limited (“IBA”), a subsidiary of Intercontinental Exchange Group. IBA, as the administrator of LIBOR, may make changes in methodology that could change the level of LIBOR, which in turn may adversely affect the value of financial instruments linked to LIBOR, including investment securities, swaps, and the Secured Notes. Since 2014, the IBA published multiple papers and other literature, including a “LIBOR Code of Conduct” relating to the setting of LIBOR. IBA has the power to alter, discontinue or suspend calculation or dissemination of LIBOR. On July 27, 2017, the U.K. Financial Conduct Authority announced that it will no longer persuade or compel banks to submit rates for the calculation of LIBOR rates after 2021 (the “July 27th Announcement”). The July 27th Announcement indicates that the continuation of LIBOR on the current basis cannot and will not be guaranteed after 2021. Consequently, at this time, it is not possible to predict whether and to what extent banks will continue to provide LIBOR submissions to the administrator of LIBOR or whether any additional reforms to LIBOR may be enacted in the United Kingdom or elsewhere. Similarly, it is not possible to predict what rate or rates may become accepted alternatives to LIBOR of the effect of any such alternatives on the value of LIBOR-linked securities. Any of the above changes or any other consequential changes to LIBOR or any alternative rate or benchmark as a result of any international, national, or other proposals for reform or other initiatives or investigations, or any further uncertainty in relation to the timing and manner of implementation of such changes, could have a material adverse effect on the value investments in our investment portfolio, swaps we use for hedging, and the Secured Notes. The amount of interest payable on the Secured Notes is set only once per interest period based on the three-month LIBOR rate on the applicable interest determination date, which rate may fluctuate substantially, and affect our ability to make payment on the Secured Notes. In the past, the level of the three-month LIBOR rate has experienced significant fluctuations. Historical levels, fluctuations and trends of the three-month LIBOR rate are not necessarily indicative of future levels. Any historical upward or downward trend in the three-month LIBOR rate is not an indication that the three-month LIBOR rate is more or less likely to increase or decrease at any time during an interest period for the Secured Notes, and historical levels of the three-month LIBOR rate should not be taken as an indication of its future performance. In addition, although the actual three-month LIBOR rate on an interest payment date or at other times during an interest period may be higher than the interest determination date, the only relevant date for purposes of determining the interest payable on the Secured Notes is the three- month LIBOR rate as of the respective interest determination date. Changes in the three-month LIBOR rates between interest determination dates will not affect the interest payable on the Secured Notes. As a result, changes in the three-month LIBOR rate may not result in a comparable change in the market value of the Secured Notes. three-month LIBOR rate on the applicable | Ambac Financial Group, Inc. 19 2017 FORM 10-K | The Secured Notes will bear interest at floating rates that could rise significantly, increasing Ambac Assurance’s interest expense and reducing its cash flow. If Ambac Assurance’s interest expense increases significantly, whether due to changes in LIBOR or increased borrowing costs when its refinances its current indebtedness, Ambac Assurance may not be able to make payments with respect to the Secured Notes or its other indebtedness. Ambac’s representation and warranty recovery may change over time, causing the value or the perceived value of the collateral securing the Secured Notes and Tier 2 Notes to change and any such changes may be material. Ambac reevaluates its estimated representation and warranty recoveries on a quarterly basis in connection with the preparation of its financial statements. See “Critical Accounting Policies and Estimates” in Part II, Item 7, Note 2. Basis of Presentation and Significant Accounting Policies and Note 7. Financial Guarantee Insurance Contracts to the Consolidated Financial Statements included in Part II, Item 8 of this Form 10-K for the fiscal year ended December 31, 2017. As a result of any reevaluation, the amount of Ambac’s representation and warranty recovery may be adjusted upward or downward due to, among other things, changes in management's view of the value of such recoveries and/or changes in the loss reserves related to such recoveries, and any adjustment may be material. Changes in representation and warranty recoveries may result in material changes in Ambac’s financial condition, including its capital and liquidity. In addition, any adjustment to representation and warranty recoveries may alter the value or the perceived value of the collateral securing the Secured Notes and Tier 2 Notes before payment on the Secured Notes or Tier 2 Notes is made in full, which may affect the value of, and trading market, if any, for, the Secured Notes or Tier 2 Notes. Management makes no the representation and warranty recoveries will not change, materially or at all, including in the near term. There can be no assurance that the apparent, or actual, value of the collateral securing the Secured Notes and Tier 2 Notes will equal or exceed the principal amount of the Secured Notes and Tier 2 Notes, respectively, at all times prior to maturity. representation that Risks Related to Capital, Liquidity and Markets Our inability to realize the expected recoveries included in our financial statements could adversely impact our liquidity, financial condition and results of operations and the value of the Secured Notes and Tier 2 Notes. As of December 31, 2017, we have estimated representation and warranty subrogation recoveries of $1,806.7 million (net of reinsurance) included in our financial statements. These recoveries are based on contractual claims arising from RMBS transactions that Ambac Assurance has insured, and represent a probability- weighted estimate of amounts we expect to recover under various possible scenarios, and do not represent the best or the worst possible outcomes with respect to any particular transaction or group of transactions. Our ability to recover these amounts and the time of the recoveries, if any, is subject to significant uncertainty, including risks inherent in litigation, collectability of such amounts from counterparties and/or their respective parents and affiliates, timing of receipt of any such recoveries, intervention by OCI, which could impede Ambac Assurance's ability to take the actions required to realize such recoveries, and uncertainties inherent in the assumptions used in estimating such recoveries. The amount of these subrogation recoveries is significant and if we were unable to recover such amounts, our stockholders’ equity as of December 31, 2017 would decrease from $1,645.3 million to $(161.4) million. We expect to recover material amounts of claims payments through remediation measures including the litigation described above as well as through cash flows in the securitization structures of transactions that Ambac Assurance insures. Realization of such expected recoveries is subject to various risks and uncertainties, including the rights and defenses of other parties with interests that conflict with Ambac Assurance's interests, the performance of the collateral and assets backing the obligations that Ambac Assurance insures, the performance of servicers involved in securitizations in which Ambac Assurance participates as insurer, and the effect the Segregated Account on Ambac Assurance's rights of rehabilitation. Additionally, our ability to realize recoveries in insured transactions may be impaired if orders of the Rehabilitation Court are not effective. Adverse developments with respect to such variables may cause our recoveries to fall below expectations, which could have a material adverse effect on our financial condition, including our capital and liquidity. Ambac’s estimate of RMBS litigation recoveries is subject to significant uncertainty and changes to the estimate could adversely impact its liquidity, financial condition and results of operations. For Ambac’s current RMBS cases for which it records a representation and warranty recovery in its financial statements, Ambac has been provided access to loan files for all loans in the relevant original pool and Ambac utilizes a “random sample” approach to estimate such recoveries. Ambac does not include estimates of damages attributed solely to fraudulent inducement claims in its estimate of representation and warranty recoveries. The amount estimated for purposes of Ambac’s representation and warranty recovery and the amount Ambac may ultimately receive is subject to significant uncertainty, including risks inherent in litigation, collectability of such amounts from counterparties and/ or their respective parents and affiliates, timing of receipt of any recoveries, intervention by the OCI, which could impede Ambac’s ability to take actions required to realize recoveries, and uncertainties inherent in the assumptions used in estimating any recoveries. In particular, Ambac’s assumptions regarding default rates of the loans and Ambac’s expectations with respect to the RMBS litigations have a significant impact on Ambac’s estimated representation and warranty recoveries. If these assumptions, expectations or estimates prove to be incorrect, or if an investor were to use different assumptions, expectations or estimates to predict recoveries, actual recoveries could differ materially from those estimated. Actual recovery will ultimately depend on future events and there can be no assurance that the assumed default rates or estimated RMBS litigations recoveries will not differ from actual events. Although Ambac believes that its methodology for extrapolating estimated recoveries is appropriate for evaluating the amount of potential recoveries, the methodologies Ambac uses to estimate expected losses in general and for any specific obligation in particular may not be similar to methodologies used by Ambac’s competitors, counterparties or other market participants. The determination of expected recovery is an inherently subjective | Ambac Financial Group, Inc. 20 2017 FORM 10-K | process involving numerous estimates, assumptions and judgments by management, using both internal and external data sources with regard to frequency, economic projections and other factors that affect credit performance. As a result, Ambac’s current estimates may not reflect Ambac’s future ultimate recovery and management makes no representation that the actual amount recovered, if any, will not differ materially from those estimated. The failure of Ambac’s actual recovery to meet or exceed its current estimate could result in a material adverse effect on Ambac’s financial condition, including its capital and liquidity. The surplus notes that remain outstanding and that were received by holders of Deferred Amounts from Ambac pursuant to the Second Amended Plan of Rehabilitation may not be fungible with the other surplus notes that remain outstanding following the consummation of the Exchange Offers. The surplus notes that were held by Supporting Holders but were not accepted for tender and that remain outstanding following the consummation of the Exchange Offers will accrue original issue discount (“OID”) in a manner that differs from the accrual of OID on the surplus notes received by holders of Deferred Amounts from Ambac pursuant to the Second Amended Plan of Rehabilitation, and, therefore, the surplus notes that were held by Supporting Holders but were not accepted for tender and that remain outstanding following the consummation of the Exchange Offers will not be fungible with the surplus notes received by holders of Deferred Amounts from AFG pursuant to the Second Amended Plan of Rehabilitation for U.S. federal income tax purposes. We may not be able to commute or reduce insured exposures. In pursuing the objective of improving its financial position, we are seeking to commute or reduce insured exposures. Transactions of this nature may not be feasible or economically viable. We cannot provide any assurance that any such transaction will be consummated in the future, or if it is, as to the timing, terms or conditions of any such transaction. Even if we consummate one or more such transactions, doing so may ultimately prove to be unsuccessful in creating value for any or all of our stakeholders and may adversely affect our operating results or financial position. Revenues and cash flow would be adversely impacted by a decline in realization of installment premiums. Due to the installment nature of a significant percentage of its premium income, Ambac Assurance has an embedded future revenue stream. The amount of installment premiums actually realized by Ambac Assurance could be reduced in the future due to factors such as early termination of insurance contracts, accelerated prepayments of underlying obligations or insufficiency of cash flows (by the premium paying entity). Additionally, the Segregated Account rehabilitation may result in the loss of installment premium income from such insured transactions if orders of the Rehabilitation Court are not effective. Such reductions would result in lower revenues. The change in composition of the securities in our investment portfolio exposes us to greater risk. Each of Ambac Assurance and Ambac Assurance UK Limited (“Ambac UK”) maintains a portion of its investment portfolio in lower-rated securities and/or “alternative assets” in order to increase the risk-adjusted return on its portfolio. Investments in lower-rated securities and “alternative assets” could expose Ambac and/or Ambac UK to greater earnings volatility, increased losses and decreased liquidity in the investment portfolio. We may have future capital needs and may not be able to obtain third-party financing or raise additional third-party capital on acceptable terms, or at all. An inability to obtain third-party debt financing or raise additional third-party capital, when required by us or when business conditions warrant, could have a material adverse effect on our business, financial condition and results of operations. The economic conditions affecting our industry, as well as other factors, may constrain our financing abilities. Our ability to secure third- party financing, if available, and to satisfy or refinance our financial obligations under indebtedness outstanding from time to time will depend upon regulatory conditions, our future operating performance, the availability of credit generally, economic conditions and financial, business and other factors, many of which are beyond our control. The market conditions and the macroeconomic conditions that affect our industry could have a material adverse effect on our ability to secure third-party financing on favorable terms, if at all. If third-party financing is not available when needed, or is available on unfavorable terms, we may be unable to take advantage of business opportunities, respond to competitive pressures or refinance our outstanding indebtedness, any of which could have a material adverse effect on our business, financial condition and results of operations. Ambac Assurance may in the future report a policyholders’ deficit or become insolvent. Our expected financial condition after the consummation of the Rehabilitation Exit Transactions is based on various assumptions concerning these transactions, including accounting and tax treatment. There can be no assurance that the assumptions will not differ materially from the ultimate results of such transactions and any differences may be material. In addition, while the Rehabilitation Exit Transactions and related transactions were designed to improve our financial condition, we will continue to be subject to risks and uncertainties that could materially affect our financial position. Therefore, even following consummation of the Rehabilitation Exit Transactions, circumstances may occur that would cause Ambac Assurance to report a policyholders’ deficit or not comply in the future with the statutory minimum policyholders’ surplus or undergo rehabilitation. In addition, Ambac Assurance may become insolvent in the future. OCI has prescribed or permitted additional accounting practices for Ambac Assurance and Everspan which are described in Note 8. Insurance Regulatory Restrictions to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K. If Ambac Assurance and Everspan are unable to utilize the permitted or prescribed practices, we may not comply with the statutory minimum policyholders’ surplus. The determination of the amount of other-than temporary impairments taken on our investments is highly subjective and could materially impact our results of operations or financial position. The determination of the amount of impairments on our investments varies by investment type and is based upon our periodic evaluation and assessment of known and inherent risks associated with the respective asset class. Such evaluations and | Ambac Financial Group, Inc. 21 2017 FORM 10-K | assessments are revised as conditions change and new information becomes available. Management updates its evaluations regularly and reflects changes in impairments as such evaluations are revised. There can be no assurance that our management has accurately assessed the level of impairments taken in our financial statements. Furthermore, additional impairments may need to be taken in the future. Historical trends may not be indicative of future impairments. In particular, we use externally developed financial models to project impairments with respect to RMBS held in our investment portfolio, including Ambac Assurance guaranteed RMBS. Differences in the models we employ and/or flaws in these models and/or faulty assumptions inherent in these models and those determined by management, could lead to increased impairments with respect to RMBS in our investment portfolio. Risks Related to the Financial and Credit Markets Changes in prevailing interest rate levels and market conditions could adversely impact our business results and prospects. Increases in prevailing interest rate levels can adversely affect the value of our investment portfolio and, therefore, our financial strength. In the event that investments must be sold in order to pay claims, to pay debt obligations, or to meet Financial Services liquidity needs due to contract terminations or collateral posting requirements, such investments would likely be sold at discounted prices. Additionally, increasing interest rates would have an adverse impact on our insured portfolio. For example, increasing interest rates could result in higher claim payments in respect of defaulted obligations that bear interest at floating rates of interest. Higher interest rates can also lead to increased credit stress on consumer asset-backed transactions (as the securitized assets supporting a portion of these exposures are floating rate consumer obligations), slower prepayment speeds and resulting “extension risk” relative to such consumer asset-backed transactions in our insured and investment portfolios, and decreased refinancing activity. Decreasing interest rates could result in early terminations of financial guarantee insurance policies in respect of which we are paid on an installment basis and do not receive a termination premium, thus reducing premium earned for these transactions. Decreases in prevailing interest rates may also limit growth of or reduce investment income and may adversely impact our interest rate swap portfolio. Our investment portfolio may also be adversely affected by credit rating downgrades, ABS and RMBS prepayment speeds, foreign exchange movements, spread volatility, and credit losses. We are subject to credit risk throughout our businesses, including large single risks, risk concentrations, correlated risks and reinsurance counterparty credit risk. We are exposed to the risk that issuers of debt which we have insured (or with respect to which we have written credit derivatives), issuers of debt which we hold in our investment portfolio, reinsurers and other contract counterparties (including derivative counterparties) may default their financial obligations, whether as the result of insolvency, lack of liquidity, operational failure, fraud or other reasons. These credit risks could cause increased losses and loss reserves, and/or estimates of credit impairments and mark-to-market losses with respect to credit derivatives in our financial guarantee business; and we could in experience losses and decreases in the value of our investment portfolio and, therefore, our financial strength. Such credit risks may be in the form of large single risk exposures to particular issuers, reinsurers or counterparties; losses caused by catastrophic events (including terrorist acts and natural disasters); losses caused by increases in municipal defaults; or losses in respect of different, but correlated, credit exposures. Risks Related to the Company's Business We are subject to the risk of litigation and regulatory inquiries or investigations, and the outcome of proceedings we are or may become involved in could have a material adverse effect on our business, operations, financial position, profitability or cash flows. Ambac Assurance is defending various lawsuits relating to its financial guarantee business. In addition, the Company from time to time receives various regulatory inquiries and requests for information. Please see Note 16. Commitments and Contingencies to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for information on these various proceedings. It is not possible to predict whether additional suits will be filed against Ambac, Ambac Assurance or one or more other subsidiaries or whether additional regulatory inquiries or requests for information will be made, and it is also not possible to predict the outcome of litigation, inquiries or requests for information. It is possible that there could be unfavorable outcomes in these or other proceedings. Management is unable to make a meaningful estimate of the amount or range of loss that could result from unfavorable outcomes or of the expenses that will be incurred in defending these lawsuits. Under some circumstances, adverse results in any such proceedings and/or the incurring of significant litigation expenses could be material to our business, operations, financial position, profitability or cash flows. The Settlement Agreement and Stipulation and Order contain restrictive covenants that may impair our ability to pursue our business strategies. Pursuant to the terms of the Settlement Agreement and Stipulation and Order, Ambac Assurance must seek prior approval by OCI of certain corporate actions. The Settlement Agreement and Stipulation and Order also include covenants which restrict the operations of Ambac Assurance which, in the case of the Settlement Agreement, remain in force until the surplus notes that were issued pursuant to the Settlement Agreement have been redeemed, repurchased or repaid in full, and, in the case of the Stipulation and Order, remain in place until the OCI decides to relax such restrictions. Certain of these restrictions may be waived with the approval of holders of the surplus notes issued pursuant to the Settlement Agreement and/or OCI. If we are unable to obtain the required consents under the Settlement Agreement and/or Stipulation and Order, we may not be able to execute our planned business strategies. OCI has certain enforcement rights with respect to the Settlement Agreement and Stipulation and Order. Disputes may arise over the interpretation of such agreements, the exercise or purported exercise of rights thereunder, or the performance of or failure or purported failure to perform obligations thereunder. Any such dispute could have material adverse effects on the Company, proceedings, whether administrative litigation, through | Ambac Financial Group, Inc. 22 2017 FORM 10-K | supervisory orders, failure to execute transactions sought by management, interference with corporate strategies, objectives or prerogatives, inefficient decision-making or execution, forced realignment of resources, to management, strained working relationships or otherwise. Such effects would also increase the risk that OCI would seek to initiate rehabilitation proceedings against Ambac Assurance. increased costs, distractions System security risks, data protection breaches and cyber-attacks could adversely affect our business and results of operations. We rely on our information technology systems for many enterprise-critical functions and a prolonged failure or interruption of these systems for any reason could cause significant disruption to our operations and have a material adverse effect on our business, financial condition and operating results. Our information technology and application systems may be vulnerable to threats from computer viruses, natural disasters, unauthorized access, cyber-attack and other similar disruptions. Computer hackers may be able to penetrate our network’s system security and misappropriate or compromise confidential information, create system disruptions or cause shutdowns. In addition to our own confidential information, we sometimes receive and are required to protect confidential information from third parties. To the extent any disruption or security breach results in a loss or damage to our data, or inappropriate disclosure of our confidential information or that of others, it could cause significant financial losses that are either not, or not fully, insured against, damage to our reputation, affect our relationships with third parties, lead to claims against us, result in regulatory action, or otherwise have a material adverse effect on our business or results of operations. In addition, we may be required to incur significant costs to mitigate the damage caused by any security breach, or to protect against future damage. Moreover, although we have disaster recovery and business continuity plans in place, we may not be able to adequately execute these plans in a timely fashion in the event of a disruption to our information technology and application systems. We may incur losses resulting from operational risk due to inadequate or failed internal processes, breakdown of settlement or communication systems, or from external events leading to disruption of our business. Events subject to operational risk include: • Internal Fraud-misappropriation of assets, intentional mismarking of positions • External Fraud-theft of information, third-party theft and forgery • Clients, Products, & Business Practice-improper trade, fiduciary breaches • Damage to Physical Assets • Business Disruption & System Failures-software failures, hardware failures; and • Execution, Delivery, & Process Management-data entry errors, accounting errors, failed mandatory reporting, settlement errors, and negligence. We may be adversely affected by failures in services or products provided by third parties. We have outsourced and may continue to outsource certain activities of our operations and business, and rely upon third-party vendors for other essential services and information, such as the provision of data used in setting loss reserves and the provision of risk management information and services. A material failure by an external service or information provider or a material defect in the products, services or information provided thereby could adversely affect our financial condition and results of operations. Our inability to attract and retain qualified executives and employees or the loss of any of these personnel could negatively impact our business. Our ability to execute on our business strategies depend on the retention and recruitment of qualified executives and other professionals. We rely substantially upon the services of our current executive team. In addition to these officers, we require key staff with risk mitigation, structured finance, insurance, credit, investment, accounting, finance, legal and technical skills. As a result of Ambac’s financial situation, there is a higher risk that executive officers and other key staff will leave the Company and replacements may not be motivated to join the Company. The loss of the services of members of our senior management team or our inability to hire and retain other talented personnel could delay or prevent us from succeeding in executing our strategies, which could further negatively impact our business. Our business could be negatively affected by actions of stakeholders whose interests may not be aligned with the broader interests of our stockholders. Ambac could be negatively affected as a result of actions by stakeholders whose interests may not be aligned with the broader interests of our stockholders, and responding to any such actions could be costly and time-consuming, disrupt operations and divert the attention of management and employees. Such activities could interfere with our ability to execute on our strategic plans. Risks Related to International Business Actions of the PRA and FCA could reduce the value of Ambac UK realizable by Ambac, which would adversely affect our securityholders. Ambac’s international business is operated by Ambac UK, which is regulated by the Prudential Regulation Authority (“PRA”) for prudential purposes and the Financial Conduct Authority (“FCA”) for conduct purposes. Under the Financial Services and Markets Act 2000 (“FSMA”), the PRA authorized Ambac UK to carry out financial guaranty insurance business in the UK and in the EU by way of the EU’s passporting regime (although this may change following Brexit), subject to the terms and conditions of the permission granted by the PRA and consented to by the FCA. However, the terms of Ambac UK’s regulatory authority are now restricted and Ambac UK is in run-off. Among other things, Ambac UK may not write any new business, and, with respect to any entity within the Ambac group of affiliates, commute, vary or terminate any existing financial guaranty policy, transfer certain assets, or pay dividends, without the prior approval of the PRA and FCA. The PRA and FCA act generally in the interests of Ambac UK policyholders and will not take into account the interests of securityholders of Ambac or Ambac Assurance when considering Accordingly, whether to provide any such approval. | Ambac Financial Group, Inc. 23 2017 FORM 10-K | determinations made by the PRA and FCA, in their capacity as Ambac UK’s regulator, could potentially result in adverse consequences for our securityholders and also reduce the value realizable by Ambac for Ambac UK. Regulatory uncertainty in relation to Ambac UK’s capital position could adversely affect the value of Ambac UK and affect our securityholders. Under applicable regulatory capital rules (“Solvency II”) Ambac UK remains significantly deficient in terms of capital. Ambac UK does not have a remedial plan other than to build its assets over time by on-going premium collections and earned investment income, as well as attempting to accelerate the run-off of its exposures. Further, there currently is no prospect of any capital support from the Ambac group of affiliates. The PRA is well aware of Ambac UK’s position and prospects. The PRA supervisory statement SS7/15 “Supervision of firms in difficulty or run-off” notes that “there are many circumstances in which a run-off strategy is in the best interests of policyholders” and notes that the PRA will review such firms and that they “may be permitted to continue activities necessary to carry out existing contracts in a manner, and for so long as, the PRA considers necessary in order to afford an appropriate degree of protection to policyholders”. AUK clearly falls into this category and therefore AUK’s current run off approach remains at all times subject to the PRA continuing to take no action in relation to its capital deficit and related Solvency II requirements. Alternative courses of action open to the PRA could adversely impact the anticipated run-off trajectory of Ambac UK and impact its value. Uncertainty regarding the economic impact of “Brexit” may have an adverse effect on Ambac’s insured international portfolio and the value of its foreign investments, both of which primarily reside with its subsidiary Ambac UK. In a non-binding referendum on the United Kingdom’s (“UK”) membership in the European Union (“EU”) in June 2016, a majority of those who voted approved the UK’s withdrawal from the EU. As a result of the referendum, in March 2017 the UK government gave the EU formal notification of its intent to leave with the expectation of formal withdraw two years later on 29 March 2019. Also in March 2017 the UK began initial (or phase one) negotiations with the EU regarding the terms of its departure (“Brexit”). On 8 December 2017 the EU and UK jointly announced, as set out in the Joint Report and Commission Communication of 8 December (“Joint Report”), that “sufficient progress” in phase one of the separation negotiations between the parties had been made to permit Brexit negotiations to move on to a more detailed phase two beginning in January 2018. The Joint Report is “a summary of the negotiations toward the legally binding withdrawal agreement” and is not itself legally binding but rather is a position paper setting out current agreement between the EU and the UK Government in three priority areas (citizens’ rights, the financial settlement and the Irish border). It also notes progress on other separation issues that have not yet been settled. Further details of the negotiations are provided in the House of Commons Briefing Paper Number 8183, 18 December 2017. While phase two Brexit separation discussions commenced in January 2018, these discussions will not include details of future, post-Brexit, trade relations. What is envisaged in the Joint Report next is “an agreement as early as possible in 2018 on transitional arrangements”. A further, separate, mandate for negotiations on a future post-transition trade framework is anticipated to begin by summer 2018. It is envisaged negotiations on the future trade framework will be concluded during the actual transitional phase, and will be influenced by the nature of the transitional arrangements agreed between the parties. If no transitional arrangements or new agreements are put into place, Brexit will mean that the activities in the EEA of UK passporting insurers will become unlawful on 29 March 2019. They will lose their legal authorization to serve clients who benefit from policies issued by a UK incorporated insurer under freedom of services passporting rights (and thereby maybe unable to legally collect premiums or pay claims) and if they have branches in EEA Member States they may be legally obliged to close them down and no longer be legally represented in those jurisdictions. In light of the materiality of the insurance sector to the UK economy and taking into account the significant amount of insurance business undertaken by EEA based insurers in the UK (which will be similarly affected) it is expected that transition arrangements will be put in place leading to insurers being able to continue to service EU policies beyond 29 March 2019 for at least a transition period and likely to their natural run-off in relation to policies written prior to 29 March 2019. However, at this stage there is no certainly that such a transition agreement can be reached between the EU and the UK Government. Ambac UK has seven policies in the EU written under current passporting rights the aggregate par value of which as at December 31, 2017 is $2.6 billion and as noted Ambac UK’s ability to service these contracts beyond 29 March 2019 is currently unclear until legally binding Brexit transition agreements are put into place prior to that date. In addition to the direct impact on insurers cited above, general uncertainty and the perceptions as to the ultimate impact of Brexit may adversely affect business activity, political stability and economic conditions in the UK, the Eurozone, the EU and elsewhere. The economic outlook could be further adversely affected by (i) the risk that one or more other EU countries could come under increasing pressure to leave the EU, (ii) the risk of a greater demand for independence by Scottish nationalists or for unification in Ireland and its impact on the United Kingdom, or (iii) the risk that the Euro as the single currency of the Eurozone could cease to exist. Any of these developments, or the perception that any of these developments are likely to occur, could have a material adverse effect on economic growth or business activity in the UK, the Eurozone, and/or the EU, and could result in the relocation of businesses, cause business interruptions, lead to economic recession or depression, and impact the stability of the financial markets, the availability of credit, political systems or financial institutions and the financial and monetary system. These economic conditions, particularly a recession or depression, may have a material adverse effect on Ambac’s international insured exposures particularly in the UK and Europe, the majority of which reside in Ambac UK. The creditworthiness of Ambac’s international insured exposures is subject to risks associated with, among other matters, lower asset values related to collateral backing transactions, depressed demand for services resulting in lower operating cash flows and reduced access to the capital | Ambac Financial Group, Inc. 24 2017 FORM 10-K | markets and other sources of financing or refinancing. In addition, such conditions may have a material adverse effect on the value and volatility of investments, including investments in UK property funds and equities that Ambac maintains, mainly through Ambac UK, in markets and currencies outside of the U.S. Collectively, these effects may have a negative impact on Ambac’s operating results and financial condition resulting from unexpected credit, investment and foreign exchange losses, volatile asset values, reduced liquidity and lost revenues. The uncertainty concerning the timing and terms of the Brexit could result in additional volatility in the equity, foreign exchange, real property, bond and other markets, which could adversely impact the UK economy and Ambac's results of operations and financial condition over the near and long term. Risks Related to Taxation Certain surplus notes or other obligations of Ambac Assurance may be characterized as equity of Ambac Assurance and as a result, Ambac Assurance may no longer be a member of the U.S. federal income tax consolidated group of which Ambac is the common parent. It is possible that certain surplus notes or other obligations of Ambac Assurance may be characterized as equity of Ambac Assurance for U.S. federal income tax purposes. If such surplus notes or other obligations are characterized as equity of Ambac Assurance that is taken into account for tax affiliation purposes and it is determined that such “equity” represented more than twenty percent of the total value of the stock of Ambac Assurance, Ambac Assurance may no longer be characterized as an includable corporation that is affiliated with Ambac. As a result, Ambac Assurance would no longer be characterized as a member of the U.S. federal income tax consolidated group of which Ambac is the common parent (the “Ambac Consolidated Group”) and Ambac Assurance would be required to file a separate consolidated tax return as the common parent of a new U.S. federal income tax consolidated group including Ambac Assurance as the new common parent and Ambac Assurance’s affiliated subsidiaries (the “Ambac Assurance Consolidated Tax Group”). To the extent Ambac Assurance is no longer a member of the Ambac Consolidated Group, Ambac Assurance’s NOLs (and certain other available tax attributes of Ambac Assurance and the other members of the Ambac Assurance Consolidated Tax Group) may no longer be available for use by the Ambac Assurance Consolidated Tax Group or any of the remaining members of the Ambac Assurance Consolidated Tax Group to reduce the U.S. federal income tax liabilities of the Ambac Assurance Consolidated Tax Group. Ambac, Ambac Assurance and their affiliates entered into a tax sharing agreement that would require Ambac to make certain tax elections that could mitigate the loss of NOLs and other tax attributes resulting from a deconsolidation of Ambac Assurance from the Ambac Consolidated Group. However, in the event of a deconsolidation, certain other benefits resulting from U.S. federal income tax consolidation may no longer be available to the Ambac Consolidated Group including certain favorable rules relating to transactions occurring between members of the Ambac Consolidated Group and members of the Ambac Assurance Consolidated Tax Group. If surplus notes or other obligations are characterized as equity of Ambac Assurance, the Ambac Assurance NOLs (and certain other tax attributes or tax benefits of the Ambac Consolidated Group) may be subject to limitation under Section 382 of the Tax Code. It is possible that certain surplus notes or other obligations may be characterized as equity of Ambac Assurance for U.S. federal income tax purposes. Such characterization could result in an “ownership change” of Ambac Assurance for purposes of Section 382 of the Tax Code. If such an ownership change were to occur, the value and amount of the Ambac Assurance NOLs would be substantially impaired, increasing the U.S. federal income tax liability of Ambac Assurance and materially reducing the value of Ambac Assurance’s stock owned by Ambac and the potential of future cash tolling or dividend payments from Ambac Assurance to Ambac. Deductions with respect to interest accruing on certain surplus notes may be eliminated or deferred until payment. To the extent certain surplus notes are characterized as equity for U.S. federal income tax purposes, accrued interest will not be deductible by Ambac Assurance. In addition, even if such surplus notes are characterized as debt for U.S. federal income tax purposes, the deduction of interest accruing on such surplus notes may be deferred until paid or eliminated in part depending upon (i) the terms of any deferral and payment provisions provided in such surplus notes, (ii) whether such surplus notes have “significant original issue discount,” and (iii) the yield to maturity of surplus notes. To the extent deductions with respect to interest are eliminated or deferred, the U.S. federal income tax of the members of the Ambac Consolidated Group or the members of the Ambac Assurance Consolidated Tax Group as the case may be, could be increased reducing the amount of cash available to pay its obligations. Changes in Political or Economic Conditions Implementation of the Tax Cuts and Jobs Act may have unexpected or adverse consequences for the Company and the value of its securities, particularly its common shares. On December 22, 2017, new tax legislation, the Tax Cuts and Jobs Act, was signed into law. Amongst other things, the Tax Cuts and Jobs Act implemented a sweeping overhaul of the U.S. tax laws applicable to corporations. A major provision of the Tax Cuts and Jobs Act was a reduction of the maximum corporate federal income tax rate to 21% from 35%, which resulted in the Company reducing the value of its net deferred tax asset, the impact of which was offset by a change in valuation allowance. As a result of the reduction in the corporate federal tax rate, the maximum amount of future tolling payments AFG may receive from Ambac Assurance, for tax years beginning with 2018, will also be reduced to approximately $56 million from $97 million. The Tax Cuts and Jobs Act also requires U.S. corporations to pay federal income tax on previously untaxed foreign earnings accumulated under legacy tax laws included in income, for the last taxable year beginning before January 1, 2018. As a result of this and other provisions in the Tax Cuts and Jobs Act, Ambac Assurance is expected to make additional tax payments in 2017 related to alternative minimum tax, which will be refundable in the future. The aforementioned as well as other provisions of the Tax Cuts and Jobs Act, such as those relating to the limitations on the deductibility of interest expense, the Global Tax Intangible Low Taxed Income and Base Erosion Anti-Abuse Tax, may also have an adverse impact on Ambac Assurance’s and/or AFG’s future financial condition and results of | Ambac Financial Group, Inc. 25 2017 FORM 10-K | operations that is difficult to predict at this time. Any adverse impact or the perception of an adverse impact may cause the value of Ambac Assurance’s and/or AFG’s securities, particularly its common shares, to decline. Risks Related to Strategic Plan Ambac is exploring select business opportunities which may permit utilization of Ambac’s net operating loss carry-forwards; however, such business opportunities may not be consummated, or if consummated, may not create value and may negatively impact our financial results. Ambac is exploring select business opportunities which may, amongst other things, permit utilization of its net operating loss carry-forwards. Such business opportunities, may involve the acquisition of assets or existing businesses or the development of businesses through new or existing subsidiaries. It is not possible at this time to predict the future prospects or other characteristics of any such business opportunities. Although we intend to conduct business, financial and legal due diligence in connection with the evaluation of any future business or acquisition opportunities, there can be no assurance our due diligence investigations will identify every matter that could have a material adverse effect on us. Efforts to pursue select business opportunities may be unsuccessful or require significant financial or other resources, which could have a negative impact on our financial condition. No assurance can be given that Ambac will be able to complete such business opportunities, generate any earnings or be able to successfully integrate any such business into our current operating structure. Moreover, Ambac’s ability to enter new businesses, including new businesses apart from Ambac Assurance, is also subject to significant doubt, given the financial condition of Ambac Assurance, the difficulty of leveraging or monetizing Ambac’s other assets, and the uncertainty of its ability to raise capital. Due to these factors, as well as those relating to Ambac Assurance as described in this Item 1A. Risk Factors, the value of our securities is speculative. Ambac’s current strategy and initiatives have been derived from, and created as a consequence of, the company’s current financial condition and circumstances. Should changes in Ambac’s circumstances or financial condition or in the political, economic and/or legal environment occur, there can be no assurances that all or any part of such strategy and/or initiatives will not be abandoned or amended to take account of such changes. Any such adjustment or abandonment may have an adverse effect on our securities. Ambac UK maintain an office in London, England, which consist of 3,514 square feet of office space, under a lease agreement that expires in October 2020. Additionally, Ambac maintains a disaster recovery site as part of its Disaster Recovery Plan, which is located approximately 100 miles from One State Street Plaza under a lease that expires in September 2019. This remote warm-back-up facility is complete with user work stations, phone system, data center, internet connectivity and a power generator, capable of serving the needs of the disaster recovery team to support all business operations. The plan, facility and systems are revised and upgraded where necessary, and user tested annually to confirm their readiness. Item 3. Legal Proceedings Refer to Notes to the Consolidated Financial Statements—Note 16. Commitments and Contingencies included in Part II, Item 8 in this Form 10-K for a discussion on legal proceedings against Ambac and its subsidiaries. Item 4. Mine Safety Disclosures Not applicable. PART II Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities Market Information The Company's common stock is listed on NASDAQ under the symbol “AMBC.” The high and low common stock prices per share were as follows: 2017 2016 High Low High Low Fourth quarter $ 17.79 $ 13.17 $ 27.25 $ 17.75 Third quarter Second quarter First quarter Holders 22.02 20.28 23.55 16.75 15.67 17.39 19.35 17.77 17.32 15.42 14.42 11.92 On February 27, 2018, there were 29 stockholders of record of Ambac’s common stock. Item 1B. Unresolved Staff Comments Dividends None. Item 2. Properties The executive office of Ambac is located at One State Street Plaza, New York, New York 10004, which consists of 103,484 square feet of office space, under lease agreements that expire in September 2019 (77,613 square feet) and December 2029 (25,871 square feet). The lease expiring in September 2019 has a provision that can extend the lease to December 2029. Ambac leases additional space outside of New York for its data center at a secure facility under a lease agreement that expires in March 2019. The Company did not pay cash dividends on its common stock during 2017 and 2016. Information concerning restrictions on the payment of dividends from Ambac's insurance subsidiaries is set forth in Item 1 above under the caption “Dividend Restrictions, Including Contractual Restrictions" and in Note 8. Insurance Regulatory Restrictions to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K. Purchases of Equity Securities By the Issuer and Affiliated Purchasers There were no repurchases of equity securities during the fourth quarter of 2017. Ambac does not have a stock repurchase program. | Ambac Financial Group, Inc. 26 2017 FORM 10-K | Warrants On June 30, 2015, the Board of Directors of Ambac authorized the establishment of a warrant repurchase program that permits the repurchase of up to $10 million of warrants. On November 3, 2016, the Board of Directors of Ambac authorized an additional $10 million to the warrant repurchase program. As of December 31, 2017, Ambac had repurchased 985,331 warrants at a cost of $8.1 million, leaving 4,053,670 warrants outstanding with an exercise price of $16.67 per share and expiration of April 30, 2023. The remaining aggregate authorization at December 31, 2017 is $11.9 million. Stock Performance Graph The following graph compares the performance of an investment in our common stock from the close of business on May 1, 2013, the date we emerged from bankruptcy through December 31, 2017, with the Russell 2000 Index and S&P Completion Index. The graph assumes $100 was invested on May 1, 2013 in our common Stock at the closing price of $20 per share and at the closing price for the Russell 2000 Index and S&P Completion Index. It also assumes that dividends (if any) were reinvested on the date of payment without payment of any commissions. The performance shown in the graph represents past performance and should not be considered an indication of future performance. Ambac Financial Group, Inc. Russell 2000 Index S&P Completion Index December 31, 5/1/13 2013 2014 2015 2016 2017 $100 $100 $100 $123 $127 $123 $123 $134 $130 $70 $127 $124 $113 $148 $142 $80 $167 $165 | Ambac Financial Group, Inc. 27 2017 FORM 10-K | Item 6. Selected Financial Data The following financial information for the five years ended December 31, 2017, has been derived from Ambac’s Consolidated Financial Statements. Following Ambac’s emergence from bankruptcy on May 1, 2013, the consolidated financial statements reflect the application of fresh start reporting (“Fresh Start”), incorporating, among other things, the discharge of debt obligations, issuance of new common stock and fair value adjustments. The effects of the reorganization and Fresh Start adjustments are recorded in Predecessor Ambac’s Consolidated Statement of Total Comprehensive Income for the period ended April 30, 2013. The financial results of the Company for the periods from May 1, 2013 are referred to as “Successor” and the financial results for the periods through April 30, 2013 are referred to as “Predecessor”. The 2013 Successor Period and the 2013 Predecessor Period are distinct reporting periods. As a result of the implementation of Fresh Start, results and balances are not comparable between Successor Ambac and Predecessor Ambac. This information should be read in conjunction with the Consolidated Financial Statements and related notes located in Part II, Item 8 in this Form 10-K. ($ in millions, except per share data) 2017 2016 2015 2014 Successor Ambac Year Ended December 31, Predecessor Ambac Period from Jan 1 through April 30, 2013 Period from May 1 through December 31, 2013 Total Comprehensive Income Highlights: Gross premiums written Net premiums earned Net investment income Other than temporary impairment losses Net realized investment gains Net change in fair value of credit derivatives Net gains (losses) on interest rate derivatives Net realized (losses) gains on extinguishment of debt Income (loss) on Variable Interest Entities ("VIEs") Losses and loss expenses (benefit) (1) Interest and underwriting and operating expenses Insurance intangible amortization Goodwill impairment Reorganization items Pre-tax income (loss) Net income (loss) attributable to Common Shareholders Total comprehensive income attributable to Ambac Financial Group, Inc. Net income (loss) per share: $ (14.3) $ (53.8) $ (37.6) $ (288.3) $ (80.3) $ 175.3 361.0 (20.2) 5.4 16.4 59.6 4.9 19.7 513.2 241.5 150.9 — — 197.3 313.4 (21.8) 39.3 20.1 (50.3) 4.8 (14.1) (11.5) 238.0 174.6 — — (284.3) 105.0 (328.7) (335.4) 74.8 20.6 312.6 266.3 (25.7) 53.5 41.7 (42.5) 0.1 31.6 (768.7) 219.2 169.6 514.5 — 510.1 493.4 288.3 246.4 300.9 (25.8) 58.8 23.9 (181.1) (74.7) (32.2) (545.6) 229.0 151.8 — 0.2 493.3 484.1 692.7 213.5 146.4 (46.8) 4.5 192.9 114.8 — (48.6) (185.1) 153.7 99.7 — 0.5 512.3 505.2 516.9 (14.1) 130.0 116.7 (0.5) 53.3 (60.4) (33.7) — 426.6 (38.1) 75.6 — — (2,745.2) 3,348.0 3,349.0 3,523.9 Basic Diluted $ $ (7.25) $ (7.25) $ 1.66 1.64 $ $ 10.92 10.72 $ $ 10.73 10.31 $ $ 11.23 10.91 $ $ 11.07 11.07 (1) Ambac records the impact of estimated recoveries related to securitized loans in RMBS transactions that breached certain representations and warranties within losses and loss expenses (benefit). The expense (benefit) associated with changes to our estimated recoveries for the years ended December 31, 2017, 2016, 2015 and 2014, the eight months ended December 31, 2013 and the four months ended April 30, 2013 were $72.0 million, $(71.4) million, $(303.6) million, $(481.7) million, $199.4 million, and $(61.6) million, respectively. | Ambac Financial Group, Inc. 28 2017 FORM 10-K | ($ in millions) December 31 Balance Sheet Highlights: 2017 2016 2015 2014 2013 Total non-variable interest entity investments $ 5,740.8 $ 6,500.2 $ 5,644.7 $ 5,507.0 $ 6,523.7 Cash and cash equivalents Premium receivable Insurance intangible asset Goodwill Subrogation recoverable (1) Deferred ceded premium Total VIE assets Total assets Unearned premiums Losses and loss expense reserve (1) Obligations under investment agreements Long-term debt (2) Derivative liabilities Total VIE liabilities Total liabilities Total stockholders’ equity 623.7 586.3 847.0 — 631.2 52.2 14,500.5 23,192.4 783.2 4,745.0 — 991.7 82.8 14,366.4 21,547.1 1,645.3 91.0 661.3 962.1 — 684.7 69.6 13,367.8 22,635.7 967.3 4,380.8 82.4 1,114.4 319.3 13,235.4 20,657.7 1,978.0 35.7 831.6 1,212.1 — 1,229.3 96.8 14,288.5 23,728.1 1,280.3 4,088.1 100.4 1,125.0 353.4 14,259.8 21,769.7 1,958.3 73.9 1,000.6 1,410.9 514.5 953.3 123.3 15,126.1 25,159.9 1,673.8 4,752.0 160.1 971.1 406.9 15,085.7 23,486.1 1,673.7 77.4 1,453.0 1,598.0 514.5 498.5 145.5 15,988.7 27,092.5 2,255.7 5,968.7 359.1 963.2 253.9 15,872.8 26,114.1 978.4 Total liabilities and stockholders' equity $ 23,192.4 $ 22,635.7 $ 23,728.1 $ 25,159.9 $ 27,092.5 (1) Ambac records as a component of its loss reserves and subrogation recoverable, estimated recoveries related to securitized loans in RMBS transactions that breached certain representations and warranties. Ambac has recorded gross estimated recoveries of $1,834.4 million, $1,907.0 million, $2,829.6 million, $2,523.5 million and $2,206.6 million at December 31, 2017, 2016, 2015, 2014 and 2013, respectively. (2) Long-term debt represents surplus notes issued to third parties by Ambac Assurance and the Segregated Account and secured borrowing obligations. In 2014, Ambac sold a $350.0 million junior surplus note issued to it by the Segregated Account to a newly formed Trust in exchange for cash of $224.3 million and a subordinated owner trust certificate issued by the Trust. Long-term debt for all years excludes the portion of long-term debt associated with variable interest entities. In 2015, Ambac entered into a $146.0 million secured borrowing transaction. Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations This Management’s Discussion and Analysis of Financial Condition and Results of Operations (“MD&A”) contains certain financial measures, in particular the presentation of Adjusted Earnings and Adjusted Book Value, which are not presented in accordance with accounting principles generally accepted in the United States (“GAAP”). We are presenting these non-GAAP financial measures because they provide greater transparency and enhanced visibility into the underlying drivers of our business. We do not intend for these non-GAAP financial measures to be a substitute for any GAAP financial measures and they may differ from similar reporting provided by other companies. Readers of this Form 10-K should use these non-GAAP financial measures only in conjunction with the comparable GAAP financial measures. Adjusted Earnings and Adjusted Book Value are non-GAAP financial measures that adjust for the impact of certain non-recurring or non-economic GAAP accounting requirements and include certain items that the Company has or expects to realize in the future, but that are not reported under GAAP. We also provide reconciliations to the most directly comparable GAAP measures; Adjusted Earnings to Net income attributable to common stockholders and Adjusted Book Value to Total Ambac Financial Group, Inc. stockholders’ equity. COMPANY OVERVIEW See Note 1. Background and Business Description for a description of the Company and our key strategies to achieve our primary goal to maximize shareholder value. EXECUTIVE SUMMARY Ambac Assurance and Subsidiaries: A key strategy for Ambac is to increase the value of its investment in Ambac Assurance by actively managing its assets and liabilities. Asset management primarily entails maximizing the risk adjusted return on non-VIE invested assets and managing liquidity to help ensure resources are available to meet operational and strategic cash needs. These strategic cash needs include activities associated with Ambac's liability management and loss mitigation programs. Management evaluates the potential impact of loss mitigation and avoidance strategies in order to target and prioritize policies, or portions thereof, for commutation, refinancing, restructuring or other risk reduction or defeasance strategies. Asset Management: Investment portfolios are subject to internal investment guidelines, as well as limits on types and quality of investments imposed by applicable insurance laws and regulations. As part of its investment strategy, and in accordance with the aforementioned guidelines, Ambac Assurance and Ambac Assurance UK Limited ("Ambac UK"), purchase distressed Ambac-insured securities based on their relative risk/reward characteristics. The investment portfolios of Ambac Assurance and Ambac UK also hold fixed income securities and funds that include a variety of other assets including, but not limited to, corporate bonds, asset backed and mortgage backed securities, municipal bonds, high yield bonds, leveraged loans, equities, real estate, insurance-linked securities and hedge | Ambac Financial Group, Inc. 29 2017 FORM 10-K | funds. Refer to Note 10. Investments to the Consolidated Financial Statements, included in Part II, Item 8 in this Form 10-K for further details of fixed income investments by asset class. During the year ended December 31, 2017, Ambac (inclusive of its subsidiaries) acquired $815.2 million of distressed Ambac- insured securities, including $97.3 million of RMBS and $686.1 million of Puerto Rico securities. Future cash flows relating to those invested assets include the sum of (i) the bond’s intrinsic cash flows and (ii) the estimated Ambac claim payments. At December 31, 2017, Ambac owned $2,242.3 million Ambac- insured RMBS, which included approximately $1.6 billion, or 41% of the total Deferred Amounts (as defined in the Segregated Account Rehabilitation Plan) outstanding were attributable, and approximately 29% of PRIFA and 58% of COFINA Ambac- insured bonds. Subject to applicable internal and regulatory guidelines and other constraints, Ambac will continue to opportunistically purchase Ambac-insured securities. Liability and Insured Exposure Management: Ambac Assurance's Risk Management Group focuses on the analysis, implementation and execution of commutations, risk reduction or defeasance and loss recovery strategies. Analysts evaluate the estimated timing and severity of projected policy claims as well as the potential impact of loss mitigation or remediation strategies in order to target and prioritize policies, or portions thereof, for commutation, refinancing, restructuring or other risk reduction or defeasance strategies. For targeted policies, analysts will engage with bondholders, issuers and other economic stakeholders to negotiate, structure and execute such strategies. During the 2017, Ambac's successes included: • On March 25, 2017, Ambac UK agreed in principle to a confidential settlement of litigation brought by Ambac UK in the name of Ballantyne Re plc (“Ballantyne”) against J.P. Morgan Investment Management Inc. (“JPMIM”) relating to the management of Ballantyne’s investment accounts, which were funded with the proceeds of notes issued in 2006 in connection with a structured reinsurance transaction and guaranteed in part by Ambac UK. On April 11, 2017, Ambac UK, Ballantyne and JPMIM signed a settlement agreement. Pursuant to the settlement, Ballantyne received a payment in return for releases of all claims by Ballantyne and Ambac UK. Ambac realized a US GAAP benefit through losses and loss expenses of approximately $91.6 million in 2017 as a result of the settlement, which resulted from the reduction of loss and loss expense reserves previously established in relation to Ballantyne, and not from a direct cash payment to Ambac UK. • On June 27, 2017, Ambac Assurance entered into a termination agreement with various parties, including a special purpose entity Augusta Funding Limited IV ("Augusta"), in connection with the commutation of an interest rate swap between Augusta and Ambac Assurance's wholly-owned subsidiary, Ambac Financial Services ("AFS"). During the second quarter, AFS made net settlement payments of approximately $103.6 million, including $94.4 million under the termination agreement. At March 31, 2017, Ambac had recorded a mark-to-market liability under this swap transaction of $147.0 million (net of an Ambac Assurance CVA of $42.9 million), resulting in a gain of approximately $43.4 million during 2017. In July 2017, Augusta redeemed its outstanding Ambac Assurance-insured debt and Ambac recognized approximately $2.6 million in accelerated premiums in 2017 relating to this redemption. The Ambac-insured Augusta net par outstanding was $185 million at the time of redemption and was adversely classified. • Ambac U.K. worked to facilitate an international asset- backed issuer's refinancing of £188.1 million of insured debt and which paid Ambac UK a termination premium of £12.6 million, resulting in accelerated premiums earned of $11.2 million in 2017; • Ambac worked closely with servicers and owners of Master Servicing Rights to exercise clean-up calls on 20 RMBS transactions, resulting in a benefit in losses and loss expenses of $21.8 million and reducing adversely classified net par exposure by $422.5 million; • Ambac Assurance commuted its policy on a long time distressed municipality ($44.6 million of net par exposure); aided in the refinancing of more than 50% ($144.7 million of net par exposure) of its exposure to Chicago, IL Board of Education general obligation bonds, resulting in an aggregate losses and loss expenses benefit of $4.1 million; and negotiated with a distressed domestic asset-backed VIE that was previously consolidated by Ambac to settle all of their assets and refinance its Ambac-insured debt ($30.8 million of net par exposure). During 2017, Ambac Assurance purchased the remaining $4.0 million of unpaid accrued interest related to certain surplus notes that were previously repurchased under call options. Ambac recognized a realized gain on these purchases of $1.1 million in the Consolidated Statements of Total Comprehensive Income (Loss). On February 12, 2018, the Second Amended Plan of Rehabilitation of the Segregated Account became effective and Ambac and Ambac Assurance consummated a series of transactions that generally involved (i) the exchange of certain surplus notes held by holders of surplus notes that elected to participate in a voluntary exchange transaction and (ii) the satisfaction and discharge of all Deferred Amounts of the Segregated Account, in each case for an effective consideration package comprised of cash, new Secured Notes and certain existing surplus notes and (iii) the exit from rehabilitation of the Segregated Account (the “Rehabilitation Exit Transactions”). See Note 1. Background and Business Description to the Consolidated Financial Statements, included in Part II, Item 8 in this Form 10-K for details regarding the Rehabilitation Exit Transactions. The following table provides a comparison of total and adversely classified credits ("ACC") net par outstanding in the insured portfolio at December 31, 2017 and 2016. Net par exposures within the U.S. public finance market includes capital appreciation bonds which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bonds. | Ambac Financial Group, Inc. 30 2017 FORM 10-K | ($ in billions) December 31, 2017 2016 $ Variance % Variance Total ACC $ $ 62.7 14.1 $ $ 79.3 17.0 $ $ (16.6) (2.9) (21)% (17)% The overall reduction in total net par outstanding resulted from scheduled maturities, amortizations, commutations, refundings, refinancings and calls, including reductions as a result of the activities of Ambac and its subsidiaries as noted above. The decrease in adversely classified credit exposures are primarily due to (i) calls, refundings, and paydowns or negotiated refinancings and commutations with a large portion of the decrease related to residential mortgage-backed securities and (ii) the upgrade of several remediated public finance transactions, partially offset by (iii) the downgrades of a Military Housing transaction and an Italian sub-sovereign transaction. Although our insured portfolio generally performed satisfactorily in 2017, we continued to experience stress in certain sectors and insured exposures, most notably within our approximately $2.0 billion of exposure to Puerto Rico consisting of several different issuing entities (all adversely classified). Each Puerto Rico issuing entity has its own credit risk profile attributable to discreet revenue sources, direct general obligation pledges and/or general obligation guarantees. Refer to "Financial Guarantees in Force" below in this Management Discussion and Analysis regarding the different issuing entities that encompass Ambac's exposures to Puerto Rico. In 2017, Ambac established a new non-adversely classified credit category of watch list. Watch list credits are currently fully performing but demonstrate the potential for future material adverse development due to such factors as long-term uncertainty about a particular sector, a certain structural element related to the issuer or transaction, or overall financial and economic sustainability. Total net par exposures of watch list credits are $11.1 billion at December 31, 2017. Ambac: As of December 31, 2017 total cash and investments of Ambac were $368.2 million, which include the following: • Asset backed and short-term securities of $96.3 million • Ambac-insured securities with a fair value of $5.9 million • Ambac Assurance surplus notes with a fair value of $201.3 million, which are eliminated in consolidation • Residual equity interest in the Corolla Trust that was created in 2014 to monetize Ambac's ownership interest in junior surplus notes issued by the Segregated Account. Ambac carries this interest using the equity method. Additionally, at December 31, 2017 Ambac held $35.0 million par amount of the debt issued by this VIE. The total carrying value of Ambac's equity and debt interests in Corolla Trust was $64.7 million at December 31, 2017. Refer to Note 3. Special Purpose Entities, Including Variable Interest Entities to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K, for more information on the Corolla Trust. During 2017, Ambac purchased ($101.8 million) and exchanged Ambac-insured bonds (fair value of $79.3 million) to extinguish (on a consolidated basis) $108.1 million par of Ambac Assurance surplus notes and $39.1 million par of Segregated Account surplus notes. Ambac recognized $3.8 million of gains on the extinguishment of debt in the Consolidated Statements of Income (Loss) as a result of these transactions during the year ended December 31, 2017. As a result of positive taxable income at Ambac Assurance in 2016, Ambac received $28.7 million in tax tolling payments in May 2017. As a result of filing its 2016 tax return, Ambac received an additional $0.6 million of tolling payments in December 2017. For the year ended December 31, 2017, $30.5 million of tolling payments were accrued which are expected to be paid to Ambac no later than forty-five days after April 15, 2018. There are no assurances that Ambac Assurance will be able to generate taxable income and therefore make tolling payments to Ambac in the future, which may ultimately constrain Ambac's access to capital and liquidity to support it operations and strategic initiatives. Financial Statement Impacts of Foreign Currency: The impact of foreign currency as reported in Ambac's Consolidated Statement of Total Comprehensive Income for the year ended December 31, 2017 included the following: ($ in millions) Net income (1) $ Changes in other comprehensive income: Gain (losses) on foreign currency translation Unrealized gains (losses) on non-functional currency available-for-sale securities Total changes in other comprehensive income Impact on total comprehensive income (loss) $ 21.1 73.6 (19.7) 53.9 75.0 (1) A portion of Ambac UK's, and to a lesser extent Ambac Assurance's, assets and liabilities are denominated in currencies other than its functional currency and accordingly, we recognized net foreign currency transaction gains/(losses) as a result of changes to foreign currency rates through our Consolidated Statement of Total Comprehensive Income (Loss). Refer to Note 2. Basis of Presentation and Significant Accounting Policies to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for further details on transaction gains and losses. Future changes to currency rates may adversely affect our financial results. Refer to Part II, Item 7A "Quantitative and Qualitative Disclosures about Market Risk" for further information on the impact of future currency rate changes on Ambac's financial instruments. CRITICAL ACCOUNTING POLICIES AND ESTIMATES Ambac's Consolidated Financial Statements have been prepared in accordance with GAAP. This section highlights accounting estimates management views as critical because they require management to make difficult and subjective judgments regarding matters that are inherently uncertain and subject to change. These estimates are evaluated on an on-going basis based on historical developments, market conditions, industry trends and other information that is reasonable under the circumstances. There can be no assurance that actual results will conform to estimates and that reported results of operations will not be materially adversely affected by the need to make future accounting adjustments to reflect changes in these estimates from time to time. | Ambac Financial Group, Inc. 31 2017 FORM 10-K | Management has identified the following critical accounting policies and estimates: (i) valuation of loss and loss expense reserves, (ii) valuation of certain financial instruments and (iii) valuation of deferred tax assets. Management has discussed each of these critical accounting policies and estimates with the Audit Committee, including the reasons why they are considered critical and how current and anticipated future events impact those determinations. Additional information about these policies can be found in Note 2. Basis of Presentation and Significant Accounting Policies to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K. Valuation of Losses and Loss Expense Reserves: The loss and loss expense reserves ("loss reserves") discussed in this section relate only to Ambac’s non-derivative insurance policies issued to beneficiaries, including unconsolidated VIEs. Ambac's loss reserves include loss reserve components of an insurance policy, including unpaid claims and the present value ("PV") of expected net cash flows required to be paid under an insurance contract. Unpaid claims, which include accrued interest, represent claims that were not paid for policies allocated to the Segregated Account. The PV of expected net cash flows represents the PV of expected cash outflows less the PV of expected cash inflows discounted at a risk-free discount rate. While unpaid claims are known and therefore not a subjective estimate, expected future losses, net of expected future recoveries, are inherently uncertain. As such, the remaining discussion is limited to addressing expected future losses, net of expected future recoveries. The evaluation process for expected future losses is subject to certain estimates and judgments regarding the probability of default by the issuer of the insured security, probability of remediation and settlement outcomes (which may include commutation, litigation settlements, refinancings and/or other settlement outcomes), probability of a restructuring outcome (which may include payment moratoriums, debt haircuts and/or subsequent recoveries) and the expected loss severity of credits for each insurance contract. As the probability of default for an individual credit increases and/ or the severity of loss given a default increases, our loss reserve for that insured obligation will also increase. Political, economic, credit or other unforeseen events could have an adverse impact on default probabilities and loss severities. The loss reserves for many transactions are derived from the issuer’s creditworthiness. For public finance issuers, loss reserves will consider not only creditworthiness but also political dynamics and economic status and prospects. The loss reserves for other transactions which have no direct issuer support, such as most structured finance exposures, including RMBS and student loan exposures, are derived from the default activity and loss given default of underlying collateral supporting the transactions. In addition, many transactions have a combination of issuer/entity and collateral support. Loss reserves reflect our assessment of the transaction’s overall structure, support and expected performance. Loss reserve volatility will be a direct result of the credit performance of our insured portfolio, including the number, size, bond types and quality of credits included in our loss reserves as well as our ability to execute workout strategies and commutations. The number and severity of credits included in our loss reserves depend to a large extent on transaction specific attributes, but will generally increase during periods of economic stress and decline during periods of economic prosperity. Reinsurance contracts mitigate our loss reserve but since Ambac has little exposure ceded to reinsurers, the existing reinsurance contracts are unlikely to have a significant effect on loss reserve volatility. However, entrance into new reinsurance contracts may impact loss reserve volatility. Loss reserve volatility will also be materially impacted by changes in interest rates from period to period. The table below indicates the gross par outstanding and gross loss reserves (including loss expenses) related to policies in Ambac’s loss and loss expense reserves at December 31, 2017 and 2016: ($ in millions) December 31 RMBS Domestic Public Finance Student Loans Ambac UK All other credits Loss expenses Totals 2017 2016 Gross Par Outstanding(1)(2) Gross Loss and Loss Expense Reserves(1)(3)(4)(5) Gross Par Outstanding(1)(2) Gross Loss and Loss Expense Reserves(1)(3)(4)(5) $ $ 5,243 $ 4,265 701 941 537 — 2,598 $ 816 308 286 17 89 6,756 $ 4,410 728 939 567 — 2,394 547 279 388 13 75 11,687 $ 4,114 $ 13,400 $ 3,696 (1) Ceded par outstanding on policies with loss reserves and ceded loss and loss expense reserves are $590 and $41, respectively, at December 31, 2017 and $607 and $31, respectively at December 31, 2016. Ceded loss and loss expense reserves are included in Reinsurance recoverable on paid and unpaid losses. (2) Gross Par Outstanding includes capital appreciation bonds, which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bond. (3) Loss and Loss Expense reserves at December 31, 2017 of $4,114 are included in the balance sheet in the following line items: Loss and loss expense reserves: $4,745 and Subrogation recoverable: $631. Loss and Loss Expense reserves at December 31, 2016 of $3,696 are included in the balance sheet in the following line items: Loss and loss expense reserves: $4,381 and Subrogation recoverable: $685. (4) Included in Gross Loss and Loss Expense Reserves are unpaid claims of $3,867 and $3,656 at December 31, 2017 and 2016, respectively, related to policies allocated to the Segregated Account, inclusive of accrued interest payable on Deferred Amounts of $840 and $662, respectively. (5) Ambac records as a component of its loss and loss expense reserves, estimated recoveries related to securitized loans in RMBS transactions that breached certain representations and warranties. Ambac has recorded gross estimated recoveries of $1,834 and $1,907 at December 31, 2017 and 2016, respectively. | Ambac Financial Group, Inc. 32 2017 FORM 10-K | See Note 2. Basis of Presentation and Significant Accounting Policies for a description of the cash flow and statistical methodologies used to develop loss reserves. Most of our reserved credits with large loss reserves utilize the cash flow method of reserving. Alternative cash flow scenarios are developed to represent the range of possible outcomes and resultant future claims payments and timing. Scenarios and probabilities are adjusted regularly to reflect changes in status, outlook and our analysis and views. Significant judgment is used to develop the cash flow assumptions, and there can be no certainty that the modeled scenarios or probabilities will not deviate materially from ultimate outcomes. In some cases, such as RMBS and student loans, which are described more fully below, cash flow projections include the modeling of an issuer or transaction’s future revenues and expenses to determine the resources available to pay debt service on our insured obligations. In other cases, such as many public finance exposures including our Puerto Rico exposures, we do not specifically forecast resources available to pay debt service in the cash flow model itself. Rather, we consider the issuers’ overall ability and willingness to pay, including the existing fiscal, economic, legal and political framework. We then develop multiple scenarios where issuer debt service is paid, missed and/ or haircut with claims paid then modeled for any recovery amount and timing. In our experience, this has been an effective approach to loss reserving these types of credits, but there is no certainty our assumptions as to scenarios or probabilities will not be subject to material changes as developments occur or that this method will be as effective in the future as it has been in the past. In estimating loss reserves, we also incorporate scenarios which represent the potential outcome of remediation strategies. Remediation scenarios may include the following; (i) a potential refinancing of the transaction by the issuer; (ii) the issuer’s ability to redeem outstanding securities at a discount, thereby increasing the structure’s ability to absorb future losses; and (iii) our ability to terminate or restructure the policy in whole or in part (e.g., commutation). The remediation scenarios and the related probabilities of occurrence vary by policy depending on on-going and expected discussions and negotiations with issuers and/or investors. In addition to commutation negotiations that are underway with various counterparties in various forms, our reserve estimates may also include scenarios which incorporate our ability and/or expectation to commute additional exposure with other counterparties. RMBS Expected Loss Estimate Ambac insures RMBS transactions collateralized by first-lien mortgages. Ambac classifies its insured first-lien RMBS exposure principally into two broad credit risk classes: mid-prime (including Alt-A, interest only, and negative amortization) and sub-prime. Mid-prime loans were typically made to borrowers who had credit profiles stronger than sub-prime loans, but weaker than prime loans. Compared with mid-prime loans, sub-prime loans typically had higher loan-to-value ratios, reflecting the greater difficulty that sub-prime borrowers have in making down payments and the propensity of these borrowers to extract equity during refinancing. Ambac has also insured RMBS transactions collateralized predominantly by second-lien mortgage loans such as closed-end seconds and home equity lines of credit. A second-lien mortgage loan is a type of loan in which the borrower uses the equity in their home as collateral and the second-lien loan is subordinate to the first-lien loan outstanding on the home. Borrowers are obligated to make monthly payments on both their first and second-lien loans. If the borrower defaults on the payments due under these loans and the property is subsequently liquidated, the liquidation proceeds are first utilized to pay off the first-lien loan (as well as other costs) and any remaining funds are applied to pay off the second-lien loan. As a result of this subordinate position to the first-lien loan, second-lien loans carry a significantly higher severity in the event of a loss, approaching or exceeding 100%. Ambac primarily utilizes a statistically based cash flow model (“RMBS cash flow model”) to develop estimates of projected losses for both our first and second lien transactions. The RMBS cash flow model projects collateral performance utilizing: (i) the transaction’s underlying loans' characteristics and status, (ii) projected home price appreciation (“HPA”) and (iii) projected interest rates. We source HPA projections from a market accepted vendor and interest rate projections are developed from market sources. We generally utilize waterfall projections from a market accepted vendor which models securitization deal structures. In some cases, we may utilize an alternative waterfall structure when our legal and commercial analysis of the transaction’s payment structure differs from the vendor’s waterfall structure. We compare monthly claims submitted against the trustees’ reports, third-party provided waterfall projections and our understanding of the transactions’ structures to identify and resolve discrepancies. We also systematically review the vendor’s identify material published waterfall revisions discrepancies. Resolving discrepancies is challenging and may take place over an extended period of time. Moreover, transaction documents are subject to interpretation, and our interpretation or that of the vendor and as reflected in our loss reserves may prove to be incorrect and/or not consistent with trustees directing cash flows in the future. to further In our experience, market performance and model characteristics change and therefore need to be updated and reflected in our models through time. As such, we conduct regular reviews of current models, alternative models and the overall approach to loss estimation. In particular, the RMBS cash flow model is subject to ongoing refinements and/or replacement resulting from industry research as well as performance analysis that may better inform model assumptions, improvements to modeling capabilities and approaches and other factors. Second-Lien Model: The RMBS cash flow model estimates mortgage loan collateral performance, the effect of such collateral cash flows within the transaction waterfall and the liability structure we insure. Collateral performance is frequently modeled at the deal level given the paucity of mortgage loan level data for second-lien transactions. In the absence of specific loan-level information, the deal-level approach evaluates a loan pool as if it were a single loan, selecting certain aggregated deal-level characteristics to then perform a series of statistical analyses. We use three HPA projection scenarios to develop a base case as well as stress and upside cases. The highest probability is assigned to the base case, with lower probabilities to the stress and upside cases. This deal- level approach takes relatively complicated monthly collateral | Ambac Financial Group, Inc. 33 2017 FORM 10-K | performance and divides it into two parts: a borrower-behavior- dependent stage and a servicer-behavior-dependent stage. has a negligible benefit to loss reserves for the remaining three transactions with pool-level mortgage insurance. The borrower-behavior-dependent stage is designed to forecast the probability of a loan’s present delinquency status transitioning to any of eight future statuses. The deal-level approach projects performance using a roll-rate that evaluates the possible future state of a loan based on its current status and three variables: average FICO (credit score), average current consolidated loan to value ratio (“CLTV”) and an overall quality indicator. The servicer- behavior-dependent stage governs a loan’s life cycle after it reaches 180 or more days delinquent. This stage evaluates the servicer’s propensity to foreclose or pursue a short sale, the speed of the foreclosure process, and the speed of the post-foreclosure distressed property liquidation. The transition probabilities between stages are assumed by the model to depend upon how long a loan has already been in a particular status, as well as on the servicer-specific and state-specific liquidation (e.g., a judicial or statutory foreclosure state) timeline factors. First-Lien Model: For most first-lien transactions, the RMBS cash flow model utilizes mortgage loan level data from recognized market sources to calculate probability of default and prepayment based on loan characteristics. The loan-level approach of the RMBS cash flow model uses results of a regression analysis to project prepayment and default vectors on a monthly basis. For first-lien transactions that do not have loan-level data available, we use the deal-level approach of the model that is described in the Second-Lien section above. There are three general stages with the loan-level approach of the model: current, prepayment or default. The model then looks beyond the stages to assess a set of loans based on a number of individual characteristics that are distinct to that set of loans. The model will project performance based on the borrower’s given probability of transitioning that month. Servicer behavior is a variable in the loan-level approach; computing the impact of servicing on the associated collateral. Consistent with the second- lien modeling, we consider three HPA scenarios in the RMBS cash flow model to develop a base case as well as stress and upside cases. The highest probability is assigned to the base case, with lower probabilities to the stress and upside cases. Other RMBS Factors: Additional factors that may impact ultimate RMBS second-lien and first-lien losses include, but may not be limited to, mortgage insurance, servicer intervention and third-party settlements. Mortgage insurance: Three of our mortgage-backed transactions have active pool-level mortgage insurance; which consists of a master policy issued to the mortgage securitization trust that indemnifies the trust either on a first loss or mezzanine basis in the event that covered mortgage loans in the trust default. The mortgage insurance master policy includes various conditions such as exclusions, conditions for notification of loans in default and claims settlement. We have noted with regard these securitization trusts, payments by mortgage insurers of claims presented by the securitization trusts have been inconsistent, resulting in higher claims presented under Ambac Assurance’s financial guarantee policies. The pool-level mortgage insurance to Servicer Intervention: We include in our modeling the steps which Ambac is taking to address shortcomings in servicing performance. Ambac has initiated programs with selected servicers that we believe will mitigate losses on such transactions through intervention strategies such as loan modifications, improved liquidation timelines and short sales. Ambac believes these are the principal controllable factors that will result in reduced losses over time. Given the uncertainty in initiating additional programs of this nature, we give credit in our models only on exposures that have already transferred servicing or entered into special servicing agreements. Third party settlements: To the extent that we are aware of settlements between issuers and investors or trustees which may provide for recoveries within certain insured RMBS trusts, we have incorporated in our modeling of collateral losses our estimate of the probable amount and timing of these settlements. Expected Representation and Warranty Subrogation Recoveries Ambac records as a component of its loss reserve estimate subrogation recoveries related to securitized loans in RMBS transactions that breached certain representations and warranties ("R&W") described herein. Generally, the sponsor of an RMBS transaction provided representations with respect to the securitized loans, including representations with respect to the loan characteristics, the absence of borrower fraud in the underlying loan pools or other misconduct in the origination process and attesting to the compliance of loans with the prevailing underwriting policies. In such cases, the sponsor of the transaction is contractually obligated to repurchase, cure or substitute collateral for any loan that breaches the representations or warranties The RMBS R&W subrogation recovery estimate is subject to significant uncertainty, including risks inherent in litigation, collectability of such amounts from counterparties and/or their respective parents and affiliates, timing of receipt of any such recoveries, intervention by OCI which could impede our ability to take actions required to realize such recoveries and uncertainties inherent in the assumptions used in estimating such recoveries. Refer to Note 2. Basis of Presentation and Significant Accounting Policies and Note 7. Financial Guarantee Insurance Contracts to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for more information regarding the estimation process for representation and warranty subrogation recoveries. Student Loan Expected Loss Estimate The student loan portfolio consists of credits collateralized by private student loans. The calculation of loss reserves for our student loan portfolio involves evaluating numerous factors that can impact ultimate losses. The factor which contributes the greatest degree of uncertainty in ascertaining appropriate loss reserves is the long final legal maturity date