1 ManTech International Corporation Mission Focused at All Times To Our Shareholders: In 2020, our nation faced a multitude of challenges. From a rapidly changing operating environment driven by a global pandemic that intensified our dependence on digital readiness, to cyberattacks against our national security and civil unrest within our nation. Through it all, ManTech and our people were resilient, agile and remained focused on our customers and their critical missions. While prioritizing the health and safety of our employees, we provided continuous support to our government customers in order to protect our nation. During a difficult year for many, we are fortunate that our business, our federal government customers and our market opportunities remained strong. As a result, ManTech emerged from 2020 with excellent financial and operational results for our company and shareholders and we built upon our proven strengths through investments in technologies that enhance our capabilities. We enter 2021 with strong alignment to our core customers’ most difficult challenges and a steadfast focus on innovation that positions ManTech well for future success. Looking ahead, we launched our 2023 Strategic Plan to build on this momentum of Securing the Future with agility, speed, security and execution. Strong Financial and Operational Performance in 2020 In 2020, ManTech’s revenue rose 13 percent over the past year to $2.5 billion. We reported Securing the Future Kevin M. Phillips Chairman of the Board, President and CEO operating income of $158 million and net income of $121 million, which increased 14 percent and 6 percent, respectively. Diluted earnings per share was $2.97. Operating cash flow was $247 million, and the company had $41 million in cash and cash equivalents and $15 million in outstanding borrowings on its $500 million revolving credit facility. Total contract awards reached $3.7 billion, driving a healthy book-to-bill ratio of 1.5x. In 2020, approximately 45 percent of the company’s work came from new business. In addition to our classified awards, key contracts included: • $920 million five-year contract from Naval Surface Warfare Center Crane Division to modernize intelligence, surveillance and reconnaissance sensors and electronic 2020 ANNUAL REPORT 2 intelligence processing for U.S. Navy maritime reconnaissance and patrol aircraft. • $273 million five-year contract to provide advanced analytics for the Department of Homeland Security U.S. Customs and Border Protection to identify, analyze and stop threats to the homeland. • $266 million contract to support a Department of Defense agency with designing, developing, fielding and supporting an operational cyber infrastructure known as the Joint Common Access Platform (JCAP). • $260 million four-year contract awarded by the U.S. Navy for technology modernization initiatives to transform maritime patrol and reconnaissance aircraft. Strategic acquisitions remained a key component of our plan for growth. Through our acquisitions of Minerva Engineering and Tapestry Technologies in the fourth quarter, we enhanced our full-spectrum cyber capabilities and added more highly skilled talent to our team. Building on our Momentum After five decades at ManTech as a driving force and an industry pioneer, our founder George J. Pedersen transitioned from Executive Chairman to Chairman Emeritus in September. We look forward to continuing to benefit from his wisdom as a member of our Board of Directors. On a personal note, I am honored that the Board elected me to be George’s successor as Chairman. In that role, I will work to continue his legacy into the next generation. I am fortunate to be supported by an outstanding team in these efforts. In June we appointed Matt Tait as Chief Operating Officer as part of a broader organizational change to better align our business segments with our Defense, Intelligence and Federal Civilian agency partners. This strategic change also included the appointment of Andrew Twomey (Defense), Adam Rudo (Intelligence) and Bryce Pippert (Federal Civilian) as Executive Vice Presidents and General Managers — each with deep experience and commitment to their customers and missions. We reinvigorated the Innovation and Capabilities Office to better drive technical excellence and leadership under Chief Technology Officer Srini Iyer. We also appointed Executive Vice President Bonnie Cook to lead the new Business Services organization, which is dedicated to enabling our business performance by delivering industry-leading services to our programs and customers in key support functions. Continued Investment in our People At ManTech, we know that our success is fundamentally due to our outstanding talent. Our people are our most vital asset, and we take tangible steps to support and foster their growth. We grew our overall employee base to 9,400 through effective planning and execution. We also introduced “Career Enablement” initiatives to help advance careers in key areas that address our customers’ critical mission needs. These efforts earned public recognition of ManTech as an “Employer of Choice” in our industry including: • Glassdoor rating of employee satisfaction at ManTech consistently exceeding our peers. • Skillsoft’s “Program of the Year” for our successful employee-appreciated learning program. 3 ManTech International Corporation • Best for Vets Employer – 2020 by Military Times, showcasing our workforce made up of more than 45 percent Veterans. national and local charities in support of first responders, food banks, health care workers and those impacted by the pandemic. • ASTORS Platinum Award for “Best Federal Government Security Program,” demonstrating how we leverage our cyber technology to protect the U.S. military community and assets. Perhaps the most significant recognition goes to ManTech employees themselves — great people who demonstrate their commitment to our nation and community every day. Most noteworthy they raised $2 million in a charitable contribution campaign to benefit Top left to right: During the pandemic, ManTech employees volunteered in their communities. One volunteered at a community food bank and another donated blood at a blood drive. Below: Inova Health System personnel thank ManTech employees for the company’s charitable donations during the pandemic. Securing the Future Maintaining a Customer and Mission First Strategic Focus to Drive Continued Success Successful companies are agile — ready to transform to remain at the top of their game and at the top of their customers’ minds and needs. In our market, where speed of innovation is critical, competition is fierce and the landscape is ever changing, the federal government looks to ManTech to deliver new technologies and drive innovation that solves their mission challenges today and every day. On behalf of the entire ManTech team, we extend our deep appreciation for your investment and continuing support. We look forward to updating you on our progress throughout 2021. Sincerely, e Kevin M. Phillips Chairman of the Board, President and CEO Revenue $2.5B Diluted Earnings per Share $2.97 Cash Returned to Shareholders $52M Operating Cash Flow $247M Operating Margin 6.3% Bookings $3.7B 2020 ANNUAL REPORT 4 Company Competencies Sectors Certifications AS9100D ISO 9001:2015 CMMI 2.0 Service ML3 CMMI Dev 2.0 ML4 ISO 20000-1:2018 ISO 27001:2013 Defense Intelligence Federal Civilian Capabilities: Full-Spectrum Cyber • Cyber Network Operations (CNO) / Offensive • Defense • Analytics • Security Orchestration, Automation & Response • Hardening & Resilience • Cyber Range & Training • Risk Management and Compliance Secure Mission & Enterprise IT • IT and Digital Modernization and T Transformation • Managed Services and Integrated Service Management • Cloud, Hybrid Cloud, and Multi-Cloud Solutions Infrastructure as a Service (IaaS) • • Platform as a Service (PaaS) • Software as a Service (SaaS) • User Engagement and Experience • Digital Workplace Transformation and Enterprise Mobility Services Advanced Data Analytics • Predictive Analytics • Data Science • Data Fusion and Visualization • Analytics Automation • Data Collection and Management Software Systems Development • Agile Development • DevOps and DevSecOps Development • Cloud Native Development • Application Migration and Modernization • Mobile Application Development Intelligent Systems Engineering • Platform Innovation and Modernization • Digital Engineering Transformation • Systems Architecting using Model-Based Systems Engineering Approaches • Modeling, Simulation and Analysis • Integration, Testing and Evaluation • Reliability, Availability and Maintainability Analysis • Systems Lifecycle Support / In-Service Engineering Intelligence Mission Support • Multi-Disciplined Intelligence Intelligence Lifecycle Support • • Security, Mission Assurance and Program Protection Intelligence Analysis • Mission Operations and Management • • Media and Material Exploitation • Counterintelligence Mission Operations • C5ISR • Training • Mission Planning and Execution • Logistics, Supply Chain Management and Sustainment 5 ManTech International Corporation Our Technology Focus Areas Through our Innovation and Capabilities Office, ManTech is building upon our solutions and services through technology investments in five key Technology Focus Areas vital to our customers’ mission-critical needs: Cognitive Cyber for Physical and Digital Platforms: cybersecurity systems that learn, automate responses and work smarter, supporting mission operators in the dynamic and high-velocity arena of cyber conflict. Mission & Enterprise IT (M/EIT): continuous digital modernization at agencies of critical importance in national security, delivering best-in-class capabilities ranging from cloud migration to operations and analytics. Analytics, Automation & Artificial Intelligence (A3): hyper-scale analytics, robotic process automation (RPA) and leading-edge AI and machine learning technologies to drive efficiency, cost savings and performance. Intelligent Systems Engineering (ISE): model-based systems engineering and digital twinning to virtualize and thoroughly test connected platforms, sensors and digital interfaces prior to live implementation. Data at the Edge (D@tE): data assurance solutions that enable customers to access and manage their data securely via Zero Trust cyber defenses, and leverage Edge computing to speed delivery. Our Board of Directors George J. Pedersen – Co-Founder and Chairman Emeritus Kevin M. Phillips – Chairman of the Board, CEO and President Richard L. Armitage – President of Armitage International, Former Deputy Secretary of State, Former Assistant Secretary of State, Ambassador Mary K. Bush – Chairwoman of Bush International Barry G. Campbell – Former Director, President and Chief Executive Officer, Allied Aerospace Industries, Inc. Richard J. Kerr – Member of the President’s Commission on Intelligence Reform, Former Deputy Director, CIA Lieutenant General Kenneth A. Minihan – USAF Ret., Managing Director of the Homeland Security Fund for Paladin Capital Group Peter B. LaMontagne – CEO, Smartronix Securing the Future 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, 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 000-49604 ManTech International Corporation (Exact name of registrant as specified in its charter) __________________________________________ Delaware (State or other jurisdiction of incorporation) 2251 Corporate Park Drive (Address of principal executive offices) Herndon VA 22-1852179 (IRS Employer Identification No.) 20171 (Zip Code) (703) 218-6000 (Registrant's telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act: Title of each class Class A Common Stock Trading Symbol(s) MANT Name of each exchange on which registered Nasdaq 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 every Interactive Data File required to be submitted 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 such files). Yes ☒ No ☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. Large accelerated filer Non-accelerated filer ☒ ☐ Emerging growth company ☐ Accelerated filer Smaller reporting 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 has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ☐ No ☒ The aggregate market value of the voting stock held by non-affiliates of the registrant as of June 30, 2020 was $1.85 billion (based on the closing price of $68.49 per share on June 30, 2020, as reported by the Nasdaq Global Select Market). There were the following numbers of shares outstanding of each of the registrant's classes of common stock as of February 17, 2021: ManTech International Corp. Class A Common Stock, $0.01 par value per share, 27,325,395 shares; ManTech International Corp. Class B Common Stock, $0.01 par value per share, 13,176,695 shares. DOCUMENTS INCORPORATED BY REFERENCE Certain portions of the definitive Proxy Statement to be filed with the Securities Exchange Commission pursuant to Regulation 14A in connection with the registrant's 2021 Annual Meeting of Stockholders, to be filed subsequent to the date hereof, are incorporated by reference into Part III (Items 10, 11, 12, 13 and 14) of this Annual Report on Form 10-K. Such definitive Proxy Statement will be filed with the Commission not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K. TABLE OF CONTENTS Item 1. Business Item 1A. Risk Factors Item 1B. Unresolved SEC Staff Comments Item 2. Properties Item 3. Legal Proceedings Item 4. Mine Safety Disclosures Part I 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 Item 7A. Quantitative and Qualitative Disclosures about Market Risk Item 8. Financial Statements and Supplementary Data Report of Independent Registered Public Accounting Firm Consolidated Balance Sheets Consolidated Statements of Income Consolidated Statements of Comprehensive Income Consolidated Statements of Changes in Stockholders' Equity Consolidated Statements of Cash Flows Notes to Consolidated Financial Statements Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure Item 9A. Controls and Procedures Item 9B. Other Information Item 10. Directors, Executive Officers and Corporate Governance Part III Item 11. Executive Compensation Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters Item 13. Certain Relationships and Related Transactions, and Director Independence Item 14. Principal Accounting Fees and Services Item 15. Exhibits, Financial Statement Schedule Item 16. Form 10-K Summary Part IV Signatures Schedule II Page 4 7 13 14 14 14 15 17 17 26 27 28 30 31 32 33 34 36 60 60 61 63 63 63 64 64 65 67 68 69 [THIS PAGE INTENTIONALLY LEFT BLANK] PART I In this document, unless the context indicates otherwise, the terms “Company” and “ManTech” as well as the words “we,” “our,” “ours” and “us” refer to both ManTech International Corporation and its consolidated subsidiaries. The term “registrant” refers only to ManTech International Corporation, a Delaware corporation. Industry and Market Data Industry and market data used throughout this Annual Report on Form 10-K were obtained through surveys and studies conducted by third parties, industry and general publications. We have not independently verified any of the market data obtained from these third-party sources, nor have we validated any assumptions underlying such data. Cautionary Note Regarding Forward-Looking Statements All statements and assumptions contained in this Annual Report on Form 10-K that do not relate to historical facts constitute "forward-looking statements." These statements can be identified by the fact that they do not relate strictly to historical or current facts. Forward-looking statements often include the use of words such as "may," "will," "expect," "intend," "anticipate," "believe," "estimate," "plan" and words and terms of similar substance in connection with discussions of future events, situations or financial performance. While these statements represent our current expectations, no assurance can be given that the results or events described in such statements will be achieved. Forward-looking statements may include, among other things, statements with respect to our financial condition, results of operations, prospects, business strategies, competitive position, growth opportunities, and plans and objectives of management. Such statements are subject to numerous assumptions, risks, uncertainties and other factors, many of which are outside of our control, and include, without limitations, the risks and uncertainties discussed in Item 1A "Risk Factors" in Part I of this Annual Report on Form 10-K. Factors or risks that could cause our actual results to differ materially from the results we anticipate include, but are not limited to, the following: • • • • • • • • • • • • • failure to maintain our relationship with the U.S. government, or the failure to compete effectively for new contract awards or to retain existing U.S. government contracts; disruptions to our business resulting from the COVID-19 pandemic or other similar global health epidemics, pandemics and/or other disease outbreaks; adverse changes in U.S. government spending for programs we support, whether due to changing mission priorities, socio-economic policies or federal budget constraints generally; inability to recruit and retain a sufficient number of employees with specialized skill sets or necessary security clearances who are in great demand and limited supply; failure to compete effectively for awards procured through the competitive bidding process, and the adverse impact of delays resulting from our competitors' protests of new contracts that are awarded to us; disruptions to our business or damage to our reputation resulting from cyber attacks and other security threats; failure to obtain option awards, task orders or funding under our contracts; the government renegotiating, modifying or terminating our contracts; failure to comply with, or adverse changes in, complex U.S. government laws and procurement regulations; adverse results of U.S. government audits or other investigations of our government contracts; failure to successfully integrate acquired companies or businesses into our operations or to realize any accretive or synergistic effects from such acquisitions; failure to mitigate risks associated with conducting business internationally; and adverse changes in business conditions that may cause our investments in recorded goodwill to become impaired. We urge you not to place undue reliance on these forward-looking statements, which speak only as of the date of this Annual Report. We undertake no obligation to update any forward-looking statement made herein following the date of this Annual Report, whether as a result of new information, subsequent events or circumstances, changes in expectations or otherwise. 3 Item 1. Business Corporate Overview and Background We were co-founded by George J. Pedersen in 1968 as a New Jersey corporation, starting with a single U.S. Navy contract. We provide innovative, mission-focused technology solutions and services for U.S. intelligence community, defense and federal civilian agencies. For over 50 years we have successfully developed and delivered solutions that support national and homeland security missions. Our principal areas of expertise include full-spectrum cyber, secure mission and enterprise information technology (IT), advanced data analytics, intelligent systems engineering, software and systems development, and national security mission support. We have differentiated technical capabilities, intimate knowledge of our customers' missions, and extensive experience providing proven, diverse sets of solutions and services, which we use to help our customers solve some of their greatest challenges and most complex problems. We provide services and solutions that support missions of national priority and significance, such as global cyber operations, military operational readiness, IT and digital modernization, and national security threat intelligence and analytics. Our Solutions and Services We combine deep domain expertise and technical capability to build upon our strong record of delivering comprehensive IT, systems engineering and other services and solutions, primarily in support of mission-critical programs for the intelligence community, the Department of Defense (DoD) and federal civilian agencies including the diplomatic, homeland security, healthcare and space communities. We integrate our broad capabilities into tailored solutions to meet the evolving requirements of our customers' long-term programs. Our following solution sets are aligned with the long-term needs of our customers: Full-Spectrum Cyber; Secure Mission & Enterprise IT; • • • Advanced Data Analytics; • • • • Mission Operations. Software and Systems Development; Intelligent Systems Engineering; Intelligence Mission Support; and Full-Spectrum Cyber We provide full-spectrum cyber with a focus on cyber network operations (offense), defense, analytics, hardening and resilience, security orchestration, automation and response, range and training, and risk management and compliance. Our professionals tackle some of the most challenging problems facing the nation, including preventing, identifying and neutralizing external cyber-attacks, engineering tailored defensive security solutions and controls, developing robust insider threat detection programs, creating enterprise vulnerability management programs and supporting offensive and exploitation efforts. Additionally, our cyber solutions and services include security operations, threat intelligence, incident response and forensics, boundary defense, security systems engineering, infrastructure security, and computer forensics and exploitation. We are focused on delivering mission continuity in a cyber-contested environment utilizing artificial intelligence (AI) and cognitive methods. Our forensics and incident response capabilities provide our customers with additional insight and evidence for post- attack assessments, assisting with efforts to strengthen their security posture. Through ACRE®, our Advanced Cyber Range Environment, we offer customers enhanced training and visibility into their own IT infrastructures (security design and engineering, vulnerability analysis, software assurance) and arm them with information needed to deny, disrupt and degrade attempts to compromise their business operations and protect their reputation. We also provide extensive, hands-on training and cyber workforce development to help our customers align their resources to the national cyber strategy. Secure Mission & Enterprise IT We develop, implement and sustain enterprise information technology systems on a global scale, leveraging technology to improve mission performance, increase security and reduce costs for our customers. We offer a wide range of services and solutions focused on IT and digital modernization, managed services and integrated service management, edge computing, user 4 engagement and experience and digital workplace transformation and enterprise mobility services. We use our LAUNCHRAMP® enterprise cloud broker solution to speed IT transformation and facilitate the success of our customers' missions. We evaluate our customers' enterprise infrastructure with the goal of enhancing security, increasing efficiency, reducing system footprint and lowering total cost of ownership. We are at the forefront of helping our customers migrate to new, innovative enterprise IT management methodologies, including fully outsourced managed services models. Advanced Data Analytics As data volumes continue to grow rapidly, advanced analytics are necessary to drive actionable intelligence. We provide data collection, predictive analytics, analytics automation and machine learning, and data fusion and visualization. Our systems comprise robust ingest engines and data lakes, fault-tolerant databases for unstructured data, programming models for processing large data sets, query engines with instrumentation to support robust hunt missions, and analytics that score and comb output for high-value intelligence. Our systems and services allow all of our customers, across government domains, to make well-informed decisions that benefit the mission and our nation. Software and Systems Development Our software and systems development activities support all major software development We develop, modify and maintain software solutions and complex systems that link different computing systems and software applications to act as a coordinated whole. This solution set includes a broad array of full lifecycle services, including requirements analysis; planning, design, implementation, integration and enhancement; testing, deployment, maintenance and quality assurance; application migration and modernization; application development; and documentation and configuration management. lifecycle methodologies including Agile, DevSecOps and other hybrid methodologies. As part of our application development processes, we use cutting-edge techniques, such as microservices architecture to enable continuous deployment of large and complex applications and enhance our ability to migrate and transform legacy applications into modernized platforms. Additionally, our expertise spans the ability to develop natively across a variety of domains including the cloud, mobile and other platforms. We develop software solutions and systems across many domains and mission-specific applications. Our experienced software engineers and developers design, develop, integrate, operate and sustain mission-critical software applications and systems worldwide for our defense, intelligence and federal civilian customers. Intelligent Systems Engineering We are recognized across the markets we serve for our operational, engineering and technical expertise across major domains, including land, sea, air, space and cyberspace. We apply intelligent systems engineering across a wide array of large- scale system development and acquisition programs used by government and industry. We provide world-class talent, proven management and technical processes to manage some of the most complex projects throughout their lifecycle, from concept through deployment. The intelligent systems engineering services we provide include platform innovation and modernization, digital and models-based systems engineering, reliability and maintainability, modeling, simulation and analysis, systems lifecycle support, human factors and safety engineering, systems architecture and engineering and test and evaluation. Our test and evaluation services are closely linked with our systems engineering capabilities, and include specific competencies in test engineering, preparation and planning; modeling and simulation; test range operations and management; systems and cyber vulnerability; and independent validation and verification. We use digital representation of systems and the resulting digital artifacts to sustain national defense systems, following the DoD's Digital Engineering Strategy. Intelligence Mission Support We provide specialized professional and technical solutions and mission support services for national security missions. Our multi-disciplined intelligence solutions span the intelligence lifecycle and include security, mission assurance and program protection, intelligence analysis, mission operations and management, counterintelligence and media and material exploitation. We focus on data collection and analysis, including providing support to strategic and tactical intelligence systems, networks and facilities; development and integration of collection and analysis systems and techniques; and support to the development and application of analytical techniques to counterintelligence, homeland security operations, human intelligence operations/ training and counterterrorist operations. We provide signals intelligence collection, analysis and dissemination, and intelligence analysis. We leverage technology advancements in automation and artificial intelligence to support data-centric approaches to cyber threat intelligence and insider threat support. We develop, integrate and maintain advanced signal 5 processing systems to support classified programs and facilities that collect and process intelligence. We also provide counterterrorism operations support and counterintelligence analytical expertise. Mission Operations We have a legacy of providing full-lifecycle mission solutions including C5ISR, training, logistics and supply chain management and sustainment, consulting and mission planning and execution. We are a proven leader in supporting a wide range of federal customers with mission critical solutions. We specialize in the design, development, analysis, implementation and support of all aspects of C5ISR systems and technology. Our experience includes land, sea, air, space and cyber domains, to include command-and-control infrastructure, intelligence, surveillance and reconnaissance platforms and sensors (manned and unmanned), and the communication, dissemination and analysis of data. We also deliver advanced training solutions using a range of environments including live, virtual, constructive, immersive and gaming scenarios. We leverage dedicated subject matter experts, a virtual cyber training range, and our longstanding, acclaimed learning center, ManTech University, in developing customized training solutions for our customers. We also provide supply chain management and logistics services involving the use of sophisticated systems that secure the entire supply chain, from supplies to data. Our comprehensive set of integrated logistics and supply chain management services include supply chain management support (such as warehousing, logistics management, shipping/receiving and global property management), maintenance and reset of ground vehicles and electronics, business process outsourcing, transportation using contracted and government provided services and other field support services (including fielding, training and operations support). Human Capital Resources Our talented people have always been and continue to be our greatest asset. Our ability to deliver enduring value to our customers and their critical missions is enabled by the thoughtful innovation, tireless efforts and steadfast dedication of our people. As of December 31, 2020, we employed approximately 9,400 people, 73% of whom