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Zix

zixi · NASDAQ Technology
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Ticker zixi
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Industry Software - Infrastructure
Employees 51-200
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FY2015 Annual Report · Zix
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2015 Annual Report 

 
 
 
 
 
 
 
 
 
 
Statements  in  this  document  that  are  not  purely  historical  facts  or  that  necessarily 
depend  upon  future  events,  including  statements  about  forecasts  of  sales,  revenue  or 
earnings,  or  other  statements  about  anticipations,  beliefs,  expectations,  hopes, 
intentions  or  strategies  for  the  future,  may  be  forward-looking  statements  within  the 
meaning of Section 21E of the Securities Exchange Act of 1934, as amended. Readers 
are  cautioned  not  to  place  undue  reliance  on  forward-looking  statements.  All  forward-
looking  statements  are  based  upon  information  available  to  ZixCorp  on  the  date  this 
document was printed. ZixCorp undertakes no obligation to publicly update or revise any 
forward-looking  statements,  whether  as  a  result  of  new  information,  future  events  or 
otherwise.  Any  forward-looking  statements  involve  risks  and  uncertainties  that  could 
cause actual events or results to differ materially from the events or results described in 
the  forward-looking  statements,  including  risks  or  uncertainties  related  to  market 
acceptance of new ZixCorp solutions and how privacy and data security laws may affect 
demand  for  ZixCorp  email  data  protection  solutions.  ZixCorp  may  not  succeed  in 
addressing these and other risks. Further information regarding factors that could affect 
ZixCorp  financial  and  other  results  can  be  found  in  the  risk  factors  section  of  the 
accompanying annual report on Form 10-K. 

April 29, 2016 

To Our Shareholders, 

In 2015, ZixCorp delivered record-breaking growth, strengthened our position in the email 
encryption market and began the transition to new leadership. 

Our positive financial performance included full-year new first year orders (NFYOs) of $10.2 
million, an increase of 19.7% year-over-year and a new company record. We achieved full-year 
revenue of $54.7 million, an increase of 8.7% year-over-year, and a backlog of $74.2 million for 
contractually committed orders at year end, an increase of 7.0% from the prior year end. The 
Company generated approximately $15.6 million in cash flow from operations, an increase of 
17.3% year-over-year, and we met the high end of our guidance by delivering full-year Non-
GAAP fully diluted earnings per share of $0.21, an increase of 43.8% year-over-year. 

Our results reflect success across all go to market channels. Our direct sales teams contributed 
32% of our record-breaking NFYOs, and our program of strategic partners, value added resellers 
and managed service providers contributed 65% of NFYOs. 

Focusing on the growth of our strategic partners, we are pleased that the contribution from 
Google has returned to more historical levels. Our relationship with Cisco continues to progress 
since announcing the partnership in March 2015. Together we launched two products, and we 
are excited about the level of collaboration in sales and marketing. 

Our strategic relationships with global leaders Cisco and Google are a reflection of our industry-
leading email encryption. Our solutions are unrivaled in their ease of use for senders and 
recipients. With proven content filters, emails are automatically scanned and encrypted, 
alleviating stress for senders and providing peace of mind for companies that prioritize the 
protection of sensitive information. The recipient experience is mobile-friendly and as easy as two 
steps or less, enabling customers and business partners to value security without frustration. 

Our ease of use has enabled us to build a customer base of more than 13,500 organizations. 
Membership in the ZixDirectory has exceeded 50 million, a significant milestone for our company 
but an even greater benefit to our rate of transparent email encryption. 

For example, we have a New York-based legal customer that implemented ZixGateway in 2012. 
Since joining the Zix community, the customer’s secure email transparency rate has reached 
94%. Without any passwords or extra steps, this customer and their recipients exchange 
encrypted email as easily as regular email. Our ease of use occurs automatically in the 
background to protect our customer and their clients’ sensitive data. 

Our solution is what email is meant to be: easy and secure. Without interference to 
communication or workflow, the communities our customers serve, live in and care about can 
adopt our solution and transfer information in a protected manner. For our customers, email 
encryption meets data security and compliance needs, but it also enables them to safeguard their 
trusted relationships. 

Our commitment to easy to use, secure communication will remain the company’s focus with 
David Wagner as our new chief executive officer. 

We appreciate the many contributions of David’s predecessor, Rick Spurr. Rick led the company 
to stability and success for more than 10 years, and he maintained an active leadership role to 
ensure a smooth transition during the candidate search, as evidenced by our record-breaking 

 
financial results in 2015. We look forward to Rick’s continued contribution as a director of the 
board. 

We are confident that David is the best person to lead our company in 2016 and the future. 
David’s experience in the data security industry will complement the company’s leadership in 
email encryption. His character will enhance the already strong culture of the company, and his 
vision will enable ZixCorp to take the necessary steps for improved growth. 

On behalf of ZixCorp’s board of directors and management team, I want to express appreciation 
to our customers for your trust and loyalty, to our employees for your dedication, diligence and 
professionalism, and to our shareholders for your continued support. 

Sincerely, 

Robert C. Hausmann 
Chairman of the Board 

 
United States 
SECURITIES AND EXCHANGE COMMISSION 
Washington, D.C. 20549 

Form 10-K 

(Mark One) 
(cid:95)  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 

For the fiscal year ended December 31, 2015 

(cid:134)  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 
For the transition period from            to             

Commission File Number: 0-17995 

Zix Corporation 

(Exact Name of Registrant as Specified in its Charter) 

Texas 
(State or Other Jurisdiction of 
Incorporation or Organization) 

75-2216818 
(I.R.S. Employer 
Identification Number) 

2711 N. Haskell Avenue, Suite 2200, LB 36, Dallas, Texas 75204-2960 
(Address of Principal Executive Offices) 

(214) 370-2000 
(Registrant’s Telephone Number, Including Area Code) 

Securities Registered Pursuant to Section 12(b) of the Act: 

Title of each class of stock 
Common Stock 
$0.01 Par Value 

Name of each exchange on which registered 
NASDAQ 

Securities Registered Pursuant to Section 12(g) of the Act: None 

Indicate by check mark whether the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  (cid:134)    No  (cid:95) 

Indicate by check mark whether the Registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  (cid:134)    No  (cid:95) 

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  (cid:95)    No  (cid:134) 

Indicate by check mark whether the Registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data 

File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for 
such shorter period that the registrant was required to submit and post such reports)    Yes  (cid:95)    No  (cid:134) 

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained 
herein, and will not be contained, to the best of Registrant’s knowledge, in definitive proxy or information statements incorporated by reference in 
Part III of this Form 10-K or any amendment to this Form 10-K.  (cid:95) 

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. 

See definitions of “large accelerated filer”, “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one): 

Large accelerated filer 

(cid:134) 

Non-accelerated filer 

(cid:134)  (Do not check if a smaller reporting company) 

Accelerated filer 

(cid:95)

Smaller reporting company  (cid:134)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  (cid:134)    No  (cid:95) 

As of March 8, 2016, there were 56,158,434 shares of Zix Corporation $0.01 par value common stock outstanding. As of June 30, 2015, the 

aggregate market value of the shares of Zix Corporation common stock held by non-affiliates was $261,306,219. 

Portions of the Registrant’s 2016 Proxy Statement are incorporated by reference into Part III of this Form 10-K. 

DOCUMENTS INCORPORATED BY REFERENCE 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TABLE OF CONTENTS 

Item 1. 
Item 1A. 
Item 1B. 
Item 2. 
Item 3. 
Item 4. 

Item 5. 
Item 6. 
Item 7. 
Item 7A. 
Item 8. 
Item 9. 
Item 9A. 
Item 9B. 

Item 10. 
Item 11. 
Item 12. 
Item 13. 
Item 14. 

Item 15. 

  PART I 
  Business ................................................................................................................................................................................. 
  Risk Factors ........................................................................................................................................................................... 
  Unresolved Staff Comments .................................................................................................................................................. 
  Properties ............................................................................................................................................................................... 
  Legal Proceedings .................................................................................................................................................................. 
  Mine Safety Disclosures ........................................................................................................................................................ 
  PART II 
  Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities ............. 
  Selected Financial Data ......................................................................................................................................................... 
  Management’s Discussion and Analysis of Financial Condition and Results of Operations ................................................. 
  Quantitative and Qualitative Disclosures About Market Risk ............................................................................................... 
  Financial Statements and Supplementary Data ...................................................................................................................... 
  Changes in and Disagreements with Accountants on Accounting and Financial Disclosure ................................................. 
  Controls and Procedures ........................................................................................................................................................ 
  Other Information .................................................................................................................................................................. 
  PART III 
  Directors, Executive Officers and Corporate Governance ..................................................................................................... 
  Executive Compensation ....................................................................................................................................................... 
  Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters ......................................... 
  Certain Relationships and Related Transactions, and Director Independence ....................................................................... 
  Principal Accountant Fees and Services ................................................................................................................................ 
  PART IV 
  Exhibits and Financial Statement Schedules.......................................................................................................................... 

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PART I 

Item 1. Business 

Zix Corporation (“ZixCorp®,” the “Company,” “we,” “our,” or “us”) offers email encryption, data loss prevention and Bring-
Your-Own-Device (“BYOD”) security to meet business data protection and compliance needs. We primarily serve organizations in 
the healthcare, financial services, insurance and government sectors, including significant federal financial regulators, such as the 
Federal Financial Institutions Examination Council (“FFIEC”), divisions of the U.S. Treasury, the U.S. Securities and Exchange 
Commission (“SEC”), one in every four U.S. banks, more than 30 Blue Cross Blue Shield organizations and one in every five U.S. 
hospitals. 

Zix® Email Encryption enables the secure exchange of emails that include sensitive information through a comprehensive secure 
messaging service, which allows an enterprise to use policy-driven rules to determine which email messages should be sent securely to 
comply with regulations or company-defined policies.  

The main differentiator for Zix Email Encryption in the marketplace is its exceptional ease of use. The best example of this is its 

ability to provide transparent delivery of encrypted email. Most email encryption solutions are focused on the sender. They typically 
introduce an added burden on recipients, often requiring additional user authentication with the creation of a new user identity and 
password. We designed our solution to alleviate the recipient’s burden by enabling the delivery of encrypted email automatically and 
transparently. ZixCorp enables transparent delivery through (1) ZixDirectory®, the world’s largest email encryption community, which 
is designed to share identities of our tens of millions of members (growing by approximately 140,000 members per week), (2) 
ZixCorp’s patented Best Method of Delivery®, which is designed to deliver email in the most secure, most convenient method possible 
for the recipient, and (3) ZixGateway®, which automatically encrypts and decrypts messages with sensitive content. The result is the 
industry’s only transparent encrypted email, such that secure email can be exchanged without extra steps or passwords for both 
senders and receivers. ZixCorp delivers more than 1,100,000 encrypted messages on a typical business day. Of those messages, 70% 
are exchanged transparently between senders and recipients. 

ZixCorp launched ZixDLP®, an email-specific data loss prevention (“DLP”) solution in early 2013. By focusing strictly on 

email, ZixDLP addresses business’s greatest source of data loss – corporate email. The straightforward DLP approach decreases the 
complexity and cost often associated with other DLP solutions. ZixDLP is also designed to reduce deployment time from months to 
hours and minimize impact on customer resources and workflow. In addition, ZixDLP offers a convenient experience for both 
employees interacting with the solution and administrators managing the system. 

Leveraging the company’s leadership and expertise in email encryption, ZixDLP uses ZixCorp’s proven policy and content 

scanning capabilities with new quarantine functionality. The quarantine system and its intuitive interface allow administrators to (1) 
easily define policies and create custom content filters for quarantining email messages, (2) conveniently manage quarantined 
messages using flexible searching and filtering options, (3) release or delete individual or multiple quarantined messages with one 
click, (4) review reports that monitor quarantine activities and trends and (5) automate custom notifications informing employees of 
quarantined messages. 

ZixDLP is available as an add-on for existing ZixCorp customers or as a bundle with Zix Email Encryption for new customers. 

ZixDLP is also available as a standalone solution that can easily integrate with most email systems and email encryption solutions. 

In late 2013, ZixCorp launched ZixOne®, a unique mobile email app that solves the key IT challenge created by the BYOD trend 

in the workplace. BYOD describes the increasing trend of employees using their personal devices to conduct work. ZixOne provides 
access to corporate email while never allowing that data to be persistently stored on the device where it is vulnerable to loss or theft. If 
the device is lost or stolen, an administrator can simply disable access to corporate email from that device through ZixOne. 