of the insured bonds. Most of the student loan bonds which we insure were issued with original terms of 20 to 40 years until final maturity. Since our policy covers timely interest and ultimate principal payment, our loss projections must make assumptions for many factors covering a long time horizon. Key assumptions that will impact ultimate losses include, but are not limited to, the following: collateral | Ambac Financial Group, Inc. 34 2017 FORM 10-K | performance (which is highly correlated to the economic environment), interest rates, operating risks associated with the issuer, servicers, special servicers, and administrators, investor appetite for tendering or commuting insured obligations and, as applicable, Ambac’s ability and willingness to commute policies. In addition, we consider in our student loan loss projections the potential impact, if any, of proposed or final regulatory actions or orders, including by the Consumer Financial Protection Bureau ("CFPB"), affecting our insured transactions. In evaluating our student loan portfolio, our losses are projected using a cash flow modeling approach. In order to project collateral performance under the cash flow approach, we use an internally developed default projection tool that constructs lifetime cohort default curves based on loan and deal-level historical performance data. To determine ultimate losses on the transactions, the cohort default curves are used to extrapolate future default behavior. Additionally, a regression-based model is used to estimate recoveries on defaulted loans. This regression-based recovery forecast is grounded in deal-level performance data. Losses for one of the student loans deals is forecast using internal loss estimations to project transaction-level assumptions such as defaults, recoveries and prepayments based on analysis of historical experience adjusted for current economic conditions and changes to collateral composition since origination. In both approaches where collateral performance is projected, the transaction losses are incorporated into a third party waterfall model to develop loss estimates for our exposures. This waterfall model allows us to capture the impact of each transaction’s specific structure (e.g., the waterfall priority of payments, triggers, redemption priority) to generate our specific projected claims profile in various base, upside and downside scenarios. We develop and assign probabilities to multiple cash flow scenarios based on each transaction’s unique characteristics. Probabilities assigned are based on available data related to the credit, information from contact with the issuer (if applicable), and any economic or market information that may impact the outcomes of the various scenarios being evaluated. Our base case usually projects deal performance out to maturity using expected loss assumptions. As appropriate, we also develop other cases that incorporate various upside and downside scenarios that may include changes to defaults and recoveries. Variability of Expected Losses and Recoveries Ambac’s management believes that the estimated future loss component of loss reserves are adequate to cover future claims presented, but there can be no assurance that the ultimate liability will not be higher than such estimates. It is possible that our estimated future loss assumptions for insurance policies discussed above could be understated. We have attempted to identify possible cash flows using more stressful assumptions than the probability-weighted outcome recorded. The possible net cash flows consider the highest stress scenario that was utilized in the development of our probability-weighted expected loss at December 31, 2017 and assumes an inability to execute any commutation transactions with issuers and/or investors. Such stress scenarios are developed based on management’s view about all possible outcomes. In arriving at such view, management makes considerable judgments about the possibility of various future events. Although we do not believe it is possible to have worst case outcomes in all cases, it is possible we could have worst case outcomes in some or even many cases. RMBS Variability: Changes to assumptions that could make our reserves under- estimated include an increase in interest rates, deterioration in housing prices, poor servicing, the effect of a weakened economy characterized by growing unemployment and wage pressures, and/ or illiquidity of the mortgage market. We utilize a model to project losses in our RMBS exposures and changes to reserves, either upward or downward are not unlikely if we used a different model or methodology to project losses. We regularly assess models and methodologies and may change our approach and/or model. Additionally, our R&W actual subrogation recoveries could be significantly lower than our estimate of $1,834 million as of December 31, 2017 if the sponsors of these transactions: (i) fail to honor their obligations to repurchase the mortgage loans, (ii) successfully dispute our breach findings, (iii) no longer have the financial means to fully satisfy their obligations under the transaction documents, or (iv) our pursuit of recoveries is otherwise unsuccessful. In the case of both first and second-lien exposures, the possible stress case assumes a lower housing price appreciation projection, which in turn drives higher defaults and severities. Using this approach, the possible increase in loss reserves for RMBS credits for which we have an estimate of expected loss at December 31, 2017 could be approximately $50 million. Combined with the absence of any R&W subrogation recoveries, a possible increase in loss reserves for RMBS could be approximately $1.9 billion. Additionally, loss payments are sensitive to changes in interest rates, increasing as interest rates rise. For example an increase in interest rates of 0.50% could increase our estimate of expected losses by approximately $60 million. There can be no assurance that losses may not exceed such amounts. Public Finance Variability: It is possible our loss reserves for public finance credits may be under-estimated if issuers are faced with prolonged exposure to adverse political, economic, fiscal or socioeconomic events or trends. Our experience with the city of Detroit in its bankruptcy proceeding was not favorable and renders future outcomes with other public finance issuers even more difficult to predict and may increase the risk that we may suffer losses that could be sizable. We agreed to settlements regarding our insured Detroit general obligation bonds that provide better treatment of our exposures than the city planned to include in its plan of adjustment, but nevertheless required us to incur a loss for a significant portion of our exposure. An additional troubling precedent in the Detroit case, as well as other municipal bankruptcies, is the preferential treatment of certain creditor classes, especially the public pensions. The cost of pensions and the need to address frequently sizable unfunded or underfunded pensions is often a key driver of stress for many municipalities and their related authorities, including entities to whom we have significant exposure, such as Chicago, its school district, the State of New Jersey and many others. Less severe treatment of pension obligations in bankruptcy may lead to worse outcomes for traditional debt creditors. In addition, cities may be more inclined to use bankruptcy to resolve their financial stresses | Ambac Financial Group, Inc. 35 2017 FORM 10-K | if they believe preferred outcomes for various creditor groups can be achieved. We expect municipal bankruptcies and defaults to continue to be challenging to project given the unique political, economic, fiscal, governance and public policy differences among municipalities as well as the complexity, long duration and relative infrequency of the cases themselves in forums with a scarcity of legal precedent. Another potentially adverse development that could cause the loss reserves on our public finance credits to be underestimated is deterioration in the municipal bond market, resulting from reduced or no access to alternative forms of credit (such as bank loans) or other exogenous factors, such as the Tax Cuts and Jobs Act that was signed into law on December 22, 2017, which could potentially reduce municipal investor appetite for tax-exempt municipal bonds by corporate investors and over the longer term could potentially put additional pressure on issuers in states with high state and local taxes. These factors could deprive issuers access to funding at a level necessary to avoid defaulting on their obligations. While our loss reserves consider our judgment regarding issuers’ financial flexibility to adapt to adverse markets, they may not adequately capture sudden, unexpected or protracted uncertainty that adversely affects market conditions. Our exposures to the Commonwealth of Puerto Rico are under stress arising from the Commonwealth’s poor financial condition, weak economy, loss of capital markets access and the severe damage caused by hurricanes Irma and Maria. These factors, taken together with the payment moratorium on debt payments of the Commonwealth and its instrumentalities, ongoing Puerto Rico Oversight, Management, and Economic Stability Act ("PROMESA") Title III proceedings, and certain other provisions under PROMESA, the potential for a restructuring of debt insured by Ambac Assurance, either with or without its consent, and the possibility of protracted litigation as a result of which its rights may be materially impaired, may cause losses to exceed current reserves in a material manner. See "Financial Guarantees in Force" below for further details on the legal, economic and fiscal developments that have impacted or may impact Ambac Assurance’s insured Puerto Rico bonds. For public finance credits, including Puerto Rico as well as other issuers, for which we have an estimate of expected loss at December 31, 2017, the possible increase in loss reserves could be approximately $1.5 billion. However, there can be no assurance that losses may not exceed such amount. Student Loan Variability: Changes to assumptions that could make our reserves under- estimated include, but are not limited to, increases in interest rates, default rates and loss severities on the collateral due to economic or other factors. Such factors may include lower recoveries on defaulted loans or additional losses on collateral or trust assets, including as a result of any enforcement actions of the Consumer Finance Protection Bureau. For student loan credits for which we have an estimate of expected loss at December 31, 2017, the possible increase in loss reserves could be approximately $100 million. Additionally, an increase in interest rates of 0.50% could increase our estimate of expected losses by approximately $35 million. There can be no assurance that losses may not exceed such amount. Other Credits, including Ambac UK, Variability: It is possible our loss reserves on other types of credits, including those insured by Ambac UK, may be under-estimated because of various risks that vary widely, including the risk that we may not be able to recover or mitigate losses through our remediation processes. For all other credits, including Ambac UK, for which we have an estimate of expected loss, the sum of all the highest stress case loss scenarios is approximately $250 million greater than the loss reserves at December 31, 2017. However, there can be no assurance that losses may not exceed such amount. Valuation of Certain Financial Instruments: The Fair Value Measurement Topic of the ASC requires financial instruments to be classified within a three-level fair value hierarchy. The fair value hierarchy, the financial instruments classified within each level, our valuation methods, inputs, assumptions and the review and validation procedures over quoted and modeled pricing are further detailed in Note 9. Fair Value Measurements to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K. The level of judgment in estimating fair value is largely dependent on the amount of observable market information available to fair value a financial instrument, which is also determinative of where the financial instrument is classified in the fair value hierarchy. Level 3 instruments are valued using models which use one or more significant inputs or value drivers that are unobservable and therefore require significant judgment. Level 3 financial instruments which are material include certain interest rate swaps, investments in certain Ambac-insured fixed income securities, and certain VIE assets and liabilities. Model-derived valuations of certain Level 3 financial instruments incorporate estimates of the effects of Ambac's own credit risk and/or counterparty credit risk, which can be complex and judgmental. Level 2 instruments are valued using quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in inactive markets and model-derived valuations where all the significant inputs are observable in active markets. Certain Level 2 fixed income securities that have lower trading volumes, fewer comparable securities in the market or less coverage by alternative pricing sources with reasonable levels of price transparency may require additional validation procedures and involve significant judgment. As a result of the increased judgment for the above-described Level 3 and Level 2 instruments, the actual trade value of the financial instrument in the market, or exit value of the financial instrument owned by Ambac, may be significantly different from its recorded fair value. Moreover, fixed income securities classified as “available-for- sale” which have experienced declines in fair value below Ambac's amortized cost must be evaluated for other-than-temporary if impairment ("OTTI"). An OTTI charge management assesses it either (i) has the intent to sell the security or (ii) more likely than not will be required to sell the security before the anticipated recovery of its amortized cost basis less any current period credit loss. This impairment assessment also involves determining whether an actual credit loss exists for the security. Evaluating whether declines in fair value are other-than- temporary is also inherently judgmental. For further information on the OTTI evaluation process refer to Note 2. Basis of is recognized | Ambac Financial Group, Inc. 36 2017 FORM 10-K | Presentation and Significant Accounting Policies the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K. to Valuation of Deferred Tax Assets: Our provision for taxes is based on our income, statutory tax rates and tax planning opportunities available to us in the jurisdictions in which we operate. Tax laws are complex and subject to different interpretations by the taxpayer and respective governmental taxing authorities. Significant judgment is required in determining our tax expense and in evaluating our tax positions. We review our tax positions quarterly and adjust the balances as new information becomes available. In December 2017, H.R.1 (commonly known as the Tax Cut and Jobs Act or"TCJA") was enacted and introduced significant changes to the U.S. tax code, including to corporate tax rates, business-related exclusions, and deductions and credits effective January 1, 2018. In accordance with U.S. GAAP, the effects of changes in tax rates and laws on current and deferred tax balances must be recognized in the period in which the legislation is enacted. As such, we incorporated the effects of the TCJA in our valuation of deferred tax assets for the year ended December 31, 2017. Deferred tax assets arise because of temporary differences between the financial reporting and tax bases of assets and liabilities, as well as from net operating loss ("NOL") and tax credit carry forwards. More specifically, deferred tax assets represent a future tax benefit (or receivable) that results from losses recorded under GAAP in a current period which are only deductible for tax purposes in future periods and NOL carry forwards. The NOL carryforward component of the deferred tax asset, which relates to NOLs generated prior to the effective date of the TCJA, will expire if not utilized within certain periods. Valuation allowances are established to reduce deferred tax assets to an amount that “more likely than not” will be realized. All available evidence, both positive and negative, needs to be identified and considered in making the determination with significant weight given to evidence that can be objectively verified. The level of deferred tax asset recognition is influenced by management’s assessment of future expected taxable income, which depends on the existence of sufficient taxable income of the appropriate character (ordinary vs. capital) within the carry forward periods available under the tax law. As a result of the risks and uncertainties associated with future operating results, management believes it is more likely than not that the Company will not generate sufficient taxable income to recover the deferred tax asset and therefore has a full valuation allowance. See Note 14. Income Taxes for additional information on the Company's deferred income taxes, including the effects of the TCJA. FINANCIAL GUARANTEES IN FORCE Financial guarantee products were sold in three principal markets: U.S. public finance, U.S. structured finance and international finance. The following table provides a breakdown of guaranteed net par outstanding by market sector at December 31, 2017 and 2016. Net par exposures within the U.S. public finance market include capital appreciation bonds which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bonds. Guaranteed net par outstanding includes the exposures of policies that insure variable interest entities (“VIEs”) consolidated by Ambac. Guaranteed net par outstanding excludes the exposures of policies that insure bonds which have been refunded or pre-refunded: ($ in millions) December 31, 2017 2016 Public Finance Structured Finance International Finance Total net par outstanding $ $ 32,088 $ 13,816 16,812 62,716 $ 45,062 16,951 17,333 79,346 Included in the above net par exposures at December 31, 2017 and 2016 are $326 million and $737 million, respectively, of exposures that were executed in the form of credit derivatives. See Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Item 8, “Financial Statements and Supplementary Data” for further discussion of credit derivative exposures. Certain guaranteed bonds were issued as floating rate debt, including Auction Rate Securities and Variable Rate Demand Obligations, which introduces interest rate risk to Ambac Assurance. Refer to Auction Rate Securities and Variable Rate Demand Obligation Exposures below for further discussion. U.S. Public Finance Insured Portfolio Ambac’s portfolio of U.S. public finance exposures is $32,088 million, representing 51% of Ambac’s net par outstanding as of December 31, 2017 and a 29% reduction from the amount outstanding at December 31, 2016. This reduction in exposure was mainly due to normal exposure runoff in addition to early terminations (calls, refundings and pre-refundings). While Ambac’s U.S. public finance portfolio consists predominantly of municipal bonds such as general obligation and revenue, lease and tax-backed obligations of state and local government entities, the portfolio also comprises a wide array of non-municipal types of bonds, including financings for not-for-profit entities and transactions with public and private elements, which generally finance infrastructure, housing and other public interests. See Note 6. Financial Guarantees in Force to the Consolidated Financial Statements, included in Part II, Item 8 in this Form 10-K for exposures by bond type. Municipal bonds are generally supported directly or indirectly by the issuer’s taxing authority or by public sector fees and assessments which may or may not be specifically pledged. Risk factors in these transactions derive from the municipal issuer, including its fiscal management, politics, and economic position, as well as its ability and willingness to continue to pay its debt service. Municipal bankruptcies and similar proceedings, while still relatively uncommon, have occurred, exposing Ambac to the risk of liquidity claims and ultimate losses if issuers cannot successfully adjust their liabilities without impairing creditors. Not-for-profit transactions are generally supported by the not-for- profit entities’ net revenues and may also include specific pledges, liens and/or mortgages. The entity typically serves a well-defined market and promulgates a public purpose mission. These transactions may afford Ambac contractual protections such as financial covenants and control rights in the event of issuer breaches and defaults. Risk factors in these transactions derive from the creditworthiness of the issuer, including but not limited to, its financial condition, leverage, management, business mix, competitive position, trends, government programs, etc. Examples of these types of transactions industry and socioeconomic | Ambac Financial Group, Inc. 37 2017 FORM 10-K | include not-for-profit hospitals, universities, associations and charities. Public/private transactions are generally structured to achieve their targeted public interest objective without direct support from the public sector. Some examples of this type of financing include affordable housing, private education, and privatized military and student housing. Protections within these financings provided to Ambac usually include the strength of the financed asset’s essentiality and public purpose and may include financial covenants, collateral and control rights. Risk factors include financial underperformance, event risk and a shift in the asset’s mission or essentiality. One example of this type of financing is U.S. military housing. Ambac insures approximately $5.8 billion net par of privatized military housing debt. The debt was issued to finance the construction and/or renovation of housing units for military personnel and their families on domestic U.S. military bases. Debt service is not directly paid or guaranteed by the U.S. Government. Rather, the bonds are serviced from the cash flow generated in most cases by rental payments deposited by the military directly into lockbox accounts as part of each service personnel’s Basic Allowance for Housing (BAH). In a small number of cases rental payments are also coming from civilians, including retired service personnel, living on a particular base. Collateral for these transactions includes the BAH payments as well as an interest in the ground lease. Risk factors affecting these transactions include ongoing base essentiality, military deployments, the U.S. government’s commitment to fund the BAH, marketability/ attractiveness of the on-base housing units versus off-base housing, construction completion, environmental remediation, utility and other operating costs, and housing management. Puerto Rico its Ambac has exposure to the Commonwealth of Puerto Rico (the "Commonwealth") and instrumentalities across several different issuing entities. Each has its own credit risk profile attributable to discrete revenue sources, direct general obligation pledges and general obligation guarantees. Most Puerto Rico bonds insured by Ambac Assurance are not subject to acceleration. The Ambac-insured Puerto Rico Convention Center District Authority (Hotel Occupancy Tax) bonds may be accelerated only with the consent of, or at the direction of, Ambac Assurance. The Ambac-insured Puerto Rico Sales Tax Financing Corporation's Senior Sales Tax Revenue bonds may be accelerated only with the consent of Ambac Assurance, subject to the Ambac financial guaranty insurance policy being in full force and effect. Other Ambac-insured Puerto bonds are not subject to acceleration. Ambac Assurance's insurance policies do not insure against loss of any acceleration payment, other than at the sole option of Ambac. Suspension of Debt Service Payments In late 2015, due to the activation of the Commonwealth Constitution's Priority Debt Provision, certain revenues pledged for the repayment of debt issued by Puerto Rico Infrastructure Financing Authority (“PRIFA”), Puerto Rico Highways and Transportation Authority (“PRHTA”) and Puerto Rico Convention Center District Authority (“PRCCDA”) were diverted by the Commonwealth to be applied to the Commonwealth's debt obligations and not applied to debt service on PRIFA, PRHTA and PRCCDA debt obligations. Consequently, a default on debt service due on certain PRIFA bonds insured by Ambac Assurance occurred on January 1, 2016. In April 2016, the Commonwealth became subject to an emergency moratorium, known as "Law 21," on debt payments of the Commonwealth and its instrumentalities. Beginning in April 2016, and culminating on June 30, 2016, former Governor Padilla issued additional executive orders under Law 21 declaring states of emergency at PRHTA, PRIFA, PRCCDA, and other Puerto Rico instrumentalities through January 31, 2017, and suspending payment obligations on bonds issued by those entities, including bonds insured by Ambac Assurance. On January 29, 2017, current Governor Rosselló enacted Act 5 of 2017 known as the Puerto Rico Financial Emergency and Fiscal Responsibility Act of 2017 (“Act 5”) which, among other things, established an emergency period and declared executive orders under Act 21, which suspended payments on General Obligation debt and other debt, to continue in full force and effect until amended, rescinded or superseded. On December 28, 2017, the emergency period was extended to June 30, 2018 by Executive Order 2017-76. PROMESA Law On June 30, 2016, the Puerto Rico Oversight, Management, and Economic Stability Act ("PROMESA") was signed into law by the President of the United States. PROMESA establishes a seven- member federal financial oversight board (“Oversight Board”) with authority to require that balanced budgets and fiscal plans be adopted and implemented by Puerto Rico. PROMESA provides a legal framework under which the debt of the Commonwealth and its related authorities and public corporations may be voluntarily restructured, and grants the Oversight Board the sole authority to file restructuring petitions in a federal court to restructure the debt of the Commonwealth and its related authorities and public corporations if voluntary negotiations fail, provided that any such restructuring must be in accordance with an Oversight Board approved fiscal plan that respects the liens and priorities provided under Puerto Rico law. PROMESA provides that laws such as Act 21 are not binding on any non-consenting creditor to the extent they prohibit the payment of principal or interest. The practical effect of this provision is unknown and therefore Ambac is at risk to the ongoing execution, interpretation and ultimate enforcement of this provision. PROMESA also provides that unlawful executive orders are preempted under PROMESA, but there is no procedure for determining whether a particular executive order is unlawful, creating uncertainty in general and with specific regards to how the preemption provision will be implemented towards Ambac’s exposures. specifically PROMESA is untested and many provisions are unique. There is inherent uncertainty and risk both generally and for Ambac’s exposures interpretation and regarding implementation of PROMESA. Among other things, PROMESA contains provisions that may permit consensual and non- consensual the Commonwealth and its instrumentalities. restructurings of debt obligations of the The following table shows Ambac's insured exposure to each issuer segregated by whether such debt obligation is subject to the Priority | Ambac Financial Group, Inc. 38 2017 FORM 10-K | Debt Provision or "clawback." Ambac has initiated litigation challenging the application of the "clawback" announced by Governor Padilla, Puerto Rico's former governor, on December 1, 2015. A description of Ambac's legal challenge is provided in Note 16. Commitments and Contingencies in the Consolidated Financial Statements, included in Part II, Item 8 in this Form 10- K. Range of Maturity Ambac Ratings (1) Net Par Outstanding (2) Net Par and Interest Outstanding (3)(8) Ever-to-Date Net Claims Paid(4) ($ in millions) Exposures Subject to Priority Debt Provision (5) PR Highways and Transportation Authority (1968 Resolution - Highway Revenue) (6) PR Highways and Transportation Authority (1998 Resolution - Senior Lien Transportation Revenue) (6) PR Infrastructure Financing Authority (Special Tax Revenue) (7) PR Convention Center District Authority (Hotel Occupancy Tax) Total 2018-2027 2018-2042 2018-2044 2018-2031 Exposures Not Subject to Priority Debt Provision Commonwealth of Puerto Rico - General Obligation Bonds 2019-2023 PR Public Buildings Authority - Guaranteed by the Commonwealth of Puerto Rico PR Sales Tax Financing Corporation - Senior Sales Tax Revenue (COFINA) Total Total Net Exposure to The Commonwealth of Puerto Rico and Related Entities 2018-2035 2047-2054 BIG BIG BIG BIG BIG BIG BIG $ 14 $ 20 $ 419 439 125 997 56 110 805 971 746 970 184 1,920 64 187 7,321 7,572 13 35 104 12 164 4 37 — 41 $ 1,968 $ 9,492 $ 205 (1) Internal credit ratings are provided solely to indicate the underlying credit quality of guaranteed obligations based on the view of Ambac Assurance. In cases where Ambac Assurance has insured multiple tranches of an issue with varying internal ratings, or more than one obligation of an issuer with varying internal ratings, a weighted average rating is used. Ambac Assurance credit ratings are subject to revision at any time and do not constitute investment advice. BIG denotes credits deemed below investment grade. (2) Net Par includes capital appreciation bonds, which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bonds. Accretion of the capital appreciation bonds would increase the related net par by $683 million at December 31, 2017. (3) Net Par and Interest Outstanding ("P&I") represents the total insured future debt service remaining over the lifetime of the bonds. P&I for capital appreciation bonds does not represent the accreted amount as noted in footnote (2) but rather the amount due at respective maturity dates. (4) In addition to ever-to-date net claims paid, Ambac made net claim payments of $26 million during January 2018. (5) Commonly known as "clawback" provision pursuant to Section 8 of Article VI of the Constitution of the Commonwealth of Puerto Rico. Under this provision, in case the available revenues (the Spanish version uses the term “resources”) including surplus for any fiscal year are insufficient to meet the appropriations made for that year, interest on the public debt and amortization thereof shall first be paid, and other disbursements shall thereafter be made in accordance with the order of priorities established by law. These exposures are also subject to Act No. 5-2017, as amended, also known as the Financial Emergency and Fiscal Responsibility Act of 2017, which declares an emergency period that has been subsequently extended until June 30, 2018. Pursuant to Act 5-2017, all executive orders issued under Act No. 21-2016 (as amended, known as the Puerto Rico Emergency Moratorium and Financial Rehabilitation Act), shall continue in full force and effect until amended, rescinded or superseded. (6) Certain Pledged Revenues for Highways and Transportation Revenue Bonds such as Toll Revenues and Investment Earnings are not subject to the Priority Debt Provision. (7) Payable from and secured by proceeds from a federal excise tax imposed on all items produced in Puerto Rico and sold on the mainland of the United States. Currently, rum is the only product from Puerto Rico subject to this federal excise tax. (8) Net Par and Interest Outstanding excludes the effects of a 10% current interest rate on $60 million net par of PR Public Building Authority ("PBA") bonds with a maturity date of July 1, 2035, resulting from the absence of a remarketing. Should a remarketing not occur before the maturity of the bonds, the Net Par and Interest Outstanding for PBA exposure would increase by $47.4 million. PROMESA also confers significant powers and responsibilities on the Oversight Board. Among other things, the Oversight Board is required to certify any insolvency petitions that may be filed by Puerto Rico or its instrumentalities under Title III of PROMESA, any proposed plans of adjustment in such proceedings, and any voluntary restructuring agreement among creditors under Title VI of PROMESA (which has the potential to bind non-consenting creditors). The Oversight Board is also required to approve fiscal plans and budgets submitted by the Commonwealth and monitor compliance with those plans and budgets, and to approve any debt issuances or modifications by the Commonwealth or its instrumentalities. Ambac is unable to predict to what extent debt restructurings will be proposed or implemented under PROMESA, and how its insured obligations will fare in any such restructurings. Title III Filings In response to letter requests from Governor Rosselló, the Oversight Board commenced a PROMESA Title III proceeding, which is a proceeding for adjustments of debt, for the Commonwealth of Puerto Rico on May 3, 2017, and for the Puerto Rico Sales Tax Financing Corporation ("COFINA") on May 5, 2017, in the United States District Court for the District of Puerto | Ambac Financial Group, Inc. 39 2017 FORM 10-K | Rico. Subsequently, the Oversight Board commenced a Title III proceeding for the Employees Retirement System ("ERS") and PRHTA on May 21, 2017, and for the Puerto Rico Electric Power Authority ("PREPA") on July 2, 2017. Ambac Assurance has not issued any financial guaranty policies with respect to obligations of ERS or PREPA. Fiscal Plans for ("FEGP") to be paid by On March 13, 2017, the Oversight Board certified the 10-year Fiscal and Economic Growth Plan the Commonwealth. The certified FEGP, among other things, was intended to provide Commonwealth creditors a base from which to progress consensual negotiations under Title VI of PROMESA. However, the certified FEGP implied a 77% discount to all debt service due its instrumentalities covered by the FEGP over the ten-years of the plan (FY2017-2026). The FEGP did not provide details regarding its underlying assumptions and data, expense definitions, cause of expense growth or accounting adjustments and did not include any restructuring proposals. These deficiencies of the FEGP, when combined with the absence of sufficient projected cash flows for debt service, increased the uncertainty of whether successful consensual negotiations can be reached or what creditor outcomes might be under the Title III proceedings. the Commonwealth and As a result of the damage inflicted by Hurricane Maria in September 2017, the anticipated influx of certain federal funds, and other structural changes following the hurricane, the Commonwealth drafted revised fiscal and economic growth plans (the “Revised FEGPs”) for the Commonwealth and various instrumentalities. On January 24, 2018, the Puerto Rico Fiscal Agency and Financial Advisory Authority (“FAFAA”) released the proposed Revised FEGPs for the Commonwealth, PREPA and Puerto Rico Aqueduct and Sewer Authority (“PRASA”). The proposed Revised FEGPs were also submitted to the Oversight Board for review and certification. On February 5, 2018, the Oversight Board issued a notice of violation with respect to each of these Revised FEGPs. In the notice of violation for the Revised FEGP for the Commonwealth, the Oversight Board required a more detailed debt sustainability analysis over a 30-year period, among other changes. The required changes and further clarifications to the Commonwealth, PREPA, and PRASA FEGPs were submitted to the Oversight Board on February 12, 2018. Subsequent review and certification by the Oversight Board is intended to be complete by March 30, 2018. The Commonwealth’s proposed Revised FEGP submitted on February 12, 2018, uses a six-year horizon, projects a six-year cumulative decline in population of 20.0%, cumulative nominal GNP growth of 16.7%, cumulative revenue growth of 3.1%, and projects that by the Commonwealth's fiscal year 2023 there will be an accumulated surplus of $3.4 billion. However, this proposed Revised FEGP does not delineate expenses between essential and non-essential services, does not define essential services, and does not provide for any cash flows for debt service. This proposed Revised FEGP also does not address permanent debt write-downs and the extent of longer-term debt service, leaving uncertainty about the Commonwealth’s future obligations. If certified without meaningful changes from the current proposed plans, the Revised FEGPs of the Commonwealth, PREPA, and PRASA could perpetuate the uncertainty around the potential timing and severity of any permanent losses on Ambac-insured bonds of the Commonwealth and its instrumentalities and may lead to further protracted resolution timelines between creditors and debtors. Furthermore, if the Revised FEGPs, without meaningful changes, became the sole or primary measure for determining creditor outcomes, Ambac's financial condition, including liquidity, loss reserves and capital resources may suffer a materially negative impact. The proposed Revised FEGPs for the Government Development Bank, the University of Puerto Rico, PRHTA and the COSSEC (the savings and loan cooperatives regulators) are due to be submitted March 9, 2018, which the Oversight Board intends to review and certify by April 20, 2018. It is currently unclear what, if anything, the revised fiscal plan for PRHTA will do to address the restructuring of its debt obligations. However, any such restructuring proposal may include material cuts to payment of principal and interest on outstanding bonds of PRHTA, including bonds insured by Ambac Assurance. Hurricanes Irma and Maria On September 6, 2017, Hurricane Irma, a Category 5 storm, passed north of Puerto Rico leaving more than 1 million people without electricity on the island. On September 20, 2017, Hurricane Maria, a Category 4 storm at the time, made landfall in Puerto Rico, causing severe damage to the island and its infrastructure, including the destruction of a significant portion of the the electrical transmission and distribution system on the the island. The extensive damage and the disruption to the economy caused by the hurricanes further stressed what was already a challenging position for the Commonwealth highlighted by: (i) existing poor economic and demographic trends, including fluctuating economic activity levels and continued outmigration, (ii) weak debt and contingent liability position, including unsustainable leverage and high fixed costs for pensions; (iii) historically weak budgetary performance and flexibility (Fiscal Year 2016 and prior structural imbalances); and (iv) uncertain financial and economic prospects. For at least the near-term, the Commonwealth faces uncertain financial and economic prospects due to the scale of the damage from the hurricanes as well as the uncertainty over the total amount, timing, and impact of Federal aid for disaster recovery. Federal Aid On November 13, 2017, Governor Rosello submitted a formal request for Federal disaster relief assistance of $94.4 billion to help the Commonwealth recover and rebuild from hurricanes Irma and Maria. It is unclear at this time how much of Governor Rosello's request or in what form will ultimately be made available to assist Puerto Rico. To date, $4.9 billion is being made available to Puerto Rico and the U.S. Virgin Islands as a Community Development Loan ("CDL") as part of a $36.5 billion disaster aid bill signed into law on October 26, 2017. In addition, the Federal Emergency Management Agency ("FEMA") reported that in the last three months of 2017, its obligations under the Disaster Recovery Funds ("DRF") program for Puerto Rico for hurricanes Irma and Maria totaled $6.7 billion with another $7.0 billion estimated for the nine months ending September 30, 2018. On February 9, 2018, the Bipartisan Budget Act of 2018 was signed into law. There were several elements of this legislation that were | Ambac Financial Group, Inc. 40 2017 FORM 10-K | targeted to assist in the recovery of Puerto Rico, including $4.8 billion in Medicaid funding for two years; $11 billion for the U.S. Housing and Urban Development's Community Development Block Grant Disaster Relief program for housing, infrastructure and economic development; additional funding for FEMA's DRF program; and other disaster aid measures. In addition, the legislation provides for an extension to 2022 of the rum excise tax cover-over that provides increased rum tax rebates for Puerto Rico, extends by one year deductions allowable with respect to income attributable to domestic production activities in Puerto Rico under U.S. Code Section 199, and also adds each low-income community in Puerto Rico to be designated as a qualified opportunity zone under Sec. 1400Z-1, which allows those areas to qualify for certain tax incentives. The total value of all of the Puerto Rico-specific elements of the legislation is unclear at this time and it is possible that additional Federal aid packages may be approved during the course of 2018. of PROMESA, and one has been stayed by order of the United States District Court for the District of Puerto Rico pending resolution of an interpleader action related to COFINA funds (to which interpleader action Ambac is also a party). The three active litigations are proceeding as adversary proceedings under the Title III process before the United States District Court for the District of Puerto Rico. Accordingly, Ambac is unable to predict when and how the issues raised in those cases will be resolved. If Ambac Assurance is unsuccessful with any of these challenges, Ambac’s financial condition, including liquidity, loss reserves and capital resources may suffer a material negative impact. Refer to Note 16. Commitments and Contingencies included in Part II, Item 8 in this Form 10-K for further information about Ambac's litigation relating to Puerto Rico. Other Post-Title III Litigation Update Tax Reform See Item 1A. Risk Factors Commonwealth Liquidity for and liquidity the Commonwealth The publishing on January 19, 2018, by FAFAA of an updated report on $6.8 billion of cash balances and the classification of approximately 800 bank accounts originally addressed in FAFAA’s initial December 18, 2017 report did not appear to provide for any enhanced its instrumentalities, as the report claimed that much of this balance had restricted uses or was tied up in ongoing litigation. Consequently, this purported lack of access to a portion of these funds could exacerbate existing liquidity constraints of the Commonwealth and its instrumentalities for certain essential and non-essential services and further strain timelines and potential severities for creditors, including Ambac. In connection with the report, the Oversight Board confirmed that it appointed an independent forensic analysis team to compile a comprehensive inventory of all government bank accounts, cash equivalents, and investments along with their respective account balances. Mediation On June 14, 2017, Judge Laura Taylor Swain entered an order appointing a team of mediators to facilitate confidential mediation discussions in order to facilitate consensual resolution of certain issues arising in the context of these Title III cases. The mediation team is led by Chief Judge Barbara Houser of the United States Bankruptcy Court for the Northern District of Texas, and consists of Circuit Judge Thomas Ambro of the United States Court of Appeals for the Third Circuit, Senior District Judge Nancy Atlas of the United States District Court for the Southern District of Texas, Bankruptcy Judge Christopher Klein of the United States Bankruptcy Court for the Eastern District of California, and Senior District Judge Victor Marrero of the United States District Court for the Southern District of New York. Confidential mediation proceedings are ongoing. No assurances can be given that consensual resolutions will be achieved with respect to the Commonwealth’s or COFINA’s obligations or those of any other Puerto Rico instrumentality. On January 30, 2018, the United States District Court for the District of Puerto Rico issued two decisions in adversary proceedings related the Commonwealth of Puerto Rico and certain of its instrumentalities. the Title III restructuring of to In Assured Guaranty Corp., et al. v. Commonwealth of Puerto Rico, et al. (No. 17-155), the court dismissed the plaintiff monoline insurers’ complaint against the Commonwealth and the PRHTA (among other defendants). The court ruled that the special revenues provisions of the Bankruptcy Code do not require a debtor, post- petition, to apply the special revenues to the bonds they secure. The court also held that the plaintiffs were unable to show that bondholders have an ownership interest, to the exclusion of PRHTA, in the funds held in certain reserve accounts at PRHTA. The court rejected the Commonwealth and Oversight Board’s argument that Section 305 of PROMESA, a provision that reserves the right of the Title III debtor to control its own governmental powers and property, deprives the court of jurisdiction over certain claims; instead, the court held that section 305 only limits the court’s ability to order remedies that would interfere with the debtor’s governmental powers or ability to control its property. The court did not address whether the PRHTA bonds are secured by a lien or security interest. Ambac Assurance brought similar claims (among others) in Ambac Assurance Corporation v. Puerto Rico, et al. (No. 1:17-ap-00159). The court has not yet ruled on Ambac Assurance’s claims, but in light of its decision in the Assured case, there is a substantial risk that the court will dismiss such claims for the same reasons it dismissed the complaint of the monoline insurers in Assured. In ACP Master, Ltd., et al. v. Commonwealth of Puerto Rico, et al. (No. 17-189), the court dismissed the plaintiff general obligation (“GO”) bondholders’ complaint against the Commonwealth and the Oversight Board. The court held that the GO bondholders’ effort to compel application of certain revenues to the payment of GO bonds was barred by section 305 of PROMESA, as this ruling would interfere with the governmental powers of the debtor (the Commonwealth). The court further held that the remaining counts of the plaintiffs’ complaint, which requested declarations as to the legal status of the GO bonds could not be adjudicated because they sought advisory opinions and therefore were not justiciable. Ambac Post-Title III Litigation Update Ambac Assurance is party to ten litigations related to its Puerto Rico exposures. Six of these litigations are stayed under Title III The court’s decisions that section 305 of PROMESA restricts the court’s ability to order remedies that would interfere with the debtor’s governmental powers or ability to control its property, if | Ambac Financial Group, Inc. 41 2017 FORM 10-K | not overturned on appeal, likely will limit the ability of Ambac Assurance to successfully compel the payment of debt service on its insured obligations during the pendency of the Title III cases and may adversely impact the proposed terms applicable to such obligations under any plan of adjustment proposed in Title III proceedings. Any such proposed plan of adjustment would, however, need to satisfy the requirements of PROMESA, including consistency with certified fiscal plans, which are required to respect lawful priorities or lawful liens, in order to be approved by the court. Accordingly, Ambac Assurance is unable to predict when and how the issues raised in its cases will be resolved ultimately. If Ambac Assurance is unsuccessful with any of its challenges, its financial condition, including liquidity, loss reserves and capital resources, may suffer a material negative impact. Summary As a result of the developments described in this 10-K, the Commonwealth of Puerto Rico and certain of its instrumentalities will continue to default on debt service payments, including payments owed on bonds insured by Ambac Assurance. Ambac Assurance may be required to make significant amounts of policy payments over the next several years, the recoverability of which is subject to great uncertainty, which may lead to material permanent losses. Our exposure to Puerto Rico is impacted by the amount of monies available for debt service, which is in turn affected by variability in economic growth, tax revenues, essential services expense as well as federal funding of Commonwealth needs. In addition, our exposure to Puerto Rico is impacted by the significant damage to the Commonwealth that was inflicted by Hurricane Maria, which made landfall on September 20, 2017, as well as Hurricane Irma, which passed just north of the island on September 6, 2017. The longer term recovery of the economy of the Commonwealth and its essential infrastructure will likely be highly dependent on the amount, timing and effectiveness of Federal aid. There is historical precedent for meaningful Federal support following other natural disasters in the United States and its territories and, to date, some Federal aid measures have been approved and have already started to assist in the recovery. However, there can be no assurances as to the sufficiency or ultimate level of the aid and as to the effectiveness of the deployment of the aid in benefiting the long term recovery of economic activity in Puerto Rico. While our reserving scenarios reflect a wide range of possible outcomes reflecting the significant uncertainty regarding future developments and outcomes, given our exposure to Puerto Rico and the economic, fiscal, legal and political uncertainties associated therewith as well as the uncertainties emanating from the damage caused by hurricanes Maria and Irma, our loss reserves may ultimately prove to be insufficient to cover our losses, potentially by a material amount, and may be subject to material volatility. possible final Given the numerous uncertainties existing with respect to the restructuring process and relevant litigations, no assurance can be given that ultimate debt service discounts will not be severe and cause Ambac to experience losses materially exceeding current reserves. It is possible that certain restructuring process solutions, together with associated legislation, budgetary, and/or public policy proposals could be adopted and could further impair our exposures. In addition, legal there are determinations, including failing to recognize or properly differentiate legal structures and protections applicable to such exposures, that could result in losses exceeding our current reserves by a material amount and our loss reserves would need to be increased. In particular, in a Title III process, should court- approved plans of adjustment for the Commonwealth, COFINA, PRHTA, or any other issuers of Ambac-insured debt that file for Title III protection imply further discounts to debt service than under the Commonwealth’s Revised FEGP, the Fiscal Plan Compliance Act be upheld, or Ambac receive unfavorable judgments in the litigations to which it is a party, Ambac’s financial condition could be materially adversely affected. It is also possible that economic or demographic outcomes may be worse than forecast under the Commonwealth’s revised FEGP or under proposals or plans promulgated by the Commonwealth or its instrumentalities in or in connection with a Title III process or otherwise. Even a negotiated restructuring to which Ambac agrees as part of a Title VI or other process may involve material losses in excess of current reserves. Ambac has considered these developments and other factors in evaluating its Puerto Rico loss reserves. During the year ended December 31, 2017, Ambac had incurred losses associated with its Domestic Public Finance insured portfolio of $476.3 million, which was significantly impacted by the continued uncertainty and volatility of the situation in Puerto Rico. While management believes its reserves are adequate to cover losses in its Public Finance insured portfolio, there can be no assurance that Ambac may not incur additional losses in the future, particularly given the developing economic, political, and legal circumstances in Puerto Rico. Such additional losses may have a material adverse effect on Ambac’s results of operations and financial condition. | Ambac Financial Group, Inc. 42 2017 FORM 10-K | The table below shows Ambac’s ten largest U.S. public finance exposures, by repayment source, as a percentage of total financial guarantee net par outstanding at December 31, 2017: ($ in millions) New Jersey Transportation Trust Fund Authority - Transportation System Puerto Rico Sales Tax Financing Corporation - Senior Sales Tax Revenue (COFINA) Massachusetts Commonwealth - GO Mets Queens Baseball Stadium Project, NY, Lease Revenue Hickam Community Housing LLC Chicago, IL - GO Puerto Rico Infrastructure Financing Authority, Special Tax Revenue Puerto Rico Highways & Transportation Authority, Transportation Revenue Bragg Communities, LLC New Jersey Economic Development Authority - School Facilities Construction Ambac Ratings(1) Net Par Outstanding (2) BBB+ $ 1,642 BIG AA BBB BBB BBB- BIG BIG A- BBB+ 805 802 564 473 439 438 433 430 400 % of Total Net Par Outstanding 2.6 % 1.3 % 1.3 % 0.9 % 0.8 % 0.7 % 0.7 % 0.7 % 0.7 % 0.6 % Total $ 6,426 10.2% (1) Internal credit ratings are provided solely to indicate the underlying credit quality of guaranteed obligations based on the view of Ambac Assurance. In cases where Ambac Assurance has insured multiple tranches of an issue with varying internal ratings, or more than one obligation of an issuer with varying internal ratings, a weighted average rating is used. Ambac Assurance credit ratings are subject to revision at any time and do not constitute investment advice. BIG denotes credits deemed below investment grade. (2) Net Par includes capital appreciation bonds, which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bonds. U.S. Structured Finance Portfolio Ambac’s portfolio of U.S. structured finance exposures is $13,816 million, representing 22% of Ambac’s net par outstanding as of December 31, 2017, and an 18% reduction from the amount outstanding at December 31, 2016. This reduction in exposure was primarily related to residential mortgage-backed policies, including commutations and other de-risking initiatives on certain residential mortgage-backed policies. Insured exposures include securitizations of mortgage loans, home equity loans, student loans, leases, operating assets, collateralized debt obligations ("CDO"), collateralized loan obligations (“CLO”), and other asset-backed financings, in each case where the majority of the underlying collateral risk is situated in the United States. Included within the lease securitization sector are pooled aircraft and rail car transactions. Additionally, Ambac’s structured finance insured portfolio includes secured and unsecured debt issued by investor-owned utilities, structured insurance transactions and aircraft equipment trust certificates. See Note 6. Financial Guarantees in Force to the Consolidated Financial Statements, included in Part II, Item 8 included in this Form 10-K, for exposures by bond type as of December 31, 2017. Structured finance exposures generally entail three forms of risk: (i) asset risk, which relates to the amount and quality of the underlying assets; (ii) structural risk, which relates to the extent to which the transaction’s legal structure and credit support provide protection from loss; and (iii) servicer risk, which is the risk that poor performance at the servicer or manager level contributes to a decline in cash flow available to the transaction. Ambac Assurance seeks to mitigate and manage these risks through its risk management practices. Structured securities are usually designed to help protect the investors and, therefore, the guarantor from the bankruptcy or insolvency of the entity that originated the underlying assets as well as from the bankruptcy or insolvency of the servicer of those assets. The servicer of the assets is typically responsible for collecting cash payments on the underlying assets and forwarding such payments, net of servicing fees, to a trustee for the benefit of the issuer. One potential issue is whether the sale of the assets by the originator to the issuer would be upheld in the event of the bankruptcy or insolvency of the originator and whether the servicer of the assets may be permitted or stayed from remitting to investors cash collections held by it or received by it after the servicer or the insolvency originator becomes subject proceedings. Another potential issue is whether the originator sold ineligible assets to the securitization transaction that subsequently deteriorated, and, if so, whether the originator has the willingness or financial wherewithal to meet its contractual obligations to repurchase those assets out of the transaction. Structural protection in a transaction, such as control rights that are typically held by the senior note holders, or guarantor in insured transactions, will determine the extent to which underlying asset performance can be influenced upon non-performance to improve the revenues available to cover debt service. to bankruptcy or | Ambac Financial Group, Inc. 43 2017 FORM 10-K | The following table presents the top five servicers by net par outstanding at December 31, 2017, for U.S. structured finance exposures: Servicer ($ in millions) Specialized Loan Servicing, LLC Bank of America N.A. Wells Fargo Bank Pennsylvania Higher Education Assistance Agency Ocwen Loan Servicing, LLC Bond Type Mortgage-backed $ Mortgage-backed Mortgage-backed Student Loan Mortgage-backed Net Par Outstanding % of Total Net Par Outstanding 1,636 1,555 997 994 971 2.6% 2.5% 1.6% 1.6% 1.5% The table below shows Ambac’s ten largest structured finance transactions, as a percentage of total financial guarantee net par outstanding at December 31, 2017: ($ in millions) Ballantyne Re Plc (2) Progress Energy Carolinas, Inc. Bond Type Structured Insurance Investor Owned Utility Wachovia Asset Securitization Issuance II, LLC 2007-HE2 Mortgage Backed Securities Timberlake Financial, LLC Structured Insurance Wachovia Asset Securitization Issuance II, LLC 2007-HE1 Mortgage Backed Securities Consolidated Edison Company of New York Investor Owned Utility Option One Mortgage Loan Trust 2007-FXD1 Mortgage Backed Securities CenterPoint Energy Inc. Niagara Mohawk Power Corporation Duke Energy Ohio, Inc. Total Investor Owned Utility Investor Owned Utility Investor Owned Utility Ambac Rating(1) Net Par Outstanding % of Total Net Par Outstanding $ BIG A- BIG BBB BIG A BIG BBB+ A BBB+ 900 558 547 520 381 347 289 276 257 255 $ 4,330 1.4 % 0.9 % 0.9 % 0.8 % 0.6 % 0.6 % 0.5 % 0.4 % 0.4 % 0.4 % 6.9% (1) Internal credit ratings are provided solely to indicate the underlying credit quality of guaranteed obligations based on the view of Ambac Assurance, and for Ambac UK related transactions, based on the view of Ambac UK. In cases where Ambac Assurance or Ambac UK has insured multiple tranches of an issue with varying internal ratings, or more than one obligation of an issuer with varying internal ratings, a weighted average rating is used. Ambac Assurance and Ambac UK credit ratings are subject to revision at any time and do not constitute investment advice. BIG denotes credits deemed below investment grade. (2) Insurance policy issued by Ambac UK. International Finance Insured Portfolio Ambac’s portfolio of international finance insured exposures is $16,812 million, representing 27% of Ambac’s net par outstanding as of December 31, 2017 and a 3% reduction from the amount outstanding at December 31, 2016. This reduction in exposure was primarily the result of policy terminations within investor-owned utilities and asset-backed securities partially offset by the weakening of the US dollar. Ambac’s international finance insured exposures include a wide array of obligations in the international markets, including infrastructure financings, asset-securitizations, utility obligations and whole business securitizations (e.g., securitizations of substantially all of the operating assets of a corporation). Ambac has no insured exposure related to emerging markets. See Note 6. Financial Guarantees in Force to the Consolidated Financial Statements, included in Part II, Item 8 included in this Form 10-K, for exposures by bond type as of December 31, 2017. Other European Union Exposures (“EU”) When underwriting transactions in the international markets, Ambac considered the specific risks related to the particular country and region that could impact the credit of the issuer. These risks include the legal and political environment, capital markets dynamics, foreign exchange issues and the degree of governmental support. Ambac continues to assess these risks through its ongoing risk management. Ambac UK, which is regulated in the United Kingdom (“UK”), had been Ambac Assurance’s primary vehicle for directly issuing financial guarantee policies in the UK and the European Union with $15,881 million net par outstanding in those markets at December 31, 2017. The portfolio of insured exposures underwritten by Ambac UK is financially supported exclusively by the assets of Ambac UK and no capital support arrangements are in place with any other Ambac affiliate. Ambac's international exposures are principally in the United Kingdom; however, we also have exposures with credit risk based in various other EU member states, including Austria, France, Germany, Italy and Spain. Several of these countries have experienced significant economic, fiscal and/or political strains such that the likelihood of default on such obligations is higher than when the policies were underwritten. The Company’s exposures, net of reinsurance, to these countries are shown in the following table: | Ambac Financial Group, Inc. 44 2017 FORM 10-K | ($ in millions) Sub-sovereign Infrastructure / operating asset backed Investor-owned utility Total Total below investment grade Austria France Germany Italy Spain Total $ $ $ — $ 29 $ — $ 817 $ — $ 770 — 770 770 $ $ 300 — 329 $ — $ — 39 39 39 $ $ 60 — 877 $ — $ — 41 41 41 $ $ 846 1,130 80 2,056 850 Ambac does not guarantee any sovereign bonds of the above EU countries. However, the exposures classified as sub-sovereign may be impacted should there be adverse financial developments in the EU. Those exposures classified as infrastructure/operating asset backed are concession based where the underlying assets independently generate cash flow without operational reliance on the sovereign. Of the below investment grade exposures, the investor-owned utilities (wind farm and mini hydro-electric plant) are either undergoing restructuring processes designed to address their performance issues (in the case of mini hydro-electric plant) or have already been the subject of restructuring processes to mitigate performance issues (wind farm). The other below investment grade exposure transaction, where performance has been poorer than anticipated due to lower than forecast traffic volumes, however, performance is improving. Below investment grade is defined as those exposures with a credit rating below BBB-. is a road Brexit: In a non-binding referendum on the United Kingdom’s (“UK”) membership in the European Union (“EU”) in June 2016, a majority of those who voted approved the UK’s withdrawal from the EU. As a result of the referendum, in March 2017 the UK government gave the EU formal notification of its intent to leave with the expectation of a formal withdrawal two years later on March 29, 2019. Also, in March 2017 the UK began initial (or phase one) negotiations with the EU regarding the terms of its departure (“Brexit”). On December 8, 2017, the EU and UK jointly announced, as set out in the Joint Report and Commission Communication of 8 December (“Joint Report”), that “sufficient progress” in phase one of the separation negotiations between the parties had been made to permit Brexit negotiations to move on to a more detailed phase two beginning in January 2018. If no transitional arrangements or new agreement are put into place, Brexit will mean that the activities in the EEA of UK passporting insurers will become unlawful on March 29, 2019. They will lose their legal authorization to serve clients who benefit from policies issued by a UK incorporated insurer under freedom of services passporting rights (and thereby maybe unable to legally collect premiums or pay claims) and if they have branches in EEA Member States they may be legally obliged to close them down and no longer be legally represented in those jurisdictions. In addition to the direct impact on insurers cited above, general uncertainty and the perceptions as to the ultimate impact of Brexit may adversely affect business activity, political stability and economic conditions in the UK, the Eurozone, the EU and elsewhere. The economic outlook could be further adversely affected by (i) the risk that one or more other EU countries could come under increasing pressure to leave the EU, (ii) the risk of a greater demand for independence by Scottish nationalists or for unification in Ireland and its impact on the United Kingdom, or (iii) the risk that the Euro as the single currency of the Eurozone could cease to exist. Any of these developments, or the perception that any of these developments are likely to occur, could have a material adverse effect on economic growth or business activity in the UK, the Eurozone, and/or the EU, and could result in the relocation of businesses, cause business interruptions, lead to economic recession or depression, and impact the stability of the financial markets, the availability of credit, political systems or financial institutions and the financial and monetary system. The table below shows our ten largest international finance transactions as a percentage of total financial guarantee net par outstanding at December 31, 2017. Except where noted, all international finance transactions included in the table below are insured by Ambac UK: ($ in millions) Country-Bond Type Ambac Rating(1) Net Par Outstanding % of Total Net Par Outstanding Mitchells & Butlers Finance plc-UK Pub Securitisation UK-Asset Securitizations National Grid Electricity Transmission Aspire Defence Finance plc Capital Hospitals plc (2) Posillipo Finance II S.r.l Anglian Water Ostregion Investmentgesellschaft NR 1 SA (2) Telereal Securitisation plc National Grid Gas RMPA Services plc Total UK-Utility UK-Infrastructure UK-Infrastructure Italy-Sub-Sovereign UK-Utility Austria-Infrastructure UK-Asset Securitizations UK-Utility UK-Infrastructure A+ A- BBB+ A- BBB- A- BIG AA A- BBB+ $ 1,475 1,135 928 922 817 793 770 766 732 621 2.4 % 1.8 % 1.5 % 1.5 % 1.3 % 1.3 % 1.2 % 1.2 % 1.2 % 1.0 % $ 8,959 14.3% (1) Internal credit ratings are provided solely to indicate the underlying credit quality of guaranteed obligations based on the view of Ambac Assurance, and for Ambac UK related transactions, based on the view of Ambac UK. In cases where Ambac Assurance or Ambac UK has insured multiple tranches of | Ambac Financial Group, Inc. 45 2017 FORM 10-K | an issue with varying internal ratings, or more than one obligation of an issuer with varying internal ratings, a weighted average rating is used. Ambac Assurance and Ambac UK credit ratings are subject to revision at any time and do not constitute investment advice. BIG denotes credits deemed below investment grade. (2) A portion of this transaction is insured by an insurance policy issued by Ambac Assurance. Additional Insured Portfolio Information Average Life of Insured Portfolio Ambac underwrote and priced financial guarantees based on the assumption that the guarantees would remain in force until the maturity of the underlying bonds. Ambac estimates that the average life of its guarantees on par in force at December 31, 2017 is approximately 10 years. The average life is determined by applying a weighted average calculation, using the remaining years to expected maturity of each guaranteed bond, and weighting them on the basis of the remaining net par guaranteed. Except for RMBS policies, no assumptions are made for non-contractual reductions, refundings or terminations of insured issues. RMBS policies incorporate assumptions on expected voluntary and involuntary prepayments over the remaining life of the insured obligation. The table below depicts amortization of existing guaranteed net par outstanding: Net Par Outstanding Amortization (1) ($ in millions) Estimated Net Amortization 2018 2019 2020 2021 2022 2018-2022 2023-2027 2028-2032 2033-2037 After 2037 Total $ $ $ 5,352 4,117 4,074 4,001 3,742 21,286 12,952 10,298 11,615 6,565 62,716 (1) Depicts amortization of existing guaranteed portfolio, assuming no advance refundings, as of December 31, 2017. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay guaranteed obligations. | Ambac Financial Group, Inc. 46 2017 FORM 10-K | Geographic Area Ratings Distribution The following table sets forth the geographic distribution of Ambac's existing guaranteed net par outstanding as of December 31, 2017: Geographic Area ($ in millions) Domestic: Net Par Amount Outstanding % of Total Net Par Amount Outstanding Mortgage and asset-backed (1) $ California New York New Jersey Colorado Florida Puerto Rico Texas Illinois Massachusetts Pennsylvania Other domestic Total Domestic International: United Kingdom Italy Austria Australia France Internationally diversified (2) Other international Total International Finance Total 7,710 6,351 3,658 3,237 2,537 1,992 1,968 1,890 1,668 1,412 1,316 12,165 45,904 12.3 % 10.1 % 5.8 % 5.2 % 4.0 % 3.2 % 3.1 % 3.0 % 2.7 % 2.3 % 2.1 % 19.4 % 73.2 % 877 770 608 329 368 306 16,812 62,716 $ 1.4 % 1.2 % 1.0 % 0.5 % 0.6 % 0.5 % 26.8 % 100.0% (1) Mortgage and asset-backed obligations includes guarantees with multiple locations of risk within the United States and is primarily comprised of residential mortgage and commercial asset-backed securitizations. The following tables provide a rating distribution of existing net par outstanding based upon internal Ambac credit ratings at December 31, 2017 and 2016 and a distribution by bond type of Ambac's below investment grade net par exposures at December 31, 2017 and 2016. Below investment grade is defined as those exposures with an internal credit rating below BBB-: December 31, Ambac Rating(1) AAA AA A BBB BIG Total 2017 2016 <1% <1% 10 37 31 22 13 39 27 21 100% 100% (1) Internal credit ratings are provided solely to indicate the underlying credit quality of guaranteed obligations based on the view of Ambac Assurance, and for Ambac UK related transactions, based on the view of Ambac UK. In cases where Ambac Assurance or Ambac UK has insured multiple tranches of an issue with varying internal ratings, or more than one obligation of an issuer with varying internal ratings, a weighted average rating is used. Ambac Assurance and Ambac UK credit ratings are subject to revision at any time and do not constitute investment advice. Bond Type ($ in millions) Public Finance: Lease and tax-backed (1) General obligation (1) Transportation Housing (2) Health care Other Net Par Outstanding - December 31, 2017 2016 $ 2,144 $ 2,145 491 397 317 24 189 681 415 125 29 775 Total Public Finance 3,562 4,170 13,554 21.6 % Summary of Below Investment Grade Exposure: (2) Internationally diversified may include components of U.S. Structured Finance: exposure. Exposure Currency The table below shows the distribution by currency of Ambac's existing guaranteed net par outstanding as of December 31, 2017: Currency ($ in millions) U.S. Dollars British Pounds Euros Australian Dollars A$ New Zealand Dollars NZ$ Net Par Amount Outstanding in Base Currency Net Par Amount Outstanding in U.S. Dollars Percentage of Net Par Amount Outstanding $ £ € 46,640 $ 9,811 1,688 779 252 46,640 13,262 2,027 608 179 74.4 % 21.1 % 3.2 % 1.0 % 0.3 % Total $ 62,716 100.0% Residential mortgage-backed and home equity—first lien Residential mortgage-backed and home equity—second lien Student loans Structured Insurance Mortgage-backed and home equity—other Other Total Structured Finance International Finance: Other Total International Finance 3,947 2,803 922 900 166 9 5,163 3,483 991 900 251 304 8,747 11,092 1,200 1,200 1,562 1,562 Total $ 13,509 $ 16,824 (1) Tax-backed includes $1,802 and $1,871 of Puerto Rico net par at December 31, 2017 and 2016, respectively. General obligation includes $166 and $187 of Puerto Rico net par at December 31, 2017 and 2016, respectively. Puerto Rico net par outstanding includes | Ambac Financial Group, Inc. 47 2017 FORM 10-K | capital appreciation bonds which are reported at the par amount at the time of issuance of the related insurance policy as opposed to the current accreted value of the bonds. (2) Includes $317 and $125 of military housing net par at December 31, 2017 and 2016, respectively. The decrease in below investment grade exposures is primarily due to (i) upgrades of several public finance transactions, primarily stadiums, in addition to runoff including commutations and claims paid by Ambac Assurance, partially offset by a military housing downgrade, (ii) reductions to residential mortgage-backed securities during the year as a result of prepayments by issuers, commutations and claims presented to Ambac Assurance, (iii) cancellation of certain asset backed bonds and (iv) the termination of an international CDO transaction. Despite the decrease in below investment grade net par, such exposure increased in relative proportion to the aggregate insured portfolio to 22% at December 31, 2017, compared to 21% at December 31, 2016. Based on our experience, below investment grade exposures typically run-off at a slower pace than investment grade exposures and therefore Ambac is subject to the risk that its insured portfolio will increasingly become concentrated in higher risk below investment grade exposures. This risk may result in greater volatility in our results from operations and have adverse effects on our financial condition. U.S. residential mortgage-backed securities exposure Ambac has exposure to the U.S. mortgage market primarily through direct financial guarantees of RMBS, including transactions that contain risks to first and second liens. The following tables provide, by vintage and type current net par outstanding of Ambac’s U.S. RMBS book of business: December 31, 2017 December 31, 2016 Year of Issue ($ in millions) 1998-2001 2002 2003 2004 2005 2006 2007 Total Second Lien $ 2 1 3 223 305 1,124 1,149 $ 300 107 151 130 493 325 289 First- lien Sub- prime First- lien Mid- prime Other(1) Total $ — $ 126 $ $ First- lien Sub- prime 344 291 411 245 572 379 311 $ First- lien Mid- prime 1 26 154 271 1,028 523 868 Second Lien $ 5 2 6 321 402 1,340 1,415 428 129 273 570 1,702 1,929 2,236 Other(1) Total $ 169 $ 519 322 651 838 2,040 2,297 2,716 3 80 1 38 55 122 468 21 119 217 872 434 694 — — — 32 46 104 308 $ 2,807 $ 1,795 $ 2,357 $ $ 7,267 $ 3,491 $ 2,553 $ 2,871 $ $ 9,383 % of Total RMBS Portfolio 38.6% 24.7% 32.4% 4.3% 100.0% 37.2% 27.2% 30.6% 5.0% 100.0% % of Related Par Outstanding rated below investment grade (2) 99.9% 92.7% 96.3% 57.7% 95.2% 99.8% 93.4% 96.2% 57.2% 94.8% (1) Other primarily includes manufactured housing and lot loan exposures (2) Ambac’s below investment grade internal ratings reflect bonds which are of speculative grade credit quality with the adequacy of future margin levels for payment of interest and repayment of principal potentially adversely affected by major ongoing uncertainties or exposure to adverse conditions. Ambac Assurance’s below investment grade category includes transactions on which claims have been submitted. Auction Rate Securities (“ARS”) and Variable Rate Demand Obligations (“VRDO”): Ambac insures variable rate obligations including ARS and VRDOs, both of which have rate resets and may have experienced liquidity and/or credit stress during the financial crisis. While market conditions have improved and most of Ambac’s exposures have stabilized or been refinanced away, there are still some issuers paying higher rates, and in the case of some VRDOs, both higher rates and faster amortization than expected due to failed remarketings. Many of Ambac’s ARS exposures are paying at failed auction rates that are relatively low in the current market and remain attractive to issuers. The following table sets forth Ambac Assurance’s financial guarantee net par exposure outstanding, by bond type, relating to such variable rate exposures at December 31, 2017 and 2016: ($ in millions) December 31, 2017 2016 Investor-owned utilities $ 1,549 $ 1,780 Healthcare Student loans Lease and tax-backed Utility Transportation General Obligation Other Total 423 316 262 251 205 43 251 449 361 305 293 207 46 274 $ 3,300 $ 3,715 | Ambac Financial Group, Inc. 48 2017 FORM 10-K | Reinsurance Ceded Reinsurance: Ambac Assurance has reinsurance in place pursuant to surplus share treaties and facultative agreements. As a primary financial guarantor, Ambac Assurance is required to honor its obligations to its policyholders whether or not its reinsurers perform their obligations under these reinsurance agreements. For exposures reinsured, Ambac Assurance withholds a ceding commission to defray its underwriting and operating expenses. To minimize its exposure to losses from reinsurers, Ambac Assurance (i) monitors the financial condition of its reinsurers; (ii) is entitled to receive collateral from its reinsurance counterparties in certain reinsurance contracts; and (iii) has certain cancellation rights that can be exercised by Ambac Assurance in the event of rating agency downgrades of a (among other events and circumstances). Ambac Assurance held letters of credit and collateral amounting to $115.6 million from its reinsurers at December 31, 2017. As of December 31, 2017, the aggregate amount of insured par ceded by Ambac Assurance to reinsurers under reinsurance agreements was $4,424 million, with the largest reinsurer accounting for $3,668 million or 5.5% of gross par outstanding at December 31, 2017. reinsurer The following table shows the distribution, by bond type, of Ambac Assurance’s ceded guaranteed portfolio at December 31, 2017: Bond Type ($ in millions) Public Finance: Housing revenue General obligation Lease and tax-backed revenue Transportation revenue Higher education Utility revenue Health care revenue Other Total Public Finance Structured Finance: Student loan Investor-owned utilities Mortgage-backed and home equity Asset-backed Other Total Structured Finance Total Domestic International Finance: Investor-owned and public utilities Transportation Asset-backed Total International Finance Total $ Assumed Reinsurance: Ceded Par Amount Outstanding % of Gross Par Ceded $ 968 837 719 221 131 86 46 104 3,112 438 414 87 42 192 1,173 4,285 98 25 16 139 4,424 13 % 12 % 6 % 10 % 7 % 4 % 5 % 12 % 9 % 26 % 11 % 1 % 9 % 12 % 8 % 9 % 2 % 2 % 1 % 1 % 7% At December 31, 2017, assumed par outstanding was $219.1 million. | Ambac Financial Group, Inc. 49 2017 FORM 10-K | ($ in millions) Year Ended December 31, 2017 2016 2015 RESULTS OF OPERATIONS Revenues: Net premiums earned Net investment income Net other-than-temporary impairment losses Net realized investment gains Change in fair value of credit derivatives Net gains (losses) on interest rate derivatives Other income (expense) Income (loss) on variable interest entities Expenses: Losses and loss expenses (benefit) Insurance intangible amortization Operating expenses Interest expense Goodwill impairment Provision for income taxes Less: Net income attributable to the noncontrolling interest $ 175.3 $ 197.3 $ 361.0 (20.2) 5.4 16.4 59.6 (0.7) 19.7 513.2 150.9 121.5 119.9 — 44.5 — 313.4 (21.8) 39.3 20.1 (50.3) 17.4 (14.1) (11.5) 174.6 113.7 124.3 — 30.7 (0.5) Net income (attributable to common shareholders) $ (328.7) $ 74.8 $ 312.6 266.3 (25.7) 53.5 41.7 (42.5) 7.2 31.6 (768.7) 169.6 102.7 116.5 514.5 17.4 (0.7) 493.4 The following paragraphs describe the consolidated results of operations of Ambac and subsidiaries for 2017, 2016 and 2015 and its financial condition as of December 31, 2017 and 2016. Net Premiums Earned. Net premiums earned primarily represent the amortization into income of insurance premiums. Net premiums earned for the year ended December 31, 2017, decreased by $22.0 million or 11.2% as compared to net premiums earned for the year ended December 31, 2016. Net premiums earned for the year ended December 31, 2016, decreased by $115.3 million or 36.9% as compared to net premiums earned for the year ended December 31, 2015. We present accelerated premiums, which result from calls and other accelerations of insured obligations separate from normal net premiums earned. When an insured bond has been retired, any remaining unearned premium revenue ("UPR") is recognized at that time to the extent the financial guarantee contract is legally revenue. For extinguished, causing accelerated premium installment premium paying transactions, we offset the recognition of any remaining UPR by the reduction of the related premium receivable to zero (as it will not be collected as a result of the retirement), which may cause negative accelerated premium revenue. Included within accelerated premiums, were negative accelerations of $0.4 million, $7.6 million, and $5.1 million, for the years ended December 31, 2017, 2016 and 2015, respectively. Normal net premiums earned are impacted by the following: • The runoff of the insured portfolio occurring through transaction terminations, calls and scheduled maturities, which had a negative impact. • Changes in the collectability of certain Structured Finance premium receivables resulted in an increase in net premiums earned of $0.3 million, $0.8 million and $0.5 million for the years ended December 31, 2017, 2016 and 2015, respectively. Changes in the collectability of a certain International Finance premium receivable resulted in a decrease in net premiums earned of $0.4 million for the year ended December 31, 2017. • Pre-refundings of insured securities, primarily Public Finance transactions. Since the maturity date of pre-refunded securities is shortened (to a specified call date from its previous legal maturity), normal net premiums earned will increase over the remaining period of the related policy. • The strengthening or weakening of the U.S. dollar relative to the British Pound since Ambac's wholly-owned UK subsidiary, Ambac UK, operates in the United Kingdom and the British Pound is its functional currency. Normal net premiums earned and accelerated premiums are reconciled to total net premiums earned in the table below, including a breakdown of net premiums earned by market: ($ in millions) Year Ended December 31, 2017 2016 2015 Public finance Structured finance International finance Total normal premiums earned Public Finance Structured Finance International Finance Accelerated earnings $ $ $ $ 62.4 21.7 26.7 110.8 46.7 3.3 14.5 64.5 Total net premiums earned $ 175.3 $ $ $ $ $ 84.8 27.7 32.4 144.9 52.5 3.6 (3.7) 52.4 197.3 $ $ $ $ $ 97.1 34.2 43.9 175.2 97.3 1.1 39.0 137.4 312.6 Net Investment Income. Net investment income primarily consists of interest receipts and net discount accretion on fixed | Ambac Financial Group, Inc. 50 2017 FORM 10-K | income securities classified as available-for-sale, including $262.1 million, $195.4 million and $175.2 million in 2017, 2016 and 2015, respectively related to investments in Ambac-insured securities. Also, included in net investment income are net mark-to-market gains of $18.2 million, $27.7 million and $12.6 million in years ended 2017, 2016 and 2015, respectively, arising from pooled fund investments and certain other investments that are classified as trading securities with changes in market value recognized in earnings. Most trading securities are in the Ambac UK portfolio and consist of pooled fund investments in diversified asset classes including equities, hedge funds, loans, insurance-linked securities and property. Ambac Assurance has also invested in loan funds as part of its overall portfolio allocation strategy. In 2017, Ambac invested in debt instruments issued by Corolla Trust. Refer to Note 3. Special Purpose Entities, Including Variable Interest Entities to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K, for more information on the Corolla Trust. Net investment income increased $47.5 million for the year ended December 31, 2017 compared to 2016 and $47.2 million for the year ended December 31, 2016 compared to 2015. The increase in income in 2017 is primarily due to greater allocation to higher- yielding Ambac-insured securities, partially offset by lower net gains on trading securities, Investment income on Ambac-insured securities increased $66.7 million in 2017 compared to 2016, including $40.9 million related to RMBS securities driven primarily by reprojected cash flows for the restructuring of deferred claims included in the Rehabilitation Exit Transactions completed in the first quarter of 2018. Income from Ambac- insured securities also reflects additional purchases of Puerto Rico bonds over the course of 2017 and additional purchases by Ambac UK of its insured bonds. Net income from trading securities declined in 2017 primarily due to catastrophe-driven losses on insurance-linked securities and lower returns on loans and equities, net of foreign exchange effects. The strengthening British pound sterling relative to the U.S. dollar in 2017 partially offset strong equity market gains in Ambac UK's pooled fund holdings. This compares to 2016 when the pound declined. The increase net investment income in 2016 is attributable to growth in the size of the portfolio and higher average returns.The larger portfolio in 2016 primarily resulted from the receipt of $995 million in January 2016 in connection with a representation and warranty settlement with JP Morgan. Higher average portfolio returns in 2016 reflect higher allocations to Ambac insured RMBS, other securities guaranteed by Ambac Assurance or Ambac UK and pooled funds. Net investment income from pooled funds in 2016 increased $15.1 million from 2015, due primarily to new investments in high-yield loan funds which performed well during the year and stronger returns in equity markets and asset backed strategies, partially offset by lower gains from property and hedge funds. Net investment income will be significantly impacted in future periods as a result of the Rehabilitation Exit Transactions as further described in Note 1. Background and Business Description and Note 17. Subsequent Events of the Consolidated Financial Statements in Part II, Item 8 of this Form 10-K. See also the Pro Forma Balance Sheet section included in Part II, Item 7 of this Form 10-K. Net Other-Than-Temporary Impairment Losses. Net other-than- temporary impairment losses recorded in earnings include only credit related impairment amounts on securities to the extent management does not intend to sell and it is not more likely than not that the Company will be required to sell before recovery of the amortized cost basis. Non-credit related impairment amounts are recorded in other comprehensive income. Alternatively, non- credit related impairment is reported through earnings as part of net other-than-temporary impairment losses if management intends to sell securities or it is more likely than not that the Company will be required to sell before recovery of amortized cost less any current period credit impairment. Ambac's other-than-temporary impairments for the years ended December 31, 2017, 2016 and 2015 related to credit losses on certain Ambac-wrapped securities stemming primarily from cash flow projections and to the company’s intent to sell certain securities that were in an unrealized loss position as of the impairment evaluation dates. During the Segregated Account Rehabilitation Proceedings, changes in the estimated timing of claim payments resulted in adverse changes in projected cash flows on certain impaired Ambac-wrapped securities. Ambac estimated the timing of such claim payment receipts, but the actual timing of such payments were at the sole discretion of the Rehabilitator. Refer to Note 1. Background and Business Description to the Consolidated Financial Statements for more information on the Segregated Account and the Segregated Account Rehabilitation Proceedings. Ambac’s assessment about whether a decline in value is other- than-temporary reflects management’s current judgment regarding facts and circumstances specific to a security and the factors noted above, including Ambac's intention to sell securities and ability to hold temporarily impaired securities until recovery. If that judgment changes, Ambac may ultimately record a charge for other-than-temporary impairment in future periods. Net Realized Investment Gains. The following table provides a breakdown of net realized gains, for the periods presented: ($ in millions) Year Ended December 31, 2017 2016 2015 Net gains on securities sold or called Foreign exchange gains (losses) Total net realized gains $ $ 10.1 $ 9.1 $ 47.7 (4.7) 5.4 $ 30.2 39.3 $ 5.8 53.5 Net gains during the year ended December 31, 2017 included the impact of sales of securities to fund the February 12, 2018 Rehabilitation Exit Transactions as further described in Note 1. Background and Business Description of the Consolidated Financial Statements in Part II, Item 8 of this Form 10-K. Net gains during the year ended December 31, 2016 included foreign exchange related gains of $22.7 million on short-term and trading securities held by Ambac UK and denominated in non-functional currencies (primarily US dollars and euros) and $8.3 million of realized currency gains related to available-for-sale securities that were sold by Ambac UK during the year. Net gains during year ended December 31, 2015 arose primarily from the sale of Ambac insured student loan securities in connection with a financial guarantee commutation transaction. | Ambac Financial Group, Inc. 51 2017 FORM 10-K | Change in Fair Value of Credit Derivatives. The gain from change in fair value of credit derivatives for the year ended December 31, 2017 was $16.4 million, as compared to the gains of $20.1 million and $41.7 million for the years ended December 31, 2017, 2016 and 2015, respectively. The gain for 2017 was mainly due to the reversal of unrealized losses from swap terminations, including the remaining adversely classified credit in the portfolio, in addition to reference obligation price improvements. The gain for 2016 reflects increased pricing levels and a stronger credit assessment on an adversely classified credit in the portfolio, partially offset by the impact of lower Ambac CVA discount rates. The gain for 2015 was primarily due to the reversal of unrealized losses on adversely classified student loan credit default swaps in connection with termination of the contracts in addition to the positive impacts of other portfolio runoff, currency exchange rates and higher Ambac CVA discount rates. Realized gains and other settlements on credit derivative contracts represent premiums received and accrued on such contracts including termination fees. Realized gains and other settlements were $1.6 million, $0.9 million and $2.8 million for 2017, 2016 and 2015, respectively. Included in realized gains and other settlements on credit derivatives were fees received in connection with transaction terminations of $1.0 million, $0.0 million and $1.3 million for the years 2017, 2016 and 2015, respectively. Excluding the impact of termination fees, the declines over time are due to continued runoff of the credit derivative portfolio.There were no loss or settlement payments in the periods presented. Unrealized gains (losses) on credit derivative contract reflect the impact of all other factors on the overall change in fair value of credit derivatives noted above. See Note 9. Fair Value Measurements to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for a further description of Ambac’s methodology for determining the fair value of credit derivatives. The table below indicates the impact of incorporating Ambac’s own credit risk into the fair value of credit derivatives as of December 31, 2017 and 2016: ($ in millions) December 31, 2017 2016 Mark-to-market liability of credit derivatives, excluding