hold security clearances and approximately 45% of whom are veterans. The highly-skilled and cleared nature of our talent base enables us to quickly respond to customer needs and provides us with opportunities to understand and help solve our customers’ most challenging national security problems. Security clearance requirements, and the time and processes required to attain and maintain clearances, serve as a significant barrier to entry in our market. At ManTech, we believe in the abilities and potential of our people. We invest in attracting, developing, and retaining our talented workforce by providing exciting work assignments and opportunities for skill development and career growth, and we In turn, our loyal and career-oriented recognize and reward our people for their contributions and accomplishments. professionals enjoy great trust and success in helping our customers meet the mission-critical needs of our government. Training and Development In recognition of our employees’ interest in career mobility and professional development, we launched our Career Enablement Initiative in 2020. ManTech's Career Enablement Initiative is an employee-initiated, leader supported, and enterprise-wide approach to career growth and development. Since inception, we have seen a rapid adoption of the initiative across the enterprise, as management works to incorporate the initiative into our Company’s culture. In addition, we now offer four career path journeys in the areas of Cyber, IT, Program/Project Management, and P&L Leadership, and have seen an increase in mobility of talent across the organization. Our ManTech University training program, established in 2006, serves as a training platform for the entire company, which we augment with our Skillsoft platform that provides a wide variety of training resources for our employees. Employee Engagement In 2020, our focus on the well being of our employees became even more critical, and we responded by helping our employees navigate the uncertainties and challenges associated with the COVID-19 pandemic. We supported our employees with the accommodations and support that enable them to continue supporting our customers and their missions despite the difficulties of these unprecedented times. We expanded our dedicated team of engagement specialists, both in reach and in scope, to proactively identify areas of vulnerability and connect with potentially affected employees, identify any trends that related to employee concern, and build engagement strategies to address systemic issues. Always looking to improve, we surveyed our employees to obtain valuable feedback about their experience and our business culture. We formed a COVID-19 task force to monitor and oversee our response to, and management of, challenges related to the pandemic. We developed and issued health and safety protocols and prepared our leaders to support and respond to the needs of our employees. We 6 prioritized the engagement of our employees, providing our employees with timely and transparent communications, demonstrating strong and visible leadership, and reinforcing of our culture of compassion, which we believe helped us maintain business continuity and led to high levels of retention and employee engagement. Our Customers We derive the vast majority of our revenues from U.S. government customers. We have successful, long-standing relationships with these customers, having supported many of them for over half a century. Within the U.S. government, our revenues are well-diversified across a number of intelligence, defense and federal civilian agencies. Backlog At December 31, 2020, our backlog was $10.2 billion, of which $1.2 billion was funded backlog. At December 31, 2019, our backlog was $9.1 billion, of which $1.3 billion was funded backlog. We define backlog as our estimate of the remaining future revenue from existing signed contracts, assuming the exercise of all options relating to such contracts and including executed task orders issued under Indefinite Quantity/Indefinite Delivery (ID/IQ) contracts. We also include an estimate of revenue for solutions that we believe we will be asked to provide in the future under the terms of ID/IQ contracts for which there are established patterns of revenues. We define funded backlog as the portion of backlog for which funding currently is appropriated and allocated to the contract by the purchasing agency or otherwise authorized for payment by the customer upon completion of a specified portion of work. Our funded backlog does not include the full value of our contracts because Congress often appropriates funds for a particular program or contract on a yearly or quarterly basis, even though the contract may call for performance over a much longer period of time. A variety of circumstances or events may cause changes in the amount of our backlog and funded backlog, including the execution of new contracts, the extension of existing contracts, the non-renewal or completion of current contracts, the early termination of contracts, and adjustments to estimates for previously included contracts. Changes in the amount of our funded backlog also are affected by the funding cycles of the government. Seasonality Our business is not seasonal. However, in order to avoid the loss of unexpended fiscal year funds it is not uncommon for U.S. government agencies to award extra tasks or complete other contract actions in the weeks and days leading up to September 30, which is the end of the government fiscal year. Additionally, our quarterly results are impacted by the number of working days in a given quarter. There are generally fewer working days for our employees to generate revenue in the first and fourth quarters of our fiscal year. Competitive Landscape We compete in a market shaped by customer requirements and federal budget priorities and constraints. Our key competitors currently include divisions of large defense contractors, as well as a number of large and mid-size U.S. government contractors with specialized capabilities. Because of the diverse requirements of U.S. government customers and the highly competitive nature of large procurements, we frequently collaborate with these and other companies to compete for large contracts, and we bid against these companies in other situations. Available Information Our internet address is www.mantech.com. Through links on the Investor Relations section of our website, we make available, free of charge, our annual reports on Form 10-K, quarterly reports on Form 10-Q, 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 Exchange Act, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the Securities and Exchange Commission (SEC). In addition, the SEC maintains a website (www.sec.gov) that contains reports, proxy statements and other information we file electronically with the SEC. Item 1A. Risk Factors Set forth below are the risks that we believe are material to our investors. You should carefully consider the following risks, together with the other information contained in or incorporated by reference into this Annual Report on Form 10-K, 7 including our consolidated financial statements and notes thereto. Any of the following risks could materially and adversely affect our business, financial condition, results of operations and prospects, as well as the actual outcome of matters as to which forward-looking statements are made in this Annual Report. The risks described below are not the only risks we face. Additional risks and uncertainties not currently known to us, or those we currently deem to be immaterial, may also materially and adversely affect our business, financial condition or results of operations. This section contains forward-looking statements. You should refer to the explanation of the qualification and limitations of forward-looking statements set forth at the beginning of this Annual Report. Risks Related to Our Business We depend on contracts with the U.S. government for substantially all of our revenues. If our relationships with the U.S. government are harmed, our business, future revenues and growth prospects could be adversely affected. We derive the vast majority of our revenues from U.S. government customers, and we anticipate that U.S. government contracts will be the primary source of our revenues for the foreseeable future. Any issue that compromises our relationship with the U.S. government generally, or any U.S. government agency that we serve, could adversely and materially harm our business, prospects, financial condition or operating results. Among the key factors in maintaining our relationships with U.S. government agencies are our performance on our contracts and task orders, the strength of our professional reputation, compliance with applicable laws and regulations, and the strength of our relationships with our customers and client personnel. To the extent our reputation or relationships with U.S. government agencies is impaired, our revenue and operating profits could materially decline. Our business could be adversely affected by the COVID-19 pandemic or other similar global health pandemics, epidemics and/or other disease outbreaks. The COVID-19 pandemic (and any future global health pandemics, epidemics and/or other disease outbreaks), and government responses to mitigate the impact of such crises, could adversely impact our ability to operate our business and therefore have a material adverse effect on our business, financial position, results of operations, liquidity and cash flows. Travel restrictions, social distancing guidelines and other preventative measures put in place by health organizations, federal, state, and local governments have altered the manner in which many of our employees work with our customers, and in response, we have modified our operating schedules and staffing and implemented telework or alternate work arrangements where possible. Notwithstanding our implementation of telework and other means of remote work for our employees that support impacted programs and our internal support organizations, some programs we support, by their nature, cannot accommodate remote work. These programs require shiftwork or the implementation of other mitigation strategies that enable us to maintain our workforce in a “mission ready” state, which has resulted in reduced utilization of that portion of the workforce. The COVID-19 pandemic could also affect our contract performance and could also result in increased costs that may not be fully recoverable, adequately covered by insurance, or addressed by the CARES Act or any subsequent legislative or regulatory measures. Additionally, the COVID-19 pandemic, along with preventative measures put in place by health organizations and federal, state, and local governments, creates ancillary risks to our business, to include the risk of sustained declines in the capital markets, the risk of a sustained economic downturn or recession and other macroeconomic phenomena that could adversely affect customer demand for our services in the future. Furthermore, our business, financial position, results of operations, liquidity and/or cash flows could be adversely and materially affected if the COVID-19 pandemic worsens, lasts significantly longer than anticipated, and/or manifests in additional multiple waves of infection (whether due to new strains of the virus or vaccines providing less protection than expected). Significant and sustained disruptions at our customers could occur, which could in turn have a material adverse effect on our business, financial position, results of operations, liquidity and/or cash flows. We may fail to attract and retain skilled and qualified employees with requisite specialized skill sets or security clearances, which could impair our ability to effectively serve our clients, require more subcontracting work than is optimal, impact our profitability and limit our growth prospects. Our business depends in large part upon our ability to attract and retain sufficient numbers of employees who have advanced IT and technical services skills. Often, these employees must also hold some of the highest security clearances in the United States. Cleared people are in great demand (particularly as it relates to the limited supply of cleared personnel with certain IT and technical service skills), and we compete intensely with other U.S. government contractors, the U.S. government 8 and private industry. The government and industry have recognized that the current process for obtaining security clearances is time-consuming, inefficient and can present a risk to customer mission. While some improvements have been made to the process in the last couple of years, security clearances at the highest levels may still take months or even years to complete. We If we are unable to hire a sufficient anticipate that such personnel may remain a limited resource for the foreseeable future. number of qualified employees or cannot obtain their appropriate security clearances in a timely manner, our ability to serve our clients could be harmed, and we may not be able to grow our business. Additionally, if we cannot hire sufficient qualified employees to staff our contracts, we may be required to engage more contracted personnel, which could reduce our profit margins. Even if we are able to attract the requisite skilled employees, intense competition for such employees may result in attrition in our employee ranks, and we may need to expend additional resources to hire, train and replace such personnel. U.S. government spending and mission priorities could change in a manner that adversely affects our future revenues and limits our growth prospects. We depend on continued expenditures by the U.S. government on programs that we support. Spending levels on programs that we support (including those related to intelligence, defense, homeland security, and federal health IT missions) have varied over time, and our customers may reduce expenditures for our services for any number of reasons, to include changing mission priorities, the availability of discretionary spending in light of the country’s growing debt and long-term fiscal challenges, and the implementation of efficiency and cost reduction efforts. A reduction in U.S. government spending levels, or changes in spending priorities, could adversely affect our business and impact our future revenues. We encounter intense competition to win contracts and most of our contracts are awarded through competitive bidding processes; our revenue and profitability may be adversely impacted if we fail to compete effectively for such awards, or if there are delays as a result of our competitors' protests of contract awards that we receive. We operate in a highly competitive industry, with contract awards typically subject to competitive bidding processes. We may not be able to continue to win competitively awarded contracts at historic levels. We compete with larger companies who have significant financial resources, as well as smaller, more specialized companies that may be able to concentrate their resources into highly-skilled niche markets. Our competitors may be able to provide our customers with more desirable capabilities or better contract terms than we can provide, including price, technical qualifications, past contract experience, geographic presence and the availability of qualified professional personnel. Our failure to compete effectively in competitive procurements could adversely impact our future revenues. Participating in the competitive bidding process also involves costs, risks and uncertainties, including the cost, time and effort required to prepare bids and proposals for contracts that may not ultimately be awarded to us; the need to expend resources or make financial commitments (such as procuring leased premises) in advance of an award decision, or the need to bid on programs prior to the completion of their design, which may result in execution challenges, cost overruns, or in the case of unsuccessful competitions, the loss of committed costs; and the ability to accurately estimate the resources and costs structure required to service any contract we are awarded. The loss of business to our competitors could adversely impact our revenues and, if we are forced to reduce our prices, adversely impact our profitability. In recent years, the competitive environment has also resulted in an increase in bid protests from unsuccessful bidders on contract awards. It can take months to resolve protests by one or more of our competitors relating to contracts that are awarded to us. Even where the protest is unsuccessful and the award to us is upheld, the resulting delay in startup and funding of the work under such contracts may adversely impact our revenues and profitability. Cyber attacks and other security threats could disrupt our business and impair our ability to effectively provide services to our customers; as a leading provider of cyber security services to our customers, any significant cyber incident could damage our reputation and have a material adverse effect on our business and financial results. We create, implement and maintain IT and engineering systems, and provide services that are often critical to our customers' operations, some of which involve classified or other sensitive information in intelligence, national security and other classified or sensitive customer functions. Our network and systems are subject to continuous exposure to cyber and other security threats, including computer viruses, attacks by individual and state-sponsored computer hackers and physical break-ins. We also face a heightened risk of a security breach or disruption due to our custody of classified and other sensitive information. Like other government contractors, we are regularly the target of cyber incidents, and these attempted cyber intrusions are expected to continue to proliferate. 9 If we are unable to protect our network and systems from significant cyber attacks, or if we are unable to detect intrusion attempts or other cyber incidents quickly and remediate those incidents successfully, we may experience one or more of the following adverse effects: • • • • • loss of revenue due to adverse customer reaction; exposure to claims for damages, or the incurrence of significant costs related to upgrading systems, networks and our cyber security program generally; loss of revenue due to the redeployment of staff for remediation efforts instead of work on billable contracts; damage to our reputation, which could adversely impact our ability to attract or retain customers or market our services that relate to the creation or maintenance of secure IT systems; and inability to successfully market services that rely on the creation and maintenance of secure IT systems. While we maintain cyber risk insurance to provide some coverage for certain risks arising from cybersecurity breaches, there is no assurance that such insurance would cover all or a significant portion of the costs or consequences associated with a cybersecurity breach. In addition to these costs and the adverse effects described in this risk factor, a significant cyber breach could result in one or more of our customers terminating or reducing the scope of our contracts with them. Security breaches in customer systems could adversely affect our business. Many of the programs we support and the systems we develop, install and maintain involve managing and protecting information involved in intelligence, national security and other classified or sensitive customer functions. Losses from a security breach in one of these systems could cause serious harm to our business, damage our reputation and impact our eligibility for further work on critical systems for our current customers or for other U.S. government customers generally. Losses could also exceed the policy limits of our errors and omissions and product liability insurance coverage. If our reputation is damaged or our eligibility to compete for additional work is compromised our revenues could be adversely affected. Our earnings and profitability may vary based on the mix of our contracts, and may be adversely affected if we fail to accurately estimate and manage our costs, time and resources. We generate revenues under different types of government contracts, including cost-reimbursable, time-and-materials and fixed-price contracts. Our earnings and profitability may vary depending on changes in the amount of revenues we derive from each type of contract, the nature of services or solutions provided, or the level of achievement of performance objectives required to receive award fees. For example, cost-reimbursable contracts generally offer lower margin opportunities than fixed- price contracts, but tend to minimize financial risk. However, to varying degrees, each contract type involves some risk of underestimating the costs and resources necessary to fulfill the contract obligations. Our profitability is adversely impacted when we incur contract costs that we cannot bill to our customers. While fixed-price contracts allow us to benefit from cost savings, these contracts also increase our exposure to the risk of cost overruns. When bidding on proposals involving fixed- price contracts, we rely heavily on our estimates of costs and the time required to complete the associated projects and make assumptions regarding technical issues. Our failure to accurately estimate these costs or the resources and technology necessary to perform these contracts, or to effectively manage and control our costs during performance of work could result, and in some instances has resulted, in reduced profits or in losses. More generally, any increased or unexpected costs or unanticipated delays in connection with performing our contracts (including costs and delays caused by factors outside of our control) could make our contracts less profitable than expected. We may acquire businesses, and these transactions involve numerous risks and uncertainties that could adversely impact ongoing operations. As part of our operating strategy, we selectively pursue acquisitions. These transactions pose many risks, including: • • • • • • our inability to identify suitable acquisition candidates at prices we consider attractive; our inability to compete successfully for an identified acquisition candidate, consummate an acquisition or accurately estimate the financial effect of acquisitions on our business; difficulty retaining an acquired company's key employees, customers or contracts; difficulty integrating acquired businesses, resulting in unforeseen difficulties and greater expense than anticipated; our failure to discover or adequately assess liabilities of a business that we acquire; and the need to record write-downs from future impairments of intangible assets, which could reduce our future reported earnings. 10 Acquired entities may not achieve to the level of profitability or revenue that we anticipate. Additionally, we may not realize anticipated synergies. If our acquisitions perform poorly, our business and financial results could be adversely affected. Congress may fail to approve budgets on a timely basis for the federal agencies we support which could delay procurement of our services and solutions and cause us to lose future revenues. On an annual basis, Congress must approve budgets that govern spending by the federal agencies that we support. In years when Congress is not able to complete its budget process before the end of the government fiscal year on September 30, Congress typically funds government operations pursuant to a continuing resolution, which allows federal government agencies to operate at the spending levels approved in the previous budget cycle. When the government operates under a continuing resolution, funding we expect to receive from customers for current work may be delayed and new initiatives may be delayed or even canceled. The government's failure to complete its budget process, or to fund government operations pursuant to a continuing resolution, may result in a federal government shutdown. A prolonged delay in Congressional budget approval could delay our customers’ procurement of our services and adversely impact our business and results of operations. Legal and Regulatory Risks U.S. government contracts contain provisions giving our customers a variety of rights that are unfavorable to us, including the ability to terminate a contract at any time for convenience. U.S. government contracts contain provisions and are subject to laws and regulations that provide the government with rights and remedies not typically found in commercial contracts. Among other rights, these contracts give the government the ability to: • • • • • • • terminate existing contracts for convenience, as well as for default; reduce orders under, or otherwise modify, contracts or subcontracts; decline to exercise an option to renew multi-year contracts or issue task orders under multiple award contracts; suspend or debar us from doing business with the U.S. government or with a government agency; terminate our facility security clearances and thereby prevent us from receiving classified contracts; claim rights in products and systems produced by us; and control or prohibit the export of our products and services. If the government terminates a contract for convenience, we may recover only our incurred or committed costs, settlement expenses and profit on work completed prior to the termination. If the government terminates a contract for default, we may not even recover those amounts and may be held liable for excess costs incurred by the government in procuring undelivered items and services from another source. If one of our government customers were to unexpectedly terminate, cancel or decline to exercise an option to renew one or more of our significant contracts or programs, our revenues and operating results would be materially harmed. We are subject to complex laws and regulations, and if we fail to comply with these laws and regulations, we could be subject to severe penalties and sanctions and harm our business. As a government contractor, we are subject to numerous laws and regulations that govern how we conduct business with our customers. The following are among the more noteworthy laws and regulations: • • • • • • the Federal Acquisition Regulation and the Defense Federal Acquisition Regulation Supplement, which comprehensively regulate the formation, administration and performance of U.S. government contracts; Truthful Cost or Pricing Data, which requires certification and disclosure of all cost and pricing data in connection with contract negotiations; the Cost Accounting Standards and Cost Principles, which impose accounting requirements that govern our right to reimbursement under certain cost-reimbursable U.S. government contracts; laws, regulations and executive orders restricting the use and dissemination of information classified for national security purposes and the export of certain products, services and technical data; U.S. export controls, which apply when we engage in international work; the Foreign Corrupt Practices Act; and 11 • the False Claims Act, which prohibits the submission of fraudulent claims to the government for payment or approval. Actions under the False Claims Act may be brought by either the government or by individuals on behalf of the government (who may then share a portion of any recovery). If we fail to comply with these laws and regulations, we may be subject to contractual damages, fines, civil or criminal penalties or administrative sanctions, and could harm our reputation. For more severe misconduct, sanctions and penalties may include the termination of contracts, forfeiture of profits, the triggering of price reduction clauses, suspension of payments, fines and the suspension or debarment from doing business with federal government agencies, any of which could adversely affect our business, financial condition, operating results and future prospects. Unfavorable results of U.S. government audits or other investigations could adversely affect our profitability, harm our reputation and relationships with our customers or impair our ability to win new contracts. The Defense Contract Audit Agency (DCAA), Defense Contract Management Agency (DCMA) and other government agencies routinely audit and investigate government contracts and contractor systems. These agencies review our contract performance, cost structure and compliance with applicable laws, regulations and standards. The DCAA and DCMA also review the adequacy of, and compliance with, internal control systems and policies, including accounting, purchasing, estimating, compensation and management information systems. Allegations of impropriety or deficient controls could harm our reputation or influence the award of new contracts. Any costs found to be improperly allocated to a specific contract will not be reimbursed, while such costs already reimbursed must be refunded. If our internal control systems or policies are found to be non-compliant or inadequate, payments may be withheld or suspended, or we may be subject to increased government scrutiny and approval requirements that could delay or adversely affect our ability to invoice and receive timely payment for services we perform on our contracts. Adverse findings by DCAA or DCMA may also impair our ability to compete for and win new contracts with the U.S. government. We face risks associated with our international business, and our business operations in foreign countries involve considerable risks and hazards. Our business operations are subject to a variety of risks associated with conducting business internationally, including, changes in or interpretations of foreign laws or policies that may adversely affect the performance of our services; political instability in foreign countries; business practices and customs that are unfamiliar or inconsistent with business practices in the U.S. We also provide services to the U.S. government in foreign countries that may be experiencing political unrest, war or In connection with these deployments, we may be exposed to increased risk of incurring liabilities arising from terrorism. incidents involving our employees or third parties. We may also incur additional costs in connection with such deployments, such as increased insurance costs, the cost of liabilities that are in excess of or not covered by our insurance policies, or the costs of repatriation of our employees or executives for reasons beyond our control. Risks Related to Our Stock Our quarterly operating results may fluctuate. Our quarterly revenues and operating results may fluctuate as a result of a number of factors, many of which are outside of our control. For these reasons, comparing our operating results on a period-to-period basis may be of limited significance in some cases. In addition to the risk factors already identified in this section of our Form 10-K, a number of additional factors could cause our revenues, cash flows and operating results to vary from quarter-to-quarter, including: • • • • fluctuations in revenues earned on fixed-price contracts and contracts with a performance-based fee structure; timing of significant bid and proposal costs; seasonal or quarterly fluctuations in our workdays and staff utilization rates; and changes in the volume of purchase requests from customers for equipment and materials. Because most of our expenses are fixed, cash flows from our operations may vary significantly as a result of changes in the level of services we provide under existing contracts, as well as the number of contracts that are commenced, completed or terminated during any quarter. Depending on the nature of the contract, we may incur significant operating expenses during the start-up and early stages of large contracts and not receive corresponding payments from the customer in that same quarter. We may also incur significant or unanticipated expenses when a contract expires, terminates or is not renewed. 