Unlike other BYOD solutions, ZixOne meets employee demands of convenience, control and privacy while giving companies 

the ability to secure corporate data and meet compliance needs. With seamless access to work email in a secure, simple-to-use 
environment, employees can stay productive while preserving device independence. A BYOD solution that is acceptable to employees 
and yet provides strong data protection for corporate data solves one of today’s greatest IT management challenges. 

Our business operations and service offerings are supported by the ZixData CenterTM, a SysTrust/SOC3 certified, SOC2 

accredited, PCI DSS V3.1 certified facility. The operations of the ZixData Center are independently audited annually to maintain 
AICPA SysTrust/SOC3 certification in the areas of security, confidentiality, integrity and availability. Auditors also produce a SOC2 
(formerly SAS70 Type II) report on the effectiveness of operational controls used over the audit period. The ZixData Center is staffed 
24 hours a day with a track record that exceeds 99.99% availability. 

3 

Our company was incorporated in Texas in 1988. Originally named Amtech Corporation, we changed our name to ZixIt® 

Corporation in 1999 when we entered the encrypted email market. In 2002, we became Zix Corporation. Our executive offices are 
located at 2711 North Haskell Avenue, Suite 2200, LB 36, Dallas, Texas 75204-2960, (214) 370-2000. 

Overview 

Email is a mission-critical means of communication for enterprises. However, if email leaves a secure network environment in 

clear text, it can be intercepted along the path between a sender and a recipient, which permits theft, redirection, manipulation or 
exposure to unauthorized parties. Failure to control and manage such risks can result in enforcement penalties for noncompliance 
under numerous regulations, in addition to damaged reputation, competitive disadvantage, a loss of intellectual property or other 
corporate assets, exposure to negligence or liability claims, and diversion of resources to repair such damage. For example, healthcare 
organizations, business associates and sub-contractors are subject to the Privacy, Security, and Enforcement Rules of the Health 
Information Portability and Accountability Act (“HIPAA”) as amended by the Health Information Technology for Economic and 
Clinical Health Act (“HITECH Act”). Financial institutions are subject to data privacy laws including the Gramm-Leach-Bliley Act 
(“GLBA”). These federal laws help drive the use of encrypted email. In addition, individual states such as Massachusetts and Nevada 
have enacted privacy laws requiring encryption of certain email messages, and almost all states encourage email encryption by 
allowing exemptions from data breach notification laws. 

Corporations require easy to use, cost-effective email protection that can be used on an enterprise-wide basis. They need it to be 

quickly deployed and regularly updated to evolve with innovative technology practices and meet changing regulatory standards. To 
satisfy these needs, our Email Encryption Service provides a comprehensive solution that analyzes and encrypts email 
communications. 

Our Email Encryption Service allows a user to send encrypted email to any email user anywhere and on any Internet-enabled 

device. Encrypted email is delivered through the patented Best Method of Delivery protocol which automatically determines the most 
direct and appropriate means of delivery, based on the sender’s and recipient’s communications environment and preferences. The 
protocol supports a number of encrypted email delivery mechanisms, including S/MIME, Transport Layer Security (“TLS”), Open 
Pretty Good Privacy (“PGP”), “push” delivery and secure portal “pull” delivery. These last two mechanisms enable users to send 
messages securely to anyone with an email address, including those who do not have an encryption tool. Our Best Method of Delivery 
makes the technology simple for end users and provides flexibility and ease of implementation for information technology 
professionals. We believe the ability to send messages through different modes of delivery is one of many differentiators that makes 
our Email Encryption Service superior to competitive offerings. 

The deployment of our Email Encryption Service at the periphery of the customer’s network means our Email Encryption 

Service encrypts outbound email for an enterprise without the need to create, deploy or manage end user encryption keys or deploy 
desktop software. Our technology solutions are easy to use, easy to deploy, and can be made operational quickly. 

Our service has an integrated policy management capability. This policy engine can inspect the contents of emails and apply 

policies matching specific industry criteria such as HIPAA, the HITECH Act and GLBA. Customers can also build their own custom 
policies. This policy driven email encryption for regulatory compliance means customers can reduce the training required of their staff 
and significantly reduce the risk of inadvertently sending sensitive content by controlling the method of delivery through preset 
policies. 

Competition 

The most significant differentiator for Zix Email Encryption Service as compared with our competition is ease of use. The best 
example of our unequalled ease of use is transparent delivery of encrypted email messages. We are able to deliver transparent email 
encryption as a result of our ZixDirectory, Best Method of Delivery and ZixGateway. The most critical and highly differentiated 
component of our solution is the ZixDirectory which provides the ability to share user identities for encryption, which in turn provides 
frictionless interoperability between users in a community of interest such as healthcare, finance or government. 

Our capability to offer interoperability is particularly important when it is necessary to communicate with external networks, as 
is the case with the healthcare and financial services markets. Our customers become part of the ZixDirectory, a global “white pages” 
enabling transparent secure communications with other ZixGateway customers using our centralized key management system and 
overall unique approach to implementing secure email. We enable secure communications with other users via TLS, Open PGP, 
“push” delivery and secure portal “pull” delivery mechanisms. However, we believe our unique transparent delivery is the more 
preferred delivery model. 

4 

Zix Email Encryption and Zix DLP focus on the secure (i.e., encrypted) delivery and data loss prevention sub-segments of the 

email security market. We view our primary competitors in this space to be Proofpoint Inc., Microsoft, Barracuda Networks, and 
Sophos Inc. Technically, while these companies offer “send-to-anyone” encrypted email, we believe they are unable to offer the 
benefits that come from access to the ZixDirectory, use of our Best Method of Delivery protocol, and the industry’s only transparent 
email encryption. Nevertheless, some of these competitors are large enterprises with substantial financial and technical resources that 
exceed those we possess. 

As discussed above, with the introduction of ZixOne, the Company entered the BYOD mobile device security market. In the 

BYOD market, we view our primary competitors as companies that provide enterprise mobility management (“EMM”), which 
includes but is not limited to mobile device management (“MDM”), containerization and app wrapping technology. EMM is premised 
on storing business data on an employee’s personally owned device. In order to secure business data on personal devices, EMM 
requires individual users to permit their employer access to and control over personally owned smartphones and tablet computers and 
therefore can create user concerns about loss of control and privacy of their devices. In contrast, ZixOne enables Android® or IOS® 
mobile devices to view remotely stored corporate email, calendar and contacts, and to interact with that data. ZixOne more effectively 
protects business email data by never allowing it to be stored on the device, where it might be subjected to exposure from theft or loss 
of the device. Moreover, ZixOne does not require employees to relinquish device control or personal privacy to their employer. We 
believe these differentiators make ZixOne an attractive BYOD solution. Nevertheless, ZixCorp is new to the BYOD and mobile 
security space, whereas competitors have an established brand in the market with substantial financial and technical resources that 
exceed those we possess. We view our primary competitors in this space to be AirWatch/VMware, Citrix (with XenMobile), Good 
Technology (purchased by Blackberry), IBM/Fiberlink (with MaaS360), Microsoft (with ActiveSync), and MobileIron. 

Regulatory Drivers 

We have been successful in securing additional market penetration for Zix Email Encryption in our target vertical markets of 

healthcare, finance services and government due to regulations that address the need for email privacy and security. 

In addition to the need to protect sensitive business communication, demand for email encryption in the healthcare sector, 
including business associates of healthcare providers, is augmented by regulatory requirements under HIPAA and HITECH Act. The 
Privacy and Security rules under those acts provide severe penalties for violations, include strict breach notification requirements, and 
allow states to pursue HIPAA violations. In the financial services industry, financial institutions and their service providers are subject 
to the GLBA, which is enforced by the U.S. Federal Trade Commission (“FTC”). The FTC has issued guidance saying that businesses 
that transmit sensitive data by email should be sure to encrypt the data. 

In choosing an email security provider, companies are influenced by the solutions chosen by their regulators. Our customers 
include all of the federal regulators who comprise the FFIEC as well as the state banking regulators in more than twenty states. Our 
service is also a recommended solution of the Conference of State Bank Supervisors, whose members regulate the more than 6,000 
state-chartered banks in the U.S. 

Additionally, state data breach laws and privacy regulations, along with highly publicized breaches, have enhanced security 

awareness in vertical markets outside of healthcare and financial services and have prompted affected organizations to consider 
adopting systems that ensure data security and privacy. Even where there are no specific regulations, businesses may require email 
protection to adhere to evolving industry best practices for protecting sensitive information. 

Sales and Marketing 

We sell our Zix Email Encryption, Zix DLP and ZixOne Services through a direct sales force that focuses on larger businesses 

and a telesales force that focuses on small to medium-sized accounts. We also use a network of resellers and other distribution 
partners, including other service providers seeking an email encryption offering in an original equipment manufacturing (“OEM”)-like 
relationship. New first year orders (“NFYOs”), defined as the twelve month value of orders received from new customers, derived 
from our value-added resellers, OEM and third party distribution channels for 2015 were 64% of the total new first year orders 
compared to 58% in 2014. Google, Inc. continues to be our largest third party reseller representing approximately 7% of NFYOs in 
2015. Our new partnership with Cisco resulted in approximately 5% of 2015 NFYOs. We now have more than 250 value-added 
resellers and over 100 managed security service providers across the U.S. 

Employees 

We had 192 employees as of December 31, 2015. The majority of our employees are located in Dallas, Texas. We also have a 

sales office in Burlington, Massachusetts; and a smaller office located in Ottawa, Ontario, Canada. 

5 

Research and Development  

We incurred research and development expenses of $8.3 million, $9.1 million, and $9.6 million for the twelve-month periods 

ended December 31, 2015, 2014, and 2013, respectively. 

Over the course of 2015 we continued to make investments toward strengthening and expanding our service portfolio. We 
assumed design control of the Cisco IEA technology, upgraded much of its underpinning technology and security framework and 
delivered both a replacement for the legacy Cisco appliance and an integration of the Cisco Registered Envelope technologies into 
ZixGateway. ZixGateway and ZixDLP policy frameworks were also integrated to improve flexibility and processing speed.  

On the cloud services front, we added major features such as offline calendar and ZixGateway encryption access to ZixOne and 

converted critical components of the ZixPort service from Unix to Linux for security evolution, cost effectiveness and scaling 
purposes. We also added login credential sharing, compose flexibility and encryption key management enhancements. Improved user 
management, cloud provider integration and configuration automation were added to our ZixHosted service suite. 

In addition to the above, we broadened our access to the Google Apps Message Encryption marketplace specifically to handle 

smaller customers, and we upgraded our portfolio of desktop client offerings to align with Microsoft technology changes (Outlook 
2016, IMAP, etc.) and the evolution of various spam control mechanisms.  

The following are registered trademarks of ours and certain of our subsidiaries: “ZixCorp,” “ZixGateway,” “ZixDirectory,” 

ZixIt, “ZixPort,” and “PocketScript”. 

Intellectual Property 

We depend upon our ability to develop, maintain and protect our proprietary technology and our related intellectual property 

rights. We rely on a combination of patent, trademark, trade secret and copyright law and contractual restrictions to protect the 
proprietary aspects of our technology and related property rights and to defend against infringement and/or misappropriation claims 
from others. We own 25 U.S. patents (including U.S. pending patents) with expiration dates ranging from 2019 through 2026. We 
have a program to file applications for and obtain patents and trademarks in the United States and in specific foreign countries where 
we believe filing for such protection is appropriate. While intellectual property rights are generally important to our business, we do 
not believe that our business is dependent on any single item of intellectual property, or that any single item of intellectual property is 
material to the operation of our business. Rather, we believe that our intellectual property rights provide us with a competitive 
advantage, and from time to time we have taken steps to enforce our intellectual property rights as a means of protecting that 
competitive advantage. 

Please see generally the risks that are more fully disclosed in “Item 1A. Risk Factors” for risks related to our intellectual 

property.  

Compliance with Environmental Regulations 

We have not incurred, and do not expect to incur, any material expenditures or obligations related to environmental compliance 

issues. 

Governmental Contracts 

We have contracts with many local, state and federal agencies and regulators, which in the aggregate contribute approximately 6 

percent of our annual revenue. 