CVA CVA on credit derivatives Credit derivative liability at fair value $ $ 0.7 (0.1) 0.6 $ $ 17.2 (1.9) 15.3 Net Gain (Loss) on Interest Rate Derivatives. The interest rate derivatives portfolio is positioned to benefit from rising rates as a partial economic hedge against interest rate exposure in the financial guarantee and investment portfolios. Results in Net gain (loss) on interest rate derivatives generally reflect mark-to-market gains (losses) in the portfolio caused by increases (declines) in forward interest rates during the periods, the carrying cost of the net liability position of the portfolio, and the impact of the Ambac CVA and counterparty credit adjustments as discussed below. Net gains for the year ended December 31, 2017 were $59.6 million, reflecting an improvement of $109.8 million as compared to the net losses of $50.3 million for the year ended December 31, 2016. The net gain for 2017 was primarily driven by the June 2017 commutation of interest rate swaps with a structured finance vehicle counterparty (the "Augusta swaps"). The net gains (losses) on these swaps were $42.2 million for the year ended December 31, 2017. Results for 2017 also included gains from rising interest rates and lower counterparty credit adjustments on certain uncollateralized derivative assets, Net losses reported in interest rate derivatives for the year ended December 31, 2016 were $50.3 million, a deterioration of $7.7 million as compared to net losses of $42.5 million for the year ended December 31, 2015. The interest rate derivatives loss for 2016 was primarily driven by the impact lower credit spreads that reduced the Ambac CVA on derivative liabilities and the carrying cost of the portfolio. Despite substantial interest rate movements within 2016, the overall change in rates from the beginning to the end of the year did not have a significant impact on full year results. Results for 2015 reflect mark-to-market losses caused by declines in forward interest rates, net of the impact of the Ambac CVA as discussed below. Additionally, counterparty credit valuation adjustments on certain interest rate swap assets increased the overall mark-to-market losses for 2015. The fair value of derivatives include valuation adjustments to reflect Ambac’s own credit risk and counterparty credit risk. Within the interest rate derivatives portfolio, an Ambac CVA is generally applicable for uncollateralized derivative liabilities that may not be offset by derivative assets under a master netting agreement. For the periods presented, an Ambac CVA was applicable only to the Augusta swaps that were terminated in June 2017 as discussed above. Changes in the Ambac CVA on Augusta swaps is included in the 2017 net gains from Augusta swaps described above. Inclusion of the Ambac CVA in the valuation of interest rate derivatives contributed (losses) gains of $(33.8) million and $14.2 million in 2016 and 2015, respectively. Counterparty credit adjustments are generally applicable for uncollateralized derivative assets that may not be offset by derivative liabilities under a master netting agreement. Inclusion of counterparty credit adjustments in the valuation of interest rate derivatives resulted in gains (losses) within Net gain (loss) on interest rate derivatives of $4.1 million, $2.5 million and $(17.6) million for 2017, 2016 and 2015, respectively. The table below indicates the impact of incorporating Ambac’s own credit risk into the fair value of the derivative portfolio (excluding credit derivatives) as of December 31, 2017 and 2016: ($ in millions) December 31, 2017 2016 Interest rate derivatives mark-to-market liability, excluding CVA CVA on interest rate derivatives portfolio Interest rate derivatives portfolio liability at fair value $ $ 82.2 $ 348.8 — (44.9) 82.2 $ 303.9 Net Realized Gains (Losses) on Extinguishment of Debt. Net realized gains on extinguishment of debt was $4.9 million for the year ended December 31, 2017, compared to gains of $4.8 million and $0.1 million for the years ended December 31, 2016 and 2015, respectively. The gains for the years ended December 31, 2017 and 2016 included gains from the settlements of purchased surplus notes below their carrying values and gains from the settlements of certain residual obligations related to previously called surplus notes. The gains for the year ended December 31, 2015 included gains from the settlement of certain residual obligations related to previously called surplus notes, partially offset by losses from settlement of an investment agreement above its carrying value | Ambac Financial Group, Inc. 52 2017 FORM 10-K | and the accelerated recognition of the unamortized discount on surplus notes purchased during the year. Other Income. The table below summarizes other income. ($ in millions) Year Ended December 31, 2017 2016 2015 Foreign exchange gain/(loss) $ (2.6) $ Other 1.9 7.8 9.7 Total other income (loss) $ (0.7) $ 17.4 $ $ (2.0) 9.2 7.2 Foreign exchange gains/(losses) are unrelated to investments or loss reserves but include gains/(losses) relating to foreign currency changes on present value of premium receivables denominated in a subsidiary's non-functional currency, in addition to foreign exchange gains/(losses) on cash. Other includes various fees, primarily consent and waiver fees. In 2017, income from such fees is partially offset by charges in connection with the Rehabilitation Exit Transactions (as defined in Note 1. Background and Business Description to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K). In addition to various fees for the year ended December 31, 2016 other includes insurance recoveries on a partially cancelled asset-backed transaction which is consolidated as a VIE, interest recoveries related to previously paid legal fees related to a disputed premium receivable partially offset by a loss mitigation payment on an international investor- owned utility transaction which is consolidated as a VIE. Income (loss) on Variable Interest Entities. Included within Income (loss) on variable interest entities are income statement amounts relating to VIEs consolidated under the Consolidation Topic of the ASC as a result of Ambac's variable interest arising from financial guarantees written by Ambac's subsidiaries, including gains or losses attributable to consolidating or deconsolidating VIEs during the periods reported. Generally, the Company’s consolidated VIEs are entities for which Ambac has provided financial guarantees on all of or a portion of its assets or liabilities. In consolidation, assets and liabilities of the VIEs are reported at fair value and the related insurance assets and liabilities are eliminated. However, the amount of VIE net assets (liabilities) that remain in consolidation generally result from the net positive (negative) present value of projected cash flows from (to) the VIEs which are attributable to Ambac’s insurance subsidiaries in the form of financial guarantee insurance premiums, fees and losses. In the case of VIEs with net negative projected cash flows, the net liability is generally to be funded by Ambac’s insurance subsidiaries through insurance claim payments. Differences between the net carrying value of the insurance accounts under the Financial Services—Insurance Topic of the ASC and the carrying value of the consolidated VIE’s net assets or liabilities are recorded through income at the time of consolidation or deconsolidation. Income (loss) on variable interest entities was $19.7 million, $(14.1) million and $31.6 million for the years ended December 31, 2017, 2016 and 2015, respectively. Income on variable interest entities for year ended December 31, 2017 is due primarily to a higher net asset value of a VIE related to an increase in projected financial guarantee insurance premiums. Income (loss) on variable interest entities for the years ended December31, 2016 and 2015 reflected an increase (decrease) in the fair value of net assets primarily due to the increase (decrease) in the CVA applied to certain VIE note liabilities that include significant projected financial guarantee claims. Other than those transactions involving significant projected financial guarantee claims, the fair value of VIE net assets increased producing net gains in 2016 and 2015. Refer to Note 3. Special Purpose Entities, Including Variable Interest Entities to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for further information on the accounting for VIEs. Losses and Loss Expenses. Losses and loss expenses are based upon estimates of the aggregate losses inherent in the non- derivative financial guarantee portfolio for insurance policies issued to beneficiaries, including unconsolidated VIEs. Losses and loss expenses include interest on Deferred Amounts pursuant to the Segregated Account Rehabilitation Plan that were discharged on February 12, 2018. Ambac records as a component of its loss reserve estimate, subrogation recoveries related to securitized loans in RMBS transactions with respect to which Ambac Assurance is pursuing claims for breaches of representations and warranties described herein. Ambac does not include potential recoveries attributed solely to fraudulent inducement claims in our litigations in our estimate of subrogation recoveries. Generally, the sponsor of an RMBS transaction provided representations and warranties with respect to the securitized loans, including representations with respect to the loan characteristics, the absence of borrower fraud in the underlying loan pools or other misconduct in the origination process and attesting to the compliance of loans with the prevailing underwriting policies. Ambac has recorded representation and warranty subrogation recoveries, net of reinsurance, of $1.8 billion and $1.9 billion at December 31, 2017 and 2016, respectively. Refer to Note 2. Basis of Presentation and Significant Accounting Policies to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for more information regarding the estimation process for representation and warranty subrogation recoveries. Losses and loss expenses (benefit) for the year ended December 31, 2017, 2016 and 2015 were $513.2 million, $(11.5) million and $(768.7) million, respectively. The following table provides details, by bond type, for losses and loss expenses (benefit) incurred for the periods presented: ($ in millions) Year Ended December 31, RMBS (1) Domestic Public Finance Student Loans Ambac UK All other credits Interest on Deferred Amounts Totals (2) 2017 2016 2015 $ (40.8) $ (298.9) $ (721.1) 476.3 25.1 (128.3) 3.0 169.0 (111.9) 56.7 2.8 141.8 (251.1) (94.5) (5.7) 177.9 170.8 161.9 $ 513.2 $ (11.5) $ (768.7) (1) The loss and loss expense (benefit) associated with changes in estimated representation and warranties for the year ended December 31, 2017, 2016 and 2015 was $72.0, $(71.4), and $(303.6), respectively. (2) Includes loss expenses incurred of $81.6 million, $51.9 million and $32.8 million for the year ended December 31, 2017, 2016 and 2015, respectively. | Ambac Financial Group, Inc. 53 2017 FORM 10-K | Losses and loss expenses for 2017 were driven by the following: • Higher projected losses in domestic public finance largely driven by adverse development on Puerto Rico and the Military Housing sector; • Interest on deferred amounts; partially offset by; • Lower projected losses in the Ambac UK portfolio primarily due to the confidential settlement of litigation brought by Ambac UK in the name of Ballantyne against JPMIM and from activities executed by the Ballantyne trust that indirectly reduced future expected claims on the Ambac insured notes; • Foreign exchange gains of $28.9 million. A portion of Ambac UK's loss reserves are denominated in currencies other than its functional currency of British Pounds resulting in incurred losses the British Pound depreciates (appreciates); (gains) when • A $49.7 million benefit due to reimbursements of claims paid with respect to two transactions that benefited from a mortgage insurance settlement. Losses and loss expenses (benefit) for 2016 were driven by the following: • Lower projected losses in the RMBS portfolio due to improved deal performance, higher representation and warranty subrogation recoveries and a settlement of a non- representation and warranty dispute with regards to an Ambac insured RMBS transaction; • The positive impact of executed commutations and an improved outlook with regards to our risk remediation efforts on student loan policies primarily associated with student loan bonds acquired during 2016; partially offset by; • Higher projected losses in domestic public finance for the year ended December 31, 2016 largely driven by adverse development in Puerto Rico; • Interest on deferred amounts; • Increased projected losses in the Ambac UK portfolio for the year ended December 31, 2016 primarily due to foreign exchange losses of $77.6 million partially offset by lower interest rates. Losses and loss expenses (benefit) for 2015 were driven by the following: • Lower projected losses in the RMBS portfolio due to improved deal performance, lower interest rates and increases in our estimate of RMBS subrogation recoveries as a result of continuous efforts and ongoing assessments of the value of our claims; • The positive impact of executed commutations, an improved outlook with regards to our risk remediation efforts and lower interest rates on student loan policies; • Decrease in projected losses for the year ended December 31, 2015 due to reduced claim expectations for an Ambac UK transaction resulting from proactive remediation efforts and lower interest rates, partially offset by foreign exchange losses of $24.8 million; partially offset by; • Higher projected losses in domestic public finance for the year ended December 31, 2015 largely driven by adverse development in Puerto Rico; • Interest on deferred amounts. The following table provides details of net claims recorded, net of reinsurance for the affected periods: ($ in millions) Year Ended December 31, Claims recorded (1)(2)(3) Subrogation received (4) Net Claims Recorded 2017 2016 2015 $ $ 343.7 (244.0) 99.7 $ $ 391.9 $ 367.9 (1,355.4) (308.4) (963.5) $ 59.5 (1) Claims recorded include (i) claims paid, including commutation payments and (ii) changes to claims presented and not yet presented through the balance sheet date for policies which were allocated to the Segregated Account. Item (ii) includes permitted policy claims for policies allocated to the Segregated Account that were presented and approved by the Rehabilitator of the Segregated Account but not paid through to the balance sheet date in accordance with the Segregated Account Rehabilitation Plan and associated rules and guidelines. Amounts recorded for claims not yet presented and/or permitted are based on management’s judgment. Claims recorded exclude interest accrued on Deferred Amounts. (2) Claims recorded includes claims paid (including commutation payments) of $310.8, $365.5, and $345.0 for the year ended December 31, 2017, 2016 and 2015, respectively. (3) Claims recorded includes claims paid on Puerto Rico policies of $142.5, $63.3 and $0 for the year ended December 31, 2017, 2016 and 2015, respectively. (4) Subrogation received for the year ended December 31, 2017 includes $49.7 ($49.8 gross of reinsurance) related to a reimbursement of claims due to a mortgage insurance settlement. Subrogation received for the year ended December 31, 2016 includes $992.8 ($995 gross of reinsurance) received from the settlement of representation and warranty related litigation with JP Morgan and $99.1 ($100.3 gross of reinsurance) related to the Countrywide Investor Settlement. Operating Expenses. Operating expenses consist of gross operating expenses plus reinsurance commissions. The following table provides details of operating expenses for the periods presented: ($ in millions) Year Ended December 31, Gross operating expenses Reinsurance commissions, net Total operating expenses $ $ 2017 2016 2015 121.1 $ 112.1 $ 102.3 0.4 1.6 0.4 121.5 $ 113.7 $ 102.7 Gross operating expenses for the year ended December 31, 2017 are $121.1 million, an increase of $9.0 million from gross operating expenses for the year ended December 31, 2016. The increase was primarily due to the following: • Higher non-compensation costs primarily due to (i) $21.7 million incremental legal, consulting and advisory costs related to the Rehabilitation Exit Transactions, (ii) $5.3 million incremental OCI legal and consulting costs primarily | Ambac Financial Group, Inc. 54 2017 FORM 10-K | in connection with the Rehabilitation Exit Transactions, and (iii) $4.1 million increase in state taxes primarily due to a $2.3 million reduction of accrued state income taxes in 2016 due to the final resolution of state insurance tax assessments. These increased costs were partially offset by (i) a reduction in litigation contingencies of $8.5 million and (ii) a reduction in costs associated with stockholder activism of $5.9 million in 2016. • Lower compensation costs related to salaries, post employment costs, including severance, partially offset by increased long term incentive compensation costs due to an improvement in performance factors. Although post- employment costs have decreased from 2016, the Company reduced headcount in 2017 resulting in severance charges. These charges are lower than prior year due to 2016 including severance costs related to the former CEO. Gross operating expenses for the year ended December 31, 2016 are $112.1 million, an increase of $9.8 million from gross operating expenses for the year ended December 31, 2015. The increase was primarily due to the following: • Higher compensation costs related to severance and post employment costs, due to changes in CEO and reductions in staff partially offset by reduced salary and bonus expense. • Higher non-compensation costs related to stockholder activism, the establishment of $10.0 million of litigation contingencies, higher audit fees, increased outside services in non- and higher regulatory costs. The compensation costs were partially offset by reductions in premises costs and premium taxes. Costs associated with stockholder activism amounted to $5.9 million and include legal, consulting and outside services fees. increase As a consequence of the Segregated Account Rehabilitation Proceedings, the Rehabilitator retained operational control and decision-making authority with respect to all matters related to the Segregated Account, including the hiring of advisers. Legal and consulting services provided for the benefit of OCI amounted to $11.7 million, $6.4 million and $5.6 million for the years ended December 31, 2017, 2016 and 2015, respectively. The increase in 2017 compared to 2016 is driven by higher advisor fees primarily related to the Rehabilitation Exit Transactions. The increase in 2016 compared to 2015 is driven by an increase in monthly consulting adviser fees and higher legal fees as a result of a change in legal advisers. Subsequent to the Segregated Account's effective exit from rehabilitation, advisory services provided for the benefit of OCI will be reduced, although certain advisors will receive transaction or event based payments at the time of exit. Interest Expense. Interest expense includes accrued interest on surplus notes issued by Ambac Assurance and the Segregated Account, secured borrowing notes outstanding, investment agreements and fees on unfunded lending commitments. Additionally, interest expense includes discount accretion on surplus notes as their carrying value is at a discount to par. The following table provides details by type of obligation for the periods presented: ($ in millions) Year Ended December 31, 2017 2016 2015 Surplus notes $ 113.4 $ 118.5 $ 113.1 Investment agreements Secured borrowing Unfunded commitment fees 0.2 3.9 2.4 0.6 5.2 — 0.9 2.5 — Total interest expense $ 119.9 $ 124.3 $ 116.5 The decrease in interest expense for the year ended December 31, 2017, compared to 2016 primarily results from the impact of purchases of surplus notes during the first half of 2017 and reduced debt balances resulting from amortization of the secured borrowing notes outstanding. The decrease in interest expense was partially offset by the impact of applying the level yield method as the discount to the face value of the surplus note accretes over time. The year ended December 31, 2017 also includes commitment fees incurred for the Tier 2 Financing as part of the Rehabilitation Exit Transactions. Refer to Note 1. Background and Business Description to the Consolidated Financial Statements for information relating to the Rehabilitation Exit Transactions and Tier 2 Financing. The increase in interest expense on surplus notes for the year ended December 31, 2016, compared to 2015 primarily results from the impact of applying the level yield method as the discount to the face value of surplus notes accretes over time. The year ended December 31, 2016 also includes a full year of interest on the secured borrowing transaction of Ambac Assurance (issued in July 2015). Surplus note principal and interest payments require the approval of OCI. Annually from 2011 through 2017, OCI issued its disapproval of the requests of Ambac Assurance and the Rehabilitator of the Segregated Account, acting for and on behalf of the Segregated Account, to pay interest on outstanding surplus notes issued by Ambac and the Segregated Account on the annual scheduled interest payment date of June 7th. Neither Ambac Assurance nor the Rehabilitator of the Segregated Account, acting for and on behalf of the Segregated Account, have requested to pay interest on any junior surplus notes since their issuance. The interest of the outstanding surplus notes and junior surplus notes were accrued for and Ambac is accruing interest on the interest amounts following each scheduled interest payment date. In connection with the consummation of the Rehabilitation Exit Transactions, Ambac Assurance received the approval of the OCI to make a one-time current interest payment of $13.5 million on surplus notes outstanding after the Rehabilitation Exit Transactions (other than junior surplus notes) in 2018. Refer to Note 1. Background and Business Description to the Consolidated Financial Statements for information relating to the Rehabilitation Exit Transactions Total accrued and unpaid interest for surplus notes and junior surplus notes outstanding to third parties were $345.3 million and $99.5 million, respectively, at December 31, 2017. Principal and interest payments on junior surplus notes, which became obligations of AAC on February 12, 2018, cannot be made until all Ambac Assurance surplus notes (other than other junior surplus notes) are paid in full and after all future and existing senior | Ambac Financial Group, Inc. 55 2017 FORM 10-K | indebtedness of AAC, policy and other priority claims against AAC have been paid in full. Provision for Income Taxes. The provision for income taxes for the year ended December 31, 2017, 2016 and 2015 was $44.5 million, $30.7 million, and $17.4 million, respectively. The income tax for all periods include a provision (benefit) for federal AMT taxes. The income tax for the year ended December 31, 2017 reflects an estimated net discrete cost of $1.9 million resulting from the TCJA, further described in Note 14. Income Taxes. The income tax for the year ended December 31, 2017 and 2016, includes a current income tax provision for income tax due in respect of Ambac UK of $40.6 million, and $26.2 million, respectively. Ambac UK fully utilized operating losses brought forward from prior periods in the first quarter of 2016, resulting in income tax being payable. At December 31, 2017 the Company had $3.7 billion of U.S. Federal net ordinary operating loss carryforwards, including $1.4 billion at Ambac Financial Group and $2.3 billion at Ambac Assurance. LIQUIDITY AND CAPITAL RESOURCES Ambac Financial Group, Inc. Liquidity. Ambac’s liquidity is dependent on its cash and liquid investments of $96.3 million as of December 31, 2017 and expense sharing and other arrangements with Ambac Assurance. Ambac has an aggregated investment of $207.2 million in Ambac Assurance insured RMBS and surplus notes issued by Ambac Assurance and the Segregated Account. These securities issued or insured by Ambac Assurance and the Segregated Account are generally less liquid than investment grade and other traded investments. Ambac's investments also include $64.7 million of combined debt and equity interests in Corolla Trust (as defined in the Executive Summary section of this Management Discussion and Analysis). Pursuant to the amended and restated tax sharing agreement among Ambac, Ambac Assurance and certain affiliates (the “Amended required, under certain TSA"), Ambac Assurance is circumstances, to make payments ("tolling payments") to Ambac with respect to the utilization of net operating loss carry-forwards (“NOLs”). Ambac received $100.8 million of tolling payments based on NOLs used by Ambac Assurance through December 31, 2016, and Ambac has accrued an additional tolling payment of $30.5 million that is expected to be paid to Ambac no later than forty-five days after April 15, 2018. Additionally, under an inter- company cost allocation agreement, Ambac is reimbursed for certain operating costs and expenses. It is highly unlikely that Ambac Assurance will be able to make dividend payments to Ambac for the foreseeable future and therefore cash and investments, payments under the intercompany cost allocation agreement and future tolling payments, if any, will be Ambac’s principal source of liquidity in the near term. Refer to Part I, Item 1, “Insurance Regulatory Matters - Dividend Restrictions, Including Contractual Restrictions” and Note 8. Insurance Regulatory Restrictions to the Consolidated Financial Statements included in Part II, Item 8, in this Form 10-K for more information on dividend payment restrictions. The principal use of liquidity is the payment of operating expenses, including costs to explore opportunities to grow and diversify Ambac, and the making of investments including securities issued or insured by Ambac Assurance. Contingencies could cause material liquidity strains. The following table includes aggregated information about contractual obligations for Ambac and its subsidiaries, excluding variable interest entities consolidated as a result of Ambac Assurance’s financial guarantee contracts. These obligations include payments due under specified contractual obligations, aggregated by type of contractual obligation, including claim payments, principal and interest payments under Ambac Assurance’s surplus notes, and payments due under operating leases. The table and commentary below reflect scheduled payments and maturities based on the original payment terms specified in the underlying agreements and contracts, or expected required payment dates if earlier. ($ in millions) Surplus note obligations(1) Operating lease obligations(2) Purchase obligations(3) Postretirement benefits(4) Loss and loss expenses(5) Income taxes Total Payments Due by Period Total Less Than 1 Year 1 - 3 Years 3 - 5 Years More Than 5 Years $ 4,054.2 $ 368.9 $ 831.8 $ — $ 2,853.5 29.3 23.8 4.2 8,025.6 — 6.8 21.4 0.3 4,196.2 — 7.5 2.4 0.6 386.7 — 3.2 — 0.8 207.8 — $ 12,137.1 $ 4,593.6 $ 1,229.0 $ 211.8 $ 11.8 — 2.5 3,234.9 — 6,102.7 (1) Includes principal of and interest on surplus notes (excluding junior surplus notes) on their scheduled maturity date. Also includes all principal and interest on junior surplus notes on the date all future and existing senior indebtedness of Ambac Assurance, policy and other priority claims against Ambac Assurance have been paid in full (included in the more than 5 years column). All payments of principal and interest on surplus notes are subject to the prior approval of the OCI. If the OCI does not approve the payment of interest on the surplus notes, such interest will accrue and compound annually until paid. Annually from 2011 through 2017, OCI disapproved scheduled interest payments. Amounts in the table assume future approval by OCI for surplus notes (excluding junior surplus notes) for all principal and interest payments, including payment of previously deferred interest totaling $314.4 on the next scheduled payment date of June 7, 2018. (2) Amount represents future lease payments on lease agreements existing as of December 31, 2017. Ambac Assurance's lease with One State Street Plaza has a provision where Ambac Assurance can extend the lease of certain floors past the termination date of September 2019 to December 2029. The above table does not reflect payments on those certain floors after the related lease expiry date of September 2019. | Ambac Financial Group, Inc. 56 2017 FORM 10-K | (3) Purchase obligations represent future expenditures for contractually scheduled fixed terms and amounts due for various technology-related maintenance agreements and other outside services. Includes $18.3 million of success fees to various advisors in connection with the Rehabilitation Exit Transactions. (4) Amount represents future payments relating to Ambac Assurance's postretirement medical reimbursement benefits for current retirees over the next 10 years. (5) The timing of expected claim payments is based on deal specific cash flows, excluding expected recoveries. These deal specific cash flows are based on the expected cash flows of the underlying transactions (e.g. for RMBS credits we model estimated future claim payments). The timing of expected claim payments for credits with reserves that were established using our statistical loss reserve method is determined based on the weighted average expected life of the exposure. Refer to the Loss Reserves section in Note 2. Basis of Presentation and Significant Accounting Policies to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for further discussion of our statistical loss reserve method. The timing of these payments may vary significantly from the amounts shown above, especially for credits that are based on our statistical loss reserve method. Included in as an obligation due in less than 1 year, are obligations related to the Segregated Account's unpaid claims of $3,027.0 and interest accrued on Deferred Amounts of $839.7 as of December 31, 2017. These obligations of the Segregated Account were subject to the Rehabilitation Exit Transactions, which were executed on February 12, 2018. Refer to the Rehabilitation Exit Transactions section in Note 1. Background and Business Description to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for further discussion. Ambac Assurance Liquidity. Ambac Assurance’s liquidity is dependent on the balance of liquid investments and, over time, the net impact of sources and uses of funds. The principal sources of Ambac Assurance’s liquidity are gross installment premiums on insurance and credit default swap contracts, principal and interest payments from investments, sales of investments, proceeds from repayment of affiliate loans, recoveries on claim payments and reinsurance recoveries. Termination of installment premium policies on an accelerated basis may adversely impact Ambac Assurance’s liquidity. The principal uses of Ambac Assurance’s liquidity are the payment of operating expenses, claim, commutation and related expenses payments on both insurance and credit derivative contracts, ceded reinsurance premiums, surplus note principal and interest payments, if approved by OCI, additional loans to affiliates and tax payments to Ambac, including tolling payments due under the Amended TSA. Interest and principal payments on surplus notes are subject to the approval of OCI, which has full discretion over payments regardless of the liquidity position of Ambac Assurance. Ambac Assurance manages its liquidity risk by maintaining comprehensive analyses of projected cash flows and maintaining specified levels of cash and short-term investments at all times. Pursuant to the injunctions issued by the Rehabilitation Court, claims on policies allocated to the Segregated Account were not permitted to be paid during the Segregated Account Rehabilitation Proceedings until approved by the Rehabilitator. The Segregated Account was obliged to make Interim Payments of 45% of each permitted policy claim to be paid on or after July 21, 2014 in accordance with the Segregated Account Rehabilitation Plan and associated rules and guidelines. In addition, the Rehabilitator sought and received approval from the Rehabilitation Court to make Supplemental Payments (i.e., cash payments in excess of 45% of the permitted policy claim amount with respect to certain policies so that cash flow in the related securitization trusts that would have been available to reimburse Ambac Assurance had it paid claims in full under such policies is not diverted to uninsured holders who would not have received such cash flow if claims had been paid in full) and Special Policy Payments (i.e., claims payments in excess of the then applicable claims cash payment percentage, and/or payments of all or portions of unpaid permitted policy claims with settlement proceeds from RMBS remediation claims) with respect to certain insured securities. During the years ended December 31, 2017 and 2016, the Segregated Account made, in aggregate, Supplemental Payments and Special Policy Payments in respect of permitted policy claims of $47.6 million and $84.3 million, respectively. from On February 12, 2018, Ambac and Ambac Assurance consummated the Rehabilitation Exit Transactions. The cash the Rehabilitation Exit Transactions was outflow approximately $1.4 billion. See Note 1. Background and Business Description to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for details regarding the Rehabilitation Exit Transactions. Ambac Assurance is limited in its ability to pay dividends to Ambac pursuant to the terms of the Settlement Agreement, the Stipulation and Order and its Auction Market Preferred Shares (“AMPS”). • Pursuant to the Settlement Agreement, Ambac Assurance may not make any “Restricted Payment” (which includes dividends from Ambac Assurance to Ambac) in excess of $5 million in the aggregate per annum, other than Restricted Payments from Ambac Assurance to Ambac in an amount up to $7.5 million per annum solely to pay operating expenses of Ambac. Concurrent with making any such Restricted Payment, a pro rata amount of surplus notes (other than junior surplus notes) would also need to be redeemed at par. • The Stipulation and Order requires OCI approval for the payment of any dividend or distribution on the common stock of Ambac Assurance. The terms of the AMPS state that dividends may not be paid on the common stock of Ambac Assurance unless all accrued and unpaid dividends on the AMPS for the then current dividend period have been paid, provided that dividends on the common stock may be made at all times for the purpose of, and only in such amounts as are necessary for enabling Ambac (i) to service its indebtedness for borrowed money as such payments become due or (ii) to pay its operating expenses. If dividends are paid on the common stock for such purposes, dividends on the AMPS become cumulative until the date that all accumulated and unpaid dividends have been paid on the AMPS. Ambac Assurance has not paid dividends on the AMPS since 2010. Refer to Part I, Item 1, “Insurance Regulatory Matters - Dividend Restrictions, Including Contractual Restrictions” and Note 8. Insurance Regulatory Restrictions to the Consolidated Financial Statements included in Part II, Item 8 in this10-K for more information on dividend payment restrictions. | Ambac Financial Group, Inc. 57 2017 FORM 10-K | During the year ended December 31, 2017 and 2016, Ambac Assurance received total subrogation of $244.0 million and $1,355.4 million, respectively, net of reinsurance, primarily related to RMBS. • The year ended December 31, 2017 includes $49.7 million ($49.8 million gross of reinsurance) of subrogation recoveries related to a reimbursement of claims due to a mortgage insurance settlement. Cash Flow Statement Discussion. summarizes the net cash flows for the periods presented. The following table ($ in million) Year Ended December 31, Cash provided by (used in): 2017 2016 2015 Operating activities Investing activities Financing activities $ (212.8) $ 843.5 $ 91.8 928.8 (182.1) (714.6) (69.7) (175.7) 46.9 • The year ended December 31, 2016 the representation and warranty receipt from JP Morgan of $992.8 million ($995.0 million gross of reinsurance) and $99.1 million ($100.3 million gross of reinsurance) of subrogation recoveries related to the Countrywide Investor Settlement. includes Our ability to realize representation and warranty subrogation recoveries is subject to significant uncertainty, including risks inherent in litigation, collectability of such amounts from counterparties (and/or their respective parents and affiliates), timing of receipt of any such recoveries, intervention by the OCI which could impede our ability to take actions required to realize such recoveries and uncertainty inherent in the assumptions used in estimating such recoveries. The amount of these subrogation recoveries is significant and if we are unable to recover any amounts, our future available liquidity to pay claims would be reduced materially. Ambac Financial Services ("AFS") Liquidity. AFS provided interest rate swaps to states, municipalities and their authorities, asset-backed issuers and other entities in connection with their financings. Additionally, AFS uses interest rate derivatives as an economic hedge against the effects of rising interest rates elsewhere in the Company, including on the financial guarantee and investment portfolios. The principal uses of liquidity by AFS are payments on intercompany loans, payments under derivative contracts (primarily interest rate swaps and US Treasury futures), collateral posting and operating expenses. Liquidity risk exists in the derivative portfolios due to contract provisions which may require collateral posting, daily settlements or early termination of contracts. AFS borrows cash and securities from Ambac Assurance to meet liquidity needs when such borrowing is determined to be most economically beneficial to Ambac Assurance. Intercompany loans are made under established lending agreements with defined borrowing limits that have received non-disapproval from OCI. In June 2017, AFS received a $94.4 million capital contribution from Ambac Assurance that was used to commute the majority of its remaining interest rate swaps with financial guarantee customer counterparties effective June 27, 2017. This swap commutation reduced, but does not eliminate, AFS's liquidity risk from potential early terminations of uncollateralized derivatives. Management believes that AFS’ short and long-term liquidity needs can be funded from intercompany loans from Ambac Assurance and receipts from derivative contracts. Effect of foreign exchange on cash and cash equivalents Net cash flow Operating activities $ $ (1.2) $ (3.9) $ (1.1) 532.7 $ 55.3 $ (38.2) The following represents the significant cash activities during the years ended December 31, 2017, 2016 and 2015 : • During the year ended December 31, 2017, Ambac made payments of $94.4 million to commute interest rate swaps with a special purpose entity, Augusta Funding Limited IV; • During the year ended December 31, 2017, Ambac made payments of $104.7 million to extinguish (on a consolidated basis) principal and interest of surplus notes of Ambac Assurance and the Segregated Account of Ambac Assurance and settled certain residual obligations related to previously called surplus notes ($69.5 million principal and $35.2 million interest). The interest amount reduces operating cash flows and the principal reduced financing cash flows; and • During the years ended December 31, 2017, 2016 and 2015, Ambac had net loss and loss expenses paid (recovered) of $134.3 million, $(939.6) million and $1.1 million, respectively. Included in the recoveries for the year ended December 31, 2017 were the subrogation recoveries related to a mortgage insurance settlement of $49.7 million ($49.8 million gross of reinsurance). Included in the recoveries for the year ended December 31, 2016 were the representation and warranty receipt from JP Morgan of $992.8 million and $99.1 million of subrogation recoveries related to the Countrywide Investor Settlement. Excluding subrogation receipts, loss and loss expenses paid, including commutation payments, were $378.3 million, $415.8 million, and $398.3 million for the years ended December 31, 2017, 2016 and 2015, respectively. Losses paid on Puerto Rico polices were $142.5 million, $63.3 million and $0.0 million for the years ended December 31, 2017, 2016 and 2015, respectively. • During the year ended December 31, 2017 and 2016 tax payments amounted to $40.3 million and $21 million, respectively. Future operating cash flows will primarily be impacted by the level of premium collections, investment coupon receipts and claim or commutation payments. | Ambac Financial Group, Inc. 58 2017 FORM 10-K | Financing Activities Financing activities for the year ended December 31, 2017 included paydowns on a secured borrowing of $29.0 million, payments for investment agreements of $82.4 million, payments for extinguishment of surplus notes of $69.5 million; compared to repayments of secured borrowing of $29.5 million, payment for investment agreements of $18.0 million, payments for the extinguishment of surplus notes of $19.6 million and the acquisition of Ambac warrants of $2.7 million for the year ended December 31, 2016. Financing activities for the year ended December 31, 2015 included proceeds of $129.9 million (net of repayments during the year ended December 31, 2015) received from a secured borrowing, partially offset by payments for investment agreements of $63.9 million, payments for extinguishment of surplus notes of $13.8 million and the acquisition of Ambac warrants of $5.0 million. Principal and interest due on the debt issued in connection with the Rehabilitation Exit Transactions as well as future payments on the remaining surplus notes will impact Ambac's future cash flows. Collateral AFS provides interest rate swaps for states, municipalities, asset- backed issuers and other entities in connection with their financings. AFS hedges interest rate risk of these instruments, as well as a portion of the interest rate risk in the financial guarantee portfolio, with standardized derivative contracts, including financial futures contracts, which contain collateral or margin requirements. Under these hedge agreements, AFS is required to post collateral or margin to its counterparties and futures commission merchants to cover unrealized losses. In addition, AFS is required to post collateral or margin in excess of the amounts needed to cover unrealized losses. All AFS derivative contracts containing ratings-based downgrade triggers that could result in collateral or margin posting or a termination have been triggered. If terminations were to occur, AFS would be required to make termination payments but would also receive a return of collateral or margin in the form of cash, U.S. Treasury or U.S. government agency obligations with market values equal to or in excess of market values of the swaps and futures contracts. In most cases, AFS will look to re-establish hedge positions that are terminated early. This may result in additional collateral or margin obligations. The amount of additional collateral or margin posted on derivatives contracts will depend on several variables including the degree to which counterparties exercise their termination rights (or agreements terminate automatically) and the terms on which hedges can be replaced. All collateral and margin obligations are currently met. Collateral and margin posted by AFS totaled a net amount of $120.6 million (cash and securities collateral of $20.9 million and $99.7 million, respectively), including independent amounts, under these contracts at December 31, 2017. Ambac Credit Products (“ACP”) is not required to post collateral under any of its outstanding derivative contracts. BALANCE SHEET Total assets increased by approximately $557 million from December 31, 2016 to $23.2 billion at December 31, 2017, primarily due to higher variable interest entity assets as a result of lower credit spreads and strengthening of the British Pound Sterling receivable for securities, partially offset by (i) consideration paid for Ambac's extinguishment of all Segregated Account surplus notes and a portion of Ambac Assurance surplus notes (cash and investments); (ii) amortization of the insurance intangible asset during the period, (iii) payment of $94 million in connection with interest rate swap commutations, (iv) lower premium receivables, and (v) application of $71 million of collateral receivable included in other assets as of December 31, 2016 as a reduction to derivative liabilities under new rules by our central clearing party effective January 3, 2017 governing the character of variation margin. Under the new rules, variation margin payments are considered settlements of the associated derivative balance and accordingly were removed from other assets and recoded as a reduction to derivative liabilities. Refer to Note 11. Derivative Instruments in this Form 10-K located in Part II. Item 8 for further information on the rule change. Total liabilities increased by approximately $889 million from December 31, 2016 to $21.5 billion as of December 31, 2017, primarily as a result of (i) higher variable interest entity liabilities as a result of lower credit spreads and strengthening of the British Pound Sterling, (ii) higher loss and loss expense reserves and (iii) higher deferred tax liabilities relating to Ambac's foreign subsidiaries as a result of the Tax Cuts and Jobs Act enacted in December 2017, partially offset by (i) the maturity of the last remaining investment agreement, (ii) reductions to derivative liabilities of $145 million related to terminated interest rate swaps and $71 million associated with the characterization of variation margin as noted above, (iv) reductions to long-term debt as a result of the extinguishment of surplus notes and (v) lower unearned premium revenue. As of December 31, 2017 total stockholders’ equity was $1,645 million, compared with total stockholders’ equity of $1,978 million at December 31, 2016. This decrease was primarily driven by Total Comprehensive Loss during the period. Total Comprehensive Loss during 2017 was driven by a net loss during the period and unrealized losses on investment securities, partially offset by translation gains related to Ambac's foreign subsidiaries. As further discussed in Note 1. Background and Business Description and Note 17. Subsequent Events of the Consolidated Financial Statements in Part II, Item 8 of this Form 10-K, on February 12, 2018, the Second Amended Plan of Rehabilitation became effective and the Rehabilitation Exit Transactions were consummated. The Rehabilitation Exit Transactions involved a series of transactions which provided holders of beneficial interests in Deferred Amounts (other than Ambac, but including Ambac Assurance) a total effective consideration package, in full satisfaction and discharge of each $1.00 of Deferred Amounts (including accretion), of (i) $0.40 in cash, (ii) $0.41 in principal amount of new Secured Notes and (iii) from certain holders of surplus notes, $0.125 currently outstanding surplus notes. Such consideration package thereby provided a discount of $0.065 (set first against accretion of Deferred Amounts). Ambac received $0.91 in principal amount of Secured Notes for each $1.00 of Deferred Amounts (including accretion) that it held, and provided a $0.09 discount in full satisfaction and discharge of its Deferred Amount claims. Additionally, the Rehabilitation Exit Transactions also involved a series of interrelated transactions involving the exchange of certain surplus notes (collectively, the “Exchange | Ambac Financial Group, Inc. 59 2017 FORM 10-K | Offers”), pursuant to which, for each $1.00 of principal amount outstanding and accrued and unpaid interest thereon, holders effectively (i) received $0.40 in cash, (ii) received $0.41 in principal amount of Secured Notes, (iii) retained $0.125 in principal amount and accrued and unpaid interest thereon of surplus notes and (iv) provided a discount of $0.065 in principal amount and accrued and unpaid interest thereon. Ambac did not participate in the Exchange Offers. See below "Pro Forma Balance Sheet and Pro Forma Adjusted Book Value" in this Management Discussion and Analysis for a depiction of the transactions on the Consolidated Balance Sheet as if the Rehabilitation Exit Transactions were consummated on December 31, 2017. This transaction will have a significant impact on the comparability of Ambac's financial results between 2018 and prior years. Investment Portfolio. Ambac Assurance’s and Everspan's non- VIE investment objective is to achieve the highest risk-adjusted after-tax return on a diversified portfolio of primarily fixed income investments while employing asset/liability management practices to satisfy operating and strategic liquidity needs. Ambac Assurance’s investment portfolio is subject to internal investment guidelines and is subject to limits on types and quality of investments imposed by the insurance laws and regulations of the jurisdictions in which it is licensed, primarily the States of Wisconsin and New York. Such guidelines set forth minimum credit rating requirements and credit risk concentration limits. Within these guidelines, which in certain instances may be exceeded with the approval of the applicable regulatory authority, Ambac Assurance opportunistically purchases Ambac Assurance insured securities given their relative risk/reward characteristics. Ambac Assurance’s investment policies are subject to oversight by OCI pursuant to the Settlement Agreement and the Stipulation and Order. The Board of Directors of Ambac Assurance approves any changes to Ambac Assurance's investment policy. Ambac UK’s non-VIE investment policy is designed with the primary objective of ensuring that Ambac UK is able to meet its financial obligations as they fall due, in particular with respect to policyholder claims. Ambac UK’s investment portfolio is primarily fixed income investments and diversified holdings of pooled investment funds. The portfolio is subject to internal investment guidelines and may be subject to limits on types and quality of investments imposed by the PRA as regulator of Ambac UK. Ambac UK’s investment policy sets forth minimum credit rating requirements and concentration limits, among other restrictions. The Board of Directors of Ambac UK approves any changes or exceptions to Ambac UK’s investment policy. Ambac Financial Group, Inc.'s non-VIE investment portfolio's primary objective is to preserve capital for strategic uses while maximizing income, including investments in securities issued by or guaranteed by Ambac Assurance. Refer to Note 10. Investments in this Form 10-K in this Form 10- K located in Part II. Item 8 for information about Ambac's consolidated non-VIE investment portfolio. The following table summarizes the composition of Ambac’s investment portfolio, excluding VIE investments, at carrying value at December 31, 2017 and 2016: ($ in millions) December 31, Fixed income securities Short-term Other investments Fixed income securities pledged as collateral Total investments (1) 2017 2016 4,652.2 $ 5,554.2 557.3 431.6 99.7 5,740.8 $ $ 430.8 450.3 64.9 6,500.2 $ $ $ (1) Includes investments denominated in non-US dollar currencies with a fair value of £209.8 ($283.6) and €40.9 ($49.1) as of December 31, 2017 and £167.8 ($206.7) and €23.5 ($24.7) as of December 31, 2016. Ambac invests in various asset classes in its fixed income securities portfolio, including securities covered by guarantees issued by Ambac Assurance and other financial guarantors ("insured securities"). Refer to Note 10. Investments in this 10-K located in Part II. Item 8 for information about insured securities by guarantor and asset class. The following table represents the fair value of mortgage and asset-backed securities at December 31, 2017 and 2016 by classification: ($ in millions) December 31, Residential mortgage-backed securities: 2017 2016 RMBS—First-lien—Alt-A $ 1,029.4 $ 1,044.3 RMBS—Second Lien RMBS—First Lien—Sub Prime Total residential mortgage-backed securities Other asset-backed securities 839.9 382.0 910.4 396.9 2,251.3 2,351.6 Military Housing Student Loans Structured Insurance Credit Cards Auto Other Total other asset-backed securities 243.4 152.1 137.6 33.0 31.6 0.2 597.9 236.6 151.4 118.8 164.1 137.8 20.1 828.8 Total (1) $ 2,849.2 $ 3,180.4 (1) Includes investments guaranteed by Ambac Assurance and Ambac UK for both years presented. Refer to Note 10. Investments in this 10-K located in Part II. Item 8 for further details of Ambac-insured securities held in the investment portfolio. The weighted average rating, which is based on the lower of Standard & Poor’s or Moody’s ratings, of the mortgage and asset- backed securities is C and CCC as of December 31, 2017, and CC and BB- as of December 31, 2016, respectively. The following tables provide the ratings(1) distribution of the fixed income investment portfolio based on fair value at December 31, 2017 and 2016. | Ambac Financial Group, Inc. 60 2017 FORM 10-K | _______________________________________ (1) Ratings are based on the lower of Moody’s or S&P ratings. If ratings are unavailable from Moody's or S&P, Fitch ratings are used. If guaranteed, rating represents the higher of the underlying or guarantor’s financial strength rating. (2) Below investment grade and not rated bonds insured by Ambac represent 64% and 45% of the 2017 and 2016 combined portfolio, respectively. The increase in the percentage of not rated and below investment grade holdings since December 31, 2016 is driven by additional purchases of Ambac insured bonds. Premium Receivables. Ambac either received premium upfront at time of issuance of the insurance policy or in installments over the policy term. For installment premium transactions, a premium receivable asset is established equal to the (i) present value of future contractual premiums due or (ii) if the underlying insured obligation is a homogenous pool of assets which are contractually prepayable, the present value of premiums to be collected over the expected life of the transaction. Ambac's premium receivables decreased to $586 million at December 31, 2017 from $661 million at December 31, 2016. As further discussed in Note 7. Financial Guarantee Insurance Contracts, the decrease is due to premium receipts, including the termination premium of £12.6 million received in 2017, and adjustments for changes in expected and contractual cash flows, partially offset by the impact of currency exchange rates on non-US denominated future premiums and accretion of premium receivable discount. Premium receivables by payment currency were as follows: Currency (Amounts in millions) U.S. Dollars British Pounds Euros Australian Dollars Total Premium Receivable in Payment Currency Premium Receivable in U.S. dollars $ £ € A$ 397.6 $ 112.3 30.0 1.0 $ 397.6 151.9 36.0 0.8 586.3 Insurance Intangible Asset. At the Fresh Start Reporting Date, an insurance intangible asset was recorded which represented the difference between the fair value and aggregate carrying value of the financial guarantee insurance and reinsurance assets and liabilities. For the year ended December 31, 2017 and 2016, the insurance intangible amortization expense was $151 million and $175 million, respectively. As of December 31, 2017 and 2016, the gross carrying value of the insurance intangible asset was $1,581 million and $1,534 million, respectively. The increase in gross carrying value at December 31, 2017 from December 31, 2016 is solely impacted by translation gains (losses) from the consolidation of Ambac's foreign subsidiary (Ambac UK). Accumulated amortization of the insurance intangible asset was $734 million and $572 million, as of December 31, 2017 and 2016, respectively, resulting in a net insurance intangible asset of $847 million and $962 million, respectively. Derivative Liabilities. The interest rate derivative portfolio is positioned to benefit from rising rates as an economic hedge against interest rate exposure in the financial guarantee and investment portfolio. Derivative liabilities decreased from $319 million at December 31, 2016 to $83 million as of December 31, 2017. The decrease results primarily from the commutation of certain interest rate swaps with a liability fair value of $145 million at December 31, 2016, continued runoff of the credit derivative portfolio and the characterization of variation payments on centrally cleared derivatives as settlements of the associated derivative balances resulting from central clearing party rule changes that were effective January 3, 2017. The amount of variation margin included within "Other assets" on the Consolidated Balance Sheet as of December 31, 2016 that was reclassified as a reduction to derivative liabilities under the new CCP rules effective January 3, 2017 was $71 million. The valuation of derivative liabilities (credit derivatives and interest rate swaps) is impacted by the market’s view of Ambac Assurance’s credit quality. We reflect Ambac’s credit quality in the fair value of such liabilities by including a CVA in the determination of fair value, whereas a lower (higher) CVA, in isolation, would result in an increase (decrease) in the liability. Ambac reduced its derivative liabilities by $0.1 million | Ambac Financial Group, Inc. 61 2017 FORM 10-K | at December 31, 2017 and $46.9 million at December 31, 2016 to incorporate the market’s view of Ambac’s credit quality. The lower CVA as of December 31, 2017 is a function of the lower gross value of the associated derivative liabilities relative to December 31, 2016, primarily driven by the above referenced interest rate swaps commutation. Loss and Loss Expense Reserves and Subrogation Recoverable. Loss and loss expense reserves are based upon estimates of the ultimate aggregate losses inherent in the non-derivative portfolio issued to beneficiaries, insurance policies for including unconsolidated VIEs. Loss and loss expense reserves include the unpaid portion of interest accrued on Deferred Amounts established pursuant to the Segregated Account Rehabilitation Plan, which were discharged on February 12, 2018. The loss and loss expense reserves net of subrogation recoverables and before reinsurance as of December 31, 2017 and 2016 were $4,114 million and $3,696 million, respectively. Loss and loss expense reserves are included in the Consolidated Balance Sheets as follows: ($ in millions) Balance Sheet Line Item December 31, 2017: Loss and loss expense reserves Subrogation recoverable Totals December 31, 2016: Loss and loss expense reserves Subrogation recoverable Totals Unpaid Claims Claims Accrued Interest Present Value of Expected Net Cash Flows Claims and Loss Expenses Recoveries (1) Unearned Premium Revenue Gross Loss and Loss Expense Reserves (2) $ $ $ $ 2,412 615 3,027 2,411 583 2,994 $ $ $ $ 668 172 840 530 132 662 $ $ $ $ 2,855 102 2,957 2,681 68 2,749 $ $ $ $ (1,054) $ (136) $ (1,520) — (2,574) $ (136) $ (1,098) $ (143) $ (1,468) — (2,566) $ (143) $ 4,745 (631) 4,114 4,381 (685) 3,696 (1) (2) Includes the present value of future recoveries include R&W subrogation recoveries of $1,834 and $1,907 at December 31, 2017 and 2016, respectively. Includes Euro denominated gross loss and loss expense reserves. US dollar equivalents of such reserves were $21 (€18) and $21 (€20) at December 31, 2017 and 2016, respectively. The evaluation process for determining the level of reserves is subject to certain estimates and judgments. Please refer to the "Critical Accounting Policies and Estimates" and “Results of Operations” sections of this Management’s Discussion and Analysis of Financial Condition and Results of Operations in addition to Basis of Presentation and Significant Accounting Policies and Loss Reserves sections included in Note 2. Basis of Presentation and Significant Accounting Policies and Note 7. Financial Guarantee Insurance Contracts, respectively of the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for further information on loss and loss expenses. Ambac has exposure to various bond types issued in the debt capital markets. Our experience has shown that, for the majority of bond types, we have not experienced significant claims. The bond types that have experienced significant claims, including through commutations, are residential mortgage-backed securities (“RMBS”) and student loan securities. These two bond types represent 87% of our ever-to-date insurance claims recorded with RMBS comprising 82%. Although historically RMBS and student loan securities have been the largest source of claim activity there are reserves on Public Finance and Ambac UK credits that may result in significant claim payments in the future. The table below indicates gross par outstanding and the components of gross loss and loss expense reserves related to policies in Ambac’s gross loss and loss expense reserves at December 31, 2017 and 2016: | Ambac Financial Group, Inc. 62 2017 FORM 10-K | Unpaid Claims Gross Par Outstanding (1)(2) Claims Accrued Interest Present Value of Expected Net Cash Flows Claims and Loss Expenses Recoveries Unearned Premium Revenue Gross Loss and Loss Expense Reserves (1)(3) $ $ $ 5,243 $ 3,014 $ 837 $ 888 $ (2,120) $ (21) $ 2,598 4,265 701 941 537 — 13 — — — — 3 — — — — 1,278 361 315 26 89 (403) (40) (11) — — (75) (13) (18) (9) — 816 308 286 17 89 11,687 $ 3,027 $ 840 $ 2,957 $ (2,574) $ (136) $ 4,114 6,756 $ 2,982 $ 660 $ 1,073 $ (2,295) $ (26) $ 2,394 4,410 728 939 567 — 12 — — — — 2 — — — — 822 337 416 26 75 (216) (45) (10) — — (73) (13) (18) (13) — 547 279 388 13 75 $ 13,400 $ 2,994 $ 662 $ 2,749 $ (2,566) $ (143) $ 3,696 ($ in millions) December 31, 2017: RMBS Domestic Public Finance Student Loans Ambac UK All other credits Loss expenses Totals December 31, 2016: RMBS Domestic Public Finance Student Loans Ambac UK (4) All other credits Loss expenses Totals (1) Ceded par outstanding on policies with loss reserves and ceded loss and loss expense reserves are $590 and $41, respectively, at December 31, 2017 and $607 and $31, respectively at December 31, 2016. Ceded loss and loss expense reserves are included in Reinsurance recoverable on paid and unpaid losses. (2) Gross Par Outstanding includes capital appreciation bonds, which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bond. (3) Loss reserves are included in the balance sheet as Loss and loss expense reserves or Subrogation recoverable dependent on if a policy is in a net liability or net recoverable position. (4) Present value of Expected Net Cash Flows is reduced by estimated recoveries from the Ambac UK v. J.P. Morgan Investment Management litigation, which was settled in 2017. Please refer to Note 7. Financial Guarantee Insurance Contracts of the Consolidated Financial Statements in Part II, Item 8 of this Form 10-K for additional information relating to this settlement. RMBS Ambac has exposure to the U.S. mortgage market primarily including through direct financial guarantees of RMBS, transactions collateralized by first and second liens. We established a representation and warranty subrogation recovery as further discussed in "Critical Accounting Policies and Estimates" section of this Management’s Discussion and Analysis of Financial Condition and Results of Operations in addition to the Basis of Presentation and Significant Accounting Policies and Loss Reserves sections included in Note 2. Basis of Presentation and Significant Accounting Policies and Note 7. Financial Guarantee Insurance Contracts, respectively, of the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K. Our ability to realize RMBS representation and warranty recoveries is subject to significant uncertainty, including risks inherent in litigation, collectability of such amounts from counterparties (and/ or their respective parents and affiliates), timing of receipt of any such recoveries, intervention by the OCI which could impede our ability to take actions required to realize such recoveries, and uncertainty inherent in the assumptions used in estimating such recoveries. The table below distinguishes between RMBS credits for which we have not established a representation and warranty subrogation recovery and those for which we have, providing in both cases the gross par outstanding, gross loss reserves before representation and warranty subrogation recoveries, and gross loss reserves net of representation and warranty subrogation recoveries for all RMBS exposures for which Ambac established reserves at December 31, 2017 and 2016: | Ambac Financial Group, Inc. 63 2017 FORM 10-K | ($ in millions) December 31, 2017: Second-lien First-lien Mid-prime First-lien Sub-prime Other Total Credits Without Subrogation Second-lien First-lien Mid-prime First-lien Sub-prime Total Credits With Subrogation Total December 31, 2016: Second-lien First-lien-Mid-prime First-lien-Sub-prime Other Total Credits Without Subrogation Second-lien First-lien Mid-prime First-lien Sub-prime Total Credits With Subrogation Total Public Finance Gross Loss Reserves Before Representation and Warranty Subrogation Recoveries Representation and Warranty Subrogation Recoveries Gross Loss Reserves Net of Representation and Warranty Subrogation Recoveries Gross Par Outstanding $ 1,065 $ 735 $ — $ 1,849 667 137 3,718 735 59 731 1,997 190 144 3,066 719 104 543 1,525 5,243 $ 1,366 4,432 $ — — — — (1,272) (79) (483) (1,834) (1,834) $ 1,169 $ 679 $ — $ $ $ 2,226 1,194 201 4,790 1,045 72 849 1,966 $ 6,756 $ 1,901 231 138 2,949 705 97 550 1,352 4,301 $ — — — — (1,333) (79) (495) (1,907) (1,907) $ 735 1,997 190 144 3,066 (553) 25 60 (468) 2,598 679 1,901 231 138 2,949 (628) 18 55 (555) 2,394 Ambac’s U.S. public finance portfolio consists predominantly of municipal bonds such as general and revenue obligations and lease and tax-backed obligations of state and local government entities; however, the portfolio also comprises a wide array of non- municipal types of bonds, including financings for not-for-profit entities and transactions with public and private elements, which generally finance infrastructure, housing and other public purpose facilities and interests. The increase in public finance gross loss reserves at December 31, 2017 as compared to December 31, 2016 was primarily related to adverse developments in Puerto Rico and military housing. Total public finance gross loss reserves and related gross par outstanding on Ambac insured obligations by bond type were as follows: ($ in millions) Issuer Type December 31, Lease and tax-backed General obligation Transportation revenue Housing Other Total 2017 2016 Gross Par Outstanding (1) Gross Loss Reserves Gross Par Outstanding (1) Gross Loss Reserves $ $ 2,201 $ 1,053 495 449 67 650 $ 60 64 31 11 2,114 $ 1,422 516 179 179 4,265 $ 816 $ 4,410 $ 395 78 62 9 3 547 (1) Gross Par Outstanding includes capital appreciation bonds, which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bond. SPECIAL PURPOSE AND VARIABLE INTEREST ENTITIES information regarding special purpose and variable interest entities. Please refer to Note 2. Basis of Presentation and Significant Accounting Policies and Note 3. Special Purpose Entities, Including Variable Interest Entities to the Consolidated Financial Statements, included in Part II, Item 8 in this Form 10-K, for ACCOUNTING STANDARDS Please refer to Note 2. Basis of Presentation and Significant Accounting Policies to the Consolidated Financial Statements, | Ambac Financial Group, Inc. 64 2017 FORM 10-K | included in Part II, Item 8 in this Form 10-K, for a discussion of the impact of recent accounting pronouncements on Ambac’s financial condition and results of operations. AMBAC ASSURANCE STATUTORY BASIS FINANCIAL RESULTS Ambac Assurance, Everspan and the Segregated Account’s statutory financial statements are prepared on the basis of accounting practices prescribed or permitted by the OCI. OCI recognizes only statutory accounting practices prescribed or permitted by the State of Wisconsin (“SAP”) for determining and reporting the financial condition and results of operations of an insurance company for determining its solvency under Wisconsin Insurance Law. The National Association of Insurance Commissioners (“NAIC”) Accounting Practices and Procedures manual (“NAIC SAP”) has been adopted as a component of prescribed practices by the State of Wisconsin. OCI has prescribed or permitted additional accounting practices for Ambac Assurance, Everspan and the Segregated Account which are described in Note 8. Insurance Regulatory Restrictions to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K. As a result of these prescribed and permitted practices, Ambac Assurance’s policyholder surplus at December 31, 2017 and 2016 was less than $104.1 million and higher by $17.3 million, respectively, than if Ambac Assurance and the Segregated Account had reported such amounts in accordance with NAIC SAP. Under Wisconsin insurance law, the Segregated Account was a separate insurer from Ambac Assurance and accordingly was subject to all of the filing and statutory reporting requirements of Wisconsin domiciled insurers. The total assets, total liabilities, and total surplus of the Segregated Account are reported as discrete components of Ambac Assurance’s assets, liabilities, and surplus in Ambac Assurance’s statutory basis financial statements. Accordingly, Ambac Assurance’s statutory financial statements include the results of Ambac Assurance’s general account and, to the extent allowable under a prescribed accounting practice by OCI, the Segregated Account. Pursuant to this prescribed practice, the results of the Segregated Account are not fully included in Ambac Assurance’s statutory financial statements if Ambac Assurance’s surplus is (or would be) less than $100.0 million (“Minimum Surplus Amount”). Ambac Assurance’s surplus as regards to policyholders exceeded the Minimum Surplus Amount. Ambac Assurance’s statutory policyholder surplus and qualified statutory capital (defined as the sum of policyholders surplus and mandatory contingency reserves) were $699.6 million and $1,155.8 million at December 31, 2017, respectively, as compared to $976.5 million and $1,368.3 million at December 31, 2016, respectively. The Segregated Account’s statutory policyholder surplus amount was $376.2 million and $381.3 million as of December 31, 2017 and 2016, respectively. Following the effectiveness of the Second Amended Plan of Rehabilitation and in accordance with the Stipulation and Order, Ambac Assurance is exempt from all filing requirements of the OCI and National Association of Insurance Commissioners regarding the Segregated Account that become due in or after the calendar quarter immediately following the effective date of the Second Amended Plan of Rehabilitation (second quarter of 2018). Ambac Assurance’s decrease in policyholder surplus was primarily due to decline in fair value of below investment grade bond investments and contributions to contingency reserves, partially offset by statutory net income. Statutory net income was primarily due to premium earnings and investment income, partially offset by loss and loss expenses incurred on Puerto Rico insured exposures. The Segregated Account’s decrease in policyholder surplus was primarily due to a reduction in junior surplus notes as a result of rent payments made by Ambac Assurance during the year ended December 31, 2017. Ambac Assurance’s statutory policyholder surplus includes $370.2 million of junior surplus notes issued by the Segregated Account, including $350.0 million that Ambac deposited into a statutory trust (as further discussed within Liquidity and Capital Resources in this Management's Discussion and Analysis). These junior surplus notes, as well as preferred stock issued by Ambac Assurance with a liquidation preference of $660.3 million, are obligations that have claims on the resources of Ambac Assurance which impact Ambac's ability to realize residual value from its equity in Ambac Assurance. increase Ambac Assurance’s statutory surplus is sensitive to multiple factors, including: (i) loss reserve development, (ii) approval by OCI of interest payments on existing surplus notes, (iii) approval by OCI of principal or interest payments on existing junior surplus notes, (iv) deterioration in the financial position of Ambac Assurance subsidiaries that have their obligations guaranteed by Ambac Assurance, (v) first time payment defaults of insured obligations, which reserves, (vi) commutations of insurance policies or credit derivative contracts at amounts that differ from the amount of liabilities recorded, (vii) reinsurance contract terminations at amounts that differ from net assets recorded, (viii) changes to the fair value of investments carried at fair value, (ix) settlements or resolutions of representation and warranty breach claims at amounts that differ from amounts recorded, including failures to collect such amounts, (x) realized gains and losses, including losses arising from other than temporary impairments of investment securities, and (xi) future changes to prescribed SAP practices by the OCI. statutory loss As of December 31, 2017, total unpaid interest, which will require OCI approval for payment, for surplus notes outstanding to third parties and junior surplus notes was $314.4 million and $86.3 million, respectively at the scheduled interest payment date of June 7, 2017. Under SAP, these amounts will be recorded as a liability once approval for payment has been granted by OCI. The significant differences between GAAP and SAP are that under SAP: • Loss reserves are only established for losses on guaranteed obligations that have defaulted in an amount that is sufficient to cover the present value of the anticipated defaulted debt service payments over the expected period of default, less estimated recoveries under subrogation rights (5.1% as prescribed by OCI). Loss reserves are established for non- defaulted policies on the date when a binding commutation contract is signed by the counterparty. Under GAAP, in addition to the establishment of loss reserves for defaulted obligations, loss reserves are established (net of GAAP basis | Ambac Financial Group, Inc. 65 2017 FORM 10-K | unearned premium revenue) for obligations that have experienced credit deterioration, but have not yet defaulted using a weighted-average risk-free discount rate, currently at 2.5%. • Mandatory contingency reserves are required based upon the type of obligation insured, whereas GAAP does not require such a reserve. Releases of the contingency reserves are generally subject to a determination that the held reserves are deemed excessive. to OCI approval and relate • Investment grade fixed income investments are stated at amortized cost and certain below investment grade fixed income investments are reported at the lower of amortized cost or fair value. Under GAAP, all fixed income investments are reported at fair value. • Wholly owned subsidiaries are not consolidated; rather, the equity basis of accounting is utilized and the carrying values of these investments are subject to admissibility tests. When Ambac Assurance’s share of the subsidiaries’ losses exceeds the related carrying amounts of the wholly owned subsidiary, Ambac Assurance discontinues applying the equity method and the investment is reduced to zero. For those subsidiaries that have insufficient claims paying resources and whose obligations are guaranteed by Ambac Assurance, Ambac Assurance records an estimated impairment for probable losses which are in excess of the subsidiaries’ claims paying resources. • Variable interest entities are not required to be assessed for consolidation. Under GAAP, a reporting entity that has both the following characteristics is required to consolidate the VIE: a) the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance; and b) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. Ambac generally has the obligation to absorb losses of VIEs that could potentially be significant to the VIE as the result of its guarantee of insured obligations issued by VIEs. For certain VIEs Ambac Assurance has the power to direct the most significant activities of the VIE and accordingly consolidates the related VIEs under GAAP. • All payments of principal and interest on the surplus notes are subject to the approval of the OCI. Unpaid interest due on the surplus notes is expensed when the approval for payment of interest has been granted by the OCI. Under GAAP, interest on surplus notes is accrued regardless of OCI approval. • Upfront premiums written are earned on a basis proportionate to the remaining scheduled debt service to the original total principal and interest insured. Installment premiums are reflected in income pro-rata over the period covered by the premium payment. When an insurance policy has been legally defeased, the related portion of unearned premium revenue is accelerated and recognized as premiums earned. Under GAAP, premium revenues for both upfront and installment premiums are earned over the life of the financial guarantee contract in proportion to the insured principal amount outstanding at each reporting date. When an insured bond has been retired, any remaining UPR is recognized at that time to the extent the financial guarantee contract is legally extinguished, causing accelerated premium revenue. For installment premium paying transactions, we offset the recognition of any remaining UPR by the reduction of the related premium receivable to zero, which may cause negative accelerated premium revenue. For bonds that are legally defeased, generally through a refunding or a pre-refunding, the remaining unearned premium revenue is not accelerated but is recognized over the remaining life of the defeasance period. • Fresh start financial statement reporting is not a concept within SAP. Under GAAP, Ambac determined that fresh start financial statement reporting was to be applied upon our emergence from Chapter 11. Fresh start financial reporting required Ambac to adjust the historical carrying of its assets and liabilities to fair value, including an insurance intangible asset which represented the difference between the fair value and aggregate carrying value of the financial guarantee insurance and reinsurance assets and liabilities. This insurance intangible asset is amortized as an expense on a level yield basis over the life of the related insurance risks. AMBAC UK FINANCIAL RESULTS UNDER UK ACCOUNTING PRINCIPLES Ambac UK is required to prepare financial statements under FRS 102 "The Financial Reporting Standard applicable in the UK and Republic of Ireland." Ambac UK’s shareholder funds under UK GAAP were £266.3 million at December 31, 2017 as compared to £157.9 million at December 31, 2016. Ambac UK’s improvement in shareholders’ funds was primarily due to net income arising from the receipt of premiums, investment return in the period and reduction in loss provisions, including amounts associated with Ballantyne's litigation settlement in April 2017. At December 31, 2017, the carrying value of cash and investments was £459.8 million, a decrease from £460.4 million at December 31, 2016. The decrease in cash and investments is due to loss expenses, tax payments and unrealized foreign exchange losses on investments denominated in currencies other then Ambac UK's functional currency (British Pounds) in the period, partially offset by the continued receipt of premiums, investment coupons from Ambac UK's investment portfolio and increases in the value of investments in pooled funds. The significant differences between U.S. GAAP and UK GAAP are that under UK GAAP: • Loss reserves are only established for losses on guaranteed obligations when, in the judgment of management, a monetary default in the timely payment of debt service is likely to occur, which would result in Ambac UK incurring a loss. A loss provision is established in an amount that is sufficient to cover the present value (currently using a discount rate of 4.42%) of the anticipated defaulted debt service payments over the expected period of default, less estimated recoveries under subrogation rights. The discount rate is equal to the lower of the rate of return on invested assets for either the current year or the period covering the current year plus the four previous years. Under U.S. GAAP, loss reserves are established (net of U.S. GAAP basis unearned premium revenue) for obligations that have experienced credit deterioration, but have not yet defaulted using a | Ambac Financial Group, Inc. 66 2017 FORM 10-K | weighted-average risk-free discount rate, currently at 1.6% for Ambac UK related transactions. • Investments in fixed income securities are stated at amortized cost, subject impairment to an other-than-temporary evaluation. Under U.S. GAAP, all bonds are reported at fair value. • Purchases of Ambac UK insured securities are bifurcated into an intrinsic and an Ambac UK claim based value. The intrinsic value is recorded as an investment whereas the Ambac UK claim based value is recorded as a claim payment with an accompanying reduction in Ambac UK loss reserves. Under U.S. GAAP, purchases of Ambac UK insured securities are reported as investments and do not reduce loss reserves. • Variable interest entities (“VIE”) are not required to be assessed for consolidation. Under U.S. GAAP, a reporting entity that has both the following characteristics is required to consolidate the VIE: a) the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance; and b) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. Ambac generally has the obligation to absorb losses of VIEs that could potentially be significant to the VIE as the result of its guarantee of insured obligations issued by VIEs. For certain VIEs Ambac UK has the power to direct the most significant activities of the VIE and accordingly consolidates the related VIEs under U.S. GAAP. • Upfront premiums written are earned on a basis proportionate to the remaining scheduled debt service to the total principal and interest insured. Installment premiums are reflected in income pro-rata over the period covered by the premium payment. Under U.S. GAAP, premium revenues for both upfront and installment premiums are earned over the life of the financial guarantee contract in proportion to the insured principal amount outstanding at each reporting date. Ambac UK is also required to prepare financial information in accordance with the Solvency II Directive. The basis of preparation of this information is significantly different from both US GAAP and UK GAAP. The calculation of capital resources, regulatory capital requirements and regulatory capital deficits under Solvency II at December 31, 2017 will be be published on Ambac's website. Capital resources under Solvency II were a surplus of £55.1 million at December 31, 2017 an improvement from a deficit of £67.1 million at January 1, 2017. The capital resources at December 31, 2017 and January 1, 2017 are in comparison to regulatory capital requirements of £343.6 million and £334.9 million, respectively. Ambac UK is therefore deficient in terms of compliance with applicable regulatory capital requirements by £288.5 million and £402.0 million at December 31, 2017 and January 1, 2017, respectively. The regulators are aware of the deficiency in capital resources as compared to capital requirements and dialogue between Ambac UK management and its regulators remains ongoing with respect to options for addressing the shortcoming, although such options remain few. NON-GAAP FINANCIAL MEASURES In addition to reporting the Company’s quarterly financial results in accordance with GAAP, the Company reports two non-GAAP financial measures: Adjusted Earnings and Adjusted Book Value. The most directly comparable GAAP measures are net income attributable to common stockholders for Adjusted earnings and Total Ambac Financial Group, Inc. stockholders’ equity for Adjusted Book value. A non-GAAP financial measure is a numerical measure of financial performance or financial position that excludes (or includes) amounts that are included in (or excluded from) the most directly comparable measure calculated and presented in accordance with GAAP. We are presenting these non-GAAP financial measures because they provide greater transparency and enhanced visibility into the underlying drivers of our business. Adjusted Earnings and Adjusted Book Value are not substitutes for the Company’s GAAP reporting, should not be viewed in isolation and may differ from similar reporting provided by other companies, which may define non-GAAP measures differently. Ambac has a significant U.S. tax net operating loss (“NOL”) that is offset by a full valuation allowance in the GAAP consolidated financial statements. As a result of this and other considerations, we utilized a 0% effective tax rate for non-GAAP adjustments; which is subject to change. The following paragraphs define each non-GAAP financial measure and describe why it is useful. A reconciliation of the non- GAAP financial measure and the most directly comparable GAAP financial measure is also presented below. Adjusted Earnings (Loss). Adjusted Earnings (Loss) is defined as net income (loss) attributable to common stockholders, as reported under GAAP, adjusted on an after-tax basis for the following: • Non-credit impairment fair value (gain) loss on credit derivatives: Elimination of the non-credit impairment fair value gains (losses) on credit derivatives, which is the amount in excess of the present value of the expected estimated credit losses. Such fair value adjustments are affected by, and in part fluctuate with, changes in market factors such as interest rates and credit spreads, including the market’s perception of Ambac’s credit risk (“Ambac CVA”), and are not expected to result in an economic gain or loss. These adjustments allow for all financial guarantee contracts to be accounted for consistent with the Financial Services – Insurance Topic of ASC, whether or not they are subject to derivative accounting rules. • Insurance intangible amortization and impairment of goodwill: Elimination of the amortization of the financial guarantee insurance intangible asset and impairment of goodwill that arose as a result of the implementation of Fresh Start reporting. These adjustments ensure that all financial guarantee contracts are accounted for consistent with the provisions of the Financial Services – Insurance Topic of the ASC. • Foreign exchange (gains) losses: Elimination of the foreign exchange gains (losses) on the re-measurement of assets, liabilities and transactions in non-functional currencies. This adjustment eliminates the foreign exchange gains (losses) on | Ambac Financial Group, Inc. 67 2017 FORM 10-K | all assets, liabilities and transactions in non-functional currencies, which enables users of our financial statements to better view the business results without the impact of fluctuations in foreign currency exchange rates, particularly as assets held in non-functional currencies have grown, and facilitates period-to-period comparisons of Ambac's operating performance. • Fair value (gain) loss on interest rate derivative from Ambac CVA: Elimination of the gains (losses) relating to Ambac’s CVA on interest rate derivative contracts. Similar to credit derivatives, fair values include the market’s perception of Ambac’s credit risk and this adjustment only allows for such gain or loss when realized. The following table reconciles net income attributable to common stockholders to the non-GAAP measure, Adjusted Earnings on a total dollar amount and per diluted share basis, for all periods presented: ($ in millions, except per share data) Year Ended December 31, Net income (loss) attributable to common shareholders Adjustments: Non-credit impairment fair value (gain) loss on credit derivatives Insurance intangible amortization Impairment of goodwill Foreign exchange (gains) losses (1) Fair value (gain) loss on interest rate derivatives from Ambac CVA 2017 2016 2015 $ Amount Per Diluted Share $ Amount Per Diluted Share $ Amount Per Diluted Share $ (328.7) $ (7.25) $ 74.8 $ 1.64 $ 493.4 $ 10.72 (10.9) 150.9 — (21.3) 44.9 (0.24) 3.33 — (0.47) 0.99 (7.5) 174.6 — 39.1 33.8 (0.16) 3.82 — 0.86 0.73 6.89 (36.7) 169.6 514.5 27.4 (14.2) $ 1,154.0 $ (0.80) 3.69 11.18 0.60 (0.31) 25.08 Adjusted Earnings (Loss) $ (165.1) $ (3.64) $ 314.8 $ Net income (loss) effects of financial guarantee VIE consolidation: VIEs that were consolidated as a result of financial guarantees provided by Ambac are accounted for on a fair value basis. Included within Net income (loss) attributable to common stockholders of these consolidated VIEs was $19.7 million, $(14.1) million, and $31.6 million for the years ended December 31, 2017, 2016 and 2015, respectively. Had these financial guarantee VIEs been accounted for under the provisions of the Financial Services - Insurance Topic of the ASC, the impact would have been $50.3 million, $147.6 million and $42.7 million for the years ended December 31, 2017, 2016 and 2015, respectively. The net impact of these different accounting bases on Net income attributable to common stockholders (including per share amounts) was $30.7 million ($0.68 per share), $161.7 million ($3.54 per diluted share), $11.1 million and ($0.24 per diluted share), for the years ended December 31, 2017, 2016 and 2015, respectively. This is supplemental information only and is not a component of Adjusted Earnings. Adjusted Book Value. Adjusted Book Value is defined as Total Ambac Financial Group, Inc. stockholders’ equity as reported under GAAP, adjusted for after-tax impact of the following: • Non-credit impairment fair value losses on credit derivatives: Elimination of the non-credit impairment fair value loss on credit derivatives, which is the amount in excess of the present value of the expected estimated economic credit loss. GAAP fair values are affected by, and in part fluctuate with, changes in market factors such as interest rates, credit spreads, including Ambac’s CVA that are not expected to result in an economic gain or loss. These adjustments allow for all financial guarantee contracts to be accounted for within Adjusted Book Value consistent with the provisions of the Financial Services—Insurance Topic of the ASC, whether or not they are subject to derivative accounting rules. emergence • Insurance intangible asset: Elimination of the financial guarantee insurance intangible asset that arose as a result of Ambac’s the from implementation of Fresh Start reporting. This adjustment ensures that all financial guarantee contracts are accounted for within Adjusted Book Value consistent with the provisions of the Financial Services—Insurance Topic of the ASC. bankruptcy and • Ambac CVA on interest rate derivative liabilities: Elimination of the gain relating to Ambac’s CVA on interest rate derivative contracts. Similar to credit derivatives, fair values include the market’s perception of Ambac’s credit risk and this adjustment only allows for such gain when realized. • Net unearned premiums and fees in excess of expected losses: Addition of the value of the unearned premium revenue ("UPR") on financial guarantee contracts, in excess of expected losses, net of reinsurance. This non-GAAP adjustment presents the economics of UPR and expected losses for financial guarantee contracts on a consistent basis. In accordance with GAAP, stockholders’ equity reflects a reduction for expected losses only to the extent they exceed UPR. However, when expected losses are less than UPR for a financial guarantee contract, neither expected losses nor UPR have an impact on stockholders’ equity. This non-GAAP adjustment adds UPR in excess of expected losses, net of reinsurance, to stockholders’ equity for financial guarantee contracts where expected losses are less than UPR. | Ambac Financial Group, Inc. 68 2017 FORM 10-K | • Net unrealized investment (gains) losses in Accumulated Other Comprehensive Income: Elimination of the unrealized gains and losses on the Company’s investments that are recorded accumulated other comprehensive income (“AOCI”). The AOCI component of the fair value adjustment on the investment portfolio may component of as a