12 We may change our dividend policy in the future. We have maintained a regular cash dividend program since 2011. We anticipate continuing to pay quarterly dividends during 2021. However, any future payment of dividends, including the timing and amount of any such dividends, is at the discretion of our Board of Directors and may depend upon our earnings, liquidity, financial condition, alternate capital deployment opportunities or any other factors that our Board of Directors considers relevant. A change in our regular cash dividend program could have an adverse effect on the market price of our common stock. Mr. Pedersen, Chairman Emeritus, effectively controls us, and his interests may not be aligned with those of other stockholders. As of December 31, 2020, Mr. Pedersen owned approximately 33% of our total outstanding shares of common stock. Holders of our Class B common stock are entitled to ten votes per share, while holders of our Class A common stock are entitled to only one vote per share. As of December 31, 2020, Mr. Pedersen beneficially owned 13,176,695 shares of Class B common stock and controlled approximately 83% of the combined voting power of our stock. Accordingly, Mr. Pedersen controls the vote on substantially all matters submitted to a vote of our stockholders. As long as Mr. Pedersen beneficially owns a majority of the combined voting power of our common stock, he will have the ability, without the consent of our public stockholders, to elect all members of our Board of Directors and to control our management and affairs. Mr. Pedersen's voting control may have the effect of preventing or discouraging transactions involving an actual or a potential change of control of us, regardless of whether a premium is offered over then-current market prices. Mr. Pedersen will also be able to cause a change of control of us. Provisions in our charter documents and Delaware law may inhibit potential acquisition bids that our stockholders may consider favorable, and the market price of our Class A common stock may be lower as a result. There are provisions in our certificate of incorporation and bylaws that make it more difficult for a third party to acquire, or attempt to acquire, control of us, even if a change of control were considered favorable by our stockholders. Among the provisions that could have an anti-takeover effect, are provisions relating to the following: the high vote nature of our Class B common stock; the ability of our Board to issue preferred stock; the inability of stockholders to take action by written consent; and advance notice requirements relating to director nominations or other proposals submitted by our stockholders. General Risk Factors Changes in tax law could adversely impact our results of operations. We are subject to taxation in the U.S. and certain other foreign jurisdictions. Any future changes in applicable federal, state and local, or foreign tax laws and regulations or their interpretation or application, including those that could have a retroactive effect, could result in us incurring additional tax liabilities in the future. Any final determination of tax audits or related litigation may be materially different than our current provisional amounts, which could materially affect our tax obligations and effective tax rate. Goodwill represents a significant asset on our balance sheet, and changes in future business conditions could cause these investments to become impaired, requiring substantial write-downs that would reduce our operating income. As of December 31, 2020, our goodwill was $1.2 billion. The amount of our recorded goodwill may substantially increase in the future as a result of any acquisitions that we make. We evaluate the recoverability of recorded goodwill amounts annually, or when evidence of potential impairment exists. Impairment analysis is based on several factors requiring judgment and the use of estimates, which are inherently uncertain and based on assumptions that may prove to be inaccurate. Additionally, material changes in our financial outlook, as well as events outside of our control, such as deteriorating market conditions for companies in our industry, may indicate a potential impairment. When there is an impairment, we are required to write down the recorded amount of goodwill, which is reflected as a charge against operating income. Item 1B. Unresolved Securities and Exchange Commission Staff Comments We have not received any written comments from the SEC staff regarding our periodic or current reports under the Exchange Act that remain unresolved. 13 Item 2. Properties We do not own any facilities or real estate that are material to our operations. Item 3. Legal Proceedings We are subject to certain legal proceedings, government audits, investigations, claims and disputes that arise in the ordinary course of our business. Like most large government defense contractors, our contract costs are audited and reviewed on a continual basis by an in-house staff of auditors from the DCAA. In addition to these routine audits, we are subject from time- to-time to audits and investigations by other agencies of the U.S. government. These audits and investigations are conducted to determine if our performance and administration of our government contracts are compliant with contractual requirements and applicable federal statutes and regulations. An audit or investigation may result in a finding that our performance, systems and administration are compliant or, alternatively, may result in the government initiating proceedings against us or our employees, including administrative proceedings seeking repayment of monies, suspension and/or debarment from doing business with the U.S. government or a particular agency or civil or criminal proceedings seeking penalties and/or fines. Audits and investigations conducted by the U.S. government frequently span several years. Although we cannot predict the outcome of these and other legal proceedings, investigations, claims and disputes, based on the information now available to us, we do not believe the ultimate resolution of these matters, either individually or in the aggregate, will have a material adverse effect on our business, prospects, financial condition or operating results. Item 4. Mine Safety Disclosures Not applicable. 14 PART II Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities Market Information Our Class A common stock has been quoted on the Nasdaq Stock Market under the symbol “MANT” since our initial public offering on February 7, 2002. There is no established public market for our Class B common stock. As of February 17, 2021, there were 59 holders of record of our Class A common stock and 3 holders of record of our Class B common stock. The number of holders of record of our Class A common stock is not representative of the number of beneficial holders because many of the shares are held by depositories, brokers or nominees. Dividend Policy During fiscal years 2020 and 2019, we declared and paid quarterly dividends, each in the amount of $0.32 and $0.27 per share, respectively, on all issued and outstanding shares of common stock. For 2021, we anticipate we will continue paying quarterly dividends, and on February 17, 2021, the Board of Directors declared a quarterly cash dividend in the amount of $0.38 per share; however any future dividends declared will be at the discretion of our Board of Directors and will depend, among other factors, upon our earnings, liquidity, financial condition, alternate capital allocation opportunities or any other factors our Board of Directors deems relevant. Recent Sales of Unregistered Securities We did not issue or sell any securities in fiscal year 2020 that were not registered under the Securities Act of 1933. Equity Compensation Plan Information Information regarding our equity compensation plans and the securities authorized for issuance thereunder is incorporated by reference in Item 12 “Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.” Purchase of Equity Securities We did not purchase equity securities during the year ended December 31, 2020. 15 Performance Graph The stock performance graph compares the cumulative total shareholder return of our common stock to the NASDAQ Composite-Total Returns Index, Standard & Poor's MidCap 400 Index, Russell 2000 Index and Standard & Poor's 1500 IT Consulting & Services Index. The period measured is December 31, 2015 to December 31, 2020. The graph assumes an investment of $100 in our common stock and each of the indices with reinvestment of all dividends. Comparison of 5 Year Cumulative Total Return Assumes Initial Investment of $100 December 31, 2020 e u l a V x e d n I 340 320 300 280 260 240 220 200 180 160 140 120 100 80 2015 2016 2017 2018 2019 2020 ManTech International Corporation NASDAQ Composite-Total Returns Index Standard & Poor's MidCap 400 Index Russell 2000 Index Standard & Poor's 1500 IT Consulting & Services Index 16 Item 6. Selected Financial Data The selected financial data presented for each of the five years ended December 31, 2020 is derived from our audited consolidated financial statements. The selected financial data presented should be read in conjunction with our consolidated financial statements, the notes to our consolidated financial statements and Item 7 “Management's Discussion and Analysis of Financial Condition and Results of Operations.” Statement of Income Data: Revenues Operating income Net income Basic earnings per share (Class A and B) Diluted earnings per share (Class A and B) Dividend per share Balance Sheet Data: Working capital Goodwill (4) Total assets Long term debt 2020 Year Ended December 31, 2019 (1) 2018 (2) (in thousands, except per share amounts) 2017 (3) 2016 $ 2,518,384 $ 2,222,559 $ 1,958,557 $ 1,717,018 $ 1,601,596 $ $ $ $ $ 158,049 120,530 2.99 2.97 1.28 $ $ $ $ $ 138,325 113,890 2.85 2.83 1.08 $ $ $ $ $ 112,742 82,097 2.08 2.06 1.00 $ $ $ $ $ 98,194 114,141 2.94 2.91 0.84 $ 147,566 $ 154,753 $ 196,652 $ 138,879 $ 1,237,894 $ 1,191,259 $ 1,085,806 $ 1,084,560 $ $ $ $ $ $ $ 90,963 56,391 1.48 1.47 0.84 229,659 955,874 $ 2,213,664 $ 2,107,914 $ 1,803,871 $ 1,744,475 $ 1,598,464 $ 15,000 $ 36,500 $ 7,500 $ 31,000 $ — (1) On January 1, 2019, we adopted Accounting Standards Codification (ASC) 842, Leases, using the modified retrospective method at the beginning of the period of adoption, January 1, 2019, through the recognition of a lease obligation and corresponding right of use asset. Results for reporting periods beginning after January 1, 2019 are presented under ASC 842, while prior periods amount were not adjusted and continue to be reported in accordance with ASC 840, Leases. (2) On January 1, 2018, we adopted ASC 606, Revenue from Contracts with Customers, using the modified retrospective method applied to those contracts that were not substantially complete as of January 1, 2018. Results for reporting periods beginning after January 1, 2018 are presented under ASC 606, while prior period amounts were not adjusted and continue to be reported in accordance with ASC 605, Revenue Recognition. (3) The Tax Cuts and Jobs Act, enacted on December 22, 2017, reduces the U.S. corporate tax rate from 35% to 21% beginning in 2018. Due to the enactment of the Tax Cuts and Jobs Act, our income tax expense was reduced by $50.6 million for the year ended December 31, 2017 from the re-measurement of our existing deferred tax assets and liabilities. In aggregate, these acquisitions have added $318.3 million in (4) Over the past five years, we completed 7 acquisitions. goodwill. For additional information on our recent acquisitions, see Note 5 to our consolidated financial statements in Item 8. Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations The following discussion of our financial condition and results of operations should be read together with the consolidated financial statements and the notes to those statements included in Item 8 “Financial Statements and Supplementary Data." This discussion contains forward-looking statements that involve risks and uncertainties. For a description of these forward-looking statements, refer to Part I “Cautionary Note Regarding Forward-Looking Statements.” A description of factors that could cause actual results to differ materially from the results we anticipate include, but are not limited to, those discussed in Item 1A “Risk Factors,” as well as those discussed elsewhere in this Annual Report. Overview We provide mission-focused technology solutions and services for U.S. defense, intelligence community and federal civilian agencies. We excel in full-spectrum cyber, secure mission & enterprise IT, advanced data analytics, software and systems development, intelligent systems engineering, intelligence mission support and mission operations. 17 Approximately 98% of our revenues during the year ended December 31, 2020 were generated from contracts with the U.S. government, or through prime contractors supporting the U.S. government. The U.S. government is the largest consumer of services and solutions in the U.S. In government fiscal year (GFY) 2020, the U.S. government obligated approximately $393 billion on contracted services, a 10% increase from the prior year. Our business is impacted by the overall U.S. government budget and the alignment of our capabilities and offerings with the U.S. government's spending priorities. The Department of Defense (DoD) is the largest purchaser of services and solutions in the U.S. government. The COVID-19 Pandemic The global outbreak of the COVID-19 pandemic, along with various measures that local, state and federal governments have adopted to mitigate its impact, have required us to make changes to our operations to enable our employees to continue supporting our customers' mission-critical needs in this period of disruption. As a result of travel restrictions, social distancing guidelines and other efforts that have been adopted by public health officials to mitigate the impact of the COVID-19 pandemic, we have made changes to our operating schedules and staffing plans to accommodate these restrictions while maintaining the ability of our employees to continue to support and work with our customers to the maximum extent possible. The changes include the implementation of telework or other means of remote work for our employees, who support both mission-critical programs and our internal support organization. With respect to our impacted programs that, by their nature, cannot be supported remotely, we have accommodated those customers who have implemented shiftwork or other mitigation protocols by maintaining our workforce in a “mission ready” state. On March 27, 2020, the Coronavirus Aid, Relief and Economic Security (CARES) Act was enacted. The CARES Act includes a provision (Section 3610) under which government contractors can seek reimbursement for employee's salaries when they are prevented from accessing worksites or are subject to reduced work schedules and can't telecommute. The precise application of this provision, including what type of costs will be reimbursed, the earliest date cost-reimbursement will be applicable, and whether fee recovery will be included in the reimbursement, are determinations being made at the individual government agency or contract level. Currently, our customers are reimbursing costs incurred without fee. The fee impacts were largely offset by increases related to increased labor utilization (due to reductions in the use of paid time off) and reduced indirect spending due to travel restrictions imposed in response to the pandemic. On December 27, 2020, Congress passed, and the President signed into law the Consolidated Appropriations Act of 2021. The Act funds the federal government through GFY 2021 and contains $696 billion of funding for defense. Additionally, the Act extends the reimbursement period for Section 3610 of the CARES Act through March 31, 2021. We are continuing to monitor the impacts of the pandemic and the rollout of the vaccine to the population. We cannot predict the duration of the pandemic nor the timing and impact of the vaccine, however, an extended duration of the pandemic may have adverse impact on our results of operations. Acquisitions We continually monitor U.S. government spending and budgetary priorities to align our investments in new capabilities to drive organic growth. We will selectively pursue acquisitions that broaden our domain expertise and service offerings and/or establish relationships with new customers. In 2020, we acquired Minerva Engineering and Tapestry Technologies. Minerva Engineering is a leading provider in advanced cybersecurity solutions focused on risk and vulnerability assessment, incident response, cyber intrusion detection, and wireless signal discovery. Tapestry Technologies provides unique insight and cybersecurity solutions to the U.S. Defense Information Systems Agency (DISA) and the Department of Defense (DoD). Since going public in 2002, we have acquired and integrated 32 businesses into our operations. Pricing Our industry remains competitive on price. While there has been a trend away from the lowest-price technically acceptable procurement model for a majority of our customers, contracts continue to be awarded through a competitive bidding process (including indefinite delivery, indefinite quantity and other multi-award contracts), which could increase pricing pressure. To ensure our cost structure remains competitive, we continually evaluate and adjust our levels of indirect spending to stay in line with the expected business opportunities. Our industry also remains competitive with respect to attracting and retaining employees with the necessary skills and security clearances to perform certain services that are a priority for our customers. We classify indirect costs incurred as cost of services and general and administrative expenses in the same manner as such costs are defined in our disclosure statements under the government's Cost Accounting Standards. Over time, we may change 18 how certain indirect costs are allocated based on organizational changes and to maintain competitive cost structures. These changes may result in certain costs shifting between cost of services and general and administrative expenses from year to year. Revenues Substantially all of our revenues are derived from services and solutions provided to the U.S. government or to prime contractors supporting the U.S. government, including services provided by our employees and our subcontractors, and solutions that include third-party hardware and software that we purchase and integrate as a part of our overall solutions. Customer requirements may vary from period-to-period depending on specific contract and customer requirements. We provide our services and solutions under three types of contracts: cost-reimbursable; time-and-materials; and fixed- price. In general, cost-reimbursable contracts are the least profitable of our government contracts but offer the lowest risk of loss. Under time-and-materials contracts, to the extent that our actual labor costs are higher or lower than the billing rates under the contract, our profit under the contract may either be greater or less than we anticipated or we may suffer a loss under the contract. In general, we realize a higher profit margin on work performed under time-and-materials contracts than cost- reimbursable contracts. Fixed-price contracts generally offer higher profit margin opportunities but can involve greater financial risk because we bear the impact of cost overruns in return for the full benefit of any cost savings. Cost of Services Cost of services primarily includes direct costs incurred to provide services and solutions to our customers. The most significant portion of these costs are direct labor costs, including salaries and wages, plus associated fringe benefits of our employees directly serving customers, in addition to the related management, facilities and infrastructure costs. Cost of services also includes other direct costs, such as the costs of subcontractors and outside consultants and third-party materials, including hardware or software that we purchase and provide to the customer as part of an integrated solution. Changes in the mix of services and equipment provided under our contracts can result in variability in the proportion that cost of services bears to revenues. As we typically earn higher profits on our own labor services, we expect the ratio of cost of services as a percentage of revenues to decline when our labor services mix increases relative to subcontracted labor or third- party materials. Conversely, as subcontracted labor or third-party material purchases for customers increases relative to our own labor services, we expect the ratio of cost of services as a percentage of revenues to increase. General and Administrative Expenses General and administrative expenses include the salaries and wages, plus associated fringe benefits of our employees not performing work directly for customers, and associated facilities costs. Among the functions covered by these costs are business development, bid and proposal, contracts administration, finance and accounting, legal, corporate governance and In addition, we included stock-based compensation, as well as depreciation and executive and senior management. amortization expenses related to the general and administrative function. Depreciation and amortization expenses include the depreciation of computers, furniture and other equipment, the amortization of third-party software used internally, leasehold improvements and intangible assets. Intangible assets include customer relationships and contract backlogs acquired in business combinations, and are amortized over their estimated useful lives. Interest Expense Interest expense is primarily related to interest expense incurred or accrued under our outstanding borrowings on our debt and deferred financing charges. Interest Income Interest income is primarily from cash on hand and late invoice payments by the government. 19 Results of Operations Year Ended December 31, 2020 Compared to Year Ended December 31, 2019 The following table sets forth certain items from our consolidated statements of income and the relative percentages that certain items of expense and earnings bear to revenues as well as the year-over-year change from December 31, 2019 to December 31, 2020. Year Ended December 31, 2020 2019 2020 2019 Dollars Percentages (dollars in thousands) Year-to-Year Change 2019 to 2020 Dollars Percent $ 2,518,384 $ 2,222,559 2,138,791 1,893,461 100.0 % 84.9 % 100.0 % $ 295,825 85.2 % 245,330 REVENUES Cost of services General and administrative expenses OPERATING INCOME Interest expense Interest income Other income (expense), net INCOME FROM OPERATIONS BEFORE INCOME TAXES AND EQUITY METHOD INVESTMENTS Provision for income taxes Equity in earnings (losses) of unconsolidated subsidiaries 221,544 158,049 (1,900) 247 1 190,773 138,325 (2,594) 450 (83) 156,397 (35,865) 136,098 (22,212) (2) 4 8.8 % 6.3 % 0.1 % — % — % 6.2 % 1.4 % — % 4.8 % 8.6 % 6.2 % 0.1 % — % — % 6.1 % 1.0 % — % 13.3 % 13.0 % 16.1 % 14.3 % (26.8)% (45.1)% 101.2 % 30,771 19,724 (694) (203) 84 20,299 13,653 14.9 % 61.5 % (6) (150.0)% 5.1 % $ 6,640 5.8 % NET INCOME $ 120,530 $ 113,890 Revenues The primary drivers of the increase in our revenues are revenues from new contract awards, growth on existing contracts and the acquisitions we completed during the year. These increases were offset by contracts and tasks that ended during the year and reduced scope of work on some contracts including contracts with variable material purchase requirements. We expect revenues to increase in 2021 due to recent and future new contract awards and growth on existing programs. Cost of services The increase in cost of services was primarily due to increases in revenues. As a percentage of revenues, direct labor costs were 49% and 47% for the years ended December 31, 2020 and 2019, respectively. As a percentage of revenues, other direct costs, which include subcontractors and third party equipment and materials used in the performance of our contracts, were 36% and 39% for the years ended December 31, 2020 and 2019, respectively. Due to the pandemic, we have seen an increase in labor utilization as our workforce has reduced the amount of paid time off taken. As a result of travel restrictions and other protocols to mitigate the spread of the virus, we have incurred less travel related other direct costs. Depending on the duration of the pandemic, we may continue to experience a similar shift in our mix of direct labor and other direct costs. Due to an allocation change of certain indirect costs, we expect cost of services as a percentage of revenue to increase in 2021. General and administrative expenses The increase in general and administrative expenses was primarily the result of investments we made to support the growth of our business, infrastructure improvements, bad debt expense, amortization of acquisition related intangibles and legal matters. These increases were partially offset by reduced travel, conference expenses, and other indirect expenses due to the impacts of COVID. As a percentage of revenues, general and administrative expenses increased for the year ended December 31, 2020 as compared to the same period in 2019. In 2021, due to changes in the allocation basis of certain indirect costs, we expect general and administrative expenses to decrease as a percentage of revenue. 