Significant Customers 

In each of 2015, 2014, and 2013, no single customer accounted for 10% or more of our total revenues. 

Backlog 

Our backlog is comprised of contractual commitments that we expect to recognize as revenue in the future. Our backlog was 

$74.2 million at December 31, 2015, compared to $69.3 million at December 31, 2014. 

As of December 31, 2015, our backlog is comprised of the following elements: $24.0 million of deferred revenue that has been 

billed and paid, $7.3 million billed but unpaid, and approximately $42.9 million of unbilled contracts. 

6 

The backlog is recognized into revenue ratably as the services are performed. Approximately 57% of our total backlog at 

December 31, 2015, is expected to be recognized as revenue during 2016. 

Seasonality 

The Company typically experiences lower NFYO’s in the first quarter of the calendar year. Our budget anticipates fewer 
NFYO’s in the first quarter, but historically this has not resulted in a material impact to our revenue or earnings on a seasonal basis. 

Geographic Information 

Our operations are primarily based in the U.S., with approximately 5% of our employees located in Canada. Except for a United 

Kingdom based data center, we do not operate in, or have dependencies on, any other foreign countries. Our revenues and orders to-
date are almost entirely sourced in the U.S. and all significant corporate assets at December 31, 2015, were located in the U.S. 

Financial Information About Industry Segments 

We have one reportable segment consisting of email encryption and security solutions. We internally evaluate all of our product 

offerings and other sources of revenue as one industry segment, and, accordingly, do not report segment information. 

Available Information 

Our Internet address is www.zixcorp.com. Our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports 
on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 
1934, as amended (the “Exchange Act”), are available on our website, without charge, as soon as reasonably practicable after we 
electronically file such material with, or furnish it to, the SEC. The information found on our website shall not be considered to be part 
of this or any other report filed with or furnished to the SEC. 

In addition to our website, you may read and copy any materials we file with the SEC at the SEC’s Public Reference Room at 
450 Fifth Street, N.W., Washington, D.C. 20549. You may obtain information on the operation of the SEC’s Public Reference Room 
by calling the SEC at 1-800-SEC-0330. The SEC maintains a website that contains reports, proxy and other information statements, 
and other information regarding issuers, including us, that file electronically with the SEC. The address of the website is www.sec.gov. 

NOTE ON FORWARD-LOOKING STATEMENTS AND RISK FACTORS 

This document contains “forward-looking statements” (including the discussion appearing under the caption “Liquidity 
Summary” in “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations,”) within the 
meaning of Section 27A of the Securities Act of 1933, as amended (the “Act”) and Section 21E of the Exchange Act. All statements 
other than statements of historical fact are “forward-looking statements” for purposes of federal and state securities laws, including: 
any projections of future business, market share, earnings, revenues, recognition of revenues from backlog, cash receipts, or other 
financial items; any statements of the plans, strategies, and objectives of management for future operations; any statements concerning 
proposed new products, services, or developments; any statements regarding future economic conditions or performance; any 
statements of belief; and any statements of assumptions underlying any of the foregoing. Forward-looking statements may, but need 
not, include words such as “may,” “will,” “predict,” “project,” “forecast,” “plan,” “should,” “could,” “goal,” “estimate,” “intend,” 
“continue,” “believe,” “expect,” “outlook,” “anticipate,” “hope,” and other similar expressions. Any forward-looking statements 
involve risks and uncertainties that could cause actual events or results to differ materially from the events or results described in the 
forward-looking statements, including, but not limited to, the risks and uncertainties described in the “Item 1A Risk Factors” section. 

Although we believe that expectations reflected in and the assumptions underlying our forward-looking statements are 

reasonable, actual results or assumptions made could differ materially from those projected or assumed in any of our forward-looking 
statements. Our future financial condition and results of operations, as well as any forward-looking statements, are subject to change 
and to inherent risks and uncertainties, including, but not limited to, those disclosed in this document. Forward-looking statements 
speak only as of the date on which they are made, and we do not intend, and undertake no obligation, to update any forward-looking 
statement. 

7 

Item 1A. Risk Factors 

The following is a cautionary discussion of risks, uncertainties and assumptions that we believe are significant to our business, 

financial condition and financial results. In addition to the factors discussed elsewhere in this Annual Report on Form 10-K, the 
following are some of the important factors that, individually or in the aggregate, we believe could make our results differ materially 
from those described in any forward-looking statements. It is impossible to predict or identify all such factors and, as a result, you 
should not consider the following factors to be a complete discussion of risks, uncertainties and assumptions. 

Our business depends upon customers using email to exchange confidential information, and a significant shift of those 
messages to other communication channels could impair our growth prospects and negatively affect our business, financial 
condition and financial results. 

Our customers deploy and use our products and services to easily, securely and confidentially send and receive email messages. 

Our business and revenue substantially depend on our current and potential customers using email to exchange sensitive information 
electronically. New technologies, products, or business models that could support secure communications could be disruptive to our 
business. If prospective or current customers were to send and receive sensitive information using technology or communication 
channels other than email, our growth prospects and our business, financial condition and financial results could be materially 
adversely affected. 

Our business substantially depends upon the continued growth of the internet and internet-based systems, including email. 

A substantial portion of our business and revenue depends on the growth and evolution of the Internet and internet-based 
systems, including email, as a primary medium for commerce, communication and business applications, and on the deployment of 
our products by customers who depend on such continued growth and evolution. To the extent that an economic slowdown or 
uncertainty and related reduction in capital spending adversely affect spending on Internet infrastructure, we could experience material 
harm to our business, operating results, and financial condition. 

Our business depends on market acceptance of our products and services, and our failure to achieve and maintain influential 
customers could negatively affect our business, financial condition and financial results. 

In order to continue to operate profitably and grow, we must achieve and maintain broad market acceptance of our products and 
services at a price that provides us with an acceptable rate of return relative to our costs. We have been successful in selling our Email 
Encryption products and services to high-profile customers in the healthcare, financial services and government segments of the 
market. The acceptance and use of our products and services by those significant customers facilitates our sales to other potential 
customers, and an expanding base of users in the Zix Directory aids in our market penetration and expansion. The loss of an influential 
customer of our existing products and services, or the failure to achieve sufficient market adoption of new products including ZixDLP 
and ZixOne, could impair our ability to expand the market penetration of our products and services, or cause us to reduce or increase 
prices, which could reduce our revenues and net income and materially adversely affect our business, financial condition and financial 
results. 

Our business relies on securing new customer subscriptions and subscription renewals from existing customers. 

A large portion of our revenue is derived from customer subscriptions, and existing customers have no contractual obligations to 

purchase beyond the initial subscription or contract period. We may not maintain historical subscription rates, and we may be unable 
to accurately predict our customer renewal rates. Although we have historically retained approximately 90% of our recurring revenue 
on an annual basis, our customers’ renewal rates may decline or fluctuate as a result of a number of factors, including the level of their 
satisfaction with our products and technical support services, customer merger or acquisition activity, customer budgets, the pricing of 
our products compared with those offered by our competitors, technology trends, the prevailing regulatory regime and general market 
conditions. If new subscriptions or subscription renewals decline, our revenue or revenue growth may decline, and our business may 
suffer. 

The security of our networks and data centers is critical to our business and an actual or perceived breach of security through 
a cyber-attack or otherwise could cause us to lose customers and could negatively affect our reputation, business, financial 
condition and financial results. 

We are dependent on our networks and data centers to provide our products and services. Due to the nature of the products and 

services we provide and the sensitive nature of the information we collect, process, store, use and transmit, we may face cyber-attacks, 
data protection breaches, computer viruses and other similar disruptions from unauthorized tampering or human error that attempt to 
penetrate and could harm our networks and data centers. Our business depends on customers having and maintaining confidence that 
we provide effective network and security protection. To reduce the risk of a successful cyber-attack or similar event, we have 

8 

 
implemented significant physical and logical security measures to detect, identify and mitigate threats as well as to monitor for and 
respond to potential breaches and incidents. Despite these security measures, our networks and data centers may remain vulnerable. 
We may not be able to correct a security flaw or particular vulnerability promptly, or at all.  Further efforts to limit the ability of 
malicious third parties to disrupt or undermine our security efforts may be costly to implement and may not be successful. If a cyber-
attack or other breach of security occurs, or is perceived to have occurred, in our internal systems or at our data centers and networks, 
it could cause negative publicity, interruption of our services, damage to our reputation, unauthorized disclosure of our customers’ 
confidential or proprietary information (including personally identifiable information), disclosure of our intellectual property, 
disclosure, modification or removal of our confidential or sensitive information, theft or unauthorized use or publication of our trade 
secrets, loss of customers, lost revenue and increased expense (including potentially indemnification or warranty costs), any of which 
could have a material adverse effect on our business, financial condition and financial results. 

Public key cryptography technology used in our businesses is subject to technology integrity risks that could reduce demand 
for our products and services and could negatively affect our business, financial condition and financial results. 

Our business employs public key cryptography technology and other encryption technologies to encrypt and decrypt messages. 

The security afforded by encryption depends on the integrity of the private key, which is predicated on the assumption that it is very 
difficult to mathematically derive the private key from the related public key. Successful decryption of intercepted encrypted email, or 
public reports of successful decryption, whether or not true, could reduce demand for our products and services. If new methods or 
technologies, such as quantum computing, make it easier to derive the private key from the related public key, the security of 
encryption services using public key cryptography technology could be impaired and our products and services could become less 
marketable. That could require us to make significant changes to our services, which could increase our costs, damage our reputation, 
or otherwise harm our business. Any of these events could reduce our revenues, increase our expenses and materially adversely affect 
our business, financial condition and financial results. 

Our business depends substantially on our data center facilities, and their unreliability or unavailability for a significant 
period could cause us to lose customers and could negatively affect our business, financial condition and financial results. 

Much of the computer and communications hardware upon which our businesses depend is located in our data center facilities 
in Dallas and Austin, Texas and in the United Kingdom. Our data centers might be damaged or interrupted by fire, flood, power loss, 
telecommunications failure, break-ins, cyber-attacks, earthquakes, terrorist attacks, hostilities or war or other events. Computer 
viruses, equipment failure, denial of service attacks, and similar disruptions affecting the internet or our systems might cause service 
interruptions, delays and loss of critical data, and could prevent us from providing our services. Problems affecting our data center 
operations or the networks on which we rely could result in loss of revenues, increased expenses, failure to achieve market acceptance, 
diversion of resources, injury to our reputation, liability and increased costs. We do not carry sufficient insurance to compensate us for 
all losses that may occur as a result of any of these events. The occurrence of any of these events could materially adversely affect our 
business, financial condition and financial results. 

Outages or problems with systems and infrastructure supplied by third parties could negatively affect our business, financial 
condition and financial results. 

Our business relies on third-party suppliers of the telecommunications infrastructure. We use various communications service 
suppliers and the global internet to provide network access between our data centers, our customers and end-users of our services. If 
those suppliers do not enable us to provide our customers with reliable, real-time access to our systems, we may be unable to gain or 
retain customers. These suppliers periodically experience outages or other operational problems as a result of internal system failures 
or external third party actions. Though our products generally tolerate isolated supplier failures, multiple supplier outages or problems 
could materially adversely affect our business, financial condition and financial results. 

The infrastructure supporting our business may suffer capacity constraints and business interruptions that could cause us to 
lose customers, increase our operating costs and could negatively affect our business, financial condition and financial results.  

Our business depends on our providing our customers reliable, real-time access to our data centers and networks. Customers will 

not tolerate a service hampered by slow delivery times, unreliable service levels, service outages, or insufficient capacity. System 
capacity limits or constraints arising from unexpected increases in our volume of business or network traffic could cause interruptions, 
outages or delays in our services, or deterioration in their performance, or could impair our ability to process transactions. We may not 
be able to accurately project the rate of increase in usage of our systems or to timely increase capacity to accommodate increased 
traffic on our systems. System delays or interruptions may prevent us from efficiently providing services to our customers or other 
third parties, which could result in our losing customers and revenues, or incurring liabilities that could have a material adverse effect 
on our business, financial condition and financial results. 

9 

The growth of our business may require significant investment in systems and infrastructure and these investments may 
achieve delayed, or lower than expected benefits, which could impair our profitability and negatively affect our business, 
financial condition and financial results. 