differ from realized gains and losses ultimately recognized by the Company based on the Company’s investment strategy. This adjustment only allows for such gains and losses in Adjusted Book Value when realized. The following table reconciles Total Ambac Financial Group, Inc. stockholders’ equity to the non-GAAP measure Adjusted Book Value on a total dollar amount and per share basis, for all periods presented: ($ in millions, except per share data) December 31, $ Amount Per Share $ Amount Per Share Total Ambac Financial Group, Inc. stockholders’ equity $ 1,381.1 $ 30.52 $ 1,713.9 $ 37.94 2017 2016 Adjustments: Non-credit impairment fair value losses on credit derivatives Insurance intangible asset Ambac CVA on interest rate derivative liabilities Net unearned premiums and fees in excess of expected losses Net unrealized investment (gains) losses in Accumulated Other Comprehensive Income Adjusted Book Value 0.6 (847.0) — 597.3 (30.8) 0.01 (18.71) — 13.20 (0.68) 11.4 (962.1) (44.9) 732.2 (118.9) $ 1,101.3 $ 24.34 $ 1,331.7 $ 0.25 (21.30) (0.99) 16.21 (2.63) 29.48 Stockholders' equity effects of financial guarantee VIE consolidation: VIEs that were consolidated as a result of financial guarantees provided by Ambac are accounted for on a fair value basis. The impact on Total Ambac Financial Group, Inc. stockholders' equity of these consolidated VIEs was $134.1 million and $132.4 million at December 31, 2017 and 2016, respectively. Had these financial guarantee VIEs been accounted for under the provisions of the Financial Services Insurance Topic of the ASC, the impact on AFG stockholders' equity would have been $178.7 million and $139.2 million at December 31, 2017 and 2016, respectively. The net change of these different accounting bases (including per share amounts) was $44.6 million ($0.99 per share) and $6.7 million ($0.15 per share), at December 31, 2017 and 2016, respectively. This is supplemental information only and is not a component of Adjusted Book Value. Factors that impact changes to Adjusted Book Value include many of the same factors that impact Adjusted Earnings, including the majority of revenues and expenses, but generally exclude components of premium earnings since they are embedded in prior period's Adjusted Book Value through the net unearned premiums and fees in excess of expected losses adjustment. Net unearned premiums and fees in excess of expected losses will affect Adjusted Book Value for (i) changes to future premium assumptions (e.g. expected term, interest rates, foreign currency rates, time passage) and (ii) changes to expected losses for policies which do not exceed their related unearned premiums. The Adjusted Book Value decrease from December 31, 2016 to December 31, 2017 was primarily driven by Adjusted earnings. | Ambac Financial Group, Inc. 69 2017 FORM 10-K | PRO FORMA BALANCE SHEET AND PRO FORMA ADJUSTED BOOK VALUE The following unaudited pro forma consolidated balance sheet of Ambac as of December 31, 2017, is based on the historical consolidated financial statements of Ambac giving effect to the Rehabilitation Exit Transactions as further described in Note 1. Background and Business Description and Note 17. Subsequent Events of the Consolidated Financial Statements in Part II, Item 8 of this Form 10-K. The unaudited pro forma consolidated balance sheet of Ambac includes unaudited pro forma adjustments that are driven by assumptions and factually supportable information directly attributable to the Rehabilitation Exit Transactions and the Tier 2 Notes Issuance as if they occurred on December 31, 2017 rather than February 12, 2018. AMBAC FINANCIAL GROUP, INC. PRO FORMA CONDENSED CONSOLIDATED GAAP BALANCE SHEET (Unaudited) December 31, 2017 Adjustments Pro forma December 31, 2017 (dollars in millions) Assets: Total non-variable interest entity investments, cash and cash equivalents $ 6,364 $ Subrogation recoverable Other assets Total VIE assets Total assets Liabilities and Stockholders' Equity: Liabilities: Loss and loss expense reserve Long-term debt Accrued interest payable Other liabilities Total VIE liabilities Total liabilities Stockholders' equity $ $ 631 1,696 14,501 23,192 $ 4,745 $ 992 437 1,007 14,366 21,547 1,645 (1) (2) (3) (1,786) 1,312 (9) — (483) (2,555) 1,952 (224) (2) (4) (4) — — (827) 344 (2)(5)(6) Total liabilities and stockholders' equity $ 23,192 $ (483) (1) The net cash and investment outflows reflects the distributions under the Rehabilitation Exit Transactions as follows: (dollars in millions) Cash payment to third parties for settlement of Deferred Amounts and Surplus Notes Cash payment for unpaid claims presented after record date Cash payment for one-time current interest payment on remaining surplus notes Cash payment for remaining debt issuance costs Receipt of Tier 2 proceeds Receipt of Secured Notes issued by Ambac LSNI Reduction in value of Ambac-insured RMBS securities held in the investment portfolio $ $ $ $ $ $ 4,578 1,943 1,687 14,501 22,710 2,190 2,944 213 1,007 14,366 20,720 1,989 22,710 (1,347) (30) (11) (8) 240 764 (1,394) (1,786) (2) The transactions pursuant to the Second Amended Plan of Rehabilitation where Ambac is settling its unpaid claims at a discount is being accounted for as an extinguishment, where the discount of approximately $287 is reflected in the pro forma consolidated balance sheet as an increase to Retained Earnings. As a result of the settlement, future net cash flows on certain policies will become an asset and are reclassified to Subrogation recoverable. (3) Reflects the reclass of previously capitalized costs directly associated with the issuance of the Ambac Notes or Tier 2 Notes to Long-term debt that will be amortized as part of the effective yield calculation. (4) The discount received in the other Rehabilitation Exit Transactions are being accounted for as a debt modification since the creditors before and after the discount remain the same and the change in the terms is not considered substantial. A substantial change is considered to be a change in cash flows of equal to or greater than 10% as a result of the modification of terms. As the change in cash flows is less than 10%, debt modification accounting is appropriate. Under debt modification accounting, no gain or loss is recorded, and a new effective interest rate is established based on the Ambac Note cash flows. Additionally, any consideration paid that is directly related to the issuance of the Ambac Note is capitalized and amortized as part of the effective yield calculation. The net long-term debt increase reflects the impact of the Rehabilitation Exit Transactions as follows: | Ambac Financial Group, Inc. 70 2017 FORM 10-K | (dollars in millions) Tier 2 Notes issuance Ambac Note issuance Cash payment for on-time current interest payment on remaining surplus notes Deferred loss on Rehabilitation Exit Transactions and debt issuance costs Reduction in carrying value of Surplus Notes Long-term Debt Accrued Interest Payable $ $ 240 $ 2,145 — (20) (413) 1,952 $ — — (11) — (213) (224) (5) As a result of the Rehabilitation Exit Transactions, Ambac will receive settlement of its ownership in Deferred Amounts and would realize a gain of $57 over the carrying value of the associated Ambac-insured RMBS as of December 31, 2017. (6) This pro forma information does not incorporate any assumptions regarding taxes. The following table reconciles total Ambac Financial Group, Inc. stockholders' equity to the non-GAAP measure Adjusted Book Value. PROFORMA ADJUSTED BOOK VALUE Reported Pro Forma Post Restructuring (1) December 31, 2017 December 31, 2017 Change ($ in millions, except per share data) $ Amount Per Share $ Amount Per Share $ Amount Per Share Total AFGI Shareholders' Equity $ 1,381.1 $ 30.52 $ 1,725.2 38.08 $ 344.0 $ 7.56 Adjustments: Non-credit impairment unrealized fair value losses on credit derivatives Insurance intangible asset Net unearned premiums and fees in excess of expected losses Net unrealized investment (gains) losses in AOCI Adjusted book value Shares Outstanding (in millions) 0.6 (847.0) 0.01 (18.71) 0.6 (847.0) 0.01 (18.71) 597.3 13.20 597.3 13.20 (30.8) (0.68) (30.8) (0.68) — — — — — — — — $ 1,101.3 $ 24.34 $ 1,445.3 $ 31.90 $ 344.0 $ 7.56 45.3 45.3 (1) Pro forma amounts are estimates, subject to revisions and are not reflective of actual or future operating results. Item 7A. Quantitative and Qualitative Disclosures about Market Risk Market risk represents the potential for losses that may result from changes in the value of a financial instrument as a result of changes in market conditions. The primary market risks that would impact the value of Ambac’s financial instruments are interest rate risk, credit spread risk and foreign currency risk. Below we discuss each of these risks and the specific types of financial instruments impacted. Senior managers are responsible for developing and applying methods to measure risk. Ambac utilizes various systems, models and sensitivity scenarios to monitor and manage market risk. These models include estimates, made by management, which utilize current and historical market information. The valuation results from these models could differ materially from amounts that would actually be realized in the market. Financial instruments of VIEs that are consolidated as a result of Ambac's financial guarantees are excluded from the market risk measures below. Interest Rate Risk: Financial instruments for which fair value may be affected by changes in interest rates consist primarily of fixed income investment securities, long-term debt and interest rate derivatives. Fixed income investment securities that are guaranteed by Ambac have interest rate risk characteristics that behave inversely to those associated with future financial guarantee claim payments. Accordingly, such securities are excluded from the interest rate sensitivity table below. Changes in fair value resulting from changes in interest rates are driven primarily by the impact of interest rate shifts on the investment portfolio (which produce net fair value losses as rates increase) and long-term debt and the interest rate derivatives portfolio (which produce net fair value gains as rates increase). Interest rate increases would also have a negative economic impact on expected future claim payments within the financial guarantee portfolio. Ambac performs scenario testing to measure the potential for losses in volatile markets. These scenario tests include parallel and non-parallel shifts in the benchmark interest rate curve. The interest rate derivatives portfolio is managed as an economic hedge against the effects of rising interest rates elsewhere in the Company, including on Ambac's financial guarantee exposures (the "macro-hedge"). As a result of the commutation of certain financial guarantee customer swaps in June 2017, the macro-hedge encompasses the entire interest rate derivatives portfolio as of December 31, 2017. The interest rate sensitivity of the interest rate derivatives portfolio attributable to the macro-hedge position would produce mark-to-market gains or losses of approximately | Ambac Financial Group, Inc. 71 2017 FORM 10-K | $0.8 million for a 1 basis point parallel shift in USD benchmark interest rates up or down at December 31, 2017. The following table summarizes the estimated change in fair value (based primarily on the valuation methodology discussed in Note 9. Fair Value Measurements to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K) on these financial instruments, assuming immediate changes in interest rates at specified levels at December 31, 2017: ($ in millions) Estimated change in net fair value Estimated net fair value (1) Incorporates an interest rate floor of 0% Change in Interest Rates 300 basis point rise 200 basis point rise 100 basis point rise Base scenario 100 basis point decline(1) 200 basis point decline(1) $ $ 181 871 121 811 60 750 — 690 (61) 629 (123) 567 Due to the low interest rate environment as of December 31, 2017, stress scenarios involving interest rate declines greater than 200 basis points are not meaningful to Ambac's portfolios. Credit Spread Risk: Financial instruments that may be adversely affected by changes in spreads include Ambac’s outstanding credit derivative contracts, certain interest rate derivatives and investment assets. Changes in spreads are generally caused by changes in the market’s perception of the credit quality of the underlying obligor. Market liquidity and ($ in millions) Estimated change in fair value Estimated fair value Also included in the fair value of credit derivative liabilities is the effect of Ambac’s creditworthiness, which reflects market perception of Ambac’s ability to meet its obligations. Incorporating estimates of Ambac’s credit valuation adjustment into the determination of fair value has resulted in less than $0.1 million reduction to the credit derivatives liability as of December 31, 2017. At December 31, 2017 the credit valuation adjustment resulted in a 9.6% reduction of the credit derivative liability as measured before considering Ambac credit risk. Refer to Note 9. Fair Value Measurements the Consolidated Financial to Statements included in Part II, Item 8 in this Form 10-K for further information on measurement of the credit valuation adjustment. The fair value of interest rate derivatives may also be affected by changes to the credit valuation adjustment attributable to the risk of Ambac non-performance. Generally, the need for an Ambac credit valuation adjustment is mitigated by the existence of collateral posting agreements under which adequate collateral has been posted. Derivative contracts entered into with credit exposure to financial guarantee customers are not typically subject to collateral posting agreements. As a result of the commutation of certain derivatives in June 2017, there are no significant liabilities as of uncollateralized rate derivative interest prevailing risk premiums demanded by market participants are also reflected in spreads and impact valuations. The following table summarizes the estimated change in fair values on Ambac’s net derivative liabilities assuming immediate parallel shifts in reference obligation credit spreads related to written credit derivatives and counterparty credit to uncollateralized interest rate derivatives at December 31, 2017. It is more likely that actual changes in credit spreads will vary by obligor: spreads related Change in Obligor Spreads 250 basis point widening 50 basis point widening Base scenario 50 basis point narrowing 250 basis point narrowing $ $ (23) (33) (5) (15) — (10) 4 (6) 7 (3) December 31, 2017. Therefore, Ambac’s credit valuation adjustment included in the fair value of interest rate derivatives was $0.0 million as of December 31, 2017. As a result of declines in uncollateralized interest rate and credit default swap liabilities during 2017, changes in Ambac credit spreads as much as 250 basis points would result in less than a $1 million impact to the fair value of derivatives at December 31, 2017. Ambac’s fixed income investment portfolio contains securities with different sensitivities to and volatility of spreads. Fixed income securities that are guaranteed by Ambac and were purchased in Ambac's investment portfolio have credit spread risk characteristics that behave inversely to those associated with future financial guarantee claim payments. Accordingly such securities are excluded from the company's spread sensitivity measures. The following table summarizes the estimated change in fair values of Ambac’s fixed income investment portfolio assuming immediate shifts in credit spreads across all holdings other than Ambac guaranteed securities at December 31, 2017. It is more likely that actual changes in credit spreads will vary by security: ($ in millions) Estimated change in fair value Estimated fair value Change in Spreads 250 basis point widening 50 basis point widening Base scenario 50 basis point narrowing 250 basis point narrowing $ $ (149) 2,596 (30) 2,715 — 2,745 31 2,776 84 2,829 | Ambac Financial Group, Inc. 72 2017 FORM 10-K | Foreign Currency Risk: Ambac has financial instruments denominated in currencies other than the U.S. dollar, primarily pounds sterling and euros. These financial instruments are primarily invested assets of Ambac UK and credit derivative contracts. The following table summarizes the estimated net change in fair value of these financial instruments assuming immediate shifts in spot foreign exchange rates to U.S. dollars as of December 31, 2017. ($ in millions) Estimated change in fair value Change in Foreign Exchange Rates Against U.S. Dollar 20% Decrease 10% Decrease 10% Increase 20% Increase $ (67) $ (34) $ 34 $ 67 | Ambac Financial Group, Inc. 73 2017 FORM 10-K | Item 8. Financial Statements and Supplementary Data AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES INDEX TO CONSOLIDATED FINANCIAL STATEMENTS Reports of Independent Registered Public Accounting Firm .............................................................................................................. Consolidated Balance Sheets............................................................................................................................................................... Consolidated Statements of Total Comprehensive Income (Loss)...................................................................................................... Consolidated Statements of Stockholders’ Equity............................................................................................................................... Consolidated Statements of Cash Flows.............................................................................................................................................. Notes to Consolidated Financial Statements Note 1. Background and Business Description................................................................................................................................. Note 2. Basis of Presentation and Significant Accounting Policies.................................................................................................. Note 3. Special Purpose Entities, Including Variable Interest Entities ............................................................................................. Note 4. Comprehensive Income........................................................................................................................................................ Note 5. Net Income Per Share........................................................................................................................................................... Note 6. Financial Guarantees in Force.............................................................................................................................................. Note 7. Financial Guarantee Insurance Contracts............................................................................................................................. Note 8. Insurance Regulatory Restrictions ....................................................................................................................................... Note 9. Fair Value Measurements..................................................................................................................................................... Note 10. Investments......................................................................................................................................................................... Note 11. Derivative Instruments ....................................................................................................................................................... Note 12. Loans .................................................................................................................................................................................. Note 13. Long-term Debt .................................................................................................................................................................. Note 14. Income Taxes...................................................................................................................................................................... Note 15. Employment Benefit Plans................................................................................................................................................. Note 16. Commitments and Contingencies....................................................................................................................................... Note 17. Subsequent Events.............................................................................................................................................................. Note 18. Quarterly Information (Unaudited) .................................................................................................................................... Page 75 77 78 79 80 81 85 98 103 104 104 106 113 116 128 134 136 136 138 141 145 155 156 | Ambac Financial Group, Inc. 74 2017 FORM 10-K | Report of Independent Registered Public Accounting Firm The the Stockholders and Board of Directors Ambac Financial Group, Inc.: Opinion on Internal Control Over Financial Reporting We have audited Ambac Financial Group, Inc. and subsidiaries' (the Company) internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 2017 and 2016, the related consolidated statements of total comprehensive income (loss), stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2017, and the related notes and financial statement schedules (collectively, the consolidated financial statements), and our report dated February 28, 2018 expressed an unqualified opinion on those consolidated financial statements. Basis for Opinion The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion. Definition and Limitations of Internal Control Over Financial Reporting A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. /s/ KPMG LLP New York, New York February 28, 2018 | Ambac Financial Group, Inc. 75 2017 FORM 10-K | Report of Independent Registered Public Accounting Firm To the Stockholders and Board of Directors Ambac Financial Group, Inc.: Opinion on the Consolidated Financial Statements We have audited the accompanying consolidated balance sheets of Ambac Financial Group, Inc. and subsidiaries (the Company) as of December 31, 2017 and 2016, the related consolidated statements of total comprehensive income (loss), stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2017, and the related notes and financial statement schedules (collectively, the consolidated financial statements). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2017 and 2016, and the results of its operations and its cash flows for each of the years in the three-year period ended December 31, 2017, in conformity with U.S. generally accepted accounting principles. We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our report dated February 28, 2018 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting. Basis for Opinion These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion. /s/ KPMG LLP We have served as the Company’s auditor since 1985. New York, New York February 28, 2018 | Ambac Financial Group, Inc. 76 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Consolidated Balance Sheets (Dollars in thousands, except share data) December 31, 2017 2016 Assets: Investments: Fixed income securities, at fair value (amortized cost of $4,614,623 and $5,435,385) Fixed income securities pledged as collateral, at fair value (amortized cost of $99,719 and $64,833) Short-term investments, at fair value (amortized cost of $557,476 and $430,827) Other investments (includes $396,689 and $420,304 at fair value) Total investments Cash and cash equivalents Receivable for securities Investment income due and accrued Premium receivables Reinsurance recoverable on paid and unpaid losses Deferred ceded premium Subrogation recoverable Loans Derivative assets Current taxes Insurance intangible asset Other assets Variable interest entity assets: Fixed income securities, at fair value Restricted cash Loans, at fair value Derivative assets Other assets Total assets Liabilities and Stockholders’ Equity: Liabilities: Unearned premiums Loss and loss expense reserves Ceded premiums payable Obligations under investment agreements Deferred taxes Current taxes Long-term debt Accrued interest payable Derivative liabilities Other liabilities Payable for securities purchased Variable interest entity liabilities: Accrued interest payable Long-term debt, at fair value Derivative liabilities Other liabilities Total liabilities Commitments and contingencies (See Note 16) Stockholders’ equity: Preferred stock, par value $0.01 per share; 20,000,000 shares authorized shares; issued and outstanding shares—none Common stock, par value $0.01 per share; 130,000,000 shares authorized; issued and outstanding shares: 45,275,982 and 45,194,954 Additional paid-in capital Accumulated other comprehensive income (loss) Retained earnings Treasury stock, shares at cost: 24,816 and 22,458 Total Ambac Financial Group, Inc. stockholders’ equity Noncontrolling interest Total stockholders’ equity Total liabilities and stockholders’ equity See accompanying Notes to Consolidated Financial Statements $ $ $ $ $ $ $ 4,652,172 99,719 557,270 431,630 5,740,791 623,703 11,177 16,532 586,312 40,997 52,195 631,213 10,358 73,199 11,803 846,973 46,614 2,914,145 978 11,529,384 54,877 1,123 23,192,374 783,155 4,745,015 37,876 — 33,659 — 991,696 436,984 82,782 67,583 1,932 589 12,160,544 2,205,264 37 21,547,116 — 453 199,560 (52,239) 1,233,845 (471) 1,381,148 264,110 1,645,258 23,192,374 $ 5,554,215 64,905 430,788 450,307 6,500,215 91,025 2,090 26,023 661,337 30,418 69,624 684,731 4,160 77,742 — 962,080 158,423 2,622,566 4,873 10,658,963 80,407 1,025 22,635,702 967,258 4,380,769 42,529 82,358 1,720 14,280 1,114,405 421,975 319,286 76,589 1,084 859 11,155,936 2,078,601 29 20,657,678 — 452 195,267 (38,990) 1,557,681 (496) 1,713,914 264,110 1,978,024 22,635,702 | Ambac Financial Group, Inc. 77 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Consolidated Statements of Total Comprehensive Income (Loss) (Dollars in thousands, except share data) Year Ended December 31, 2017 2016 2015 $ 175,277 $ 197,287 $ 312,595 Revenues: Net premiums earned Net investment income: Securities available-for-sale and short-term Other investments Total net investment income Other-than-temporary impairment losses: Total other-than-temporary impairment losses Portion of other-than-temporary impairment recognized in other comprehensive income Net other-than-temporary impairment losses recognized in earnings Net realized investment gains (losses) Change in fair value of credit derivatives: Realized gains and other settlements Unrealized gains (losses) Net change in fair value of credit derivatives Net gains (losses) on interest rate derivatives Net realized gains (losses) on extinguishment of debt Other income (expense) Income (loss) on variable interest entities Total revenues Expenses: Losses and loss expenses (benefit) Insurance intangible amortization Operating expenses Interest expense Goodwill impairment Total expenses Pre-tax income (loss) Provision for income taxes Net income (loss) Less: net gain (loss) attributable to noncontrolling interest Net income (loss) attributable to common shareholders Other comprehensive income (loss), after tax: Net income (loss) Unrealized gains (losses) on securities, net of deferred income taxes of $0 Gains (losses) on foreign currency translation, net of deferred income taxes of $0 Changes to postretirement benefit, net of tax of $0 Total other comprehensive income (loss), net of tax Total comprehensive income (loss) Less: comprehensive (loss) gain attributable to the noncontrolling interest: Net gain (loss) Currency translation adjustments Total comprehensive income (loss) attributable to Ambac Financial Group, Inc. Net income (loss) attributable to Ambac Financial Group, Inc. common shareholders Basic Diluted See accompanying Notes to Consolidated Financial Statements $ $ $ $ $ 337,774 23,179 360,953 (54,625) 34,454 (20,171) 5,366 1,589 14,783 16,372 59,565 4,920 (706) 19,670 621,246 513,186 150,854 121,516 119,941 — 905,497 (284,251) 44,464 (328,715) — (328,715) $ (328,715) $ (81,520) 73,586 1,273 (6,661) (335,376) — — (335,376) $ 281,049 32,318 313,367 (89,700) 67,881 (21,819) 39,284 912 19,194 20,106 (50,273) 4,845 17,445 (14,093) 506,149 (11,489) 174,608 113,660 124,344 — 401,123 105,026 30,709 74,317 (526) 74,843 74,317 67,900 (122,128) 23 (54,205) 20,112 (526) — 20,638 (7.25) $ (7.25) $ 1.66 1.64 $ $ $ $ $ 249,337 16,952 266,289 (66,692) 41,033 (25,659) 53,476 2,785 38,916 41,701 (42,544) 81 7,150 31,569 644,658 (768,707) 169,557 102,702 116,537 514,511 134,600 510,058 17,364 492,694 (709) 493,403 492,694 (159,730) (45,025) (687) (205,442) 287,252 (709) (374) 288,335 10.92 10.72 | Ambac Financial Group, Inc. 78 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Consolidated Statements of Stockholders’ Equity (Dollars in thousands) Total Ambac Financial Group, Inc. Retained Earnings Accumulated Other Comprehensive Income (Loss) Preferred Stock Common Stock Additional Paid-in Capital Common Stock Held in Treasury, at Cost Noncontrolling Interest Balance at January 1, 2017 $ 1,978,024 $ 1,557,681 $ (38,990) $ — $ 452 $ 195,267 $ (496) $ 264,110 — — — — 25 — — — — — — — — (471) $ — 264,110 (118) $ 273,547 — — — (378) — — — — (496) $ (526) (6,442) — — — — (2,469) — 264,110 (56) $ 274,630 — — (62) — (1,083) — — — — (118) $ — 273,547 $ $ $ $ $ Total comprehensive income (335,376) (328,715) Adjustment to initially apply ASU 2018-02 Adjustment to initially apply ASU 2016-09 Stock-based compensation Cost of shares (acquired) issued under equity plan Cost of warrants acquired — 6,588 (137) 4,293 (137) — (1,547) (1,572) — — Issuance of common stock 1 Balance at December 31, 2017 $ 1,645,258 — $ 1,233,845 Balance at January 1, 2016 $ 1,958,346 $ 1,478,439 (6,661) (6,588) — — — — — — — — — — — — — — — — — — — 4,293 — — — (52,239) $ — — $ 1 453 — 199,560 $ 15,215 $ — $ 450 $ 190,813 $ $ Total comprehensive income 20,112 74,843 (54,205) — — — — — 2 — — 452 $ $ — — 5,253 — (801) — — 2 195,267 189,138 — 3,105 — (1,433) 3 190,813 Adjustment to initially apply ASU 2014-13 Stock-based compensation Cost of shares (acquired) issued under equity plan Cost of warrants acquired Issuance of common stock Deconsolidation of a variable interest entity — 5,253 (505) (2,717) 2 (2,469) 6,442 — (127) (1,916) — — Warrants exercised 2 Balance at December 31, 2016 $ 1,978,024 — $ 1,557,681 Balance at January 1, 2015 $ 1,673,735 $ 989,290 $ $ — — — — — — — — — — — — — — (38,990) $ — — $ 220,283 $ — $ 450 Total comprehensive income Stock-based compensation Cost of shares (acquired) issued under equity plan Cost of warrants acquired 287,252 3,105 (374) (5,375) 493,403 (205,068) — (312) (3,942) — — — — — — — — — — — Warrants exercised 3 Balance at December 31, 2015 $ 1,958,346 — $ 1,478,439 $ — 15,215 $ — — $ — 450 $ See accompanying Notes to Consolidated Financial Statements | Ambac Financial Group, Inc. 79 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Consolidated Statements of Cash Flows 2017 2016 2015 $ (328,715) $ 74,843 $ (Dollars in thousands) Year Ended December 31, Cash flows from operating activities: Net income (loss) attributable to common shareholders Noncontrolling interest in subsidiaries’ earnings Net income (loss) Adjustments to reconcile net income to net cash used in operating activities: Depreciation and amortization Impairment of goodwill Amortization of bond premium and discount Share-based compensation Deferred income taxes Current income taxes Unearned premiums, net Losses and loss expenses, net Ceded premiums payable Investment income due and accrued Premium receivables Accrued interest payable Amortization of insurance intangible assets Net mark-to-market (gains) losses Net realized investment gains Other-than-temporary impairment charges (Gain) loss on extinguishment of debt Variable interest entity activities Derivative assets and liabilities Other, net Net cash provided by (used in) operating activities Cash flows from investing activities: Proceeds from sales of bonds Proceeds from matured bonds Purchases of bonds Proceeds from sales of other invested assets Purchases of other invested assets Change in short-term investments Loans, net Change in cash collateral receivable Other, net Net cash provided by (used in) investing activities Cash flows from financing activities: Net proceeds received from a secured borrowing Paydowns of a secured borrowing Payments for investment agreement draws Payments for extinguishment of long-term debt Tax payments related to shares withheld for share-based compensation plans Proceeds from warrant exercises Cost of warrants acquired Net cash used in financing activities Effect of foreign exchange on cash and cash equivalents Net cash flow Cash and cash equivalents at beginning of period Cash and cash equivalents end of period See accompanying Notes to Consolidated Financial Statements $ | Ambac Financial Group, Inc. 80 2017 FORM 10-K | — (328,715) 992 — (182,997) 4,293 31,939 (26,272) (168,208) 399,982 (4,653) 9,425 76,900 49,969 150,854 (14,783) (5,366) 20,171 (4,920) (19,670) (223,247) 21,538 (212,768) 2,138,936 813,990 (2,053,693) 349,799 (299,424) (126,891) (6,198) 122,844 (10,594) 928,769 — (28,992) (82,358) (69,499) (1,268) — — (182,117) (1,206) 532,678 91,025 623,703 (526) 74,317 1,220 — (150,061) 5,253 (485) 9,727 (289,140) 853,978 (10,965) (750) 172,331 66,439 174,608 (19,194) (39,284) 21,819 (4,845) 14,093 (7,625) (27,896) 843,540 867,882 1,317,215 (2,574,285) 131,703 (281,570) (206,002) 1,046 27,372 1,996 (714,643) — (29,482) (17,964) (19,550) — 2 (2,717) (69,711) (3,905) 55,281 35,744 91,025 $ $ 493,403 (709) 492,694 3,215 514,511 (129,584) 3,104 126 134 (372,907) (799,399) (6,942) (280) 174,918 51,397 169,557 (38,916) (53,476) 25,659 (81) (31,569) 9,352 80,296 91,809 996,427 1,029,026 (2,374,441) 178,474 (128,186) 134,423 508 (6,833) (5,143) (175,745) 143,430 (13,533) (63,872) (13,752) — 3 (5,375) 46,901 (1,124) (38,159) 73,903 35,744 AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) 1. BACKGROUND AND BUSINESS DESCRIPTION Background: Ambac Financial Group, Inc. (“Ambac” or the “Company”), headquartered in New York City, is a financial services holding company that was incorporated in the state of Delaware on April 29, 1991. On May 1, 2013 (the “Reorganization Effective Date”), Ambac emerged from Chapter 11 bankruptcy protection when the Second Modified Fifth Amended Plan of Reorganization of Ambac Financial Group, Inc. (the “Reorganization Plan”) became effective. On December 26, 2013, the United States Bankruptcy Court for the Southern District of New York (the “Bankruptcy Court”) entered an order of final decree closing Ambac’s Chapter 11 case. Ambac filed a voluntary petition for relief under Chapter 11 of the United States Bankruptcy Code (the “Bankruptcy Code”) in the Bankruptcy Court on November 8, 2010 as a result of losses incurred since the beginning of the financial crisis in 2007. As provided for in the Reorganization Plan, Ambac’s Amended and Restated Certificate of Incorporation and revised Bylaws became effective on the Reorganization Effective Date. Pursuant to the Amended and Restated Certificate of Incorporation of Ambac, Ambac is authorized to issue 150,000,000 shares of capital stock, consisting of 130,000,000 shares of common stock, par value $0.01 per share and 20,000,000 shares of preferred stock, par value $0.01 per share. Pursuant to the Reorganization Plan, Ambac distributed 45,000,000 shares of new common stock on May 1, 2013 and distributed warrants to holders of allowed general unsecured claims and subordinated debt securities, which as of the Reorganization Effective Date entitled such holders to acquire an additional 5,047,138 shares of new common stock of the Company at an exercise price of $16.67 per share at any time on or prior to April 30, 2023. The new common stock and warrants are listed on NASDAQ and trade under the symbols “AMBC” and “AMBCW,” respectively. All such common stock and warrants were issued without registration under the Securities Act of 1933, as amended or state securities laws, in reliance on Section 1145 of the United States Bankruptcy Code. The common stock of the Company in existence prior to the Reorganization Effective Date was cancelled on the Reorganization Effective Date. Ambac’s Amended and Restated Certificate of Incorporation limits voting and transfer rights of stockholders in significant ways. Article IV contains voting restrictions applicable to any person owning at least 10% of Ambac’s common stock so that such person (including any group consisting of such person and any other person with whom such person or any affiliate or associate of such person has any agreement, contract, arrangement or understanding with respect to acquiring, voting, holding or disposing of Ambac’s common stock) shall not be entitled to cast votes in excess of one vote less than 10% of the votes entitled to be cast by all common stock holders, except as otherwise approved by the Office of the Commissioner of Insurance for the State of Wisconsin (“OCI” (which term shall be understood to refer to such office as regulator of Ambac Assurance and to refer to the Commissioner of Insurance for the State of Wisconsin as rehabilitator of the Segregated Account (the “Rehabilitator”), as the context requires)). There are substantial restrictions on the ability to transfer Ambac’s common stock set forth in Article XII of Ambac’s Amended and Restated Certificate of Incorporation. In order to preserve certain tax benefits, subject to limited exceptions, any attempted transfer of common stock shall be prohibited and void to the extent that, as a result of such transfer (or any series of transfers of which such transfer is a part), either (i) any person or group of persons shall become a holder of 5% or more of the Company’s common stock or (ii) the percentage stock ownership interest in Ambac of any holder of 5% or more of the Company’s common stock shall be increased (a “Prohibited Transfer”). These restrictions shall not apply to an attempted transfer if the transferor or the transferee obtains the written approval of Ambac’s Board of Directors to such transfer. A purported transferee of a Prohibited Transfer shall not be recognized as a stockholder of Ambac for any purpose whatsoever in respect of the securities which are the subject of the Prohibited Transfer (the “Excess Securities”). Until the Excess Securities are acquired by another person in a transfer that is not a Prohibited Transfer, the purported transferee of a Prohibited Transfer shall not be entitled with respect to such Excess Securities to any rights of stockholders of Ambac, including, without limitation, the right to vote such Excess Securities and to receive dividends or distributions, whether liquidating or otherwise, in respect thereof, if any. Once the Excess Securities have been acquired in a transfer that is not a Prohibited Transfer, the securities shall cease to be Excess Securities. If the Board determines that a transfer of securities constitutes a Prohibited Transfer then, upon written demand by Ambac, the purported transferee shall transfer or cause to be transferred any certificate or other evidence of ownership of the Excess Securities within the purported transferee’s possession or control, together with any distributions paid by Ambac with respect to such Excess Securities, to an agent designated by Ambac. Such agent shall thereafter sell such Excess Securities and the proceeds of such sale shall be distributed as set forth in the Amended and Restated Certificate of Incorporation. If the purported transferee of a Prohibited Transfer has resold the Excess Securities before receiving such demand, such person shall be deemed to have sold the Excess Securities for Ambac’s agent and shall be required to transfer to such agent the proceeds of such sale, which shall be distributed as set forth in the Amended and Restated Certificate of Incorporation. As of the Reorganization Effective Date, the Company was generally discharged and released from all pre-Reorganization Effective Date debts, liabilities, claims, causes of action and interests in accordance with the provisions of the Reorganization Plan. Holders of claims and equity interests are also generally barred from commencing or continuing any action or proceeding relating to such claims, causes of action or interests. The Reorganization Plan also provides for broad exculpation and releases of the Company, Ambac Assurance, the Segregated Account (as defined below), OCI, the Rehabilitator, the board of directors and board committees of the Company and Ambac Assurance, all individual directors, officers and employees of the Company and Ambac Assurance, the Creditors’ Committee and the individual members thereof, and each of the respective representatives of such parties, for actions or omissions that occurred on or prior to the Reorganization Effective Date. | Ambac Financial Group, Inc. 81 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Business Description: Ambac’s provides financial guarantee insurance policies through its principal operating subsidiary, Ambac Assurance Corporation (“Ambac Assurance” or "AAC") and its wholly owned subsidiary, Ambac Assurance UK Limited (“Ambac UK”), both of which have been in runoff since 2008. Insurance policies issued by Ambac Assurance and Ambac UK generally guarantee payment when due of the principal and interest on the obligations guaranteed. Ambac Assurance also has another wholly-owned subsidiary, Everspan Financial Guarantee Corp. (“Everspan”), which has been in runoff since its acquisition in 1997. Ambac Assurance’s ability to pay dividends and, as a result, Ambac’s liquidity, have been significantly restricted by the deterioration of Ambac Assurance's financial condition, by the rehabilitation of the Segregated Account (as defined below) and by the terms of the Settlement Agreement, dated as of June 7, 2010 (the "Settlement Agreement"), by and among Ambac Assurance, Ambac Credit Products LLC (“ACP”), Ambac and certain counterparties to credit default swaps with ACP that were guaranteed by Ambac Assurance. Ambac Assurance is also restricted in its ability to pay dividends pursuant to regulatory restrictions, the terms of its Auction Market Preferred Shares, and the terms of the Stipulation and Order (described below). It is highly unlikely that Ambac Assurance will be able to make dividend payments to Ambac for the foreseeable future. Ambac also provides other financial products through subsidiaries of Ambac Assurance. These products consist of interest rate swaps, funding conduits and investment agreements (until the first quarter of 2017) that were provided principally to clients that were also provided financial guarantee policies. These financial products have been in active runoff since 2007. Prior to the second quarter of 2017, Ambac had two reportable business segments: i) the financial guarantee segment, which consisted of financial guarantee insurance policies and credit derivative contracts and ii) the financial services segment which consisted of the other financial products discussed above. With respect to the financial services segment, there were significant swap commutations in June 2017. The remaining interest rate swaps, along with other interest rate derivatives, are managed to economically hedge interest rate risk in the financial guarantee and investment portfolios. The last remaining investment agreement matured in March 2017 and the remaining conduit transactions are not material. The significant wind-down of these financial products, along with the appointment of a new Chief Executive Officer effective January 1, 2017, has resulted in a change in how the Company manages its business. Management now reviews financial information, allocates resources and measures financial performance on a consolidated basis. As a result, beginning with the second quarter of 2017, the Company has a single reportable segment. All prior period amounts and disclosures have been adjusted to reflect the reportable segment change. In February 2018, Ambac achieved one of its key strategic priorities, the exit from rehabilitation of the Segregated Account. Having accomplished this milestone, Ambac will continue to pursue and prioritize its remaining key strategic priorities, namely: • Active runoff of Ambac Assurance and its subsidiaries through transaction terminations, policy commutations, settlements and restructurings, with a focus on our watch list credits and known and potential future adversely classified credits, that we believe will improve our risk profile, and maximizing the risk-adjusted return on invested assets; • Ongoing rationalization of Ambac's and its subsidiaries' capital and liability structures; • Loss recovery through active litigation management and exercise of contractual and legal rights; • Ongoing review of organizational effectiveness and efficiency of the operating platform; and • Evaluation of opportunities in certain business sectors that meet acceptable criteria that will generate long-term stockholder value with attractive risk-adjusted returns. With respect to our new business strategy, we have identified certain business sectors adjacent to Ambac's core business in which future opportunities will be evaluated. The evaluation will be conducted through a measured and disciplined approach to identify opportunities that are synergistic to Ambac, match Ambac's core competencies, are rapidly scalable or available through mergers and acquisitions and that may allow for the utilization of Ambac's net operating loss carry-forwards. Although we are exploring new business opportunities, no assurance can be given that we will be able to execute, or obtain the financial and other resources that may be required to finance, the acquisition or development of any new businesses or assets. Furthermore, the execution of Ambac’s strategy to increase the value of its investment in Ambac Assurance is subject to the rights of OCI under the Stipulation and Order, which requires OCI to approve certain actions taken by or in respect of Ambac Assurance. Opportunities for remediating losses on poorly performing insured transactions also depend on market conditions, including the perception of Ambac Assurance’s creditworthiness, the structure of the underlying risk and associated policy as well as other counterparty specific factors. Decisions by OCI could impair Ambac’s ability to execute certain of its strategies. Ambac Assurance's ability to commute policies or purchase certain investments may also be limited by available liquidity. Due to these factors, as well as uncertainties relating to the ability of Ambac Assurance to deliver value to Ambac, the value of our securities remains speculative. The Segregated Account In March 2010, Ambac Assurance established a Segregated Account pursuant to Wisc. Stat. §611.24 (2) (the “Segregated Account”) to segregate certain segments of Ambac Assurance’s liabilities, and OCI commenced rehabilitation proceedings in the Dane County, Wisconsin Circuit Court (the “Rehabilitation Court”) with respect to the Segregated Account (the “Segregated Account Rehabilitation Proceedings”) in order to permit OCI to facilitate an orderly run-off and/or settlement of the liabilities allocated to the Segregated Account pursuant to the provisions | Ambac Financial Group, Inc. 82 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) of the Wisconsin Insurers Rehabilitation and Liquidation Act. On October 8, 2010, OCI filed a plan of rehabilitation for the Segregated Account (the “Segregated Account Rehabilitation Plan”) in the Rehabilitation Court. The Rehabilitation Court confirmed the Segregated Account Rehabilitation Plan on January 24, 2011. On June 11, 2014, the Rehabilitation Court approved amendments to the Segregated Account Rehabilitation Plan and the Segregated Account Rehabilitation Plan, as amended, became effective on June 12, 2014. Net par exposure as of December 31, 2017 for policies allocated to the Segregated Account was $9,246,357. Policy obligations not allocated to the Segregated Account remained in the General Account of Ambac Assurance, and such policies in the General Account were not subject to and, therefore, were not directly impacted by the Segregated Account Rehabilitation Plan. Rehabilitation Exit Transactions On July 19, 2017, Ambac Assurance and Ambac entered into an agreement (as amended as of September 21, 2017, the “Rehabilitation Exit Support Agreement”) with holders or beneficial owners (the “Supporting Holders”) of surplus notes issued by Ambac Assurance and beneficial interests in Deferred Amounts (as defined in the Segregated Account Rehabilitation Plan) of the Segregated Account with respect to a transaction which, subject to the conditions precedent set forth in the Rehabilitation Exit Support Agreement, and if consummated, would generally involve (i) the exchange of certain surplus notes held by holders of surplus notes that elect to participate in a voluntary exchange transaction and (ii) the satisfaction and discharge of all Deferred Amounts, in each case for an effective consideration package comprised of cash and new Secured Notes (as defined below) and certain existing surplus notes and (iii) the exit from rehabilitation of the Segregated Account and the merger of the Segregated Account with and into Ambac Assurance (the “Rehabilitation Exit Transactions”). On September 25, 2017 the Rehabilitator filed a motion in the Rehabilitation Court seeking entry of an order approving an amendment to the Segregated Account Rehabilitation Plan (the "Second Amended Plan of Rehabilitation"). Following the conclusion of a Confirmation Hearing on January 22, 2018, the Rehabilitation Court entered an order granting the Rehabilitator's motion and confirming the Second Amended Plan of Rehabilitation. On February 12, 2018 (the "Effective Date"), the Second Amended Plan of Rehabilitation became effective and the Rehabilitation Exit Transactions were consummated. The Rehabilitation Exit Transactions involved a series of transactions which provided holders of beneficial interests in Deferred Amounts (other than Ambac, but including Ambac Assurance) a total effective consideration package, in full satisfaction and discharge of each $1.00 of Deferred Amounts (including accretion), of (i) $0.40 in cash, (ii) $0.41 in principal amount of new Secured Notes (as defined below) and (iii) from certain holders of surplus notes, $0.125 currently outstanding surplus notes. Such consideration package thereby provided a discount of $0.065 (applied first against accretion of Deferred Amounts). Ambac received $0.91 in principal amount of Secured Notes for each $1.00 of Deferred Amounts (including accretion) that it held, and provided a $0.09 discount in full satisfaction and discharge of its Deferred Amount claims. In accordance with the Rehabilitation Exit Support Agreement, the Rehabilitation Exit Transactions also involved a series of interrelated transactions involving the exchange of certain surplus notes (collectively, the “Exchange Offers”), pursuant to which, for each $1.00 of principal amount outstanding and accrued and unpaid interest thereon, holders effectively (i) received $0.40 in cash, (ii) received $0.41 in principal amount of Secured Notes, (iii) retained $0.125 in principal amount and accrued and unpaid interest thereon of surplus notes and (iv) provided a discount of $0.065 in principal amount and accrued and unpaid interest thereon. Ambac did not participate in the Exchange Offers. An aggregate of 99.6% of the surplus notes held by the Supporting Holders and parties other than Ambac and Ambac Assurance participated both in the Rehabilitation Exit Transactions and in the Exchange Offers. As part of the Rehabilitation Exit Transactions, Ambac and Ambac Assurance received consents from holders of surplus notes to a waiver and amendment (the “BSA Waiver and Amendment”) of certain provisions of the Settlement Agreement. The BSA Waiver and Amendment included a waiver of compliance with any and all restrictions, limitations and other provisions set forth in Section 3.04 of the Settlement Agreement that could have directly or indirectly prohibited, restricted or limited in any manner the consummation or effectiveness of the Rehabilitation Exit Transactions regardless of whether such a waiver was actually required in order to consummate or effect such transactions. Among other provisions, the BSA Waiver and Amendment also includes amendments to the Settlement Agreement that eliminate the requirement for Ambac Assurance to have Unaffiliated Qualified Directors on its Board of Directors; eliminate the prohibition on new business; modify the restrictions on the incurrence of indebtedness and other material obligations; modify the restrictions on liens securing permitted indebtedness; modify restrictions applicable to junior surplus notes; and modify restrictions on mergers or similar transactions. After giving effect to the BSA Waiver and Amendment, the Settlement Agreement continues to limit certain activities of Ambac Assurance and its subsidiaries, such as issuing indebtedness; engaging in mergers and similar transactions; disposing of assets; making restricted payments; creating or permitting liens; engaging in transactions with affiliates; modifying or creating tax sharing agreements; and taking certain actions with respect to surplus notes (among other restrictions and limitations). The Settlement Agreement includes certain allowances with respect to these activities and generally requires the approval of OCI and, in some cases, holders of surplus notes issued pursuant to the Settlement Agreement, for consents, waivers or amendments. As contemplated by the Rehabilitation Exit Support Agreement and as a portion of the consideration received by holders of beneficial interests in Deferred Amounts (including Ambac Assurance) in satisfaction and discharge of their claims pursuant to the Second Amended Plan of Rehabilitation and by holders of surplus notes pursuant to the Exchange Offers (as specified above), a newly formed special purpose entity (Ambac LSNI, LLC) issued new secured notes (the “Secured Notes”), secured by all assets of the special purpose entity, which include a note issued by Ambac Assurance to the special purpose entity (the "Ambac Note"), which note is secured by a pledge of Ambac Assurance’s right, | Ambac Financial Group, Inc. 83 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) title and interest in up to the first $1,400,000 of proceeds (net of reinsurance) from certain litigations in which Ambac Assurance seeks redress for breaches of representations and warranties and/or fraud related to residential mortgage-backed securitizations (the “RMBS Litigations”). In addition, the Ambac Note is secured by securities having a market value of approximately $350,000. Ambac Assurance also pledged for the benefit of the holders of Secured Notes (other than Ambac Assurance) the proceeds of the Secured Notes held by Ambac Assurance from time to time, and issued a financial guaranty insurance policy to a trustee for the benefit of holders of Secured Notes irrevocably guarantying all principal and interest payments in respect of the Secured Notes as and when such payments become due and owing. Until the earlier of (i) June 8, 2020 and (ii) the date on which at least 25% of the principal amount of surplus notes (other than junior surplus notes) are no longer outstanding, Ambac has agreed to hold and not sell surplus notes (other than junior surplus notes) which, as of June 30, 2017, have an aggregate of $60,000 of principal amount and accrued and unpaid interest outstanding. In connection with the Rehabilitation Exit Transactions, certain documents and instruments relating to the operation of the Segregated Account or the rights of the Segregated Account and the Rehabilitator were terminated, including the Plan of Operation for the Segregated Account; the Secured Note issued by Ambac Assurance to the Segregated Account; the Aggregate Excess of Loss Reinsurance Agreement between Ambac Assurance, as reinsurer, and the Segregated Account; the Management Services Agreement between Ambac Assurance and the Segregated Account; the Cooperation Agreement among Ambac Assurance, Ambac, the Segregated Account and the Rehabilitator; and the Mediation Agreement dated September 21, 2011 among Ambac, Ambac Assurance, the Segregated Account, the Rehabilitator, OCI and the official committee of unsecured creditors of Ambac. Surplus Note Interest Payment In connection with the consummation of the Rehabilitation Exit Transactions, Ambac Assurance received the approval of the OCI to make a one-time current interest payment of $13,501 on the surplus notes (other than junior surplus notes) outstanding immediately following the Effective Date. On February 12, Ambac Assurance notified the fiscal agent for the surplus notes that the record date for such interest payment would be February 28, 2018 and the payment date would be March 1, 2018. Tier 2 Financing On the Effective Date, Ambac Assurance issued $240,000 of senior notes (the “Tier 2 Notes”) secured by Ambac Assurance’s rights, title and interest in the cash and non-cash proceeds (net of reinsurance) above $1,600,000 received in connection with the RMBS Litigations. Following the consummation of the Rehabilitation Exit Transactions, Ambac Assurance will seek to further improve its financial condition by continuing to pursue asset monetizations; loss recoveries; restructurings, purchases, modifications or exchanges of certain outstanding obligations; extinguishment or modification of certain contractual restrictions; and/or commuting or reducing insured exposures. Separately from or in connection with the actions described above, we may seek to further optimize our capital and corporate structure to unlock shareholder value. Stipulation and Order A Stipulation and Order, the terms of which were agreed between OCI, Ambac and Ambac Assurance, became effective upon the Effective Date (the "Stipulation and Order") and provides as follows: • Ambac Assurance shall maintain a level of surplus and contingency reserves as regards policyholders which provides reasonable security against contingencies affecting its financial position that are not otherwise fully covered by reserves or reinsurance, such that the Commissioner may continue to determine that Ambac Assurance’s surplus and contingency reserves are reasonably in excess of a level that would constitute a financially hazardous condition. • Statutory surplus may not reflect the benefit of any reserve discounting, except to the extent approved by the Commissioner. • Ambac Assurance may not enter any transactions with affiliates, including the payment of a dividend or other distribution, without the approval of the Commissioner, subject to limited exceptions. • Ambac Assurance may not change its business plan or that of Everspan, including but not limited to the writing of new business, unless approved by the Commissioner. • Ambac Assurance must obtain OCI approval with respect to the exercise of certain control rights in connection with policies that had been allocated to the Segregated Account. • Ambac Assurance must obtain OCI approval with respect to any transaction Ambac Assurance proposes to enter into other than in ordinary course of business with non-affiliated counterparties where the aggregate consideration to be paid by Ambac Assurance is equal to or greater than $100,000. • Ambac Assurance must obtain OCI approval for any change to its Investment Policy or Derivative Use Plan. • Ambac Assurance must provide OCI with a monthly report of financial information, the scope of which is to be determined. | Ambac Financial Group, Inc. 84 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) • Ambac Assurance shall provide, and Ambac shall also provide, notice to the Commissioner within ten (10) days of receipt of any communication from any governmental authority, government-sponsored enterprise, or lender to Ambac Assurance, Ambac, or any affiliates which pertains to a circumstance, event or issue which would be reasonably likely to have a material adverse effect on the financial condition or operations of Ambac Assurance and its subsidiaries taken as whole. • Ambac Assurance shall provide notice as soon as practicable of any development in any litigation, including any delay in RMBS litigation, involving Ambac Assurance or any affiliate of Ambac Assurance which would or would be reasonably likely to have a material adverse effect on Ambac Assurance. • Ambac Assurance shall provide notice to the Commissioner of the occurrence, or failure to occur, of any event which would or would be reasonably likely to cause a material adverse effect to the business, assets, properties, operations, or condition, financial or otherwise, or, insofar as can reasonably be foreseen, prospects, financial or otherwise, of Ambac Assurance, an affiliate of Ambac Assurance, or Ambac Assurance and all affiliates taken as a whole. A material adverse effect shall be conclusively presumed if the effect results, or reasonably could result, in a reduction of more than 10% in Ambac Assurance’s surplus as regards policyholders. • Ambac Assurance shall disclose, and Ambac shall disclose, to the Commissioner any instance of fraud or any significant change to the internal control environment incurred by Ambac Assurance, any of its subsidiaries, or Ambac. • If Ambac Assurance proposes to make any changes in the assumptions or vendors utilized in determining statutory loss reserves from the prior year’s statutory loss reserves which would cause the difference (whether positive or negative) between (a) Ambac Assurance’s statutory reserves determined with such proposed changes and (b) Ambac Assurance’s statutory reserves determined without such proposed changes to exceed the lesser of (i) $200,000 or (ii) 10% of Ambac Assurance’s statutory loss reserves without such proposed changes, Ambac Assurance shall notify the Commissioner. • Ambac shall use its best efforts to preserve use of net operating loss carry-forwards for the benefit of Ambac Assurance and its subsidiaries, including but not limited to, refraining from taking any action that would result in, and taking such affirmative steps as are appropriate to avoid, any deconsolidation event. • Ambac shall provide the Commissioner and Ambac Assurance its full cooperation in relation to any issues that Ambac Assurance or its subsidiaries may have relative to the United States Internal Revenue Service, including efforts to obtain a private letter ruling, pre-filing agreement, or other form of guidance or clarification. The Commissioner reserves the right to modify or terminate the Stipulation and Order in a manner consistent with the interests of policyholders, creditors and the public generally, and recognizes that Ambac Assurance may request the Commissioner to do so periodically as conditions warrant. 2. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES Ambac’s consolidated financial statements have been prepared on the basis of U.S. generally accepted accounting principles (“GAAP”). The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses and disclosures of contingent assets and liabilities. Such estimates that are particularly susceptible to change are used in connection with certain fair value measurements, the evaluation of other than temporary impairments on investments, loss reserves for non-derivative insurance policies or valuation allowance on the deferred tax asset, any of which individually could be material. Consolidation: The consolidated financial statements include the accounts of Ambac and all other entities in which Ambac (directly or through its subsidiaries) has a controlling financial interest, including variable interest entities (“VIEs”) for which Ambac or an Ambac subsidiary is deemed the primary beneficiary in accordance with the Consolidation Topic of the Accounting Standards Codification ("ASC"). All significant intercompany balances have been eliminated. The usual condition for a controlling financial interest is ownership of a majority of the voting interests of an entity. However, a controlling financial interest may also exist in entities, such as VIEs, through arrangements that do not involve controlling voting interests. A VIE is an entity: a) that lacks enough equity investment at risk to permit the entity to finance its activities without additional subordinated financial support from other parties; or b) where the group of equity holders does not have: (1) the power, through voting rights or similar rights, to direct the activities of an entity that most significantly impact the entity’s economic performance; (2) the obligation to absorb the entity’s expected losses; or (3) the right to receive the entity’s expected residual returns. The determination of whether a variable interest holder is the primary beneficiary involves performing a qualitative analysis of the VIE that includes, among other factors, its capital structure, contractual terms including the rights of each variable interest holder, the activities of the VIE, whether the variable interest holder has the power to direct the activities of a VIE that most significantly impact the VIE’s economic performance, whether the variable interest holder has the obligation to absorb losses of the VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE, related party relationships and the design of the VIE. An entity that is deemed the primary beneficiary of a VIE is required to consolidate the VIE. Refer to Note 3. Special Purpose Entities, Including Variable Interest Entities, for a | Ambac Financial Group, Inc. 85 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) detailed discussion of Ambac’s involvement in VIEs, Ambac’s methodology for determining whether Ambac is required to consolidate a VIE and the effects of VIEs being consolidated. Ambac Unconsolidated Financial Information: Financial information of Ambac is presented in Schedule II to this Form 10-K as of December 31, 2017 and 2016 and for the years ended December 31, 2017, 2016 and 2015. Investments in subsidiaries are accounted for using the equity method of accounting. Investments: The Investments - Debt and Equity Securities Topic of the ASC requires that all debt instruments and certain equity instruments be classified in Ambac’s Consolidated Balance Sheets according to their purpose and, depending on that classification, be carried at either cost or fair market value. Ambac’s non-VIE investment portfolio is accounted for on a trade-date basis and consists primarily of investments in fixed income securities that are considered available-for-sale as defined by the Investments - Debt and Equity Securities Topic of the ASC. Available- for-sale securities are reported in the financial statements at fair value with unrealized gains and losses, net of deferred taxes, reflected in Accumulated Other Comprehensive Income in Stockholders’ Equity and computed using amortized cost as the basis. For purposes of computing amortized cost, premiums and discounts are accounted for using the effective interest method over the remaining term of the securities. For structured securities with a large underlying pool of homogenous loans, such as mortgage-backed and asset-backed securities, premiums and discounts are adjusted for the effects of actual and anticipated prepayments on a retrospective basis. For other fixed income securities, such as corporate and municipal bonds, premiums and discounts are amortized or accreted over the remaining term of the securities even if they are callable. Ambac’s non-VIE investment portfolio also includes equity interests in pooled investment funds. Such equity interests in the form of common stock or in-substance common stock are classified as trading securities. Equity interests in pooled funds organized as limited liability companies are recorded under the fair value option in accordance with the Financial Instruments Topic of the ASC. Investments classified either as trading or fair value option securities are reported as Other investments on the Consolidated Balance Sheet at fair value with changes in fair value reported through Net investment income on the Statement of Comprehensive Income. Investments in pooled funds have been classified as trading or fair value option securities so that any undistributed earnings of the funds may be reflected in Net investment income as they occur. Fair value is based primarily on quotes obtained from independent market sources. When quotes are not available or cannot be reasonably corroborated, valuation models are used to estimate fair value. These models include estimates, made by management, which utilize current market information. The quotes received or modeled valuations could differ materially from amounts that would actually be realized in the market. Realized gains and losses on the sale of investments are determined on the basis of specific identification. VIE investments in fixed income securities are carried at fair value under the fair value option. For additional information about VIE investments, including fair value by asset-type, see Note 3. Special Purpose Entities, Including Variable Interest Entities. Ambac has a formal impairment review process for fixed income available for sale securities in its investment portfolio. Ambac conducts a review each quarter to identify and evaluate investments that have indications of impairment that may be other than temporary in accordance with the Investments - Debt and Equity Securities Topic of the ASC. Factors considered to identify and assess securities for other than temporary impairment include: (i) fair values that have declined by 20% or more below amortized cost; (ii) market values that have declined by 5% or more but less than 20% below amortized cost for a continuous period of at least six months; (iii) recent downgrades by rating agencies; (iv) the financial condition of the issuer and financial guarantor, as applicable, and an analysis of projected defaults on the underlying collateral; (v) scheduled interest payments are past due; (vi) whether Ambac has the intent to sell the security; and (vii) whether it is more likely than not that Ambac will be required to sell a security before the anticipated recovery of its amortized cost basis. If we believe a decline in the fair value of a particular investment is temporary, we record the decline as an unrealized loss net of tax in Accumulated Other Comprehensive Income in Stockholders’ Equity on our Consolidated Balance Sheets. If management either: (i) has the intent to sell its investment in a debt security or (ii) determines that the Company more likely than not will be required to sell the debt security before its anticipated recovery of the amortized cost basis less any current period credit impairment, then an other-than-temporary impairment charge is recognized in earnings, with the amortized cost of the security being written-down to fair value. If these conditions are not met, but it is determined that a credit loss exists, the credit impairment loss is recognized in earnings, and the other-than-temporary amount related to all other factors is recognized in other comprehensive income. For fixed income securities that have other-than-temporary impairments in a period, the previous amortized cost of the security less the amount of the other-than-temporary impairment recorded through earnings becomes the investment’s new cost basis. Ambac accretes the new cost basis to par or to the estimated future cash flows to be recovered over the expected remaining life of the security. The evaluation of securities for impairment is a quantitative and qualitative process, which is subject to risks and uncertainties and is intended to determine whether, and to what extent, declines in the fair value of investments should be recognized in current period earnings. The risks and uncertainties include changes in general economic conditions, the issuer’s or guarantor’s financial condition and/or future prospects, the impact of regulatory actions on the investment portfolio, the performance of the underlying collateral, the effects of changes in interest rates or credit spreads and the expected recovery period. With respect to Ambac insured securities owned, future cash flows used to measure credit impairment represents the sum of (i) the bond’s intrinsic cash flows and (ii) the estimated Ambac Assurance claim payments. For Ambac- insured securities owned and guaranteed under policies that were allocated to the Segregated Account, the estimate of Ambac Assurance claim payments included interest on Deferred Amounts, which were discharged on February 12, 2018. Ambac estimated the timing of claim payment | Ambac Financial Group, Inc. 86 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) receipts on all Ambac-insured securities owned, but the actual timing of such amounts for Segregated Account securities was at the sole discretion of the Rehabilitator. Refer to Note 1. Background and Business Description for more information on the Segregated Account and the Segregated Account Rehabilitation Proceedings. Ambac’s assessment about whether a decline in value is other-than-temporary reflects management’s current judgment regarding facts and circumstances specific to a security and the factors noted above, including Ambac's intention to sell securities and ability to hold temporarily impaired securities until recovery. If that judgment changes, Ambac may ultimately record a charge for other-than-temporary impairment in future periods. Net Premiums: Gross premiums are received either upfront or in installments. For premiums received upfront, an unearned premium revenue (“UPR”) liability is established, which is initially recorded as the cash amount received. For installment premium transactions, a premium receivable asset and offsetting UPR liability is initially established in an amount equal to: (i) the present value of future contractual premiums due (the “contractual” method) or (ii) if the underlying insured obligation is a homogenous pool of assets which are contractually prepayable, the present value of premiums to be collected over the expected life of the transaction (the “expected” method). An appropriate risk-free rate corresponding to the weighted average life of each policy and currency is used to discount the future premiums contractually due or expected to be collected. For example, U.S. dollar exposures are discounted using U.S. Treasury rates while exposures denominated in a foreign currency are discounted using the appropriate risk-free rate for the respective currency. The weighted average risk-free rate at December 31, 2017 and 2016, was 2.5%. and 2.6%, respectively, and the weighted average period of future premiums used to estimate the premium receivable at December 31, 2017 and 2016, was 9.8 years and 9.0 years, respectively. Insured obligations consisting of homogeneous pools for which Ambac uses expected future premiums to estimate the premium receivable and UPR include residential mortgage-backed securities. As prepayment assumptions change for homogenous pool transactions, or if there is an actual prepayment for a “contractual” method installment transaction, the related premium receivable and UPR are adjusted in equal and offsetting amounts with no immediate effect on earnings using new premium cash flows and the then current risk-free rate corresponding to the initial weighted average life of the related policy. For both upfront and installment premium policies, premium revenues are earned over the life of the financial guarantee contract in proportion to the insured principal amount outstanding at each reporting date (referred to as the level-yield method). For installment paying policies, the premium receivable discount, equating to the difference between the undiscounted future installment premiums and the present value of future installment premiums, is accreted as premiums earned in proportion to the premium receivable balance at each reporting date. Similar to gross premiums, premiums ceded to reinsurers are paid either upfront or in installments. For premiums paid upfront, a deferred ceded premium asset is established which is initially recorded as the cash amount paid. For installment premiums, a ceded installment premiums payable liability and offsetting deferred ceded premium asset are initially established in an amount equal to: i) the present value of future contractual premiums due or ii) if the underlying insured obligation is a homogenous pool of assets which are contractually pre-payable, the present value of expected premiums to be paid over the life of the transaction. An appropriate risk-free rate corresponding to the weighted average life of each policy and exposure currency is used to discount the future premiums contractually due or expected to be collected. Premiums ceded to reinsurers reduce the amount of premiums earned by Ambac from its financial guarantee insurance policies. For both upfront and installment premiums, ceded premiums written are primarily recognized in earnings in proportion to and at the same time as the related gross premium revenue is recognized. For premiums paid to reinsurers on an installment basis, Ambac records the present value of future ceding commissions as an offset to ceded premiums payable, using the same assumptions noted above for installment premiums. When a bond issue insured by Ambac has been retired early, typically due to an issuer call, any remaining UPR is recognized at that time to the extent the financial guarantee contract is legally extinguished, causing accelerated premium revenue. For installment premium paying transactions, we offset the recognition of any remaining UPR by the reduction of the related premium receivable to zero (as it will not be collected as a result of the retirement), which may cause negative accelerated premium revenue. Certain obligations insured by Ambac have been legally defeased whereby government securities are purchased by the issuer with the proceeds of a new bond issuance, or less frequently with other funds of the issuer, and held in escrow. The principal and interest received from the escrowed securities are then used to retire the Ambac-insured obligations at a future date either to their maturity date (a refunding) or a specified call date (a pre-refunding). Ambac has evaluated the provisions in policies issued on these obligations and determined those insurance policies have not been legally extinguished. For policies with refunding securities, premium revenue recognition is not impacted as the escrowed maturity date is the same as the previous legal maturity date. For policies with pre-refunding securities, the maturity date of the pre-refunded security has been shortened from its previous legal maturity. Although premium revenue recognition has not been accelerated in the period of the pre-refunding, it results in an increase in the rate at which the policy's remaining UPR is to be recognized. Loans: Loans are reported at either their outstanding principal balance less unamortized discount or at fair value. For loans reported at their outstanding principal balance less unamortized discount (non-VIE loans), interest income is earned using the effective interest method based upon interest accrued on the unpaid principal balance adjusted for accretion of discounts. A loan is considered impaired when, based on the financial condition of the borrower, it is probable that Ambac will be unable to collect all principal and interest due according to the contractual terms of the loan agreement. Loans held by VIEs consolidated as required under the Consolidation Topic of the ASC are carried at fair value, with changes in fair value recorded in Income (loss) on variable interest entities on the Consolidated Statements of Total Comprehensive Income. | Ambac Financial Group, Inc. 87 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Derivative Contracts: The Company has entered into derivative contracts both for trading purposes and to hedge certain economic risks inherent in its financial asset and liability portfolios. None of Ambac’s derivative contracts are designated as hedges under the Derivatives and Hedging Topic of the ASC. Ambac's derivatives consist primarily of credit derivatives, interest rate swaps and futures contracts. Ambac’s credit derivative contracts are accounted for at fair value since they do not qualify for the financial guarantee scope exception under the Derivatives and Hedging Topic of the ASC. Changes in fair value of credit derivatives are recorded in Net change in fair value of credit derivatives on the Consolidated Statements of Total Comprehensive Income. Ambac maintains a derivatives portfolio consisting primarily of interest rate swaps and futures contracts to economically hedge interest rate risk in the financial guarantee and investment portfolios. This portfolio also includes legacy interest rate swaps with asset-backed securitization issuers, states, municipalities and their authorities which were written in connection with their financings. Changes in fair value of all interest rate derivatives are recorded in net gains (losses) on interest rate derivatives on the Consolidated Statements of Total Comprehensive Income. VIEs consolidated under the Consolidation Topic of the ASC entered into derivative contracts to meet specified purposes within their securitization structure. Changes in fair value of consolidated VIE derivatives are included within Income (loss) on variable interest entities on the Consolidated Statements of Total Comprehensive Income. All derivatives are recorded on the Consolidated Balance Sheets at fair value on a gross basis; assets and liabilities are netted by counterparty only when a legal right of offset exists. Ambac has determined that the amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral may not be used to offset amounts due under the derivative instruments in the normal course of settlement. Therefore, such amounts are not offset against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. Effective January 3, 2017, as a result of rule changes by the central clearing party ("CCP"), variation payments are considered settlements of the associated derivative balance and are reflected as a reduction to derivative liabilities on the Consolidated Balance Sheet at December 31, 2017. For periods presented prior to this rule change, variation payments were included in "Other assets" on the Consolidated Balance Sheet. Refer to Note 11. Derivative Instruments for further discussion of the Company’s use of derivative instruments and their impact of the consolidated financial statements, including details of the CCP rule change. Refer to Note 9. Fair Value Measurements for further description of the methodologies used to determine the fair value of derivative contracts, including model inputs and assumptions where applicable. Goodwill: Under the Reorganization Topic of the ASC, the Company determined that fresh start financial statement reporting was to be applied upon our emergence from Chapter 11 because (i) the reorganization value of the emerging entity was less than total post-petition liabilities and allowed claims, and (ii) the holders of existing voting shares immediately before the confirmation of the Reorganization Plan received less than 50% of the voting shares of the emerging entity. Specifically, fresh start reporting was applied upon confirmation of the Reorganization Plan by the Bankruptcy Court and the satisfaction of the remaining material contingencies necessary to complete implementation of the Reorganization Plan. All conditions required for the adoption of fresh start reporting were satisfied by the Company on April 30, 2013 (“Fresh Start Reporting Date”) when Ambac executed a closing agreement with the United States Internal Revenue Service (the "IRS") to conclude the settlement of a dispute. As such, fresh start financial statement reporting ("Fresh Start") was adopted by the Company on April 30, 2013, incorporating, among other things, the discharge of debt obligations, issuance of new common stock and fair value adjustments. At the Fresh Start Reporting Date, we revalued our assets and liabilities to current estimated fair value. The excess reorganization value which could not be attributed to the fair value of specific identified tangible and intangible assets ("fair value of net assets") was recorded as goodwill. Pursuant to the Intangibles - Goodwill and Other Topic of the ASC, goodwill is not amortized but is subject to annual impairment testing. We tested goodwill for impairment as of October 1st of each year. Goodwill is also tested more frequently if indicators of impairment exist for each reporting unit. During the third quarter of 2015, Ambac determined sufficient indicators of potential impairment existed to perform an interim goodwill impairment evaluation for the reporting unit to which goodwill was assigned. Those indicators included the trading values of Ambac stock and changes in Ambac credit spreads. In conducting the goodwill impairment analysis, we performed step one of the goodwill impairment test where we estimated the fair value of the reporting unit using a market approach, which was derived using: i) Ambac’s common stock and warrant market capitalization, ii) fair value estimates of Ambac Assurance preferred shares (reported as noncontrolling interests on Ambac's balance sheet) and iii) an estimated control premium. Step one of the impairment test indicated the reporting unit's carrying value exceeded its fair value. Accordingly, the Company performed step two of the impairment test, which indicated the implied fair value of goodwill was zero. This was the result of substantial decreases in the reporting unit's fair value and substantial increases in the fair value of its net assets. The fair value of the reporting unit decreased significantly due to a material decrease in Ambac's market capitalization components (described above). The reporting unit's fair value of net assets increased significantly primarily as a result of a decrease in the estimated fair value of financial guarantee liabilities and, to a lesser extent, a decrease in the fair value of long-term debt. The fair value decrease in financial guarantee liabilities, which is a Level 3 estimate, was primarily driven by wider Ambac credit spreads and positive loss and loss expense reserves development. Please refer to Note 9. Fair Value Measurements for further discussion on the fair value model for financial guarantee liabilities. The fair value decrease in long-term debt was driven by lower market pricing on surplus notes and junior surplus notes. As a result, the Company recorded a full non-cash, non-tax deductible goodwill impairment charge of $514,511 in 2015. | Ambac Financial Group, Inc. 88 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Insurance Intangible Asset: At the Fresh Start Reporting Date, an insurance intangible asset was recorded which represented the difference between the fair value and aggregate carrying value of the financial guarantee insurance and reinsurance assets and liabilities. The carrying values of our financial guarantee insurance and reinsurance contracts continue to be reported and measured in accordance with existing accounting policies. Pursuant to the Financial Services-Insurance Topic of the ASC, the insurance intangible is to be measured on a basis consistent with the related financial guarantee insurance and reinsurance contracts. The insurance intangible asset is amortized using a level yield method based on par exposure of the related financial guarantee insurance or reinsurance contracts and is applied to groups of contracts with similar characteristics. Restricted Cash: Cash that we do not have the right to use for general purposes is recorded as restricted cash in our consolidated balance sheets. Restricted cash includes consolidated variable interest entity cash restricted to fund the obligations of the consolidated VIEs. Loss and Loss Expenses: The loss and loss expense reserve (“loss reserve”) policy relates only to Ambac’s non-derivative insurance business for insurance policies issued to beneficiaries, including VIEs, for which we do not consolidate the VIE. Losses and loss expenses are based upon estimates of the ultimate aggregate losses inherent in the non-derivative financial guarantee portfolio as of the reporting date. The policy for derivative contracts is discussed in the “Derivative Contracts” section above. A loss reserve is recorded on the balance sheet on a policy-by-policy basis. Loss reserve components of an insurance policy include unpaid claims and the present value ("PV") of expected net cash flows required to be paid under an insurance contract, further described below: • Unpaid claims represent the sum of (i) claims not yet paid for policies allocated to the Segregated Account, including Deferred Amounts (as defined in Note 1. Background and Business Description) and (ii) accrued interest on Deferred Amounts (generally at an effective rate of 5.1%.) as required by the Segregated Account Rehabilitation Plan. Refer to Note 1. Background and Business Description for further discussion of the Segregated Account Rehabilitation Plan. Unpaid claims are measured based on the cost of settling the claims, which is principal plus accrued interest. • The PV of expected net cash flows represents the PV of expected cash outflows less the PV of expected cash inflows. The PV of expected net cash flows are impacted by: (i) expected future claims to be paid under an insurance contract, including the impact of potential settlement outcomes upon future installment premiums, (ii) expected recoveries from contractual breaches of RMBS representations and warranties by transaction sponsors, which is discussed further in the “RMBS Representation and Warranty Subrogation Recoveries” section below, (iii) excess spread within the underlying transaction's cash flow structure, and (iv) other subrogation recoveries, including expected receipts from third parties within the underlying transaction's cash flow structure. Ambac’s approach to resolving disputes involving contractual breaches by transaction sponsors or other third parties has included negotiations and/or pursuing litigation. Ambac does not include potential recoveries attributed solely to fraudulent inducement claims in our estimate of subrogation recoveries, since any remedies under such claims would be non-contractual. Net cash outflow policies represent contracts where the sum of unpaid claims plus the PV of expected cash outflows are greater than the PV of expected cash inflows. For such policies, a “Loss and loss expense reserves” liability is recorded for the sum of: (i) unpaid claims plus (ii) the excess of the PV of expected net cash outflows over the unearned premium revenue. Net cash inflow policies represent contracts where losses have been paid, but not yet recovered, such that the PV of expected cash inflows are greater than the sum of unpaid claims plus the PV of expected cash outflows. For such policies, a “Subrogation recoverable” asset is recorded for the difference between (i) the PV of expected net cash inflows and (ii) unpaid claims. The approaches used to estimate expected future losses and recoveries considers the likelihood of all possible outcomes. The evaluation process for determining expected losses is subject to certain judgments based on our assumptions regarding the probability of default by the issuer of the insured security, probability of settlement outcomes (which may include commutation settlements, refinancing and/or other settlement outcomes) and expected severity of credits for each insurance contract. Ambac’s loss reserves are based on management’s ongoing review of the financial guarantee credit portfolio. Active surveillance of the insured portfolio enables Ambac’s Risk Management Group ("RMG") to track credit migration of insured obligations from period to period and update internal classifications and credit ratings for each transaction. Non-adversely classified credits are assigned a Class I rating while adversely