20 Provision for income taxes Our effective tax rate is affected by recurring items, such as the relative amount of income we earn in various taxing jurisdictions and their tax rates. It is also affected by discrete items that may occur in any given year, but are not consistent from year-to-year. Our effective income tax rate was 23% and 16% for the years ended December 31, 2020 and 2019, respectively. During 2019, we completed a project to improve the method by which we identify expenditures that qualify for the research and development tax credit. The benefit of the improved method for identifying research and development credits was applied for tax years 2015 through 2019 and included in the effective income tax rate for the year ended December 31, 2019. For the year ended December 31, 2020, the effective tax rate increased because the benefit for the research and development tax credit was only for the current year. We expect our effective tax rate to slightly increase in 2021. For additional information concerning the research and development tax credit, see Note 13 to our consolidated financial statements in Item 8. Year Ended December 31, 2019 Compared to Year Ended December 31, 2018 To review the comparison of our results of operations for the fiscal year ended December 31, 2019 with our results of operations for the fiscal year ended December 31, 2018, please refer to the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2019. Backlog For the years ended December 31, 2020 and 2019 our backlog was $10.2 billion and $9.1 billion, respectively, of which $1.2 billion and $1.3 billion, respectively, was funded backlog. The increase in our backlog is due to our receipt of new contract awards and our acquisitions. We believe our backlog, together with new contract awards, will support continued growth in our business. Backlog represents estimates that we calculate on a consistent basis. For additional information on how we compute backlog, see “Backlog” in Item 1 “Business.” Liquidity and Capital Resources Historically, our primary liquidity needs have been the financing of acquisitions, working capital, payment under our cash dividend program and capital expenditures. Our primary sources of liquidity are cash provided by operations and our revolving credit facility. On December 31, 2020, our cash and cash equivalents balance was $41.2 million. There were $15.0 million in outstanding borrowings under our revolving credit facility at December 31, 2020. At December 31, 2020, we were contingently liable under letters of credit totaling $6.2 million, which reduced our ability to borrow under our revolving credit facility by that amount. The maximum available borrowings under our revolving credit facility at December 31, 2020 were $478.8 million. Generally, cash provided by operating activities is adequate to fund our operations, including payments under our regular cash dividend program. Due to short-term fluctuations in our cash flows and level of operations, it may become necessary from time-to-time to increase borrowings under our revolving credit facility to meet cash demands. Cash Flows from Operating Activities Our operating cash flow is primarily affected by our ability to invoice and collect from our clients in a timely manner, our ability to manage our vendor payments and the overall profitability of our contracts. We bill most of our customers monthly after services are rendered. Our accounts receivable days sales outstanding (DSO) were 56 and 59 for the quarters ended December 31, 2020 and 2019, respectively. For the years ended December 31, 2020 and 2019, our net cash flows from operating activities were $247.2 million and $221.4 million, respectively. The increase in net cash flows from operating activities during the year ended December 31, 2020 when compared to the same period in 2019 was primarily due to an increase in non-cash operating expenses and the timing of accrued salaries and related expenses. Cash Used in Investing Activities Our cash used in investing activities consists primarily of business combinations, purchases of property and equipment and investments in capitalized software for internal use. For the years ended December 31, 2020 and 2019, our net cash used in investing activities were $150.1 million and $214.9 million, respectively. For the year ended December 31, 2020, our net cash used in investing activities were primarily due to the acquisitions of Minerva Engineering and Tapestry Technologies and the 21 purchase of equipment to support our managed IT service contracts and infrastructure investments. For the year ended December 31, 2019, our net cash used in investing activities were primarily due to the acquisitions of Kforce Government Solutions and H2M Group and the purchase of equipment to support managed IT service contracts, infrastructure and capitalized software for internal use. Cash Flows Used in Financing Activities For the years ended December 31, 2020 and 2019, our net cash used in financing activities were $64.8 million and $2.9 million, respectively. For the year ended December 31, 2020, our net cash used in financing activities were primarily due to dividends paid and net repayments under our revolving credit facility, offset by the proceeds from the exercise of stock options. For the year ended December 31, 2019, our net cash used in financing activities was primarily due to dividends paid, offset by net borrowings under our revolving credit facility to fund our acquisitions this year and proceeds from the exercise of stock options. Revolving Credit Facility We maintain a credit agreement with a syndicate of lenders led by Bank of America, N.A., as sole administrative agent. The credit agreement provides for a $500 million revolving credit facility, with a $75 million letter of credit sublimit and a $30 million swing line loan sublimit. The credit agreement also includes an accordion feature that permits us to arrange with the lenders for the provision of additional commitments. The maturity date is August 17, 2022. Borrowings under our credit agreement are collateralized by substantially all of our assets of us and those of our Material Subsidiaries (as defined in the credit agreement) and bear interest at one of the following variable rates as selected by us at the time of borrowing: a London Interbank Offer Rate (LIBOR) based rate plus market spreads (1.25% to 2.25% based on our consolidated total leverage ratio) or Bank of America's base rate plus market spreads (0.25% to 1.25% based on our consolidated total leverage ratio). The terms of the credit agreement permit prepayment and termination of the loan commitments at any time, subject to certain conditions. The credit agreement requires us to comply with specified financial covenants, including the maintenance of certain consolidated leverage ratios and a certain consolidated coverage ratio. The credit agreement also contains various covenants, including affirmative covenants with respect to certain reporting requirements and maintaining certain business activities, and negative covenants that, among other things, may limit or impose restrictions on our ability to incur liens, incur additional indebtedness, make investments, make acquisitions and undertake certain other actions. As of, and during the fiscal years ending December 31, 2020 and 2019, we were in compliance with our financial covenants under the credit agreement. There was $15.0 million and $36.5 million outstanding on our revolving credit facility at December 31, 2020 and 2019, respectively. Capital Resources We believe the capital resources available to us from cash on hand, our remaining capacity under our revolving credit facility, and cash from our operations are adequate to fund our anticipated cash requirements for at least the next year. We anticipate financing our external growth from acquisitions and our longer-term internal growth through one or more of the following sources: cash from operations; use of our revolving credit facility; and additional borrowings of debt or issuance of equity. Cash Management To the extent possible, we invest our available cash in short-term, investment grade securities in accordance with our investment policy. Under our investment policy, we manage our investments in accordance with the priorities of maintaining the safety of our principal, maintaining the liquidity of our investments, maximizing the yield on our investments and investing our cash to the fullest extent possible. Our investment policy provides that no investment security can have a final maturity that exceeds six months and that the weighted average maturity of the portfolio cannot exceed 60 days. Cash and cash equivalents include cash on hand, amounts due from banks and short-term investments with maturity dates of three months or less at the date of purchase. Dividend During the years ended December 31, 2020 and 2019, we declared and paid quarterly dividends in the amount of $0.32 and $0.27 per share on both classes of common stock. On February 17, 2021, we declared a quarterly cash dividend in the amount of $0.38 per share, to be paid on March 26, 2021. While we expect to continue the regular cash dividend program, any future 22 dividends declared will be at the discretion of our Board of Directors and will depend, among other factors, upon our results of operations, financial condition and cash requirements, as well as such other factors our Board of Directors deems relevant. Off-Balance Sheet Arrangements In the ordinary course of business, we use letters of credit to satisfy certain contractual terms with our customers. As of December 31, 2020, $6.2 million in letters of credit were issued but undrawn. We have an outstanding performance bond in connection with a contract between ManTech MENA, LLC and Jadwalean International Operations and Management Company to fulfill technical support requirements for the Royal Saudi Air Force. This performance bond is guaranteed by a letter of credit in the amount of $5.7 million. Critical Accounting Estimates and Policies Critical accounting policies are defined as those that are reflective of significant judgments and uncertainties, and potentially result in materially different results under different assumptions and conditions. Application of these policies is particularly important to the portrayal of our financial condition and results of operations. The discussion and analysis of our financial condition and results of operations are based on our consolidated financial statements, which have been prepared in accordance with U.S. generally accepted accounting principles (GAAP). The preparation of these consolidated financial statements requires management to make estimates and judgments that affect the reported amount of assets, liabilities, revenues and expenses. Actual results may differ from these estimates under different assumptions or conditions. Our significant accounting policies, including the critical policies listed below, are more fully described in the notes to our consolidated financial statements included in this report. Revenue Recognition and Cost Estimation We account for a contract when both we and the customer approve and commit; our rights and those of the customer are identified, payment terms are identified; the contract has commercial substance; and collectability of consideration is probable. At contract inception, we identify the distinct goods or services promised in the contract, referred to as performance obligations. Then we determine the transaction price for the contract; the consideration to which we can expect in exchange for the It is common for our promised goods or services in the contract. The transaction price can be a fixed or variable amount. contracts to contain award fees, incentive fees or other provisions that can either increase or decrease the transaction price. These variable amounts generally are awarded upon achievement of certain performance metrics, program milestones or cost targets and can be based upon customer discretion. We estimate variable consideration as the most likely amount to which we expect to be entitled. We include estimated amounts in the transaction price when it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Our estimates of variable consideration and determination of whether to include estimated amounts in the transaction price are based largely on an assessment of our anticipated performance and historical, current and forecasted information that is reasonably available to us. The transaction price is allocated to each distinct performance obligation using our best estimate of the standalone selling price for each distinct good or service promised in the contract. The primary method used to estimate standalone selling price is the expected cost plus a margin approach, under which we forecast our expected costs of satisfying a performance obligation and then add an appropriate margin for that distinct good or service promised. Revenue is recognized when, or as, the performance obligation is satisfied. We recognize revenue over time when there is a continuous transfer of control to our customer. For our U.S. government contracts, this continuous transfer of control to the customer is supported by clauses in the contract that allow the U.S. government to unilaterally terminate the contract for convenience, pay us for costs incurred plus a reasonable profit and take control of any work in process. When control is transferred over time, revenue is recognized based on the extent of progress towards completion of the performance obligation. Based on the nature of the products and services provided in the contract, we use our judgment to determine if an input measure or output measure best depicts the transfer of control over time. For services contracts, we typically satisfy our performance obligations as services are rendered. We typically use a cost-based input method to measure progress. Contract costs include labor, material and allocable indirect expenses. Revenue is recognized proportionally as contract costs are incurred plus estimated fees. For time-and-material contracts, we bill the customer per labor hour and per material, and revenue is recognized in the amount invoiced since the amount corresponds directly to the value of our performance to date. For stand-ready service contracts, a time-elapsed output method is used to measure progress, and revenue is recognized straight-line over the term of the contract. If a contract does not meet the criteria for recognizing revenue over time, we recognize revenue at a point in time. Revenue is recognized at the point in time when control of the good or service is transferred to our customer. We consider control to transfer when we have a present right to payment and our customer has legal title. Determining a measure of progress and when control transfers requires us to make judgments that affect the timing of when revenue is recognized. Essentially all of our contracts satisfy their performance obligations over time. 23 Contracts are often modified to account for changes in contract specifications and requirements. Contract modifications impact the contract when the modification either creates a new performance obligation or changes the existing enforceable rights and obligations. The effect of a contract modification on the transaction price and our measure of progress for the performance obligation to which it relates is recognized as a cumulative adjustment to revenue and profit. Furthermore, a significant change in one or more estimates could affect the profitability of our contracts. We recognize adjustments in estimated profit on contracts in the period identified. The impact of adjustments in contract estimates can be reflected in either revenue or operating expenses on our consolidated statement of income. We have an Estimate at Completion process in which management reviews the progress and execution of our performance obligations. As part of this process, management reviews information including, but not limited to, any outstanding key contract matters, progress towards completion and the related program schedule, identified risks and opportunities and the related changes in estimates of revenue and costs. The risks and opportunities include management’s judgment about the ability and cost to achieve the contract milestones and other technical contract requirements. Management must make assumptions and estimates regarding labor productivity and availability, the complexity of the work to be performed, the availability of materials, the length of time to complete the performance obligation, execution by our subcontractors, the availability and timing of funding from our customer and overhead cost rates, among other variables. A significant change in one or more of these estimates could affect the profitability of our contracts. Accounting for Business Combinations, Goodwill and Other Intangible Assets The purchase price of an acquired business is allocated to the tangible assets, financial assets and separately recognized intangible assets acquired less liabilities assumed based upon their respective fair values, with the excess recorded as goodwill. Determining the fair value of assets acquired and liabilities assumed requires significant judgment, which includes, among other factors, analysis of historical performance and estimates of future performance. These factors may cause final amounts to differ materially from original estimates. In some cases, we use discounted cash flow analyses, which are based on our best estimate of future revenue, earnings and cash flows as well as our discount rate adjusted for risk. We review goodwill at least annually for impairment, or whenever events or circumstances indicate that the carrying value of long-lived assets may not be fully recoverable. We perform this review at the reporting unit level, which is one level below our one reportable segment. In reviewing goodwill for impairment, we have the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the estimated fair value of a reporting unit is less than its carrying amount. If we elect to perform a qualitative assessment and determine that it is more likely than not that the fair value of the reporting unit is less than it carry amount, then we will perform the quantitative impairment test (described below). We also may bypass the qualitative assessment for any reporting unit in any period and, proceed directly to perform the quantitative impairment test. The quantitative goodwill impairment test, used to identify both the existence of impairment and the amount of the impairment loss, compares the fair value of a reporting unit with its carrying amount, including goodwill. If the fair value of a reporting unit exceeds its carrying amount, the goodwill of the reporting unit is not impaired. If the carrying amount of a reporting unit exceeds its fair value, an impairment loss will be recognized in the amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. The fair values of the reporting units are determined based on a weighting of the income approach, market approach and market transaction approach. The income approach is a valuation technique in which fair value is based from forecasted future cash flow discounted at the appropriate rate of return commensurate with the risk as well as current rates of return for equity and debt capital as of the valuation date. The forecast used in our estimation of fair value was developed by management based on a contract basis, incorporating adjustments to reflect known contract and market considerations (such as reductions and uncertainty in government spending, pricing pressure and opportunities). The discount rate utilizes a risk adjusted weighted average cost of capital. The market approach is a valuation technique in which the fair value is calculated based on market prices realized in an actual arm's length transaction. The technique consists of undertaking a detailed market analysis of publicly traded companies that provides a reasonable basis for comparison to us. Valuation ratios, which relate market prices to selected financial statistics derived from comparable companies, are selected and applied to us after consideration of adjustments for financial position, growth, market, profitability and other factors. The market transaction approach is a valuation technique in which the fair value is calculated based on market prices realized in actual arm's length transactions. The technique consists of undertaking a detailed market analysis of merged and acquired companies that provides a reasonable basis for comparison to us. Valuation ratios, which relate market prices to selected financial statistics derived from comparable companies, are selected and applied to us after consideration of adjustments for financial position, growth, market, profitability 24 and other factors. To assess the reasonableness of the calculated reporting unit fair values, we compare the sum of the reporting units' fair values to our market capitalization (per share stock price times the number of shares outstanding) and calculate an implied control premium (the excess of the sum of the reporting units' fair values over the market capitalization), and then assess the reasonableness of our implied control premium. We have elected to perform our annual review as of October 31st of each calendar year. In addition, management monitors events and circumstances that could result in an impairment. A significant amount of judgment is involved in determining if an indicator of impairment has occurred between annual testing dates. Events that could cause the fair value of our long-lived assets to decrease include: changes in our business environment or market conditions; a material change in our financial outlook, including declines in expected revenue growth rates and operating margins; or a material decline in the market price for our stock. If any impairment were indicated as a result of a review, we would recognize a loss based on the amount by which the carrying amount exceeds the estimated fair value. As a result of the internal reorganization, the composition of the carrying amount and the resulting carrying amount of net assets of our reporting units changed, which required us to reallocate goodwill across our reporting units based on the relative fair value as of July 1, 2020. As of our annual test as of October 31, 2020, we performed a qualitative assessment to determine if it more likely than not that the estimated fair value of our reporting is less than the carrying amount. Based on our the results of our qualitative assessment, we determined it was unnecessary to perform a quantitative impairment test. Due to the many variables inherent in the estimation of a reporting unit's fair value and the relative size of our recorded goodwill, differences in assumptions may have a material effect on the results of our goodwill impairment analysis. Accounting for income taxes We account for income taxes in accordance with ASC 740, Income Taxes. Under this method, deferred income taxes are determined based on the estimated future tax effects of differences between the financial statement and tax bases of assets and liabilities given the provisions of enacted tax laws. Deferred income tax provisions and benefits are based on changes to the assets or liabilities from year-to-year. In providing for deferred taxes, we consider tax regulations of the jurisdictions in which we operate, estimates of future taxable income and available tax planning strategies. If tax regulations, operating results or the ability to implement tax-planning strategies vary, adjustments to the carrying value of deferred tax assets and liabilities may be required. Valuation allowances are recorded related to deferred tax assets based on the “more likely than not” criteria. We recognize the financial statement benefit of a tax position only after determining that the relevant tax authority would “more likely than not” sustain the position following an audit. For tax positions meeting the “more likely than not” threshold, the amount recognized in the financial statements is the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant tax authority. The determination that a tax position meets the "more likely than not" criteria requires a significant amount of judgment, which may differ significantly from what is ultimately accepted by the relevant taxing authority. Recently Issued But Not Yet Adopted Accounting Standards Updates For information on the recently issued but not yet adopted Accounting Standards Updates, see Note 2 to our consolidated financial statements in Item 8. 25 Contractual Obligations Our contractual obligations as of December 31, 2020 are as follows (in thousands): Contractual Obligations Total Payments Due By Period Less than 1 Year 1-3 Years 3-5 Years More than 5 Years Operating lease obligations (1) $ 118,311 $ 33,220 $ Debt obligations (2) Accrued defined benefit obligations (3) Finance lease obligations (1) Other long-term liabilities (4) 15,000 674 443 322 — 73 182 154 59,820 15,000 138 237 168 $ 18,237 $ 7,034 — 126 23 — — 337 1 — Total $ 134,750 $ 33,629 $ 75,363 $ 18,386 $ 7,372 (1) See Note 4 to our consolidated financial statements in Item 8 for additional information regarding leases. (2) We may elect to pay all of or a portion of this obligation earlier than contractually required. See Note 9 to our consolidated financial statements in Item 8 for additional information regarding debt and related matters. (3) Includes unfunded pension obligations related to nonqualified supplemental defined benefit pension plans for certain retired employees of an acquired company, which is included in the accrued retirement amount on our consolidated balance sheets. See Note 12 to our consolidated financial statements in Item 8 for additional information regarding retirement plans. (4) Excludes approximately $11.7 million of gross unrecognized tax benefits as we are not able to reasonably estimate the timing of future cash flows to such unrecognized tax benefits. See Note 13 to our consolidated financial statements in Item 8 for additional information regarding gross unrecognized tax benefits. Excludes finance lease liabilities-long term. Item 7A. Quantitative and Qualitative Disclosures about Market Risk Our exposure to market risk relates to changes in interest rates for borrowings under our revolving credit facility. At December 31, 2020, we had $15.0 million outstanding on our revolving credit facility. Borrowings under our revolving credit facility bear interest at variable rates. A hypothetical 10% increase in interest rates would have a $0.1 million effect on our interest expense for the year ended December 31, 2020. We do not use derivative financial instruments for speculative or trading purposes. When we have excess cash, we invest in short-term, investment grade, interest-bearing securities. Our investments are made in accordance with an investment policy. Under this policy, no investment security can have a maturity exceeding six months and the weighted average maturity of the portfolio cannot exceed 60 days. 26 Item 8. Financial Statements and Supplementary Data Index to Consolidated Financial Statements Report of Independent Registered Public Accounting Firm Consolidated Balance Sheets as of December 31, 2020 and 2019 Consolidated Statements of Income for the years ended December 31, 2020, 2019 and 2018 Consolidated Statements of Comprehensive Income for the years ended December 31, 2020, 2019 and 2018 Consolidated Statements of Changes in Stockholders' Equity for the years ended December 31, 2020, 2019 and 2018 Consolidated Statements of Cash Flows for the years ended December 31, 2020, 2019 and 2018 Notes to Consolidated Financial Statements Page 28 30 31 32 33 34 36 27 REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM To the stockholders and the Board of Directors of ManTech International Corporation Opinion on the Financial Statements We have audited the accompanying consolidated balance sheets of ManTech International Corporation and subsidiaries (the "Company") as of December 31, 2020 and 2019, the related consolidated statements of income, comprehensive income, changes in stockholders' equity, and cash flows, for each of the three years in the period ended December 31, 2020, and the related notes and the schedule listed in the Index at Item 15 (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2020 and 2019, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2020, in conformity with accounting principles generally accepted in the United States of America. We have also 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, 2020, 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 19, 2021, expressed an unqualified opinion on the Company's internal control over financial reporting. Basis for Opinion These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's 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 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 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 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 financial statements. We believe that our audits provide a reasonable basis for our opinion. Critical Audit Matter The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the audit committee and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates. Revenue from Contracts with Customers — Refer to Notes 2 and 3 to the financial statements Critical Audit Matter Description The Company recognizes revenue on contracts over time when there is a continuous transfer of control to the customer over the duration of the contract as the services are rendered. The accounting conclusions for contracts involves judgment, particularly as it relates to determining the amount, timing and presentation of revenue that will be recognized for each performance obligation within the contract, and the distinct number of performance obligations represented by the contract. On certain contracts, revenue is recognized over time using a cost-based input method that measures the extent of progress towards completion of a performance obligation. Contract costs include labor, material and allocable indirect expenses. Revenue is recognized proportionally as contract costs are incurred plus estimated fees. Management must make assumptions and estimates regarding labor productivity and availability, the complexity of the work to be performed, the availability of materials, the length of time to complete the performance obligation, execution by subcontractors, the availability and timing of funding from our customer and overhead cost rates, among other variables. A significant change in one or more of these estimates could affect the profitability of the Company’s contracts. 28 Given the judgments necessary to determine the amount, timing and presentation of revenue and to estimate total costs and fees for the performance obligations that recognize revenue using a cost-based input method, auditing such estimates required extensive audit effort due to the volume and complexity of these contracts and a high degree of auditor judgment when performing audit procedures and evaluating the results of those procedures. For all contracts, understanding and differentiating the number of performance obligations contained in the contract represented a high degree of auditor judgment because of the variety of contracts and services promised and the interrelationship among those elements. How the Critical Audit Matter Was Addressed in the Audit Our audit procedures related to management’s conclusion on amount, timing and presentation of revenue recognition, as well as the estimates of total costs and fees for the performance obligations that recognize revenue using a cost-based input method included the following, among others: • We tested the effectiveness of controls over contract revenue, including management’s controls over the initial setup of new contract arrangements and the estimates of total costs and fees for performance obligations. • We developed an expectation of revenue and compared it to the recorded balance. • For a selection of contracts we performed elements of the following for each contract: – Evaluated the terms and conditions of each contract and the appropriateness of the accounting treatment in accordance with generally accepted accounting principles by: – – – Inspecting the executed contract to test that the facts on which management’s conclusions were reached were consistent with the actual terms and conditions of the contract. Evaluating the contract within the context of the five-step model prescribed by ASC 606, Revenue from Contracts with Customers, and evaluating whether management’s conclusions were appropriate by evaluating the nature of the promises within the contract, the interrelationship of the promised services provided, the number of performance obligations identified, and which party is responsible for fulfillment. Involving industry experts in evaluating the appropriateness of management’s conclusions. the pattern by which obligations are fulfilled, – Compared the transaction price to the consideration expected to be received based on current rights and obligations under the contracts and any modifications that were agreed upon with the customers. Tested the accuracy and completeness of the costs incurred to date for the performance obligation. Evaluated the estimates of total cost and fees for the performance obligation by: – – – Comparing costs incurred to date to the costs management estimated to be incurred by that date. – Evaluating management’s ability to achieve the estimates of total cost and fees by performing corroborating inquiries with the Company’s project managers, and comparing the estimates to management’s work plans. – Comparing management’s estimates for the selected contracts to costs and fees of similar performance obligations, when applicable. – Tested the mathematical accuracy of management’s calculation of revenue for the performance obligation. • We analyzed adjustments in contract estimates recorded during the year to assess whether such adjustments were the result of changes in facts and circumstances and not estimates that were previously inaccurate. /s/ Deloitte & Touche LLP Mclean, Virginia February 19, 2021 We have served as the Company's auditor since 1999. 