As our operations grow in size and scope, we continually need to improve and upgrade our technology offerings, systems and 
infrastructure to offer an increasing number of customers enhanced products, services, features and functionality, while maintaining 
the reliability and integrity of our systems and infrastructure and pursuing reduced costs per transaction. Expanding our technology 
offerings, systems and infrastructure may require us to commit substantial financial, operational and technical resources, with no 
assurance that the volume of our business will increase, which could reduce our net income, deplete our cash, and materially adversely 
affect our business, financial condition and financial results. Developing and launching new product offerings adjacent to or outside of 
our core encrypted email offerings can be particularly costly in terms of capital investments for both product development and 
marketing. At the same time, these new offerings involve greater uncertainty concerning both market acceptance and our ability to 
successfully execute a sales and marketing strategy that justifies our investments. Our failure to properly manage and execute new 
product initiatives could materially adversely affect our business, financial condition and financial results. 

Our failure to keep pace with rapid technology changes could have a negative impact on our business, financial condition and 
financial results. 

The markets for our products and services are characterized by rapid technological developments and frequent changes in 

customer requirements. We must continually improve the performance, features and reliability of our products and services, 
particularly in response to competitive offerings, to keep pace with these developments. We must ensure that our products and 
services address evolving operating environments, devices, industry trends, certifications and standards. For example, we have been 
required to expand our offerings for virtual computer environments and mobile environments to support a broader range of mobile 
devices. We also may need to develop products that are compatible with new operating systems while remaining compatible with 
existing, popular operating systems. Our business could be harmed by our competitors announcing or introducing new products and 
services that could be perceived by customers as superior to ours. We spend considerable resources on technology research and 
development, but our research and development resources are more limited than many of our competitors. Our failure to introduce 
new or enhanced products on a timely basis, to keep pace with rapid industry, technological or market changes or to gain customer 
acceptance for our new and existing products and services, such as mobile device data protection, could have a material adverse effect 
on our business, financial condition and financial results. 

We face strong competition, which could negatively affect our business, financial condition and financial results. 

The markets in which we compete are characterized by rapid change and converging technologies and are very competitive. 

With rising demand for private and secure email communications, there is strong competition for email encryption products and 
services. Our Email Encryption and data loss prevention business competes with products and services offered by companies such as 
Microsoft, Barracuda Networks, Inc., Proofpoint, and Sophos Inc. Our ZixOne business completes with products and services offered 
by companies such as AirWatch/VMWare, Citrix (with XenMobile), Good Technology (purchased by Blackberry), IBM/Fiberlink 
(with MaaS360), Microsoft (with ActiveSync), and MobileIron. Strong competition requires us to develop new technology solutions 
and service offerings to expand the functionality and value that we offer to our customers. Many of our competitors bundle their 
competing products and services with products and services that we do not offer, which could make our offerings less attractive by 
comparison. As a result of the bundling by these competitors, it can be difficult for our customers to compare the cost of our offerings 
with competing offerings. In some instances, competing products and services may seem to be offered by our competitors at little to 
no additional cost to the customer. In addition, our competitors may develop products and services that are perceived by customers as 
equivalent to, or having advantages over, our products and services. Competitors could capture a significant share in our markets, 
causing our sales and revenue to decline or grow more slowly. Barriers to entry are relatively low, and new ventures are often formed 
that create products competitive with our products. Competitive pressures could lead to price discounting or to increases in expenses 
such as advertising and marketing costs. Increased competition could also decrease demand for our products and services. 
Competition could reduce our revenues and net income and materially adversely affect our business, financial condition and financial 
results. 

Industry consolidation may lead to increased competition and may harm our operating results. 

There has been a trend toward industry consolidation in our industry for several years. We expect this trend to continue as 
companies attempt to strengthen or hold their market positions in an evolving industry and as companies are acquired or are unable to 
continue operations. For example, some of our current and potential competitors have made acquisitions, or announced new strategic 
alliances. Companies that are strategic alliance partners in some areas of our business may acquire or form alliances with our 
competitors, thereby reducing their business with us. We believe that industry consolidation may result in stronger competitors that are 
better able to compete as sole-source vendors for customers. This could have a material adverse effect on our business, financial 
condition and financial results. 

10 

Some competitors have advantages that may allow them to compete more effectively than us, which could negatively affect our 
business, financial condition and financial results. 

Some of our competitors have longer operating histories, more extensive operations, greater name recognition, larger technical 

staffs, bigger product development and acquisition budgets, established relationships with more distributors and hardware vendors, 
and greater financial and marketing resources than we do. These advantages might enable them (independently or through alliances) to 
develop and expand functionality of products and services faster than we can, to spend more money to market and distribute products 
and services than we can, or to offer their products and services at prices lower than ours. These advantages could reduce our revenues 
and net income and materially adversely affect our business, financial condition and financial results. 

If we do not successfully manage our strategic alliances, we may not realize the expected benefits from such alliances and we 
may experience increased competition or delays in product development. 

We have entered into several strategic alliances with other companies to offer complementary products and services. These 

arrangements are generally limited to specific projects or series of projects, and their main goal is generally to facilitate product 
compatibility and adoption of industry standards. There can be no assurance that we will realize the expected benefits from these 
strategic alliances. If successful, these relationships may be mutually beneficial and result in industry growth. However, alliances 
carry an element of risk because, in most cases, we must compete in some business areas with a company with which we have a 
strategic alliance and, at the same time, cooperate with that company in other business areas. Also, if these partner companies fail to 
perform or if these relationships fail to materialize as expected, we could suffer delays in product development or other operational 
difficulties.  

We increasingly rely on third party distributors to market our products and services, and our failure to succeed in those 
relationships could negatively affect our business, financial condition and financial results. 

We distribute an increasing percentage of our products and services by entering into alliances with third parties who can offer 

our products and services along with their own or our competitors’ products and services. Increased reliance on third parties to market 
and distribute our products and services exposes us to a variety of risks. For example, we have limited control over and visibility into 
the sales cycles of third party distributors, which could increase the length of our sales cycle, cause our revenue to fluctuate 
unpredictably and make it difficult to accurately forecast our revenue. In addition, we may not succeed in developing or maintaining 
marketing alliances. Companies with which we have marketing alliances may in the future discontinue their relationships with us, 
form marketing alliances with our competitors, or develop and market their own products and services that compete with ours. If a 
significant distributor were to discontinue its relationship with us, we could experience an interruption in the distribution of our 
products and services and our revenues could decline. Our failure to develop, maintain and expand strategic distribution relationships 
could reduce our revenues and net income and materially adversely affect our business, financial condition and financial results. 

Unfavorable economic environments, particularly in the U.S., could negatively affect our business, financial condition and 
financial results. 

Challenging economic conditions worldwide have from time to time contributed, and may continue to contribute, to slowdowns 
in the technology and networking industries at large, as well as in the encrypted email/data security market and in specific geographic 
markets in which we operate. If economic growth in those markets, particularly in the U.S., which accounts for a substantial majority 
of our revenue, slows, or credit is unavailable at a reasonable cost, current and potential customers may delay or reduce technology 
purchases, including the deployment or expansion of our products and services. This could result in reduced sales of our products and 
services, longer sales cycles, slower adoption of new technologies and increased price competition. In addition, adverse economic 
conditions could negatively affect the cash flow of our customers and distributors, which might result in failures or delays in payments 
to us. This could increase our credit risk exposure and delay our recognition of revenue. Specific economic trends, such as declines in 
the demand for cloud computing services and computing devices, or softness in corporate information technology spending, could 
have a more direct impact on our business. If these conditions persist, spread or deteriorate further, our business, financial condition 
and financial results could be materially adversely affected. 

If our products do not work properly, our reputation, business, financial condition and financial results could be negatively 
affected and we could experience negative publicity, declining sales and legal liability. 

The threats facing our customers are constantly evolving and the techniques used by experienced hackers to access or sabotage 
data change frequently, often are not recognized until launched against a target, and may originate from less regulated or remote areas 
around the world.  As a result, we must constantly update our product solutions to respond to these threats.  We produce complex 
solutions that incorporate leading-edge technology, including both hardware and software, that must operate in a wide variety of 
technology environments. Software may contain defects or “bugs” that can interfere with expected operations. There can be no 
assurance that our testing programs will be adequate to detect all defects prior to the product being introduced, which might decrease 

11 

customer satisfaction with our products and services. The product reengineering cost to remedy a product defect could be material to 
our operating results. Our inability to cure a product defect could result in the temporary or permanent withdrawal of a product or 
service from the market, a security breach, negative publicity, damage to our reputation, failure to achieve market acceptance, lost 
revenue and increased expense, any of which could have a material adverse effect on our reputation, business, financial condition and 
financial results. 

Our usage of personal information, and inadvertent exposure of confidential or personal information, could cause us to violate 
data privacy laws or lose customers and could negatively affect our business, financial condition and financial results. 

We transmit and store large amounts of personally identifiable information about individuals, which may include healthcare or 

financial information. Although we have established, and continue to develop and enhance, security measures and controls to help 
protect against unauthorized disclosure of such personal data information, an inadvertent disclosure of, or unauthorized third-party 
access to, personal data, could disrupt our operations, damage our reputation and subject us to claims or other liabilities. 

In addition, our processing and storage of these types of personal data is subject to confidentiality agreements with our clients 
and handling this data is increasingly subject to privacy and data security regulation around the world, such as the European Union’s 
Data Protection Directive. Such laws and regulations are subject to new and differing interpretations and may be inconsistent among 
jurisdictions. For example, the European Court of Justice recently invalidated the U.S.-EU Safe Harbor framework that had been in 
place since 2000, which allowed companies to meet certain European legal requirements for the transfer of personal data from the 
European Economic Area to the United States. While other adequate legal mechanisms to lawfully transfer such data remain, the 
invalidation of the U.S.-EU Safe Harbor Framework may result in different European data protection regulators applying differing 
standards for the transfer of personal data. Change in requirements under these regulations may be inconsistent with our existing data 
management practices. If so, we could be required to fundamentally change our business activities and practices or modify our 
software, which could have an adverse effect on our business, including increased cost of compliance and limitations on data transfer 
for us and our customers. 

Any inability to adequately address privacy concerns, even if unfounded, or to comply with applicable privacy or data protection 

laws, regulations and policies, could result in additional costs and liability to us, damage our reputation, inhibit sales and harm our 
business. Furthermore, any inadvertent disclosure of, or unauthorized access (including due to a cyber-attack) to, personal data or 
other confidential information or other failure by us to comply with data privacy requirements could subject us to significant penalties, 
damages, remediation and other expenses, and damage our reputation, any of which could have a material adverse effect on our 
business, financial condition and financial results. 

Problems with enforcing our intellectual property rights or using third party intellectual property could negatively affect our 
business, financial condition and financial results. 

We rely on a combination of contractual rights, trademarks, trade secrets, patents and copyrights to establish and protect 
intellectual property rights and other proprietary rights in our products and services. These intellectual property rights or other 
proprietary rights might be challenged, invalidated or circumvented. The steps we have taken to protect our proprietary information 
may not prevent its misuse, theft or misappropriation. Competitors may independently develop technologies or products that are 
substantially equivalent or superior to our products or that inappropriately incorporate our intellectual property rights or other 
proprietary technology into their products. Competitors may hire our former employees who may misappropriate our intellectual 
property rights or other proprietary technology. Some jurisdictions may not provide adequate legal protection of our intellectual 
property rights or other proprietary technology. 

We may have to defend or assert our rights in intellectual property that we use in our services, and we could be found to 
infringe the intellectual property rights of others, which could be disruptive and expensive to our business. 

We may have to defend against claims that we or our customers are infringing the rights of third parties in patents, copyrights, 

trademarks and other intellectual property. If we acquire technology to include in our products from third parties, our exposure to 
infringement actions may increase because we must rely upon these third parties to verify the origin and ownership of such 
technology. Also, we may be required to spend significant resources to monitor and protect our intellectual property rights, including 
initiating claims or litigation against third parties for infringement or misappropriation. Intellectual property litigation and 
controversies are disruptive and expensive, whether or not resolved in our favor. Even unmeritorious claims brought against us or our 
customers may harm our reputation and customer relationships, may cause us to incur significant legal and other fees to defend, and 
may have to be settled for significant amounts. Infringement claims against us could require us to develop non-infringing services or 
enter into expensive royalty or licensing arrangements. Our business, financial condition and financial results could be materially 
adversely affected if we are not able to develop non-infringing technology or license technology on commercially reasonable terms. 