classified credits are assigned a rating of Class IA through Class V. The criteria for an exposure to be assigned an adversely classified credit rating includes the deterioration of an issuer’s financial condition, underperformance of the underlying collateral (for collateral dependent transactions such as mortgage-backed or student loan securitizations), poor performance by the servicer of the underlying collateral and other adverse economic events or trends. The servicer of the underlying collateral of an insured securitization transaction is a consideration in assessing credit quality because the servicer’s performance can directly impact the performance of the related issue. For example, a servicer of a mortgage-backed securitization that does not remain current in its collection loss mitigation efforts could cause an increase in the delinquency and potential default of the underlying obligation. Similarly, loss severities increase when a servicer does not effectively handle loss mitigation activities such as (i) the advancing of delinquent principal and interest and of default related expenses which are deemed to be recoverable by the servicer, (ii) pursuit of loan charge-offs which maximize cash flows from the mortgage loan pool, and (iii) foreclosure and real estate owned disposition strategies and timelines. All credits are assigned risk classifications by RMG using the following guidelines: | Ambac Financial Group, Inc. 89 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) CLASS I - “Fully Performing - Meets Ambac Criteria with Remote Probability of Claim” - Credits that demonstrate adequate security and structural protection with a strong capacity to pay interest, repay principal and perform as underwritten. Factors supporting debt service payment and performance are considered unlikely to change and any such change would not have a negative impact upon the fundamental credit quality. Through ongoing surveillance, Ambac may also designate Class I credits into one or more of the following categories: • Survey list - credits that may lack information or demonstrate a weakness but further deterioration is not expected. • Watch list - credits that demonstrate the potential for future material adverse development due to such factors as long-term uncertainty about a particular sector, a certain structural element related to the issuer or transaction or overall financial and economic sustainability. CLASS IA - “Potential Problem with Risks to be Dimensioned” - Credits that are fully current and monetary default or claims-payment are not anticipated. The payor’s or issuer’s financial condition may be deteriorating or the credits may lack adequate collateral. A structured financing may also evidence weakness in its fundamental credit quality as evidenced by its under-performance relative to its modeled projections at underwriting, issues related to the servicer’s ability to perform or questions about the structural integrity of the transaction. While certain of these credits may still retain an investment grade rating, they usually have experienced or are vulnerable to a ratings downgrade. Further investigation is required to dimension and correct any deficiencies. A complete legal review of documents may be required. An action plan should be developed with triggers for future classification changes upward or downward. CLASS II - “Substandard Requiring Intervention” - Credits whose fundamental credit quality has deteriorated to the point that timely payment of debt service may be jeopardized by adversely developing trends of a financial, economic, structural, managerial or political nature. No claim payment is currently foreseen but the probability of loss or claim payment over the life of the transaction is now existent (generally 10% or greater probability). Class II credits may be border-line or below investment grade (BBB- to B). Prompt and sustained action must be taken to execute a comprehensive loss mitigation plan and correct deficiencies. CLASS III - “Doubtful with Clear Potential for Loss” - Credits whose fundamental credit quality has deteriorated to the point that timely payment of debt service has been or will be jeopardized by adverse trends of a financial, economic, structural, managerial or political nature which, in the absence of positive change or corrective action, are likely to result in a loss. The probability of monetary default or claims paying over the life of the transaction is generally 50% or greater. Full exercise of all available remedial actions is required to avert or minimize losses. Class III credits will generally be rated below investment grade (B to CCC). CLASS IV - “Imminent Default or Defaulted” - Monetary default or claim payments have occurred or are expected imminently. Class IV credits are generally rated D. CLASS V - “Fully Reserved” - The credit has defaulted and payments have occurred. The claim payments are scheduled and known, reserves have been established to fully cover such claims, and no claim volatility is expected. The population of credits evaluated in Ambac’s loss reserve process are: (i) all adversely classified credits (Class IA through V) and ii) non- adversely classified credits which had an internal Ambac rating downgrade since the transaction’s inception. One of two approaches is then utilized to estimate losses to ultimately determine if a loss reserve should be established. The first approach is a statistical expected loss approach, which considers the likelihood of all possible outcomes. The “base case” statistical expected loss is the product of: (i) the par outstanding on the credit; (ii) internally developed historical default information (taking into consideration internal ratings and average life of an obligation); (iii) internally developed loss severities; and (iv) a discount factor. The loss severities and default information are based on rating agency information, are specific to each bond type and are established and approved by senior RMG officers. For certain credit exposures, Ambac’s additional monitoring, loss remediation efforts and probabilities of potential settlement outcomes may provide information relevant to adjust this estimate of “base case” statistical expected losses. Analysts may accept the “base case” statistical expected loss as the best estimate of expected loss or assign multiple probability weighted scenarios to determine an adjusted statistical expected loss that better reflects management’s view of a given transaction’s expected losses, as well as the potential for additional remediation activities (i.e., commutations). The second approach entails the use of cash-flow based models to estimate expected losses (future claims, net of potential recoveries, expected to be paid to the holder of the insured financial obligation). Ambac’s RMG group will consider the likelihood of all possible outcomes and develop appropriate cash flow scenarios. This approach can include the utilization of internal or third party models to project future losses and resultant claim payment estimates. We utilize cash flow models for residential mortgage-backed (RMBS), student loan, and other exposures. RMBS and student loan models use historical performance of the collateral pools in order to then derive future performance characteristics, such as default and voluntary prepayment rates, which in turn determine projected future claim payments. In other cases, such as many public finance exposures, including our Puerto Rico exposures, we do not specifically forecast resources available to pay debt service in the cash flow model itself. Rather, we consider the issuers’ overall ability and willingness to pay, including the fiscal, economic, legal and political framework. In this approach a probability-weighted expected loss estimate is developed based on assigning probabilities to multiple claim payment scenarios and applying an appropriate discount factor. Additionally, we assign a probability to the issuer’s ability to refinance an insured issue and/or Ambac’s ability to execute a potential settlement (i.e., commutation) of the insurance policy, including the impact on future installment premiums. The commutation scenarios and the related probabilities of occurrence vary by transaction, depending on our view of the likelihood of negotiating such a transaction with issuers and/or investors. | Ambac Financial Group, Inc. 90 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) The discount factor applied to the statistical expected loss approach is based on a risk-free discount rate corresponding to the remaining expected weighted-average life of the exposure and the exposure currency. For the cash flow scenario approach, discount factors are applied based on a risk-free discount rate term structure and correspond to the date of each respective cash flow payment or recovery and the exposure currency. Discount factors are updated for the current risk-free rate each reporting period. Ambac establishes loss expense reserves based on our estimate of expected net cash outflows for loss expenses, such as legal and consulting costs. RMBS Representation and Warranty Subrogation Recoveries: Ambac records as a component of its loss reserve estimate, subrogation recoveries related to securitized loans in RMBS transactions that breached certain representations and warranties described herein. Generally, the sponsor of a RMBS transaction provided representations and warranties with respect to the securitized loans, including representations and warranties with respect to loan characteristics, the absence of borrower fraud in the underlying loan pools and other misconduct in the origination process and attesting to the compliance of loans with the prevailing underwriting policies. In such cases, the sponsor of the transaction is contractually obligated to repurchase, cure or substitute collateral for any loan that breaches the representations or warranties. Ambac or its counsel have engaged consultants with significant mortgage underwriting experience to review the underwriting documentation for mortgage loans underlying certain insured RMBS transactions which exhibited exceptionally poor performance. Factors which Ambac believes to be indicative of poor performance include (i) increased levels of early payment defaults, (ii) significant numbers of loan liquidations or charge-offs and resulting high levels of losses, and (iii) rapid elimination of credit protections inherent in the transactions’ structures. With respect to item (ii), “loan liquidations” refers to loans for which the servicer has liquidated the related collateral and the securitization has realized losses on the loan; “charge-offs” refers to loans which have been written off as uncollectible by the servicer, generating no recoveries to the securitization, and may also refer to the unrecovered balance of liquidated loans. In either case, the servicer has taken actions to recover against the collateral, and the securitization has incurred losses to the extent such actions did not result in full repayment of the borrower’s obligations. Generally, subsequent to the forensic exercise of examining loan files to ascertain whether the loans conformed to the representations and warranties, we submit nonconforming loans for repurchase to the contractual counterparty bearing the repurchase obligation, which is typically the transaction sponsor. To effect a repurchase, depending on the transaction, the sponsor is obligated to repurchase the loan at (a) for loans which have not been liquidated or charged off, either (i) the current unpaid principal balance of the loan, (ii) the current unpaid principal balance plus accrued unpaid interest, or (iii) the current unpaid principal balance plus accrued interest plus unreimbursed servicer advances/ expenses and/or trustee expenses resulting from the breach of representations and warranties that trigger the repurchase, and (b) for a loan that has already been liquidated or charged-off, the amount of the realized loss (which in certain cases may exclude accrued unpaid interest). In cases where loans are repurchased by a sponsor, the effect is typically to offset current period losses and then to increase the over- collateralization of the securitization, depending on the extent of loan repurchases and the structure of the securitization. Specifically, the repurchase price is paid by the sponsor to the securitization trust which holds the loan. The cash becomes an asset of the trust, replacing the loan that was repurchased by the sponsor. On a monthly basis the cash received related to loan repurchases by the sponsor is aggregated with cash collections from the underlying mortgages and applied in accordance with the trust indenture payment waterfall. This payment waterfall typically includes principal and interest payments to the note holders, various expenses of the trust and reimbursements to Ambac, as financial guarantor, for previously paid claims. Notwithstanding the reimbursement of previous claim payments, to the extent there continues to be insufficient cash in the waterfall in the current month to make scheduled principal and interest payments to the note holders, Ambac is required to make additional claim payments to cover this shortfall. Ambac may also receive payments directly from transaction sponsors in settlement of their repurchase obligations pursuant to negotiated settlement agreements or otherwise as a result of related litigation. While the obligation by sponsors to repurchase loans with material breaches is clear, generally the sponsors have not yet honored those obligations without actual or threatened litigation. Ambac has utilized the results of the above described loan file examinations to make demands for loan repurchases from sponsors or their successors and, in certain instances, as a part of the basis for litigation. Ambac’s approach to resolving these disputes has included negotiating with individual sponsors at the transaction level and in some cases at the individual loan level and has resulted in the repurchase of some loans. Ambac has initiated and will continue to pursue lawsuits seeking compliance with the repurchase obligations in the securitization documents. Ambac has performed the above-mentioned, detailed examinations on a variety of second-lien and first-lien transactions that have experienced exceptionally poor performance. However, the loan file examinations and related estimated recoveries we have reviewed and recorded to date have been limited to only those transactions whose sponsors (or their successors) are subsidiaries of large financial institutions, all of which carry an investment grade rating from at least one nationally recognized rating agency, or are otherwise deemed to have the financial wherewithal to live up to their repurchase obligations. While our contractual recourse is generally to the sponsor/subsidiary, rather than to the parent, each of these large institutions has significant financial resources and may have an ongoing interest in mortgage finance, and we therefore believe that the financial institution/parent would ultimately assume financial responsibility for these obligations if the sponsor/subsidiary is unable to honor its contractual obligations or pay a judgment that we may obtain in litigation. Additionally, in the case of successor institutions, we are not aware of any provisions that explicitly preclude or limit the successors’ ability to honor the obligations of the original sponsor. Certain successor financial institutions have made significant payments to certain claimants to settle breaches of representations and warranties perpetrated by sponsors that have been acquired by such financial institutions. In addition, Ambac received a significant payment in 2016 | Ambac Financial Group, Inc. 91 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) from JP Morgan to settle RMBS-related litigation. As a result of these factors, we did not make significant adjustments to our estimated subrogation recoveries with respect to the credit risk of these sponsors or their successors. Our ability to recover the RMBS subrogation recoveries is subject to significant uncertainty, including risks inherent in litigation, collectability of such amounts from counterparties and/or their respective parents and affiliates, timing of receipt of any such recoveries, intervention by OCI which could impede our ability to take actions required to realize such recoveries and uncertainties inherent in the assumptions used in estimating such recoveries. The approach used to estimate subrogation recoveries is based on obtaining a random sample of the original loans in the pool, using a protocol developed by a statistical expert. The ratio of: (a) loans identified in the sample as having materially breached representations and warranties to (b) the total loan sample size, is applied (extrapolated) to the sum of realized and estimated future collateral pool losses to determine an estimated repurchase obligation. We limit the estimated repurchase obligation by ever-to-date incurred losses, with respect to the remaining steps in this approach. Multiple probability-weighted scenarios are developed by applying various realization factors to the estimated repurchase obligation. The realization factors in these scenarios were developed using Ambac’s own assumptions about the likelihood of outcomes based on all the information available to it including, but not limited to, (i) discussions with external legal counsel and their views on ultimate settlement and/ or litigation outcomes, (ii) experience with loan put back negotiations where the existence of a material breach was debated and negotiated at the loan level, (iii) the pervasiveness of the breach rates and (iv) experience in settling similar claims. The probability weightings are developed based on the unique facts and circumstances for each transaction. The sum of these probability-weighted scenarios represents the undiscounted subrogation recovery, which is then discounted using a factor derived from a risk-free discount rate term structure that corresponds to the date of each respective recovery. Discount factors are updated for the current risk-free rate each reporting period. Obligations under Investment Agreements: Ambac's investment agreements were written principally to asset-backed and structured finance issuers, states, municipalities and municipal authorities, and required Ambac to pay an agreed-upon rate of interest based on funds deposited. Proceeds from these investment agreement obligations were used to invest in fixed income investments. Interest income from these investments was included in Net investment income on the Consolidated Statements of Total Comprehensive Income. The principal amount outstanding under investment agreements of $82,358, with a variable interest rate of 0.94%, at December 31, 2016 was repaid during the first quarter of 2017. Obligations under investment agreements are reported as liabilities on the Consolidated Balance Sheets at their principal value less unamortized discount. The carrying value of these obligations is adjusted for principal paid and interest credited to the account. Interest expense is computed based upon daily outstanding liability balances at rates and periods specified in the agreements adjusted for accretion of discount, and is included in Interest expense on the Consolidated Statements of Total Comprehensive Income. Long-Term Debt: Long-term debt issued by Ambac is carried at par value less unamortized discount. Accrued interest and discount accretion on long-term debt is reported as Interest expense on the Consolidated Statements of Total Comprehensive Income. To the extent Ambac repurchases or redeems its long-term debt, such repurchases or redemptions may be settled for an amount different than the carrying value of the obligation. Any difference between the settlement payment and carrying value of the obligation is reported in Net realized gains (losses) on extinguishment of debt on the Consolidated Statements of Total Comprehensive Income. Long-term debt issued by VIEs consolidated as a result of Ambac's variable interest arising from financial guarantees written by Ambac's subsidiaries, is carried at fair value with changes in fair value recorded as Income (loss) on variable interest entities on the Consolidated Statements of Total Comprehensive Income. Noncontrolling Interest: At December 31, 2016 and 2017, Ambac Assurance had 26,411 shares of issued and outstanding auction rate preferred shares with a liquidation preference of $660,300 (reported as noncontrolling interest of $264,110 on Ambac's balance sheet). The auction occurs every 28 days. Due to the dislocation in the auction rate markets and the Company’s financial condition, the dividend rate on the auction market preferred has continuously been reset at the maximum rate of one-month LIBOR plus 200 basis points. Under the terms of the preferred stock, dividends may not be paid on the common stock of Ambac Assurance unless all accrued and unpaid dividends on the preferred stock for the then current dividend period have been paid, provided, that dividends on the common stock may be made at all times for the purpose of, and only in such amounts as are necessary for, enabling Ambac (i) to service its indebtedness for borrowed money as such payments become due or (ii) to pay its operating expenses. If dividends are paid on the common stock as provided in the prior sentence, dividends on the preferred stock become cumulative until the date that all accumulated and unpaid dividends have been paid on the preferred stock. Ambac Assurance has not paid dividends on its preferred stock since 2010. | Ambac Financial Group, Inc. 92 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Employee Benefits: Postretirement and Postemployment Benefits: Ambac provides postretirement and postemployment benefits, including health and life benefits covering employees who meet certain age and service requirements. Ambac accounts for these benefits under the accrual method of accounting. Amounts related to the postretirement health benefits liability are established and charged to expense based on actuarial determinations. Incentive Compensation: Incentive compensation is a key component of our compensation strategy. Our incentive compensation awards generally have two components: short term incentive compensation (consisting of an annual cash bonus and deferred stock units for certain officers) and long term incentive plan awards (consisting of cash awards and performance stock units). Annual decisions with regard to incentive compensation are generally made in the first quarter of each year and are based on Company performance and individual and business unit performance of the prior year. The Ambac 2013 Incentive Compensation Plan (the “Equity Plan”) provides for the granting of stock options, restricted stock, stock appreciation rights, restricted and performance units and other awards that are valued or determined by reference to Ambac's common stock to employees and directors. In March 2014, Ambac developed a long term incentive compensation plan (“LTIP”) as a sub-plan of the 2013 Plan. This LTIP allows for both cash and equity performance awards to US employees. In 2015, Ambac UK 's Board of Directors adopted a long term incentive plan which provides cash based performance awards to Ambac UK employees. Prior to the adoption of ASU 2016-09 (as noted below), Ambac recognized compensation costs for all equity classified awards granted at fair value with an estimation of forfeitures for all unvested shares. As a result of the adoption of ASU 2016-09 in 2017, Ambac recognizes compensation costs for all equity classified awards granted at fair value and records forfeitures for unvested shares only when they occur. • Deferred stock units granted vest upon grant and will settle and convert to Ambac common stock annually over a two-year period (50% on the first anniversary of the grant date and 50% on the second anniversary of the grant date). The fair value of these grants is recognized as compensation expense on the date of grant since no future service is required. • Restricted stock units granted only require future service and accordingly the respective fair value is amortized into compensation expense over the relevant service period. • Performance stock units granted and performance cash awards require both future service and achieving specified performance targets to vest and accordingly compensation costs are only recognized when the achievement of the performance conditions are considered probable. Once deemed probable, such compensation costs are amortized over the relevant service period. Compensation costs are initially based on the probable outcome of the performance conditions and adjusted for subsequent changes in the estimated or actual outcome each reporting period as necessary. Changes in the estimated or actual outcome of a performance condition are recognized by reflecting a retrospective adjustment to compensation cost in the current period. Depreciation and Amortization: Depreciation of furniture and fixtures and electronic data processing equipment is charged over the estimated useful lives of the respective assets, ranging from three to five years, using the straight-line method. Amortization of leasehold improvements is charged over the remaining term of the respective operating lease using the straight-line method. Foreign Currency: Financial statement accounts expressed in foreign currencies are translated into U.S. dollars in accordance with the Foreign Currency Matters Topic of the ASC. The functional currencies of Ambac's subsidiaries are the local currencies of the country where the respective subsidiaries are based, which are also the primary operating environments in which the subsidiaries operate. Foreign currency translation: Functional currency assets and liabilities of Ambac’s foreign subsidiaries are translated into U.S. dollars using exchange rates in effect at the balance sheet dates and the related translation adjustments, net of deferred taxes, are included as a component of Accumulated Other Comprehensive Income in Stockholders' Equity. Consolidated Statements of Total Comprehensive Income (Loss) accounts expressed in functional currencies are translated using average exchange rates. Foreign currency transactions: The impact of non-functional currency transactions and the remeasurement of non-functional currency assets and liabilities into the respective subsidiaries' functional currency (collectively "foreign currency transactions gains/(losses)") are $21,116, $(39,128) and $(17,010) for the years ended December 31, 2017, 2016 and 2015, respectively. Foreign currency transactions gains/(losses) are primarily the result of remeasuring Ambac UK's assets and liabilities denominated in currencies other than its functional currency, primarily the U.S. dollar and the Euro. The significant components of foreign currency transaction gains/(losses), including the respective classifications in the Consolidated Statement of Total Comprehensive Income, are as follows: • Remeasurement of loss reserves, classified in Loss and loss expenses, in the amount of $28,939, $(77,578) and $(24,838) for the years ended December 31, 2017, 2016 and 2015, respectively; | Ambac Financial Group, Inc. 93 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) • Realized gain (loss) from the sale of investment securities and the unrealized gains (losses) of trading and short-term investment securities, classified in Net realized investment gains, in the amount of $(4,769), $30,179 and $5,816 for the years ended December 31, 2017, 2016 and 2015, respectively; • Remeasurement of premium receivables, classified in Other income, in the amount of $(1,904), $8,003 and $(2,555) for the years ended December 31, 2017, 2016 and 2015, respectively; and • Remeasurement of credit derivative liabilities, classified in Net change in fair value of credit derivative, in the amount of $(1,150), $32 and $3,981 for the years ended December 31, 2017, 2016 and 2015, respectively. Income Taxes: Ambac files a consolidated U.S. Federal income tax return with its subsidiaries. Ambac UK files tax returns in both the United Kingdom and Italy (for its Milan branch). Current tax assets and liabilities are recognized for taxes refundable or payable for the current year. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on current and deferred tax assets and liabilities of a change in tax rates is recognized in the period that includes the enactment date. In December 2017, the Tax Cut and Jobs Act ("TCJA") was enacted that introduces significant changes that impact U.S. corporate tax rates, business-related exclusions, and deductions and credits effective January 1, 2018. As such, we incorporated the effects of the TCJA in our current and deferred tax evaluation for the year ended December 31, 2017. Ambac evaluates our deferred income taxes quarterly to determine if valuation allowances are required. The Income Taxes Topic of the ASC requires that companies assess whether valuation allowances should be established against their deferred tax assets based on the consideration of all available evidence using a ‘more likely than not” standard. In making such judgments, significant weight is given to evidence that can be objectively verified. The level of deferred tax asset recognition is influenced by management’s assessment of future profitability, which depends on the existence of sufficient taxable income of the appropriate character (ordinary vs. capital) within the carry forward periods available under the tax law. We determined that we would not be able to realize all of our deferred tax assets in the future, and therefore we reduced such amounts through a charge to the Statement of Total Comprehensive Income in the period in which that determination was made. Refer to Note 14. Income Taxes for further discussion of the Company's tax positions, including the impact of the TCJA. The Income Taxes Topic of the ASC provides a framework to determine the appropriate level of tax reserves for uncertain tax positions. This framework prescribes a more-likely-than-not threshold for financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. Ambac also accrues interest and penalties related to these unrecognized tax benefits in the provision for income taxes. Net Income Per Share: Basic net income per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding and vested restricted stock units. Diluted net income per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares used for basic earnings per share plus all potential dilutive common shares outstanding during the period. All potential dilutive common shares outstanding consider common stock deliverable pursuant to warrants issued under the Reorganization Plan, vested and unvested options, unvested restricted stock units and unvested performance stock units granted under employee and director compensation plans. Supplemental Disclosure of Cash Flow Information: (Dollars in thousands) Year Ended December 31, 2017 2016 2015 Cash paid during the period for: Income taxes Interest on long-term debt and investment agreements Non-cash financing activities: $ 40,334 $ 39,112 21,437 $ 4,537 16,969 1,847 Decrease in long-term debt as a result of an exchange for investment securities 55,426 — — Reclassifications: Reclassifications may have been made to prior years' amounts to conform to the current year's presentation. | Ambac Financial Group, Inc. 94 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Recently Adopted Accounting Standards: Effective December 31, 2017, Ambac early adopted the following accounting standard: Reclassification of Shareholders' Equity items related to the TCJA In February 2018, the FASB issued ASU 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. Current GAAP requires the effect of a change in tax laws or rates which impact deferred tax assets and liabilities to be recorded as income tax expense within net income. This guidance is applicable even in situations where the related income tax effects of items in accumulated other comprehensive income ("AOCI") were originally charged or credited directly to AOCI as required by GAAP. As a result, when tax laws or rates change, the tax effects of certain items (referred to as "stranded tax effects") in AOCI may not reflect the appropriate tax rate. This ASU eliminates the stranded tax effects by allowing a reclassification of those items from AOCI to retained earnings that resulted from the recently enacted TCJA. Ambac early adopted this standard effective December 31, 2017. Adoption of this ASU resulted in a decrease to AOCI of $6,588 and offsetting increase to retained earnings of $6,588 with no change to total shareholders' equity. Effective January 1, 2017, Ambac adopted the following accounting standards: Consolidation of Variable Interest Entities - Decision Makers In October 2016, the FASB issued ASU 2016-17, Consolidation (Topic 810) - Interests Held through Related Parties That Are under Common Control. The new guidance changes how a reporting entity that is a single decision maker for a VIE will consider its indirect interests in that VIE when determining whether the reporting entity is the primary beneficiary and should consolidate the VIE. Under previous GAAP, a single decision maker in a VIE is required to consider an indirect interest held by a related party under common control in its entirety. Under the new ASU, the single decision maker will consider the indirect interest on a proportionate basis. Adoption of this ASU did not have an impact on Ambac's financial statements. Improvements to Employee Share-Based Payment Accounting In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718) - Improvements to Employee Share-Based Payment Accounting. The objective of this ASU is to improve and simplify the accounting for employee share-based payment accounting. The amendments are as follows: (i) recognizing excess tax benefits and tax deficiencies as income tax expense, (ii) recognizing excess tax benefits regardless of whether it reduces taxes payable in the current period, (iii) classifying excess tax benefits related to share-based payments along with other income tax cash flows as an operating activity on the statement of cash flows, (iv) for purposes of accruing compensation costs, allowing companies to make an accounting policy election to either: a) estimate forfeitures or b) account for forfeitures as they occur, which Ambac elected to do upon adoption, (v) to qualify for equity classification treatment, permitting tax withholding by employees up to the maximum statutory tax rate and (vi) classifying cash paid by an employer to a taxing authority when directly withholding shares as a financing activity on the statement of cash flows. Adoption of this ASU did not have a material impact on Ambac's financial statements. Equity Method of Accounting In March 2016, the FASB issued ASU 2016-07, Investments-Equity Method and Joint Ventures (Topic 323) - Simplifying the Transition to the Equity Method of Accounting. This ASU eliminates the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively as if the equity method had been in effect during all previous periods that the investment had been owned. The ASU will now require that at the date an available-for-sale equity security becomes qualified for the equity method of accounting, the reporting entity will recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income. Adoption of this ASU did not have an impact on Ambac's financial statements. Contingent Put and Call Options in Debt Instruments In March 2016, the FASB issued ASU 2016-06, Derivatives and Hedging (Topic 815) - Contingent Put and Call Options in Debt Instruments. Previous accounting rules required that embedded derivatives be separated from the host contract in a financial instrument and accounted for separately as derivatives if certain criteria are met. One of these criteria is that the economic characteristics and risks of the embedded derivatives are not "clearly and closely related" to the host contract. The objective of the ASU is to resolve diversity in practice in assessing embedded contingent put and call options. The ASU clarifies what steps are required when assessing whether the economic characteristics and risk of put and call options are clearly and closely related to their debt host contracts. Adoption of this ASU did not have an impact on Ambac's financial statements. Future Application of Accounting Standards: Equity-linked instruments with down round features In July 2017, the FASB issued ASU 2017-11, Earnings Per Share (Topic 260) and Derivatives and Hedging (Topic 815) - Accounting for Certain Financial Instruments with Down Round Features. Equity-linked instruments, such as warrants and convertible instruments may contain down round features that result in the strike price being reduced on the basis of the pricing of future equity offerings. Under the ASU, | Ambac Financial Group, Inc. 95 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) a down round feature will no longer require a freestanding equity-linked instrument (or embedded conversion option) to be classified as a liability that is remeasured at fair value through the income statement (i.e. marked-to-market). However, other features of the equity-linked instrument (or embedded conversion option) must still be evaluated to determine whether liability or equity classification is appropriate. Equity classified instruments are not marked-to-market. For earnings per share ("EPS") reporting, the ASU requires companies to recognize the effect of the down round feature only when it is triggered by treating it as a dividend and as a reduction of income available to common shareholders in basic EPS. The amendments in this ASU are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in any interim period. Ambac will adopt this ASU on January 1, 2019. The adoption of this ASU is not expected to have a consequential impact on Ambac's financial statements. Stock Compensation--Scope of Modification Accounting In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718) - Scope of Modification Accounting. The ASU provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. Entities will apply the modification accounting guidance if the value, vesting conditions or classification of the award changes. The current disclosure requirements in Topic 718 apply regardless of whether an entity is required to apply modification accounting under the amendments in this ASU. The amendments in this ASU are effective for all entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim period for which financial statements have not yet been issued. Ambac will adopt this ASU on January 1, 2018. The adoption of this ASU is not expected to have a consequential impact on Ambac's financial statements. Premium Amortization on Callable Debt Securities In March 2017, the FASB issued ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20) - Premium Amortization on Purchased Callable Debt Securities. The ASU shortens the amortization period for the premium on callable debt securities to the earliest call date. Under current GAAP, a reporting entity generally amortizes the premium as yield adjustment over the contractual life (i.e. maturity) of the debt security and if that debt security is called, the entity would record a loss equal to the unamortized premium. The ASU does not change the accounting for callable debt securities held at a discount, which will continue to be amortized to maturity. ASU 2017-08 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with early adoption permitted. The ASU must be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Ambac will adopt this ASU on January 1, 2019 and we are evaluating its impact on Ambac's financial statements. Net Periodic Pension and Postretirement Costs In March 2017, the FASB issued ASU 2017-07, Compensation-Retirement Benefits (Topic 715) - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. The objective of the ASU is to increase transparency in the reporting of net pension cost and net postretirement cost (collectively "net benefit cost"). The ASU requires that the service cost component of net benefit cost be reported on the same line item as other compensation costs arising from services rendered by employees. It further requires that the other components of net benefit costs (i.e. interest costs, amortization of prior service cost, etc.) be presented separately from the service cost component and outside the subtotal of income from operations, if one is presented. ASU 2017-09 is effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, with early adoption permitted. Ambac will adopt this ASU on January 1, 2018. The adoption of this ASU is not expected to have a consequential impact on Ambac's financial statements. Restricted Cash In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230) - Restricted Cash. Current GAAP does not include specific guidance on the cash flow classification and presentation of changes in restricted cash and restricted cash flow equivalents other than limited guidance for non-for-profit entities. This ASU is intended to resolve diversity in practice in the classification of changes in restricted cash and restricted cash flow equivalents on the statement of cash flows. The new guidance requires that restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning and ending period amounts on the statement of cash flows, along with certain disclosures. ASU 2016-18 is effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. Amendments in the ASU should be applied retrospectively to all periods presented. Ambac will adopt this ASU on January 1, 2018. The adoption of this ASU is not expected to have a consequential impact on Ambac's financial statements. | Ambac Financial Group, Inc. 96 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Income Taxes In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740) - Intra-Entity Transfers of Assets Other Than Inventory. Current GAAP prohibits the recognition of current and deferred income taxes for intercompany transfers of assets until the asset has been sold to an outside party. The ASU will require companies to recognize the income tax effects of intercompany sales and transfers of assets other than inventory, as income tax expense (or benefit) in the period in which the transfer occurs. ASU 2016-16 is effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. Early adoption is permitted as of the beginning of an annual reporting period for which financial statements (interim or annual) have not been issued. Ambac will adopt this ASU on January 1, 2018 and we are evaluating its impact on Ambac's financial statements. Classification of Certain Cash Receipts and Cash Payments In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230) - Classification of Certain Cash Receipts and Cash Payments. The ASU resolves diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. Transactions addressed in the ASU that may impact Ambac are as follows: • Debt prepayment or debt extinguishment costs - Such payments will be classified as a financing cash outflow. • Settlement of zero-coupon debt or other debt with coupon rates that are insignificant in relation to the effective interest rate of the borrowing - The portion of the cash payment attributable to accreted interest will be classified as an operating cash outflow and the portion attributable to the principal will be classified as a financing cash outflow. • Distributions from equity-method investees - An entity will elect one of the two following approaches. Under the "cumulative earnings approach": i) distributions received up to the amount of cumulative earnings recognized will be treated as returns on investments and classified as cash inflows from operating activities and ii) distributions received in excess of earnings recognized will be treated as returns of investments and classified as cash inflows from investing activities. Under the "nature of the distribution" approach, distributions received will be classified based on the nature of the activity that generated the distribution (i.e. classified as a return on investment or return of investment), when such information is available to the investor. • Beneficial interests in securitization transactions - Any beneficial interests obtained in financial assets transferred to an unconsolidated securitization entity will be disclosed as a non-cash investing activity. Subsequent cash receipts from the beneficial interests in previously transferred trade receivables will be classified as cash inflows from investing activities. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. Early adoption is permitted, including adoptions within an interim period. Ambac will adopt this ASU on January 1, 2018. Adoption of this ASU is not expected to have a consequential impact on Ambac's financial statements. Measurement of Credit Losses on Financial Instruments In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments. This ASU significantly affects how reporting entities will measure credit losses for financial assets that are not accounted for at fair value through net income, which include loans, debt securities, trade receivables, net investments in leases, and certain off-balance sheet credit exposures. For financial assets measured at amortized cost, the ASU replaces the "incurred loss" model, which generally delayed recognition of the full amount of credit losses until the loss was probable of occurring, with an "expected loss" model, which reflects an entity's current estimate of all expected credit losses. Expected credit losses for amortized cost assets will be recorded as a valuation allowance, with subsequent increases or decreases in the allowance reflected in the income statement each period. For available-for-sale debt securities, credit losses under the ASU will be measured similarly to current GAAP. However, under the ASU, credit losses for available-for-sale securities will be recorded as a valuation allowance (similar to the amortized cost assets approach described above), rather than as a direct write-down of the security as is required under current GAAP. As a result, improvements to estimated credit losses for available-for-sale debt securities will be recognized immediately in the income statement rather than as interest income over time. The ASU is effective for annual periods beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted as of the fiscal year beginning after December 15, 2018. Ambac has not determined whether it will early adopt this ASU and we are currently evaluating its impact on Ambac's financial statements. The significant implementation matters to be addressed include identifying the inventory of financial assets that will be affected by this standard, identifying new data requirements and data sources for implementing the expected loss model for those instruments not already using this model and identifying and documenting accounting process changes, including related controls. Leases In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The main difference between current U.S. GAAP and this ASU is the recognition of lease assets and lease liabilities for those leases classified as operating leases. For operating leases, a lessee is required to: 1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the balance sheet, 2) recognize a single lease cost, calculated so that the cost is allocated over the lease term generally on a straight-line basis and 3) classify all cash payment within operating activities in the statement of cash flows. The ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The transition guidance requires lessees to recognize and measure leases at the beginning of the | Ambac Financial Group, Inc. 97 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) earliest period presented using a modified retrospective approach which include a number of optional practical expedients. We will adopt ASU 2015-02 on January 1, 2019. We are evaluating the impact of this ASU, including the transitional practical expedients, on Ambac's financial statements. We believe Ambac's office leases will be the most significantly impacted by this ASU. The significant implementation matters to be addressed include identifying the remaining inventory of leases (i.e. equipment and other) that will be affected by this standard and identifying and documenting accounting process changes, including related controls. Recognition and Measurement of Financial Assets and Liabilities In January 2016, the FASB issued ASC 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities. The ASU makes the following targeted changes for financial assets and liabilities: i) requiring equity investments with readily determinable fair values to be measured at fair value with changes recognized in net income; ii) simplifying the impairment assessment of equity securities without readily determinable fair values using a qualitative approach; iii) eliminating disclosure of the method and significant assumptions used to fair value instruments measured at amortized cost on the balance sheet; iv) requiring use of the exit price notion when measuring the fair value of instruments for disclosure purposes; v) for financial liabilities where the fair value option has been elected, requiring the portion of the fair value change related to instrument-specific credit risk (which includes a Company's own credit risk) to be separately reported in other comprehensive income; vi) requiring the separate presentation of financial assets and liabilities by measurement category and form of financial asset (liability) on the balance sheet or accompanying notes; and vii) clarifying that the evaluation of a valuation allowance on a deferred tax asset related to available-for-sale securities should be performed in combination with the entity's other deferred tax assets. The ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those years Early adoption of item (v) above is permitted for financial statements (both annual and interim periods) that have not yet been issued. Ambac will adopt all provisions of this ASU on January 1, 2018. Ambac has elected the fair value option for all VIE financial assets and financial liabilities with net fair value changes reported in Income (loss) on variable interest entities in the Consolidated Statements of Total Comprehensive Income. Upon implementation of ASU 2016-01, the credit component of fair value changes in VIE liabilities will be reported in Accumulated other comprehensive income. We are still evaluating the transition adjustment impact of the ASU, which will be a reclassification between Retained earnings and Accumulated other comprehensive income, with no net change to Total stockholders' equity. Subsequent to adoption, because the credit component of fair value changes in VIE liabilities will be reported in other comprehensive income, we will likely have greater volatility in net income (specifically the Income (loss) on variable interest entities line item). Revenue recognition In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) that amends the accounting guidance for recognizing revenue for contracts with customers to transfer goods and contracts for the transfer of non-financial assets unless those contracts are within the scope of other accounting standards. ASU 2015-14 deferred the effective date of ASU 2014-09 to annual periods beginning after December 15, 2017, including interim periods within that reporting period. Ambac will adopt this ASU on January 1, 2018. This ASU does not apply to insurance contracts and most financial instruments and therefore did not have an impact on Ambac's financial statements. 3. SPECIAL PURPOSE ENTITIES, INCLUDING VARIABLE INTEREST ENTITIES Ambac, with its subsidiaries, has engaged in transactions with special purpose entities, including VIEs, in various capacities. • Ambac most commonly provides financial guarantees, including credit derivative contracts, for various debt obligations issued by special purpose entities, including VIEs ("FG VIEs"). • Ambac sponsors special purpose entities that issued notes to fund the purchase of certain financial assets. • Ambac monetized its ownership of the junior surplus note issued to it by the Segregated Account by depositing the junior surplus note into a newly formed VIE trust in exchange for cash and an owner trust certificate, which represents Ambac's right to residual cash flows from the junior surplus note. • Ambac is an investor in collateralized debt obligations, mortgage-backed and other asset-backed securities issued by VIEs and its ownership interest is generally insignificant to the VIE and/or Ambac does not have rights that direct the activities that are most significant to such VIE. FG VIEs: Ambac’s subsidiaries provide financial guarantees in respect of assets held or debt obligations of special purpose entities, including VIEs. Ambac’s primary variable interest exists through this financial guarantee insurance or credit derivative contract. The transaction structures provide certain financial protection to Ambac. This financial protection can take several forms; however, the most common are over- collateralization, first loss and excess spread. In the case of over-collateralization (i.e., the principal amount of the securitized assets exceeds the principal amount of the debt obligations guaranteed), the structure allows the transaction to experience defaults among the securitized assets before a default is experienced on the debt obligations that have been guaranteed by Ambac’s subsidiaries. In the case of first loss, the financial guarantee insurance policy or credit derivative contract only covers a senior layer of losses on assets held or debt issued by special | Ambac Financial Group, Inc. 98 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) purpose entities, including VIEs. The first loss with respect to the assets is either retained by the asset seller or sold off in the form of equity or mezzanine debt to other investors. In the case of excess spread, the securitized assets contributed to special purpose entities, including VIEs, generate interest cash flows that are in excess of the interest payments on the related debt; such excess cash flow is applied to redeem debt, thus creating over-collateralization. Generally, upon deterioration in the performance of a transaction or upon an event of default as specified in the transaction legal documents, Ambac will obtain certain loss remediation rights. These rights may enable Ambac to direct the activities of the entity that most significantly impact the entity’s economic performance. We determined that Ambac’s subsidiaries generally have the obligation to absorb a FG VIE's expected losses given that they have issued financial guarantees supporting the liabilities (and in certain cases assets). As further described below, we consolidated certain FG VIEs because: (i) we determined for certain transactions that experienced the aforementioned performance deterioration, that Ambac’s subsidiaries had the power, through voting rights or similar rights, to direct the activities that most significantly impact the VIE’s economic performance because certain triggers had been breached in these transactions resulting in Ambac's subsidiaries' ability to exercise certain loss remediation activities, or (ii) due to the passive nature of the VIEs’ activities, Ambac’s subsidiaries’ contingent loss remediation rights upon a breach of certain triggers in the future is considered to be the power to direct the activities that most significantly impact the VIEs’ economic performance. With respect to existing VIEs involving Ambac financial guarantees, Ambac is generally required to consolidate a VIE in the period that applicable triggers result in Ambac having control over the VIE’s most significant economic activities. As further discussed in Note 1. Background and Business Description, the OCI requires Ambac Assurance to obtain its approval with respect to the exercise of certain control rights in connection with policies that had been allocated to the Segregated Account. Accordingly management expects the number of additional VIEs that may be consolidated as a result of the Segregated Account's exit from rehabilitation will be reduced and possibly eliminated. A VIE is deconsolidated in the period that Ambac no longer has such control, which could occur in connection with the execution of remediation activities on the transaction or amortization of insured exposure, any of which may reduce the degree of Ambac’s control over a VIE. Assets and liabilities of FG VIEs that are consolidated are reported within Variable interest entity assets or Variable interest entity liabilities on the Consolidated Balance Sheets. The net results from such FG VIEs are reported within Income (loss) on variable interest entities in the Consolidated Statements of Total Comprehensive Income (Loss). Upon initial consolidation of a FG VIE, we recognize a gain or loss in earnings for the difference between: (i) the fair value of the consideration paid, the fair value of any non-controlling interests and the reported amount of any previously held interests and (ii) the net amount, as measured on a fair value basis, of the assets and liabilities consolidated. Upon deconsolidation of a FG VIE, we recognize a gain or loss for the difference between: (i) the fair value of any consideration received, the fair value of any retained non-controlling investment in the VIE and the carrying amount of any non-controlling interest in the VIE and (ii) the carrying amount of the VIE’s assets and liabilities. Gains or losses from consolidation and deconsolidation that are reported in earnings are reported within Income (loss) on variable interest entities on the Consolidated Statements of Total Comprehensive Income (Loss). The impact of consolidating such FG VIEs on Ambac’s balance sheet is the elimination of transactions between the consolidated FG VIEs and Ambac’s operating subsidiaries and the inclusion of the FG VIE’s third party assets and liabilities. For a financial guarantee insurance policy issued to a consolidated VIE, Ambac does not reflect the financial guarantee insurance policy in accordance with the related insurance accounting rules under the Financial Services – Insurance Topic of the ASC. Consequently, upon consolidation, Ambac eliminates the insurance assets and liabilities associated with the policy from the Consolidated Balance Sheets. Such insurance assets and liabilities may include premium receivables, reinsurance recoverable, deferred ceded premium, subrogation recoverable, unearned premiums, loss and loss expense reserves, ceded premiums payable and insurance intangible assets. For investment securities owned by Ambac that are debt instruments issued by the VIE, the investment securities balance is eliminated upon consolidation. As of December 31, 2017 consolidated FG VIE assets and liabilities relating to 11 consolidated entities were $14,500,507 and $14,366,434, respectively. As of December 31, 2016, consolidated FG VIE assets and liabilities relating to 12 consolidated entities were $13,367,834 and $13,235,425, respectively. As of December 31, 2017, eight and three consolidated FG VIEs related to transaction insured by Ambac UK and Ambac Assurance and eight and four as of December 31, 2016. As of December 31, 2017 FG VIE assets and liabilities of $14,160,152 and $14,026,704 and as of December 31, 2016, FG VIE assets and liabilities of $12,950,009 and $12,833,466 related to transactions guaranteed by Ambac UK. The remaining balance of consolidated FG VIE assets and liabilities are related to transactions guaranteed by Ambac Assurance. Ambac is not primarily liable for, and generally does not guarantee all of the debt obligations issued by the VIEs. Ambac would only be required to make payments on the VIE debt obligations in the event that the issuer of such debt obligations defaults on any principal or interest due and such obligation is guaranteed by Ambac. Additionally, Ambac’s general creditors, other than those specific policy holders which own the VIE debt obligations, do not have rights with regard to the assets of the VIEs. Ambac evaluates the net income effects and earnings per share effects to determine attributions between Ambac and non-controlling interests as a result of consolidating a VIE. Ambac has determined that the net income and earnings per share effect of these consolidated FG VIEs are attributable to Ambac’s interests through financial guarantee premium and loss payments with the VIE. Below is a schedule detailing the change in fair value of the various financial instruments within the consolidated FG VIEs, along with gains (losses) from consolidating and deconsolidating FG VIEs, that together comprise Income (loss) on variable interest entities for for the affected periods: | Ambac Financial Group, Inc. 99 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Year Ended December 31, Income (loss) on changes related to: Net fair value of VIE assets and liabilities Deconsolidation Income (loss) on Variable Interest Entities 2017 2016 2015 $ $ 19,670 — 19,670 $ $ (14,093) $ — (14,093) $ 30,997 572 31,569 Ambac deconsolidated one, one and two VIEs for the years ended December 31, 2017, 2016 and 2015, respectively. These VIEs were deconsolidated as a result of guaranteed bond retirements or financial guarantee policy terminations that eliminated Ambac's controlling interest in the entities. The deconsolidations occurring in 2017 and 2016 were related to guaranteed bond retirements which resulted in no gain or loss. The gain on deconsolidation in 2015 reflected the excess of fees receivable from a financial guarantee policy termination for one VIE, representing Ambac's remaining non-controlling financial interest, over the fair value of net assets of the VIE at deconsolidation. The table below provides the fair value of fixed income securities, by asset-type, held by consolidated VIEs as of December 31, 2017 and 2016: December 31, Investments: Corporate obligations Total variable interest entity assets: fixed income securities 2017 2016 $ $ 2,914,145 2,914,145 $ $ 2,622,566 2,622,566 The following table provides supplemental information about the loans held as assets and long-term debt associated with the VIEs for which the fair value option has been elected as of December 31, 2017 and 2016: December 31, 2017: Loans Long-term debt December 31, 2016: Loans Long-term debt Ambac Sponsored VIEs: Estimated fair value Unpaid principal balance $ 11,529,384 $ 12,160,544 10,658,963 $ 11,155,936 $ 8,168,651 9,387,884 7,641,756 8,854,530 A subsidiary of Ambac transferred financial assets to a special purpose entity. The business purpose of this entity was to provide certain financial guarantee clients with funding for their debt obligations. This special purpose entity was established as a separate legal entity, demonstrably distinct from Ambac and that Ambac, its affiliates or its agents could not unilaterally dissolve. The permitted activities of this entity are contractually limited to purchasing assets from Ambac, issuing medium-term notes ("MTNs") to fund such purchases, executing derivative hedges and obtaining financial guarantee policies with respect to indebtedness incurred. Ambac does not consolidate this entity because Ambac Assurance’s policies issued to it were allocated to the Segregated Account, thereby limiting Ambac’s control over the entity's most significant economic activities. Pursuant to the Stipulation and Order (described in Note 1. Background and Business Description), Ambac's exercise of certain control rights with respect to former Segregated Account policies will continue to be subject to approval by OCI. Ambac has elected to account for its equity interest in this entity at fair value under the fair value option in accordance with the Financial Instruments Topic of the ASC. We believe that the fair value of the investments in this entity provides for greater transparency for recording profit or loss as compared to the equity method under the Investments – Equity Method and Joint Ventures Topic of the ASC. Refer to Note 9. Fair Value Measurements for further information on the valuation technique and inputs used to measure the fair value of Ambac’s equity interest in this entity. At December 31, 2017 and 2016 the fair value of this entity was $5,979 and $7,382, respectively, and is reported within Other assets on the Consolidated Balance Sheets. • Total principal amount of debt outstanding was $420,600 and $388,950 at December 31, 2017 and 2016, respectively. In each case, Ambac sold assets to this entity. The assets are composed of utility obligations with a weighted average rating of BBB+ at December 31, 2017 and weighted average life of 3.1 years. The purchase by this entity of financial assets was financed through the issuance of MTNs, which are cross-collateralized by the purchased assets. The MTNs have the same expected weighted average life as the purchased assets. Derivative contracts (interest rate swaps) are used within the entity for economic hedging purposes only. Derivative positions were established at the time MTNs were issued to purchase financial assets. As of December 31, 2017, all fixed-income securities owned, MTNs outstanding and payments due under derivative contracts were guaranteed under financial guarantee insurance policies issued by Ambac Assurance or Ambac UK. | Ambac Financial Group, Inc. 100 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) • Insurance premiums paid to Ambac Assurance and Ambac UK by this entity are earned in a manner consistent with other insurance policies, over the risk period. Additionally, any losses incurred on such insurance policies are included in Ambac’s Consolidated Statements of Total Comprehensive Income (Loss). Under the terms of an Administrative Agency Agreement, Ambac provides certain administrative duties, primarily collecting amounts due on the obligations and making interest payments on the MTNs. In July 2015, Ambac Assurance entered into a secured borrowing transaction whereby it sold 17 Ambac insured residential mortgage-backed securities (the "Securities") and all rights associated therewith as of May 31, 2015, to a Delaware statutory trust (the "Trust") in exchange for an equity certificate in the Trust, all financial guarantee claim payments associated with the Securities and cash of $146,000 (prior to expenses associated with the transaction). Although the Securities were legally sold to the Trust, the Securities will remain in fixed income securities on the Consolidated Balance Sheets. The Securities had par and fair value of $293,409 and $346,212 as of December 31, 2017, respectively. Refer to Note 10. Investments for further discussion of the restrictions on the invested assets. At the same time, a second Delaware statutory trust (the "Issuer"), issued $146,000 of debt securities and used the proceeds, together with an equity certificate of the Issuer, to purchase from the Trust a certificate secured by and entitling the Issuer to all principal and interest payments (other than financial guarantee claim payments) on the Securities. Interest on the debt securities is payable monthly at an annual rate of one month LIBOR + 2.8%. Both the Trust and the Issuer are consolidated VIEs because Ambac Assurance was involved in their design and holds a significant amount of the beneficial interests issued by the VIEs or guaranteed the assets held by the VIEs. VIE debt outstanding to third parties under this secured borrowing transaction had a carrying value of $73,993 and $102,403 as of December 31, 2017 and 2016, respectively, and is reported in Long-Term Debt on the Consolidated Balance Sheets. Variable Interests in Non-Consolidated VIEs On August 28, 2014, Ambac monetized its ownership of the junior surplus note issued to it by the Segregated Account by depositing the junior surplus note into a newly formed VIE trust in exchange for cash and an owner trust certificate, which represents Ambac's right to residual cash flows from the junior surplus notes. Ambac does not consolidate the VIE. Ambac reports its interest in the VIE as an equity investment within Other investments on the Consolidated Balance Sheets with associated results from operations included within Net investment income: Other investments on the Consolidated Statements of Total Comprehensive Income (Loss). The equity investment had a carrying value of $34,941 and $30,003 as of December 31, 2017 and 2016, respectively. Additionally, at December 31, 2017 Ambac held $35,000 of the debt issued by this VIE. | Ambac Financial Group, Inc. 101 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) The following table displays the carrying amount of the assets, liabilities and maximum exposure to loss of Ambac’s variable interests in non- consolidated VIEs resulting from financial guarantee and derivative contracts by major underlying asset classes, as of December 31, 2017 and 2016: Carrying Value of Assets and Liabilities Maximum Exposure To Loss (1) Insurance Assets (2) Insurance Liabilities (3) Net Derivative Assets (Liabilities) (4) December 31, 2017: Global structured finance: Collateralized debt obligations Mortgage-backed—residential Other consumer asset-backed Other commercial asset-backed Other Total global structured finance Global public finance Total December 31, 2016: Global structured finance: Collateralized debt obligations Mortgage-backed—residential Other consumer asset-backed Other commercial asset-backed Other Total global structured finance Global public finance Total $ 35,555 $ 169 $ 1 $ 12,766,685 2,266,610 987,797 2,513,304 18,569,951 25,629,816 619,848 23,405 30,413 60,086 733,921 335,347 3,218,356 328,732 35,976 306,457 3,889,522 371,056 44,199,767 $ 1,069,268 $ 4,260,578 $ (15) — — — 10,311 10,296 (551) 9,745 761,451 $ 218 $ 3,319 $ (145,402) 14,859,909 2,391,604 1,686,256 2,963,521 22,662,741 25,608,471 725,106 26,758 66,277 66,091 884,450 338,587 3,118,892 302,335 64,961 412,929 3,902,436 359,142 $ 48,271,212 $ 1,223,037 $ 4,261,578 $ — — — 13,347 (132,055) (8,827) (140,882) $ $ (1) Maximum exposure to loss represents the maximum future payments of principal and interest on insured obligations and derivative contracts plus Deferred Amounts and accrued and unpaid interest thereon. Ambac’s maximum exposure to loss does not include the benefit of any financial instruments (such as reinsurance or hedge contracts) that Ambac may utilize to mitigate the risks associated with these variable interests. (2) (3) Insurance assets represent the amount recorded in “Premium receivables” and “Subrogation recoverable” for financial guarantee contracts on Ambac’s Consolidated Balance Sheets. Insurance liabilities represent the amount recorded in “Loss and loss expense reserves” and “Unearned premiums” for financial guarantee contracts on Ambac’s Consolidated Balance Sheets. (4) Net derivative assets (liabilities) represent the fair value recognized on credit derivative contracts and interest rate swaps on Ambac’s Consolidated Balance Sheets. | Ambac Financial Group, Inc. 102 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) 4. COMPREHENSIVE INCOME The following tables detail the changes in the balances of each component of accumulated other comprehensive income for the affected periods: Unrealized Gains (Losses) on Available- for Sale Securities (1) Amortization of Postretirement Benefit (1) Gain (Loss) on Foreign Currency Translation (1) Total Year Ended December 31, 2017: Beginning Balance Other comprehensive income before reclassifications Amounts reclassified from accumulated other comprehensive income Adjustment to initially adopt ASU 2018-02 Net current period other comprehensive income Balance at December 31, 2017 Year ended December 31, 2016: Beginning Balance Other comprehensive income before reclassifications Amounts reclassified from accumulated other comprehensive income Net current period other comprehensive income (loss) Balance at December 31, 2016 $ $ $ $ 9,367 $ 2,625 (167,220) $ 73,586 118,863 $ (96,325) 14,805 (6,588) (88,108) (1,352) — 1,273 30,755 $ 10,640 $ 50,963 $ 85,378 (17,478) 67,900 9,344 $ 1,041 (1,018) 23 — — 73,586 (93,634) $ (45,092) $ (122,128) — (122,128) (38,990) (20,114) 13,453 (6,588) (13,249) (52,239) 15,215 (35,709) (18,496) (54,205) (38,990) 118,863 $ 9,367 $ (167,220) $ (1) All amounts are net of tax and noncontrolling interest. Amounts in parentheses indicate debits. The following table details the significant amounts reclassified from each component of accumulated other comprehensive income for the affected periods: Details about Accumulated Other Comprehensive Income Components Unrealized Gains (Losses) on Available-for-Sale Securities Amortization of Postretirement Benefit Prior service cost Actuarial gains (losses) Total reclassifications for the period Amount Reclassified from Accumulated Other Comprehensive Income (1) Year Ended December 31, 2017 2016 Affected Line Item in the Consolidated Statement of Total Comprehensive Income $ $ $ $ 14,805 — 14,805 $ $ (963) $ (389) (1,352) — (1,352) 13,453 $ (17,478) Net realized investment gains — Tax (expense) benefit (17,478) Net of tax and noncontrolling interest (3) (666) Underwriting and operating expenses (2) (352) Underwriting and operating expenses (2) (1,018) Total before tax — Tax (expense) benefit (1,018) Net of tax and noncontrolling interest (3) (18,496) Net of tax and noncontrolling interest (3) (1) Amounts in parentheses indicate debits to the Consolidated Statement of Comprehensive Income. (2) These accumulated other comprehensive income components are included in the computation of net periodic benefit cost. (3) Amount agrees with amount reported as reclassifications from AOCI in the disclosure about changes in AOCI balances. | Ambac Financial Group, Inc. 103 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) 5. NET INCOME PER SHARE On May 1, 2013, pursuant to the Second Modified Fifth Amended Plan of Reorganization of Ambac (the "Reorganization Plan"), 45,000,000 shares of new common stock at par value of $0.01 per share and 5,047,138 warrants were issued. Warrants entitled such holders to acquire up to 5,047,138 shares of new common stock at an exercise price of $16.67 per share at any time on or prior to April 30, 2023. For the years ended December 31, 2017, 2016 and 2015, 0, 136, and 740, warrants, respectively, were exercised, resulting in an issuance of 0, 136 and 236 shares of common stock. On June 30, 2015, the Board of Directors of Ambac authorized the establishment of a warrant repurchase program that permits the repurchase of up to $10,000 of warrants. On November 3, 2016, the Board of Directors of Ambac authorized a $10,000 increase to the warrant repurchase program. For the year ended December 31, 2017, Ambac repurchased 0 warrants at a cost of $0. As of December 31, 2017, Ambac had repurchased 985,331 warrants at a cost of $8,092, (average cost of $8.21 per warrant), leaving 4,053,670 warrants outstanding. The remaining aggregate authorization at December 31, 2017 is $11,939. The following table provides a reconciliation of the common shares used for basic net income per share to the diluted shares used for diluted net income per share: Year Ended December 31, Basic weighted average shares outstanding Effect of potential dilutive shares(1): Warrants Stock options Restricted stock units Performance stock units 2017 2016 2015 45,367,932 45,212,414 45,173,542 — — — — 312,619 447 116,105 81,939 809,834 5,313 14,221 3,117 Diluted weighted average shares outstanding 45,367,932 45,723,524 46,006,027 Anti-dilutive shares excluded from the above reconciliation Stock options Warrants Restricted stock units Performance stock units (2) 126,667 4,053,670 68,654 322,943 110,000 110,000 — — — — — — (1) For the year ended December 31, 2017, Ambac has a net loss and accordingly excluded all potentially dilutive securities from the determination of diluted loss per share as their impact was anti-dilutive. (2) Performance stock units are reflected herein at their target issuance amounts. Vesting of these units is contingent upon meeting certain performance metrics. Although a portion of these performance metrics have been achieved as of the respective period end, it is possible that awards may no longer meet the metric at the end of the performance period. 6. FINANCIAL GUARANTEES IN FORCE Financial guarantees outstanding includes the exposures of policies that insure variable interest entities (“VIEs”) consolidated in accordance with ASC Topic 810, Consolidation. Financial guarantees outstanding includes the exposure of policies that insure capital appreciation bonds which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bonds. Financial guarantees outstanding exclude the exposures of policies that insure bonds which have been called, pre-refunded or refunded. The gross par amount of financial guarantees outstanding was $67,140,000 and $86,373,000 at December 31, 2017 and 2016, respectively. The par amount of financial guarantees outstanding, net of reinsurance, was $62,716,000 and $79,346,000 at December 31, 2017 and 2016, respectively. | Ambac Financial Group, Inc. 104 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) As of December 31, 2017 and 2016, the guarantee portfolio was diversified by type of guaranteed bond as shown in the following table: Net Par Outstanding December 31, Public Finance: Lease and tax-backed revenue Housing revenue General obligation Utility revenue Transportation revenue Higher education Health care revenue Other Total Public Finance Structured Finance: Mortgage-backed and home equity Investor-owned utilities Student loan Asset-backed (1) CDOs Other Total Structured Finance International Finance: Investor-owned and public utilities Sovereign/sub-sovereign Asset-backed (1) Transportation Mortgage-backed and home equity CDOs Other Total International Finance Total 2017 2016 $ 11,893,000 $ 15,688,000 6,312,000 6,257,000 2,212,000 2,002,000 1,642,000 807,000 963,000 6,508,000 9,867,000 4,298,000 3,860,000 2,339,000 1,484,000 1,018,000 32,088,000 45,062,000 7,267,000 3,274,000 1,238,000 443,000 33,000 1,561,000 13,816,000 5,696,000 5,664,000 2,609,000 1,777,000 246,000 — 820,000 16,812,000 $ 62,716,000 $ 9,383,000 3,833,000 1,388,000 565,000 132,000 1,650,000 16,951,000 6,168,000 5,211,000 2,951,000 1,700,000 254,000 186,000 863,000 17,333,000 79,346,000 (1) At December 31, 2017 and 2016, all asset-backed net par amounts outstanding relate to commercial asset-based transactions. As of December 31, 2017 and 2016, the International Finance guaranteed portfolio by location of risk was as outlined in the table below: Net Par Outstanding December 31, United Kingdom Italy Austria Australia France Internationally diversified (1) Other international Total International Finance 2017 2016 $ 13,554,000 $ 12,798,000 877,000 770,000 608,000 329,000 368,000 306,000 898,000 696,000 1,393,000 286,000 648,000 614,000 $ 16,812,000 $ 17,333,000 (1) Internationally diversified obligations represent pools of geographically diversified exposures which may include components of U.S. exposure. Gross financial guarantees in force (principal and interest) were $108,550,000 and $137,745,000 at December 31, 2017 and 2016, respectively. Net financial guarantees in force (after giving effect to reinsurance) were $101,223,000 and $126,306,000 as of December 31, 2017 and 2016, respectively. In the United States, California, New York and New Jersey were the states with the highest aggregate net par amounts in force, accounting for 10.1%, 5.8% and 5.2% of the total at December 31, 2017, respectively. No other state accounted for more than 5.0%. The highest single insured risk represented 2.6% of the aggregate net par amount guaranteed. | Ambac Financial Group, Inc. 105 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) 7. FINANCIAL GUARANTEE INSURANCE CONTRACTS Amounts presented in this Note relate only to Ambac’s non-derivative insurance business for insurance policies issued to beneficiaries, including VIEs, for which we do not consolidate the VIE. Net Premiums Earned: Below is the gross premium receivable roll-forward (direct and assumed contracts) for the affected periods: Year Ended December 31, Beginning premium receivable Premium receipts Adjustments for changes in expected and contractual cash flows Accretion of premium receivable discount Changes to uncollectable premiums Other adjustments (including foreign exchange) Ending premium receivable (1) 2017 2016 2015 $ 661,337 $ 831,575 $ 1,000,607 (81,597) (30,334) 16,162 (141) 20,885 (77,038) (78,528) 18,637 6,054 (39,363) $ 586,312 $ 661,337 $ (108,029) (64,740) 24,628 2,540 (23,431) 831,575 (1) Gross premium receivable includes premiums to be received in foreign denominated currencies most notably in British Pounds and Euros. At December 31, 2017, 2016 and 2015 premium receivables include British Pounds of $151,852 (£112,342), $177,878 (£144,393) and $226,994 (£154,135), respectively, and Euros of $36,001 (£29,976), $34,866 (€33,108) and $43,451 (€40,014), respectively. In structured finance transactions, the priority for the payment of financial guarantee premiums to Ambac, as required by bond indentures of insured structured finance obligations, is generally senior in the waterfall. Additionally, trustees and other parties are required under the Second Amended Plan of Rehabilitation and related court orders to continue to pay installment premiums, notwithstanding the Segregated Account Rehabilitation Proceedings. In evaluating the credit quality of the premium receivables, management evaluates the transaction waterfall structures and the internal ratings of the transactions underlying the premium receivables. Uncollectable premiums are determined on a policy basis and utilize a combination of historical premium collection data in addition to cash flow analysis to determine if an impairment in the related policy's premium receivables exist. At December 31, 2017 and 2016, $9,331 and $9,186 respectively, of premium receivables were deemed uncollectable. As of December 31, 2017 and 2016, approximately 22% and 25%, respectively, of the premium receivables relate to transactions with non-investment grade internal ratings, comprised mainly of structured finance transactions, which comprised 16% and 16% of total premium receivables at December 31, 2017 and 2016, respectively. Past due premiums on policies insuring non-investment grade obligations amounted to less than $500 at December 31, 2017. The effect of reinsurance on premiums written and earned was as follows: 2017 2016 2015 Year Ended December 31, Written Earned Written Earned Written Earned Direct Assumed Ceded Net premiums $ $ (14,313) $ 190,496 $ (53,837) $ 215,564 $ (37,572) $ 336,025 — (2,104) 106 15,325 — (8,772) 85 18,362 — (3,001) (12,209) $ 175,277 $ (45,065) $ 197,287 $ (34,571) $ 87 23,517 312,595 Ambac’s accelerated premium revenue for retired obligations for the years ended December 31, 2017, 2016 and 2015, was $64,494, $52,416 and $137,400, respectively. The following table summarizes net premiums earned by location of risk: Year Ended December 31, United States United Kingdom Other international Total 2017 2016 2015 $ $ 134,099 $ 168,646 $ 32,928 8,250 24,470 4,171 175,277 $ 197,287 $ 229,658 68,799 14,138 312,595 | Ambac Financial Group, Inc. 106 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) The table below summarizes the future gross undiscounted premiums to be collected and future premiums earned, net of reinsurance at December 31, 2017: Three months ended: March 31, 2018 June 30, 2018 September 30, 2018 December 31, 2018 Twelve months ended: December 31, 2019 December 31, 2020 December 31, 2021 December 31, 2022 Five years ended: December 31, 2027 December 31, 2032 December 31, 2037 December 31, 2042 December 31, 2047 December 31, 2052 December 31, 2057 Total Future Premiums to be Collected (1) Future Premiums to be Earned Net of Reinsurance (1) $ 16,923 $ 13,801 14,779 13,282 55,203 52,282 45,848 43,678 193,190 150,385 82,597 29,169 13,599 3,586 92 17,561 17,294 16,604 16,150 61,368 57,263 52,149 48,447 197,446 131,682 72,520 24,833 12,694 4,651 298 $ 728,414 $ 730,960 (1) Future premiums to be collected are undiscounted and are used to derive the discounted premium receivable asset recorded on Ambac's balance sheet. Future premiums to be earned, net of reinsurance relate to the unearned premiums liability and deferred ceded premium asset recorded on Ambac’s balance sheet. The use of contractual lives for many bond types which do not have homogeneous pools of underlying collateral is required in the calculation of the premium receivable as further described in Note 2. Basis of Presentation and Significant Accounting Policies. This results in a different premium receivable balance than if expected lives were considered. If installment paying policies are retired or prepay early, premiums reflected in the premium receivable asset and amounts reported in the above table for such policies may not be collected. Future premiums to be earned also considers the use of contractual lives for many bond types which do not have homogeneous pools of underlying collateral, which may result in different unearned premium than if expected lives were considered. If those bonds types are retired early, premium earnings may be negative in the period of call or refinancing. Loss and Loss Expense Reserves: A loss reserve is recorded on the balance sheet on a policy-by-policy basis as further described in Note 2. Basis of Presentation and Significant Accounting Policies. Below are the components of the Loss and loss expense reserves liability and the Subrogation recoverable asset at December 31, 2017 and 2016: Balance Sheet Line Item Claims Accrued Interest Claims and Loss Expenses Recoveries Unearned Premium Revenue Gross Loss and Loss Expense Reserves Unpaid Claims Present Value of Expected Net Cash Flows December 31, 2017: Loss and loss expense reserves Subrogation recoverable Totals December 31, 2016: Loss and loss expense reserves Subrogation recoverable Totals $ $ $ $ 2,411,632 615,391 3,027,023 2,411,105 583,042 2,994,147 $ $ $ $ 667,988 171,755 839,743 529,703 132,139 661,842 $ $ $ $ 2,855,010 102,171 2,957,181 2,681,198 68,419 2,749,617 $ $ $ $ (1,054,113) $ (135,502) $ 4,745,015 (1,520,530) — (631,213) (2,574,643) $ (135,502) $ 4,113,802 (1,098,096) $ (143,141) $ 4,380,769 (1,468,331) — (684,731) (2,566,427) $ (143,141) $ 3,696,038 | Ambac Financial Group, Inc. 107 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Below is the loss and loss expense reserve roll-forward, net of subrogation recoverable and reinsurance, for the affected periods. Year Ended December 31, Beginning gross loss and loss expense reserves Reinsurance recoverable Beginning balance of net loss and loss expense reserves Losses and loss expenses (benefit) incurred: Current year Prior years Total (1)(2) Loss and loss expenses (recovered) paid: Current year Prior years Total Foreign exchange effect Ending net loss and loss expense reserves Reinsurance recoverable (3) Ending gross loss and loss expense reserves (4) 2017 2016 2015 3,696,038 30,767 3,665,271 $ $ 2,858,813 44,059 2,814,754 $ $ 3,798,733 100,355 3,698,378 5,691 507,495 513,186 825 133,427 134,252 28,939 6,675 (18,164) (11,489) 5,371 (944,955) (939,584) (77,578) 4,073,144 40,658 4,113,802 $ $ 3,665,271 30,767 3,696,038 $ $ 1,183 (769,890) (768,707) — 90,086 90,086 (24,831) 2,814,754 44,059 2,858,813 $ $ $ $ (1) Total losses and loss expenses (benefit) includes $(20,348), $5,421 and $47,085 for the years ended December 31, 2017, 2016 and 2015, respectively, related to ceded reinsurance. (2) Ambac records the impact of estimated recoveries related to securitized loans in RMBS transactions that breached certain R&Ws within losses and loss expenses (benefit). The losses and loss expense (benefit) incurred associated with changes in estimated representation and warranties for the year ended December 31, 2017, 2016 and 2015 was $72,003, $(71,369) and $(303,633), respectively. (3) Represents reinsurance recoverable on future loss and loss expenses. Additionally, the Balance Sheet line "Reinsurance recoverable on paid and unpaid losses" includes reinsurance recoverables (payables) of $339, $(349) and $(60) as of December 31, 2017, 2016 and 2015, respectively, related to previously presented loss and loss expenses and subrogation. (4) Includes Euro denominated gross loss and loss expense reserves of $21,116 (€17,582), $21,375 (€20,297) and $19,019 (€17,515) at December 31, 2017, 2016 and 2015, respectively. For 2017, the net adverse development in prior years was primarily the result of negative development in certain public finance transactions, including Puerto Rico, and interest accrued on Deferred Amounts partially offset by positive developments in certain Ambac UK transactions, including a benefit related to a confidential settlement of litigation brought by Ambac UK in the name of Ballantyne Re plc ("Ballantyne"). • Puerto Rico Ambac has exposure to the Commonwealth of Puerto Rico (the "Commonwealth") and its instrumentalities across several different issuing entities. Each has its own credit risk profile attributable to discrete revenue sources, direct general obligation pledges and general obligation guarantees. The Commonwealth of Puerto Rico and certain of its instrumentalities have and will continue to default on debt service payments, including payments owed on bonds insured by Ambac Assurance. Ambac Assurance may be required to make significant amounts of policy payments over the next several years, the recoverability of which is subject to great uncertainty, which may lead to material permanent losses. Our exposure to Puerto Rico is impacted by the amount of monies available for debt service, which is in turn affected by variability in economic growth, tax revenues, essential services expense as well as federal funding of Commonwealth needs. In addition, our exposure to Puerto Rico is impacted by the significant damage to the Commonwealth that was inflicted by Hurricane Maria, which made landfall on September 20, 2017, as well as Hurricane Irma, which passed just north of the island on September 6, 2017. The longer term recovery of the economy of the Commonwealth and its essential infrastructure will likely be highly dependent on the amount, timing and effectiveness of Federal aid. Substantial uncertainty also exists with respect to the ultimate outcome for creditors in Puerto Rico due to legislation enacted by the Commonwealth and the United States, including PROMESA, as well as actions taken in reliance on such laws, including Title III filings. Ambac Assurance is involved in multiple litigations relating to such actions and other issues and may not be successful in pursuing claims or protecting its interests. Ambac Assurance is also participating in a mediation process with respect to potential debt restructurings. Mediation may not be productive or may not resolve Ambac Assurance's claims in a manner that avoids significant losses. It is possible that certain restructuring process solutions, together with associated legislation, budgetary, and/or public policy proposals could be adopted and could significantly or further impair our exposures. While our reserving scenarios reflect a wide range of possible outcomes reflecting the significant uncertainty regarding future developments and outcomes, given our exposure to Puerto Rico and the economic, fiscal, legal and political uncertainties associated | Ambac Financial Group, Inc. 108 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) therewith as well as the uncertainties emanating from the damage caused by hurricanes Maria and Irma, our loss reserves may ultimately prove to be insufficient to cover our losses, potentially by a material amount, and may be subject to material volatility. Ambac has considered these developments and other factors in evaluating its Puerto Rico loss reserves. During the year ended December 31, 2017, Ambac had incurred losses associated with its Domestic Public Finance insured portfolio of $476,303, which was significantly impacted by the continued uncertainty and volatility of the situation in Puerto Rico. While management believes its reserves are adequate to cover losses in its Public Finance insured portfolio, there can be no assurance that Ambac may not incur additional