29 MANTECH INTERNATIONAL CORPORATION CONSOLIDATED BALANCE SHEETS (In Thousands Except Share and Per Share Amounts) December 31, 2020 2019 ASSETS $ 41,193 $ Cash and cash equivalents Receivables—net Prepaid expenses Taxes receivable—current Other current assets Total Current Assets Goodwill Other intangible assets—net Property and equipment—net Operating lease right of use assets Employee supplemental savings plan assets Investments Other assets TOTAL ASSETS LIABILITIES Accounts payable LIABILITIES AND STOCKHOLDERS' EQUITY Accrued salaries and related expenses Contract liabilities Operating lease obligations—current Accrued expenses and other current liabilities Total Current Liabilities Deferred income taxes Operating lease obligations—long term Accrued retirement Long term debt Other long-term liabilities TOTAL LIABILITIES COMMITMENTS AND CONTINGENCIES STOCKHOLDERS' EQUITY Common stock, Class A—$0.01 par value; 150,000,000 shares authorized; 27,538,474 and 27,235,860 shares issued at December 31, 2020 and 2019; 27,294,361 and 26,991,747 shares outstanding at December 31, 2020 and 2019 Common stock, Class B—$0.01 par value; 50,000,000 shares authorized; 13,176,695 and 13,187,195 shares issued and outstanding at December 31, 2020 and 2019 Additional paid-in capital Treasury stock, 244,113 and 244,113 shares at cost at December 31, 2020 and 2019 Retained earnings Accumulated other comprehensive loss TOTAL STOCKHOLDERS' EQUITY TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY See notes to consolidated financial statements. 30 400,621 26,243 21,968 6,354 496,379 1,237,894 202,231 121,296 94,825 37,848 11,549 11,642 8,854 398,976 20,030 21,996 4,878 454,734 1,191,259 196,778 85,631 117,728 36,777 11,550 13,457 $ 2,213,664 $ 2,107,914 $ 142,360 $ 138,029 123,953 37,218 30,105 15,177 348,813 141,638 80,242 36,310 15,000 12,249 634,252 275 132 545,717 (9,158) 1,042,676 (230) 97,298 27,620 29,047 7,987 299,981 131,782 103,148 35,552 36,500 10,309 617,272 272 132 525,851 (9,158) 973,767 (222) 1,579,412 1,490,642 $ 2,213,664 $ 2,107,914 MANTECH INTERNATIONAL CORPORATION CONSOLIDATED STATEMENTS OF INCOME (In Thousands Except Per Share Amounts) REVENUES Cost of services General and administrative expenses OPERATING INCOME Interest expense Interest income Other income (expense), net INCOME FROM OPERATIONS BEFORE INCOME TAXES AND EQUITY METHOD INVESTMENTS Provision for income taxes Equity in earnings (losses) of unconsolidated subsidiaries NET INCOME BASIC EARNINGS PER SHARE: Class A common stock Class B common stock DILUTED EARNINGS PER SHARE: Class A common stock Class B common stock Year Ended December 31, 2020 2019 2018 $ 2,518,384 $ 2,222,559 $ 1,958,557 2,138,791 1,893,461 1,678,100 221,544 158,049 (1,900) 247 1 156,397 (35,865) (2) 120,530 2.99 2.99 2.97 2.97 $ $ $ $ $ 190,773 138,325 (2,594) 450 (83) 136,098 (22,212) 4 113,890 2.85 2.85 2.83 2.83 $ $ $ $ $ 167,715 112,742 (2,378) 161 80 110,605 (28,530) 22 82,097 2.08 2.08 2.06 2.06 $ $ $ $ $ See notes to consolidated financial statements. 31 MANTECH INTERNATIONAL CORPORATION CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (In Thousands) NET INCOME OTHER COMPREHENSIVE INCOME (LOSS): Translation adjustments, net of tax Actuarial gain (loss) on defined benefit pension plans, net of tax Cumulative-effect adjustment for adoption of Accounting Standards Update 2018-02 Total other comprehensive income (loss) Year Ended December 31, 2020 2019 2018 $ 120,530 $ 113,890 $ 82,097 (41) 33 — (8) (77) (19) (24) (120) (27) 245 — 218 COMPREHENSIVE INCOME $ 120,522 $ 113,770 $ 82,315 See notes to consolidated financial statements. 32 MANTECH INTERNATIONAL CORPORATION CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (In Thousands) Common Stock, Class A At beginning of year Stock option exercises Stock-based compensation expense At end of year Common Stock, Class B At beginning of year At end of year Additional Paid-In Capital At beginning of year Stock option exercises Stock-based compensation expense Payment consideration to tax authority on employees' behalf At end of year Treasury Stock, at cost At beginning of year At end of year Retained Earnings At beginning of year Net income Dividends Cumulative-effect adjustment for adoption of Accounting Standards Update 2014-09 At end of year Accumulated Other Comprehensive Loss At beginning of year Translation adjustments, net of tax Actuarial gain (loss) on defined benefit pension plans, net of tax Cumulative-effect adjustment for adoption of Accounting Standard Update 2018-02 At end of year Total Stockholders' Equity 2020 December 31, 2019 2018 $ 272 $ 268 $ 2 1 275 132 132 3 1 272 132 132 263 4 1 268 132 132 525,851 506,970 492,030 10,247 11,365 (1,746) 12,892 7,492 (1,503) 12,591 5,072 (2,723) 545,717 525,851 506,970 (9,158) (9,158) 973,767 120,530 (51,621) (9,158) (9,158) 903,084 113,890 (43,207) — — 1,042,676 973,767 (222) (41) 33 — (230) (102) (77) (19) (24) (222) (9,158) (9,158) 860,027 82,097 (39,627) 587 903,084 (320) (27) 245 — (102) $ 1,579,412 $ 1,490,642 $ 1,401,194 See notes to consolidated financial statements 33 MANTECH INTERNATIONAL CORPORATION CONSOLIDATED STATEMENTS OF CASH FLOWS (In Thousands) CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES: Net income Adjustments to reconcile net income to net cash flows from operating activities: Depreciation and amortization Noncash lease expense Deferred income taxes Stock-based compensation expense Bad debt expense Contract loss reserve (Gain) loss on sale and retirement of property and equipment Equity in (earnings) losses of unconsolidated subsidiaries Change in assets and liabilities—net of effects from acquired businesses: Receivables-net Prepaid expenses Taxes receivable—current Other current assets Employee supplemental savings plan asset Other long-term assets Accounts payable Accrued salaries and related expenses Contract liabilities Accrued expenses and other current liabilities Operating lease obligations Accrued retirement Other long-term liabilities Other Net cash flow from operating activities CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES: Acquisition of businesses-net of cash acquired Purchases of property and equipment Investment in capitalized software for internal use Proceeds from corporate owned life insurance Proceeds from sale of property and equipment Deferred contract costs Proceeds from equity method investment Net cash used in investing activities CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES: Borrowings under revolving credit facility Repayments under revolving credit facility Dividends paid Proceeds from exercise of stock options Payment consideration to tax authority on employee's behalf Principal paid on financing leases Net cash used in financing activities NET CHANGE IN CASH AND CASH EQUIVALENTS CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD CASH AND CASH EQUIVALENTS, END OF PERIOD 34 Year Ended December 31, 2019 2018 2020 $ 120,530 $ 113,890 $ 82,097 70,300 28,169 9,856 11,366 5,244 (372) (172) 2 1,298 (5,963) 28 (987) (5,208) (1,827) (303) 24,666 9,149 9,248 (31,055) 758 2,010 507 247,244 (78,815) (71,129) (5,193) 4,137 869 — — (150,131) 302,500 (324,000) (51,618) 10,249 (1,746) (159) (64,774) 32,339 8,854 41,193 $ 55,879 27,619 15,739 7,493 3,000 (1,481) 171 (4) 24,660 419 (21,996) 4,060 (6,297) 97 14,707 2,796 (589) (3,857) (28,520) 4,553 9,380 (313) 221,406 (152,851) (54,795) (3,677) 21 — (3,878) 283 (214,897) 624,000 (595,000) (43,205) 12,895 (1,503) (136) (2,949) 3,560 5,294 8,854 $ 52,569 — 11,762 5,073 — — 75 (22) (87,098) (613) 18,732 (1,321) 1,754 (953) 3,904 2,095 6,110 1,423 — (3,518) 1,384 (14) 93,439 (5,279) (30,114) (5,018) 1,300 — (5,233) — (44,344) 575,500 (599,000) (39,624) 12,595 (2,723) — (53,252) (4,157) 9,451 5,294 $ SUPPLEMENTAL CASH FLOW INFORMATION Cash paid for interest Noncash investing and financing activities: Noncash investing activities Operating lease obligations arising from obtaining right of use assets Finance lease obligations arising from obtaining right of use assets $ $ $ $ 1,819 5,480 $ $ 2,436 5,981 6,459 $ 31,010 107 $ 368 $ $ $ $ 2,315 340 — — See notes to consolidated financial statements. 35 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS Years Ended December 31, 2020, 2019 and 2018 1. Description of the Business ManTech International Corporation (depending on the circumstances, “ManTech” “Company” “we” “our” “ours” or “us”) provides mission-focused technology solutions and services for U.S. defense, intelligence community and federal civilian agencies. We excel in full-spectrum cyber, secure mission & enterprise IT, advanced data analytics, software and systems development, intelligent systems engineering, intelligence mission support and mission operations. 2. Summary of Significant Accounting Policies Principles of Consolidation - Our consolidated financial statements include the accounts of ManTech International Corporation, subsidiaries we control and variable interest entities that are required to be consolidated. All intercompany accounts and transactions have been eliminated. Use of Accounting Estimates - We prepare our consolidated financial statements in conformity with U.S. GAAP, which requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates involve judgments with respect to, among other things, various future economic factors that are difficult to predict and are beyond our control. Therefore, actual amounts could differ from these estimates. Business Combinations - The accounting for our business combinations consists of allocating the purchase price to tangible and intangible assets acquired and liabilities assumed based on their estimated fair values, with the excess recorded as goodwill. We have up to one year from the acquisition date to use information as of each acquisition date to adjust the fair value of the acquired assets and liabilities, which may result in material changes to their recorded values with an offsetting adjustment to goodwill. Determining the fair value of assets acquired and liabilities assumed requires significant judgment, which includes, among other factors, analysis of historical performance and estimates of future performance. In some cases, we have used discounted cash flow analyses, which were based on our best estimate of future revenue, earnings and cash flows as well as our discount rate, adjusted for risk, and estimated attrition rates. Fair Value of Financial Instruments - The carrying value of our cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate their fair value because of the short-term nature of these amounts. Cash and Cash Equivalents - For the purpose of reporting cash flows, cash and cash equivalents include cash on hand, amounts due from banks and short-term investments with maturity dates of three months or less at the date of purchase. Contract Assets - Amounts are invoiced as work progresses in accordance with agreed-upon contractual terms, either at periodic intervals or upon achievement of contractual milestones. Generally, revenue recognition occurs before billing, resulting in contract assets. These contract assets are referred to as unbilled receivables and are reported within receivables, net on our consolidated balance sheet. Billed Receivables - Amounts billed and due from our customers are classified as billed receivables and are reported within receivables, net on the consolidated balance sheet. The portion of the payments retained by the customer until final contract settlement is not considered a significant financing component because the intent is to protect the customer. Goodwill - The purchase price of an acquired business is allocated to the tangible assets, financial assets and separately recognized intangible assets acquired less liabilities assumed based upon their respective fair values, with the excess recorded as goodwill. We review goodwill at least annually for impairment, or whenever events or circumstances indicate that the carrying value of long-lived assets may not be fully recoverable. We have elected to perform this annual review as of October 31st of each calendar year. In reviewing goodwill for impairment, we have the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the estimated fair value of a reporting unit is less than its carrying amount. If we elect to perform a qualitative assessment and determine that it is more likely than not that the fair value of the reporting unit is less than its carry amount, then we will perform the quantitative impairment test (described below). We also may bypass the qualitative assessment for any reporting unit in any period and, proceed directly to perform the quantitative impairment test. 36 The quantitative goodwill impairment test, is used to identify both the existence of impairment and the amount of the impairment loss, compares the fair value of a reporting unit with its carrying amount, including goodwill. If the fair value of a If the carrying amount of a reporting unit exceeds its carrying amount, the goodwill of the reporting unit is not impaired. reporting unit exceeds its fair value, an impairment loss will be recognized in the amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. The fair values of the reporting units are determined based on a weighting of the income approach, market approach and market transaction approach. The income approach is a valuation technique in which fair value is based from forecasted future cash flow discounted at the appropriate rate of return commensurate with the risk as well as current rates of return for equity and debt capital as of the valuation date. The forecast used in our estimation of fair value was developed by management based on a contract basis, incorporating adjustments to reflect known contract and market considerations (such as reductions and uncertainty in government spending, pricing pressure and opportunities). The discount rate utilizes a risk adjusted weighted average cost of capital. The market approach is a valuation technique in which the fair value is calculated based on market prices realized in an actual arm's length transaction. The technique consists of undertaking a detailed market analysis of publicly traded companies that provides a reasonable basis for comparison to us. Valuation ratios, which relate market prices to selected financial statistics derived from comparable companies, are selected and applied to us after consideration of adjustments for financial position, growth, market, profitability and other factors. The market transaction approach is a valuation technique in which the fair value is calculated based on market prices realized in actual arm's length transactions. The technique consists of undertaking a detailed market analysis of merged and acquired companies that provides a reasonable basis for comparison to us. Valuation ratios, which relate market prices to selected financial statistics derived from comparable companies, are selected and applied to us after consideration of adjustments for financial position, growth, market, profitability and other factors. To assess the reasonableness of the calculated reporting unit fair values, we compare the sum of the reporting units' fair values to our market capitalization (per share stock price times the number of shares outstanding) and calculate an implied control premium (the excess of the sum of the reporting units' fair values over the market capitalization) and then assess the reasonableness of our implied control premium. Other Intangible Assets - Contract rights and other intangible assets are amortized primarily using the pattern of benefits method over periods ranging from 1 year to 25 years. We account for the cost of computer software developed or obtained for internal use in accordance with Accounting Standards Codification (ASC) 350-985, Intangibles - Goodwill and Other - Software. These capitalized software costs are included in other intangible assets, net. We account for software development costs related to software products for sale, lease or otherwise marketed in accordance with ASC 985-20, Software - Costs of Software to Be Sold, Leased, or Marketed. For projects fully funded by us, development costs are capitalized from the point of demonstrated technological feasibility until the point in time that the product is available for general release to customers. Once the product is available for general release, capitalized costs are amortized based on units sold or on a straight-line basis over a period of 5 years or other such shorter period as may be required. Leases - We adopted ASC 842, Leases, on January 1, 2019. We elected to apply the provisions of the standard as of the date of adoption, and, therefore, have not restated prior comparative periods. Upon adoption, we recorded operating lease obligations of $129.6 million and operating lease right of use (ROU) assets of $118.7 million. We elected the practical expedient to recognize the lease payments related to short-term leases as profit or loss on a straight-line basis over the lease term and variable lease payments in the period in which the obligation for those payments are incurred. We also elected the following transition related practical expedients: not to reassess whether expired or existing contracts are or contain leases, not to reassess lease classification as determined under ASC 840 and not to reassess initial direct costs from any existing lease. We elected the practical expedient as an accounting election not to separate nonlease components from lease components on all classes of underlying assets. Our leases include nonlease components such as common area maintenance, utilities and operating expenses. Additionally, we implemented internal controls and key system functionality to enable the preparation of financial information upon adoption. ASC 842 had a material impact on our consolidated balance sheet, but did not have an impact on our consolidated income statement. The most significant impact was the recognition of ROU assets and lease obligations for operating leases, while our accounting for finance leases remained substantially unchanged. We determine whether a contract is or contains a lease at inception. A contract is or contains a lease if the contract conveys the right to control the use of identified property or equipment (an identified asset) for a period of time in exchange for consideration. We have the right to control the use of the identified asset when we have both of the following: the right to obtain substantially all of the economic benefits from use of the identified asset and the right to direct the use of the identified 37 asset. In making this determination, we consider all relevant facts and circumstances. We reassess whether a contract is or contains a lease only if the terms and conditions of the contract are changed. We account for lease components and nonlease components associated with a lease as a single lease component. Operating leases are included in Operating lease right of use assets, Operating lease obligations—current and Operating lease obligations—long term on our consolidated balance sheets. Finance leases are included in Property and equipment—net, Accrued expenses and other current liabilities and Other long-term liabilities on our consolidated balance sheets. Our ROU asset is recognized as the lease obligation, any initial direct costs and any prepaid lease payments, less any lease incentives. Our lease obligations are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. Our lease payments consist of amounts relating to the use of the underlying asset during the lease term, specifically fixed payments, payments to be made in optional periods when we are reasonably certain to exercise an option to extend the lease or not to exercise an option to terminate the lease and the amounts probable of being owed by us under residual guarantees. Our variable lease payments are excluded in measuring ROU assets and lease obligations because they do not depend on an index or a rate or are not in substance fixed payments. We exclude lease incentives and initial direct costs incurred from our lease payments. Our leases typically do not provide an implicit rate, we use our incremental borrowing rate based on the information available at the commencement date in determining the present value of future payments. For operating leases, after lease commencement, we measure our lease obligation for each period at the present value of any remaining lease payments, discounted by using the rate determined at lease commencement. In our consolidated statement of income, we recognize a single operating lease expense calculated on a straight-line basis over the remaining lease term. The depreciation of the ROU asset increases each year as a result of the declining lease obligation balance. Variable lease payments are not recognized in the measurement of the lease obligation; they are recognized in the period in which the related obligation has been incurred. For finance leases, after lease commencement, we measure our lease obligation by using the effective interest rate method. In each period, the lease obligation will be increased to reflect the interest that is accrued on the related lease obligation by using the appropriate discount rate, offset by a decrease in the lease obligation resulting from the periodic lease payments. We recognize the ROU asset at cost, reduced by any accumulated depreciation. The ROU asset is depreciated on a straight-line basis. Together, the interest expense and depreciation expense result in a front-loaded expense profile. We will present interest expense and depreciation expense separately on our consolidated statements of income. In our consolidated statements of income, we recognize lease expense within general and administrative expense or cost of goods sold depending on the use of the underlying lease. For leases classified as financing, the interest on lease obligations is classified within interest expense. Property and Equipment - Property and equipment are recorded at original cost to us. Upon sale or retirement, the costs and related accumulated depreciation or amortization are eliminated from the respective accounts and any resulting gain or loss is included in income. Maintenance and repairs are charged to expense as incurred. Employee Supplemental Savings Plan Assets - We maintain several non-qualified defined contribution supplemental retirement plans for certain key employees that are accounted for in accordance with ASC 710-10-05, Compensation - General - Deferred Compensation - Rabbi Trust, as the underlying assets are held in rabbi trusts with investments directed by the respective employee. A rabbi trust is a grantor trust generally set up to fund compensation for a select group of management and the assets of this trust are available to satisfy the claims of general creditors in the event of bankruptcy of us. The assets held by the rabbi trusts are recorded at cash surrender value in our consolidated financial statements as Employee supplemental savings plan assets with a related liability to employees recorded as a deferred compensation liability in accrued retirement. Investments - Investments where we have the ability to exercise significant influence, but we do not control, are accounted for under the equity method of accounting and are included in Other assets on our consolidated balance sheets. Significant influence typically exists if we have a 20% to 50% ownership interest in the investee. Under this method of accounting, our share of the net earnings (losses) of the investee is included in Equity in earnings (losses) of unconsolidated subsidiaries on our consolidated statement of income. Investments where we have less than 20% ownership interest in the investee and lack the ability to exercise significant influence are accounted for under ASC 321-10-35, Investments - Equity Securities. Under this topic, our investment equals our cost, less impairment, if any. For investments without a readily determinable fair value, we perform a qualitative assessment to determine if any impairment indicator is present. If an indicator is present, we estimate the fair value to determine if the fair value was less than its carrying value. If the fair value is less than its carrying value or if there is an observable price change through a similar security from the same issuer, we would record an impairment. 38 Deferred Contract Costs - Costs of obtaining or fulfilling a contract that meet the criteria in ASC 340, Other Assets and Deferred Costs, are capitalized and amortized on a systematic basis that is consistent with the transfer of goods or services to the customer. Deferred contract costs are reported on our consolidated balance sheets within current or non-current other assets based on the expected life of the related contract. At December 31, 2020 and 2019, we had $6.6 million and $9.4 million, respectively, of deferred contract costs related to the fulfillment of future contract obligations. For the year ended December 31, 2020 and 2019, we recorded amortization expense of $2.8 million and $2.5 million, respectively. Impairment of Long-Lived Assets - Whenever events or changes in circumstances indicate that the carrying amount of long-lived assets may not be fully recoverable, we evaluate the probability that future undiscounted net cash flows will be less than the carrying amount of the assets. If any impairment were indicated as a result of this review, we would recognize a loss based on the amount by which the carrying amount exceeds the estimated fair value. Contract Liabilities - We receive advances and milestone payments from our customers on selected contracts that exceed revenue earned to date, resulting in contract liabilities. Contract liabilities typically are not considered a significant financing component because it is used to meet working capital demands that can be higher in the early stages of a contract and to protect us from the customer failing to adequately complete some or all of its obligations under the contract. Contract liabilities are reported on our consolidated balance sheet on a net contract basis at the end of each reporting period. Revenue Recognition - We account for a contract when: both we and the customer approve and commit; our rights and those of the customer are identified, payment terms are identified; the contract has commercial substance; and collectability of consideration is probable. At contract inception, we identify the distinct goods or services promised in the contract, referred to as performance obligations. Then we determine the transaction price for the contract; the consideration to which we can expect in exchange for the promised goods or services in the contract. The transaction price can be a fixed or variable amount. It is common for our contracts to contain award fees, incentive fees or other provisions that can either increase or decrease the transaction price. These variable amounts generally are awarded upon achievement of certain performance metrics, program milestones or cost targets and can be based upon customer discretion. We estimate variable consideration at the most likely amount to which we expect to be entitled. We include estimated amounts in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Our estimates of variable consideration and determination of whether to include estimated amounts in the transaction price are based largely on an assessment of our anticipated performance and historical, current and forecasted information that is reasonably available to us. The transaction price is allocated to each distinct performance obligation using our best estimate of the standalone selling price for each distinct good or service promised in the contract. The primary method used to estimate standalone selling price is the expected cost plus a margin approach, under which we forecast our expected costs of satisfying a performance obligation and then add an appropriate margin for that distinct good or service promised. Revenue is recognized when, or as, the performance obligation is satisfied. We recognize revenue over time when there is a continuous transfer of control to our customer. For our U.S. government contracts, this continuous transfer of control to the customer is supported by clauses in the contract that allow the U.S. government to unilaterally terminate the contract for convenience, pay us for costs incurred plus a reasonable profit and take control of any work in process. When control is transferred over time, revenue is recognized based on the extent of progress towards completion of the performance obligation. Based on the nature of the products and services provided in the contract, we use our judgment to determine if an input measure or output measure best depicts the transfer of control over time. For services contracts, we typically satisfy our performance obligations as services are rendered. We typically use a cost-based input method to measure progress. Contract costs include labor, material and allocable indirect expenses. Revenue is recognized proportionally as contract costs are incurred plus estimated fees. For time-and-material contracts, we bill the customer per labor hour and per material, and revenue is recognized in the amount invoiced since the amount corresponds directly to the value of our performance to date. For stand-ready service contracts, a time-elapsed output method is used to measure progress, and revenue is recognized straight-line over the term of the contract. If a contract