12 

We may face risks from using “open source” software that could negatively affect our business, financial condition and 
financial results. 

Like many other software companies, we use “open source” software in order to take advantage of common industry building 
blocks and to add functionality to our products quickly and inexpensively. Open source software license terms could adversely affect 
our intellectual property rights in our products that include open source software. Depending upon how the open source software is 
deployed, we could be required to offer products that use the open source software for no cost, or make available the source code for 
modifications or derivative works. Any of these obligations could have an adverse impact on our intellectual property rights and 
revenue from products incorporating the open source software. Using open source code could also cause us to inadvertently infringe 
third-party intellectual property rights or require us to publicly disclose proprietary information. We have processes and controls in 
place that are designed to address these risks and concerns, but we cannot be sure that our process or controls will be sufficient to 
mitigate all risk in this regard. 

We rely on the availability of third-party intellectual property, which may not be accessible to us on reasonable terms or at all.  

Some of our products include third party intellectual property, which may require licenses from third parties. Based on past 

experience and industry practice, we believe that such licenses can be obtained on reasonable terms; however, there can be no 
assurance that we will be able to obtain the necessary licenses for new or current products on acceptable terms or at all.   Failure to 
obtain such licenses may limit our ability to sell our products, which could have a material adverse effect on our business, financial 
condition and financial results.    

We may fail to recruit and retain key personnel, which could impair our ability to meet key objectives. 

Our success depends on our ability to attract and retain highly-skilled technical, managerial, sales, and marketing personnel. 

Changes in key personnel may be disruptive to our business. It could be difficult, time consuming and expensive to replace key 
personnel. Integrating new key personnel may be difficult and costly. Volatility, lack of positive performance in our stock price or 
changes to our overall compensation program including our stock incentive program may adversely affect our ability to retain key 
employees, many of whom are compensated, in part, based on the performance of our stock price. The loss of services of any of our 
key personnel, the inability to retain and attract qualified personnel in the future or delays in hiring required personnel could make it 
difficult to meet key objectives. Any of these impairments related to our key personnel could negatively affect our business, financial 
condition and financial results. 

Governmental restrictions on the sale of our products and services in non-U.S. markets could negatively affect our business, 
financial condition and financial results. 

Exports of software solutions and services using encryption technology such as ours are generally restricted by the U.S. 

government. Although we have obtained U.S. government approval to export our service to almost all countries, the list of countries to 
which we (and our distributors) cannot export our products and services could be expanded in the future. In addition, some countries 
impose restrictions on the importation and use of encryption solutions and services such as ours. The cost of compliance with U.S. and 
other export laws, or our failure to obtain governmental approvals to offer our products and services in non-U.S. markets, could affect 
our ability to sell our products and services and could impair our international expansion. We face a variety of other legal and 
compliance risks. If we or our distributors fail to comply with applicable law and regulations, we may become subject to penalties, 
fines or restrictions that could materially adversely affect our business, financial condition and financial results. 

Exercises and vesting of equity awards relating to our common stock may dilute the ownership interests of existing 
shareholders and could negatively affect the value of our common stock. 

Our employees hold a significant number of outstanding options and other equity awards. The vesting and exercise of these 

awards, and the resulting issuance of additional shares of our common stock, dilutes the ownership interests and voting rights of our 
current shareholders. Issuances and/or sales of those additional shares could cause our common stock to decline in value. In recent 
years, we have completed several share repurchase programs, the effect of which has been to mitigate the dilutive effect of our 
employee equity grants.  There can be no assurance, however, that we will continue these share repurchase programs in the future. 

Item 1B. Unresolved Staff Comments 

None. 

13 

 
Item 2. Properties 

We leased properties during 2015 that are considered significant to the operations of the business in the following locations: 

Burlington, Massachusetts; Ottawa, Ontario, Canada; the United Kingdom; and Dallas and Austin, Texas. Our Burlington employees 
perform sales and marketing activities. Our Ottawa employees perform both client services and sales support activities. The United 
Kingdom facility provides data center support for our European customers. The Dallas office is our headquarters, which includes 
research and development, marketing, sales and all general administrative services, and the ZixData Center. Our Austin location is 
used primarily for fail-over and business continuity services and is used to some extent to support normal ongoing operations. Our 
facilities are suitable for our current needs and are considered adequate to support expected near term growth. 

Item 3. Legal Proceedings 

We are subject to legal proceedings, claims, and litigation involving our business. While the outcome of these matters is 
currently not determinable, and the costs and expenses of resolving these matters may be significant, we currently do not expect that 
the ultimate costs to resolve these matters will have a material adverse effect on our consolidated financial statements. 

Item 4. Mine Safety Disclosures 

Not applicable. 

14 

 
 
Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities 

Our common stock trades on The Nasdaq Stock Market under the symbol ZIXI. The table below shows the high and low sales 

prices by quarter for fiscal 2015 and 2014. 

PART II 

Quarter Ended 
March 31 
June 30 
September 30 
December 31 

2015 

2014 

High 

Low 

High 

Low 

  $
  $
  $
  $

4.41    $
5.47    $
5.40    $
5.78    $

3.31    $ 
3.88    $ 
3.98    $ 
4.12    $ 

4.94     $
4.27     $
4.08     $
3.83     $

3.88 
3.10 
2.90 
3.03  

At March 8, 2016, there were 56,158,434 shares of common stock outstanding held by 400 shareholders of record. On that date, 

the last reported sales price of the common stock was $4.09. 

We have not paid any cash dividends on our common stock and do not anticipate doing so in the foreseeable future. 

For information regarding options and stock-based compensation awards outstanding and available for future grants, see 

“Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.” 

Performance Graph 

The following graph compares the cumulative total return of an investment in our common stock over the five-year period 
ended December 31, 2015, as compared with the cumulative total return of an investment in (i) the Center for Research in Securities 
Prices (“CRSP”) Total Return Index for Nasdaq Stock Market (U.S. companies) and (ii) the CRSP Total Return Index for Nasdaq 
Computer and Data Processing Stocks. The comparison assumes $100 was invested on December 31, 2010, in our common stock and 
in each of the two indices and assumes reinvestment of all dividends, if any. The stock price performance on the following graph is 
not necessarily indicative of future stock price performance. A listing of the companies comprising each of the CRSP- NASDAQ 
indices used in the following graph is available, without charge, upon written request. 

Comparison of 5 Year Cumulative Total Return
Assumes Initial Investment of $100
December 2015

250.00

200.00

150.00

100.00

50.00

0.00

2010

2011

2012

2013

2014

2015

Zix Corp.

NASDAQ Stock Market (US Companies)

NASDAQ Computer and Data Processing Index

Sale of Unregistered Securities 

None. 

15 

  
  
 
 
  
 
 
 
 
 
  
    
 
  
  
 
Purchases of Equity Securities by the Issuer 

Period 

October 1, 2015 to October 31, 2015 
November 1, 2015 to November 30, 2015 
December 1, 2015 to December 31, 2015 
Total 

Total Number of 
Shares Purchased

Average Price
Paid per Share

Total Number of Shares(cid:3)
Purchased as part of 
Publically Announced 
Plans or Programs (1)  (cid:3) 

Maximum Number (or
Appropriate Dollar 
Value) of Shares (or 
Units) that May Yet Be
Purchased Under the
Plans or Programs

683,470 $
— $
— $
683,470 $

4.39  
—  
—  
4.39  

683,470   $ 
—   $ 
—   $ 
683,470   $ 

—
—
—
—  

1 The shares were repurchased under the $15 million stock repurchase program approved by our board of directors May 11, 2015. The 
October activity completed the program, which expired on October 31, 2015. No shares were purchased other than through publicly 
announced programs during the periods shown. 

Item 6. Selected Financial Data 

The following selected financial data should be read in conjunction with “Item 7. Management’s Discussion and Analysis of 

Financial Condition and Results of Operations,” the consolidated financial statements and notes thereto. No cash dividends were 
declared in any of the five years shown below: 

Statement of Operations Data: 
Revenues 
Cost of revenue 
Gross margin 
Research and development expenses 
Selling, general and administrative expenses 
Income tax expense (benefit)(1)(cid:3)
Net Income 
Basic income per common share 
Diluted income per common share 
Shares used in computing basic income per common share 
Shares used in computing diluted income per common 
   share 
Statements of Cash Flows Data: 
Net cash flows provided by (used for): 
Operating activities 
Investing activities 
Financing activities 
Balance Sheet Data: 
Cash, Cash Equivalents and Marketable Securities 
Working capital(2)(cid:3)
Total assets 
Stockholders’ equity 

$

$
$

$

$

2015 

Year Ended December 31, 
2013 

2012 

2014 

2011 

(In thousands, except per share data) 

54,713    $
9,593     
45,120     
8,317     
28,887     
3,144     
5,016     
0.09    $
0.09    $
56,422     

50,347    $
8,324     
42,023     
9,051     
26,222     
2,830     
4,103     
0.07    $
0.07    $
57,949     

48,138     $ 
7,614       
40,524       
9,563       
21,646       
(1,006 )     
10,453       
0.17     $ 
0.17     $ 
61,139       

43,356    $
7,609     
35,747     
7,419     
19,385     
(1,949)    
11,003     
0.18    $
0.17    $
62,211     

38,145 
7,211 
30,934 
5,229 
15,128 
(11,889)
22,554 
0.34 
0.34 
65,439 

57,476     

58,967     

62,527       

62,875     

67,262 

15,617    $
(1,951)    
(6,687)    

13,317    $
(3,402)    
(15,748)    

13,298     $ 
(1,593 )     
(7,175 )     

12,533    $
(1,533)    
(8,692)    

13,219 
(1,471)
(15,687)

28,664    $
3,821     
87,286     
56,772     

21,685    $
2,249     
83,724     
56,270     

27,518     $ 
12,127       
90,702       
66,234       

22,988    $
6,626     
82,849     
61,245     

20,680 
5,497 
77,552 
57,757   

(1)  The $1.0 million, $1.9 million, and $11.9 million tax benefits in 2013, 2012, and 2011 resulted from the release of a portion of 

our deferred tax asset valuation allowance. Based on analysis of both projected and current earnings excluding discontinued 
operations, we have estimated these tax assets as likely to be utilized prior to expiration. See “Income Taxes” in “Item 7. 
Management’s Discussion and Analysis of Financial Condition and Results of Operations.” 

(2)  Working capital includes deferred revenue totaling $23.2 million, $21.6 million, $19.1 million, $17.5 million, and $16.6 million 

as of December 31, 2015, 2014, 2013, 2012, and 2011, respectively. 

16 

  
 
 
 
 
 
  
  
 
 
  
 
   
   
     
   
 
  
 
     
  
 
 
     
     
       
     
 
 
 
 
 
 
 
 
 
 
     
     
       
     
 
 
     
     
       
     
 
 
 
 
     
     
       
     
 
 
 
 
  
 
 
 
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations 

The following discussion and analysis contains forward-looking statements about trends, uncertainties and our plans and 

expectations of what may happen in the future. Forward-looking statements involve risks and uncertainties that could cause actual 
events or results to differ materially from the events or results described in the forward-looking statements, including risks and 
uncertainties described above in “Item 1A. Risk Factors.” Readers are cautioned not to place undue reliance on forward-looking 
statements. The forward-looking statements are based upon information available to us on the date of this report. We undertake no 
obligation to publicly update or revise any forward-looking statements. See “Item 1. NOTE ON FORWARD-LOOKINGS 
STATEMENTS AND RISK FACTORS.” 

The following discussion should be read in conjunction with the consolidated financial statements and related notes beginning 

on page F-1. 

Overview 

We are a leader in providing secure email encryption. We provide email encryption, DLP and BYOD solutions to meet the data 
protection and compliance needs of organizations primarily in the healthcare, finance, and government sectors. A core competency is 
our ability to deliver this complex service offering with a high level of availability, reliability, integrity and security. 

Our 2015 results included record revenues. We attribute our success to on-going efforts to build a solid and predictable business 
based on our successful recurring revenue subscription business model. For 2015, we continued to benefit from growing concerns for 
data security and integrity issues, which continue to make headline news, as well as the growing acceptance of cloud-based offerings 
along with the growing need for regulatory compliance. 