losses in the future, particularly given the developing economic, political, and legal circumstances in Puerto Rico. Such additional losses may have a material adverse effect on Ambac’s results of operations and financial condition. For public finance credits, including Puerto Rico, as well as other issuers, for which Ambac has an estimate of expected loss at December 31, 2017, the possible increase in loss reserves under stress or other adverse conditions and circumstances was estimated to be approximately $1,500,000. However, there can be no assurance that losses may not exceed such amount. • Ballantyne Litigation On March 25, 2017, Ambac UK agreed in principle to a confidential settlement of litigation brought by Ambac UK in the name of Ballantyne against J.P. Morgan Investment Management Inc. ("JPMIM") relating to the management of Ballantyne’s investment accounts, which were funded with the proceeds of notes issued in 2006 in connection with a structured reinsurance transaction and guaranteed in part by Ambac UK. On April 11, 2017, Ambac UK, Ballantyne and JPMIM signed a settlement agreement. Pursuant to the settlement, Ballantyne received a payment of $325,600 from JPMIM in return for releases of all claims by Ballantyne and Ambac UK. As a result of the settlement, Ambac recognized an incremental benefit through a reduction in losses and loss expenses of approximately $91,600 in the first quarter of 2017. Ambac had previously included an estimated benefit through a reduction of loss and loss expense reserves of approximately $53,000 related to our probability weighted estimate of the value of the litigation. The total $144,600 benefit recognized from the settlement of the litigation will reduce the ultimate Ballantyne claims Ambac UK is expecting to pay and not result in a direct cash payment to Ambac UK. For 2016, the net positive development in prior years was primarily the result of lower projected losses in the RMBS portfolio due to improved deal performance and higher representation and warranty subrogation recoveries, and the impact of executed commutations in the student loan portfolio. This is partially offset by negative development in Puerto Rico, the adverse impact of foreign currency rate movements on the Ambac UK portfolio and interest accrued on Deferred Amounts. For 2015, the net positive development in prior years was primarily due to increases in our estimate of RMBS R&W recoveries as a result of continuous efforts and ongoing assessments of the value of our claims, as well as declines in interest rates on RMBS, student loans and Ambac UK credits, reduced claims expectations for an Ambac UK transaction resulting from proactive remediation efforts and the impact of executed commutations in the student loan portfolio. This was partially offset by negative development in Puerto Rico, the adverse impact of foreign currency rate movements on the Ambac UK portfolio and interest accrued on Deferred Amounts. | Ambac Financial Group, Inc. 109 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) The tables below summarize information related to policies currently included in Ambac’s loss and loss expense reserves or subrogation recoverable at December 31, 2017 and 2016. Gross par exposures include capital appreciation bonds which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bond. The weighted average risk-free rate used to discount loss reserves at December 31, 2017 and 2016 was 2.5% and 2.7%, respectively. Number of policies Remaining weighted-average contract period (in years) (1) Gross insured contractual payments outstanding: Principal Interest Total Gross undiscounted claim liability (2) Discount, gross claim liability Gross claim liability before all subrogation and before reinsurance Less: Gross RMBS subrogation (3) Discount, RMBS subrogation Discounted RMBS subrogation, before reinsurance Less: Gross other subrogation (4) Discount, other subrogation Discounted other subrogation, before reinsurance Gross claim liability, net of all subrogation and discounts, before reinsurance Less: Unearned premium revenue Plus: Loss expense reserves Gross loss and loss expense reserves Reinsurance recoverable reported on Balance Sheet (5) $ $ $ I IA Surveillance Categories as of December 31, 2017 V III IV II 26 10 20 23 26 10 22 24 179 13 Total 277 17 4 4 $ 1,046,267 $ 531,190 $ 1,199,909 $ 1,998,861 $ 6,862,281 531,657 584,098 413,045 7,182,715 2,469,765 $ 1,577,924 4,434 $ $ 1,115,288 56,659 $ $ 1,612,954 77,289 $ $ 9,181,576 $ 1,412,976 $ 9,332,046 $ 6,409,340 $ $ $ 48,562 $11,687,070 16,332 64,894 64,863 11,197,612 $22,884,682 $ 8,025,561 (465) (13,095) (12,250) (643,897) (616,559) (4,739) (1,291,005) $ 3,969 $ 43,564 $ 65,039 $ 769,079 $ 5,792,781 $ 60,124 $ 6,734,556 — — — — — — — — — — — — — (1,857,502) — 23,115 — (1,857,502) — 23,115 — (1,834,387) — (1,834,387) (7,990) 5,169 (9,371) 2,550 (53,070) (743,456) (13,191) (827,078) 8,349 67,045 3,709 86,822 (2,821) (6,821) (44,721) (676,411) (9,482) (740,256) 3,969 $ 40,743 $ 58,218 $ 724,358 $ 3,281,983 $ 50,642 $ 4,159,913 (2,126) 16,116 17,959 202 $ $ (9,990) 3,242 33,995 4,894 $ $ (12,238) 665 46,645 9,424 $ $ (46,086) 13,331 691,603 (64,786) (276) (135,502) 56,037 $ 3,273,234 $ — 50,366 89,391 $ 4,113,802 38,465 $ (11,988) $ — $ 40,997 (1) Remaining weighted-average contract period is weighted based on projected gross claims over the lives of the respective policies. (2) Gross undiscounted claim liability includes unpaid claims, including accrued interest on Deferred Amounts, on policies allocated to the Segregated Account and Ambac's estimate of expected future claims. (3) RMBS subrogation represents Ambac’s estimate of subrogation recoveries from RMBS transaction sponsors for representation and warranty ("R&W") breaches. (4) Other subrogation represents subrogation related to excess spread and other contractual cash flows on public finance and structured finance transactions including RMBS. (5) Reinsurance recoverable reported on Balance Sheet includes reinsurance recoverables of $40,658 related to future loss and loss expenses and $339 related to presented loss and loss expenses and subrogation. | Ambac Financial Group, Inc. 110 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Number of policies Remaining weighted-average contract period (in years) (1) Gross insured contractual payments outstanding: Principal Interest Total Gross undiscounted claim liability (2) Discount, gross claim liability Gross claim liability before all subrogation and before reinsurance Less: Gross RMBS subrogation (3) Discount, RMBS subrogation Discounted RMBS subrogation, before reinsurance Less: Gross other subrogation (4) Discount, other subrogation Discounted other subrogation, before reinsurance Gross claim liability, net of all subrogation and discounts, before reinsurance Less: Unearned premium revenue Plus: Loss expense reserves Gross loss and loss expense reserves Reinsurance recoverable reported on Balance Sheet (5) $ $ $ $ $ Surveillance Categories as of December 31, 2016 I IA II III IV V Total 19 9 22 8 26 30 43 17 169 14 3 5 282 16 $ 918,456 345,802 $ 1,264,258 3,439 (314) $ $ $ 733,036 $ 1,992,543 $ 1,779,889 $ 7,926,991 199,631 7,080,969 1,110,051 2,275,421 932,667 $ 9,073,512 $ 2,889,940 $10,202,412 21,175 $ 547,550 $ 861,455 $ 6,139,060 $ $ $ 49,247 $13,400,162 14,185 11,026,059 63,432 $24,426,221 63,431 $ 7,636,110 (1,243) (331,234) (256,108) (710,608) (5,859) (1,305,366) 3,125 $ 19,932 $ 216,316 $ 605,347 $ 5,428,452 $ 57,572 $ 6,330,744 — — — — — — — — — — — — — — — — (1,926,165) — (1,926,165) — 19,130 — 19,130 — (1,907,035) — (1,907,035) (14,529) (118,272) (593,919) (12,751) (739,471) 6,526 13,426 56,273 3,854 80,079 (8,003) (104,846) (537,646) (8,897) (659,392) 3,125 $ 19,932 $ 208,313 $ 500,501 $ 2,983,771 $ 48,675 $ 3,764,317 (2,394) (1,807) (49,578) 6,621 7,352 120 $ $ 339 18,464 6,063 $ $ 777 159,512 2,737 $ $ (31,785) 11,036 (57,194) 56,089 (383) (143,141) — 74,862 479,752 $ 2,982,666 $ 48,292 $ 3,696,038 39,352 $ (17,854) $ — $ 30,418 (1) Remaining weighted-average contract period is weighted based on projected gross claims over the lives of the respective policies. (2) Gross undiscounted claim liability includes unpaid claims, including accrued interest on Deferred Amounts, on policies allocated to the Segregated Account and Ambac's estimate of expected future claims. (3) RMBS subrogation represents Ambac’s estimate of subrogation recoveries from RMBS transaction sponsors for R&W breaches. (4) Other subrogation represents subrogation related to excess spread and other contractual cash flows on public finance and structured finance transactions, including RMBS. (5) Reinsurance recoverable reported on Balance Sheet includes reinsurance recoverables of $30,767 related to future loss and loss expenses and $(349) related to presented loss and loss expenses and subrogation. Representation and Warranty Recoveries: Ambac records estimated subrogation recoveries for breaches of R&Ws by sponsors of certain RMBS transactions. For a discussion of the approach utilized to estimate R&W subrogation recoveries, see Note 2. Basis of Presentation and Significant Accounting Policies. R&W subrogation may include estimates of potential sponsor settlements, but have not been subject to a sampling approach. However, such estimates are not material to Ambac’s financial results and therefore are included in the below table. Ambac has recorded R&W subrogation recoveries of $1,834,387, ($1,806,736 net of reinsurance) and $1,907,035, ($1,878,740 net of reinsurance) at December 31, 2017 and 2016, respectively. The balance of R&W subrogation recoveries and the related loss reserves at December 31, 2017 and 2016, are as follows: | Ambac Financial Group, Inc. 111 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) At December 31, 2017 At December 31, 2016 Gross loss reserves before subrogation recoveries (1) $ $ 1,366,483 1,351,640 $ $ Subrogation recoveries (2)(3) Gross loss reserves after subrogation recoveries (1,834,387) $ (467,904) (1,907,035) $ (555,395) (1) Amount represents gross loss reserves for policies that have established a representation and warranty subrogation recovery. Includes unpaid RMBS claims, including accrued interest on Deferred Amounts, on policies allocated to the Segregated Account. (2) The amount of recorded subrogation recoveries related to each securitization is limited to ever-to-date paid and unpaid losses plus the present value of expected future cash flows for each policy. To the extent losses have been paid but not yet fully recovered, the recorded amount of R&W subrogation recoveries may exceed the sum of the unpaid claims and the present value of expected cash flows for a given policy. The net cash inflow for these policies is recorded as a “Subrogation recoverable” asset. For those transactions where the subrogation recovery is less than the sum of unpaid claims and the present value of expected cash flows, the net cash outflow for these policies is recorded as a “Loss and loss expense reserves” liability. (3) The sponsor’s repurchase obligation may differ depending on the terms of the particular transaction and the status of the specific loan, such as whether it is performing or has been liquidated or charged off. Below is the rollforward of R&W subrogation for the affected periods: Year ended December 31, Discounted RMBS subrogation (gross of reinsurance) at beginning of year Impact of sponsor actions (1) All other changes (2) Discounted RMBS subrogation (gross of reinsurance) at end of year 2017 2016 2015 $ $ 1,907,035 $ 2,829,575 $ 2,523,540 — (72,648) (995,000) 72,460 1,834,387 $ 1,907,035 $ — 306,035 2,829,575 (1) Sponsor actions include loan repurchases, direct payments to Ambac and other contributions from sponsors. In January 2016, Ambac Assurance settled its RMBS-related disputes and litigation against JP Morgan Chase & Co. and certain of its affiliates (collectively "JP Morgan"). Pursuant to the settlement, JP Morgan paid Ambac Assurance $995,000 in cash in return for releases of all of Ambac Assurance's claims against JP Morgan arising from certain RMBS transactions insured by Ambac Assurance. Ambac Assurance also agreed to withdraw its objections to JP Morgan's global RMBS settlement with RMBS trustees. (2) All other changes which may impact R&W subrogation recoveries include changes in actual or projected collateral performance, changes in the creditworthiness of a sponsor and/or the projected timing of recoveries. All other changes may also include estimates of potential sponsor settlements that may not have been subject to a sampling approach or have been executed but the settlement amounts have not yet been received. Those that have not been subject to a sampling approach are not material to Ambac’s financial results and therefore are included in this table. Assumed Reinsurance: Assumed par outstanding was $219,100 and $243,700 at December 31, 2017 and 2016, respectively. Ceded Reinsurance: Ambac Assurance has reinsurance in place pursuant to surplus share treaty and facultative reinsurance agreements. The reinsurance of risk does not relieve Ambac Assurance of its original liability to its policyholders. In the event that any of Ambac Assurance’s reinsurers are unable to meet their obligations under reinsurance contracts, Ambac Assurance would, nonetheless, be liable to its policyholders for the full amount of its policy. Ambac Assurance’s reinsurance assets, including deferred ceded premiums and reinsurance recoverables on losses amounted to $93,192 at December 31, 2017. Credit exposure existed at December 31, 2017 with respect to reinsurance recoverables to the extent that any reinsurer may not be able to reimburse Ambac Assurance under the terms of these reinsurance arrangements. At December 31, 2017, there were ceded reinsurance balances payable of $37,876 offsetting this credit exposure. | Ambac Financial Group, Inc. 112 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) To minimize its credit exposure to losses from reinsurer insolvencies, Ambac Assurance (i) is entitled to receive collateral from its reinsurance counterparties in certain reinsurance contracts; and (ii) has certain cancellation rights that can be exercised by Ambac Assurance in the event of rating agency downgrades of a reinsurer (among other events and circumstances). Ambac Assurance held letters of credit and collateral amounting to $115,561 from its reinsurers at December 31, 2017. As of December 31, 2017, the aggregate amount of insured par ceded by Ambac Assurance to reinsurers under reinsurance agreements was $4,424,000 with the largest reinsurer accounting for $3,668,000 or 5.5% of gross par outstanding at December 31, 2017. The following table represents the percentage ceded to reinsurers and reinsurance recoverable at December 31, 2017 and its rating levels obtained from each reinsurers website as of February 27, 2018: Reinsurers Assured Guaranty Re Ltd Assured Guaranty Corporation Sompo Japan Nipponkoa Insurance, Inc. Total Moody’s Rating Percentage Ceded Par Net Unsecured Reinsurance Recoverable(1) NR A3 A1 82.9% 9.2 7.9 100% $ $ — — — — (1) Represents reinsurance recoverables on paid and unpaid losses and deferred ceded premiums, net of ceded premium payables due to reinsurers, letters of credit, and collateral posted for the benefit of Ambac Assurance. Insurance intangible asset: The insurance intangible amortization expense is included in insurance intangible amortization on the Consolidated Statements of Total Comprehensive Income (Loss). For the years ended December 31, 2017, 2016 and 2015, the insurance intangible amortization expense was $150,854, $174,608 and $169,557, respectively. As of December 31, 2017 and 2016, the gross carrying value of the insurance intangible asset was $1,581,156 and $1,534,419, respectively. Accumulated amortization of the insurance intangible asset was $734,183 and $572,339, as of December 31, 2017 and 2016, respectively, resulting in a net insurance intangible asset of $846,973 and $962,080, respectively. The estimated future amortization expense for the net insurance intangible asset is as follows: Future Insurance Intangible Amortization (1) 2018 2019 2020 2021 2022 Thereafter $ 76,638 $ 69,082 $ 63,892 $ 58,207 $ 53,908 $ 525,246 (1) The insurance intangible asset will be amortized using a level yield method based on par exposure of the related financial guarantee insurance or reinsurance contracts as described in Note 2. Basis of Presentation and Significant Accounting Policies. As exposures are called or prepay, amortization of the insurance intangible asset will be recognized earlier and the timing will differ from the amounts provided in the table above. 8. INSURANCE REGULATORY RESTRICTIONS United States Ambac Assurance and Everspan are domiciled in the State of Wisconsin and, as such, are subject to the insurance laws and regulations of the State of Wisconsin (the “Wisconsin Insurance Laws”) and are regulated by the OCI. In addition, Ambac Assurance and Everspan are subject to the insurance laws and regulations of the other jurisdictions in which they are licensed. Insurance laws and regulations applicable to financial guarantee insurers vary by jurisdiction. The laws and regulations generally require financial guarantors to maintain minimum standards of business conduct and solvency; to meet certain financial tests; and to file policy forms, premium rate schedules and certain reports with regulatory authorities, including information concerning capital structure, ownership, financial condition and enterprise risk. Regulated insurance companies are also required to file quarterly and annual statutory financial statements with the National Association of Insurance Commissioners (“NAIC”), and in each jurisdiction in which they are licensed. The level of supervisory authority that may be exercised by non-domiciliary insurance regulators varies by jurisdiction. Generally, however, non-domiciliary regulators are authorized to suspend or revoke the insurance license they issued and to impose restrictions on that license in the event that laws or regulations are breached by a regulated insurance company or in the event that continued or unrestricted licensing of the regulated insurance company constitutes a “hazardous condition” in the opinion of the regulator. As the principal, or domiciliary, regulator of Ambac Assurance and Everspan, OCI has primary regulatory authority, including with respect to the initiation and administration of rehabilitation or liquidation proceedings. Additionally, the accounts and operations of Ambac Assurance and Everspan are subject to periodic comprehensive examinations by the OCI. Wisconsin Insurance Laws require regulated insurance companies to maintain minimum standards of business conduct, maintain minimum surplus to policyholders, meet certain financial tests, and file certain reports, including information concerning their capital structure, ownership, financial condition and enterprise risk. Ambac Assurance and Everspan are not subject to risk-based capital requirements, since they are financial guarantee insurers. Ambac Assurance and Everspan are in compliance with minimum surplus levels. Wisconsin Insurance Laws also require prior approval by OCI of certain transactions between Ambac Assurance or Everspan and their respective affiliates. | Ambac Financial Group, Inc. 113 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) In addition, pursuant to the terms of the Settlement Agreement and the Stipulation and Order, Ambac Assurance must seek prior approval by OCI of certain corporate actions. The Settlement Agreement and Stipulation and Order include covenants which restrict the operations of Ambac Assurance. The Settlement Agreement will remain in force until the surplus notes that were issued pursuant to the Settlement Agreement have been redeemed, repurchased or repaid in full. The Stipulation and Order will remain in force for so long as OCI determines it to be necessary. Certain of the restrictions in the Settlement Agreement may be waived with the approval of the OCI and/or the requisite percentage of holders of surplus notes issued in connection with the Settlement Agreement. New York’s comprehensive financial guarantee insurance law defines the scope of permitted financial guarantee insurance and governs the conduct of business of all financial guarantors licensed to do business in New York, including Ambac Assurance and Everspan. The New York financial guarantee insurance law also establishes single risk and aggregate limits with respect to insured obligations insured by financial guarantee insurers. Such single risk limits are specific to the type of insured obligation (for example, municipal or asset-backed). Under the aggregate limits, policyholders’ surplus and contingency reserves must at least equal a percentage of aggregate net liability that is equal to the sum of various percentages of aggregate net liability for various categories of specified obligations. At December 31, 2017, Ambac Assurance is in compliance with applicable aggregate risk limits but not in compliance with applicable single risk limits. Through run-off of the portfolio, Ambac Assurance will continue to seek the reduction in its exposure for compliance with applicable single and aggregate risk limits, but may not be able to do so. Everspan is in compliance with all of such limits. Ambac Assurance’s statutory financial statements are prepared on the basis of accounting practices prescribed or permitted by Wisconsin Insurance law and OCI actions thereunder. A Wisconsin insurance company uses such statutory accounting practices prescribed or permitted by the State of Wisconsin for determining and reporting its financial condition and results of operations, including for determining its solvency under Wisconsin Insurance Law. The State of Wisconsin has adopted the applicable National Association of Insurance Commissioners (“NAIC”) accounting practices and procedures manual (“NAIC SAP”) as a component of prescribed practices by the State of Wisconsin. Ambac Assurance’s statutory policyholder surplus was $699,614 at December 31, 2017, as compared to $976,477 as of December 31, 2016. Statutory policyholder surplus differs from stockholders’ equity determined under GAAP principally due to statutory accounting rules that treat loss reserves, investments, consolidation of subsidiaries and variable interest entities, premiums earned and surplus notes differently. The OCI has prescribed or permitted accounting practices for Ambac Assurance. As a result of the prescribed and permitted practices discussed below, Ambac Assurance’s statutory surplus at December 31, 2017 and 2016 was lower by $104,097 and higher by $17,290, respectively, than if Ambac Assurance had reported such amounts in accordance with NAIC SAP. Prescribed Accounting Practices: • OCI has prescribed an accounting practice that differs from NAIC SAP. Paragraph 8 of Statement of Statutory Accounting Principles No. 60 “Financial Guaranty Insurance” (“SSAP 60”) allows for a deduction from loss reserves for the time value of money by application of a discount rate equal to the average rate of return on the admitted assets of the financial guaranty insurer as of the date of the computation of the reserve. The discount rate shall be adjusted at the end of each calendar year. Additionally, in accordance with paragraph 13.e of Statutory Accounting Principles No. 97 "Investments in Subsidiary, Controlled and Affiliated Entities" and paragraph 8 of Statutory Accounting Principles No. 5R “Liabilities, Contingencies and Impairments of Assets - Revised”, Ambac Assurance records probable losses on its subsidiaries for which it guarantees their obligations. Ambac also discounts probable losses on guarantees of subsidiary obligations using a discount rate equal to the average rate of return on its admitted assets. Ambac Assurance’s average rates of return on its admitted assets at December 31, 2017 and 2016 were 9.52% and 7.63%, respectively. OCI has directed Ambac Assurance to utilize a prescribed discount rate of 5.10% for the purpose of discounting both its loss reserves and its estimated impairment losses on subsidiary guarantees. • OCI has prescribed an additional accounting practice that differs from NAIC SAP. Paragraph 4 of Statement of Statutory Accounting Principles No. 41 “Surplus Notes” (“SSAP 41”) states that proceeds received by the issuer of surplus notes must be in the form of cash or other admitted assets having readily determinable values and liquidity satisfactory to the commissioner of the state of domicile. Under the statutory accounting principles as generally applied, surplus notes issued in conjunction with commutations or the settlement of claims would be valued at zero upon issuance pursuant to paragraph 4, SSAP 41. OCI has directed Ambac Assurance to record surplus notes issued in connection with commutations or the settlement of claims at full par value upon issuance as in these instances the surplus notes did not represent a contribution of capital, but rather a distribution of value from the common and preferred shareholders of Ambac Assurance. The surplus notes issued in connection with commutations or settlement of claims has a claim against surplus senior to the preferred and common shareholders. • OCI had extended the preceding prescribed practice related to surplus notes to the evaluation of other-than-temporary impairments for Ambac Assurance guaranteed securities held in the investment portfolio. Paragraph 35 of Statement of Statutory Accounting Principles No. 43R ”Loan-backed and Structured Securities” states that when an other-than-temporary impairment has occurred, the amount of the other-than-temporary impairment recognized as a realized loss shall equal the difference between the investment’s amortized cost basis and the present value of cash flows expected to be collected, discounted at the loan-backed or structured security’s effective interest rate. Under NAIC SAP, the present value of cash flows expected to be collected should include the fair value of surplus notes received from the Segregated Account, as required under the originally confirmed Segregated Account Rehabilitation Plan. OCI had prescribed an accounting practice that differed from NAIC SAP and has directed Ambac Assurance to utilize par value rather than fair value of these surplus notes in this computation. As a result of the amended Segregated Account Rehabilitation Plan becoming effective on June 12, 2014, this prescribed | Ambac Financial Group, Inc. 114 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) practice is no longer applicable. Ambac Assurance received a new prescribed practice from OCI with regard to the carrying value of investments in Ambac Assurance insured securities with policies that were allocated to the Segregated Account. The new prescribed practice, effective beginning June 11, 2014, exempts Ambac Assurance from evaluating such investments for other than temporary impairments and requires all such investments be reported at amortized cost regardless of its NAIC risk designation. This accounting determination is intended to recognize that Ambac Assurance continues to maintain statutory loss reserves without adjustment for the economic effects of its ownership of the insured investment securities, improve transparency to the users of the statutory financial statements and to minimize operational risks. As a result of the exit of the Segregated Account from rehabilitation on February 12, 2018, this prescribed practice will no longer be applicable. • OCI has prescribed an accounting practice related to the total liabilities and total surplus of the Segregated Account that are reported as discrete components of Ambac Assurance’s liabilities and surplus reported in Ambac Assurance’s statutory basis financial statements. Pursuant to this prescribed practice, the results of the Segregated Account are not included in Ambac Assurance’s financial statements if Ambac Assurance’s surplus is (or would be) less than the Minimum Surplus Amount (i.e., $100,000. As long as the surplus as regards to policyholders is not less than the Minimum Surplus Amount, payments by Ambac Assurance to the Segregated Account under the Aggregate Excess of Loss Reinsurance Agreement between Ambac Assurance (as reinsurer) and the Segregated Account were not capped. As a result of the exit of the Segregated Account from rehabilitation on February 12, 2018, this prescribed practice will no longer be applicable. Permitted Accounting Practices: • Wisconsin accounting practices for changes to contingency reserves differ from NAIC SAP. Under NAIC SAP, contributions to and releases from the contingency reserve are recorded via a direct charge or credit to surplus. Under the Wisconsin Administrative Code, contributions to and releases from the contingency reserve are to be recorded through underwriting income. Ambac Assurance received permission from OCI to record contributions to and releases from the contingency reserve and the related tax and loss bond impact, in accordance with NAIC SAP. • Ambac Assurance received permission from OCI to report investment holdings of Ambac Assurance insured securities as a separate invested asset on the balance sheet rather than combined with other bond investments. This permitted practice only impacts the balance sheet classification and has no impact on the valuation of the securities to which it applies or to statutory surplus. • Effective upon the exit of the Segregated Account from Rehabilitation and the merger of the Segregated Account with Ambac Assurance, Ambac Assurance received permission from OCI to restate its unassigned funds (surplus) balance to $100,000 with an offsetting reduction to gross paid-in and contributed surplus such that total surplus remains unchanged. United Kingdom The Prudential Regulatory Authority (“PRA”) and Financial Conduct Authority (“FCA”) (and their predecessor regulator the Financial Services Authority (“FSA”)) are the dual statutory regulator responsible for regulating the financial services industry in the United Kingdom, with the purpose of maintaining confidence in the U.K. financial system, providing public understanding of the system, securing the proper degree of protection for consumers and helping to reduce financial crime. In addition, the regulatory regime in the United Kingdom must comply with certain EU legislation binding on all EU member states. These regulators have exercised significant oversight of Ambac UK since 2008, after Ambac, Ambac Assurance and Ambac UK began experiencing financial stress. In 2009, Ambac UK’s license to write new business was curtailed by the FSA and the insurance license was limited to undertaking only run-off related activity. As such, Ambac UK is authorized to run-off its credit, suretyship and financial guarantee insurance portfolio in the United Kingdom, and to do the same through a branch in Milan, Italy, and a number of other European Union (“EU”) countries. EU legislation has allowed Ambac UK to conduct business in EU states other than the United Kingdom through a “passporting” arrangement, which eliminates the necessity of additional licensing or authorization in those other EU jurisdictions. The PRA requires that non-life insurance companies such as Ambac UK maintain a margin of solvency at all times in respect of the liabilities of the insurance company, the calculation of which depends on the type and amount of insurance business a company writes. These solvency requirements were amended on January 1, 2016 in order to implement the European Union's "Solvency II" directive on risk-based capital. Notwithstanding the foregoing, Ambac UK is deficient in terms of compliance with currently applicable regulatory capital requirements under Solvency II directive. The PRA and FCA are aware of the same, and dialogue between Ambac UK management and its regulators remains ongoing with respect to options for addressing the shortcoming, although such options remain few. Dividend Restrictions, Including Contractual Restrictions Due to losses experienced by Ambac Assurance, Ambac Assurance has been unable to pay common dividends to Ambac since 2008 and will be unable to pay common dividends in 2018 without the prior consent of the OCI, which is unlikely. Ambac Assurance’s ability to pay dividends is further restricted by the Settlement Agreement (as described below), by the terms of its AMPS (as described below) and by the Stipulation and Order. See Note 1. Background and Business Description for further information. Subject to the foregoing, pursuant to the Wisconsin Insurance Laws, Ambac Assurance and Everspan may declare dividends, subject to restrictions in their respective articles of incorporation, provided that, after giving effect to the distribution, such dividends would not violate certain statutory | Ambac Financial Group, Inc. 115 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) equity, solvency, income and asset tests. Board action authorizing a shareholder distribution by Ambac Assurance or Everspan (other than stock dividends) must be reported to the OCI at least 30 days prior to payment, unless the distribution is no more than 15% larger than for the corresponding period in the previous year. In addition, Wisconsin Insurance Laws restrict the payment of extraordinary dividends, which is any distribution which, together with distributions in the prior 12 months, is greater than the lesser of (a) 10% of policyholders’ surplus as of the preceding December 31, and (b) the greater of (i) statutory net income (loss) for the calendar year preceding the date of the dividend, minus realized capital gains for that calendar year or (ii) the aggregate of statutory net income (loss) for three calendar years preceding the date of the dividend, minus realized capital gains for those calendar years and minus dividends paid or credited within the first two of the three preceding calendar years. Extraordinary dividends must be reported to OCI at least 30 days prior to payment and are subject to disapproval by the OCI. UK law prohibits Ambac UK from declaring a dividend to its shareholders unless it has “profits available for distribution.” The determination of whether a company has profits available for distribution is based on its accumulated realized profits less its accumulated realized losses. While the UK insurance regulatory laws impose no statutory restrictions on a general insurer’s ability to declare a dividend, the PRA’s and FCA’s capital requirements in practice act as a restriction on the payment of dividends. Further, the FSA amended Ambac UK’s license in 2010 such that the PRA must specifically approve (“non-objection”) any transfer of value and/or assets from Ambac UK to Ambac Assurance or any other Ambac group company, other than in respect of certain disclosed contracts between the two parties (such as in respect of a management services agreement between Ambac Assurance and Ambac UK). Ambac UK is not expected to pay any dividends to Ambac Assurance for the foreseeable future. Pursuant to the Settlement Agreement Ambac Assurance may not make any “Restricted Payment” (which includes dividends from Ambac Assurance to Ambac) in excess of $5,000 in the aggregate per annum, other than Restricted Payments from Ambac Assurance to Ambac in an amount up to $7,500 per annum solely to pay operating expenses of Ambac. Concurrent with making any such Restricted Payment, a pro rata amount of Ambac Assurance's surplus notes would also need to be redeemed at par. Under the terms of Ambac Assurance’s Auction Market Preferred Shares (“AMPS”), dividends may not be paid on the common stock of Ambac Assurance unless all accrued and unpaid dividends on the AMPS for the then current dividend period have been paid, provided, that dividends on the common stock may be made at all times for the purpose of, and only in such amounts as are necessary for, enabling Ambac (i) to service its indebtedness for borrowed money as such payments become due or (ii) to pay its operating expenses. If dividends are paid on the common stock as provided in the prior sentence, dividends on the AMPS become cumulative until the date that all accumulated and unpaid dividends have been paid on the AMPS. The Stipulation and Order requires OCI approval for the payment of any dividend or distribution on the common stock of Ambac Assurance. 9. FAIR VALUE MEASUREMENTS The Fair Value Measurement Topic of the ASC establishes a framework for measuring fair value and disclosures about fair value measurements. Fair Value Hierarchy: The Fair Value Measurement Topic of the ASC specifies a fair value hierarchy based on whether the inputs to valuation techniques used to measure fair value are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect Company-based assumptions. The fair value hierarchy prioritizes model inputs into three broad levels as follows: Level 1 Level 2 Quoted prices for identical instruments in active markets. Assets and liabilities classified as Level 1 include US Treasury and other foreign government obligations traded in highly liquid and transparent markets, exchange traded futures contracts, variable rate demand obligations and money market funds. Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets. Assets and liabilities classified as Level 2 generally include investments in fixed income securities representing municipal, asset-backed and corporate obligations, certain interest rate swap contracts, and most long-term debt of variable interest entities consolidated under the Consolidation Topic of the ASC. Level 3 Model derived valuations in which one or more significant inputs or significant value drivers are unobservable. This hierarchy requires the use of observable market data when available. Assets and liabilities classified as Level 3 include credit derivative contracts, certain uncollateralized interest rate swap contracts, equity interests in Ambac sponsored special purpose entities and certain investments in fixed income securities. Additionally, Level 3 assets and liabilities generally include fixed income securities, loan receivables, and certain long-term debt of variable interest entities consolidated under the Consolidation Topic of the ASC. | Ambac Financial Group, Inc. 116 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) The following table sets forth the carrying amount and fair value of Ambac’s financial assets and liabilities as of December 31, 2017 and 2016, including the level within the fair value hierarchy at which fair value measurements are categorized. As required by the Fair Value Measurement Topic of the ASC financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Carrying Amount Total Fair Value Fair Value Measurements Categorized as: Level 1 Level 2 Level 3 December 31, 2017: Financial assets: Fixed income securities: Municipal obligations Corporate obligations Foreign obligations U.S. government obligations Residential mortgage-backed securities Collateralized debt obligations Other asset-backed securities Fixed income securities, pledged as collateral: U.S. government obligations Short term investments Other investments (1) Cash and cash equivalents Loans Derivative assets: Interest rate swaps—asset position Other assets Variable interest entity assets: Fixed income securities: Corporate obligations Restricted cash Loans Derivative assets: Currency swaps-asset position Total financial assets Financial liabilities: $ $ 779,834 860,075 26,543 85,408 2,251,333 51,037 597,942 99,719 557,270 431,630 623,703 10,358 73,199 5,979 779,834 860,075 26,543 85,408 2,251,333 51,037 597,942 99,719 557,270 413,977 623,703 10,284 73,199 5,979 2,914,145 2,914,145 978 978 11,529,384 11,529,384 $ — $ 450 $ 779,834 859,625 — — — — 736,017 — 72,540 — — 17,288 — 10,284 61,374 5,979 928 — 1,515,316 51,037 525,402 — 167,971 29,750 8,630 — 11,825 — — — — 2,914,145 — 11,529,384 25,615 85,408 — — — 99,719 389,299 56,498 615,073 — — — — 978 — 54,877 20,853,695 $ 54,877 20,835,968 $ $ — 1,173,321 $ 54,877 4,005,195 $ — 15,347,011 Long term debt, including accrued interest 1,428,680 1,369,499 Derivative liabilities: Credit derivatives Interest rate swaps—asset position Interest rate swaps—liability position Futures contracts Liabilities for net financial guarantees written (2) Variable interest entity liabilities: Long-term debt Derivative liabilities: 566 (627) 81,495 1,348 566 (627) 81,495 1,348 3,435,438 4,842,402 12,160,544 12,160,544 — — — — 1,348 — — 1,046,511 322,988 — (627) 81,495 — — 566 — — — 4,842,402 9,402,856 2,757,688 Interest rate swaps—liability position Total financial liabilities 2,205,264 19,312,708 $ 2,205,264 20,660,491 $ $ — 1,348 $ 2,205,264 12,735,499 $ — 7,923,644 | Ambac Financial Group, Inc. 117 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Carrying Amount Total Fair Value Fair Value Measurements Categorized as: Level 1 Level 2 Level 3 December 31, 2016: Financial assets: Fixed income securities: Municipal obligations Corporate obligations Foreign obligations U.S. government obligations U.S. agency obligations $ 374,368 $ 374,368 $ — $ 374,368 $ 1,802,165 1,802,165 43,135 36,186 4,060 43,135 36,186 4,060 Residential mortgage-backed securities 2,351,595 2,351,595 Collateralized debt obligations Other asset-backed securities Fixed income securities, pledged as collateral: U.S. government obligations Short term investments Other investments (1) Cash and cash equivalents Loans Derivative assets: Interest rate swaps—asset position Interest rate swaps—liability position Futures contracts Other assets Variable interest entity assets: Fixed income securities: Corporate obligations Restricted cash Derivative assets: Currency swaps-asset position Loans Total financial assets Financial liabilities: Obligations under investment agreements Long term debt, including accrued interest Derivative liabilities: Credit derivatives Interest rate swaps—asset position Interest rate swaps—liability position 113,923 828,783 64,905 430,788 450,307 91,025 4,160 77,206 — 536 7,382 113,923 828,783 64,905 430,788 435,237 91,025 4,066 77,206 — 536 7,382 2,622,566 2,622,566 4,873 4,873 80,407 10,658,963 20,047,333 82,358 1,536,352 $ $ 80,407 10,658,963 20,032,169 82,333 1,494,340 $ $ $ $ 15,349 (61,839) 365,776 15,349 (61,839) 365,776 Liabilities for net financial guarantees written (2) 3,009,943 4,490,070 Variable interest entity liabilities: Long-term debt Derivative liabilities: 11,155,936 11,155,936 Interest rate swaps—liability position 2,078,601 2,078,601 Currency swaps—liability position — — — 42,212 36,186 — — — — 64,905 371,367 83,791 46,587 — — — 536 — — 4,873 — — — — — — — — — — 1,802,165 923 — 4,060 1,654,882 113,923 762,793 — 59,421 — 44,438 — 16,950 — — — — — 80,407 1,147,728 — (61,839) 220,587 — — — — — — 696,713 — 65,990 — — 14,934 — 4,066 60,256 — — 7,382 2,622,566 — — 82,333 346,612 15,349 — 145,189 4,490,070 8,573,716 2,582,220 2,078,601 — — — 650,457 $ 4,914,330 $ 14,130,870 — 10,658,963 — $ — $ Total financial liabilities $ 18,182,476 $ 19,620,566 $ — $ 11,958,793 $ 7,661,773 (1) Excluded from the fair value measurement categories in the table above are investment funds of $310,441 and $336,513 as of December 31, 2017 and 2016, respectively, which are measured using NAV per share as a practical expedient. | Ambac Financial Group, Inc. 118 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) (2) The carrying value of net financial guarantees written includes the following balance sheet items: Premium receivables; Reinsurance recoverable on paid and unpaid losses; Deferred ceded premium; Subrogation recoverable; Insurance intangible asset; Unearned premiums; Loss and loss expense reserves; Ceded premiums payable, premiums taxes payable and other deferred fees recorded in Other liabilities. Determination of Fair Value: When available, Ambac uses quoted active market prices specific to the financial instrument to determine fair value, and classifies such items within Level 1. The determination of fair value for financial instruments categorized in Level 2 or 3 involves significant judgment due to the complexity of factors contributing to the valuation. Third-party sources from which we obtain independent market quotes also use assumptions, judgments and estimates in determining financial instrument values and different third parties may use different methodologies or provide different values for financial instruments. In addition, the use of internal valuation models may require assumptions about hypothetical or inactive markets. As a result of these factors, the actual trade value of a financial instrument in the market, or exit value of a financial instrument position by Ambac, may be significantly different from its recorded fair value. Ambac’s financial instruments carried at fair value are mainly comprised of investments in fixed income securities, equity interests in pooled investment funds, derivative instruments, variable interest entity assets and liabilities and equity interests in Ambac sponsored special purpose entities. Valuation of financial instruments is performed by Ambac’s finance group using methods approved by senior financial management with consultation from risk management and portfolio managers as appropriate. Preliminary valuation results are discussed with portfolio managers quarterly to assess consistency with market transactions and trends as applicable. Market transactions such as trades or negotiated settlements of similar positions, if any, are reviewed to validate fair value model results. However many of the financial instruments valued using significant unobservable inputs have very little or no observable market activity. Methods and significant inputs and assumptions used to determine fair values across portfolios are reviewed quarterly by senior financial management. Other valuation control procedures specific to particular portfolios are described further below. We reflect Ambac’s own creditworthiness in the fair value of financial liabilities by including a credit valuation adjustment (“CVA”) in the determination of fair value. A decline (increase) in Ambac’s creditworthiness as perceived by market participants will generally result in a higher (lower) CVA, thereby lowering (increasing) the fair value of Ambac’s financial liabilities as reported. Fixed Income Securities: The fair values of fixed income investment securities are based primarily on market prices received from dealer quotes or alternative pricing sources with reasonable levels of price transparency. Because many fixed income securities do not trade on a daily basis, pricing sources apply available market information through processes such as matrix pricing to calculate fair value. Such prices generally consider a variety of factors, including recent trades of the same and similar securities. In those cases, the items are classified within Level 2. For those fixed income investments where quotes were not available or cannot be reasonably corroborated, fair values are based on internal valuation models. Key inputs to the internal valuation models generally include maturity date, coupon and yield curves for asset-type and credit rating characteristics that closely match those characteristics of the specific investment securities being valued. Items valued using valuation models are classified according to the lowest level input or value driver that is significant to the valuation. Thus, an item may be classified in Level 3 even though there may be significant inputs that are readily observable. Longer (shorter) expected maturities or higher (lower) yields used in the valuation model will, in isolation, result in decreases (increases) in fair value. Generally, lower credit ratings or longer expected maturities will be accompanied by higher yields used to value a security. At December 31, 2017, approximately 6%, 79%, and 15% of the investment portfolio (excluding variable interest entity investments) was valued using dealer quotes, alternative pricing sources with reasonable levels of price transparency and internal valuation models, respectively. At December 31, 2016, approximately 5%, 82%, and 13% of the fixed income investment portfolio (excluding variable interest entity investments) was valued using dealer quotes, alternative pricing sources with reasonable levels of price transparency and internal valuation models, respectively. Among the investments valued using internal valuation models are Ambac insured securities for which projected cash flows consist solely of Deferred Amounts and interest thereon. These securities are internally valued based upon the valuation of Ambac Assurance's surplus notes and comprise 13% and 12% of the portfolio at December 31, 2017 and 2016, respectively. Ambac performs various review and validation procedures to quoted and modeled prices for fixed income securities, including price variance analyses, missing and static price reviews, overall valuation analyses by senior traders and finance managers and reviews associated with our ongoing impairment analysis. Unusual prices identified through these procedures will be evaluated further against additional market data (if available) and/or internally modeled prices, and the pricing source values will be challenged as necessary. Price challenges generally result in the use of the pricing source’s quote as originally provided or as revised by the source following their internal diligence process. A price challenge may result in a determination by either the pricing source or Ambac management that the pricing source cannot provide a reasonable value for a security or cannot adequately support a quote, in which case Ambac would resort to using either other quotes or internal models. Results of price challenges are reviewed by senior traders and finance managers. Information about the valuation inputs for fixed income securities classified as Level 3 is included below: Residential mortgage-backed securities: A portion of these securities are guaranteed under policies that were subject to the Segregated Account Rehabilitation Plan and had projected future cash flows consisting solely of Deferred Amounts under such policies including interest thereon. The fair value of such securities classified as Level 3 was $709,950 and $696,713 at December 31, 2017 and 2016, respectively. Fair value | Ambac Financial Group, Inc. 119 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) was calculated based on the valuation of Ambac Assurance surplus notes which, under the terms of the Segregated Account Rehabilitation Plan effective in 2017, were to be redeemed in proportion with the payment of Deferred Amounts on or about the dates when such payments are made. Following the consummation of the Rehabilitation Exit Transactions on February 12, 2018, under which surplus notes tendered did receive consideration equal that paid to settle Deferred Amounts, remaining surplus notes outstanding will no longer be treated pari passu with payments on insurance obligations. Refer to Note 1. Background and Business Description for further details of the Rehabilitation Exit Transactions. The remaining portion of Level 3 residential mortgage-backed securities are an Ambac-insured re-REMIC containing distressed mortgage- backed securities as collateral, the fair value of which was $26,067 at December 31, 2017. There were $0 such securities classified as Level 3 as of December 31, 2016. Fair value was calculated using a discounted cash flow approach with expected future cash flows discounted using a yield consistent with the security type and rating. Significant inputs for the valuation at December 31, 2017 were as follows: December 31, 2017: a. Coupon rate: 2.05% b. Average Life: 0.65 years c. Yield: 10.00% Other asset-backed securities: These securities are a subordinated tranche of a resecuritization collateralized by Ambac-insured military housing bonds. The fair value of such securities classified as Level 3 was $72,540 and $65,990 at December 31, 2017 and 2016, respectively. Fair value was calculated using a discounted cash flow approach with expected future cash flows discounted using a yield consistent with the security type and rating. Significant inputs for the valuation at December 31, 2017 and 2016 include the following weighted averages: December 31, 2017: a. Coupon rate: 5.97% b. Average Life: 17.02 years c. Yield: 12.00% Other Investments: December 31, 2016: a. Coupon rate: 5.93% b. Average Life: 17.74 years c. Yield: 13.50% Other investments primarily relate to investments in pooled investment funds. The fair value of pooled investment funds is determined using dealer quotes or alternative pricing sources when such investments have readily determinable fair values. When fair value is not readily determinable, pooled investment funds are valued using the net asset value (“NAV”) per share as a practical expedient as permitted under the Fair Value Measurement Topic of the ASC. Refer to Note 10. Investments for additional information about such investments in pooled funds that are reported at fair value using NAV as a practical expedient. Other investments also includes Ambac's equity interest in a non-consolidated VIE, which is carried under the equity method. Valuation of this equity interest is internally calculated using a discounted cash flow approach and is classified as Level 3. Derivative Instruments: Ambac’s derivative instruments primarily comprise interest rate and credit default swaps, and exchange traded futures contracts. Fair value is determined based upon market quotes from independent sources, when available. When independent quotes are not available, fair value is determined using valuation models. These valuation models require market-driven inputs, including contractual terms, credit spreads and ratings on underlying referenced obligations, yield curves and tax-exempt interest ratios. The valuation of certain interest rate as well as all credit derivative contracts also require the use of data inputs and assumptions that are determined by management and are not readily observable in the market. Under the Fair Value Measurement Topic of the ASC, Ambac is required to consider its own credit risk when measuring the fair value of derivatives and other liabilities. The fair value of credit derivative liabilities was reduced by $60 and $1,924 at December 31, 2017 and 2016, respectively, as a result of incorporating an Ambac CVA into the valuation model for these contracts. Interest rate swaps may also require an adjustment to fair value to reflect Ambac’s credit risk. During the three months ended June 30, 2017, interest rate swaps that had incorporated an Ambac CVA into the valuation were terminated. As a result, derivative liabilities are no longer reduced as a result of Ambac CVA at December 31, 2017 compared to $44,973 at December 31, 2016. Additional factors considered in estimating the amount of any Ambac CVA on such contracts include collateral posting provisions, right of set-off with the counterparty, the period of time remaining on the derivative and the pricing of recent terminations. As described further below, certain valuation models require other inputs that are not readily observable in the market. The selection of a model to value a derivative depends on the contractual terms of, and specific risks inherent in the instrument as well as the availability of pricing information in the market. Derivatives that are less complex may be valued primarily by reference to interest rates and yield curves that are observable and regularly quoted, such as interest rate swaps, for which we generally utilize vendor-developed models. These models provide the net present value of | Ambac Financial Group, Inc. 120 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) the derivatives based on contractual terms and observable market data. Downgrades of Ambac Assurance, as guarantor of the derivatives, have increased collateral requirements and triggered termination provisions in certain interest rate swaps. Termination activity since the initial rating downgrades of Ambac Assurance provided additional information about the replacement and/or exit value of certain derivatives, which has been incorporated into the fair value of these derivatives as appropriate. Generally, the need for counterparty (or Ambac) CVAs is mitigated by the existence of collateral posting agreements under which adequate collateral has been posted. Derivative contracts entered into with financial guarantee customers are not subject to collateral posting agreements. Counterparty credit risk related to such customer derivative assets is included in our fair value adjustments. The valuation of such derivatives is generally classified as Level 3. For derivatives that do not trade, or trade in less liquid markets such as credit derivatives, an internal model is generally used because such instruments tend to be unique, contain complex or heavily modified and negotiated terms, and pricing information is not readily available in the market. Derivative fair value models and the related assumptions are continuously re-evaluated by management and enhanced, as appropriate, based on improvements in modeling techniques. Ambac has not made any significant changes to its modeling techniques or related model inputs for the periods presented. Credit Derivatives (“CDS”): Fair value of Ambac’s CDS is determined using internal valuation models and represents the hypothetical transfer cost of the contract calculated as the difference between the net present value of the projected fees receivable under the CDS and our estimate of the fees a financial guarantor of comparable credit quality would charge to provide the same protection at the balance sheet date. Financial guarantee contracts, including CDS, are typically priced to capture some portion of the spread that would be observed in the capital markets for the underlying (insured) obligation. Because of this relationship and in the absence of severe credit deterioration, changes in the fair value of our credit default swaps will generally be less than changes in the fair value of the underlying reference obligations. Key variables used in the valuation of our credit derivatives include the balance of unpaid notional, expected term, fair values of the underlying reference obligations, reference obligation credit ratings and the CVA applied against Ambac Assurance liabilities by market participants. Notional balances, expected remaining term and reference obligation credit ratings are monitored and determined by Ambac’s Risk Management group. Fair values of the underlying reference obligations are obtained from broker quotes when available or are estimated internally using the same methodologies used to value Ambac’s fixed income securities in its investment portfolio. Ambac reflects changes in reference obligation credit ratings within the fair value of its CDS contracts by changing the percentage of the obligation's market spread (over LIBOR) that would be captured as a CDS fee at the valuation date. We adjust this percentage (“relative change ratio”) in our valuations based on internal rating changes such that the resulting fair value liability of the CDS contract, excluding the effect of Ambac's own credit risk, will increase up to the full amount of the unrealized loss on the reference obligation as the credit rating declines. Ambac incorporates its own credit risk into the valuation of its CDS liabilities by applying a CVA to the calculations described above. The Ambac CVA represents the difference between the present value of the hypothetical fees discounted at LIBOR compared to discount rates that incorporate Ambac credit risk. Information about the above described model inputs used to determine the fair value of credit derivatives, including the CVA as a percentage of the gross mark-to-market liability before considering Ambac credit risk (“CVA percentage”), as of December 31, 2017 and 2016 is summarized below: December 31, Number of CDS transactions Notional outstanding Weighted average reference obligation price Weighted average life (WAL) in years Weighted average credit rating Weighted average relative change ratio CVA percentage Fair value of derivative liabilities 2017 2016 2 $ 325,890 $ 99.3 6.5 A 23.6% 9.64% 8 737,380 93.5 5.2 A- 31.6% 11.14% $ 566 $ 15,349 The maximum potential amount of future payments under Ambac’s credit derivative contracts is generally the notional outstanding amount included in the above table plus future interest payments by the derivative reference obligations. Since Ambac’s credit derivatives typically reference obligations of or assets held by special purpose entities that meet the definition of a VIE, the amount of maximum potential future payments for credit derivatives is included in the table in Note 3. Special Purpose Entities, Including Variable Interest Entities. Changes in fair value are recorded in “Net change in fair value of credit derivatives” on the Consolidated Statements of Total Comprehensive Income (Loss). Although CDS contracts are accounted for at fair value, they are surveilled similar to non-derivative financial guarantee contracts. As with financial guarantee insurance policies, Ambac’s Risk Management group tracks credit migration of CDS contracts’ reference obligations from period to period. Credits are assigned risk classifications by the Risk Management group. As of December 31, 2017, there | Ambac Financial Group, Inc. 121 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) are no CDS contracts on Ambac’s adversely classified credit listing. As of December 31, 2016, there were two CDS contracts on Ambac’s adversely classified credit listing, with a net derivative liability fair value of $6,123 and total notional outstanding of $67,783. Significant unobservable inputs for credit derivatives include WAL, internal credit rating, relative change ratio and CVA percentage. A longer (shorter) WAL, lower (higher) reference obligation credit rating, higher (lower) relative change ratio or lower (higher) CVA, in isolation, would result in an increase (decrease) in the fair value liability measurement. A change in an internal credit rating of a reference obligation in our model will generally result in a directionally opposite change in the relative change ratio. Also, a shorter (longer) WAL will generally correspond with a lower (higher) CVA percentage. Financial Guarantees: Fair value of net financial guarantees written represents our estimate of the cost to Ambac to completely transfer its insurance obligation to another market participant of comparable credit worthiness. In theory, this amount should be the same amount that another market participant of comparable credit worthiness would hypothetically charge in the market place, on a present value basis, to provide the same protection as of the balance sheet date. This fair value estimate of financial guarantees is presented on a net basis and includes direct and assumed contracts written, net of ceded reinsurance contracts. The fair value estimate of financial guarantees is computed by utilizing cash flows calculated at the policy level. For direct and assumed contracts, net cash flows for each policy includes future: (i) installment premium receipts, (ii) gross claim payments, (iii) subrogation receipts, and (iv) unpaid claims on claims presented and not yet paid for policies allocated to the Segregated Account, including Deferred Amounts and interest thereon. The timing of future claim payments of the Segregated Account was at the sole discretion of the Rehabilitator until the Segregated Account rehabilitation was concluded on February 12, 2018. For ceded reinsurance contracts, net cash flows for each policy includes future: (i) installment ceded premium payments, (ii) ceding commission receipts, (iii) ceded claim receipts, and (iv) ceded subrogation payments. For each assumed,or ceded reinsurance contract, the respective undiscounted cash flow components are aggregated to determine if we are in a net asset or net liability position. U.S. GAAP requires that the nonperformance risk of a financial liability be included in the estimation of fair value, which includes considering Ambac Assurance’s own credit risk. Accordingly, for each contract in a net liability position, we estimate the fair value using internally developed discount rates and market pricing that incorporate Ambac’s own credit risk and subsequently apply a profit margin. This profit margin represents what another market participant would require to assume the financial guarantee contracts. A profit margin was developed based on discussions with the third-party institutions with valuation expertise, discussions with industry participants and yields on Ambac Assurance surplus notes. The discount rates used for contracts in a net liability position are derived from the rates implicit in the fair value of surplus notes and guaranteed securities with future cash flows that are highly dependent upon Ambac financial guarantee payments. For each contract in a net asset position, we estimate the fair value using a discount rate that is commensurate with a hypothetical buyer’s cost of capital. This methodology is based on management’s expectations of how a market participant would estimate net cash flows. We are aware of a number of factors that may cause such fair or exit value to differ, perhaps materially. For example, (i) since no financial guarantor with Ambac Assurance’s credit quality is writing or otherwise obtaining financial guarantee business (e.g. reinsurance or novation of policies from other insurers) we do not have access to observable pricing data points and (ii) certain segments of Ambac's financial guarantees were allocated to the Segregated Account and timing of the payments of such liabilities were at the sole discretion of the Rehabilitator. Long-term Debt: Long-term debt includes surplus notes issued by Ambac Assurance, surplus notes issued by the Segregated Account of Ambac Assurance, which became obligations of Ambac Assurance when the Rehabilitation Exit Transactions were effectuated on February 12, 2018, and notes outstanding to third parties arising from Ambac Assurance's secured borrowing transaction. The fair values of Ambac Assurance surplus notes and the secured borrowing notes are based on market prices received from dealer quotes or alternative pricing sources with reasonable levels of price transparency. The fair value of Segregated Account surplus notes were classified as Level 3 and are internally estimated considering market transactions when available and internally developed discounted cash flow models. Internal valuation estimates of Segregated Account surplus notes considered differences in contractual accrued interest and seniority of payment relative to Ambac Assurance surplus notes. Other Financial Assets and Liabilities: The fair values of Ambac’s equity interest in Ambac sponsored special purpose entities (included in Other assets), Loans, and Obligations under investment agreements are estimated based upon internal valuation models that discount expected cash flows using discount rates consistent with the credit quality of the obligor after considering collateralization. Variable Interest Entity Assets and Liabilities: The financial assets and liabilities of VIEs consolidated under the Consolidation Topic of the ASC consist primarily of fixed income securities, loans, derivative and debt instruments and are generally carried at fair value. These consolidated VIEs are securitization entities which have liabilities and/or assets guaranteed by Ambac Assurance. The fair values of VIE debt instruments are determined using the same methodologies used to value Ambac’s fixed income securities in its investment portfolio as described above. VIE debt fair value is based on market prices received from dealer quotes or alternative pricing sources with reasonable levels of price transparency. Such quotes are considered Level 2 and generally consider a variety of factors, including recent trades of the same and similar securities. For those VIE debt instruments where | Ambac Financial Group, Inc. 122 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) quotes were not available, the debt instrument fair values are considered Level 3 and are based on internal discounted cash flow models. Comparable to the sensitivities of investments in fixed income securities described above, longer (shorter) expected maturities or higher (lower) yields used in the valuation model will, in isolation, result in decreases (increases) in fair value liability measurement for VIE debt. VIE debt instruments considered Level 3 include fixed rate, floating rate and zero coupon notes secured by various asset types, primarily European ABS. Information about the valuation inputs for the various VIE debt categories classified as Level 3 is as follows: European ABS transactions: The fair value of such obligations classified as Level 3 was $2,757,688 and $2,551,278 at December 31, 2017 and 2016, respectively. Fair values were calculated by using a discounted cash flow approach. The discount rates used were based on the rates implied from the third party quoted values for comparable notes from the same securitization entity. Significant inputs for the valuation at December 31, 2017 and 2016 include the following weighted averages: December 31, 2017 a. Coupon rate: 0.40% b. Maturity: 15.28 years c. Yield: 4.82% December 31, 2016 a. Coupon rate: 0.46% b. Maturity: 16.16 years c. Yield: 4.95% US Commercial ABS transaction: The fair value of such obligations classified as Level 3 was $0 and $30,942 at December 31, 2017 and 2016, respectively. Fair values were calculated as the sum of the present value of expected future cash flows from the underlying VIE assets plus the present value of the related Ambac financial guarantee cash flows. The discount rates applied to cash flows sourced from VIE assets were based on interest rates for similar obligations. The fair value of financial guarantee cash flows include internal estimates of future loss payments by Ambac, when applicable, discounted at a rate that incorporates Ambac’s own credit risk. As a result of a negotiated settlement to refinance this Ambac-insured debt, the final paydown of the bond occurred in October 2017. Significant inputs for the valuation at December 31, 2016, include the following weighted averages: December 31, 2016 a. Coupon rate: 5.88% b. Maturity: 20.85 years c. Yield: 5.86% VIE derivative asset and liability fair values are determined using valuation models. When specific derivative contractual terms are available and may be valued primarily by reference to interest rates, foreign exchange rates and yield curves that are observable and regularly quoted, the derivatives are valued using vendor-developed models. Other derivatives within the VIEs that include significant unobservable valuation inputs are valued using internally developed models. VIE derivative fair value balances at December 31, 2017 and 2016 were developed using vendor-developed models and do not use significant unobservable inputs. The fair value of VIE assets are obtained from market quotes when available. Typically VIE asset fair values are not readily available from market quotes and are estimated internally. The consolidated VIEs are securitization entities in which net cash flows from assets and derivatives (after adjusting for financial guarantor cash flows and other expenses) will be paid out to note holders or equity interests. Our valuation of VIE assets (fixed income securities or loans), therefore, are derived from the fair value of notes and derivatives, as described above, adjusted for the fair value of cash flows from Ambac’s financial guarantee. The fair value of financial guarantee cash flows include: (i) estimated future premiums discounted at a rate consistent with that implicit in the fair value of the VIE’s liabilities and (ii) internal estimates of future loss payments by Ambac discounted at a rate that includes Ambac’s own credit risk. Estimated future premium payments to be paid by the VIEs were discounted at a weighted average rate of 3.1% and 3.6% at December 31, 2017 and 2016, respectively. The value of future loss payments to be paid by Ambac to the VIEs was adjusted to include an Ambac CVA appropriate for the term of expected Ambac claim payments. Additional Fair Value Information for Financial Assets and Liabilities Accounted for at Fair Value: The following tables present the changes in the Level 3 fair value category for the periods presented in 2017, 2016 and 2015. Ambac classifies financial instruments in Level 3 of the fair value hierarchy when there is reliance on at least one significant unobservable input to the valuation model. In addition to these unobservable inputs, the valuation models for Level 3 financial instruments typically also rely on a number of inputs that are readily observable either directly or indirectly. Thus, the gains and losses presented below include changes in the fair value related to both observable and unobservable inputs. | Ambac Financial Group, Inc. 123 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Level-3 Financial Assets and Liabilities Accounted for at Fair Value Year Ended December 31, 2017 Investments Other Assets Derivatives Investments Loans Long-term Debt Total Balance, beginning of period $ 762,703 $ 7,382 $ (100,282) $ 2,622,566 $ 10,658,963 $ (2,582,220) $ 11,369,112 VIE Assets and Liabilities Total gains/(losses) realized and unrealized: Included in earnings 65,195 (1,403) 62,847 70,928 550,021 35,009 782,597 Included in other comprehensive income Purchases Sales Settlements Transfers into Level 3 Transfers out of Level 3 Deconsolidation of VIEs Balance, end of period The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date 6,392 35,781 (79,319) (29,963) 47,768 — — — — — — — — — — — — 253,429 1,004,284 (254,093) 1,010,012 — — — — — — 35,781 (79,319) 98,243 (32,778) (683,884) 43,616 (604,766) — — — — — — — — — — — — 47,768 — — $ 808,557 $ 5,979 $ 60,808 $ 2,914,145 $ 11,529,384 $ (2,757,688) $ 12,561,185 $ — $ (1,403) $ 8,913 $ 70,928 $ 547,004 $ 36,851 $ 662,293 Level-3 Financial Assets and Liabilities Accounted for at Fair Value Year Ended December 31, 2016 Investments Other Assets Derivatives Investments Loans Long-term Debt Total Balance, beginning of period $ 488,884 $ 8,696 $ (99,192) $ 2,588,556 $ 11,690,324 $ (3,180,170) $ 11,497,098 VIE Assets and Liabilities Total gains/(losses) realized and unrealized: Included in earnings 54,600 (1,314) (15,374) 508,873 1,166,898 (842,748) 870,935 Included in other comprehensive income Purchases Sales Settlements Transfers into Level 3 Transfers out of Level 3 Deconsolidations of VIEs Balance, end of period The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date 40,518 99,018 — (28,682) 108,365 — — — — — — — — — — — — 14,284 — — — (474,863) (1,944,821) 486,218 (1,892,948) — — — — — — — — — — (253,438) 216,582 — — — — 737,898 — 99,018 — (51,254) 108,365 737,898 — $ 762,703 $ 7,382 $ (100,282) $ 2,622,566 $ 10,658,963 $ (2,582,220) $ 11,369,112 $ — $ (1,314) $ (16,351) $ 508,873 $ 1,166,898 $ (842,748) $ 815,358 | Ambac Financial Group, Inc. 124 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Level-3 Financial Assets and Liabilities Accounted for at Fair Value Year Ended December 31, 2015 Investments Other Assets Derivatives Investments Loans Long-term Debt Total Balance, beginning of period $ 198,201 $ 12,036 $ (215,346) $ 2,743,050 $ 12,371,177 $ (1,263,664) $ 13,845,454 VIE Assets and Liabilities Total gains/(losses) realized and unrealized: Included in earnings 30,083 (1,635) 16,571 (7,263) 569,617 (1,152,681) (545,308) Included in other comprehensive income Purchases Sales Settlements Transfers into Level 3 Transfers out of Level 3 Deconsolidation of VIEs Balance, end of period The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date (73,559) 359,193 — — — — (25,034) (1,705) — — — — — — — — — 11,365 88,218 — — (147,231) (612,941) 93,812 (739,919) — — — — — — — — (312,406) — — (325,123) — — (17,085) (840,552) — — 359,193 — (344,865) (752,334) — (325,123) $ 488,884 $ 8,696 $ (99,192) $ 2,588,556 $ 11,690,324 $ (3,180,170) $ 11,497,098 $ — $ (1,635) $ (25,980) $ (7,263) $ 589,634 $ (1,161,991) $ (607,235) The tables below provide roll-forward information by class of investments and derivatives measured using significant unobservable inputs. Level-3 Investments by Class Year Ended December 31, Balance, beginning of period Total gains/(losses) realized and unrealized: Included in earnings Included in other comprehensive income Purchases Sales Settlements Transfers into Level 3 Transfers out of Level 3 Balance, end of period The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date Other asset backed securities 2017 Non- Agency RMBS Total investments Other asset backed securities 2016 Non- Agency RMBS Total investments $ 65,990 $ 696,713 $ 762,703 $ — $ 488,884 $ 488,884 1,433 6,130 — — (1,013) — — 63,762 262 35,781 (79,319) (28,950) 47,768 — 65,195 6,392 35,781 (79,319) (29,963) 47,768 — 1,908 (5,597) — — (1,028) 70,707 — 52,692 46,115 99,018 — (27,654) 37,658 — 54,600 40,518 99,018 — (28,682) 108,365 — 72,540 $ 736,017 $ 808,557 $ 65,990 $ 696,713 $ 762,703 — $ — $ — $ — $ — $ — $ $ | Ambac Financial Group, Inc. 125 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Level-3 Investments by Class Year Ended December 31, 2015 Balance, beginning of period Total gains/(losses) realized and unrealized: Included in earnings Included in other comprehensive income Purchases Sales Settlements Transfers into Level 3 Transfers out of Level 3 Balance, end of period The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date 2015 Other asset backed securities Corporate obligations Non- Agency RMBS Total investments $ — $ 3,808 $ 194,393 $ 198,201 — — — — — — — (19) (286) — — 30,102 (73,273) 359,193 — 30,083 (73,559) 359,193 — (3,503) (21,531) (25,034) — — — — — — $ $ — $ — $ 488,884 $ 488,884 — $ — $ — $ — Level-3 Derivatives by Class Year Ended December 31, Balance, beginning of period Total gains/(losses) realized and unrealized: 2017 2016 Interest rate swaps Credit derivatives Total derivatives Interest rate swaps Credit derivatives Total derivatives $ (84,933) $ (15,349) $ (100,282) $ (64,649) $ (34,543) $ (99,192) Included in earnings 46,475 16,372 62,847 (35,480) 20,106 (15,374) Included in other comprehensive income Purchases Sales Settlements Transfers into Level 3 Transfers out of Level 3 Balance, end of period The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date $ $ — — — — — — — — — — — — — — — — — — 99,832 (1,589) 98,243 15,196 (912) 14,284 — — — — — — — — — — — — 61,374 $ (566) $ 60,808 $ (84,933) $ (15,349) $ (100,282) 6,716 $ 2,197 $ 8,913 $ (35,480) $ 19,129 $ (16,351) | Ambac Financial Group, Inc. 126 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Level-3 Derivatives by Class Year Ended December 31, Balance, beginning of period Total gains/(losses) realized and unrealized: Included in earnings Included in other comprehensive income Purchases Sales Settlements Transfers into Level 3 Transfers out of Level 3 Balance, end of period The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date 2015 Interest rate swaps Credit derivatives Total derivatives $ (141,887) $ (73,459) $ (215,346) (25,130) 41,701 16,571 — — — 14,150 88,218 — — — — (2,785) — — — — — 11,365 88,218 — $ $ (64,649) $ (34,543) $ (99,192) (25,130) $ (850) $ (25,980) Invested assets and VIE long-term debt are transferred into Level 3 when internal valuation models that include significant unobservable inputs are used to estimate fair value. All such securities that have internally modeled fair values have been classified as Level 3. Non-agency RMBS securities transferred into Level 3 in 2017 consist of an Ambac-insured re-REMIC collateralized by distressed mortgage-backed securities and certain Ambac-insured RMBS for which projected cash flows consist solely of Deferred Amounts and interest thereon. Non-agency RMBS transferred into Level 3 in 2016 consist of certain investments in Ambac-wrapped RMBS securities for which projected cash flows consist solely of Deferred Amounts and interest thereon. Other asset-backed securities transferred into Level 3 in 2016 consist of a subordinated tranche of a resecuritization collateralized by Ambac-insured military housing bonds. These invested assets were internally valued as management could not corroborate the reasonableness of third party quotes. Derivative instruments are transferred into Level 3 when the use of unobservable inputs becomes significant to the overall valuation. Derivative instruments transferred into Level 3 in 2015 consisted of certain interest rate swap assets with counterparty credit adjustments. There were no transfers between Level 1 and Level 2 for the periods presented. All transfers between fair value hierarchy Levels 1, 2, and 3 are recognized at the beginning of each accounting period. Gains and losses (realized and unrealized) relating to Level 3 assets and liabilities included in earnings for the affected periods are reported as follows: Realized gains or (losses) and other settlements on credit derivative contracts Unrealized gains or (losses) on credit derivative contracts Net investment income Interest rate swaps Income (loss) on variable interest entities Other income or (loss) Year Ended December 31, 2017 Total gains or losses included in earnings for the period 65,195 1,589 14,783 46,475 655,956 (1,403) Changes in unrealized gains or losses relating to the assets and liabilities still held at the reporting date — — 2,197 6,716 654,783 (1,403) Year Ended December 31, 2016 Total gains or losses included in earnings for the period $ 54,600 $ 912 $ 19,194 $ (35,480) $ 833,023 $ (1,314) Changes in unrealized gains or losses relating to the assets and liabilities still held at the reporting date — — 19,129 (35,480) 833,023 (1,314) Year Ended December 31, 2015 Total gains or losses included in earnings for the period $ 30,083 $ 2,785 $ 38,916 $ (25,130) $ (590,327) $ (1,635) Changes in unrealized gains or losses relating to the assets and liabilities still held at the reporting date — — (850) (25,130) (579,620) (1,635) | Ambac Financial Group, Inc. 127 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) 10. INVESTMENTS Ambac’s non-VIE invested assets are primarily comprised of fixed income securities classified as available-for-sale and equity interests in pooled investment funds. Such equity interests in the form of common stock or in-substance common stock are classified as trading securities and are reported within Other investments on the Consolidated Balance Sheets. Other investments also include Ambac's interests in an unconsolidated trust created in connection with its sale of Segregated Account junior surplus notes on August 28, 2014. The amortized cost and estimated fair value of available-for-sale investments, excluding VIE investments, at December 31, 2017 and 2016 were as follows: Amortized cost Gross unrealized gains Gross unrealized losses Estimated fair value Non-Credit Other- than- temporary Impairments (1) December 31, 2017 Fixed income securities: Municipal obligations Corporate obligations Foreign obligations U.S. government obligations Residential mortgage-backed securities Collateralized debt obligations Other asset-backed securities Short-term Fixed income securities pledged as collateral: U.S. government obligations Total collateralized investments $ 845,778 $ 3,456 $ 69,400 $ 779,834 $ 858,774 26,245 86,900 2,214,512 50,754 531,660 4,614,623 557,476 5,172,099 99,719 99,719 6,772 409 261 67,303 283 66,899 145,383 3 145,386 — — — — — — 5,471 111 1,753 860,075 26,543 85,408 30,482 2,251,333 23,832 — 617 107,834 209 108,043 — — 51,037 597,942 4,652,172 557,270 5,209,442 99,719 99,719 — — 23,832 — 23,832 — — Total available-for-sale investments $ 5,271,818 $ 145,386 $ 108,043 $ 5,309,161 $ 23,832 December 31, 2016 Fixed income securities: Municipal obligations Corporate obligations Foreign obligations U.S. government obligations U.S. agency obligations Residential mortgage-backed securities Collateralized debt obligations Other asset-backed securities Short-term Fixed income securities pledged as collateral: U.S. government obligations Total collateralized investments $ 376,064 $ 5,509 $ 7,205 $ 374,368 $ 1,803,136 41,932 33,732 4,063 2,284,425 113,650 778,383 5,435,385 430,827 5,866,212 64,833 64,833 19,589 1,303 2,551 — 110,955 493 58,028 198,428 5 198,433 72 72 20,560 1,802,165 100 97 3 43,785 220 7,628 79,598 44 79,642 — — 43,135 36,186 4,060 2,351,595 113,923 828,783 5,554,215 430,788 5,985,003 64,905 64,905 — — — — — 35,232 — — 35,232 — 35,232 — — Total available-for-sale investments $ 5,931,045 $ 198,505 $ 79,642 $ 6,049,908 $ 35,232 (1) Represents the amount of non-credit other-than-temporary impairment losses remaining in accumulated other comprehensive income on securities that also had a credit impairment. These losses are included in gross unrealized losses as of December 31, 2017 and 2016. | Ambac Financial Group, Inc. 128 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) The amortized cost and estimated fair value of available-for-sale investments, excluding VIE investments, at December 31, 2017, by contractual maturity, were as follows: Due in one year or less Due after one year through five years Due after five years through ten years Due after ten years Residential mortgage-backed securities Collateralized debt obligations Other asset-backed securities Total Amortized Cost Estimated Fair Value $ 714,761 $ 556,370 376,420 827,341 2,474,892 2,214,512 50,754 531,660 714,507 556,387 376,686 761,269 2,408,849 2,251,333 51,037 597,942 $ 5,271,818 $ 5,309,161 Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay certain obligations with or without call or prepayment penalties. Unrealized Losses on Fixed Income Securities: The following table shows gross unrealized losses and fair values of Ambac’s available-for-sale investments, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, at December 31, 2017 and 2016: Less Than 12 Months 12 Months or More Total Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss December 31, 2017 Fixed income securities: Municipal obligations Corporate obligations Foreign obligations U.S. government obligations Residential mortgage-backed securities Other asset-backed securities Short-term Total temporarily impaired securities $ 667,335 $ 68,578 $ 32,525 $ 822 $ 699,860 $ 69,400 292,028 8,122 74,188 668,524 26,655 1,736,852 251,926 3,377 81 1,653 12,524 58 86,271 209 87,272 1,700 5,525 418,617 88,023 633,662 — 2,094 30 100 17,958 559 21,563 — 379,300 9,822 79,713 1,087,141 114,678 2,370,514 251,926 5,471 111 1,753 30,482 617 107,834 209 $ 1,988,778 $ 86,480 $ 633,662 $ 21,563 $ 2,622,440 $ 108,043 | Ambac Financial Group, Inc. 129 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) December 31, 2016 Fixed income securities: Municipal obligations Corporate obligations Foreign obligations U.S. government obligations U.S. agency obligations Residential mortgage-backed securities Collateralized debt obligations Other asset-backed securities Short-term Total temporarily impaired securities Less Than 12 Months 12 Months or More Total Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss Fair Value Gross Unrealized Loss $ 98,147 $ 2,045 $ 122,928 $ 5,160 $ 221,075 $ 963,513 20,232 5,063 6,037 4,060 226,889 6,986 115,622 1,426,317 65,176 100 93 3 7,201 23 203 29,900 44 6,492 — 5,045 — 550,807 25,780 77,712 788,764 — 328 — 4 — 36,584 197 7,425 49,698 — 970,005 5,063 11,082 4,060 777,696 32,766 193,334 2,215,081 65,176 7,205 20,560 100 97 3 43,785 220 7,628 79,598 44 $ 1,491,493 $ 29,944 $ 788,764 $ 49,698 $ 2,280,257 $ 79,642 Management has determined that the unrealized losses reflected in the tables above are temporary in nature as of December 31, 2017 and 2016 based upon (i) no unexpected principal and interest payment defaults on these securities; (ii) analysis of the creditworthiness of the issuer and financial guarantor, as applicable, and analysis of projected defaults on the underlying collateral; (iii) management has no intent to sell these investments in debt securities; and (iv) it is not more likely than not that Ambac will be required to sell these debt securities before the anticipated recovery of its amortized cost basis. The assessment under (iv) is based on a comparison of future available liquidity from the investment portfolio against the projected net cash outflow from operating activities and debt service. For purposes of this assessment, available liquidity from the investment portfolio is comprised of the fair value of securities for which management has asserted its intent to sell, the fair value of other securities that are available for sale and in an unrealized gain position, trading securities plus the scheduled maturities and interest payments from the remaining securities in the portfolio. To the extent that securities that management intends to sell are in an unrealized loss position, they would have already been considered other-than-temporarily impaired with the amortized cost written down to fair value. Because the above-described assessment indicates that future available liquidity exceeds projected net cash outflow, it is not more likely than not that we would be required to sell securities in an unrealized loss position before the recovery of their amortized cost basis. In the liquidity assessment described above, principal payments on securities pledged as collateral are not considered to be available for other liquidity needs until the collateralized positions are projected to be settled. Projected interest receipts on securities pledged as collateral generally belong to Ambac and are considered to be sources of available liquidity from the investment portfolio. As of December 31, 2017, for securities that have indications of possible other-than-temporary impairment but which management does not intend to sell and will not more likely than not be required to sell, management compared the present value of cash flows expected to be collected to the amortized cost basis of the securities to assess whether the amortized cost will be recovered. Cash flows were discounted at the effective interest rate implicit in the security at the date of acquisition (or Fresh Start Reporting Date of April 30, 2013 for securities purchased prior to that date) or for debt securities that are beneficial interests in securitized financial assets, at a rate equal to the current yield used to accrete the beneficial interest. For floating rate securities, future cash flows and the discount rate used were both adjusted to reflect changes in the index rate applicable to each security as of the evaluation date. Of the securities that were in a gross unrealized loss position at December 31, 2017, $1,855,694 of the total fair value and $100,503 of the unrealized loss related to below investment grade and non-rated securities. Of the securities that were in a gross unrealized loss position at December 31, 2016, $890,952 of the total fair value and $53,273 of the unrealized loss related to below investment grade and non-rated securities. As discussed further below, most of the securities in a gross unrealized loss position that are below investment grade or non-rated are guaranteed by Ambac Assurance. Ambac’s assessment about whether a decline in value is other-than-temporary reflects management’s current judgment regarding facts and circumstances specific to a security and the factors noted above. If that judgment changes, Ambac may ultimately record a charge for other-than-temporary impairment in future periods. Municipal obligations The gross unrealized losses on municipal obligations as of December 31, 2017 are primarily the result of the price declines on Ambac-insured Puerto Rico bonds, especially Puerto Rico Sales Tax Financing Corporation's Senior Sales Tax Revenue bonds. These bonds are below investment grade, long-dated zero coupon securities subject to higher than average price volatility that suffered additional downward price movement in late 2017 following the hurricanes that impacted Puerto Rico. Management has the ability and intent to hold these bonds and by virtue of the Ambac financial guarantee, believes that it is probable that all amounts due on the bonds will be paid timely and in full. | Ambac Financial Group, Inc. 130 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Corporate obligations The gross unrealized losses on corporate obligations as of December 31, 2016 and to a lesser extent