does not meet the criteria for recognizing revenue over time, we recognize revenue at a point in time. Revenue is recognized at the point in time when control of the good or service is transferred to our customer. We consider control to transfer when we have a present right to payment and our customer has legal title. Determining a measure of progress and when control transfers requires us to make judgments that affect the timing of when revenue is recognized. Essentially all of our contracts satisfy their performance obligations over time. Contracts are often modified to account for changes in contract specifications and requirements. Contract modifications impact the contract when the modification either creates a new performance obligation or changes the existing enforceable rights and obligations. The effect of a contract modification on the transaction price and our measure of progress for the performance obligation to which it relates is recognized as a cumulative adjustment to revenue and profit. Furthermore, a 39 significant change in one or more estimates could affect the profitability of our contracts. We recognize adjustments in estimated profit on contracts in the period identified. The impact of adjustments in contract estimates can be reflected in either revenue or operating expenses on our consolidated statement of income. We have an Estimate at Completion process in which management reviews the progress and execution of our performance obligations. As part of this process, management reviews information including, but not limited to, any outstanding key contract matters, progress towards completion and the related program schedule, identified risks and opportunities and the related changes in estimates of revenue and costs. The risks and opportunities include management’s judgment about the ability and cost to achieve the contract milestones and other technical contract requirements. Management must make assumptions and estimates regarding labor productivity and availability, the complexity of the work to be performed, the availability of materials, the length of time to complete the performance obligation, execution by our subcontractors, the availability and timing of funding from our customer and overhead cost rates, among other variables. A significant change in one or more of these estimates could affect the profitability of our contracts. For the year ended December 31, 2020, the aggregate impact of adjustments in contract estimates increased our revenue by $10.8 million. No adjustment on any one contract was material to our consolidated financial statements for the year ended December 31, 2020. Contract Costs - Contract costs include direct labor, direct materials, overhead and, when applicable, general and administrative expenses. Incremental costs of obtaining a contract that we expect to recover are recognized as deferred contract costs and are amortized on a systematic basis that is consistent with the transfer to the customer of the goods or services. Other incremental costs are expensed when incurred. Costs of fulfilling a contract that relate directly to a contract or to an anticipated contract that can be specifically identified, generate or enhance resources that will be used in satisfying future performance obligations and are expected to be recovered, are recognized as deferred contract costs and amortized on a systematic basis that is consistent with the transfer of the goods or services to the customer. Other costs of fulfilling a contract (costs of wasted materials, labor or other resources to fulfill the contracts that were not reflected in the price of the contract and costs that relate to satisfied performance obligations in the contract) are expensed when incurred. General and Administrative Expenses - General and administrative expenses include the salaries and wages, plus associated fringe benefits of our employees not performing work directly for customers, and associated facilities costs. Among the functions covered by these costs are corporate business development, bid and proposal, contracts administration, finance and accounting, legal, corporate governance and executive and senior management. In addition, we include stock-based compensation, as well as depreciation and amortization expenses related to the general and administrative function. We recognize interest related to unrecognized tax benefits within interest expense and penalties related to unrecognized tax benefits in general and administrative expenses. We classify indirect costs incurred as cost of services and general and administrative expenses in the same manner as such costs are defined in our disclosure statements under U.S. Government Cost Accounting Standards. Depreciation and Amortization Method - Furniture and office equipment are depreciated using the straight-line method with estimated useful lives ranging from one year to seven years. Leasehold improvements are amortized using the straight-line method over the shorter of the asset's useful life or the term of the lease. Stock-based Compensation - We account for stock-based compensation in accordance with ASC 718, Compensation - Stock Compensation, which requires the use of a valuation model to calculate the fair value of stock-based awards. We have elected to use the Black-Scholes-Merton pricing model to determine fair value of stock options on the dates of grant for our stock options. The fair value of stock options is recognized as operating expenses or is capitalized, as appropriate, straight-line over the period in which service is provided in exchange for the award. The grant date fair value of the restricted stock is equal to the closing market price of our common stock on the date of grant. The compensation expense for restricted stock is recognized over the service period and is based on the grant date fair value of the shares. The grant date fair value of the restricted stock unit (RSU) is equal to the closing market price of our common stock on the grant date less the present value of dividends expected to be awarded during the service period. We recognize the grant date fair value of RSUs of shares we expect to issue as compensation expense ratably over the requisite service period. We account for forfeitures as they occur. Income Taxes - We account for income taxes in accordance with ASC 740, Income Taxes. Under this method, deferred income taxes are determined based on the estimated future tax effects of differences between the financial statement and tax bases of assets and liabilities given the provisions of enacted tax laws. Deferred income tax provisions and benefits are based on changes to the assets or liabilities from year-to-year. In providing for deferred taxes, we consider tax regulations of the jurisdictions in which we operate, estimates of future taxable income and available tax planning strategies. If tax regulations, operating results or the ability to implement tax-planning strategies vary, adjustments to the carrying value of deferred tax assets and liabilities may be required. Valuation allowances are recorded related to deferred tax assets based on the “more 40 likely than not” criteria. We recognize the financial statement benefit of a tax position only after determining that the relevant tax authority would “more likely than not” sustain the position following an audit. For tax positions meeting the “more likely than not” threshold, the amount recognized in the financial statements is the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant tax authority. Foreign-Currency Translation - All assets and liabilities of foreign subsidiaries are translated into U.S. dollars at fiscal year-end exchange rates. Income and expense items are translated at average monthly exchange rates prevailing during the fiscal year. The resulting translation adjustments are recorded as a component of accumulated other comprehensive income (loss). Comprehensive Income (Loss) - Comprehensive income (loss) consists of net income; translation adjustments, net of tax; and actuarial gain (loss) on defined benefit pension plan, net of tax. Recently Adopted ASUs ASUs adopted during the year ended December 31, 2020 did not have a material impact on our consolidated financial statements. Recently Issued But Not Yet Adopted ASUs ASUs effective after December 31, 2020 are not expected to have a material effect on our consolidated financial statements. 3. Revenue from Contracts with Customers We derive revenue from contracts with customers primarily from contracts with the U.S. government in the areas of defense, intelligence, homeland security and other federal civilian agencies. Substantially all of our revenue is derived from services and solutions provided to the U.S. government or to prime contractors supporting the U.S. government, including services by our employees and our subcontractors, and solutions that include third-party hardware and software that we purchase and integrate as a part of our overall solutions. Customer requirements may vary from period-to-period depending on the contract. We provide our services and solutions under three types of contracts: cost-reimbursable, fixed-price and time-and- materials. Under cost-reimbursable contracts, we are reimbursed for costs that are determined to be reasonable, allowable and allocable to the contract and paid a fee representing the profit margin negotiated between us and the contracting agency, which may be fixed or performance based. Under fixed-price contracts, we perform specific tasks for a fixed price. Fixed-price contracts may include either a product delivery or specific service performance over a defined period. Under time-and- materials contracts, we are reimbursed for labor at fixed hourly rates and generally reimbursed separately for allowable materials, costs and expenses at cost. We have one reportable segment. Our U.S. government customers typically exercise independent decision-making and contracting authority. Offices or divisions within an agency or department of the U.S. government may directly, or through a prime contractor, use our services as a separate customer as long as the customer has independent decision-making and contracting authority within its organization. We treat sales to U.S. government customers as sales within the U.S. regardless of where the services are performed. We generated 99%, 99% and 98% from revenue generated in the U.S. for the years ended December 31, 2020, 2019 and 2018, respectively. The following tables disclose revenue (in thousands) by contract type, customer and prime or subcontractor for the periods presented. Cost-reimbursable Fixed-price Time-and-materials Year Ended December 31, 2020 2019 2018 $ 1,724,056 $ 1,541,687 $ 1,325,024 485,847 308,481 451,312 229,560 435,599 197,934 $ 2,518,384 $ 2,222,559 $ 1,958,557 41 U.S. Government State agencies, international agencies and commercial entities Prime contractor Subcontractor Year Ended December 31, 2020 2019 2018 $ 2,476,655 $ 2,175,734 $ 1,913,461 41,729 46,825 45,096 $ 2,518,384 $ 2,222,559 $ 1,958,557 Year Ended December 31, 2020 2019 2018 $ 2,297,452 $ 1,995,471 $ 1,742,097 220,932 227,088 216,460 $ 2,518,384 $ 2,222,559 $ 1,958,557 We deliver a broad array of IT and technical services solutions under contracts with the U.S. government, state and local governments and commercial customers. The components of receivables are as follows (in thousands): Billed receivables Unbilled receivables Allowance for doubtful accounts Receivables-net December 31, 2020 December 31, 2019 $ $ 312,991 $ 106,007 (18,377) 400,621 $ 311,061 99,493 (11,578) 398,976 Receivables at December 31, 2020 are expected to be substantially collected within one year except for approximately $1.9 million, of which a majority is related to U.S. government receivables. We do not believe that we have significant exposure to credit risk as billed receivable and unbilled receivables are primarily due from the U.S. government. The allowance for doubtful accounts represents our estimate for exposure to compliance, contractual issues and bad debts related to prime contractors. We measure future expected credit losses expected to occur over the estimated life or remaining contractual life of an asset (which includes losses that may be incurred in future periods). When we identify receivables with unique risk characteristics, we evaluate such receivables on an individual basis. A change in our assessment of the creditworthiness of a prime contractor on one of our contracts resulted in an increase in allowance for doubtful accounts during 2020. The following table discloses contract liabilities (in thousands): Contract liabilities December 31, 2020 December 31, 2019 $ 37,218 $ 27,620 Changes in the balance of contract liabilities are primarily due to the timing difference between our performance and our customers' payments. For the year ended December 31, 2020, the amount of revenue that was included in the opening contract liabilities balance was $22.5 million. The remaining performance obligation at December 31, 2020 was $2.8 billion. The following table discloses when we expect to recognize the remaining performance obligation as revenue (in billions): December 31, 2021 December 31, 2022 Thereafter For the year ending $ 4. Leases 2.0 $ 0.3 $ 0.5 We elected to adopt ASC 842 using the modified retrospective method at the beginning of the period of adoption, January 1, 2019, through the recognition of a lease obligation and corresponding right of use asset. We elected the following transition related practical expedients: not to reassess whether any expired or existing contracts are or contain leases, not to reassess lease classification as determined under ASC 840, Leases, and, not to reassess initial direct costs for any existing lease. We have also 42 elected not to apply the recognition and measurement requirements to short-term leases (less than 1 year). Prior to the adoption of ASC 842, we accounted for leases under the requirements of ASC 840. Office space and equipment rent expense totaled approximately $39.9 million for the year ended December 31, 2018. The amounts for years prior to the adoption on January 1, 2019 have not been adjusted under the modified retrospective method. Our operating leases are primarily made up of real estate. Our variable lease payments do not depend on an index or a rate or are not in substance fixed payments. Our leases have remaining lease terms of 1 month to 10 years, some of which include options to extend the leases for up to 14 years, and some of which include options to terminate the leases within 1 year. Our transportation vehicles and equipment leases include a residual value guarantee, which is a guarantee made to the lessor that the value of the underlying asset returned to the lessor at the end of the lease will be at least a specific amount. We sublease some of our real estate space. Sublease income is immaterial and is presented net with the corresponding lease expense. We recognize payments related to short-term leases (less than one year) as expense on a straight-line basis over the lease term and variable lease payments in the period in which the obligation for those payments were incurred. As such, our short-term lease expense for the year ended December 31, 2020 and 2019 was $6.3 million and $5.4 million, respectively. For the year ended December 31, 2020 and 2019, we incurred variable lease costs of $2.7 million and $2.4 million, respectively. The balance sheet information related to our leases was as follows (dollars in thousands): Operating Leases Operating lease right of use assets Operating lease obligations—current Operating lease obligations—long term Finance Leases Property and equipment—gross Accumulated depreciation Property and equipment—net Accrued expenses and other current liabilities Other long-term liabilities The components of lease expense were as follows (in thousands): Operating lease expenses Finance Leases Depreciation of right of use assets Interest on lease liabilities December 31, 2020 December 31, 2019 94,825 $ 117,728 30,105 $ 80,242 $ 29,047 103,148 705 $ (330) 375 $ 178 $ 227 $ 641 (206) 435 142 297 For the year ended December 31, 2020 2019 33,873 $ 33,622 168 $ 36 $ 147 44 $ $ $ $ $ $ $ $ $ $ 43 The weighted average information related to leases was as follows: Weighted Average Remaining Lease Term Operating leases Finance leases Weighted Average Discount Rate Operating leases Finance leases December 31, 2020 December 31, 2019 4 years 3 years 4 % 4 % 5 years 3 years 3 % 5 % Future minimum lease payments under non-cancellable leases as of December 31, 2020 were as follows (in thousands): For the year ended: December 31, 2021 December 31, 2022 December 31, 2023 December 31, 2024 December 31, 2025 Thereafter Total future minimum lease payments Less imputed interest Total 5. Acquisitions Operating Leases Financing Leases $ 33,220 $ 32,731 27,090 14,174 4,063 7,033 118,311 (7,964) $ 110,347 $ 182 176 61 11 12 1 443 (38) 405 Tapestry Technologies (Tapestry)—On December 11, 2020, we completed the acquisition of Tapestry through a share purchase agreement by and among ManTech International Corporation, Tapestry Technologies, Inc., Project Tribune Holdings, Inc. (Holdco), and all of the shareholders of the Holdco. Tapestry provides unique insight and cybersecurity solutions to the U.S. Defense Information Systems Agency (DISA) and the Department of Defense (DoD). This acquisition broadens our footprint with DISA, serves as a springboard into the broader Defense Department IT marketspace, and provides us access to well-funded DISA and DoD programs. The acquisition was accounted for as a business combination. The results of Tapestry's operations have been included in our consolidated financial statements since that date. We funded the acquisition with cash on hand and borrowing under our revolving credit facility. The preliminary purchase price was $46.3 million and it includes an estimated working capital adjustment. The preliminary purchase price was preliminarily allocated to the underlying assets and liabilities based on their estimated fair value at the date of acquisition. The excess of the purchase price over the fair value of assets acquired and liabilities assumed was recorded as goodwill. As we are still in the process of reviewing the fair value of the assets acquired and liabilities assumed, the purchase price allocation for Tapestry is not complete as of December 31, 2020. In accordance with ASC 805, Business Combinations, we expect to finalize our purchase price allocation within one year of the acquisition date. Recognition of goodwill is largely attributed to the value paid for Tapestry's capabilities, which will broaden our footprint within DISA and the Defense Department IT marketplace. The goodwill recorded for this transaction will be deductible for tax purposes over 15 years. The components of other intangible assets associated with the acquisition were customer relationships and backlog valued at $15.1 million and $1.4 million, respectively. The fair values of the customer relationships and backlog were determined using the excess earnings method (income approach) in which the value is derived from an estimation of the after-tax cash flows specifically attributable to backlog and customer relationships. Assumptions used in the analysis included revenue and expense forecasts, contributory asset charges, tax amortization benefit and discount rates. Customer contracts and related relationships represent the underlying relationships and agreements with Tapestry's existing customers. Customer relationships are amortized using the pattern of benefits method over their estimated useful lives of approximately 20 years. 44 Backlog is amortized using the pattern of benefits method over its estimated useful life of 2 years. The weighted-average amortization period of other intangibles is 18 years. The following table represents the preliminary purchase price allocation for Tapestry (in thousands): Cash and cash equivalents Receivables Prepaid expenses Goodwill Other intangible assets Property and equipment Operating lease right of use assets Other assets Accounts payable Accrued salaries and related expenses Operating lease obligations—current Operating lease obligations—long term Net assets acquired and liabilities assumed $ $ 37 3,614 225 27,196 16,500 269 934 10 (483) (1,142) (457) (453) 46,250 For the year ended December 31, 2020, we incurred approximately $0.1 million of acquisition costs related to the Tapestry transaction, which are included in general and administrative expenses in our consolidated statement of income. Minerva Engineering (Minerva)—On November 9, 2020, we completed the acquisition of Minerva through a membership interest purchase agreement by and among ManTech International Corporation., Minerva Engineering, LLC and NH Holdco LLC. Minerva is a leading provider of advanced cyber services that support the intelligence community, including risk and vulnerability assessment, incident response and cyber intrusion detection, and wireless signal discovery. This acquisition enhances and expands our cyber defense capabilities within the intelligence community, adding new customers, new past performance qualifications, mission-critical contracts, and highly skilled, cleared professionals that increase our deep cyber security talent base. The acquisition was accounted for as a business combination. The results of Minerva's operations have been included in our consolidated financial statements since that date. We paid for the acquisition with cash on November 9, 2020 and a short- term promissory note that was paid on November 12, 2020. The preliminary purchase price was $32.6 million and it includes an estimated working capital adjustment. The preliminary purchase price was preliminarily allocated to the underlying assets and liabilities based on their estimated fair value at the date of acquisition. The excess of the purchase price over the fair value of assets acquired and liabilities assumed was recorded as goodwill. As we are still in the process of reviewing the fair value of the assets acquired and liabilities assumed, the purchase price allocation for Minerva is not complete as of December 31, 2020. In accordance with ASC 805, Business Combinations, we expect to finalize our purchase price allocation within one year of the acquisition date. Recognition of goodwill is largely attributed to the value paid for Minerva's capabilities, which will broaden our footprint within the intelligence community through the addition of differentiated capabilities and access to new customers and contracts. The goodwill recorded for this transaction will be deductible for tax purposes over 15 years. The components of other intangible assets associated with the acquisition were customer relationships and backlog valued at $10.5 million and $1.1 million, respectively. The fair values of the customer relationships and backlog were determined using the excess earnings method (income approach) in which the value is derived from an estimation of the after-tax cash flows specifically attributable to backlog and customer relationships. Assumptions used in the analysis included revenue and expense forecasts, contributory asset charges, tax amortization benefit and discount rates. Customer contracts and related relationships represent the underlying relationships and agreements with Minerva's existing customers. Customer relationships are amortized using the pattern of benefits method over their estimated useful lives of approximately 20 years. Backlog is amortized using the pattern of benefits method over its estimated useful life of 2 years. The weighted-average amortization period for other intangible assets is 18 years. 45 The following table represents the preliminary purchase price allocation for Minerva (in thousands): Cash and cash equivalents Receivables Prepaid expenses Goodwill Other intangible assets Property and equipment Operating lease right of use assets Other assets Accounts payable Accrued salaries and related expenses Contract liabilities Operating lease obligations—current Accrued expenses and other current liabilities Operating lease obligations—long term Net assets acquired and liabilities assumed $ 56 4,573 25 19,428 11,600 148 968 29 (1,870) (847) (449) (384) (141) (562) $ 32,574 For the year ended December 31, 2020, we incurred approximately $0.4 million of acquisition costs related to the Minerva transaction, which are included in general and administrative expenses in our consolidated statement of income. H2M Group (H2M)—On August 8, 2019, we completed the acquisition of H2M through a membership interest purchase agreement by and among H2M Group, HHM Holding LLC, and the Members and ManTech International Corporation. H2M is a provider of intelligence and analysis services and solutions primarily to the National Geospatial-Intelligence Agency (NGA). This acquisition strengthens our ability to help key government agencies implement new automation techniques that enable intelligence analysts to more efficiently navigate large amounts of data and distill critical information to inform actionable intelligence and make mission-critical decisions. The acquisition was accounted for as a business combination. The results of H2M's operations have been included in our consolidated financial statements since that date. We funded the acquisition with cash on hand and borrowings on our revolving credit facility. The purchase price of $38.5 million, which includes the finalized working capital adjustment, was allocated to the underlying assets and liabilities based on their estimated fair value at the date of acquisition. The excess of the purchase price over the fair value of assets acquired and liabilities assumed was recorded as goodwill. The purchase price allocation for H2M is complete as of December 31, 2020. Determining the fair value of assets acquired and liabilities assumed requires significant judgment, which includes, among other factors, analysis of historical performance and estimates of future performance of H2M's contracts. In some cases, we have used discounted cash flow analyses, which were based on our best estimate of future revenue, earnings and cash flows as well as our discount rate adjusted for risk. Recognition of goodwill is largely attributed to the value paid for H2M's capabilities to support government agencies in the implementation of high-quality geospatial and professional services. The goodwill recorded for this transaction will be deductible for tax purposes over 15 years. The components of other intangible assets associated with the acquisition were customer relationships and backlog valued at $9.6 million and $2.3 million, respectively. The fair values of the customer relationships and backlog were determined using the excess earnings method (income approach) in which the value is derived from an estimation of the after-tax cash flows specifically attributable to backlog and customer relationships. Assumptions used in the analysis included revenue and expense forecasts, contributory asset charges, tax amortization benefit and discount rates. Customer contracts and related relationships represent the underlying relationships and agreements with H2M's existing customers. Customer relationships are amortized using the pattern of benefits method over their estimated useful lives of approximately 20 years. Backlog is amortized using the pattern of benefits method over its estimated useful life of 2 years. The weighted-average amortization period for other intangible assets is 17 years. 46 The following table represents the finalized purchase price allocation for H2M (in thousands): Cash and cash equivalents Receivables Prepaid expenses Other current assets Goodwill Other intangible assets Property and equipment Operating lease right of use assets Other assets Accounts payable Accrued salaries and related expenses Operating lease obligations—long term Net assets acquired and liabilities assumed $ $ 29 4,187 188 5 25,089 11,900 56 152 7 (1,956) (1,023) (152) 38,482 For the year ended December 31, 2019, we incurred approximately $0.3 million of acquisition costs related to the H2M transaction, which are included in general and administrative expenses in our consolidated statement of income. Kforce Government Solutions (KGS)—On April 1, 2019, we completed the acquisition of KGS. KGS was a wholly owned subsidiary of the publicly traded commercial technology and staffing company KForce, Inc. The acquisition was completed through an equity purchase agreement dated February 28, 2019, by and among Kforce Government Solutions, Inc and other beneficiaries and ManTech International Corporation. KGS provides services, IT solutions, transformation and management consulting and data analytics - most notably in the healthcare IT market. This acquisition expands our presence with important customers such as the Department of Veteran Affairs (VA). The acquisition was accounted for as a business combination. The results of KGS's operations have been included in our consolidated financial statements since that date. We funded the acquisition with cash on hand and borrowings on our revolving credit facility. The purchase price of $114.6 million, which includes the finalized working capital adjustment, was allocated to the underlying assets and liabilities based on their estimated fair value at the date of acquisition. The excess of the purchase price over the fair value of assets acquired and liabilities assumed was recorded as goodwill. The purchase price allocation of KGS is complete as of December 31, 2019. Determining the fair value of assets acquired and liabilities assumed requires significant judgment, which includes, among other factors, analysis of historical performance and estimates of future performance of KGS’s contracts. In some cases, we have used discounted cash flow analyses, which were based on our best estimate of future revenue, earnings and cash flows as well as our discount rate adjusted for risk. Recognition of goodwill is largely attributed to the value paid for KGS's capabilities to support customers in IT solutions, transformation and management consulting and data analytics. A majority of the goodwill recorded will not be deductible for tax purposes. The components of other intangible assets associated with the acquisition were customer relationships and backlog valued at $33.1 million and $1.6 million, respectively. The fair values of the customer relationships and backlog were determined using the excess earnings method (income approach) in which the value is derived from an estimation of the after-tax cash flows specifically attributable to backlog and customer relationships. Assumptions used in the analysis included revenue and expense forecasts, contributory asset charges, tax amortization benefit and discount rates. Customer contracts and related relationships represent the underlying relationships and agreements with KGS's existing customers. Customer relationships are amortized using the pattern of benefits method over their estimated useful lives of approximately 20 years. Backlog is amortized straight-line over its estimated useful life of 1 year. The weighted-average amortization period for other intangible assets is 19 years. 