For 2015, we reported revenue of $54.7 million, an increase of $4.4 million over the prior year, driven principally by continued 

growth in our Email Encryption business.    

For the year ended December 31, 2015, our gross profit of $45.1 million increased 7% compared to 2014. This increase was 
primarily driven by increased revenue. Our 2015 operating income of $7.9 million increased $1.2 million over the prior year, as the 
gross profit increase was offset by increased general and administrative expense related to our CEO transition and other legal fees. 

Our $5.0 million net income in 2015 is an increase of 22% compared to our $4.1 million net income in 2014.  

Other Financial Highlights 

(cid:120) 

(cid:120) 

(cid:120) 

Backlog was $74.2 million at the end of 2015, compared with $69.3 million at the end of 2014 

Total orders for 2015 were $61.0 million, an increase of 10% from the 2014 total orders of $55.4 million 

Our deferred revenue at the end of 2015 was $24.0 million, compared with $22.5 million at the end of 2014 

(cid:120)  We generated cash flows from operations of $15.6 million during fiscal 2015. Our cash and cash equivalents were $28.7 

million at the end of 2015, compared with $21.7 million at the end of 2014. 

(cid:120) 

Our shared, cloud-based ZixDirectory now has approximately 49 million members including some of the most respected 
institutions in the country. 

Our services are sold on a subscription basis with contract terms generally ranging from one to five years. We provide a 
financial incentive to our customers and sales force to contract for three to five years. Historically, most of our customers contract for 
three year terms, except for our large partner (i.e., “OEM”) orders which for the most part contain one year terms. At the end of the 
contract term we attempt to renew the subscription, again attempting to secure a three to five year term. Our customers pay us 
annually at the start of the subscription term and each succeeding year on the anniversary of the commencement of the service. We 
recognize revenue ratably on a monthly basis over the term of the subscription once service commences. 

We attempt to grow the business by signing new customers to subscription services and/or selling new or higher volume 

services to existing customers (i.e., “upsell”) while retaining existing customers through renewal of their services. 

Our total orders consist of orders from new customers, upsell to existing customers, plus renewal orders. Total orders may vary 

from quarter to quarter due to the timing of renewal orders, which will fluctuate in amount due to timing and length of expiring 
subscription terms. Similarly, total new orders and upsell orders will fluctuate in amount due to term length. 

17 

To better understand new orders, management tracks the first year value of new orders as well as the total order value for the 

subscription term because total order value will exceed the first year value on multi-year orders. By segregating the first year value of 
new orders, we eliminate the fluctuation in total order amount caused by the dollar impact of multi-year contracts. We refer to this 
metric as New First Year Orders (“NFYOs”). 

Our backlog consists of the total order value of contracted business that has not yet been recognized into revenue. Backlog is 
calculated by adding to the existing contracted order value the total value of all orders booked in the period (e.g., quarterly) less the 
value of revenue recognized for that period. Although orders are non-cancellable, occasionally we adjust backlog for customer 
bankruptcy or change of term, but these instances are rare and do not materially impact the backlog amount. The backlog will grow if 
the value of total orders added in a period exceeds the value of revenue recognized in that period. Conversely, the backlog amount will 
decline if revenue recognized exceeds the total order value added for the period. Although rare, a decline in backlog may result from 
fluctuations in total orders caused by timing of renewal orders described above. 

We retain approximately 90% of our recurring revenue on an annual basis. We calculate this percentage by identifying the 
current period revenue less revenue associated with orders for new services received in the prior twelve month period and comparing 
this amount to the total revenue in the corresponding prior year period. Deferred revenue is the value of contracted business that has 
been paid but has not been recognized as revenue. See description of the components of the backlog following in Item 7 of this Form 
10-K under the heading, “Backlog and Orders.” 

Our revenue growth is dependent on our ability to sell subscription services to new customers, upsell new services or increase 
volume with existing customers and retain existing customers by renewing their subscription services. Generally, if annual NFYOs 
exceed the annual value of cancelled subscriptions, revenue should grow. However, revenue growth may fluctuate due to timing of 
deployment of new services and subscription cancellations. For example, a new order reported in NFYOs in one quarter may not be 
deployed to the customer until the following quarter and therefore delay commencement of revenue recognition. Similarly, a 
cancellation of a contract with an expiration in the first month of a quarter will have a higher negative impact on revenue in the quarter 
than a contract of the same amount with an expiration in the last month of a quarter. The impact of these quarter to quarter fluctuations 
tends to diminish over annual periods making year over year quarterly revenue comparisons more indicative of revenue growth than 
sequential quarterly revenue comparisons. 

Our operations and future prospects are further discussed throughout this “Management’s Discussion and Analysis of Financial 

Condition and Results of Operations” (“MD&A”). 

There are no assurances we will be successful in our efforts to achieve continued growth. Our continued growth depends on the 

timely development and market acceptance of our products and services. See “Item 1A. Risk Factors” for more information on the 
risks relative to our operations and future prospects. 

Revenue 

Revenue increased by 9% in 2015 compared with 2014. Our revenue growth was driven by our successful subscription model 

that continues to yield steady additions to the subscriber base coupled with a high rate of renewing existing customers. Revenue 
growth slowed in 2014 in part due to lower orders from our largest OEM partner, Google. Google transitioned to a new ordering 
platform, Google Apps Message Encryption in 2013. This transition was completed in the fourth quarter of 2014. We began to see a 
pickup in Google order volume in 2015 and expect to see continued revenue improvement from Google orders in 2016. 

Critical Accounting Policies and Estimates 

In preparing our consolidated financial statements, we make estimates, assumptions and judgments that can have a significant 
impact on revenue, income from operations and net income, as well as the value of certain assets and liabilities on our consolidated 
balance sheet. The application of our critical accounting policies requires an evaluation of a number of complex criteria and significant 
accounting judgements by us. Management bases its estimates on historical experience and on various other assumptions that are 
believed to be reasonable under the circumstances, the results of which form the basis for making judgements about the carrying 
values of assets and liabilities. We evaluate our estimates on a regular basis and make changes accordingly. Senior management has 
discussed the development, selection and disclosure of these estimates with the Audit Committee of our Board of Directors. Actual 
results may materially differ from these estimates under different assumptions or conditions. If actual results were to differ from these 
estimates materially, the resulting changes could have a material adverse effect on our consolidated financial statements. 

18 

We consider accounting policies to be critical when they require us to make assumptions about matters that are highly uncertain 

at the time the accounting estimate is made and when different estimates that our management reasonably has used have a material 
effect on the presentation of our financial condition, changes in financial condition or results of operations. Management believes the 
following critical accounting policies reflect our more significant estimates and assumptions used in the preparation of the 
consolidated financial statements. 

Our critical accounting policies included the following: 

(cid:120) 

(cid:120) 

(cid:120) 

(cid:120) 

Revenue recognition 

Income taxes 

Valuation of goodwill and other intangible assets 

Stock-based compensation costs 

For additional discussion of the Company’s significant accounting policies, refer to Note 2 to our consolidated financial 

statements. 

Revenue Recognition 

We develop, market, and support applications that connect, protect and deliver information in a secure manner. We derive our 
revenue from subscription fees for rights related to the use of our software. Software subscription terms typically range from one to 
three years.  

Revenue is recognized when all of the following have been met: 

(cid:120) 

(cid:120) 

(cid:120) 

(cid:120) 

persuasive evidence of an arrangement exists, 

delivery has occurred or services have been rendered, 

the price is fixed and determinable, and 

collectability is probable. 

Discounts provided to customers are recorded as reductions in revenue. 

We have determined that substantially all of our revenue arrangements are in the scope of the software revenue recognition 

rules. Multiple elements in our software arrangements are sold as a single unit consisting of the following elements: (i) subscription 
licensed software delivered to the customer’s site, (ii) ongoing customer support and, (iii) access to our hosted encryption network 
(Zix encryption network) during the term of the agreement. 

(i) 

Software at the customer site performs critical functions of the email encryption process and is the predominant element in 
our arrangements. Actions performed by the software at the customer site include identifying when encryption is needed 
through the use of filters and lexicons, determining the best method of delivery (BMOD) by examining secure connection 
options and selecting the BMOD. BMOD is a key marketing differentiator for us and is defined as the most secure and 
easiest method to deliver encrypted email. Customers can install the software on their own hardware or we can deliver to 
the customer site hardware that we own. 

(ii)  Customer support includes unspecified software upgrades, updates and bug fixes and access to live technical support 

technicians and on-line knowledge resources 

(iii)  The Zix encryption network includes access to our central network which facilitates transparent encrypted email exchange 
among all of our customers by providing public encryption keys (asymmetrical encryption requires two keys- a public key 
provided by the central network and a private key generated by the software at the customer site). The delivered software 
element is essential to the functionality and utility of this central network. The network also enables our customers to send 
encrypted emails to non-Zix customer recipients through a portal. 

A small portion of our revenue (less than 5% in 2015) is derived from hosted email encryption solutions. We apply general 

revenue recognition guidance to these hosted arrangements.  

In all revenue arrangements we cannot determine vendor specific objective evidence (VSOE) and we cannot establish separate 
units of accounting for the multiple elements of our arrangements that are bundled and sold as one unit. All revenue arrangements are 
sales of subscription based (i.e. time-based) licenses. We defer revenue until the software is delivered and the service is deployed. 

19 

Upon deployment, we commence revenue recognition and revenue is recognized ratably over the subscription period generally 
ranging from one to three years.  

Income Taxes 

Deferred tax assets are recognized if it is “more likely than not” that the benefit of the deferred tax asset will be realized on 
future federal or state income tax returns. At December 31, 2015, we provided a valuation allowance against a significant portion, 
$46.1 million, of our accumulated U.S. deferred tax assets. This significant valuation allowance reflects our historical losses and the 
uncertainty of future taxable income sufficient to utilize net operating loss carryforwards prior to their expiration. Our total deferred 
tax asset not subject to a valuation allowance is valued at $48.9 million, and consists of $41.8 million for federal net operating loss 
carryforwards, $4.1 million relating to temporary timing differences between U.S. generally accepted accounting principles (“GAAP”) 
and tax-related expense, $1.8 million relating to U.S. state income tax credits, and $1.2 million related to Alternative Minimum Tax 
credits. If U.S. taxable income increases from its current level in a future period or if the facts and circumstances on which our 
estimates and assumptions are based were to change, thereby impacting the likelihood of realizing the deferred tax assets, judgement 
would have to be applied in determining the amount of valuation allowance no longer required. Reversal of all or a part of this 
valuation allowance could have a significant positive impact on operating results in the period that it becomes more likely than not 
that certain of the Company’s deferred tax assets will be realized. Alternatively, should our future income decrease from current 
levels, a resulting increase to all or a part of this valuation allowance could also have a significant negative impact on our operating 
results. 

Valuation of Goodwill and Other Intangible Assets 

We account for the valuation of goodwill and other intangible assets after classifying intangible assets into three categories: (1) 
intangible assets with finite lives subject to amortization; (2) intangible assets with indefinite lives not subject to amortization; and (3) 
goodwill. For intangible assets with finite lives, tests for impairment must be performed if conditions exist that indicate that the 
carrying value may not be recoverable. For intangible assets with indefinite lives and goodwill, tests for impairment must be 
performed at least annually or more frequently if events or circumstances indicate that assets might be impaired. 

Goodwill was $2.2 million in each of the years ended December 31, 2015 and 2014, or 2% and 3% of total assets for these 

years, respectively. 

Our goodwill is not being amortized, but we do evaluate the goodwill for impairment annually in the fourth quarter, or when 

there is reason to believe that the value has been diminished or impaired. Evaluations for possible impairment are based upon a 
comparison of the estimated fair value of the reporting unit to which the goodwill has been assigned, versus the sum of the carrying 
value of the assets and liabilities of that unit including the assigned goodwill value. The fair values used in this evaluation are 
estimated based on the Company’s market capitalization, which is based on the Company’s outstanding common stock and market 
price of the stock. Impairment is deemed to exist if the net book value of the unit exceeds its estimated fair value. We have evaluated 
our goodwill and determined no impairment adjustment is required. 