at December 31, 2017 resulted from an increase in interest rates since purchase (or the Fresh Start Reporting Date of April 30, 2013 if owned as of that date). These securities are primarily fixed-rate securities with an investment grade credit rating. Management believes that the timely receipt of all principal and interest on these positions is probable. Residential mortgage-backed securities Of the $30,482 of unrealized losses on residential mortgage-backed securities, $30,482 is attributable to Ambac insured securities. The unrealized loss on these securities is primarily the result of discount accretion, which has exceeded the increase in fair value since either the purchase date or Fresh Start Reporting Date of April 30, 2013 for securities owned prior to such date. As part of the quarterly impairment review process, management estimates expected future cash flows from residential mortgage-backed securities. This approach includes the utilization of market accepted software models in conjunction with detailed data of the historical performance of the collateral pools, which assists in the determination of assumptions such as defaults, severity and voluntary prepayment rates that are largely driven by home price forecasts as well as other macro-economic factors. Additionally, for Ambac insured securities that were allocated to the Segregated Account, expected future cash flows included assumptions about the timing and amount of Ambac Assurance claim payments, including interest on Deferred Amounts, although the actual timing of such payments were at the sole discretion of the Rehabilitator. These assumptions are used to project future cash flows for each security and at December 31, 2017 incorporate the 6.5% discount on the settlement of Deferred Amounts as part of the Rehabilitation Exit Transactions described in Note 1. Management considered this analysis in making our determination that a credit loss has not occurred at December 31, 2017 on these transactions. Realized Gains and Losses and Other-Than-Temporary Impairments: The following table details amounts included in net realized gains (losses) and other-than-temporary impairments included in earnings for the affected periods: Year Ended December 31, Gross realized gains on securities Gross realized losses on securities Foreign exchange (losses) gains Net realized gains Net other-than-temporary impairments (1) 2017 2016 2015 29,080 $ 17,344 $ (18,945) (4,769) (8,239) 30,179 5,366 $ 39,284 $ (20,171) $ (21,819) $ 58,218 (10,558) 5,816 53,476 (25,659) $ $ $ (1) Other-than-temporary impairments exclude impairment amounts recorded in other comprehensive income under ASC Paragraph 320-10-65-1, which comprise non-credit related amounts on securities that are credit impaired but which management does not intend to sell and it is not more likely than not that the company will be required to sell before recovery of the amortized cost basis. Since commencement of the Segregated Account Rehabilitation Proceedings, changes in the estimated timing of claim payments have resulted in adverse changes in projected cash flows on certain impaired Ambac insured securities. Such changes in estimated claim payments on Ambac insured securities contributed to net other-than-temporary impairments for the periods presented in the table above. Future changes in our estimated liquidity needs could result in a determination that Ambac no longer has the ability to hold securities that are in an unrealized loss position, which could result in additional other-than-temporary impairment charges. The following table presents a roll-forward of Ambac’s cumulative credit losses on debt securities held as of December 31, 2017 and 2016 for which a portion of an other-than-temporary impairment was recognized in other comprehensive income: Year Ended December 31, Balance, beginning of period Additions for credit impairments recognized on: Securities not previously impaired Securities previously impaired Balance, end of period 2017 2016 2015 52,070 $ 31,176 $ 14,062 3,310 11,705 3,572 17,322 67,085 $ 52,070 $ 10,900 6,214 31,176 $ $ Counterparty Collateral, Deposits with Regulators and Other Restrictions: Ambac routinely pledges and receives collateral related to certain transactions. Ambac pledges cash and securities it holds in its investment portfolio to investment agreement (prior to repayment in March 2017) and derivative counterparties, as collateral. Securities pledged to investment agreement counterparties were not to be re-pledged to another entity. Ambac’s counterparties under derivative agreements have the right to pledge or rehypothecate the securities and as such, these pledged securities are separately classified on the Consolidated Balance Sheets as “Fixed income securities pledged as collateral, at fair value”. | Ambac Financial Group, Inc. 131 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) The following table presents collateral owned by Ambac that was pledged to investment agreement and derivative counterparties at December 31, 2017 and 2016: December 31, 2017: Pledged cash and securities owned by Ambac December 31, 2016: Pledged cash and securities owned by Ambac Fair value of cash and securities pledged to investment agreement counterparties Fair value of cash and securities pledged to derivative counterparties Fair value of cash and underlying securities 120,645 $ — $ 120,645 291,545 $ 88,940 $ 202,605 $ $ Securities carried at $5,974 and $5,872 at December 31, 2017 and 2016, respectively, were deposited by Ambac Assurance and Everspan with governmental authorities or designated custodian banks as required by laws affecting insurance companies. Securities with fair value of $346,212 and $360,759 at December 31, 2017 and 2016, respectively, were held by a bankruptcy remote trust to collateralize and fund repayment of debt issued through a securitization transaction. The securities may not be sold or repledged by the trust. These assets are held and the secured debt is issued by entities that qualify as VIEs and are consolidated in Ambac’s consolidated financial statements. Refer to Note 3. Special Purpose Entities, Including Variable Interest Entities for a further description of this transaction. Guaranteed Securities: Ambac’s fixed income portfolio includes securities covered by guarantees issued by Ambac Assurance and other financial guarantors (“insured securities”). The published rating agency ratings on these securities reflect the higher of the financial strength rating of the financial guarantor or the rating of the underlying issuer. Rating agencies do not always publish separate underlying ratings (those ratings excluding the insurance by the financial guarantor). In the event these underlying ratings are not available from the rating agencies, Ambac will assign an internal rating. The following table represents the fair value, including the value of the financial guarantee, and weighted-average underlying rating, excluding the financial guarantee, of the insured securities at December 31, 2017 and 2016, respectively: Municipal obligations Corporate obligations Mortgage and asset- backed securities Weighted Average Underlying Rating (1) Total December 31, 2017: Ambac Assurance Corporation (2) National Public Finance Guarantee Corporation Assured Guaranty Municipal Corporation Total December 31, 2016: Ambac Assurance Corporation (2) National Public Finance Guarantee Corporation Assured Guaranty Municipal Corporation MBIA Insurance Corporation Total $ $ $ $ 706,715 $ 32,660 $ 2,702,887 $ 3,442,262 20,733 5,998 — — — — 20,733 5,998 733,446 $ 32,660 $ 2,702,887 $ 3,468,993 81,651 $ — $ 2,739,073 $ 2,820,724 38,687 25,660 — — — 2,630 — — — 38,687 25,660 2,630 145,998 $ 2,630 $ 2,739,073 $ 2,887,701 CC BBB- BBB+ CC CC A- AA BBB+ CC (1) Ratings are based on the lower of Standard & Poor’s or Moody’s rating. If unavailable, Ambac’s internal rating is used. (2) Includes corporate obligations and asset-backed securities with a fair value of $170,280 and $118,813 at December 31, 2017 and 2016, respectively, insured by Ambac UK. | Ambac Financial Group, Inc. 132 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Equity Interests: Ambac's investment portfolio includes equity interests in various pooled investment funds, which are classified as trading. The fair value and additional information about such investments in pooled funds, by investment type, is summarized in the table below. Except as noted in the table, fair value reported is determined using NAV per share as a practical expedient. There are no unfunded commitments applicable to any of these investments for the periods disclosed. Class of Funds Real estate properties (1) Diversified hedge fund strategies (2) Interest rate products (3) (7) Illiquid investments (4) Insurance-linked investments (5) Equity market investments (6) (7) December 31, 2017 December 31, 2016 Redemption frequency Redemption notice period $ 33,154 $ 33,303 quarterly 53,054 136,603 67,787 22,666 53,675 10 business days 15 - 30 days 53,985 semi-monthly 261,315 daily, weekly or monthly 0 - 30 days 39,068 quarterly — quarterly 32,633 daily 180 days 90-120 days 0 days Total equity investments in pooled funds $ 366,939 $ 420,304 (1) Investments consist of UK property to generate income and capital growth. (2) Investments seek diversified exposure to hedge fund core strategies to produce high risk-adjusted returns, with low long-term correlation to traditional markets and with targeted volatility levels. Funds may have the right to defer redemptions under certain circumstances. (3) This class of funds includes investments in a range of instruments including leveraged loans, CLOs, asset-backed securities and floating rate notes to generate income and capital appreciation. Funds with less frequent redemption periods limit redemptions to as little as 15% per period. Funds with a same day redemption notice period are redeemable only weekly, while funds that may be redeemed any business day have notice periods of 15-30 days. (4) This class seeks to obtain high long-term total return through investments with low liquidity and defined term, resulting in expected capital distributions to subscribers between 2020 and 2023. Redemptions cannot occur prior to the expiration of the investment lock-up period in May 2018. (5) This class aims to provide returns from the insurance and reinsurance markets through investments in catastrophe bonds, life insurance and other insurance linked investments. Redemption periods are quarterly, subject to 90-day notice for January/July redemption dates and 120-day notice for April/October redemption dates with redemptions greater than 3.5% during the first five years following share issuance subject to redemption fees. (6) Investments represent a diversified exposure to global equity market returns through holdings of various regional market index funds. (7) Interest rate products include $2,823 at December 31, 2017 and $51,158 at December 31, 2016 and equity market investments include $53,675 at December 31, 2017 and $32,633 at December 31, 2016 that have readily determinable fair. Ambac also holds interests in an unconsolidated trust created in connection with the 2014 sale of Segregated Account junior surplus notes. The investment in debt securities is accounted for as trading and the equity interest is accounted for under the equity method and included in Other Investments on the Consolidated Balance Sheets. Investment Income: Net investment income was comprised of the following for the affected periods: Year Ended December 31, Fixed income securities Short-term investments Loans Investment expense Securities available-for-sale and short-term Other investments Total net investment income 2017 2016 2015 $ 337,454 $ 288,554 $ 257,404 7,898 520 (8,098) 337,774 23,179 1,505 337 (9,347) 281,049 32,318 $ 360,953 $ 313,367 $ 299 420 (8,786) 249,337 16,952 266,289 Net investment income from Other investments primarily represents changes in fair value on securities classified as trading or under the fair value option plus, income from Ambac's interests in an unconsolidated trust created in connection with its sale of Segregated Account junior surplus notes. The portion of net unrealized gains (losses) related to trading securities still held at the end of each period is as follows: Year Ended December 31, Net gains (losses) recognized during the period on trading securities Less: net gains (losses) recognized during the reporting period on trading securities sold during the period Unrealized gains (losses) recognized during the reporting period on trading securities still held at the reporting date $ $ 2017 2016 2015 18,242 $ 27,654 $ 12,615 4,854 7,474 13,388 $ 20,180 $ 4,966 7,649 | Ambac Financial Group, Inc. 133 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) 11. DERIVATIVE INSTRUMENTS The following tables summarize the gross fair values of individual derivative instruments and the impact of legal rights of offset as reported in the Consolidated Balance Sheets as of December 31, 2017 and 2016. December 31, 2017: Derivative Assets: Interest rate swaps Total non-VIE derivative assets Derivative Liabilities: Credit derivatives Interest rate swaps Futures contracts Total non-VIE derivative liabilities Variable Interest Entities Derivative Assets: Currency swaps Total VIE derivative assets Variable Interest Entities Derivative Liabilities: Interest rate swaps Total VIE derivative liabilities December 31, 2016: Derivative Assets: Interest rate swaps Futures contracts Total non-VIE derivative assets Derivative Liabilities: Credit derivatives Interest rate swaps Total non-VIE derivative liabilities Variable Interest Entities Derivative Assets: Currency swaps Total VIE derivative assets Variable Interest Entities Derivative Liabilities: Interest rate swaps Total VIE derivative liabilities Gross amounts of recognized assets / liabilities Gross amounts offset in the consolidated balance sheet Net amounts of assets/ liabilities presented in the consolidated balance sheet Gross amount of collateral received / pledged not offset in the consolidated balance sheet Net amount $ $ 73,826 73,826 566 81,495 1,348 627 627 $ — $ 627 — $ $ 73,199 73,199 566 80,868 1,348 — — $ — $ 79,912 1,348 73,199 73,199 566 956 — 83,409 $ 627 $ 82,782 $ 81,260 $ 1,522 54,877 54,877 2,205,264 2,205,264 139,045 536 139,581 15,349 365,776 381,125 80,407 80,407 2,078,601 2,078,601 $ $ $ $ $ $ $ $ $ $ $ — — $ 54,877 54,877 — $ — $ 2,205,264 2,205,264 61,839 — 61,839 $ $ — $ 61,839 61,839 $ 77,206 536 77,742 15,349 303,937 319,286 — $ — $ 80,407 80,407 — $ — $ 2,078,601 2,078,601 $ $ $ $ $ $ $ $ $ $ $ — — $ 54,877 54,877 — $ — $ 2,205,264 2,205,264 — $ — — $ — $ 156,925 156,925 $ 77,206 536 77,742 15,349 147,012 162,361 — $ — $ 80,407 80,407 — $ — $ 2,078,601 2,078,601 $ $ $ $ $ $ $ $ $ $ $ $ $ $ Effective January 3, 2017, the central clearing party ("CCP") for certain of Ambac's derivative contracts changed its rules governing the character of variation payments. Under the new CCP rules, variation payments are considered settlements of the associated derivative balance. Prior to the rule change such variation payments were considered to be margin and were not offset against the fair value of the derivatives, but were recognized as collateral receivable or payable. The amount of variation margin included within "Other assets" on the Consolidated Balance Sheet as of December 31, 2016, and was applied as a reduction to derivative liabilities effective January 3, 2017 under the new CCP rules is $71,023. Amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral are not offset against fair value amounts recognized for derivative instruments on the Consolidated Balance Sheets. The amounts representing the right to reclaim cash collateral and posted margin, recorded in “Other assets” were $20,926 and $137,701 as of December 31, 2017 and 2016, respectively. There were no amounts held representing an obligation to return cash collateral as of December 31, 2017 and 2016. The following tables summarize the location and amount of gains and losses of derivative contracts in the Consolidated Statements of Total Comprehensive Income (Loss) for the year ended December 31, 2017 and 2016: | Ambac Financial Group, Inc. 134 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Location of gain (loss) recognized in Consolidated Statements of Total Comprehensive Income (Loss) Amount of gain (loss) recognized in Consolidated Statement of Total Comprehensive Income (Loss) – Year Ended December 31, 2017 2016 2015 Net change in fair value of credit derivatives $ 16,372 $ 20,106 $ 41,701 Net gains (losses) on interest rate derivatives Net gains (losses) on interest rate derivatives Income (loss) on variable interest entities Income (loss) on variable interest entities 48,870 10,695 59,565 (25,530) (126,664) (152,194) (50,082) (191) (50,273) 58,990 (574,554) (515,564) $ (76,257) $ (545,731) $ (41,177) (1,367) (42,544) 103,757 168,003 271,760 270,917 Non-VIEs: Credit derivatives Non VIE derivatives: Interest rate swaps Futures contracts Total non-VIE derivatives Variable Interest Entities: Currency swaps Interest rate swaps Total Variable Interest Entities Total derivative contracts Credit Derivatives: Credit derivatives, which are privately negotiated contracts, provide the counterparty with credit protection against the occurrence of a specific event such as a payment default or bankruptcy relating to an underlying obligation. Credit derivatives issued are insured by Ambac Assurance. None of the outstanding credit derivative transactions at December 31, 2017 include ratings based collateral-posting triggers or otherwise require Ambac to post collateral regardless of Ambac’s ratings or the size of the mark to market exposure to Ambac. The portfolio of our credit derivatives were written on a “pay-as-you-go” basis. Similar to an insurance policy execution, pay-as-you-go provides that Ambac pays interest shortfalls on the referenced transaction as they are incurred on each scheduled payment date, but only pays principal shortfalls upon the earlier of (i) the date on which the assets designated to fund the referenced obligation have been disposed of and (ii) the legal final maturity date of the referenced obligation. Ambac maintains internal credit ratings on its guaranteed obligations, including credit derivative contracts, solely to indicate management’s view of the underlying credit quality of the guaranteed obligations. Independent rating agencies may have assigned different ratings on the credits in Ambac’s portfolio than Ambac’s internal ratings. The following summarizes the gross principal notional outstanding for CDS contracts, by Ambac rating as of December 31, 2017 and 2016: Ambac Rating December 31, AAA AA A BBB (1) Below investment grade (2) Total 2017 2016 — $ 175,765 — 150,125 — 325,890 $ — 315,201 227,146 127,250 67,783 737,380 $ $ (1) BBB internal ratings reflect bonds which are of medium grade credit quality with adequate capacity to pay interest and repay principal. Certain protective elements and margins may weaken under adverse economic conditions and changing circumstances. These bonds are more likely than higher rated bonds to exhibit unreliable protection levels over all cycles. (2) Below investment grade internal ratings reflect bonds which are of speculative grade credit quality with the adequacy of future margin levels for payment of interest and repayment of principal potentially adversely affected by major ongoing uncertainties or exposure to adverse conditions. Interest Rate Derivatives: Ambac, through its subsidiary Ambac Financial Services (“AFS”), provides interest rate swaps to counterparties and as of December 31, 2017 and 2016 the notional amounts of its derivatives are as follows: Type of derivative Interest rate swaps—receive-fixed/pay-variable Interest rate swaps—pay-fixed/receive-variable US Treasury futures contracts—short Notional - December 31, 2017 2016 $ 379,497 $ 1,428,264 1,655,000 973,130 1,874,678 195,000 | Ambac Financial Group, Inc. 135 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) On June 27, 2017, Ambac entered into a termination agreement with various parties, including Augusta, in connection with the commutation of interest rate swaps between Augusta and AFS. Ambac paid $94,407 under the termination agreement and reported a gain on the Augusta swaps of $43,443. Derivatives of Consolidated Variable Interest Entities Certain VIEs consolidated under the Consolidation Topic of the ASC entered into derivative contracts to meet specified purposes within the securitization structure. The notional for VIE derivatives outstanding as of December 31, 2017 and 2016 are as follows: Type of VIE derivative Interest rate swaps—receive-fixed/pay-variable Interest rate swaps—pay-fixed/receive-variable Currency swaps Credit derivatives Notional - December 31, 2017 2016 $ 1,483,491 $ 2,479,244 394,541 12,100 1,352,010 2,300,584 312,357 12,059 Contingent Features in Derivatives Related to Ambac Credit Risk Ambac’s over-the-counter interest rate swaps are centrally cleared when eligible. Certain interest rate swaps remain with professional swap- dealer counterparties and certain front-end counterparties. These non-cleared swaps are generally executed under standardized derivative documents including collateral support and master netting agreements. Under these agreements, Ambac is required to post collateral in the event net unrealized losses exceed predetermined threshold levels. Additionally, given that Ambac Assurance is no longer rated by an independent rating agency, counterparties have the right to terminate the swap positions. As of December 31, 2017 and 2016, the net liability fair value of derivative instruments with contingent features linked to Ambac’s own credit risk was $79,912 and $82,944, respectively, related to which Ambac had posted cash and securities as collateral with a fair value of $111,391 and $128,754, respectively. All such ratings-based contingent features have been triggered as requiring maximum collateral levels to be posted by Ambac while preserving counterparties’ rights to terminate the contracts. Assuming all such contracts terminated on December 31, 2017, settlement of collateral balances and net derivative liabilities would result in a net receipt of cash and/or securities by Ambac. If counterparties elect to exercise their right to terminate, the actual termination payment amounts will be determined in accordance with derivative contract terms, which may result in amounts that differ from market values as reported in Ambac’s financial statements. 12. LOANS Loans had been extended: (i) by VIEs which are consolidated by Ambac under ASC Topic 810 as a result of Ambac’s financial guarantees of the VIEs’ note liabilities and/or assets and (ii) to certain institutions in connection with various transactions. Loans by consolidated VIEs are generally carried at fair value on the Consolidated Balance Sheets. See Note 3. Special Purpose Entities, Including Variable Interest Entities for further information about VIEs for which the assets and liabilities are carried at fair value. Other loans had an outstanding principal balance of $20,184 and $4,873 at December 31, 2017 and 2016, respectively. The interest rate on these loans ranged from 0.00% to 4.58% at December 31, 2017 and were 4.53% December 31, 2016. The maturity date of these loans ranged from June 2026 to December 2046 as of December 31, 2017 and were June 2026 as of December 31, 2016. Collectability of these loans is evaluated on an ongoing basis; no loan has been considered impaired and as such no loan impairments have been recorded as of December 31, 2017 and 2016. 13. LONG-TERM DEBT The carrying value of long-term debt was as follows: December 31, Ambac Assurance: 5.1% surplus notes, general account, due 2020 5.1% surplus notes, segregated account, due 2020 5.1% junior surplus notes, segregated account, due 2020 Secured borrowing Ambac Assurance long-term debt Variable Interest Entities long-term debt 2017 2016 $ $ $ 668,667 $ — 249,036 73,993 991,696 12,160,544 $ $ 730,648 33,107 248,247 102,403 1,114,405 11,155,936 | Ambac Financial Group, Inc. 136 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Surplus Notes, General Account Ambac Assurance surplus notes, with a par amount of $754,811 and $862,945 at December 31, 2017 and 2016, respectively, are reported in long-term debt on the Consolidated Balance Sheet and have a scheduled maturity of June 7, 2020. In 2017 and 2016, Ambac purchased $108,134 and $11,804 par amount of these surplus notes, respectively. The gains on these repurchases were $3,603 and $1,677, and recognized in Net realized gains (losses) on extinguishment of debt of the Consolidated Statements of Total Comprehensive Income for the years ended December 31, 2017 and 2016, respectively. These surplus notes were issued in connection with the Settlement Agreement and were recorded at their fair value at the date of issuance. The discount on these notes is currently being accreted into income using the effective interest method at an imputed interest rate of of 10.5%. All payments of principal and interest on these surplus notes are subject to the prior approval of the OCI. If the OCI does not approve the payment of interest on these surplus notes, such interest will accrue and compound annually until paid. OCI disapproved the requests of Ambac Assurance to pay interest on the outstanding Ambac Assurance surplus notes on their respective scheduled interest payment dates since their issuance. Surplus Notes, Segregated Account The Segregated Account surplus notes, with a par amount of $0 and $39,102 at December 31, 2017 and 2016, respectively, are reported in long-term debt on the Consolidated Balance Sheets and have a scheduled maturity of June 7, 2020. In 2017, Ambac purchased $39,102 par amount of these surplus notes. The gains on these repurchases were $212 and recognized in Net realized gains (losses) on extinguishment of debt of the Consolidated Statements of Total Comprehensive Income. These surplus notes were recorded at their fair value at the date of issuance. The discount on these notes was being accreted into income using the effective interest method at an imputed interest rate of 10.5%. All payments of principal and interest on the these surplus notes are subject to the prior approval of the OCI. If the OCI does not approve the payment of interest on these surplus notes, such interest will accrue and compound annually until paid. OCI disapproved of the requests of the Rehabilitator of the Segregated Account, acting for and on behalf of the Segregated Account, to pay interest on the outstanding Segregated Account surplus notes on their respective scheduled interest payment dates since their issuance. Pursuant to the Second Amended Plan of Rehabilitation, Ambac Assurance became the obligor under the Segregated Account surplus notes as of February 12, 2018. Junior Surplus Notes, Segregated Account The Segregated Account junior surplus notes, with a par value of $370,237 and $374,036 at December 31, 2017 and 2016, respectively, are reported in long-term debt on the Consolidated Balance Sheets and have a scheduled maturity of June 7, 2020, subject to the following restrictions. Pursuant to the Second Amended Plan of Rehabilitation, Ambac Assurance became the obligor under the junior surplus notes as of February 12, 2018. Principal and interest payments on these junior surplus notes cannot be made until all Ambac Assurance surplus notes (other than junior surplus notes) are paid in full and after all of Ambac Assurance's future and existing senior indebtedness, policy and other priority claims have been paid in full. All payments of principal and interest on these junior surplus notes are subject to the prior approval of the OCI. If the OCI does not approve the payment of interest on the junior surplus notes, such interest will accrue and compound annually until paid. No such approval has been sought or obtained to pay interest on junior surplus notes since their issuance. • • Par value at December 31, 2017 and 2016 includes $20,237 and $24,037, respectively, of junior surplus notes issued in connection with a settlement agreement (the “OSS Settlement Agreement”) entered into among Ambac, Ambac Assurance, the Segregated Account and One State Street, LLC (“OSS”) with respect to the termination of Ambac’s office lease with OSS. Part of these junior surplus notes ($13,056 par value) will be reduced periodically as rent payments are made by Ambac Assurance beginning in January 2016. Par value of these junior surplus notes have been reduced by $3,799 and $4,002 during 2017 and 2016, respectively, as rent payments were made by Ambac Assurance. These junior surplus notes were recorded at their fair value at the dates of issuance. The discount on these notes are currently being accreted into income using the effective interest method at an imputed interest rate of 19.5%. Par value at December 31, 2017 and 2016 includes $350,000 face amount of a junior surplus note originally issued to Ambac pursuant to Ambac's Reorganization Plan in accordance with the Mediation Agreement dated September 21, 2011 among Ambac, Ambac Assurance, the Segregated Account, the Rehabilitator, the OCI and the Official Committee of Unsecured Creditors of Ambac, and that Ambac sold to a Trust on August 28, 2014. This junior surplus note was recorded at a discount to par based on its fair value on August 28, 2014. Ambac is accreting the discount on this junior surplus note into earnings using the effective interest method, based on an imputed interest rate of 8.4%. Secured Borrowing The secured borrowing, with a par value of $73,993 and $102,986 at December 31, 2017 and 2016, respectively, is reported in long-term debt on the Consolidated Balance Sheets and has a legal maturity of July 25, 2047. Interest on the secured borrowing is payable monthly at an annual rate of one month LIBOR + 2.8%. Refer to Note 3. Special Purpose Entities, Including Variable Interest Entities for further discussion on the secured borrowing transaction. | Ambac Financial Group, Inc. 137 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Variable Interest Entities, Long-term Debt The variable interest entity notes were issued by consolidated VIEs. Ambac is the primary beneficiary of the VIEs as a result of providing financial guarantees on certain of the the variable interest obligations. Consequently, Ambac has consolidated these variable interest entity notes and all other assets and liabilities of the VIEs. Ambac is not primarily liable for the debt obligations of these entities. Ambac would only be required to make payments on these debt obligations in the event that the issuer defaults on any principal or interest due and to the extent such obligations are guaranteed by Ambac. The total unpaid principal amount of outstanding long-term debt associated with VIEs consolidated as a result of the financial guarantee provided by Ambac was $9,387,884 and $8,854,530 as of December 31, 2017 and 2016, respectively. The range of final maturity dates of the outstanding long-term debt associated with these VIEs is November 2018 to December 2047 as of December 31, 2017 and 2016. As of December 31, 2017 and 2016, the interest rates on these VIEs’ long-term debt ranged from 0.96% to 8.35% and from 0.82% to 13.00%, respectively. Final maturities of VIE long-term debt for each of the five years following December 31, 2017 are as follows: 2018-$141,327; 2019-$307,915; 2020-$44,100; 2021-$94,024; 2022-$0. 14. INCOME TAXES Ambac files a consolidated U.S. Federal income tax return with its subsidiaries. Ambac and its subsidiaries also file separate or combined income tax returns in various states, local and foreign jurisdictions. The following are the major jurisdictions in which Ambac and its subsidiaries operate and the earliest tax years subject to examination: Jurisdiction United States New York State New York City United Kingdom Italy Tax Year 2010 2013 2014 2014 2013 On December 22, 2017, H.R. 1. (commonly referred to as the Tax Cut and Jobs Act or "TCJA") was enacted and significantly changed the tax code effective January 1, 2018. We incorporated the effects of the TCJA in our current and deferred tax evaluation for the year ended December 31, 2017. Given the complexity of the TCJA and the limited time between its enactment and the filing of year-end financial statements, the SEC issued guidance (SAB 118), which provides a one-year measurement period for companies to finalize the accounting for the impact of the TCJA. Ambac has recorded the income tax effect of those aspects of the TCJA for which the accounting is completed and recorded provisional amounts for those aspects for which the accounting is incomplete. In connection with our preliminary analysis of the TCJA, Ambac recorded an estimated discrete current benefit of $29,581 (net of an estimated 6.6% Congressional budget sequestration haircut) related to the repeal of the Alternative Minimum Tax ("AMT") and deferred taxes of $31,418 attributable to Ambac UK, including the effect of the TCJA changes relating to unrealized gains on investments, resulting in an estimated net cost of $1,886. The AMT credit will be refunded in installments through 2021 or sooner based upon taxable income. Ambac has not completed its accounting analysis of the TCJA's impact on moving to a new quasi-territorial worldwide tax system, the primary effect of which is a mandatory repatriation of Ambac UK's historical earnings. Accordingly, the provisions related to these international tax changes have been recorded as estimates. Ambac has also not completed the accounting analysis on provisions related to executive compensation and, therefore, recorded these amounts as estimates. As of December 31, 2017 Ambac had U.S. federal net operating loss tax carryforwards of approximately $3,694,844, which, if not utilized, will begin expiring in 2029, and will fully expire in 2032. | Ambac Financial Group, Inc. 138 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) The tax effects of temporary differences that give rise to significant portions of the deferred tax liabilities and deferred tax assets at December 31, 2017 and 2016 are presented below: December 31, Deferred tax liabilities: Insurance intangible Variable interest entities Investments Unearned premiums and credit fees Unremitted foreign earnings Other Total deferred tax liabilities Deferred tax assets: Net operating loss and capital carryforward Loss reserves Compensation AMT Credits Other Subtotal deferred tax assets Valuation allowance Total deferred tax assets Net deferred tax (liability) 2017 2016 $ 177,864 $ 336,728 22,817 28,798 51,485 — 9,402 46,343 38,656 68,682 30,699 4,276 290,366 525,384 775,917 236,237 5,585 — 2,140 1,019,879 763,172 256,707 (33,659) 1,409,565 224,553 4,759 31,532 11,967 1,682,376 1,158,712 523,664 (1,720) In accordance with the Income Tax Topic of the ASC, a valuation allowance is recognized if, based on the weight of available evidence, it is more-likely-than-not that some, or all, of the deferred tax asset will not be realized. With respect to Ambac's domestic subsidiaries subject to U.S. tax, as a result of the risks and uncertainties associated with future operating results, management believes it is more likely than not that the Company will not generate sufficient taxable income to recover the deferred tax operating asset and therefore maintains a full valuation allowance. The remaining net deferred tax liability of $33,659 is attributable to Ambac U.K. U.S. and foreign components of pre-tax income (loss) were as follows: Year Ended December 31, U.S. Foreign Total The components of the provision (benefit) for income taxes were as follows: Year Ended December 31, Current taxes U. S. federal U.S. state and local Foreign Current taxes Deferred taxes Deferred taxes - foreign Provision for income taxes 2017 2016 2015 (450,978) $ 166,727 (284,251) $ 77,161 27,865 105,026 $ $ 337,753 172,305 510,058 2017 2016 2015 (29,581) $ 3,934 $ 16,893 2,013 40,613 13,045 707 26,088 30,729 31,419 44,464 $ (20) 30,709 $ 182 2 17,077 287 17,364 $ $ $ $ | Ambac Financial Group, Inc. 139 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) The total effect of income taxes on net income and stockholders’ equity for the years ended December 31, 2017, 2016 and 2015 is as follows: Year Ended December 31, Total income taxes charged to net income Income taxes charged (credited) to stockholders’ equity: Unrealized gains (losses) on investment securities Unrealized gains (losses) on foreign currency translations Change in retirement benefits Valuation allowance to equity Total effect of income taxes 2017 2016 2015 44,464 $ 30,709 $ 17,364 (30,838) 25,776 446 4,616 41,602 (58,527) 3,278 13,647 44,464 $ 30,709 $ (55,906) (15,628) (240) 71,774 17,364 $ $ The tax provisions in the accompanying Consolidated Statements of Total Comprehensive Loss reflect effective tax rates differing from prevailing Federal corporate income tax rates. The following is a reconciliation of these differences: Year Ended December 31, Amount % Amount % Amount % Tax on income from continuing operations at statutory rate $ (99,488) 35.0 % $ 36,759 35.0 % $ 178,521 35.0 % 2017 2016 2015 Changes in expected tax resulting from: Tax-exempt interest Goodwill impairment Foreign taxes Substantiation adjustment Valuation allowance Change in Tax Law Other, net (6,004) — (17,742) 36,124 127,675 1,886 2,013 2.1 % — % 6.2 % (12.7 )% (44.9 )% (0.7 )% (0.7 )% (1,561) — 26,183 (171,687) 139,584 — 1,431 (1.5)% — % 24.9 % (163.5)% 132.9 % — % 1.4 % (1,454) 180,079 288 — (0.3)% 35.3 % 0.1 % — % (340,133) (66.7)% — 63 Tax expense on income from continuing operations $ 44,464 (15.6)% $ 30,709 29.2 % $ 17,364 A reconciliation of the beginning and ending amount of unrecognized tax benefits for 2017, 2016 and 2015 is as follows: Year Ended December 31, Balance, beginning of period Increases related to prior year tax positions Decreases related to prior year tax positions Balance, end of period 2017 2016 2015 $ $ — $ — — — $ — $ — — — $ — % — % 3.4 % — — — — Included in these balances at December 31, 2017, 2016 and 2015 are $0, $0 and $0, respectively, of unrecognized tax benefits that, if recognized, would affect the effective tax rate. During the years ended December 31, 2017, 2016 and 2015, Ambac recognized interest of approximately $0, $0 and $0, respectively. Ambac had approximately $0, $0 and $0, for the payment of interest accrued at December 31, 2017, 2016 and 2015, respectively. NOL Usage Pursuant to the amended and restated tax sharing agreement among Ambac, Ambac Assurance and certain affiliates (the “Amended TSA"), to the extent Ambac Assurance generates taxable income after September 30, 2011, which is offset with "Allocated NOLs" of $3,650,000, it is obligated to make payments (“Tolling Payments”), subject to certain credits, to Ambac in accordance with the following NOL usage table, where the “Applicable Percentage” is applied to the aggregate amount of federal income tax liability that would have been paid if the Allocated NOLs were not available. Pursuant to the Closing Agreement between Ambac and the Internal Revenue Service ("IRS"), the IRS will receive 12.5% of Tier C and 17.5% of Tier D payments, if made. | Ambac Financial Group, Inc. 140 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) NOL Usage Table NOL Usage Tier A B C D Allocated NOLs The first $479,000 The next $1,057,000 after Tier A The next $1,057,000 after Tier B The next $1,057,000 after Tier C Applicable Percentage 15% 40% 10% 15% Any post determination date NOLs generated by Ambac Assurance are utilized prior to any Allocated NOLs for which Tolling Payments will be due. Ambac Assurance utilized all of its current post determination date NOLs generated from September 30, 2011 through December 31, 2017, generating cumulative taxable income of $1,367,795. Of the bankruptcy related credits available to offset the first $5,000 of payments due under each of the NOL usage Tiers A, B, and C, Ambac Assurance has fully utilized the combined $10,000 of Tier A and Tier B credits. For the two years ended December 31, 2016, Ambac Assurance utilized all of the $479,000 Tier A NOL and $607,124 of the $1,057,000 Tier B NOL resulting in Tolling Payments , net of applicable credits, of $100,145, of which $71,454 was paid to Ambac in 2016 and $28,691 was paid in 2017. During the year ended December 31, 2017, Ambac Assurance recorded additional estimated Tolling Payments of $31,133, which includes $637 of additional tolling resulting from the filing Ambac's 2016 tax return that was paid in December 2017. The balance of $30,496 will be paid to Ambac in May 2018. Beginning on the fifth anniversary date subsequent to Ambac's May 1, 2013, emergence from bankruptcy, and subject to Ambac's consent, not to be unreasonably withheld, to the extent Ambac Assurance generates post-determination date income in excess of the $3,650,000, Allocated NOLs, Ambac Assurance may utilize the remaining NOLs, previously reserved for usage by Ambac, in exchange for a payment of 25% of the federal income tax liability that Ambac Assurance would have been paid had Ambac's NOLs not been available. After Ambac fully utilizes its Allocated NOLs it may utilize Ambac Assurance's then remaining Allocated NOLs in exchange for a payment of 50% of the federal income tax liability that Ambac would have paid had Ambac Assurance's NOL not been available. As of December 31, 2017, the remaining balance of the $3,650,000 NOL allocated to Ambac Assurance was $2,282,205. As of December 31, 2017 Ambac's NOL was $1,412,639. 15. EMPLOYMENT BENEFIT PLANS Postretirement Health Care and Other Benefits: Ambac provides postretirement and postemployment / severance benefits, including health and life benefits for certain employees who meet certain age and service requirements. None of the plans are currently funded. Postretirement and postemployment benefits expenses, including severance benefits paid, was $4,164, $8,846 and $2,570 for the years ended December 31, 2017, 2016 and 2015, respectively. Effective August 1, 2005, new employees were not eligible for postretirement benefits. The current postretirement benefit requires retirees to purchase their own medical insurance policy with a portion of their premium being reimbursed by Ambac. The unfunded accumulated postretirement benefit obligation was $7,820 as of December 31, 2017. The assumed health care cost trend rates range from 5.6% in 2018, decreasing ratably to 4.5% in 2025. Increasing the assumed health care cost trend rate by one percentage point in each future year would increase the accumulated postretirement benefit obligation at December 31, 2017, by $182 and the 2017 benefit expense by $11. Decreasing the assumed health care cost trend rate by one percentage point in each future year would decrease the accumulated postretirement benefit obligation at December 31, 2017 by $258 and the 2017 benefit expense by $17. The following table sets forth projected benefit payments from Ambac’s postretirement plan over the next ten years for current retirees: 2018 2019 2020 2021 2022 2023-2027 Total $ 282 $ 311 $ 327 $ 353 $ 387 $ 2,452 $ 4,112 The discount rate used in determining the projected benefit obligations for the postretirement plan is selected by reference to the year-end Citigroup pension liability index with similar duration to that of the benefit plan. The rates used for the projected plan benefit obligations at the measurement date for December 31, 2017 and 2016 were 3.50% and 4.00%, respectively. Savings Incentive Plan: Substantially all employees of Ambac Assurance are covered by a defined contribution plan (the “Savings Incentive Plan”). Ambac Assurance makes employer matching contributions equal 100% of the employees’ contributions, up to 3% of such participants’ compensation, as defined in the plan, plus 50% of contributions up to an additional 2% of compensation, subject to limits set by the Internal Revenue Code. The total cost of the Savings Incentive Plan was $691, $911 and $1,042 for the years December 31, 2017, 2016 and 2015, respectively. | Ambac Financial Group, Inc. 141 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Incentive Compensation - Stock Units and Cash: Incentive compensation is a key component of our compensation strategy. Our incentive compensation awards generally have two components: short term incentive compensation or annual bonuses and long term incentive plan awards. Annual decisions with regard to incentive compensation are generally made in the first quarter of each year and are based on Company performance and individual and business unit performance of the previous year. For all employees, an allocation of incentive compensation is made between annual bonuses and LTIP awards. Beginning for the 2016 performance year, the annual bonus was settled via cash and vested restricted stock units for certain employees. Employees, directors and consultants of Ambac are eligible to participate in Ambac’s 2013 Incentive Compensation Plan (“2013 Plan”) subject to the discretion of the compensation committee of Ambac’s Board of Directors. The 2013 Plan provides for incentives and rewards that are valued or determined by reference to Ambac common stock as traded on the NASDAQ exchange. There are 4,000,000 shares of Ambac’s common stock authorized for awards under the 2013 Plan of which 2,793,323 shares are available for future grant as of December 31, 2017. In March 2014, Ambac developed a long term incentive compensation plan (“LTIP”) as a sub-plan of the 2013 Plan. The LTIP is intended to be an annual program that allows for both cash and equity performance awards to certain US employees. Beginning with grants issued in 2017, the entire LTIP award was issued as equity performance awards to employees. In 2015, Ambac UK 's Board of Directors adopted a long term incentive plan which provides cash based performance awards to Ambac UK employees. Cash based compensation expense related to performance awards granted to Ambac UK employees was $2,159, $283 and $253 for the years ended December 31, 2017, 2016 and 2015, respectively. The amount of stock-based compensation expense and corresponding after-tax expense are as follows: Year Ended December 31, Stock options Restricted stock units Performance awards (2) (3) Total stock-based compensation Total stock-based compensation (after-tax) 2017 (1) 2016 2015 — $ — $ 1,640 2,653 4,293 4,293 $ $ 3,463 1,790 5,253 5,194 $ $ 956 1,257 892 3,105 3,105 $ $ $ (1) As discussed in Note 2. Basis of Presentation and Significant Accounting Policies , we adopted ASU 2016-09 as of January 1, 2017. One of the provisions of this ASU requires entities to make an accounting policy election with respect to forfeitures of share-based payment awards. We elected to account for forfeitures as they occur and adopted this provision of ASU 2016-09 using a modified retrospective approach resulting in recording a cumulative-effect adjustment to equity of $137. (2) Represents expense related to performance stock units portion of performance awards. Certain performance awards are split evenly between performance stock units and cash. Cash based compensation expense related to performance awards granted to US employees was $1,565, $1,790 and $892 for the years ended December 31, 2017, 2016 and 2015, respectively. (3) A performance award issued to Ambac's former Chief Executive Officer in the form of performance stock units has yet to be expensed given the performance conditions have not been met. Stock Options: Stock options were awarded to the former Chief Executive Officer in 2015 (vested January 1, 2016), with an expiry term of seven years from the grant date, subject to earlier expiration upon the recipient's departure from the Company. The Company intends to use Treasury shares first and then, if necessary, issue new shares to satisfy stock option exercises. No stock options were awarded in 2016 or 2017. The Black-Scholes-Merton model was used to estimate the fair value of the service condition based stock options on the grant date. The following assumptions were used in estimating the fair value of options awarded in 2015: Year Ended December 31, Risk-free interest rate Expected volatility Dividend yield Expected life Weighted-average grant-date fair value per share 2015 1.283% 42.8% 0.0% 4.13 years $ 8.69 The expected volatility is based on implied volatilities from traded options on Ambac’s stock, the historical volatility of Ambac’s stock and the historical volatilities of our peer industry group. Peer group historical volatilities were considered due to the fact that Ambac stock had been traded for a time period less than the expected life of the options. A zero dividend yield was assumed based on the uncertainty of Ambac making dividend payments over the expected life of these options. The risk-free interest rate reflects the U.S. Treasury yield curve in effect | Ambac Financial Group, Inc. 142 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) at the time of the grant. The expected life represents the period of time that options granted are expected to be outstanding and is based on certain factors we believe will influence exercise behavior. A summary of option activity for 2017 is as follows: Year Ended December 31, 2017 Outstanding at beginning of period Granted Exercised Forfeited or expired Outstanding at end of period Exercisable Shares Weighted Average Exercise Price Aggregate Intrinsic Value Weighted Average Remaining Contractual Life ( in years) 143,334 $ — — (16,667) 126,667 126,667 $ $ 23.64 — — 20.63 24.03 24.03 $ $ — — 1.23 1.23 All stock options granted were fully vested as of December 31, 2017. Total unrecognized compensation costs related to unvested stock options granted were $0 as of December 31, 2017. No stock options were exercised during the years ended December 31, 2017, 2016 and 2015, respectively. Restricted Stock Units (“RSUs”): RSUs were awarded to employees in 2013 that vested in two installments, 50% on the grant date and 50% on the first anniversary of the grant date. These RSU awards provided for accelerated vesting upon change in control or death or disability. These employee RSUs settled and converted into Ambac shares upon the earlier of (a) the employee’s termination of employment (other than for cause) and (b) the second anniversary of the applicable vesting date. In 2015 and 2016, RSU awards were granted to the former Chief Executive Officer. The 2015 award would vest in three equal installments on January 1, 2016, 2017 and 2018, with certain accelerated vesting features. The 2016 award would vest in three equal installments on December 31, 2016, 2017 and 2018. The former Chief Executive Officer departed the Company in 2016 and pursuant to the terms set forth in his settlement agreements and the RSU award agreements, (i) the service requirement for the entire 2015 award was met and the entire RSU award vested in 2016 and (ii) the service requirement for one-third of the 2016 RSU award was met and vested in 2016 with the remaining two-thirds of the 2016 RSU award forfeited. In 2016, RSU awards were granted to certain Executive Officers. The awards vest in three equal installments on February 21, 2017, 2018 and 2019 ("Time-Based RSUs"). The vesting of the Time-Based RSUs are expressly conditioned upon the respective Executive's continued service with Ambac through the applicable vesting date. In 2017, RSU awards were granted to certain employees as consideration for a portion of their annual bonus. These awards vest upon grant, but settlement, other than for employment tax withholdings, occurs in two equal installments on March 2, 2018 and 2019, or upon termination if earlier. RSUs are awarded annually to directors that vest on the last day of April of the following year. These RSUs will not settle until the respective director’s termination from the board of directors or, if earlier, upon a change in control. All RSUs provide for accelerated vesting upon a change in control, death or disability or involuntary removal other than for cause (not including removal pursuant to a shareholder vote at a regularly scheduled annual meeting of shareholders). Upon termination (other than for cause), the RSUs shall vest as of the date of such termination in an amount equal to the number of then outstanding RSUs multiplied by a fraction, the numerator of which shall be the number of calendar days which have lapsed since the grant date and the denominator of which shall be the total number of calendar days of the original vesting period. As of December 31, 2017, 221,803 RSUs remained outstanding, of which (i) 68,654 units required future service as a condition to the delivery of the underlying shares of common stock and (ii) 153,149 units did not require future service and are deferred for future settlement. As of December 31, 2016, 264,230 RSUs remained outstanding, of which (i) 102,794 units required future service as a condition to the delivery of the underlying shares of common stock, (ii) 103,486 units vested on December 31, 2016 but were not settled until January 3, 2017 and (ii) 57,950 units did not require future service and are deferred for future settlement. | Ambac Financial Group, Inc. 143 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) A summary of RSU activity for 2017 is as follows: Outstanding at beginning of period Granted Delivered or returned to plan (1) Forfeited Outstanding at end of period Shares Weighted Average Grant Date Fair Value 264,230 $ 70,432 (112,859) — 221,803 $ 16.47 20.22 13.96 — 18.93 (1) When restricted stock unit awards issued by Ambac become taxable compensation to employees, shares may be withheld to cover the employee’s withholding taxes. For the year ended December 31, 2017, Ambac purchased 56,410 of shares from employees that settled restricted stock units to meet the required tax withholdings. Ambac’s closing share price on the grant date was used to estimate the fair value of the service condition based RSU on the grant date. The weighted average grant date fair value of RSUs granted during 2017, 2016 and 2015 was $20.22, $14.34 and $23.71, respectively. As of December 31, 2017, there was $478 of total unrecognized compensation costs related to unvested RSUs granted. These costs are expected to be recognized over a weighted average period of 0.6 years. The fair value for RSUs vested and delivered during the year ended December 31, 2017, 2016 and 2015 was $2,536, $2,965 and $864, respectively. Performance Stock Awards ("PSUs"): Performance awards granted vest in 3 years and actual awards will be based on performance at both Ambac and Ambac Assurance. Actual awards can payout 0% to 200% of the number of units granted. Ambac performance will be evaluated relative to cumulative earnings before interest, taxes, depreciation and amortization over the vesting period (exclusive of Ambac Assurance and its subsidiaries' earnings), which is intended to reward participants on generating pre-tax income. Over the same period, Ambac Assurance performance will be evaluated according to changes in a ratio or value of Ambac Assurance's assets relative to its insurance and financial obligations, which is intended to reward participants for increases in the relative value of Ambac Assurance. Other than voluntary termination or involuntary termination for cause, and provided that a participant's employment with the Company is not terminated within the first year of the performance period (reduced to six months for the 2016 and 2017 grants to employees other than executive officers), the performance awards shall partially vest as of the date of such termination in the proportion of the number of calendar days which have lapsed since the grant date and the denominator of which shall be the total number of calendar days of the original vesting period. Settlements of the 2015 and 2016 performance awards shall be within 60 days after the end of the performance period, including those with a partial vesting. The 2017 performance awards shall be within 75 days after the end of the performance period, including those with a partial vesting. In 2015, a performance award was granted to the former Chief Executive Officer. This award will vest on February 12, 2018 upon the emergence of the Segregated Account from rehabilitation. A summary of PSU activity for 2017 is as follows: Outstanding at beginning of period Granted (1) Delivered (2) Forfeited (1) Performance adjustment (3) Outstanding at end of period Shares Weighted Average Grant Date Fair Value 227,073 $ 153,317 (38,464) (26,378) 7,395 322,943 $ 21.29 22.35 29.78 20.26 29.78 21.06 (1) Represents performance share units at 100% of units granted for LTIP Awards. (2) Reflects the number of performance shares attributable to the performance goals attained over the completed performance period and for which service conditions have been met. (3) Represents the increase (decrease) in shares issued for awards granted in 2014 based upon the attainment of performance metrics at the end of the performance period. As of December 31, 2017 there was $3,523 of total unrecognized compensation costs related to the PSU portion of unvested performance awards, which are expected to be recognized over a weighted average period of 1.6 years. | Ambac Financial Group, Inc. 144 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) 16. COMMITMENTS AND CONTINGENCIES Ambac is responsible for leases on the rental of office space. The executive office of Ambac is located in New York City under a lease agreement that was modified and extended in 2015 to allow Ambac to remain in the same office space through September 2019 and on one floor through the end of 2029, with an option to continue to occupy other currently leased floors through the end of 2029. Rent payments under this lease made through September 2019 will result in the periodic reduction of junior surplus notes that were previously issued to the landlord, beginning in January 2016. Ambac leases additional space for its data center, disaster recovery site and for its international location under lease agreements that expire periodically through October 2020. An estimate of future net minimum lease payments in each of the next five years ending December 31, and the periods thereafter, is as follows: 2018 2019 2020 2021 2022 Thereafter Total $ 6,794 $ 5,563 $ 1,929 $ 1,566 $ 1,569 $ 11,765 $ 29,186 Ambac rent expense for the aforementioned leases amounted to $2,717, $3,008 and $5,746 for the years ended December 31, 2017, 2016 and 2015, respectively. Beginning in 2016, rent expense is reduced by the reduction in junior surplus notes discussed above. The Segregated Account and Wisconsin Rehabilitation Proceeding On March 24, 2010, Ambac Assurance established a segregated account (the “Segregated Account”) and allocated to the Segregated Account certain financial guaranty insurance policies and other contingent liabilities, certain claims and other rights, and certain equity interests in subsidiaries. An insurance rehabilitation proceeding (the “Rehabilitation Proceeding”) was commenced with respect to the Segregated Account in the Wisconsin Circuit Court for Dane County (the “Rehabilitation Court”) on March 24, 2010 by the Commissioner of Insurance of the State of Wisconsin (the “Commissioner”) and the Rehabilitation Court entered an order of rehabilitation for the Segregated Account, appointing the Commissioner as Rehabilitator, and entered orders enjoining certain actions that could have an adverse effect on the financial condition of the Segregated Account. Various third parties filed motions or objections in the Rehabilitation Court and/or moved to intervene in the Segregated Account Rehabilitation Proceeding. On January 24, 2011, the Rehabilitation Court issued its Decision and Final Order Confirming the Rehabilitator’s Plan of Rehabilitation, with Findings of Fact and Conclusions of Law (the “Confirmation Order”). Notices of appeal from the Confirmation Order were filed by various parties, including policyholders. These appeals challenged various provisions of the Segregated Account Rehabilitation Plan and actions the Rehabilitator or the Wisconsin Commissioner of Insurance had taken in formulating the Segregated Account Rehabilitation Plan. These appeals from the Confirmation Order were consolidated with earlier-filed appeals challenging, among other things, the issuance of injunctive relief and a settlement between Ambac Assurance and various financial institutions. On October 24, 2013, the Wisconsin Court of Appeals affirmed the Confirmation Order and the Rehabilitation Court’s rejection of the objections filed by various third parties before entry of the Confirmation Order. On November 22, 2013, petitions seeking discretionary review of this ruling by the Wisconsin Supreme Court were filed by various parties. The Rehabilitator responded by opposing further review by the Wisconsin Supreme Court. On March 17, 2014, the Supreme Court of Wisconsin denied the petitions for review making the decision by the Wisconsin Court of Appeals final and controlling law. On February 10, 2016, certain investors filed a motion in the Rehabilitation Court requesting an order directing the Rehabilitator to show cause why the Interim Payment Percentage as set forth in the Segregated Account Rehabilitation Plan, as amended, should not be substantially increased and distributions promptly made to all holders. A hearing on the motion was held on March 29, 2016. On April 5, 2016, the Rehabilitation Court entered an order denying the motion, granting the Rehabilitator’s motion to quash a related deposition notice, and requiring interested parties in the proceedings to obtain leave of court before seeking any discovery. On July 15, 2016, the Rehabilitator filed a motion to confirm and declare the nature of the Segregated Account Rehabilitation Proceedings in order to avoid misunderstandings that may arise in litigation involving Ambac Assurance concerning certain military housing projects. Certain parties to these military housing litigations filed an opposition to the Rehabilitator’s motion on September 30, 2016. On October 11, 2016 the Rehabilitation Court held a hearing on the motion and on October 24, 2016, the Rehabilitation Court entered an order granting the Rehabilitator’s motion (the “October 24 Order”). On November 7, 2016, the interested parties that had opposed the Rehabilitator’s motion filed a notice of appeal from the October 24 order, and filed their opening brief in support of this appeal on January 17, 2017. The Rehabilitator filed a response brief in the Wisconsin Court of Appeals on February 15, 2017. On November 21, 2016, the Rehabilitator filed a motion to quash a subpoena served on the Wisconsin Commissioner of Insurance by certain parties to the military housing litigations. The Rehabilitation Court granted the Rehabilitator’s motion to quash on November 23, 2016. The interested parties that had served the subpoena filed an opposition to the Rehabilitator’s motion to quash on November 23, 2016, and filed on November 28, 2016 a motion to reconsider the November 23 order, which the Rehabilitator opposed on December 6, 2016. The Rehabilitation Court held a hearing on January 6, 2017 and entered an order on January 20, 2017 denying the motion to reconsider and clarifying procedures for discovery relating to the Segregated Account Rehabilitation Proceedings. On December 14, 2017, the Wisconsin Court of Appeals, District IV, issued a decision affirming the October 24 Order. On September 25, 2017, the Rehabilitator filed in the Rehabilitation Court a Motion to Further Amend The Plan of Rehabilitation Confirmed on January 24, 2011 To Facilitate An Exit from Rehabilitation. The evidentiary Confirmation Hearing was held on January 4, 2018, and continued on January 22, 2017. On January 22, 2018, the Rehabilitation Court entered an order granting the Rehabilitator’s motion and | Ambac Financial Group, Inc. 145 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) confirming the Second Amended Plan of Rehabilitation (the "Confirmation Order"), which became effective on February 12, 2018. Pursuant to the Confirmation Order, the Rehabilitation Court also ruled that, contrary to allegations made by certain parties to certain military housing litigations (the "MHPI Projects"), the Rehabilitation Court did not previously enter any order that could form the predicate for a claim of “Ambac Default” and confirmed Section 6.13 of the Second Amended Plan of Rehabilitation which, among other things, provided that any such default is deemed not to have existed or to be cured. On January 25, 2018,the MHPI Projects submitted a letter to the Rehabilitation Court objecting to the Rehabilitator's interpretation of Section 6.8 of the Second Amended Plan of Rehabilitation and requesting briefing on the issue and a conference with the Rehabilitation Court. On February 7, 2018, pursuant to the request of the Rehabilitator, the Rehabilitation Court issued an order denying the request for briefing and a conference and overruled the objection set forth in the letter of January 25th. On February 7, 2018, the Rehabilitator filed a motion with the Rehabilitation Court requesting injunctive relief against the MHPI Projects that would, among other things, enjoin the MHPI Projects from taking further actions or making further arguments, in any court or otherwise, in contravention of the Confirmation Order, the findings contained in the Confirmation Order or the provisions of the Second Amended Plan of Rehabilitation. On the same day, the Rehabilitation Court issued an order granting the Rehabilitator's February 7th motion (the "February 7 Order"). On February 26, 2018, the MHPI Projects filed a Notice of Motion and Motion for Reconsideration as well as a Notice of Motion and Motion for Expedited Hearing in the Rehabilitation Court, requesting reconsideration of the February 7 Order on an expedited basis. Briefing on the motions is expected to be completed by March 29, 2018 with a hearing to follow on a date to be determined. The Company expects the MHPI Projects to appeal the Confirmation Order and one or both of the orders issued by the Rehabilitation Court on February 7, 2018. Litigation Against Ambac Ambac Assurance is defending several lawsuits in which borrowers have brought declaratory judgment actions claiming, among other things, that Ambac Assurance’s claims for specific performance related to the construction and development of housing at various military bases to replace or cash-fund a debt-service-reserve surety bond, as required under the applicable loan documents (see Litigation Filed By Ambac), are time-barred or are barred by the doctrine of laches, that Ambac lacks standing on the basis that there has been an “Ambac Default,” and that Ambac is not entitled to specific performance pursuant to the terms of the loan documents. Specifically, Ambac Assurance is a defendant in the following actions: • Meade Communities LLC v. Ambac Assurance Corporation (Circuit Court, Anne Arundel County, Maryland, Case No. C-02- CV-15-003745). Plaintiff filed this action on December 2, 2015. Ambac Assurance’s answer was served on February 16, 2016. On April 26, 2017, the court granted a motion by Meade to amend its complaint to add a new count that Ambac had allegedly "unreasonably withheld" consent to a proposed Out-Year Development plan submitted by Meade to Ambac for approval. On April 28, 2017, Ambac Assurance filed a motion for summary judgment on all counts of the original Meade complaint. On April 28, 2017, Meade filed a motion for partial summary judgment on two counts of the complaint and certain Ambac Assurance affirmative defenses. On June 2, 2017, the parties filed oppositions to the summary judgment motions. The parties filed reply briefs in support of their motions on June 16, 2017. On July 14, 2017, the parties cross-moved for summary judgment on the additional count added to the amended complaint on April 26, 2017. The court heard oral argument on all motions for summary judgment on September 1, 2017. On October 20, 2017, the court granted Meade's motion for summary judgment that the statute of limitations had run on Ambac Assurance's counterclaim for specific performance and that this ruling was sufficient to fully resolve Meade's claims and Ambac's counterclaims concerning the debt service reserve surety bond. On November 27, 2017, Ambac Assurance filed a notice of appeal of the circuit court’s decision. On January 22, 2018, the court granted Meade's motion for summary judgment finding that Ambac Assurance lacked standing on the basis that there had been an "Ambac Default" by virtue of certain orders of the Rehabilitation Court. On January 26, 2018, Ambac Assurance filed a Motion to Alter or Amend Judgment with the Maryland Court arguing that the Rehabilitation Court's January 22 Confirmation Order constituted grounds for altering the judgment to award summary judgment on the "Ambac Default" issue for Ambac Assurance. On February 7, 2018, the Rehabilitation Court entered a further order enjoining Meade from continuing to argue that an Ambac Default occurred by virtue of the Rehabilitation Court's prior orders and requiring Meade to file that order with the Maryland Court. On February 8, 2018, Meade complied and filed the January 22nd and February 7th Rehabilitation Court orders with the Maryland court. On February 12, 2018, the Maryland Court granted Ambac's motion to stay enforcement of the Court's January 22nd amended order concerning "Ambac Default" and granting Meade an extension until March 14, 2018 to oppose Ambac's Motion to Alter or Amend Judgment. • Monterey Bay Military Housing LLC and Monterey Bay Land LLC v. Ambac Assurance Corporation (Superior Court, Monterey County, California, Case No. 15CV000599). Plaintiff filed this action on December 4, 2015. Ambac Assurance filed an answer on January 19, 2016. On March 30, 2017, Ambac Assurance filed a motion for summary judgment on all counts of the Monterey Bay complaint. On March 30, 2017, Monterey Bay filed a motion for partial summary judgment on two counts of the complaint and certain Ambac Assurance affirmative defenses. The parties filed their opposition briefs on June 2, 2017 and reply briefs on June 9, 2017. On June 19, 2017, the court issued a preliminary order that partially granted Monterey Bay's motion for summary judgment and ruled that the California statute of limitations had run on Ambac Assurance's claim for specific performance, subject to Ambac Assurance's defense of equitable tolling. The court also partially granted Ambac Assurance's motion for summary judgment on certain of Monterey Bay's declaratory judgment claims. On June 23, 2017, Ambac Assurance withdrew its defense of equitable tolling. The parties agreed that the court's summary judgment ruling on the statute of limitations was sufficient to end the case at the trial court level and submitted final orders to the court for approval. The court signed the final orders on July 13, 2017. On September 14, 2017, Ambac Assurance filed a notice of appeal. | Ambac Financial Group, Inc. 146 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) The Company believes that it has substantial defenses to the claims raised in these lawsuits and intends to defend itself vigorously; however, the Company is not able to predict the outcome of these actions. Monterey Bay Military Housing, LLC, et al. v. Ambac Assurance Corporation, et al. (United States District Court, Northern District of California, San Jose Division, Case No. 17-cv-04992-BLF, filed August 28, 2017). Plaintiffs-the corporate developers of various military housing projects-filed an amended complaint on October 27, 2017 asserting claims for (i) violation of 18 U.S.C §§ 1962(c) and 1962(d) (civil Racketeer Influenced and Corrupt Organizations Act (“RICO”) and conspiracy to commit civil RICO), (ii) breach of fiduciary duty, (iii) aiding and abetting breach of fiduciary duty, (iv) fraudulent misrepresentation, (v) fraudulent concealment and (vi) conspiracy to commit fraud. Ambac Assurance and a former employee of Ambac Assurance are included in the named defendants. The claims relate to bonds and debt certificates (insured by Ambac Assurance) that were issued to finance the renovation and construction of housing at certain military bases. Plaintiffs allege that defendants secretly conspired to overcharge plaintiffs for the financing of the projects and directed the excess profits to themselves. Plaintiffs allege defendants generated these excess profits by supposedly charging inflated interest rates, manipulating “shadow ratings,” charging unnecessary fees, rigging the Guaranteed Investment Contract (“GIC”) bidding process, and hiding evidence of their alleged wrongdoing. Plaintiffs seek, among other things, compensatory damages, disgorgement of profits and fees, punitive damages, trebled damages and attorneys’ fees. On September 21, 2017, Ambac Assurance filed a motion to transfer venue to the United States District Court for the Southern District of New York, which motion plaintiffs opposed on October 5, 2017. The Court heard oral argument on November 30, 2017 and requested additional briefing from both parties. After the submission of the additional briefing, the Court denied Ambac’s motion to transfer on January 2, 2018. Ambac and the other defendants filed motions to dismiss the amended complaint on November 13, 2017, which Plaintiffs opposed on December 15, 2017. The motions are fully briefed and a hearing is scheduled on the motions for April 12, 2018. Ambac believes the lawsuit is without merit. Ambac Assurance’s estimates of projected losses for RMBS transactions consider, among other things, the RMBS transactions’ payment waterfall structure, including the application of interest and principal payments and recoveries, and depend in part on our interpretations of contracts and other bases of our legal rights. From time to time, bond trustees and other transaction participants have employed different contractual interpretations. It is not possible to predict whether additional disputes will arise, nor the outcomes of any potential litigation. It is possible that there could be unfavorable outcomes in this or other disputes or proceedings and that our interpretations may prove to be incorrect, which could lead to changes to our estimate of loss reserves. Ambac Assurance has periodically received various regulatory inquiries and requests for information with respect to investigations and inquiries that such regulators are conducting. Ambac Assurance has complied with all such inquiries and requests for information. Ambac is involved from time to time in various routine legal proceedings, including proceedings related to litigation with present or former employees. Although Ambac’s litigation with present or former employees is routine and incidental to the conduct of its business, such litigation can result in large monetary awards when a civil jury is allowed to determine compensatory and/or punitive damages for, among other things, termination of employment that is wrongful or in violation of implied contracts. It is not reasonably possible to predict whether additional suits will be filed or whether additional inquiries or requests for information will be made, and it is also not possible to predict the outcome of litigation, inquiries or requests for information. It is possible that there could be unfavorable outcomes in these or other proceedings. Legal accruals for litigation against Ambac which are probable and reasonably estimable, and management's estimated range of loss for such matters, are not material to the operating results or financial position of the Company. For the litigation matters Ambac is defending that do not meet the “probable and reasonably estimable” accrual threshold and where no loss estimates have been provided above, management is unable to make a meaningful estimate of the amount or range of loss that could result from unfavorable outcomes. Under some circumstances, adverse results in any such proceedings could be material to our business, operations, financial position, profitability or cash flows. The Company believes that it has substantial defenses to the claims above and, to the extent that these actions proceed, the Company intends to defend itself vigorously; however, the Company is not able to predict the outcomes of these actions. Litigation Filed or Joined by Ambac In the ordinary course of their businesses, certain of Ambac’s subsidiaries assert claims in legal proceedings against third parties to recover losses already paid and/or mitigate future losses. The amounts recovered and/or losses avoided which may result from these proceedings is uncertain, although recoveries and/or losses avoided in any one or more of these proceedings during any quarter or fiscal year could be material to Ambac’s results of operations in that quarter or fiscal year. Erste Europäische Pfandbriefund Kommunalkreditbank AG In Luxemburg and Ambac Assurance Corporation v. City of San Bernardino, California (United States Bankruptcy Court, Central District of California, Riverside Division, Docket No. 15-1185, filed on January 7, 2015). Plaintiffs commenced this adversary proceeding, which relates to the Debtor’s obligations under the Public Employees Retirement Law, California Government Code Section 20000 et seq. (the “Retirement Law”), in connection with the City of San Bernardino’s bankruptcy proceeding. In the complaint, plaintiffs seek a declaratory judgment that the Debtor is obligated to make equivalent payments to both the holders of certain pension obligation bonds (the “Bonds”), a portion of which are insured by Ambac, and the California Public Employees Retirement Systems (“CalPERS”) to fund pension and other retirement benefits. It is the plaintiffs’ position that they are entitled to declaratory judgment because (i) when the City issue the Bonds, the City argued and a California court found, that the obligations under the Bonds were | Ambac Financial Group, Inc. 147 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) of the same legal character as the City’s obligations to CalPERS and (ii) the amounts owed to the bondholders are to CalPERS are merely separate portions of a single obligation owed by the Debtor under the Retirement Law. Plaintiffs therefore seek equivalent payment as to CalPERS, whether such payment takes for the form of current payments during the bankruptcy proceeding and thereafter, payments otherwise made in connection with the Retirement Law or any agreements entered into in accordance therewith, or distributions under a plan of adjustment. On March 13, 2015, the City filed a motion to dismiss the complaint, which plaintiffs opposed. On May 11, 2015, the court heard oral argument and granted the City’s motion to dismiss. On June 8, 2015, plaintiffs filed a notice of appeal of the court’s order granting the City’s motion to dismiss with the Bankruptcy Appellate Panel for the Ninth Circuit and filed their appellate brief on January 5, 2016. The parties have reached a settlement and pursuant to the settlement agreement dated March 28, 2016, the plaintiffs have agreed to dismiss the appeal with prejudice upon confirmation of the City’s plan of adjustment by the bankruptcy judge and the plan of adjustment becoming effective. The plan of adjustment was confirmed on February 7, 2017 and became effective on June 15, 2017. Accordingly, the parties filed a stipulation agreeing to dismiss the appeal with prejudice with the Bankruptcy Appellate Panel on June 25, 2017. The bankruptcy appellate panel dismissed the appeal on July 13, 2017. Puerto Rico: Assured Guaranty Corp., Assured Guaranty Municipal Corp., and Ambac Assurance Corporation v. Alejandro Garcia Padilla, et al. (United States District Court, District of Puerto Rico No. 3:16-cv-01037, filed January 7, 2016). Ambac Assurance, along with co-plaintiffs Assured Guaranty Corp. and Assured Guaranty Municipal Corp., filed a complaint for declaratory and injunctive relief to protect its rights against the illegal clawback of certain revenue by the Commonwealth of Puerto Rico. Defendants (including the Government Development Bank (GDB) President but solely in her capacity as a member of the Working Group For The Fiscal and Economic Restoration of Puerto Rico) filed a motion to dismiss for lack of subject matter jurisdiction on January 29, 2016. The GDB President, in her official capacity, moved to dismiss for failure to state a claim upon which relief can be granted on January 29, 2016. Plaintiffs filed their oppositions to the motions on February 16, 2016 and Defendants filed replies on February 23, 2016. This case was administratively consolidated with a similar case before the same judge, Financial Guaranty Insurance Company v. Alejandro Garcia Padilla, et al. (United States District Court, District of Puerto Rico No. 3:16- cv-01095). On October 4, 2016, the court denied the Defendants’ and GDB President’s motions to dismiss with respect to all claims asserted by Ambac Assurance and Assured. On October 14, 2016, Defendants filed a Notice of Automatic Stay, asserting that Plaintiffs’ claims have been rendered moot and further asserting that the case is automatically stayed under section 405 of the Puerto Rico Oversight, Management and Economic Stability Act (PROMESA). On October 28, 2016, Plaintiffs informed the court that neither party was currently challenging the stay, and expressly reserved their right to seek to lift the stay at any time. Plaintiffs also objected to Defendants’ assertion that the case should be dismissed as moot. PROMESA’s litigation stay expired on May 2, 2017. On May 3, 2017, a petition under Title III of PROMESA was filed on behalf of the Commonwealth of Puerto Rico. On May 16, 2017, Defendants filed a statement requesting that the court take notice of the stay resulting from the Commonwealth’s Title III filing. On May 17, 2017, the court issued an order staying this case until further order of the court. Ambac Assurance Corporation v. Puerto Rico Highways and Transportation Authority (United States District Court, District of Puerto Rico, No. 16-cv-1893, filed May 10, 2016). Ambac Assurance filed a complaint against the Puerto Rico Highways and Transportation Authority (PRHTA) on May 10, 2016, alleging breach of fiduciary duty and breach of contract in connection with PRHTA’s extension of an existing toll road concession agreement. The complaint alleges that it was inappropriate for PRHTA to enter into the extension agreement in its current state of financial distress because PRHTA has no control over, and is unlikely to receive, the proceeds of the transaction. The complaint also seeks specific performance of PRHTA’s contractual duty to provide information requested by Ambac Assurance under documents related to PRHTA bonds insured by Ambac Assurance. Ambac Assurance filed related motions seeking the appointment of a provisional receiver for PRHTA and expedited discovery. In addition to those remedies, Ambac Assurance seeks an order of the court that would, among other things, compel PRHTA to allow Ambac Assurance to inspect PRHTA’s financial records on an ongoing basis and permanently enjoin PRHTA from committing further breaches of its fiduciary and contractual duties. On July 1, 2016, PRHTA filed an Emergency Notice of Stay, asserting that the case was automatically stayed under section 405 of PROMESA. Ambac Assurance filed a response on July 11, 2016, disagreeing that the PROMESA stay applies but electing not to contest the stay at such time and reserving the right to challenge it or to seek to lift the stay in the future. Ambac Assurance also asserted that PRHTA still is obligated to make available to Ambac Assurance certain information, notwithstanding the stay on litigation and provided a proposed order for the court to issue. PRHTA filed a reply on July 18, 2016, contesting Ambac Assurance’s characterization, and provided an alternative order for the court to issue. Ambac Assurance’s response was filed July 25, 2016. PRHTA also filed an Urgent Motion to Exempt PRHTA from Outstanding Filings in the case during the pendency of the stay, which was granted. On August 23, 2016 the court issued an order staying the case. PROMESA’s litigation stay expired on May 2, 2017. The Commonwealth and Oversight Board have stated to Ambac Assurance that they believe this action is stayed due to the Commonwealth’s Title III filing. Subsequent to that statement, on May 21, 2017, a petition under Title III of PROMESA was filed on behalf of PRHTA. On May 24, 2017, the court issued an order staying this case until further order of the court. Lex Claims, LLC et al. v. Alejandro Garcia Padilla et al. (United States District Court, District of Puerto Rico, No. 16-2374, filed July 20, 2016). On October 7, 2016, certain General Obligation bondholder Plaintiffs in an action to which Ambac Assurance was not then a party filed a motion for leave to amend their complaint and for partial relief from the PROMESA stay. Plaintiffs’ proposed second amended complaint added the Puerto Rico Sales Tax Financing Corporation (COFINA), COFINA’s executive director, and the trustee for the COFINA bonds as Defendants, and asserted numerous claims that challenge the legal validity of the COFINA structure and seek injunctive relief requiring the sales and use tax proceeds securing COFINA’s bonds to be transferred to the Puerto Rico Treasury. Plaintiffs contended that many of the claims | Ambac Financial Group, Inc. 148 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) challenging COFINA are not subject to PROMESA’s litigation stay provisions. On October 24, 2016, Defendants filed an opposition to the motion for leave to amend, arguing that the entire action is subject to the PROMESA stay. On October 26, 2016, Ambac Assurance filed a motion for leave to intervene and in support of the PROMESA stay. Ambac Assurance seeks to intervene principally to argue that the claims challenging COFINA are stayed by PROMESA, but also reserves the right to move to dismiss or otherwise defend against those claims should the court determine they are not stayed. On November 4, 2016, the Court granted Plaintiffs’ motion for leave to amend. Plaintiffs filed their second amended complaint that same day. On November 7, 2016, government Defendants sought to stay the case. On February 17, 2017, the court granted the motions to intervene of Ambac Assurance and certain other parties. The court also denied Defendants’ motion to stay, rejecting the arguments in support of the stay filed by Defendants and the intervenors, including Ambac Assurance. On March 20, 2017, Ambac Assurance filed in the district court an answer to the second amended complaint and a motion to dismiss Plaintiffs’ claim against COFINA, to strike certain portions of the second amended complaint, or, in the alternative, to certify the question of COFINA’s constitutionality to the Supreme Court of Puerto Rico. Certain other intervenors also filed answers and various motions in the district court. On April 4, 2017, the U.S. Court of Appeals for the First Circuit reversed the district court’s decision concerning the application of the PROMESA stay, which had the effect of reinstating the stay. PROMESA’s litigation stay expired on May 2, 2017. On May 3, 2017, a petition under Title III of PROMESA was filed on behalf of the Commonwealth of Puerto Rico. On May 16, 2017, Defendants filed a statement requesting that the court take notice of the stay resulting from the Commonwealth’s Title III filing. On May 17, 2017, the court issued an order staying this case until further order of the court. Ambac Assurance Corporation v. Puerto Rico, et al. (United States District Court, District of Puerto Rico, No. 17-1567, filed May 2, 2017). On May 2, 2017, Ambac Assurance filed a complaint seeking a declaration that the Commonwealth’s Fiscal and Economic Growth Plan (the FEGP) and a recently enacted statute called the “Fiscal Plan Compliance Law” are unconstitutional and unlawful because they violate the Contracts, Takings, and Due Process Clauses of the U.S. Constitution, are preempted by PROMESA, and are unlawful transfers of property from COFINA to the Commonwealth in violation of PROMESA. The complaint further seeks an injunction against the filing of any Title III petitions, an injunction against the enactment or enforcement of any future legislation, rules, budgets, or restructuring plans premised on the FEGP, and a declaration that the Commonwealth is liable for any funds unlawfully transferred to it from COFINA. The complaint also seeks a declaration that the FEGP and Fiscal Plan Compliance Law violate covenants made by the Commonwealth and COFINA in the COFINA Resolution, which constitute Events of Default under the COFINA Resolution. On May 3, 2017, a petition under Title III of PROMESA was filed on behalf of the Commonwealth of Puerto Rico, and on May 5, 2017, a petition under Title III of PROMESA was filed on behalf of COFINA. On May 15, 2017, the Oversight Board filed a statement requesting that the court take notice of the stays resulting from these Title III filings. On May 17, 2017, the court issued an order staying this case until further order of the court. Ambac Assurance Corporation v. Puerto Rico, et al. (United States District Court, District of Puerto Rico, No. 17-1568, filed May 2, 2017). On May 2, 2017, Ambac Assurance filed a complaint alleging that various moratorium laws and executive orders enacted by the Commonwealth to claw back funds from the PRIFA, PRHTA, and PRCCDA bonds violate the Contracts, Takings, and Due Process Clauses of the U.S. Constitution, are preempted by PROMESA, and unlawfully transfer PRHTA, PRCCDA, and PRIFA property to the Commonwealth. The complaint further seeks a declaration that the Commonwealth is liable for any funds unlawfully transferred to it from COFINA, an injunction against enforcement of the moratorium laws and executive orders, an injunction against the filing of any Title III petitions, and an injunction against the enactment or enforcement of any future legislation, rules, budgets, or restructuring plans premised on the FEGP. On May 3, 2017, a petition under Title III of PROMESA was filed on behalf of the Commonwealth of Puerto Rico. On May 15, 2017, the Oversight Board filed a statement requesting that the court take notice of the stay resulting from the Commonwealth’s Title III filing. On May 17, 2017, the court issued an order staying this case until further order of the court. Ambac Assurance Corporation v. U.S. Department of Treasury et al. (United States District Court, District of Columbia, No. 17-809, filed May 2, 2017). On May 2, 2017, Ambac Assurance filed a complaint against the U.S. Department of Treasury and Steven Mnuchin, in his official capacity as Secretary of the Treasury, alleging that Puerto Rico’s ongoing diversion of rum taxes from PRIFA violates the Contracts, Takings, and Due Process Clauses of the U.S. Constitution, and seeking an equitable lien on all rum taxes possessed by the U.S. Treasury, and an injunction preventing their transfer to the Commonwealth, in order to prevent further dissipation of those funds by the Commonwealth. On May 24, 2017, the Oversight Board filed a statement requesting that the court take notice of the stay resulting from the Commonwealth’s Title III filing. On May 25, 2017, the court issued an order staying this case pending the final disposition of the Title III proceedings. Ambac Assurance Corporation v. Bank of New York Mellon (United States District Court, Southern District of New York. No. 1:17-cv-03804, filed May 2, 2017). On May 2, 2017, Ambac Assurance filed a complaint in New York State Supreme Court, New York County, against the trustee for the COFINA bonds, Bank of New York Mellon (BNY), alleging breach of fiduciary, contractual, and other duties for failing to adequately and appropriately protect the holders of certain Ambac Assurance-insured senior COFINA bonds. The complaint seeks money damages; a declaration that BONY breached its fiduciary, contractual, and other duties; a declaration compelling BNY to recognize an event of default under the COFINA Resolution and accelerate the COFINA debt; an injunction to prevent BNY from making payments to holders of subordinate COFINA bonds; and forced replacement of BNY as trustee. On May 19, 2017, BNY filed a notice of removal of this action from New York state court to the United States District Court for the Southern District of New