47 The following table represents the finalized purchase price allocation for KGS (in thousands): Cash and cash equivalents Receivables Prepaid expenses Other current assets Goodwill Other intangible assets Property and equipment Accounts payable Accrued salaries and related expenses Accrued expenses and other current liabilities Deferred income taxes Other long-term liabilities $ 154 17,071 368 168 80,374 34,839 361 (5,035) (4,421) (1,860) (7,087) (379) Net assets acquired and liabilities assumed $ 114,553 For the year ended December 31, 2019, we incurred approximately $0.9 million of acquisition costs related to the KGS transaction, which are included in general and administrative expenses in our consolidated statement of income. 6. Earnings per Share Under ASC 260, Earnings per Share, the two-class method is an earnings allocation formula that determines earnings per share for each class of common stock according to dividends declared (or accumulated) and participation rights in undistributed earnings. Under that method, basic and diluted earnings per share data are presented for each class of common stock. In applying the two-class method, we determined that undistributed earnings should be allocated equally on a per share basis between Class A and Class B common stock. Under our Certificate of Incorporation, the holders of the common stock are entitled to participate ratably, on a share-for-share basis as if all shares of common stock were of a single class, in such dividends, as may be declared by the Board of Directors. During the years ended December 31, 2020, 2019 and 2018, we declared and paid quarterly dividends, in the amount of $0.32, $0.27 and $0.25 per share on both classes of common stock. Basic earnings per share has been computed by dividing net income available to common stockholders by the weighted average number of shares of common stock outstanding during each period. Shares issued during the period and shares reacquired during the period are weighted for the portion of the period in which the shares were outstanding. Diluted earnings per share have been computed in a manner consistent with that of basic earnings per share while giving effect to all potentially dilutive common shares that were outstanding during each period. 48 The net income available to common stockholders and weighted average number of common shares outstanding used to compute basic and diluted earnings per share for each class of common stock are as follows (in thousands, except per share amounts): Distributed earnings Undistributed earnings Net income Class A common stock: Basic net income available to common stockholders Basic weighted average common shares outstanding Basic earnings per share Diluted net income available to common stockholders Effect of potential exercise of stock options Diluted weighted average common shares outstanding Diluted earnings per share Class B common stock: Basic net income available to common stockholders Basic weighted average common shares outstanding Basic earnings per share Diluted net income available to common stockholders Diluted weighted average common shares outstanding Diluted earnings per share Year Ended December 31, 2019 $ $ $ $ $ $ $ $ $ $ 43,207 70,683 113,890 76,294 26,763 2.85 76,555 279 27,042 2020 51,621 68,909 120,530 81,087 27,105 2.99 81,405 328 27,433 2.97 $ 2.83 $ 39,443 13,185 2.99 39,125 13,185 2.97 $ $ $ $ 37,596 13,188 2.85 37,335 13,188 2.83 $ $ $ $ $ $ $ $ $ $ $ $ $ $ 2018 39,627 42,470 82,097 54,715 26,354 2.08 54,937 324 26,678 2.06 27,382 13,189 2.08 27,160 13,189 2.06 For the years ended December 31, 2020, 2019 and 2018, options to purchase 213,248 shares, 288,133 shares and 293,898 shares, respectively, were outstanding but not included in the computation of diluted earnings per share because the options' effect would have been anti-dilutive. For the years ended December 31, 2020, 2019 and 2018, there were 223,405 shares, 338,748 shares and 420,524 shares, respectively, issued from the exercise of stock options. 7. Property and Equipment Major classes of property and equipment are summarized as follows (in thousands): Furniture and equipment Leasehold improvements Finance leases Property and equipment-gross Accumulated depreciation and amortization Property and equipment-net December 31, 2020 2019 $ 194,470 $ 150,640 62,293 705 257,468 (136,172) 49,625 641 200,906 (115,275) $ 121,296 $ 85,631 Depreciation and amortization expense related to property and equipment for the years ended December 31, 2020, 2019 and 2018 was $39.5 million, $27.6 million and $25.5 million, respectively. 49 8. Goodwill and Other Intangible Assets The changes in the carrying amounts of goodwill during fiscal years 2020 and 2019 were as follows (in thousands): Goodwill at December 31, 2018 Acquisitions Goodwill at December 31, 2019 Acquisitions Acquisition fair value adjustment Goodwill at December 31, 2020 Goodwill Balance $ 1,085,806 105,453 1,191,259 46,624 11 $ 1,237,894 Other intangible assets consisted of the following (in thousands): December 31, 2020 December 31, 2019 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Other intangible assets: Contract and program intangible assets Capitalized software Total other intangible assets-net $ $ 430,632 54,605 $ 242,194 40,812 $ 188,438 13,793 $ 402,532 52,411 $ 221,437 36,728 $ 181,095 15,683 485,237 $ 283,006 $ 202,231 $ 454,943 $ 258,165 $ 196,778 Amortization expense relating to intangible assets for the years ended December 31, 2020, 2019 and 2018 was $27.6 million, $25.4 million and $26.3 million, respectively. Amortization expense for the year ended December 31, 2020 includes an impairment of $1.4 million for capitalized software. We estimate that we will have the following amortization expense for the future periods indicated below (in thousands): Year ending: December 31, 2021 December 31, 2022 December 31, 2023 December 31, 2024 December 31, 2025 9. Debt $ $ $ $ $ 24,581 24,232 19,612 17,486 15,423 Revolving Credit Facility - We maintain a credit agreement with a syndicate of lenders led by Bank of America, N.A., as sole administrative agent. The credit agreement provides for a $500 million revolving credit facility, with a $75 million letter of credit sublimit and a $30 million swing line loan sublimit. The credit agreement also includes an accordion feature that permits us to arrange with the lenders for the provision of additional commitments. The maturity date is August 17, 2022. Borrowings under our credit agreement are collateralized by substantially all of our assets and our Material Subsidiaries (as defined in the credit agreement) and bear interest at one of the following variable rates as selected by us at the time of borrowing: a LIBOR based rate plus market spreads (1.25% to 2.25% based on our consolidated total leverage ratio) or Bank of America's base rate plus market spreads (0.25% to 1.25% based on our consolidated total leverage ratio). The aggregate annual weighted average interest rates were 2.32% and 4.11% for the years ended December 31, 2020 and 2019, respectively. 50 The terms of the credit agreement permit prepayment and termination of the loan commitments at any time, subject to certain conditions. The credit agreement requires us to comply with specified financial covenants, including the maintenance of certain leverage ratios and a certain consolidated coverage ratio. The credit agreement also contains various covenants, including affirmative covenants with respect to certain reporting requirements and maintaining certain business activities, and negative covenants that, among other things, may limit or impose restrictions on our ability to incur liens, incur additional indebtedness, make investments, make acquisitions and undertake certain other actions. As of, and during the fiscal years ending, December 31, 2020 and 2019, we were in compliance with our financial covenants under the credit agreement. There was $15.0 million and $36.5 million outstanding on our revolving credit facility at December 31, 2020 and 2019, respectively. The weighted average borrowings under the revolving portion of the facility during the years ended December 31, 2020 and 2019 were $37.3 million and $37.0 million, respectively. The maximum available borrowing under the revolving credit facility at December 31, 2020 was $478.8 million. At December 31, 2020 and 2019, we had $6.2 million and $5.8 million, respectively, outstanding on our letter of credit that reduces our availability to borrow under our revolving credit facility. 10. Commitments and Contingencies Contracts with the U.S. government, including subcontracts, are subject to extensive legal and regulatory requirements and, from time-to-time, agencies of the U.S. government, in the ordinary course of business, investigate whether our operations are conducted in accordance with these requirements and the terms of the relevant contracts. U.S. government investigations of us, whether related to our U.S. government contracts or conducted for other reasons, could result in administrative, civil, or criminal liabilities, including repayments, fines or penalties being imposed upon us, or could lead to suspension or debarment from future U.S. government contracting activities. Management believes it has adequately reserved for any losses that may be experienced from any investigation of which it is aware. The Defense Contract Audit Agency has completed our incurred cost audits through 2016 with no material adjustments. The remaining audits for 2017 through 2020 are not expected to have a material effect on our financial position, results of operations or cash flow and management believes it has adequately reserved for any losses. In the normal course of business, we are involved in certain governmental and legal proceedings, claims and disputes and have litigation pending under several suits. We believe that the ultimate resolution of these matters will not have a material effect on our financial position, results of operations or cash flows, except for the matter noted below. We have $6.2 million outstanding on our letter of credit, of which $5.7 million is related to an outstanding performance bond in connection with a contract between ManTech MENA, LLC and Jadwalean International Operations and Management Company to fulfill technical support requirements for the Royal Saudi Air Force. 11. Stockholders' Equity and Stock-Based Compensation Common Stock - We have 150,000,000 shares of authorized Class A common stock, par value $0.01 per share. We have 50,000,000 shares of authorized Class B common stock, par value $0.01 per share. On December 31, 2020, there were 27,294,361 shares of Class A common stock outstanding, 244,113 shares of Class A common stock recorded as treasury stock and 13,176,695 shares of Class B common stock outstanding. Holders of Class A common stock are entitled to one vote for each share held of record and holders of Class B common stock are entitled to ten votes for each share held of record, except with respect to any “going private transaction” (generally, a transaction in which George J. Pedersen (our Chairman Emertius), his affiliates, his direct and indirect permitted transferees or a group, generally including Mr. Pedersen, such affiliates and permitted transferees, seek to buy all outstanding shares), as to which each share of Class A common stock and Class B common stock are entitled to one vote per share. The Class A common stock and the Class B common stock vote together as a single class on all matters submitted to a vote of stockholders, including the election of directors, except as required by law. Holders of common stock do not have cumulative voting rights in the election of directors. Stockholders are entitled to receive, when and if declared by the Board of Directors from time-to-time, such dividends and other distributions in cash, stock or property from our assets or funds legally and contractually available for such purposes subject to any dividend preferences that may be attributable to preferred stock that may be authorized. Each share of Class A common stock and Class B common stock is equal in respect to dividends and other distributions in cash, stock or property, except that in the case of stock dividends, only shares of Class A common stock will be distributed with respect to the Class A common stock and only shares of Class B common stock will be distributed with respect to Class B common stock. In no event will either Class A common stock or Class B common stock be split, divided or combined unless the other class is 51 proportionately split, divided or combined. The shares of Class A common stock are not convertible into any other series or class of securities. Each share of Class B common stock, however, is freely convertible into one share of Class A common stock at the option of the Class B stockholder. Upon the death of Mr. Pedersen, all outstanding shares of Class B common stock automatically convert to Class A common stock. Preferred Stock - We are authorized to issue an aggregate of 20,000,000 shares of preferred stock, $0.01 par value per share, the terms and conditions of which are determined by our Board of Directors upon issuance. The rights, preferences and privileges of holders of our common stock are subject to, and may be adversely affected by, the rights of holders of any shares of preferred stock that we may designate and issue in the future. At December 31, 2020 and 2019, no shares of preferred stock were outstanding and the Board of Directors currently has no plans to issue a series of preferred stock. Accounting for Stock-Based Compensation: Our 2016 Management Incentive Plan (the Plan) was designed to attract, retain and motivate key employees. The types of awards available under the Plan include stock options, restricted stock and RSUs, among others. Equity awards granted under the Plan are settled in shares of Class A common stock. At the beginning of each year, the Plan provides that the number of shares available for issuance automatically increases by an amount equal to 1.5% of the total number of shares of Class A and Class B common stock outstanding on December 31st of the previous year. On January 2, 2021, there were 607,066 additional shares made available for issuance under the Plan. Through December 31, 2020, the Board of Directors has authorized the issuance of up to 15,751,005 shares under this Plan. Through December 31, 2020, the remaining aggregate number of shares of our common stock available for future grants under the Plan was 7,160,951. The Plan expires in March 2026. The Plan is administered by the Compensation Committee of our Board of Directors, along with its delegates. Subject to the express provisions of the Plan, the Committee has the Board of Directors' authority to administer and interpret the Plan, including the discretion to determine the exercise price, vesting schedule, contractual life and the number of shares to be issued. Stock Compensation Expense - For the years ended December 31, 2020, 2019 and 2018, we recorded $11.4 million, $7.5 million and $5.1 million of stock-based compensation expense, respectively. No compensation expense of employees with stock awards was capitalized during the years ended December 31, 2020, 2019 and 2018. For the year ended December 31, 2020, 2019 and 2018 we recorded $1.6 million, $2.1 million and $3.4 million, respectively, to income tax benefit related to the exercise of stock options, vested cancellations and the vesting of restricted stock and restricted stock units. Stock Options - Under the Plan, we have issued stock options. A stock option granted gives the holder the right, but not the obligation to purchase a certain number of shares at a predetermined price for a specific period of time. We typically issue options that vest over 3 years in equal installments beginning on the first anniversary of the date of grant. Under the terms of the Plan, the contractual life of the option grants may not exceed 8 years. During the years ended December 31, 2019 and 2018, we issued options that expire 5 years from the date of grant. There were no options granted during the year ended December 31, 2020. Fair Value Determination - We have used the Black-Scholes-Merton option pricing model to determine fair value of our stock option awards on the date of grant. We will reconsider the use of the Black-Scholes-Merton model if additional information becomes available in the future that indicates another model would be more appropriate or if grants issued in future periods have characteristics that cannot be reasonably estimated under this model. The following weighted-average assumptions were used for option grants during the years ended December 31, 2019 and 2018: • • • Volatility - The expected volatility of the options granted was estimated based upon historical volatility of our share price through weekly observations of our trading history. Expected life of options - The expected life of options granted to employees was determined from historical exercises of the grantee population. The options had graded vesting over 3 years in equal installments beginning on the first anniversary of the date of the grant and a contractual term of 5 years. Risk-free interest rate - The yield on zero-coupon U.S. Treasury strips was used to extrapolate a forward-yield curve. This “term structure” of future interest rates was then input into a numeric model to provide the equivalent risk-free rate to be used in the Black-Scholes-Merton model based on the expected term of the underlying grants. 52 • Dividend yield - The Black-Scholes-Merton valuation model requires an expected dividend yield as an input. For the years ended December 31, 2019 and 2018, we have calculated our expected dividend yield based on an expected annual cash dividend of $1.08 per share and $1.00 per share, respectively. The following table summarizes weighted-average assumptions used in our calculations of fair value for the years ended December 31, 2019 and 2018: Volatility Expected life of options Risk-free interest rate Dividend yield Year Ended December 31, 2019 2018 27.21 % 26.57 % 3 years 3 years 1.98 % 1.76 % 2.72 % 2.00 % Stock Option Activity - There were no options granted during the year ended December 31, 2020. The weighted-average fair value of options granted during the years ended December 31, 2019 and 2018, as determined under the Black-Scholes- Merton valuation model, was $12.07 and $10.42, respectively. Option grants that vested during the years ended December 31, 2020, 2019 and 2018 had a combined fair value of $3.6 million, $2.5 million and $1.5 million, respectively. The following table summarizes stock option activity for the years ended December 31, 2020, 2019 and 2018: Stock options outstanding at December 31, 2017 Granted Exercised Cancelled and expired Stock options outstanding at December 31, 2018 Granted Exercised Cancelled and expired Stock options outstanding at December 31, 2019 Exercised Cancelled and expired Stock options outstanding at December 31, 2020 Stock options exercisable at December 31, 2020 Weighted Average Exercise Price Aggregate Intrinsic Value (in thousands) Weighted Average Remaining Contractual Life Number of Shares 1,169,408 466,828 $ $ (420,524) $ (122,312) $ 1,093,400 489,947 $ $ (338,748) $ (108,504) $ 1,136,095 $ (223,405) $ (126,863) $ 785,827 432,184 $ $ 35.88 54.87 30.05 43.85 45.34 63.87 37.94 51.21 54.98 46.72 61.17 56.33 52.05 $ $ $ $ $ $ $ $ 16,731 12,411 8,776 9,641 28,291 6,897 25,629 3 years 15,944 2 years The following table summarizes non-vested stock options for the year ended December 31, 2020: Non-vested stock options at December 31, 2019 Vested Cancelled Non-vested stock options at December 31, 2020 53 Number of Shares Weighted Average Fair Value 845,555 $ (368,592) $ (123,320) $ 353,643 $ 10.88 9.88 11.63 11.66 Unrecognized compensation expense related to outstanding stock options was $3.0 million as of December 31, 2020, which is expected to be recognized over a weighted-average period of one year and will be adjusted for forfeitures as they occur. Restricted Stock - Under the Plan, we have issued restricted stock. A restricted stock award is an issuance of shares that cannot be sold or transferred by the recipient until the vesting period lapses. Restricted stock issued to members of our Board of Directors vest in one year. The related compensation expense is recognized over the service period and is based on the grant date fair value of the stock and the number of shares expected to vest. The grant date fair value of the restricted stock is equal to the closing market price of our common stock on the date of grant. Restricted Stock Activity - The following table summarizes the restricted stock activity during the years ended December 31, 2020 and 2019: Non-vested restricted stock at December 31, 2018 Granted Vested Non-vested restricted stock at December 31, 2019 Granted Vested Non-vested restricted stock at December 31, 2020 Number of Shares Weighted Average Fair Value 20,000 24,000 $ $ (20,000) $ $ 24,000 24,000 $ (24,000) $ 24,000 $ 52.83 62.66 52.83 62.66 71.11 62.66 71.11 RSUs - Under the Plan, we issued performance-based and time-based RSUs. RSUs are not actual shares, but rather a right to receive shares in the future. The shares are not issued and the employee cannot sell or transfer shares prior to vesting and has no voting rights until the RSUs vest. Employees who are granted RSUs do not receive dividend payments during the vesting period. The employees' performance-based RSUs will result in the delivery of shares if (a) performance criteria is met and (b) the employee remains employed, in good standing, through the date of the performance period of two years. The employees' time-based RSUs will result in the delivery of shares in one-third increments on the first, second and third anniversaries of the date of grant. Shares are issued net of applicable payroll tax withholdings. The grant date fair value of the RSUs is equal to the closing market price of our common stock on the grant date less the present value of dividends expected to be awarded during the service period. We recognize the grant date fair value of RSUs of shares we expect to issue as compensation expense ratably over the requisite service period. RSU Activity - The following table summarizes the RSU activity during the years ended December 31, 2020 and 2019: RSUs at December 31, 2018 Granted Vested Forfeited RSUs at December 31, 2019 Granted Vested Forfeited RSUs at December 31, 2020 Number of Units Weighted Average Fair Value $ 137,596 145,440 $ (60,915) $ (11,294) $ $ 210,827 266,880 $ (73,047) $ (57,861) $ $ 346,799 45.11 59.43 42.75 51.88 55.31 68.83 53.85 64.52 64.48 54 12. Retirement Plans As of December 31, 2020, we maintained a qualified defined contribution plan. Our qualified defined contribution plan covers substantially all employees and complies with Section 401 of the Internal Revenue Code. Under this plan, we stipulated a basic matching contribution that matches a portion of the participants' contribution based upon a defined schedule. Additionally, this plan contains a discretionary contribution component where we may contribute additional amounts based on a percentage of eligible employees' compensation. Contributions are invested by an independent investment company. The choice of investment alternatives is at the election of each participating employee. Our contributions to the plan were approximately $33.0 million, $26.7 million and $23.5 million for the years ended December 31, 2020, 2019 and 2018, respectively. As of December 31, 2020, we maintained an Employee Supplemental Savings Plan (ESSP), which is a nonqualified deferred compensation plan for certain key employees. Prior to January 1, 2020, eligible employees could defer up to 75% of qualified annual base compensation and 100% of bonus. Effective for the 2020 plan year, additional deferrals have been suspended. Contributions made in 2020 relate to deferrals on bonuses earned in 2019 but paid in 2020. In the ESSP, participant deferral accounts are credited with a rate of return based on investment elections as selected by the participant. The assets related to the ESSP are held in a rabbi trust owned by us for benefit of the participating employees. The trust investments are in the form of variable universal life insurance products, which are owned by us. These investments seek to replicate the return of the participant investment elections. Employee contributions to this plan were approximately $0.5 million, $3.4 million and $3.4 million for the years ended December 31, 2020, 2019 and 2018, respectively. We maintained a nonqualified supplemental defined benefit pension plan for certain retired employees of an acquired company as of December 31, 2020. These plans were informally and partially funded beginning in 1999 through a rabbi trust. Assets held in a rabbi trust are not eligible to be included in the calculation of plan status. At both December 31, 2020 and 2019, 100% of the rabbi trust assets were invested in a money market account with a commercial bank. All covered employees retired prior to 1998. Our benefit obligation was $0.7 million and $0.7 million at December 31, 2020 and 2019, respectively. 13. Income Taxes The domestic and foreign components of income operations before income taxes and equity method investments were as follows (in thousands): Domestic Foreign Income from operations before income taxes and equity method investments Year Ended December 31, 2020 2019 2018 156,496 $ 136,164 $ 110,514 (99) (66) 91 156,397 $ 136,098 $ 110,605 $ $ 55 The provision for income taxes was comprised of the following components (in thousands): Federal State Foreign Current provision (benefit) Federal State Deferred provision Federal State Foreign Year Ended December 31, 2019 2018 2020 $ 16,296 $ (9,092) $ 11,602 7,463 140 23,899 8,183 1,710 9,893 1,996 87 (10) 6,015 97 (2,980) 13,451 2,301 15,752 9,440 — — 4,937 133 16,672 8,010 3,586 11,596 234 28 — 262 28,530 Non-current provision resulting from allocating tax benefits directly to changes in liabilities Provision for income taxes 2,073 35,865 $ 9,440 22,212 $ $ The schedule of effective income tax rate reconciliation is as follows: Statutory U.S. Federal tax rate Increase (decrease) in tax rate resulting from: State taxes—net of Federal benefit Research and development credit Stock-based compensation ESSP Excess executive compensation Other, net Effective tax rate Year Ended December 31, 2019 2018 2020 21.0 % 21.0 % 21.0 % 4.9 % (1.8)% (0.9)% (0.7)% 0.7 % (0.3)% 22.9 % 4.8 % (8.8)% (1.3)% (1.0)% 0.8 % 0.8 % 16.3 % 6.1 % — % (2.2)% 0.4 % 0.8 % (0.3)% 25.8 % We paid income taxes, net of refunds of $23.9 million for the year ended December 31, 2020. We paid income taxes, net of refunds of $21.4 million for the years ended December 31, 2019. We received an income tax refund, net of payments of $4.3 million for the years ended December 31, 2018. 56 Deferred income taxes arise from temporary differences between the tax basis of assets and liabilities and their reported amounts in the financial statements. A summary of the tax effect of the significant components of deferred income taxes is as follows (in thousands): Goodwill and other intangibles Lease arrangements Property and equipment Unbilled receivables - IRC Section 481(a) Gross deferred tax liabilities Lease obligations Retirement and other liabilities Allowance for potential contract losses and other contract reserves Foreign and state operating loss carryforwards Less: Valuation allowance Gross deferred tax assets Net deferred tax liabilities December 31, 2020 2019 $ 152,412 $ 136,882 25,863 17,237 2,946 31,128 13,270 5,878 198,458 187,158 (28,652) (23,071) (4,815) (2,253) 1,971 (34,146) (18,614) (2,205) (2,239) 1,828 (56,820) $ 141,638 (55,376) $ 131,782 At December 31, 2020, we had state and foreign net operating losses of approximately $9.5 million and $1.7 million, respectively. The state net operating losses expire beginning 2027 through 2039. We recorded a full valuation allowance against the foreign net operating losses and a partial valuation allowance against the state net operating losses, as we do not believe those losses will be fully utilized in the future. A reconciliation of the beginning and ending balances of the total amounts of gross unrecognized tax benefits is as follows (in thousands): 2020 December 31, 2019 2018 Gross unrecognized tax benefits at beginning of year $ 9,635 $ 490 $ Increases in tax positions for current year Increases in tax positions for prior years Lapse in statute of limitations Decreases in tax positions for prior years Gross unrecognized tax benefits at end of year 1,712 371 (10) — 1,839 7,718 — (412) $ 11,708 $ 9,635 $ 220 320 36 (86) — 490 The total liability for gross unrecognized tax benefits as of December 31, 2020, 2019 and 2018 includes $11.7 million, $9.6 million and $0.4 million, respectively, of unrecognized net tax benefits which, if ultimately recognized, would reduce our annual effective tax rate in a future period. These liabilities, along with liabilities for interest and penalties, are included in accounts payable and accrued expenses and Other long-term liabilities in our consolidated balance sheet. Interest, which is included in Interest expense in our consolidated statement of income, was not material for all years presented. During the year ended December 31, 2020, we recognized an increase in unrecognized tax benefits of approximately $2.1 million of which $1.8 million related to an increase in research and development tax credits available to us. During the year ended December 31, 2019 we recognized an increase in unrecognized tax benefits related to available research and development credits of $7.7 million for tax years 2016-2018 and $1.8 million for the 2019 tax year. We are subject to income taxes in the U.S., various state and foreign jurisdictions. Tax statutes and regulations within each jurisdiction are subject to interpretation and require significant judgment to apply. We are no longer subject to U.S. federal or non-U.S. income tax examinations by tax authorities for the years before 2016. We are currently under examination by the Internal Revenue Services and various state tax authorities for tax years 2016-2018. We are no longer subject to U.S. state tax examinations by tax authorities for the years before 2015. Given the inherent uncertainty surrounding the on-going IRS 57 examination for tax years 2016-2018, we are unable to reasonably estimate the timing or change in amounts of our unrecognized tax benefits. 