Stock-based Compensation 

Our share-based awards include stock options, restricted stock and restricted stock units (“RSU’s”). We have non-qualified 
stock options outstanding to employees and directors under various stock option plans. The plans require the exercise price of options 
granted under these plans to equal or exceed the fair market value of the Company’s common stock on the date of grant. The options, 
subject to termination of employment, generally expire ten years from the date of grant. Employee stock options typically vest pro-rata 
and quarterly over three or four years. Restricted stock is issued to the employee at grant but is subject to transfer restrictions. Stock is 
issued in exchange for RSUs when vesting conditions are met. The transfer restrictions and vesting conditions may be time- or 
performance-based. Restricted stock and RSUs typically vest pro-rata annually over three or four years. We use the straight-line 
amortization method for recognizing stock option compensation costs. The weighted average grant-date fair value of awards of 
restricted stock, and RSU’s is based on quoted market price of the Company’s common stock on the date of grant. Option, restricted 
stock and RSU grants to employees, officers and directors frequently contain accelerated vesting provisions upon the occurrence of a 
change of control, as defined in the applicable option agreements. 

20 

Full Year 2015 Summary of Operations 

Financial 

(cid:120) 

(cid:120) 

(cid:120) 

(cid:120) 

(cid:120) 

Revenue for 2015 was $54.7 million compared with $50.3 million in 2014 and $48.1 million in 2013. 

Gross margin for 2015 was $45.1 million or 82% of revenues compared with $42.0 million or 83% of revenues in 2014 
and with $40.5 million or 84% of revenues in 2013. 

Net income for 2015 was $5.0 million compared with $4.1 million in 2014 and $10.5 million in 2013. Net income for 
2015 and 2014 included a tax expense of $3.1 million and $2.8 million, respectively. In contrast, net income for 2013 
included a decrease to our tax valuation allowance of $4.1 million. This decrease to the valuation allowance in 2013 was 
recorded as a benefit to the income statement. 

Net income per diluted share was $0.09 for 2015 compared with $0.07 for 2014 and $0.17 for 2013. 

Unrestricted cash was $28.7 million on December 31, 2015. 

Results of Operations 

Revenue 

The following table sets forth a year-over-year comparison of our total revenues: 

(In thousands) 
Revenues 

Year Ended December 31, 
2014 
  $  54,713    $ 50,347    $ 48,138    $

2015 

2013 

Variance 
2015 vs. 2014 
$ 
   % 
4,366      

Variance 
2014 vs. 2013
$ 
9 %   $  2,209     

  % 

5%

Our growth model seeks to continually add new users to the subscriber base, while at the same time retaining a high percentage 
of existing subscribers whose subscriptions are up for renewal. Across all periods presented, revenue increases were driven primarily 
by sales in our three core vertical sales markets: healthcare, finance and government and other non-core markets. Additionally, sales 
continued from a wide base of distributors – new first year orders (“NFYO’s”) derived from our value-added resellers, OEM and other 
third party distribution channels for 2015 were 64% of the total NFYOs compared to 58% in 2014 and 59% in 2013. We measure 
additions to the subscriber base by NFYOs, which is defined as the portion of new orders that are expected to be recognized into 
revenue in the first twelve months of the contract. NFYOs are summarized in the table below: 

(In thousands) 
New first year order value 

Year Ended December 31, 
2014 

2013 

2015 

  $

10,158    $

8,489     $ 

9,020  

Our go-to-market selling strategy promotes multiple-year subscription contracts with the fees paid annually at the inception of 

each year of service. As a result, a high percentage of customers subscribe for a three-year term versus a one-year term. We expect this 
preference for a longer contract term by a relatively high percentage of our customers to continue in 2016, as we have priced our 
services in a manner that encourages these longer-term contracts. 

Our list pricing has remained generally consistent during the periods shown above. However, there are no assurances that 
potential increased competition in this market or other factors, including inflation, will not result in future price erosion. Price erosion, 
should it occur, could have a dampening effect on order growth and the revenue derived from our new orders. 

Revenue Outlook: 

We expect continued growth in our core Email Encryption offering and in our new products, along with increased sales from 

our indirect OEM distribution and value-added reseller channels to increase our NFYOs in 2016 and increase our year-over-year 
revenue. 

Backlog and Orders 

Backlog — Our backlog was $74.2 million at December 31, 2015 compared with $69.3 million at December 31, 2014. The 
backlog is comprised of contractual commitments that we expect to amortize into revenue. As of December 31, 2015, the backlog was 
comprised of the following elements: $24.0 million of deferred revenue that has been billed and paid, $7.3 million billed but unpaid, 
and approximately $42.9 million of unbilled contracts. 

21 

  
  
  
 
 
  
  
  
  
 
 
 
 
 
 
 
  
  
 
  
 
  
  
 
 
 
 
 
     
 
 
The backlog is recognized into revenue ratably as the services are performed. Approximately 57% of the total backlog is 

expected to be recognized as revenue during the next twelve months. 

Orders — Total orders in 2015 were $61.0 million compared with $55.4 million in 2014. Total orders are comprised of contract 

renewals, NFYOs, and in the case of new multi-year contracts, the years beyond the first year of service. 

Cost of Revenue 

The following table sets forth a year-over-year comparison of the cost of revenue. 

(In thousands) 
Cost of revenue 

Year Ended December 31, 
2014 
8,324    $

2015 
  $  9,593    $

2013 
7,614    $

Variance 
2015 vs. 2014 
% 
$ 
1,269      

Variance 
2014 vs. 2013
$ 

% 

15 %   $ 

710     

9%

Cost of revenue is comprised of expenses related to operating and maintaining the ZixData Center, a field deployment team, 
customer service and support and the amortization of Company-owned, customer-based computer appliances. The 15% increase in 
cost of revenue in 2015 compared with 2014 resulted primarily from increases in average headcount, software maintenance and 
license support, as well as depreciation expense related to networking equipment. These investments support growth in customers and 
users and positions us for these expected increases associated with our Cisco partnership.  

The 9% increase in cost of revenue in 2014 compared with 2013 resulted primarily from increases in average headcount and 

depreciation expense relating to investments in ZixOne networking infrastructure. In 2014, we increased customer support and 
deployment resources to support growth in the number of reseller and managed service provider channel partners, and support of our 
new products, ZixOne and ZixDLP. 

Research and Development Expenses 

The following table sets forth a year-over-year comparison of our research and development expenses: 

(In thousands) 
Research and development expenses 

Year Ended December 31, 
2014 
  $  8,317    $ 9,051    $ 9,563    $

2013 

2015 

Variance 
2015 vs. 2014 
$ 
  % 
(734)    

(8 )%   $ 

Variance 
2014 vs. 2013
$ 
(512)    

  % 

(5)%

Research and development expenses consist primarily of salary, benefits and stock-based compensation for our development 

staff, independent contractor expense, and other direct and indirect costs associated with enhancing our existing products and services 
and developing new products and services. 

The 8% decrease in research and development expense in 2015 compared with 2014 reflected in the table above resulted 
primarily from reduction in average headcount and outside contractor expense, partially offset by increases in depreciation expense. 
The decrease in headcount and contractor expense reflects lower required investment in 2015 following the launch of the ZixOne 
product in 2014. Depreciation expense increased in 2015 due to upgrades to our development facilities and fixtures in our Dallas 
office. 

The 5% decrease in research and development expense in 2014 compared with 2013 resulted primarily from reduction in 

contractor headcount, partially offset by increases related to hiring research and development personnel. 

Selling and Marketing Expenses 

The following table sets forth a year-over-year comparison of our selling and marketing expenses: 

(In thousands) 
Selling and marketing expenses 

Year Ended December 31, 
2014 
  $  18,075    $ 18,284    $ 13,416    $

2015 

2013 

Variance 
2015  vs. 2014 
$ 
% 
(209)     

Variance 
2014  vs. 2013
$ 

% 

(1 )%   $  4,868     

36%

Selling and marketing expenses consist primarily of salary, commissions, travel, stock-based compensation and employee 

benefits for selling and marketing personnel as well as costs associated with promotional activities and advertising. 

22 

  
  
  
   
  
  
  
  
   
   
   
   
  
  
   
  
 
 
  
  
  
 
 
  
  
  
  
 
 
 
 
 
 
 
  
  
 
  
 
  
  
  
   
  
  
  
  
   
   
   
   
  
  
   
  
 
The slight decrease in selling and marketing expense in 2015 compared with 2014 resulted primarily from decreases in 
advertising expense partially offset by increases in commission and bonus expense. Commission and bonus expenses were higher in 
2015 as a result of improved performance compared to 2014, primarily in NFYO and earnings metrics.  

The $4.9 million increase in selling and marketing expense in 2014 compared with 2013 resulted primarily from increases in 

average headcount and advertising and promotional expense associated with the launch of our ZixOne product. The increase was split 
approximately evenly between increases in sales average headcount and in advertising/ promotional expense. 

General and Administrative Expenses 

The following table sets forth a year-over-year comparison of our general and administrative expenses: 

(In thousands) 
General and administrative expenses 

Year Ended December 31, 
2014 

2013 

2015 

Variance 
2015 vs. 2014 
% 
$ 

  $  10,812    $ 7,938    $ 8,230    $ 2,874      

36 %   $ 

Variance 
2014 vs. 2013
$ 
(292)    

% 

(4)%

General and administrative expenses consist primarily of salary and bonuses, travel, stock-based compensation and benefits for 

administrative and executive personnel as well as fees for professional services and other general corporate activities. 

The $2.9 million increase in general and administrative expense in 2015 compared with 2014 resulted primarily from CEO 
transition related severance costs, higher variable compensation bonus expense, and higher legal and consulting fees. These increases 
were partially offset by lower depreciation and facilities expense, including a utility true-up credit from our Dallas landlord.  

The $0.3 million decrease in general and administrative expense from 2013 to 2014 resulted primarily from lower outside legal 

counsel fees associated with litigation partially offset by higher average headcount costs. 

Income Taxes 

Our Company or one of our subsidiaries files income tax returns in the U.S. federal jurisdiction and various states and in the 

Canadian federal and provincial jurisdictions. We recognize and measure uncertain tax positions using a two-step approach. The first 
step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely 
than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second 
step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement. 

Our Company incurred a tax expense of $3.1 million for 2015 and $2.8 million for 2014. This contrasts to an income tax benefit 

of $1.0 million for 2013.  For all years presented, tax expense represented refundable U.S. Alternative Minimum Tax, U.S. research 
and development credits, non-U.S. taxes payable related to the operations of the Company’s Canadian subsidiary established in late 
2002, and state income taxes. For 2013, tax benefit also included reversals of a portion of the Company's historical valuation 
allowance. 

Significant judgement is required in determining any valuation allowance recorded against deferred tax assets. In assessing the 
need for a valuation allowance, we consider available evidence, including past earnings, estimates of future taxable income, and the 
feasibility of tax planning strategies. At December 31, 2015, the Company partially reserved its U.S. net deferred tax assets due to the 
uncertainty of future taxable income sufficient to utilize net loss carryforwards prior to their expiration. The portion of the Company’s 
deferred tax asset not reserved was $48.9 million. The majority of this unreserved portion related to $41.8 million U.S. net operating 
losses (“NOLs”) because we believe the Company will generate sufficient taxable income in future years to utilize these NOLs prior 
to their expiration.  The remaining balance consists of $4.1 million relating to temporary timing differences between GAAP and tax-
related expense, $1.8 million relating to U.S. state tax income credits, and $1.2 million related to Alternative Minimum Tax credits. 

We have determined that utilization of existing NOLs against future taxable income is not limited by Section 382 of the Internal 

Revenue Code. Future ownership changes, however, may limit the company's ability to fully utilize its existing net operating loss 
carryforwards against any future taxable income. 

If we begin to generate additional U.S. taxable income in a future period or if the facts and circumstances on which our current 

estimates and assumptions are based were to change, thereby impacting the likelihood of realizing a greater or lesser amount of our 
deferred tax assets, judgement would have to be applied in determining the amount of valuation allowance required. Adjusting our 
valuation allowance could have a significant impact on operating results in the period that it becomes more likely than not that an 
additional portion of our deferred tax assets will or will not be realized. 