York. On May 30, 2017, the United States District Court for the District of Puerto Rico entered an order in an adversary proceeding brought by BNY (No. 1:17-ap-00133) staying this litigation pending further order of the court. | Ambac Financial Group, Inc. 149 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) Bank of New York Mellon v. COFINA, et al. (United States District Court, District of Puerto Rico, No. 1:17-ap-00133, filed May 16, 2017). On May 16, 2017, BNY filed an adversary complaint in COFINA’s Title III case for an order to show cause why the court should not: (i) grant an interpleader of funds that BNY is holding for future interest payments to holders of COFINA bonds; (ii) stay pending and future litigation against BNY related to its role as trustee for COFINA bonds, including the action by Ambac Assurance against BNY; and (iii) discharge BNY from any liability in association with the interpleaded funds. BNY filed this interpleader action against COFINA and certain creditors of COFINA, including Ambac Assurance, that have made competing claims of entitlement to funds held by BNY in order to determine the parties’ respective entitlements to the funds. On May 30, 2017, the court granted BNY’s motion to interplead, and on June 6, 2017, the court set a schedule for discovery and briefing. Discovery and briefing are ongoing; summary judgment briefing is scheduled to conclude on December 1, 2017. An ad hoc group of general obligation bondholders and the Official Committee of Unsecured Creditors for the Commonwealth of Puerto Rico (the Creditors’ Committee) each moved to intervene (respectively) on May 23 and July 31, 2017; these motions to intervene were denied (respectively) on July 6 and August 1, 2017. On August 29, 2017, the Creditors’ Committee moved to intervene again, this time in its capacity as Commonwealth Agent. Multiple parties objected to the motion, including Ambac Assurance. Oral argument was heard in front of Magistrate Judge Dein on September 15, 2017. On September 27, 2017, Judge Dein issued an opinion and order denying the motion to intervene but holding that the Creditors’ Committee may renew its request to intervene as a statutory committee, rather than as Commonwealth Agent. Fact stipulations among the parties were entered and so-ordered on September 26 and October 12, 2017, obviating the need for certain depositions. On November 6, 2017, a number of parties, including Ambac Assurance, filed motions for summary judgment; Ambac Assurance argued that the Commonwealth’s and COFINA’s pre-petition actions constituted defaults under the COFINA bond resolution, and these defaults have ripened into events of default resulting in the senior COFINA bondholders’ absolute priority to the funds in BNY’s possession. Briefing on the summary judgment motions was completed on January 5, 2018. Peaje Investments LLC v. Puerto Rico Highways and Transportation Authority, et al. (United States District Court, District of Puerto Rico, No. 1:17-ap-00151, filed May 31, 2017). On June 15, 2017, Ambac Assurance moved to intervene in an adversary proceeding brought by Peaje Investments (Peaje), a holder of 1968 Bonds issued by PRHTA, against PRHTA. On May 31, 2017, Peaje filed a complaint seeking relief with respect to its ownership of the 1968 Bonds, including a declaration that the toll road revenues pledged to the 1968 Bonds are “special revenues” under Section 922 of the Bankruptcy Code, an injunction preventing the diversion of toll revenues to the Commonwealth and ordering the application of the toll revenues to the 1968 Bonds, and various declarations and injunctions related thereto. Peaje also filed a motion for a temporary restraining order and preliminary injunction on the same day, seeking to enjoin PRHTA from diverting the toll revenues to the Commonwealth. A hearing on the motion for a temporary restraining order was held on June 5, 2017, at which time Peaje withdrew the motion for a temporary restraining order. In its motion to intervene, Ambac Assurance argued that issues in this case will have a significant impact on Ambac’s own interests with respect to PRHTA bonds. On July 21, 2017, the court denied Ambac Assurance's motion to intervene. On September 8, 2017, the court denied Peaje’s motion for a preliminary injunction, finding that Peaje had not demonstrated either (i) a likelihood of success on the merits of its underlying claim that the 1968 bonds are secured by a statutory lien, or (ii) that it would be irreparably harmed in the absence of a preliminary injunction. Peaje has appealed this denial of the preliminary injunction to the U.S. Court of Appeals for the First Circuit; the First Circuit has not yet ruled on this appeal. On October 10, 2017, Peaje filed an amended complaint; Defendants filed answers to the amended complaint on November 17, 2017. Ambac Assurance Corporation v. Puerto Rico, et al. (United States District Court, District of Puerto Rico, No. 1:17-ap-00159, filed June 8, 2017). On June 8, 2017, Ambac Assurance filed an adversary complaint in the Commonwealth’s Title III case against the Commonwealth, PRHTA, the Oversight Board, AAFAF, and other Commonwealth government officers. The complaint seeks declarations that (i) various moratorium laws ("Moratorium Legislation") enacted by the Commonwealth and executive orders ("Moratorium Orders") issued by the Governor to claw back funds from the PRIFA, PRHTA, and PRCCDA bonds and (ii) the FEGP and Fiscal Plan Compliance Act violate the Contracts, Takings, and Due Process Clauses of the U.S. Constitution, are preempted by PROMESA, and unlawfully transfer PRHTA, PRCCDA, and PRIFA property to the Commonwealth. The complaint further seeks a declaration that revenues pledged to the PRHTA bonds are “special revenues” under Sections 922 and 928 of the Bankruptcy Code, and an injunction compelling Defendants to remit the pledged special revenues to PRHTA for payment of the PRHTA bonds. On July 7, 2017, Ambac Assurance filed an amended complaint that added an additional claim for relief: a declaration that the funds held in the PRHTA reserve accounts are property of the PRHTA bondholders. On August 3, 2017, the court entered an order, to which all parties stipulated, providing that BNYM, as fiscal agent for PRHTA bondholders, shall continue to hold the funds in the reserve accounts established under PRHTA’s governing bond documents until further order of the court. On October 27, 2017, the court ordered that the Creditors’ Committee is entitled to “limited intervention,” in the proceeding. On July 28, 2017, Defendants moved to dismiss Ambac Assurance’s complaint; briefing on the motion to dismiss concluded on October 31, 2017, and oral argument on the motion was held on November 21, 2017. On February 27, 2018, the court granted Defendants’ motion to dismiss. As to certain of the claims, the court found that it lacks subject matter jurisdiction (i) to the extent the claims seek to invalidate the certification of the FEGP and prohibit certain actions under PROMESA due to alleged non-compliance with PROMESA requirements that are predicates to certification of the FEGP, or (ii) to the extent Ambac Assurance sought a determination of its lien rights over the PRHTA reserve accounts. As to other claims, the court found that Ambac Assurance had failed to state a claim upon which the court could grant relief, including that (i) as to constitutional issues, Ambac Assurance had failed to plead facts sufficient to allow the court to draw a reasonable inference that the Moratorium Legislation, Moratorium Orders, and Fiscal Plan Compliance Act were “unreasonable or unnecessary to effectuate an important government purpose” and had failed to allege plausibly that the FEGP is an exercise of Commonwealth legislative power, (ii) Ambac Assurance had failed to plead facts sufficient to show that the Moratorium Legislation and Moratorium Orders prohibited the payment of principal and interest or purported to bind creditors to any reduction of the outstanding obligations and therefore would have been preempted by PROMESA under PROMESA Section 303(1), and Ambac Assurance failed to plead plausible, ripe claims that the Moratorium Orders are unlawful under PROMESA section | Ambac Financial Group, Inc. 150 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) 303(3), (iii) the automatic stay is currently in effect and renders unavailable any cause of action pursuant to Section 407 of PROMESA, including claims by PRHTA bondholders that PRHTA should be compensated for any pledged special revenues transferred away from it in violation of applicable law, (iv) the court is not required or empowered under PROMESA or the Bankruptcy Code to order the payment of pledged special revenues to the PRHTA bondholders, and (v) Ambac Assurance had failed to plead facts sufficient to show that the PRHTA reserve accounts are the property of the bondholders. Finally, the court held that PROMESA section 305 prevented it from ordering any relief on Ambac’s claim that the PRHTA reserve accounts are held in trust for bondholders. Official Committee of Unsecured Creditors v. Whyte (United States District Court, District of Puerto Rico, No. 1:17-ap-00257, filed September 8, 2017). On August 10, 2017, the court approved a stipulation between the Oversight Board, the Commonwealth, COFINA, and certain creditor parties, including Ambac Assurance, to resolve the Commonwealth-COFINA dispute regarding entitlement to sales and use taxes. The stipulation contemplates separate agents for each of COFINA and the Commonwealth, which agents will litigate the dispute, while preserving the ability of interested parties, including Ambac Assurance, to participate in the litigation. The court order names Ms. Bettina Whyte as the agent for COFINA, and names the Creditors’ Committee as the agent for the Commonwealth. On September 8, 2017, pursuant to a stipulation and scheduling order entered by the court, the Creditors’ Committee, as Commonwealth Agent, filed an adversary proceeding against Bettina Whyte, as COFINA Agent. The thirteen-count complaint for declaratory relief alleges (a) that COFINA’s enabling legislation did not, and could not, transfer present ownership of the future Sales and Use Tax revenues to COFINA, (b) that this purported transfer is governed by Article 9 of the Uniform Commercial Code and is not enforceable, was never perfected, and is avoidable and (c) that the COFINA structure is unconstitutional because the COFINA enabling legislation was designed to evade the constitutional debt limit, the constitutional priority of payment granted to Puerto Rico’s public debtholders, and the balanced budget provision. The Creditors’ Committee filed a revised complaint on October 25, 2017, making technical corrections to the original complaint; the COFINA Agent filed an answer to this amended complaint on October 30, 2017. On November 6, 2017, Ambac Assurance filed a notice of intervention, together with an answer and counterclaims; other interested parties named in the stipulation governing the Commonwealth-COFINA dispute similarly filed answers and counterclaims. On November 13, 2017, Ambac Assurance and certain other interested parties filed motions seeking to enforce the stipulated scope of the Commonwealth-COFINA dispute. Ambac Assurance moved to strike the Commonwealth Agent’s fourth through thirteenth causes of action as beyond the stipulated scope of the dispute, which is narrowly focused on whether the Pledged Sales Taxes are the property of COFINA. On December 21, 2017, the District Court dismissed all but the first and second causes of action in the Commonwealth Agent’s complaint as outside the scope of the Commonwealth-COFINA dispute, ruling that the stipulation governing such dispute contemplates a narrow focus on the ownership of the Pledged Sales Taxes. On January 4, 2018, the Commonwealth Agent filed a motion to clarify the District Court’s December 21 scope order, seeking reconsideration of the dismissal of the Commonwealth’s Agent’s constitutional claims or leave to amend its complaint such that its constitutional claims might fall within the permitted scope. Ambac Assurance objected to this motion on January 8, 2018. On January 10, 2018, the District Court denied the Commonwealth Agent’s motion to reconsider, but permitted the Commonwealth Agent to move to amend its complaint in a manner consistent with the December 21 scope order. The Commonwealth Agent moved to file an amended complaint on January 11, 2018, which motion Ambac Assurance opposed on January 12, 2018; the District Court granted the Commonwealth Agent’s motion on January 13, 2018, and the Commonwealth Agent filed its amended complaint on January 16, 2018; the COFINA Agent, Ambac Assurance, and other parties filed answers and counterclaims to the amended complaint on January 30, 2018. The Commonwealth and other parties filed answers to these counterclaims on February 13 and 14, 2018. Motions for summary judgment were filed on February 21, 2018, with a hearing on those motions scheduled for April 10, 2018. In re Financial Oversight and Management Board for Puerto Rico as representative of Puerto Rico Electric Power Authority (United States District Court, District of Puerto Rico, No. 1:17-bk-04780, filed July 2, 2017). On January 31, 2018, the Oversight Board filed an urgent motion for approval of a post-petition revolving loan from the Commonwealth to PREPA in an initial amount of $550 million, up to $1.3 billion (which figure later was lowered to $1.0 billion in amended filings on February 12, 2018). On February 2, 2018, Ambac Assurance filed an objection to the urgent motion. A hearing on the urgent motion was held on February 15, 2018, at the conclusion of which the Court ruled that the Oversight Board had not established the need for or the legality of the requested $1.0 billion facility, but held the motion in abeyance without prejudice to amendment. On February 16, 2018, the Oversight Board filed a revised request for a $300 million loan; on February 19, 2018, the Court entered an order approving the $300 million loan from the Commonwealth to PREPA. Student Loans Exposure: CFPB v. Nat’l Collegiate Master Student Loan Trust (United States District Court, District of Delaware, Case No. 1:17-cv-01323, filed September 18, 2017). The Consumer Financial Protection Bureau (“CFPB”) filed a complaint against fifteen National Collegiate Student Loan Trusts, regarding alleged improprieties and deficiencies in servicing practices. Simultaneous with the filing of its complaint, CFPB also filed a motion for entry of a proposed consent judgment that would grant monetary damages and injunctive relief against the Trusts. Ambac guaranteed certain securities issued by three of the Trusts and indirectly insures six other Trusts. Ambac filed a motion to intervene in the action on September 20, 2017. On November 1, 2017, CFPB and the entities purporting to act on behalf of the Trusts filed briefs in response to Ambac’s motion to intervene stating that they do not oppose Ambac’s motion. Ambac filed a reply brief in further support of its motion to intervene on November 20, 2017. Ambac’s motion remains pending. Nat’l Collegiate Master Student Loan Trust v. Pa. Higher Education Assistance Agency (PHEAA) (Delaware Court of Chancery, C.A. No. 12111-VCS, filed March 21, 2016). Plaintiffs purporting to act on behalf of fifteen National Collegiate Student Loan Trusts filed a lawsuit against PHEAA, a servicer of loans in the Trusts, alleging improprieties and deficiencies in servicing practices and seeking an order compelling PHEAA to submit to an emergency audit. PHEAA submitted papers contesting the validity of certain transfers to Plaintiffs of beneficial | Ambac Financial Group, Inc. 151 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) ownership interests in the Trusts. In addition, the Owner Trustee of the Trusts, Wilmington Trust Company, WTC, citing irreconcilable differences with Plaintiffs, has resigned from its role as Owner Trustee and moved for appointment of a successor Owner Trustee. On October 9, 2017, the court directed the parties to meet and confer to develop a process for selecting an interim Owner Trustee. Ambac guaranteed certain securities issued by three of the Trusts and indirectly insures certain securities in six other Trusts. Ambac filed a motion to intervene in the action on October 23, 2017, for the limited purpose of being heard regarding the appointment of a successor Owner Trustee and regarding WTC’s contractual commitment and obligation to remain in that role until such appointment is made. Plaintiffs opposed Ambac’s motion to intervene on October 27, 2017. On October 30, 2017, the court denied without prejudice a stipulation filed by Plaintiffs and WTC purporting to address the Owner Trustee issue, and instructed that all interested parties be given notice and an opportunity to participate in discussions to formulate a process for selecting a successor Owner Trustee. Ambac filed a reply brief in further support of its motion to intervene on November 3, 2017. On November 7, 2017, the court ruled in Plaintiffs’ favor and confirmed the validity of the ownership transfers that PHEAA had disputed. On January 12, 2018, Plaintiffs filed a motion for injunctive or declaratory relief requiring WTC, as Owner Trustee, and GSS Data Services, Inc., as Administrator, to resume processing for payment bills submitted by lawyers purporting to act on the Trusts’ behalf. Oppositions to Plaintiffs’ motion are due on March 1, 2018. Negotiations regarding the selection of a new or interim Owner Trustee are ongoing. Military Housing: Ambac Assurance has filed various lawsuits seeking specific performance of obligations of borrowers on loans related to the construction and development of housing at various military bases to replace or cash-fund a debt-service-reserve surety bond provided by Ambac Assurance, as required under the applicable loan documents. Defendants have asserted, among other things, that Ambac Assurance's claims are barred by the doctrine of laches, that Ambac Assurance lacks standing on the basis that there has been an “Ambac Default” or "Credit Enhancer Default" and that Ambac Assurance is not entitled to specific performance pursuant to the terms of the loan documents. Specifically, Ambac Assurance has instituted the following actions: • Ambac Assurance Corporation v. Riley Communities, LLC (District Court, Shawnee County Kansas, No. 2016-CV-00026). Ambac Assurance filed this action on January 8, 2016. On February 2, 2016, defendant served its answer. On September 29, 2017, Ambac Assurance filed a motion for summary judgment on all counts of the Complaint and most of Riley's affirmative defenses. On September 29, 2017, Riley filed a motion for partial summary judgment on two of its affirmative defenses, including statute of limitations and "Credit Enhancer Default" by virtue of certain orders of the Rehabilitation Court. The parties filed their oppositions to the summary judgment motions on October 27 and replies November 10, 2017. Due to the Rehabilitation Court’s January 22 Order, on January 24, 2018, Ambac Assurance filed a Notice of Events Subsequent and Supplemental Brief in support of its Motion for Summary Judgment arguing that the Rehabilitation Court's January 22 order constituted further grounds for entering summary judgment for Ambac Assurance on the "Credit Enhancer Default" argument. • Ambac Assurance Corporation v. Fort Leavenworth Frontier Heritage Communities, II, LLC (U.S. District Court, District of Kansas, Index No. 15-CV-9596). Ambac Assurance filed this action on November 19, 2015. On January 4, 2016, defendant moved to dismiss for failure to join an indispensable party, which Ambac Assurance opposed on January 25, 2016. On June 29, 2016, the court denied defendant’s motion to dismiss and granted Ambac Assurance leave to file an amended complaint, which was filed on July 13, 2016. On August 1, 2016, Defendant filed a motion to dismiss the amended complaint for lack of subject matter jurisdiction. Ambac Assurance opposed the motion. On March 17, 2017, the court granted Fort Leavenworth's motion to dismiss for lack of subject matter jurisdiction. On March 28, 2017, Ambac re-filed the case in state court in Shawnee County, Kansas. The re-filed case is styled Ambac Assurance Corporation v. Fort Leavenworth Frontier Heritage Communities II, LLC (District Court, Shawnee County, Kansas, No. 2017-cv-000216). • Ambac Assurance Corporation v. Carlisle/ Picatinny Family Housing Limited Partnership (Court of Common Pleas, Cumberland County, Pennsylvania, No. 2015-6348). Ambac Assurance filed a summons on December 15, 2015 and a complaint on January 11, 2016. On February 1, 2016, defendant served its answer. • Ambac Assurance Corporation v. Fort Lee Commonwealth Communities, LLC (Circuit Court, Roanoke City, Virginia, No. CL16000072-00). Ambac Assurance filed this action on January 7, 2016. Defendant served its answer on February 9, 2016. • Ambac Assurance Corporation v. Fort Bliss/White Sands Missile Range Housing LP (District Court, El Paso County, Texas, Cause No. 2016DCV0094). Ambac Assurance filed this action on January 8, 2016. Defendant served its answer on February 11, 2016. Defendant filed a motion for summary judgment on November 16, 2017 on two of its affirmative defenses, including statute of limitations and "Credit Enhancer Default" by virtue of certain orders of the Rehabilitation Court. Ambac Assurance filed a consolidated (i) opposition to Fort Bliss/White Sands’ motion for summary judgment and (ii) counter-motion for partial summary judgment on December 13, 2017. Defendant filed its opposition on January 22, 2018. Ambac Assurance filed its reply brief on January 30, 2018 arguing, among other things, that the Rehabilitation Court’s January 22 Order constituted further grounds for entering summary judgment for Ambac Assurance on the "Credit Enhancer Default" argument. Oral argument on the summary judgment motions has been scheduled for April 27, 2018. On February 7, 2018, the Rehabilitation Court entered a further order enjoining Bliss (among others) from continuing to argue that an Ambac Default occurred by virtue of the Rehabilitation Court's prior orders and requiring Bliss to file that order with the Texas Court. On February 8, 2018, Bliss filed the Rehabilitation Court's January 22 and February 7 orders with the Texas court. | Ambac Financial Group, Inc. 152 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) RMBS Litigation: In connection with Ambac Assurance’s efforts to seek redress for breaches of representations and warranties and fraud related to the information provided by both the underwriters and the sponsors of various transactions and for failure to comply with the obligation by the sponsors to repurchase ineligible loans, Ambac Assurance has filed various lawsuits: • Ambac Assurance Corporation and The Segregated Account of Ambac Assurance Corporation v. First Franklin Financial Corporation, Bank of America, N.A., Merrill Lynch, Pierce, Fenner & Smith Inc., Merrill Lynch Mortgage Lending, Inc., and Merrill Lynch Mortgage Investors, Inc. (Supreme Court of the State of New York, County of New York, Case No. 651217/2012, filed April 16, 2012). Ambac Assurance alleges breach of contract, fraudulent inducement, indemnification, reimbursement and requested the repurchase of loans that breach representations and warranties as required under the contracts, as well as damages. Defendants filed a motion to dismiss on July 13, 2012, which Ambac opposed on September 21, 2012. Oral argument was held on May 6, 2013. On July 18, 2013 the court dismissed Ambac Assurance’s claims for indemnification and limited Ambac Assurance’s claim for breach of loan-level warranties to the repurchase protocol, but did not dismiss Ambac Assurance’s other contractual claims or fraudulent inducement claim. On August 21, 2013, defendants filed a notice of appeal, and on August 30, 2013, Ambac Assurance filed a notice of cross-appeal. On April 22, 2014, the parties filed a stipulation withdrawing defendants’ appeal and Ambac Assurance’s cross-appeal of the court’s July 18, 2013 decision. Discovery is ongoing. • Ambac Assurance Corporation and The Segregated Account of Ambac Assurance Corporation v. Countrywide Securities Corp., Countrywide Financial Corp. (a.k.a. Bank of America Home Loans) and Bank of America Corp. (Supreme Court of the State of New York, County of New York, Case No. 651612/2010, filed on September 28, 2010). Ambac Assurance filed an Amended Complaint on September 8, 2011. Ambac Assurance alleged breach of contract, fraudulent inducement, indemnification and reimbursement, and breach of representations and warranties, requested the repurchase of loans that breach representations and warranties as required under the contracts, as well as damages, and asserted a successor liability claim against Bank of America. On May 28, 2013, Ambac Assurance filed a Second Amended Complaint adding an alter ego claim against Bank of America alleging that, because Bank of America and Countrywide are alter egos of one another, Bank of America is responsible for Countrywide’s liabilities to Ambac. The defendants served their answers on July 31, 2013. Fact and expert discovery has ended. On May 1, 2015, Ambac Assurance filed motions for partial summary judgment, which defendants opposed. Defendants also each filed motions for summary judgment, which Ambac Assurance opposed. The court heard oral argument on July 15, 2015. On October 27, 2015, the court issued a decision dated October 22, 2015 granting in part and denying in part the parties’ respective summary judgment motions regarding Ambac Assurance’s claims against Countrywide (primary- liability claims), and issued a second decision granting Ambac Assurance’s partial motion for summary judgment and denying Bank of America’s motion for summary judgment regarding Ambac Assurance’s secondary-liability claims against Bank of America. Ambac Assurance and Countrywide filed notices of appeal of the October 22, 2015 decision relating to primary liability and Bank of America filed a notice of appeal of the October 27, 2015 decision relating to its secondary-liability to the New York Appellate Division, First Department. On May 16, 2017, the First Department issued rulings in both appeals, reversing a number of rulings that the trial court had made and affirming other rulings. On June 15, 2017, Ambac Assurance filed a motion with the First Department for leave to appeal certain rulings in the May 16, 2017 decision to the Court of Appeals, which Countrywide opposed. On July 25, 2017 the First Department granted Ambac Assurance’s motion. The briefing for the appeal has been completed and oral argument is expected in 2018. • Ambac Assurance Corporation and The Segregated Account of Ambac Assurance Corporation v. Nomura Credit & Capital, Inc. and Nomura Holding America Inc. (Supreme Court of the State of New York, County of New York, Case No. 651359/2013, filed on April 15, 2013). Ambac Assurance alleges claims for material breach of contract and for the repurchase of loans that breach representations and warranties under the contracts, as well as damages. Ambac Assurance has also asserted alter ego claims against Nomura Holding America, Inc. Defendants filed a motion to dismiss on July 12, 2013, which Ambac Assurance opposed. The court held oral argument on November 13, 2013. On September 22, 2014, plaintiffs filed an amended complaint alleging claims for fraudulent inducement, material breach of contract and for the repurchase of loans that breach representations and warranties under the contracts, as well as damages. On October 31, 2014 defendants filed a motion to strike the amended complaint. Ambac Assurance opposed that motion and at the court’s recommendation also filed a cross motion for leave to amend the complaint on November 14, 2014, which the defendants opposed. Defendants filed a motion to dismiss the fraudulent inducement claim, which Ambac Assurance opposed. The court heard oral argument on the defendants’ motion to dismiss the fraudulent inducement claim on April 14, 2015. On June 3, 2015, the court denied defendants’ July 2013 motion to dismiss Ambac’s claim for breaches of representations and warranties, but granted the defendants’ motion to dismiss Ambac’s claims for breach of the repurchase protocol and for alter ego liability against Nomura Holding. On December 29, 2016, the court issued a decision denying Nomura’s motion to strike Ambac’s amended complaint and its motion to dismiss the fraudulent inducement claim. On January 31, 2017, Nomura filed a notice of appeal from that decision. On March 27, 2017, Nomura appealed the June 2015 decision to the extent it denied its motion to dismiss and filed its opening appellate brief. Ambac Assurance opposed that appeal. On December 7, 2017, the First Department affirmed the trial court’s June 3, 2015 decision. Discovery is ongoing. • The Segregated Account of Ambac Assurance Corporation and Ambac Assurance Corporation v. Countrywide Home Loans, Inc. (Wisconsin Circuit Court for Dane County, Case No 14 CV 3511, filed on December 30, 2014). Ambac Assurance alleges a claim for fraudulent inducement in connection with Ambac Assurance’s issuance of insurance policies relating to five residential mortgage-backed securitizations that are not the subject of Ambac Assurance’s previously filed lawsuit against the same defendant. Defendant filed a motion | Ambac Financial Group, Inc. 153 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) to dismiss the complaint on February 20, 2015, which Ambac Assurance opposed. The court heard oral argument on two of Countrywide’s grounds for dismissal on June 23, 2015, and indicated that it would dismiss the Wisconsin Action without prejudice for lack of personal jurisdiction. The court issued an order to that effect on July 2, 2015. Ambac Assurance appealed the July 2, 2015 order. On June 23, 2016, the Wisconsin Court of Appeals reversed the trial court’s dismissal of the complaint, and on October 11, 2016, the Wisconsin Supreme Court granted Countrywide’s petition for review of the June 23 decision by the Wisconsin Court of Appeals. The Wisconsin Supreme Court appeal was argued on February 28, 2017. On June 30, 2017, the Wisconsin Supreme Court reversed the decision of the Wisconsin Court of Appeals and remanded the case to the Wisconsin Court of Appeals for further proceedings. On December 14, 2017, the Wisconsin Court of Appeals affirmed the trial court’s July 2, 2015 decision dismissing the case for lack of personal jurisdiction. On January 16, 2018, Ambac Assurance filed a petition with the Supreme Court of Wisconsin for review of the December 14, 2017 decision. On January 30, 2018, Countrywide opposed the petition. On June 30, 2015, plaintiffs filed a Summons with Notice in the Supreme Court of the State of New York, County of New York, No. 652321/15 (the “2015 New York Action”), alleging claims identical to the Wisconsin Action. On July 21, 2015, plaintiffs filed a complaint in the 2015 New York Action and a motion to stay the 2015 New York Action pending appeal and litigation of the Wisconsin Action. On August 5, 2015, Countrywide filed its opposition to plaintiffs’ motion to stay and on August 10, 2015, Countrywide filed a motion to dismiss the complaint, which Ambac opposed. The court held oral argument in November 2015 and on September 20, 2016 granted Ambac Assurance’s motion to stay. Countrywide’s motion to dismiss the complaint is held in abeyance pending resolution of the Wisconsin Action. • Ambac Assurance Corporation and the Segregated Account of Ambac Assurance Corporation v. Countrywide Home Loans, Inc., Countrywide Securities Corp., Countrywide Financial Corp., and Bank of America Corp. (Supreme Court of the State of New York, County of New York, Case No. 653979/2014, filed on December 30, 2014). Ambac Assurance alleges a claim for fraudulent inducement in connection with Ambac Assurance’s issuance of insurance policies relating to eight residential mortgage-backed securitizations that are not the subject of Ambac Assurance’s previously filed lawsuits against the same defendants. On February 20, 2015, the Countrywide defendants filed a motion to dismiss the complaint, which Bank of America joined on February 23, 2015. Ambac Assurance opposed the motion. On December 20, 2016, the court issued a decision denying the defendants’ motion to dismiss. Discovery is ongoing. Ambac Assurance Corporation and The Segregated Account of Ambac Assurance Corporation v. U.S. Bank National Association (United States District Court, Southern District of New York, Docket No. 17-cv-00446 (SHS), filed January 20, 2017). Ambac Assurance commenced this action to enjoin the defendant from accepting a proposed settlement in a separate litigation that the defendant is prosecuting, as trustee, in connection with a residential mortgage-backed securitization for which Ambac Assurance issued an insurance policy. Ambac Assurance alleges claims for declaratory judgment, breach of contract, breach of fiduciary duty, and violation of the Streit Act. On February 14, 2017, plaintiffs filed an amended complaint asserting additional claims for declaratory judgment and breach of contract related to the defendant’s treatment of trust recoveries. On February 23, 2017, plaintiffs filed a second amended complaint to reflect a revised settlement offer, and also filed a motion for a preliminary injunction, which U.S. Bank opposed. On March 9, 2017, U.S. Bank filed a motion to dismiss the second amended complaint, which plaintiffs opposed. The court heard oral argument on plaintiffs’ motion for a preliminary injunction and U.S. Bank’s motion to dismiss on April 24, 2017. On June 1, 2017, the court denied U.S. Bank’s motion to dismiss and denied plaintiffs’ motion for a preliminary injunction. U.S. Bank filed a motion for reconsideration of the court’s denial of its motion to dismiss, which plaintiffs opposed. On December 6, 2017, the court granted the motion for reconsideration and granted U.S. Bank’s motion to dismiss, and on January 18, 2018, the court issued an opinion memorializing the reasons for its decision. On March 6, 2017, U.S. Bank filed a trust instruction proceeding in Minnesota state court concerning the proposed settlement, which is captioned, In the matter of HarborView Mortgage Loan Trust 2005-10, No. 27-TR-CV-17-32 (the “Minnesota Action”). On April 5, 2017, Ambac Assurance filed a motion to dismiss the Minnesota Action. On June 12, 2017, U.S. Bank filed an amended petition in the Minnesota Action and on July 7, 2017, Ambac Assurance renewed its motion to dismiss, which U.S Bank opposed. On November 13, 2017, the court denied the motion to dismiss the proceeding. On February 7, 2018, Ambac Assurance appealed this dismissal. Additionally, certain certificate holders have objected or otherwise responded to the petition filed by U.S. Bank. • Ambac Assurance Corporation and The Segregated Account of Ambac Assurance Corporation v. U.S. Bank National Association (United States District Court, Southern District of New York, Docket No. 17-cv-02614, filed April 11, 2017). Ambac Assurance alleges claims for breach of contract, breach of fiduciary duty, declaratory judgment, and violation of the Streit Act in connection with defendant’s failure to enforce rights and remedies and defendant’s treatment of trust recoveries, as trustee of five residential mortgage-backed securitizations for which Ambac Assurance issued insurance policies. On September 15, 2017, U.S. Bank filed a motion to dismiss, which Ambac Assurance opposed on October 13, 2017. Oral argument on that motion was held on November 17, 2017. The motion remains pending. Other Litigation U.S. Securities and Exchange Commission (the “SEC”) v. Citigroup Global Markets Inc. (“Citigroup”) (United States District Court Southern District of New York, Docket No. 11-CV-7387, filed in October 2011). This suit related to a collateralized debt obligation transaction arranged by Citigroup where Ambac Credit Products, LLC (insured by Ambac Assurance) provided credit protection through a credit default swap to a bank counterparty that was exposed to the transaction. The SEC and Citigroup reached a settlement of this action for $285,000. The presiding judge approved the settlement in August of 2014. A fair fund has been established to distribute the $285,000 (plus $2,550 received from a related proceeding). RCB Fund Services (the “Distribution Agent”) has been appointed as distribution agent for the fund and has invited | Ambac Financial Group, Inc. 154 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) investor participants in the CDO transaction to provide information regarding their investments in the CDO transaction. Ambac Assurance filed a submission with the requested information on February 28, 2018. The Distribution Agent, in consultation with the SEC, will then develop a distribution plan for the fair fund, which will be filed with the Court and will be subject to a comment period. While there can be no assurance as what the Distribution Plan will provide, or the timing or substance of what the Court will decide, Ambac Assurance expects to receive a significant portion of the settlement funds. Ambac has not recorded any receivable for its estimated portion of these settlement funds 17. SUBSEQUENT EVENTS As more fully discussed in Note 1. Background and Business Description, on February 12, 2018: • the Second Amended Plan of Rehabilitation became effective and a series of transactions were consummated which provided holders of beneficial interests in Deferred Amounts (other than Ambac, but including Ambac Assurance) a total effective consideration package, in full satisfaction and discharge of each $1.00 of Deferred Amounts (including accretion), of (i) $0.40 in cash, (ii) $0.41 in principal amount of new Secured Notes and (iii) from certain holders of surplus notes, $0.125 currently outstanding surplus notes. Such consideration package provided a discount of $0.065 (set first against accretion of Deferred Amounts). Ambac received $0.91 in principal amount of Secured Notes for each $1.00 of Deferred Amounts (including accretion) that it held, and provided a $0.09 discount in full satisfaction and discharge of its Deferred Amount claims. This transaction is being accounted for as an extinguishment of Deferred Amounts and the discount of approximately $288,000 from the settlement will be reflected as a benefit to loss and loss expenses in the Consolidated Statements of Comprehensive Income (Loss) in the quarter ended March 31, 2018. • the Exchange Offers were consummated, pursuant to which holders of surplus notes received the same effective package as holders of beneficial interests in Deferred Amounts, including the discount of $0.065 in principal amount and accrued and unpaid interest on the surplus notes tendered; resulting in Ambac Assurance's cancellation of $809,520 of principal and accrued and unpaid interest of general account surplus notes. The Exchange Offers will be accounted for as a debt modification since the creditors before and after the discount remain the same and the change in the terms is not considered substantial. A substantial change is considered to be a change in cash flows of equal to or greater than 10% as a result of the modification of terms. As the change in cash flows is less than 10%, debt modification accounting is appropriate. Under debt modification accounting, no gain or loss is recorded, and a new effective interest rate is established based on the cash flows of the Ambac Note, which secures the Secured Notes issued as part of the Exchange Offers. Additionally, any consideration paid that is directly related to the issuance of the Ambac Note is capitalized and amortized as part of the effective yield calculation. • in connection with the Rehabilitation Exit Transactions, Ambac Assurance is making a one-time current interest payment on remaining surplus notes (other than junior surplus notes) of $13,501, of which $2,618 will be received by Ambac. • Ambac Assurance issued $240,000 of new debt secured by certain of Ambac Assurance’s rights to representation and warranty subrogation recoveries above $1,600,000 ("Tier 2 Notes"). The proceeds received from this issuance were used to fund the cash portion of the consideration paid pursuant to the Second Amended Plan of Rehabilitation and Exchange Offers. • Ambac will incur operating expenses in the first quarter of 2018 for its and the OCI's financial advisors that is approximately $14,000. In order to execute these transactions, Ambac established a special purpose entity, Ambac LSNI, LLC, for the sole purpose of the issuance of Secured Notes. Ambac Assurance will not consolidate Ambac LSNI, LLC and will receive $768,464 par amount of the Secured Notes, which will be held in Ambac's investment portfolio. Ambac's invested assets and cash will be reduced by the total cash outflow of approximately $1,353,560 and Ambac will experience reductions in the value of Ambac-insured RMBS securities held in the investment portfolio. Ambac Assurance will record the principal amount of long-term debt for the Ambac Note of $2,154,351 and the Tier 2 Notes of $240,000. The key terms of these instruments are as follows: • The Ambac Note (and Secured Notes) will accrue interest at a per annum rate of 3-month U.S. Dollar LIBOR plus 5.00%, subject to a 1.00% LIBOR floor. Accrued and unpaid interest will be paid in cash on each payment date (quarterly on the last day of each quarter beginning with June 30, 2018) until the maturity date. The maturity date for the Secured Notes and the Ambac Note will be the earlier of (x) February 12, 2023, and (y) if the Secured Notes are then outstanding, the date that is five business days prior to the date for which OCI has approved the repayment of the outstanding principal amount of the surplus notes (other than junior surplus notes) issued by Ambac Assurance. Promptly, and in any event within four business days after the receipt (whether directly or indirectly) of any representation and warranty subrogation recoveries, Ambac Assurance shall (i) apply an amount (the “Mandatory Redemption Amount”) equal to the lesser of (a) the amount of such RMBS proceeds and (b) all outstanding principal and accrued and unpaid interest on the Ambac Note to redeem the Ambac Note, in whole or in part, as applicable; provided, that any non-cash RMBS proceeds shall be deemed to be received upon the receipt of the applicable appraisal. Redemptions or prepayments of the Ambac Note will result in corresponding redemptions or prepayments of the Secured Notes. | Ambac Financial Group, Inc. 155 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES Notes to Consolidated Financial Statements (Dollar Amounts in Thousands, Except Share Amounts) • The Tier 2 Notes will mature in 2055 and shall bear interest at a rate of 8.50% per annum, calculated on a 30/360 basis. Interest payments will not be made in cash on interest payment dates and shall be paid-in-kind and compounded on the last day of each calendar quarter, unless (i) funds are available to make such payments in cash as a result of receiving recoveries in respect of the representation and warranty subrogation recoveries in excess of $1,600,000 or (ii) interest is paid in cash on surplus notes (other than in connection with the Exchange Offers and Second Amended Plan of Rehabilitation). The Tier 2 Notes may not be redeemed or repaid prior to December 17, 2020, unless Ambac Assurance pays a make-whole premium. Thereafter, the Tier 2 Notes may be redeemed, in whole or in part, at the option of Ambac Assurance, at a price equal to 100% of the aggregate principal amount redeemed, plus accrued and unpaid interest, if any. 18. QUARTERLY INFORMATION (Unaudited) Net gains (losses) on interest rate derivatives (1,514) 34,068 ($ in thousands) Gross premiums written Net premiums earned Net investment income Net other than temporary impairment losses Net realized investment gains (losses) Net change in fair value of credit derivatives Net realized gains (losses) on extinguishment of debt Income (loss) on Variable Interest Entities Losses and loss expenses (benefit) Insurance intangible amortization Operating expenses Interest expense Pre-tax income (loss) Net income (loss) attributable to Common Shareholders Net income (loss) per share: 2017 2016 First Quarter Second Quarter Third Quarter Fourth Quarter First Quarter Second Quarter Third Quarter Fourth Quarter $ 5,584 $ 6,928 $ (24,696) $ (2,129) $ (24,780) $ (4,041) $ (10,543) $ (14,473) 47,613 81,559 (3,942) (4,896) 1,052 43,152 85,160 52,989 87,177 31,523 107,057 52,800 60,821 41,402 70,758 53,218 90,917 49,867 90,871 (1,763) (13,510) (9,334) (7,441) (2,853) (2,191) 4,180 6,624 6,150 179 3,984 (956) (68) 8,517 23,027 1,102 12,866 14,897 3,955 11,749 1,733 (83,424) (36,331) (14,510) 2,741 3,701 135,011 37,525 27,980 31,572 (105,860) 2,179 (1,219) 66,100 33,471 31,051 28,234 13,992 — — 1,235 (4,049) 21,237 (27,163) 3,586 8,987 24 2,057 209,806 102,269 (105,281) (52,496) (69,204) 215,492 45,690 33,791 29,145 34,168 28,694 30,990 (185,466) (6,917) 50,890 28,009 30,430 12,854 39,013 27,995 30,709 61,511 44,553 21,466 31,493 40,152 36,190 31,712 116,720 (86,059) $ (125,441) $ 7,110 $ (190,905) $ (19,479) $ 9,415 $ 58,647 $ 101,474 $ (94,693) 11,536 1,552 83,992 — 2,026 Basic Diluted $ $ (2.77) $ (2.77) $ 0.16 0.16 $ $ (4.20) $ (0.43) $ (4.20) $ (0.43) $ 0.21 0.21 $ $ 1.30 1.29 $ $ 2.24 2.22 $ $ (2.09) (2.09) | Ambac Financial Group, Inc. 156 2017 FORM 10-K | Item 9. Changes Accountants on Accounting and Financial Disclosure. in and Disagreements with None. Item 9A. Controls and Procedures. Evaluation of Disclosure Controls and Procedures. Ambac’s disclosure controls and procedures are designed to ensure that information required to be disclosed under the Securities Exchange Act of 1934, as amended, is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, including without limitation that information required to be disclosed by Ambac in its SEC filings is accumulated and communicated to management, including the Chief Executive Officer (CEO) and Chief Financial Officer (CFO) as appropriate to allow for timely decisions regarding required disclosure. Ambac’s Disclosure Committee assists the CEO and CFO in their responsibilities to design, establish, maintain and evaluate the effectiveness of disclosure controls and procedures. The Disclosure Committee is responsible for, among other things, the oversight, maintenance and implementation of the disclosure controls and procedures, subject to the supervision and oversight of the CEO and CFO. Ambac’s management, with the participation of its CEO and CFO, has evaluated the effectiveness of Ambac’s disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934) as of December 31, 2017 and, the CEO and CFO have concluded that at that date Ambac’s disclosure controls and procedures were effective at the reasonable assurance level. Management’s Report on Internal Control Over Financial Reporting. Management of Ambac is responsible for establishing and maintaining adequate internal control over financial reporting. Ambac’s internal control over financial reporting is a process designed under the supervision of the CEO and CFO and overseen by Ambac’s Board of Directors to provide reasonable assurance regarding the reliability of financial reporting and the preparation of Ambac’s financial statements for external reporting purposes in accordance with U.S. generally accepted accounting principles. Ambac’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of assets of Ambac; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with U.S. generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of Ambac; and (iii) provide reasonable assurance regarding the prevention or timely detection and remediation of unauthorized acquisition, use or disposition of Ambac’s assets that could have a material effect on the financial statements. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. Ambac management conducted an assessment of the effectiveness of Ambac’s internal control over financial reporting based on the criteria established in the 2013 Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Ambac management has concluded that, as of December 31, 2017, our internal control over financial reporting was effective based on the criteria articulated in the 2013 Internal Control - Integrated Framework. The effectiveness of our internal control over financial reporting as of December 31, 2017 has been audited by KPMG LLP, an independent registered public accounting firm, as stated in their report, which expressed an unqualified opinion on the effectiveness of Ambac’s internal control over financial reporting. Changes in Internal Control Over Financial Reporting. There were no changes in the Company’s internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fourth quarter of 2017 that have materially affected, or are reasonably likely to materially affect, Ambac's internal control over financial reporting. Item 9B. Other Information Appointment of New Director. The Board of Directors of the Company appointed Joan Lamm-Tennant to both the Ambac Board and Ambac Assurance Board effective March 1, 2018. A copy of the Company’s press release announcing this information is being filed as exhibit 99.5 to this Annual Report on Form 10-K. Ms. Lamm-Tennant has also been appointed as a member of the Audit Committee and Strategy and Risk Policy Committee of the Board. PART III Item 10. Directors, Executive Officers and Corporate Governance Information relating to Ambac’s executive officers and directors, including its audit committee and audit committee financial experts will be in Ambac’s definitive Proxy Statement for its 2018 Annual Meeting of Stockholders which will be filed within 120 days of the end of our fiscal year ended December 31, 2017 (the “2018 Proxy Statement”) and is incorporated herein by reference. Ambac has a Code of Business Conduct which promotes management’s control philosophy and expresses the values which govern employee behavior and help maintain Ambac’s commitment to the highest standards of conduct. This code can be found on Ambac’s website at www.ambac.com on the “Investor Relations” page under “Corporate Governance.” Ambac will disclose on its website any amendment to, or waiver from, a provision of its Code of Business Conduct that applies to its Chief Executive Officer, Chief Financial Officer or Chief Accounting Officer. Ambac’s corporate governance guidelines and the charters for the committees of the Board of Directors are also available on our website under the “Corporate Governance” page. Item 11. Executive Compensation. Information relating to Ambac’s executive officer and director compensation will be in the 2018 Proxy Statement and is incorporated herein by reference. | Ambac Financial Group, Inc. 157 2017 FORM 10-K | Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters. Information relating to security ownership of certain beneficial owners of Ambac’s common stock and information relating to the security ownership of Ambac’s management will be in the 2018 Proxy Statement and is incorporated herein by reference. Equity Compensation Plan Information The following table provides information as of December 31, 2017 regarding securities issued under our 2013 Incentive Compensation Plan. Equity compensation plans approved by security holders Equity compensation plans not approved by security holders Total Plan Category 2013 Incentive Compensation Plan (1) None Number of Securities to be Issued Upon Exercise of Outstanding Options, Warrants and Rights Weighted-Average Exercise Price of Outstanding Options, Warrants and Rights Number of Securities Remaining Available for Future Issuance Under Equity Compensation Plans (Excluding Securities Reflected in the Third Column) 959,356 (2) (3) --- 959,356 (2) (3) $24.03 (4) --- $24.03 (4) 2,793,323 --- 2,793.323 (1) Our 2013 Incentive Compensation Plan was approved by the stockholders of Ambac on December 18, 2013. The total number of shares of Ambac common stock available for issuance under the 2013 Incentive Compensation Plan is 4,000,000. (2) Represents, as of December 31, 2017, the number of outstanding restricted stock unit awards, stock options and the maximum number of performance stock units that may be issued if certain performance goals are achieved. Refer to Note 15. Employment Benefit Plans to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K for a description of the grants made under the 2013 Incentive Compensation Plan. This amount includes 221,803 restricted stock units, 126,667 options and 610,886 performance stock units which are based on the maximum number of shares potentially payable under the awards. (3) Each restricted stock unit, stock option and performance stock unit awarded under our 2013 Incentive Compensation Plan was granted at no cost to the persons receiving them. Restricted stock units represent the contingent right to receive the equivalent number of shares of Ambac common stock and may vest after the passage of time, or the achievement of a corporate goal, or both. Stock options represent the right to acquire an equivalent number of shares of Ambac common stock at a specified exercise price. Performance stock units granted pursuant to the Company's Long Term Incentive Plan represent the contingent right to receive a number of shares of Ambac common stock ranging from 0% to 200% of the number of units granted depending upon the achievement of certain company-wide performance goals. (4) Reflects the weighted-average price of all outstanding options that had been granted but not forfeited, expired or exercised. Performance shares and restricted stock units are not included in determining the weighted-average price as they have no exercise price. Item 13. Transactions, and Director Independence. Certain Relationships and Information relating to Ambac with respect to certain relationships and related transactions and director independence will be in the 2018 Proxy Statement and is incorporated herein by reference. related Item 14. Principal Accountant Fees and Services. Information relating to principal accountant fees and services will be in the 2018 Proxy Statement and is incorporated herein by reference. Item 15. Exhibits, Financial Statement Schedules (a) Documents filed as a part of this report: 1. Financial Statements PART IV The consolidated financial statements included in Part II, Item 8 above are filed as part of this Annual Report on Form 10-K. 2. Financial Statement Schedules The financial statement schedules filed herein, which are the only schedules required to be filed, are as follows: Schedule I — Summary of Investments Other Than Investments in Related Parties ........................................................ Schedule II — Condensed Financial Information of Registrant (Parent Company Only) ................................................. Schedule IV — Reinsurance............................................................................................................................................... Page 163 164 169 | Ambac Financial Group, Inc. 158 2017 FORM 10-K | (b) Exhibits (3) Articles of Incorporation and bylaws: 3.1 3.2 Amended and Restated Certificate of Incorporation of Ambac Financial Group, Inc. (incorporated by reference to Exhibit 3.1 to Form 8-A, filed on May 1, 2013). Amended By-laws of Ambac Financial Group, Inc. (filed as Exhibit 3.2 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference). (4) Instruments defining the rights of security holders, including indentures: 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15 4.16 Specimen form of common stock certificate (incorporated by reference to Exhibit 4.1 to Form 8-A, filed on May 1, 2013). Warrant Agreement between Ambac Financial Group, Inc. and Computershare Inc. (incorporated by reference to Exhibit 4.2 to Form 8-A, filed on May 1, 2013). Specimen form of warrant certificate (included in Exhibit 4.2). Junior Note Fiscal Agency Agreement, dated as of April 30, 2013, by and between the Segregated Account of Ambac Assurance Corporation and The Bank of New York Mellon, as fiscal agent (filed as Exhibit 4.5 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference). 5.1% Junior Surplus Note due June 7, 2020 in the aggregate amount of $350 million issued by the Segregated Account of Ambac Assurance Corporation pursuant to the Junior Note Fiscal Agency Agreement, dated as of April 30, 2013 (filed as Exhibit 4.6 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, Form of 5.1% Non-Reducing Junior Surplus Note due June 7, 2020 issued by the Segregated Account of Ambac Assurance Corporation (filed as Exhibit 4.7 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference). Form of 5.1% Bankruptcy Reducing Junior Surplus Note due June 7, 2020 issued by the Segregated Account of Ambac Assurance Corporation (filed as Exhibit 4.8 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference). Form of 5.1% Reducing Junior Surplus Note due June 7, 2020, issued by the Segregated Account of Ambac Assurance Corporation (filed as Exhibit 4.9 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference). Fiscal Agency Agreement, dated as of July 19, 2010, by and between the Segregated Account of Ambac Assurance Corporation and The Bank of New York Mellon, as fiscal agent (filed as Exhibit 4.10 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference). Form of Surplus Note due June 7, 2020 issued by the Segregated Account of Ambac Assurance Corporation.(included in Exhibit 4.9). Fiscal Agency Agreement, dated as of June 7, 2010, by and between Ambac Assurance Corporation and The Bank of New York Mellon, as fiscal agent (filed as Exhibit 10.3 to Ambac Financial Group, Inc.’s Current Report on Form 8- K filed June 8, 2010 and incorporated herein by reference). Amendment dated as of October 3, 2014 to Fiscal Agency Agreement dated as of June 7, 2010 by and between Ambac Assurance Corporation and The Bank of New York Mellon, as fiscal agent (filed as Exhibit 4.1 to Ambac Financial Group, Inc.'s Quarterly Report on Form 10-Q for the quarter ended September 30, 2015 and incorporated herein by reference). Indenture (including the form of Notes), dated as of February 12, 2018, between Ambac LSNI, LLC and The Bank of New York Mellon, as trustee and note collateral agent, providing for the issuance of insured secured notes (filed as exhibit 4.1 to Ambac Financial Group, Inc.'s Current Report on Form 8-K filed February 15, 2018 and incorporated herein by reference). Indenture (including the form of Notes), dated as of February 12, 2018, between Ambac LSNI, LLC and The Bank of New York Mellon, as trustee and note collateral agent, providing for the issuance of insured secured notes (filed as exhibit 4.2 to Ambac Financial Group, Inc.'s Current Report on Form 8-K filed February 15, 2018 and incorporated herein by reference). Indenture (including the form of Notes), dated as of February 12, 2018, between Ambac Assurance Corporation and The Bank of New York Mellon, as trustee and note collateral agent providing for the issuance of senior notes secured by certain interests in proceeds of certain RMBS litigation (filed as exhibit 4.3 to Ambac Financial Group, Inc.'s Current Report on Form 8-K filed February 15, 2018 and incorporated herein by reference). Supplemental Fiscal Agency Agreement, dated as of February 12, 2018, among the Segregated Account of Ambac Assurance Corporation, Ambac Assurance Corporation and The Bank of New York Mellon, as fiscal agent (filed as exhibit 4.4 to Ambac Financial Group, Inc.'s Current Report on Form 8-K filed February 15, 2018 and incorporated herein by reference). (10) Material contract and management compensation plans and arrangements: 10.1 10.2 10.3 Amended and Restated Trust Agreement dated as of August 28, 2014, among Ambac Financial Group, Inc., The Bank of New York Mellon, and Wilmington Trust, National Association (filed as exhibit 99.2 to Ambac Financial Group, Inc.’s Current Report on Form 8-K filed August 28, 2014 and incorporated herein by reference). Long-Term Incentive Compensation Agreement dated as of May 9, 2014 between Ambac Financial Group, Inc. and David Trick (filed as Exhibit 10.3 to Ambac Financial Group Inc.'s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014 and incorporated herein by reference). Long-Term Incentive Compensation Agreement dated as of May 9, 2014 between Ambac Financial Group, Inc. and Robert B. Eisman (filed as Exhibit 10.4 to Ambac Financial Group, Inc.'s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014 and incorporated herein by reference). | Ambac Financial Group, Inc. 159 2017 FORM 10-K | (b) Exhibits 10.4 10.5 10.6 10.7 10.8 10.9 10.10 10.11 10.12 10.13 10.14 10.15 10.16 10.17 10.18 10.19 10.20 10.21 10.22 10.23 10.24 10.25+ Ambac Financial Group, Inc.'s Long-Term Incentive Compensation Plan (filed as Exhibit 10.1 to Ambac Financial Group, Inc.'s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014 and incorporated herein by reference). Ambac Financial, Group, Inc.’s Incentive Compensation Plan (filed as Appendix A to Ambac Financial Group’s 2013 Definitive Proxy Statement on Schedule DEF 14A filed on November 8, 2013 and incorporated herein by reference). Form of Amended and Restated Restricted Stock Unit Award Letter for executive officers (filed as Exhibit 10.4 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference). Form of Equity Award Letter for directors (filed as Exhibit 10.5 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference). Closing Agreement between Ambac Financial, Group, Inc. and Commissioner of Internal Revenue, dated April 30, 2013 (filed as Exhibit 10.2 to Ambac Financial Group, Inc.’s Current Report on Form 8-K, filed on May 3, 2013 and incorporated herein by reference). Amendment No. 1, dated April 29, 2013, to the Amended and Restated Tax Sharing Agreement among Ambac Financial Group, Inc. and certain of its affiliates (filed as Exhibit 10.1 to Ambac Financial Group, Inc.’s Current Report on Form 8-K, filed on May 3, 2013 and incorporated herein by reference). Tax Sharing Agreement dated March 14, 2012 among Ambac Financial Group, Inc. and certain of its affiliates (filed as Exhibit 10.12 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference). Form of Amendment No. 1 to Cooperation Agreement between the Segregated Account of Ambac Assurance Corporation and Ambac Assurance Corporation (filed as Exhibit 10.3 to Ambac Financial Group, Inc.’s Current Report on Form 8- K filed September 27, 2011 and incorporated herein by reference). Form of Expense Sharing and Cost Allocation Agreement among Ambac Assurance Corporation, Ambac Financial Group, Inc. and their respective subsidiaries and affiliates (filed as Exhibit 10.2 to Ambac Financial Group, Inc.’s Current Report on Form 8-K filed September 27, 2011 and incorporated herein by reference). Mediation Agreement dated September 21, 2011 among Ambac Financial Group, Inc., Ambac Assurance Corporation, the statutory committee of creditors appointed by the United States Trustee on November 17, 2010, the Segregated Account of Ambac Assurance Corporation, the Rehabilitator of the Segregated Account, and OCI (filed as Exhibit 10.1 to Ambac Financial Group, Inc.’s Current Report on Form 8-K filed September 27, 2011 and incorporated herein by Lease, dated as of March 1, 2011, by and between One State Street, LLC and Ambac Assurance Corporation (filed as Exhibit 10.34 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2010 and incorporated herein by reference). Settlement, Discontinuance and Release Agreement, dated as of March 1, 2011, by and among One State Street, LLC, Ambac Financial Group, Inc., Ambac Assurance Corporation and the Segregated Account of Ambac Assurance Corporation (filed as Exhibit 10.33 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2010 and incorporated herein by reference). Settlement Agreement, dated as of June 7, 2010, by and among Ambac Assurance Corporation, Ambac Credit Products LLC, Ambac Financial Group, Inc. and the parties listed on Schedule A thereto (filed as Exhibit 10.1 to Ambac Financial Group, Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 and incorporated herein by Ambac Financial Group, Inc. Severance Pay Plan (Applicable to termination on or after January 1, 2010) (filed as Exhibit 10.26 to Ambac Financial Group, Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2010 and incorporated herein by reference). Management Services Agreement, dated as of March 24, 2010, by and between the Segregated Account of Ambac Assurance Corporation and Ambac Assurance Corporation (filed as Exhibit 10.22 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2009 and incorporated herein by reference). Cooperation Agreement, dated as of March 24, 2010, by and between the Segregated Account of Ambac Assurance Corporation and Ambac Assurance Corporation (filed as Exhibit 10.23 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2009 and incorporated herein by reference). Aggregate Excess of Loss Reinsurance Agreement, dated as of March 24, 2010, by and between the Segregated Account of Ambac Assurance Corporation and Ambac Assurance Corporation (filed as Exhibit 10.24 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2009 and incorporated herein by reference). Secured Note, dated as of March 24, 2010, from Ambac Assurance Corporation to the Segregated Account of Ambac Assurance Corporation (filed as Exhibit 10.25 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2009 and incorporated herein by reference). Lease Modification dated as of September 8, 2015 to the Lease dated as of March 1, 2011, by and between One State Street, LLC and Ambac Assurance Corporation (filed as Exhibit 10.27 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2015 and incorporated herein by reference). Form of 2015 Long-Term Incentive Compensation Agreement between Ambac Financial Group, Inc. and each of the Company's executive officers (filed as Exhibit 10.28 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2015 and incorporated herein by reference). Form of 2016 Long-Term Incentive Compensation Agreement between Ambac Financial Group, Inc. and each of the Company's executive officers (filed as Exhibit 10.27 to Ambac Financial Group, Inc.'s Annual Report on Form 10-K for the year ended December 31, 2016 and incorporated herein by reference). Form of 2017 Long-Term Incentive Compensation Agreement between Ambac Financial Group, Inc. and each of the Company's executive officers. | Ambac Financial Group, Inc. 160 2017 FORM 10-K | (b) Exhibits 10.26 10.27 10.28 10.29 10.30 10.31 10.32 10.33 10.34 10.35 10.36 10.37 10.38 10.39 10.40 Voting Support Settlement Agreement, dated as of March 28, 2016, by and between Ambac Financial Group, Inc. and Cornwall Master LP (filed as Exhibit 10.3 to Ambac Financial Group, Inc.’s Current Report on Form 8-K filed on March 29, 2016 and incorporated herein by reference). Employment Agreement dated as of November 1, 2016 by and among Ambac Financial Group, Inc., Ambac Assurance Corporation and David Trick (filed as Exhibit 10.2 to Ambac Financial Group, Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2016 and incorporated herein by reference). Employment Agreement dated as of December 8, 2016, by and among Ambac Financial Group, Inc., Ambac Assurance Corporation and Claude LeBlanc (filed as Exhibit 10.1 to Ambac Financial Group, Inc.’s Current Report on Form 8-K filed on December 13, 2016 and incorporated herein by reference). Employment Agreement dated as of January 4, 2017 by and among Ambac Financial Group, Inc., Ambac Assurance Corporation and Stephen Ksenak (filed as Exhibit 10.1 to Ambac Financial Group, Inc.’s Current Report on Form 8-K filed on January 6, 2017 and incorporated herein by reference). Rehabilitation Exit Support Agreement, by and among Ambac Assurance Corporation, Ambac Financial Group, Inc. and certain holders of Ambac Assurance Corporation’s 5.1% Surplus Notes due 2020 and certain holders of Ambac Assurance Corporation’s deferred payment obligations, dated as of July 19, 2017 (filed as Exhibit 10.1 to Ambac Financial Group, Inc.’s Current Report on Form 8-K filed on July 19, 2017 and incorporated herein by reference). Tier 2 Commitment Letter, dated as of July 19, 2017 from funds affiliated with or managed by investors party thereto (filed as Exhibit 10.2 to Ambac Financial Group, Inc.’s Current Report on Form 8-K filed on July 19, 2017 and incorporated herein by reference). First Amendment to the Rehabilitation Exit Support Agreement, by and among Ambac Assurance Corporation, Ambac Financial Group, Inc. and certain holders of Ambac Assurance Corporation’s 5.1% Surplus Notes due 2020 and certain holders of Ambac Assurance Corporation’s deferred payment obligations, dated as of September 21, 2017 (filed as Exhibit 10.1 to Ambac Financial Group, Inc.’s Current Report on Form 8-K filed on September 26, 2017 and incorporated herein by reference). Financial Guaranty Insurance Policy, dated February 12, 2018, issued by Ambac Assurance Corporation (filed as exhibit 10.1 to Ambac Financial Group, Inc.'s Current Report on Form 8-K filed February 15, 2018 and incorporated herein by reference). Collateral Agreement, dated as of February 12, 2018, made by Ambac LSNI, LLC in favor of The Bank of New York Mellon, as note collateral agent, trustee and paying agent for the secured parties (filed as exhibit 10.2 to Ambac Financial Group, Inc.'s Current Report on Form 8-K filed February 15, 2018 and incorporated herein by reference). Pledge Agreement, dated as of February 12, 2018, made by Ambac Assurance Corporation in favor of The Bank of New York Mellon, as note collateral agent, trustee and paying agent (filed as exhibit 10.3 to Ambac Financial Group, Inc.'s Current Report on Form 8-K filed February 15, 2018 and incorporated herein by reference). Collateral Agreement, dated as of February 12, 2018, made by Ambac Assurance Corporation in favor of The Bank of New York Mellon, as note collateral agent, trustee and paying agent for the secured parties (filed as exhibit 10.4 to Ambac Financial Group, Inc.'s Current Report on Form 8-K filed February 15, 2018 and incorporated herein by reference). Waiver and Amendment, dated as of February 12, 2018, among Ambac Assurance Corporation, Ambac Credit Products, LLC, Ambac Financial Group, Inc. and the other signatories party thereto (filed as exhibit 10.5 to Ambac Financial Group, Inc.'s Current Report on Form 8-K filed February 15, 2018 and incorporated herein by reference). Second Amended Plan of Rehabilitation of the Segregated Account of Ambac Assurance Corporation dated September 25, 2017, and effective as of February 12, 2018. Order Granting the Rehabilitator’s Motion to Further Amend the Plan of Rehabilitation and confirming the Second Amended Plan of Rehabilitation, as amended, Case No. 10-CV-1576 (Dane County, Wisconsin) dated January 22, 2018. Stipulation and Order - Office of the Commissioner of Insurance of the State of Wisconsin, in the Matter of the Rehabilitation of the Segregated Account of Ambac Assurance Corporation effective as of February 12, 2018. (99) Additional exhibits 99.1 99.2 99.3 99.4 99.5 Amendment dated as June 12, 2014 to the Plan of Rehabilitation of the Segregated Account of Ambac Assurance Corporation (filed as Exhibit 99.1 to Ambac Financial Group, Inc.'s Quarterly Report on Form 10-Q for the quarter ended September 30, 2014 and incorporated herein by reference.) Second Modified Fifth Amended Plan of Reorganization of Ambac Financial Group, Inc., effective as of May 1, 2013 (filed as Exhibit 99.3 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2013 and incorporated herein by reference). Plan of Rehabilitation of the Segregated Account of Ambac Assurance Corporation. (Filed as Exhibit 99.2 to Ambac Financial Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2010 and incorporated herein by reference.) Plan of Operation of the Segregated Account of Ambac Assurance Corporation (Filed as Exhibit 99.1 to Ambac Financial Group, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2010 and incorporated herein by reference.) Press Release dated February 28, 2018, announcing the appointment of Joan Lamm-Tennant, effective March 1, 2018, to the the Board of Directors of Ambac Financial Group, Inc. | Ambac Financial Group, Inc. 161 2017 FORM 10-K | (b) Exhibits Other exhibits, filed or furnished, as indicated: 12.1+ 21.1+ 23.1+ 24.1+ 31.1+ 31.2+ 32.1++ 101.INS Computation of Ratio of Earnings to Fixed Charges List of Subsidiaries of Ambac Financial Group, Inc. Consent of Independent Registered Public Accounting Firm Power of Attorney for directors of Ambac Financial Group, Inc. Certification of Chief Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) Promulgated under the Securities Exchange Act of 1934, as amended. Certification of Chief Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) Promulgated under the Securities Exchange Act of 1934, as amended. Certification of Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. XBRL Instance Document. 101.SCH XBRL Taxonomy Extension Schema Document. 101.CAL XBRL Taxonomy Extension Calculation Linkbase Document. 101.LAB XBRL Taxonomy Extension Label Linkbase Document. 101.PRE XBRL Taxonomy Extension Presentation Linkbase Document. 101.DEF XBRL Taxonomy Extension Definition Linkbase Document. + Filed herewith. ++ Furnished herewith. | Ambac Financial Group, Inc. 162 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES SCHEDULE I — SUMMARY OF INVESTMENTS Other Than Investments in Related Parties December 31, 2017 Type of Investment ($ in Thousands) Municipal obligations Corporate obligations Foreign obligations U.S. government obligations Residential mortgage-backed securities Collateralized debt obligations Other asset-backed securities Short-term Other Total Amortized Cost Estimated Fair Value Amount at Which Shown in the Balance Sheet $ 845,778 $ 779,834 $ 858,774 26,245 186,619 860,075 26,543 185,127 779,834 860,075 26,543 185,127 2,214,512 2,251,333 2,251,333 50,754 531,660 557,476 396,689 51,037 597,942 557,270 431,630 51,037 597,942 557,270 431,630 $ 5,668,507 $ 5,740,791 $ 5,740,791 | Ambac Financial Group, Inc. 163 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES SCHEDULE II— CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY ONLY) Condensed Balance Sheets ($ in thousands, except share data) December 31, 2017 2016 Assets: Fixed income securities, at fair value (amortized cost: 2017—$239,476 and 2016—$220,749) $ 230,055 $ Short-term investments, at cost (approximates fair value) Other investments Total investments Cash Investment in subsidiaries Investment income due and accrued Current taxes receivable(1) Other assets Total assets Liabilities and Stockholders' Equity: Liabilities: Accounts payable and other liabilities Total liabilities Stockholders’ equity: Preferred stock, par value $0.01 per share; 20,000,000 shares authorized shares; issued and outstanding shares—none Common stock, par value $0.01 per share; 130,000,000 shares authorized; issued and outstanding shares: 45,275,982 and 45,194,954 Additional paid-in capital Accumulated other comprehensive income (loss) Retained earnings Treasury stock, shares at cost: 24,816 and 22,458 Total Ambac Financial Group, Inc. stockholders’ equity Total liabilities and stockholders’ equity 69,531 64,691 364,277 3,949 968,392 329 29,576 14,946 214,023 66,570 30,003 310,596 32,251 1,340,442 272 28,722 4,132 $ 1,381,469 $ 1,716,415 321 321 — 453 199,560 (52,239) 1,233,845 (471) 1,381,148 $ 1,381,469 $ 2,501 2,501 — 452 195,267 (38,990) 1,557,681 (496) 1,713,914 1,716,415 (1) Of these amounts, $30,496 and $28,691 receivable from the Registrant's wholly-owned subsidiary, Ambac Assurance Corporation, pursuant to the Amended TSA. The condensed financial statements should be read in conjunction with the consolidated financial statements and notes thereto and the following notes. | Ambac Financial Group, Inc. 164 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES SCHEDULE II— CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY ONLY) Condensed Statement of Comprehensive Income ($ in thousands) Year Ended December 31, 2017 2016 2015 Revenues: Investment income Other than temporary impairments Net realized gains (losses) Total revenues Expenses: Operating expenses Total expenses Income (loss) before income taxes and equity in undistributed net loss of subsidiaries Federal income tax provision (benefit) Income before equity in undistributed net income of subsidiaries Equity in undistributed net income (loss) of subsidiaries Net income (loss) Other comprehensive income (loss), after tax: Net income (loss) Unrealized gains (losses) on securities, net of deferred income taxes of $0 Gain (loss) on foreign currency translation, net of deferred income taxes of $0. Changes to postretirement benefit, net of tax Total other comprehensive income (loss) Total comprehensive income (loss) attributable to Ambac Financial Group, Inc. $ 24,411 $ 13,493 $ (550) (6,575) 17,286 3,913 3,913 13,373 (29,398) 42,771 (371,486) (289) (7) 13,197 11,486 11,486 1,711 (28,739) 30,450 44,393 $ $ $ (328,715) $ 74,843 $ (328,715) $ 74,843 $ (81,520) 73,586 1,273 (6,661) 67,900 (122,128) 23 (54,205) (335,376) $ 20,638 $ 9,826 (155) (27) 9,644 8,922 8,922 722 (70,811) 71,533 421,870 493,403 493,403 (159,730) (44,651) (687) (205,068) 288,335 The condensed financial statements should be read in conjunction with the consolidated financial statements and notes thereto and the following notes. | Ambac Financial Group, Inc. 165 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES SCHEDULE II— CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY ONLY) Condensed Statement of Stockholders' Equity ($ in thousands) Total Retained Earnings Accumulated Other Comprehensive Income Preferred Stock Common Stock Common Stock Held in Treasury, at Cost Additional Paid-in Capital Balance at January 1, 2017 $ 1,713,914 $ 1,557,681 $ (38,990) $ — $ 452 $ 195,267 $ (496) Total comprehensive income (loss) (335,376) (328,715) Adjustment to initially apply ASU 2018-02 Adjustment to initially apply ASU 2016-09 Stock-based compensation Cost of shares (acquired) issued under equity plan Issuance of common stock — (137) 4,293 6,588 (137) — (1,547) (1,572) 1 — Balance at December 31, 2017 $ 1,381,148 $ 1,233,845 Balance at Balance at January 1, 2016 $ 1,684,799 $ 1,478,439 Total comprehensive income Adjustment to initially apply ASU 2014-13 Stock-based compensation Cost of shares (acquired) issued under equity plan Cost of warrants acquired Issuance of common stock Warrants exercised 20,638 6,442 5,253 (505) (2,717) 2 2 74,843 6,442 — (127) (1,916) — — Balance at December 31, 2016 $ 1,713,914 $ 1,557,681 Balance at January 1, 2015 $ 1,399,105 $ 989,290 $ $ $ $ (6,661) (6,588) — — — — — — — — — — — — — — — 1 — — — 4,293 — — (52,239) $ — $ 453 $ 199,560 15,215 $ — $ 450 $ 190,813 (54,205) — — — — — — — — — — — — — — — — — — 2 — — — 5,253 — (801) — 2 (38,990) $ — $ 452 $ 195,267 220,283 $ — $ 450 $ 189,138 $ $ $ $ Total comprehensive income Stock-based compensation Cost of shares (acquired) issued under equity plan Cost of warrants acquired Warrants exercised 288,335 493,403 (205,068) 3,105 — (374) (5,375) 3 (312) (3,942) — — — — — — — — — — — — — — — — 3,105 — (1,433) 3 Balance at December 31, 2015 $ 1,684,799 $ 1,478,439 $ 15,215 $ — $ 450 $ 190,813 $ The condensed financial statements should be read in conjunction with the consolidated financial statements and notes thereto and the following notes. — — — — 25 — (471) (118) — — — (378) — — — (496) (56) — — (62) — — (118) | Ambac Financial Group, Inc. 166 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES SCHEDULE II— CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY ONLY) Condensed Statements of Cash Flow ($ in thousands) Year Ended December 31, Cash flows from operating activities: Net income (loss) 2017 2016 2015 $ (328,715) $ 74,843 $ 493,403 Adjustments to reconcile net income loss to net cash used in operating activities: Equity in undistributed net (income) loss of non-debtor subsidiaries Amortization of bond premium and discount Other-than-temporary impairment charges Net realized gains (losses) Increase (decrease) in current income taxes payable Share-based compensation Investment income due and accrued (Increase) decrease in other assets Other, net Net cash provided by (used in) operating activities Cash flows from investing activities: Proceeds from matured bonds Purchases of bonds Change in short-term investments Change in other investments Other, net Net cash provided by (used in) investing activities Cash flows from financing activities: Cost of warrants acquired Proceeds from warrant exercise Net cash (used in) financing activities Net cash flow Cash at beginning of period Cash at end of period Supplemental disclosure of cash flow information: Cash paid during the period for: Income taxes 371,486 (16,724) 550 6,575 (854) 4,293 (57) (10,814) (9,960) 15,780 186,747 (195,853) (2,961) (34,688) 2,673 (44,082) — — — (28,302) 32,251 (44,393) (7,208) 289 7 42,126 5,253 (149) 646 5,814 77,228 269,459 (279,582) (18,491) (4,664) (9,009) (42,287) (2,717) 2 (2,715) 32,226 25 3,949 $ 32,251 $ (421,870) (4,690) 155 27 (71,069) 3,105 (69) 991 549 532 347,539 (312,419) (25,143) (5,253) — 4,724 (5,375) 3 (5,372) (116) 141 25 784 $ 635 $ 394 $ $ The condensed financial statements should be read in conjunction with the consolidated financial statements and notes thereto and the following notes. | Ambac Financial Group, Inc. 167 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES SCHEDULE II— CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY ONLY) Notes to Condensed Financial Information (Dollar Amounts in Thousands) The condensed financial information of Ambac Financial Group, Inc. (“Ambac” or the “Registrant”) as of December 31, 2017 and 2016 and for the three years in the period ended December 31, 2017, should be read in conjunction with the consolidated financial statements of Ambac Financial Group, Inc. and Subsidiaries and the notes thereto included in this 2017 Annual Report on Form 10-K for the year ended December 31, 2017. Ambac, headquartered in New York City, is a financial services holding company incorporated in the state of Delaware on April 29, 1991. On May 1, 2013, Ambac emerged from Chapter 11 bankruptcy protection when the Second Modified Fifth Amended Plan of Reorganization of Ambac (the “Reorganization Plan”) became effective. On December 26, 2013, the United States Bankruptcy Court for the Southern District of New York (the “Bankruptcy Court”) entered an order of final decree closing Ambac’s Chapter 11 case. Ambac filed a voluntary petition for relief under Chapter 11 of the United States Bankruptcy Code in the Bankruptcy Court on November 8, 2010. Income Taxes Ambac files a consolidated Federal income tax return with its U.S. subsidiaries. Ambac and its subsidiaries also file separate or combined income tax returns in various states, local and foreign jurisdictions. As of December 31, 2017 Ambac had a U.S. loss carryforwards totaling $3,694,844, which, if not utilized, will begin expiring in 2029, and will fully expire in 2032. The NOL allocable to AFG as of December 31, 2017 is $1,412,639. Pursuant to the Amended TSA, to the extent Ambac Assurance generated taxable income after September 30, 2011, which offset the allocated $3,650,000 of NOLs, (or the proportionate amount of AMT NOL (as defined)), it is obligated to make payments (“Tolling Payments”), subject to certain credits, to the Registrant in accordance with a four Tier, A through D, NOL usage table. NOLs in excess of the allocated $3,650,000 may be utilized beginning in 2016, subject to the Registrant's consent, not to be unreasonably withheld, for a payment of 25% of the benefit received. Ambac Assurance has utilized all of its current post determination date NOLs generated from September 30, 2011 through December 31, 2017 (post determination date NOLs); however, additional post determination date NOLs may be generated in the future. During this time period, Ambac Assurance's cumulative net taxable income was approximately $1,367,795, which utilized all of the $479,000 allocated Tier A NOL and $888,795 of the $1,057,000 allocated Tier B NOL and resulted in accrued Tolling Payments, net of applicable credits. At December 31, 2017, $30,496 of Tolling Payments are due to Ambac no later than forty-five days after April 15, 2018. Of the bankruptcy related credits available to offset the first $5,000 of payments due under each of the NOL usage Tiers A, B, and C, Ambac Assurance has fully utilized the combined $10,000 of Tier A and Tier B credits. | Ambac Financial Group, Inc. 168 2017 FORM 10-K | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES SCHEDULE IV— REINSURANCE Years Ended December 31, 2017, 2016 and 2015 Insurance Premiums Written ($ in Thousands) Gross Amount Ceded to Other Companies Assumed from Other Companies Net Amount Percentage of Amount Assumed to Net Year Ended December 31, 2017 $ (14,313) $ (2,104) $ — $ (12,209) —% Year Ended December 31, 2016 (53,837) (8,772) $ Year Ended December 31, 2015 (37,572) (3,001) — — (45,065) —% (34,571) —% | Ambac Financial Group, Inc. 169 2017 FORM 10-K | Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. AMBAC FINANCIAL GROUP, INC. SIGNATURES Dated: February 28, 2018 By: /S/ DAVID TRICK David Trick Executive Vice President and Chief Financial Officer Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated. Signature Title Date /S/ JEFFREY S. STEIN* Chairman of the Board and Director February 28, 2018 Jeffrey S. Stein /S/ CLAUDE LEBLANC President, Chief Executive Officer and Director February 28, 2018 Claude LeBlanc (Principal Executive Officer) /S/ DAVID TRICK Executive Vice President and Chief Financial Officer February 28, 2018 David Trick (Principal Financial Officer) /S/ ROBERT B. EISMAN Senior Managing Director and Chief Accounting Officer February 28, 2018 Robert B. Eisman (Principal Accounting Officer) /S/ ALEXANDER D. GREENE* Director February 28, 2018 Alexander D. Greene /S/ IAN D. HAFT* Director Ian D. Haft /S/ DAVID L. HERZOG* Director David L. Herzog February 28, 2018 February 28, 2018 /S/ C. JAMES PRIEUR* Director February 28, 2018 C. James Prieur /S/ STEPHEN M. KSENAK *By: Stephen M. Ksenak Attorney-in-fact February 28, 2018 | Ambac Financial Group, Inc. 170 2017 FORM 10-K | Appendix A Non-GAAP Financial Measures Ambac reports two non-GAAP financial measures: Adjusted Earnings and Adjusted Book Value. A non-GAAP financial measure is a numerical measure of financial performance or financial position that excludes (or includes) amounts that are included in (or excluded from) the most directly comparable measure calculated and presented in accordance with GAAP. We are presenting these non-GAAP financial measures because they provide greater transparency and enhanced visibility into the underlying drivers of our business. Adjusted Earnings and Adjusted Book Value are not substitutes for the Company’s GAAP reporting, should not be viewed in isolation and may differ from similar reporting provided by other companies, which may define non-GAAP measures differently. Below are reconciliations of net income (loss) attributable to common shareholders to the non-GAAP measure of Adjusted Earnings (Losses) and Total Ambac Financial Group, Inc. stockholders’ equity per share ("Book Value") to the non-GAAP measure of Adjusted Book Value per share. Each of the reconciling items is more fully defined in our 2017 Annual Report on Form 10-K within Management's Discussion and Analysis of Financial Condition and Results of Operations under the heading “Non-GAAP Financial Measures." Ambac has a significant U.S. tax net operating loss ("NOL") that is offset by a full valuation allowance in the GAAP consolidated financial statements. As a result of this and other considerations, for purposes of non-GAAP measures, we utilized a 0% effective tax rate; which is subject to change. Adjusted Earnings (Loss) ($ in millions) May-June 2013 Year Ended December 31, 2014 2015 2016 Net income (loss) attributable to common shareholders $ 505 $ 484 $ 493 $ 75 $ Adjustments: Non-credit impairment fair value (gain) loss on credit derivatives Insurance intangible amortization Impairment of goodwill Foreign exchange (gains) losses (1) Fair value (gain) loss on interest rate derivatives from Ambac CVA (166) 100 — (24) 47 (17) 152 — 34 (16) (37) 170 515 27 (14) (8) 175 — 39 34 2017 (329) (11) 151 — (21) 45 Adjusted earnings (loss) (2) $ 462 $ 637 $ 1,154 $ 315 $ (165) Book Value Per Share / Adjusted Book Value Per Share June 30, 2013 December 31, 2013 2014 2015 2016 Total AFGI Stockholders' Equity per share $ 6.38 $ 15.62 $ 31.09 $ 37.41 $ 37.94 $ Adjustments: Non-credit impairment fair value losses on credit derivatives Insurance intangible asset and goodwill Ambac CVA on interest rate derivative liabilities Net unearned premiums and fees in excess of expected losses Net unrealized investment (gains) losses in Accumulated Other Comprehensive Income Adjusted book value per share (2) 4.19 (47.46) (1.44) 40.08 2.02 3.77 $ 1.62 (46.94) (1.08) 38.17 1.24 (42.78) (1.43) 31.57 0.42 (26.91) (1.75) 20.11 0.25 (21.30) (0.99) 16.21 0.93 (4.68) (1.13) (2.63) $ 8.32 $ 15.01 $ 28.15 $ 29.48 $ 2017 30.52 0.01 (18.71) — 13.20 (0.68) 24.34 (1) Elimination of the foreign exchange gains (losses) on the re-measurement of assets, liabilities and transactions in non-functional currencies. For periods prior to 2016, we eliminated the foreign exchange gains (losses) on the re-measurement of net premium receivables and loss and loss expense reserves in non-functional currencies. Given the long-duration of a significant portion of these premium receivables and loss reserves, the foreign exchange re- measurement gains (losses) are not necessarily indicative of the total foreign exchange gains (losses) that Ambac will ultimately recognize. Beginning in 2016, we have eliminated the foreign exchange gains (losses) on all assets, liabilities and transactions in non-functional currencies. Expanding this adjustment to include all foreign exchange gains (losses) enables users of our financial statement to better view the business results without the impact of fluctuations in foreign currency exchange rates, particularly as assets held in non-functional currencies have grown, and facilitates period-to-period comparisons of Ambac's operating performance. Note that we have not recast prior period adjustment to conform to the methodology as such amounts were not material. (2) Totals may not add due to rounding differences. [ THIS PAGE INTENTIONALLY LEFT BLANK ] CORPORATE INFORMATION Corporate Office Ambac Financial Group, Inc. One State Street Plaza New York, NY 10004 212-658-7470 www.ambac.com Investor Relations Lisa A. Kampf Managing Director, Investor Relations Ambac Financial Group, Inc. 212-208-3222 ir@ambac.com Common Stock Listing The common stock of Ambac Financial Group, Inc. trades on the NASDAQ Global Select Market under the symbol “AMBC”. Independent Registered Public Accounting Firm KPMG, LLP 345 Park Avenue New York, NY 10154 Annual Meeting of Stockholders The Annual Meeting of Stockholders will be held on Friday, May 18, 2018, at 11:00 am Eastern Time at our executive offices, One State Street Plaza, New York, NY 10004. Investor Services/Transfer Agent COMPUTERSHARE P.O. BOX 505000 Louisville, KY, 40233 Inside the USA call 1-800-662-7232 Outside the USA call 1-781-575-4238 Hearing impaired call 1-800-952-9245 www.computershare.com/investor or overnight correspondence can be sent to: COMPUTERSHARE 462 South 4th Street, Suite 1600 Louisville, KY, 40202 Corporate Governance Ambac is committed to maintaining the independence of Ambac’s Board of Directors and its committees and the integrity of its corporate governance processes. Our Corporate Governance Guidelines, Code of Business Conduct and charters that govern our Board committees, all of which are designed to keep Ambac accountable to its shareholders, can be found at http://ir.ambac.com/governance.cfm. Officer Certifications The certifications of Ambac’s Chief Executive Officer and Chief Financial Officer, required under Section 302 of the Sarbanes-Oxley Act of 2002, have been filed as exhibits to Ambac’s 2017 Annual Report on Form 10-K. 1 AMBAC FINANCIAL GROUP, INC. One State Street Plaza, New York, NY 10004 www.ambac.com 

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