58 14. Quarterly Financial Information (Unaudited) The quarterly financial data reflects, in our opinion, all normal and recurring adjustments to present fairly the results of operations for such periods. Results of any one or more quarters are not necessarily indicative of annual results or continuing trends. The following tables set forth selected unaudited quarterly financial data: Revenues Operating income Income from operations before income taxes and equity method investments Net income Class A common stock: Basic weighted average common shares outstanding Basic earnings per share Diluted weighted average common shares outstanding Diluted earnings per share Class B common stock: Basic weighted average common shares outstanding Basic earnings per share Diluted weighted average common shares outstanding Diluted earnings per share Revenues Operating income Income from operations before income taxes and equity method investments Net income Class A common stock: Basic weighted average common shares outstanding Basic earnings per share Diluted weighted average common shares outstanding Diluted earnings per share Class B common stock: Basic weighted average common shares outstanding Basic earnings per share Diluted weighted average common shares outstanding Diluted earnings per share March 31, June 30, September 30, December 31, 2020 (in thousands, except per share data) 610,912 38,898 38,271 28,679 $ $ $ $ 632,492 39,586 39,091 29,948 $ $ $ $ 636,196 39,341 39,042 29,739 $ $ $ $ 26,992 27,082 27,139 0.71 $ 0.74 $ 0.74 $ 27,367 27,409 27,413 0.71 $ 0.74 $ 0.73 $ 13,187 13,187 13,187 0.71 $ 0.74 $ 0.74 $ 13,187 13,187 13,187 0.71 $ 0.74 $ 0.73 $ 638,784 40,224 39,993 32,164 27,207 0.80 27,528 0.79 13,177 0.80 13,177 0.79 March 31, June 30, September 30, December 31, 2019 (in thousands, except per share data) 501,930 28,532 28,196 21,118 $ $ $ $ 537,037 33,297 32,504 24,214 $ $ $ $ 579,179 38,402 37,794 27,937 $ $ $ $ 26,584 26,707 26,822 0.53 $ 0.61 $ 0.70 $ 26,819 26,936 27,128 0.53 $ 0.60 $ 0.69 $ 13,188 13,188 13,188 0.53 $ 0.61 $ 0.70 $ 13,188 13,188 13,188 0.53 $ 0.60 $ 0.69 $ 604,413 38,094 37,604 40,621 26,933 1.01 27,279 1.00 13,188 1.01 13,188 1.00 $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ 59 Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure We have had no disagreements with our auditors on accounting principles, practices or financial statement disclosure during and through the date of the financial statements included in this Report. Item 9A. Controls and Procedures Disclosure Controls and Procedures and Internal Control over Financial Reporting - Management is responsible for establishing and maintaining adequate disclosure controls and procedures and internal control over financial reporting. Disclosure controls and procedures are designed to provide reasonable assurance that information required to be disclosed in our reports filed or submitted under the Exchange Act, such as this Annual Report on Form 10-K, is accurately recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms. Disclosure controls and procedures are also designed to provide reasonable assurance that such information is accumulated and communicated to our management, including our principal executive officer and our principal financial officer, as appropriate to allow timely decisions regarding required disclosure. Internal control over financial reporting is a process designed by, or under the supervision of our principal executive officer and our principal financial officer, and effected by our Board of Directors, management and other personnel, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with GAAP and includes those policies and procedures that: • • • pertain to the maintenance of records that in reasonable detail accurately and fairly reflect the transactions and dispositions of our assets; provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with GAAP and that our receipts and expenditures are being made only in accordance with authorizations of management or our Board of Directors; and provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a material adverse effect on our financial statements. Limitations on the Effectiveness of Controls - Management, including our principal executive officer and our principal financial officer, does not expect that our disclosure controls and procedures or our internal control over financial reporting will prevent all errors and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints and the benefits of controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no assessment of controls can provide absolute assurance that all control issues and instances of fraud, if any, within us have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty and that breakdowns can occur because of a simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management's override of the control. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions; over time, controls may become inadequate because of changes in conditions or the degree of compliance with the policies or procedures may deteriorate. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected. Scope of the Assessments - The assessment by our principal executive officer and our principal financial officer of our disclosure controls and procedures and the assessment by our management of our internal control over financial reporting included a review of procedures and documents and discussions with other employees in our organization in order to evaluate the adequacy of our internal control system design. In the course of the evaluation, we sought to identify exposure to unprevented or undetected data errors, control problems or acts of fraud and to confirm that appropriate corrective action, including process improvements, were being undertaken. The assessment also included testing of properly designed controls to verify their effective performance. Our management used the criteria issued by the Committee of Sponsoring Organizations of the Treadway Commission in the Internal Control-Integrated Framework (2013) to assess the effectiveness of our internal control over financial reporting. We assess our disclosure controls and procedures and our internal control over financial reporting on an ongoing basis so that the conclusions concerning controls effectiveness can be reported in our Quarterly Reports on Form 10-Q and Annual Reports on Form 10-K. We consider the results of these assessment activities as we monitor our disclosure controls and procedures and our internal control over financial reporting. Our intent is to ensure that disclosure controls and procedures and internal control over financial reporting will be maintained and updated as conditions warrant. Among other matters, we sought in our assessment to determine whether there were any “material weaknesses” in our internal control over financial reporting, or 60 whether we had identified any acts of fraud involving senior management, management or other personnel who have a significant role in our internal control over financial reporting. This information was important both for the assessment generally and because the Section 302 certifications require that our principal executive officer and our principal financial officer disclose that information, along with any “significant deficiencies,” to the Audit Committee of our Board of Directors, and to our independent auditors and to report on related matters in this section of the Annual Report on Form 10-K. Assessment of Effectiveness of Disclosure Controls and Procedures - Based upon the assessments, our principal executive officer and our principal financial officer have concluded that, as of December 31, 2020, our disclosure controls and procedures were effective at the reasonable assurance level described above. Management's Report on Internal Control over Financial Reporting - Management is responsible for establishing and maintaining adequate control over financial reporting. Management used the criteria issued by the Committee of Sponsoring Organizations of the Treadway Commission in the Internal Control-Integrated Framework (2013) to assess the effectiveness of our internal control over financial reporting. Based upon the assessments, our management has concluded that, as of December 31, 2020, our internal control over financial reporting was effective. Our independent registered public accounting firm issued an attestation report concerning our internal control over financial reporting, which appears further in this Annual Report. Changes in Internal Control over Financial Reporting - During the three months ended December 31, 2020, there were no changes in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control for financial reporting. Item 9B. Other Information None. 61 REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM To the stockholders and the Board of Directors of ManTech International Corporation Opinion on Internal Control over Financial Reporting We have audited the internal control over financial reporting of ManTech International Corporation and subsidiaries (the “Company”) as of December 31, 2020, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2020, based on criteria established in Internal Control — Integrated Framework (2013) issued by COSO. We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated financial statements as of and for the year ended December 31, 2020, of the Company and our report dated February 19, 2021 expressed an unqualified opinion on those 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 included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and 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/ Deloitte & Touche LLP Mclean, Virginia February 19, 2021 62 Item 10. Directors, Executive Officers and Corporate Governance PART III The information concerning our directors and executive officers required by Item 401 of Regulation S-K is included under the captions “Election of Directors” and “Executive Officers,” respectively, in our definitive Proxy Statement to be filed with the Securities and Exchange Commission (SEC) in connection with our 2021 Annual Meeting of Stockholders (the “2021 Proxy Statement”), and that information is incorporated by reference in this Annual Report on Form 10-K. Our Standards of Ethics and Business Conduct, which sets forth the policies comprising our code of conduct, satisfies the SEC's requirements (including Item 406 of Regulation S-K) for a “code of ethics” applicable to our principal executive officer, principal financial officer, principal accounting officer, controller or persons performing similar functions, as well as Nasdaq's requirements for a code of conduct applicable to all directors, officers and employees. Among other principles, our Standards of Ethics and Business Conduct includes guidelines relating to the ethical handling of actual or potential conflicts of interest, compliance with laws, accurate financial reporting and procedures for promoting compliance with (and reporting violations of) these standards. A copy of our Standards of Ethics and Business Conduct is available on the investor relations section of our website: www.mantech.com. We are required to disclose any amendment to, or waiver from, a provision of our code of ethics that applies to our principal executive officer, principal financial officer, principal accounting officer, controller and persons performing similar functions. We intend to use our website as a method of disseminating this disclosure as permitted by applicable SEC rules. The information required by Item 407(d)(4) of Regulation S-K concerning the Audit Committee is included under the caption “Committees of the Board of Directors - Audit Committee” in our 2021 Proxy Statement and that information is incorporated by reference in this Annual Report on Form 10-K. The information required by Item 407(d)(5) of Regulation S-K concerning the designation of an audit committee financial expert is included under the caption “Committees of the Board of Directors - Audit Committee” in our 2021 Proxy Statement and that information is incorporated by reference in this Annual Report on Form 10-K. Item 11. Executive Compensation The information required by this Item is included under the captions “Non-Employee Director Compensation Table,” “Certain Relationships and Related Person Transactions - Compensation Committee Interlocks and Insider Participation,” “Compensation Committee Report” and “Compensation Discussion and Analysis” and the related text and tables in our 2021 Proxy Statement and that information is incorporated by reference in this Annual Report on Form 10-K. Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters The information required by Item 403 of Regulation S-K is included under the caption “Beneficial Ownership of Our Stock” in our 2021 Proxy Statement, and that information is incorporated by reference in this Annual Report on Form 10-K. 63 Securities Authorized for Issuance under Equity Compensation Plans The following table provides information as of December 31, 2020 with respect to compensation plans (including individual compensation arrangements) under which our equity securities are authorized for issuance. Equity Compensation Plan Information Number of securities to be issued upon exercise of outstanding options, warrants and rights (a) Weighted- average exercise price of outstanding options, warrants and rights (b) 785,827 — 785,827 $ $ 56.33 — 56.33 Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a)) (c) 7,160,951 — 7,160,951 Plan Category Equity compensation plans approved by security holders Equity compensation plans not approved by security holders Total The plan contains a formula that automatically increases the number of securities available for issuance. The plan provides that the number of shares available for issuance under the plan automatically increases on the first trading day of January each calendar year during the term of the plan by an amount equal to 1.5% of the total number of shares outstanding (including all outstanding classes of common stock) on the last trading day in December of the immediately preceding calendar year, but provides that in no event should any such annual increase exceed 1,500,000 shares. On January 2, 2021, there were 607,066 shares added to the plan under this provision. Item 13. Certain Relationships and Related Transactions, and Director Independence The information required by this Item is included under the captions “Certain Relationships and Related Person Transactions” and “Corporate Governance - Director Independence” in our 2021 Proxy Statement and that information is incorporated by reference in this Annual Report on Form 10-K. Item 14. Principal Accounting Fees and Services The information required by this Item is included under the caption “Ratification of Appointment of Independent Auditors” in our 2021 Proxy Statement and that information is incorporated by reference in this Annual Report on Form 10-K. 64 PART IV Item 15. Exhibits, Financial Statement Schedule (a) The following documents are filed as a part of this Annual Report on Form 10-K: (1) All financial statements: DESCRIPTION Report of Independent Registered Public Accounting Firm Consolidated Balance Sheets as of December 31, 2020 and 2019 Consolidated Statements of Income for the years ended December 31, 2020, 2019 and 2018 Consolidated Statements of Comprehensive Income for the years ended December 31, 2020, 2019 and 2018 Consolidated Statements of Changes in Stockholders' Equity for the years ended December 31, 2020, 2019 and 2018 Consolidated Statements of Cash Flows for the years ended December 31, 2020, 2019 and 2018 Notes to Consolidated Financial Statements PAGE 28 30 31 32 33 34 36 (2) Financial statement schedule: SCHEDULE NO. DESCRIPTION Schedule II Valuation and Qualifying Accounts for the years ended December 31, 2020, 2019 and 2018 PAGE 69 Exhibits required by Item 601 of Regulation S-K (each management contract or compensatory plan or (3) arrangement required to be filed as an exhibit to this annual report pursuant to Item 15(b) of this annual report is identified in the Exhibit list below): Exhibit Description Second Amended and restated Certificate of Incorporation of the registrant as filed with the Secretary of State of the State of Delaware on January 30, 2002 (incorporated herein by reference from registrant's Registration Statement on Form S-1 (File No. 333-73946), as filed with the Securities and Exchange Commission (SEC) on November 23, 2002, as amended). Second Amended and Restated Bylaws of the registrant (incorporated herein by reference from registrant's Annual Report on Form 10-K for the year ended December 31, 2003, as filed with the SEC on March 15, 2004, as amended). Third Amended and Restated Bylaws of the Registrant (incorporated herein by reference from registrant's Current Report on Form 8-K, as filed with the SEC on December 13, 2017). Form of Common Stock Certificate (incorporated herein by reference from registrant's Registration Statement on Form S-1 (File No. 333-73946), as filed with the SEC on November 23, 2001, as amended). Description of Securities of the Registrant (incorporated herein by reference from registrant’s Annual Report on Form 10-K for the year ended December 31, 2019, as filed with the SEC on February 21, 2020). 10-K for the year ended December 31, 2019, as filed with the SEC on February 21, 2020). Second Amended and Restated Credit Agreement dated August 17, 2017, by and among the registrant and a syndicate of lenders, including Bank of America, N.A., acting as administrative agent for the lenders (incorporated herein by reference from the registrant's Current Report on Form 8-K, as filed with the SEC on August 23, 2017.) Retention Agreement, effective as of January 1, 2002, between George J. Pedersen and the registrant (incorporated herein by reference from registrant's Registration Statement on Form S-1 (File No. 333-73946), as filed with the SEC on November 23, 2001, as amended). ManTech International Corporation 2020 Executive Incentive Compensation Plan, adopted on March 4, 2020 in which our executive officers participate (incorporated herein by reference from registrant’s Current Report on Form 8-K, as filed with the SEC on March 10, 2020). Management Incentive Plan of ManTech International Corporation - 2016 Restatement (incorporated herein by reference from registrant's Quarterly Report on Form 10-Q for the quarter ended June 30, 2016, as filed with the SEC on July 29, 2016). 3.1 3.2 3.3 4.1 4.2 10.1 10.2* 10.3* 10.4* 65 Form of Grant of Non-Qualified Stock Options granted under the Management Incentive Plan (incorporated herein by reference from the registrant's Annual Report on Form 10-K for the year ended December 31, 2011, as filed with the SEC on February 24, 2012). Standard Terms and Conditions for Non-Qualified Stock Options granted under the Management Incentive Plan (incorporated herein by reference from registrant's Annual Report on Form 10-K for the year ended December 31, 2011, as filed with the SEC on February 24, 2012). Form of Grant of Restricted Stock granted under the Management Incentive Plan (incorporated herein by reference from registrant's Annual Report on Form 10-K for the year ended December 31, 2011, as filed with the SEC on February 24, 2012). Standard Terms and Conditions for Restricted Stock granted under the Management Incentive Plan (incorporated herein by reference from registrant's Annual Report on Form 10-K for the year ended December 31, 2011, as filed with the SEC on February 24, 2012). Form of Performance-Based Restricted Stock Unit Agreement granted under the Management Incentive Plan (incorporated herein by reference from registrant's Current Report on Form 8-K, as filed with the SEC on March 13, 2017). Form of Executive Continuity and Stay Incentive Agreement, by and between each of our executive officers and the registrant, (incorporated herein by reference from registrant's Annual Report on Form 10-K for the year ended December 31, 2015, as filed with the SEC on February 19, 2016.) Restricted Stock Unit Award Agreement, dated as of November 7, 2016, granted under the Management Incentive Plan, between the Company and Kevin Phillips. Form of Time-Based Restricted Stock Unit Award Agreement granted under the Management Incentive Plan (incorporated herein by reference from registrant's Current Report on Form 8-K, as filed with the SEC on March 9, 2018). Subsidiaries of the Registrant. Independent Registered Public Accounting Firm Consent. Power of Attorney (included on signature page). Certification of Chief Executive Officer pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as amended. Certification of Chief Financial Officer pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as amended. Certification of Chief Executive Officer and Chief Financial Officer pursuant to Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended. Inline XBRL Instance Document (the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document). 10.5* 10.6* 10.7* 10.8* 10.9* 10.10* 10.11* 10.12* 21.1‡ 23.1‡ 24.1 31.1‡ 31.2‡ 32‡ 101.INS 101.SCH Inline XBRL Taxonomy Extension Schema Document. 101.CAL Inline XBRL Taxonomy Extension Calculation Linkbase Document. 101.DEF Inline XBRL Taxonomy Extension Definition Linkbase Document. 101.LAB Inline XBRL Taxonomy Extension Label Linkbase Document. 101.PRE Inline XBRL Taxonomy Extension Presentation Linkbase Document. 104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101). * Management contract or compensatory plan or arrangement required to be filed as an Exhibit to this report pursuant to Item 15(a)(3). ‡ Filed herewith 66 Item 16. Form 10-K Summary. None. 67 Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. SIGNATURES MANTECH INTERNATIONAL CORPORATION By: Name: Title: Date: /s/ KEVIN M. PHILLIPS Kevin M. Phillips Chairman, Chief Executive Officer and President February 19, 2021 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. Each person whose signature appears below hereby constitutes and appoints each of Kevin M. Phillips or Michael Putnam as his/her attorney-in-fact and agent, with full power of substitution and resubstitution for him/her in any and all capacities, to sign any or all amendments to this Report and to file same, with exhibits thereto and other documents in connection therewith, granting unto such attorney-in-fact and agent full power and authority to do and perform each and every act and thing requisite and necessary in connection with such matters and hereby ratifying and confirming all that such attorney-in-fact and agent or his/her substitutes may do or cause to be done by virtue hereof. Name and Signature Title Date /s/ KEVIN M. PHILLIPS Chairman, Chief Executive Officer and President February 19, 2021 Kevin M. Phillips (Principal Executive Officer) /s/ JUDITH L. BJORNAAS Chief Financial Officer February 19, 2021 Judith L. Bjornaas (Principal Financial Officer and Principal Accounting Officer) February 19, 2021 February 19, 2021 February 19, 2021 February 19, 2021 February 19, 2021 February 19, 2021 February 19, 2021 /s/ GEORGE J. PEDERSEN George J. Pedersen /s/ RICHARD L. ARMITAGE Richard L. Armitage /s/ MARY K. BUSH Mary K. Bush Director Director Director /s/ BARRY G. CAMPBELL Director Barry G. Campbell /s/ RICHARD J. KERR Richard J. Kerr /s/ PETER B. LAMONTAGNE Peter B. LaMontagne /s/ KENNETH A. MINIHAN Kenneth A. Minihan Director Director Director 68 Valuation and Qualifying Accounts SCHEDULE II Activities in our allowance accounts for the years ended December 31, 2020, 2019 and 2018 were as follows (in thousands): Doubtful Accounts Charged to Costs and Expenses Balance at Beginning of Period $ $ $ 6,157 6,233 11,578 — 3,000 5,244 Deductions Other* Balance at End of Period — — — 76 2,345 1,555 $ $ $ 6,233 11,578 18,377 2018 2019 2020 * Other represents doubtful account reserves released or recorded as part of net revenues for estimated customer disallowances. Deferred Tax Asset Valuation Balance at Beginning of Period Charged to Costs and Expenses $ $ $ 717 1,537 1,828 820 291 143 Deductions Other — — — Balance at End of Period — $ — $ — $ 1,537 1,828 1,971 2018 2019 2020 69 [THIS PAGE INTENTIONALLY LEFT BLANK] CORPORATION INFORMATION Corporate Headquarters ManTech International Corporation 2251 Corporate Park Drive Herndon, VA 20171 703-218-6000 mantech.com Employment ManTech is committed to providing equal employment opportunities and an inclusive work environment to all employees. It is ManTech’s policy to ensure that all employment actions, including but not limited to recruiting, hiring, discipline, promotions, and separations, occur without unlawful regard to any characteristic protected by federal, state, or local law. SHAREHOLDER INFORMATION Transfer Agent Stockholders may obtain information with respect to share position, transfer requirements, address changes, lost stock certificates, and duplicate mailings by writing or phoning: American Stock Transfer & Trust Co. 6201 15th Avenue Brooklyn, NY 11219 Attn: Shareholder Services 800-937-5449 or 718-921-8124 www.astfinancial.com Annual Meeting ManTech’s Annual Meeting will be held on Friday, May 21, 2021, 11:00 AM ET, at 2251 Corporate Park Drive, Herndon, VA 20171 Stock Exchange Class A Common Stock Symbol: MANT Listed: Nasdaq Stock Market Independent Auditors Deloitte & Touche LLP McLean, VA Investor Relations Questions from shareholders, analysts and others can be directed to: Stephen Vather Vice President, Corporate Development & Investor Relations 703-218-6093 email: stephen.vather@mantech.com ManTech’s earnings announcements, news releases, SEC filings, and other investor information are available in the Investor Relations section of our website at investor.mantech.com. 2020 ANNUAL REPORT FORWARD-LOOKING STATEMENTS All statements and assumptions contained in this Annual Report that do not relate to historical facts constitute “forward-looking statements.” These statements can be identified by the fact that they do not relate strictly to historical or current facts. Forward-looking statements often include the use of words such as “may,” “will,” “expect,” “intend,” “anticipate,” “believe,” “estimate,” “plan,” and words and terms of similar substance in connection with discussions of future events, situations or financial performance. While these statements represent our current expectations, no assurance can be given that the results or events described in such statements will be achieved. These forward-looking statements are inherently subject to risks and uncertainties, and actual results and outcomes may differ materially from the results and outcomes we anticipate. Factors that could cause actual results to differ materially from the results we anticipate include, but are not limited to the following: failure to maintain our relationship with the U.S. government, or the failure to compete effectively for new contract awards or to retain existing U.S. government contracts; disruptions to our business resulting from the COVID-19 pandemic or other similar global health epidemics, pandemics and/or other disease outbreaks; adverse changes in U.S. government spending for programs we support, whether due to changing mission priorities, socio-economic policies or federal budget constraints generally; inability to recruit and retain a sufficient number of employees with specialized skill sets or necessary security clearances who are in great demand and limited supply; failure to compete effectively for awards procured through the competitive bidding process, and the adverse impact of delays resulting from our competitors’ protests of new contracts that are awarded to us; disruptions to our business or damage to our reputation resulting from cyber attacks and other security threats; failure to obtain option awards, task orders or funding under our contracts; the government renegotiating, modifying or terminating our contracts; failure to comply with, or adverse changes in, complex U.S. government laws and procurement regulations; adverse results of U.S. government audits or other investigations of our government contracts; failure to successfully integrate acquired companies or businesses into our operations or to realize any accretive or synergistic effects from such acquisitions; failure to mitigate risks associated with conducting business internationally; and adverse changes in business conditions that may cause our investments in recorded goodwill to become impaired. These and other risk factors are more fully discussed in the section entitled “Risk Factors” in ManTech’s Annual Report on Form 10-K previously filed with the Securities and Exchange Commission on Feb. 19, 2021, Item 1A of Part II of our Quarterly Reports on Form 10-Q, and, from time to time, in ManTech’s other filings with the Securities and Exchange Commission. We urge you not to place undue reliance on these forward-looking statements, which speak only as of the date of this Annual Report. We undertake no obligation to update any forward-looking statement made herein following the date of this Annual Report, whether as a result of new information, subsequent events or circumstances, changes in expectations or otherwise. 2_21