23 

  
  
  
   
  
  
  
  
   
   
   
   
  
  
   
  
 
Our provision for income taxes is subject to volatility and could be adversely impacted by earnings being lower or higher than 
anticipated; by tax effects of nondeductible compensation; or by changes in tax laws, regulations, or accounting principles, including 
accounting for uncertain tax positions or interpretations. Significant judgment is required to determine the recognition and 
measurement applicable to all income tax positions. This includes the potential recovery of previously paid taxes, which if settled 
unfavorably could adversely affect our provision for income taxes or additional paid-in capital. In addition, our income tax returns are 
subject to examination by the Internal Revenue Service and other tax authorities. We regularly assess the likelihood of adverse 
outcomes resulting from these examinations to determine the adequacy of our provision for income. 

Net Income 

Net Income – The Company generated net income of $5.0 million in 2015 compared with $4.1 million in 2014 and $10.5 million 

in 2013. The net income in 2013 included a decrease to our tax valuation allowance of $4.1 million, of which $2.7 million was due to 
2013 operations and offset current tax expense. The remaining $1.4 million was due to a partial reversal of the remaining tax valuation 
allowance and recorded as a tax benefit 

Liquidity and Capital Resources 

Overview 

Based on our 2015 financial results and current expectations, we believe our cash and cash equivalents, and cash generated from 

operations, will satisfy our working capital needs, capital expenditures, investment requirements, contractual obligations, 
commitments, future customer financings, and other liquidity requirements associated with our operations through at least the next 
twelve months. We plan for and measure our liquidity and capital resources through an annual budgeting process. During 2015, our 
cash flow from operations was $15.6 million, which represents a 17% increase over cash flow from operations during 2014. At 
December 31, 2015, our cash and cash equivalents totaled $28.7 million and we had no debt. This represents a $7.0 million increase 
over our cash balance as of December 31, 2014, which occurred notwithstanding our expenditure of $15 million during 2015 under a 
share repurchase program that completed in October 2015. 

For the year ended December 31, 2015, we achieved 9% growth in revenue, 82% gross margin and strong cash collections. 

While future results cannot be guaranteed, we expect these trends to continue in the foreseeable future, and believe a significant 
portion of our spending is discretionary and flexible and that we have the ability to adjust overall cash spending to react, as needed, to 
any shortfalls in projected cash. 

Sources and Uses of Cash 

(In thousands) 
Net cash provided by operations 
Net cash used in investing activities 
Net cash used in financing activities 

Years Ended December 31, 
2014 

2013 

2015 

  $
  $
  $

15,617    $
(1,951)  $
(6,687)  $

13,317     $ 
(3,402 )   $ 
(15,748 )   $ 

13,298 
(1,593)
(7,175)

Our primary source of liquidity from operations was the collection of revenue in advance from our customers, accounts 

receivable from our customers, and the management of the timing of payments to our vendors and service providers. 

Cash used in our investing activities for 2015 consisted of $1.5 million computing equipment purchases primarily to satisfy 

customer contracts. Approximately 25% of these capital purchases were for computer servers, which are required to deliver our 
services. The remaining purchases consisted primarily of leasehold improvements. Our 2014 investing activities consist of $1.9 
million in computer and networking equipment purchases and $1.5 million in furniture and leasehold improvements associated with 
the lease renewal for our Dallas headquarters in 2013.  

Cash used in financing activities in 2015 included $15.0 million used to repurchase our common stock and $361 thousand used 

in the repurchase of common stock related to the tax impact of vesting restricted awards offset by $8.7 million received from the 
exercise of stock options. The stock repurchases were made pursuant to a stock repurchase program authorized by our board of 
directors, which was completed in October 2015. Cash used in financing activities in 2014 included $16.2 million used to repurchase 
our common stock and $257 thousand used in the repurchase of common stock related to the tax impact of vesting restricted awards 
offset by $748 thousand received from the exercise of stock options.  

24 

  
  
 
 
 
   
    
 
 
Options of ZixCorp Common Stock 

We have significant options outstanding that are currently vested. There is no assurance that any of these options will be 
exercised; therefore the extent of future cash inflow and related dilution from additional option activity is not certain. The following 
table summarizes the options that were outstanding as of December 31, 2015. The vested options are a subset of the outstanding 
options. The value of the options is the number of options exercisable into shares multiplied by the exercise price for each share. 

Exercise Price Range 

Summary of Outstanding Options 

Total Value of
Outstanding
Options 
(In thousands)     

Vested 
Options 
(included in 
outstanding 
options) 

Outstanding
Options

Total Value of
Vested 
Options 
(In thousands)  
287 
1,091 
4,730 
6,108  

204,050     $
287      
1,467      
428,828      
4,730       1,003,360      
6,484       1,636,238     $

$1.11 - $1.99 
$2.00 - $3.49 
$3.50 - $4.99 
Total 

Liquidity Summary 

204,050    $
567,142     
    1,003,360     
    1,774,552    $

Based on our current 2016 budget plans, we believe we have adequate resources and liquidity to sustain operations for at least 

the next twelve months. 

Off-Balance Sheet Arrangements 

None. 

Contractual Obligations and Contingent Liabilities and Commitments 

We have total contractual obligations over the next year of $1.4 million and $3.5 million over the next three years primarily 

consisting of various operating office lease agreements. The lease of our headquarters facility in Dallas expires in 2024. 

A summary of our fixed contractual obligations and commitments at December 31, 2015, is as follows: 

(In thousands) 
Operating leases 

Total 

1 Year 

Payments Due by Period 
2-3 Years 

4-5 Years 

> 5 Years 

  $

9,717    $

1,369    $

2,158     $ 

2,065    $

4,125   

We have severance agreements with certain employees which would require us to pay up to approximately $4.3 million if all 

such employees separated from employment with our Company following a triggering event (e.g., change of control) as defined in the 
severance agreements. 

New Accounting Standards 

Revenue Recognition 

In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (ASU 2014-
09), which supersedes most current revenue recognition guidance under U.S. GAAP. The core principle of ASU 2014-09 is to recognize 
revenues when promised goods or services are transferred to customers in an amount that reflects the consideration to which an entity 
expects to be entitled for those goods or services. ASU 2014-09 defines a five step process to achieve this core principle and, in doing so, 
more judgement and estimates may be required within the revenue recognition process than are required under existing U.S. GAAP. 

The standard is effective for us beginning in 2018, and requires using either of the following transition methods: (i) a full 
retrospective approach reflecting the application of the standard in each prior reporting period with the option to elect certain practical 
expedients, or (ii) a retrospective approach with the cumulative effect of initially adopting ASU 2014-09 recognized at the date of 
adoption (which includes additional footnote disclosures). We are currently evaluating the impact of our pending adoption of ASU 2014-
09 on our consolidated financial statements and have not yet determined the method by which we will adopt the standard in 2018. 

25 

  
  
 
 
 
   
     
   
   
 
  
  
 
 
 
   
   
     
   
 
 
Classification of Deferred Taxes 

In November 2015, the FASB issued guidance that requires entities to present deferred tax assets and deferred tax liabilities as 
noncurrent in a classified balance sheet. The standard will be effective for annual periods beginning after December 15, 2016, but may be 
adopted early. This new guidance does not have a material impact on our consolidated financial statements. We have chosen to 
prospectively apply the guidance to our 2015 balance sheet. Prior year balance sheets were not retroactively adjusted. 

Item 7A. Quantitative and Qualitative Disclosures About Market Risk 

We do not believe that we face exposure to material market risk with respect to our cash, cash equivalents and restricted cash 
investments, which totaled $28.7 and $21.7 million at December 31, 2015 and 2014, respectively. We held no marketable securities 
and no debt as of December 31, 2015 and 2014. 

Item 8. Financial Statements and Supplementary Data 

The information required by this Item 8 begins on page F-1 of this Annual Report on Form 10-K. 

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure 

None. 

Item 9A. Controls and Procedures 

Effectiveness of Disclosure Controls and Procedure 

In accordance with Rule 13a-15(b) of the Exchange Act, as of the end of the period covered by this Annual Report on Form 10-
K, management evaluated, with the participation of our principal executive officer and principal financial officer, the effectiveness of 
the design and operation of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) under the Exchange Act). 
Based on their evaluation of these disclosure controls and procedures, they have concluded that our disclosure controls and procedures 
were effective as of the date of such evaluation. 

Certifications of our principal executive officer and our principal accounting officer, which are required in accordance with Rule 

13a- 14 of the Exchange Act, are attached as exhibits to this Annual Report. This “Controls and Procedures” section includes the 
information concerning controls evaluation referred to in the certifications, and it should be read in conjunction with the certifications 
for a more complete understanding of the topics presented. 

Management’s Annual Report on Internal Control Over Financial Reporting 

Management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is 
defined in Exchange Act Rule 13a-15(f). 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 risk that controls may 
become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. 

Management assessed the effectiveness of our internal control over financial reporting as of December 31, 2015. In making this 

assessment, management used the criteria set forth in 2013 by the Committee of Sponsoring Organizations of the Treadway 
Commission in “Internal Control—Integrated Framework”. Based on this assessment, our management concluded that, as of 
December 31, 2015, our internal control over financial reporting was effective based on those criteria. 

The effectiveness of our internal control over financial reporting as of December 31, 2015, has been audited by Whitley Penn 

LLP, an independent registered public accounting firm, as stated in their report which is included herein. 

Changes in Internal Controls over Financial Reporting 

During the three months ended December 31, 2015, there have been no changes in our internal control over financial reporting 
identified in connection with the evaluation described above that have materially affected or are reasonably likely to materially affect 
internal control over financial reporting. 

26 

 
 
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM 

To the Board of Directors and Stockholders of 
Zix Corporation 

We have audited Zix Corporation and subsidiaries’ (the “Company”) internal control over financial reporting as of December 31, 2015 
based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations 
of the Treadway Commission (COSO). 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 Annual 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 conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those 
standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over 
financial reporting was maintained in all material respects. Our audit of internal control over financial reporting included obtaining an 
understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating 
the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other 
procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion. 

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. 

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 
2015, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring 
Organizations of the Treadway Commission. 

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the 
consolidated balance sheets of the Company as of December 31, 2015 and 2014, and the related consolidated statements of income, 
stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2015, and our report dated 
March 10, 2016, expressed an unqualified opinion on those consolidated financial statements. 

/s/ WHITLEY PENN LLP 

Dallas, Texas 
March 10, 2016 

27 

Item 9B. Other Information 

None. 

28 

 
 
PART III 

Item 10. Directors, Executive Officers and Corporate Governance 

Certain information required by this Item 10 is incorporated by reference from our Proxy Statement related to the 2016 Annual 

Meeting of Shareholders under the sections “OTHER INFORMATION YOU NEED TO MAKE AN INFORMED DECISION — 
Directors, Executive Officers and Significant Employees” and “Section 16(a) Beneficial Ownership Reporting Compliance,” and 
“CORPORATE GOVERNANCE — Code of Ethics,” and “Nominating and Corporate Governance Committee, Selection of Director 
Nominees,” and “Audit Committee.” 

The board of directors has adopted a Code of Conduct and Code of Ethics that applies to all directors, officers and employees of 

the Company. A copy of this document is available on our website at www.zixcorp.com under “Corporate Governance.”  Any waiver 
or amendment of the Code of Ethics with respect to our chief executive officer and senior financial officers will be publicly disclosed 
as required by applicable law and regulation, including by posting the waiver on our website. 

Item 11. Executive Compensation 

The information required by this Item 11, including certain information pertaining to Company securities authorized for 
issuance under equity compensation plans, is incorporated by reference from our Proxy Statement related to the 2016 Annual Meeting 
of Shareholders under the section “COMPENSATION OF DIRECTORS AND EXECUTIVE OFFICERS.” 

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters 

The information required by this Item 12 is incorporated by reference from our Proxy Statement related to the 2016 Annual 

Meeting of Shareholders under the section “SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND 
MANAGEMENT” and “COMPENSATION OF DIRECTORS AND EXECUTIVE OFFICERS — Equity Compensation Plan 
Information.” 

Item 13. Certain Relationships and Related Transactions, and Director Independence 

The information required by this Item 13 is incorporated by reference from our Proxy Statement related to the 2016 Annual 

Meeting of Shareholders under the section “COMPENSATION OF DIRECTORS AND EXECUTIVE OFFICERS — Certain 
Relationships and Related Transactions” and “CORPORATE GOVERNANCE — Corporate Governance Requirements and Board 
Member Independence.” 

Item 14. Principal Accountant Fees and Services 

The information required by this Item 14 is incorporated by reference from our Proxy Statement related to the 2016 Annual 

Meeting of Shareholders under the section “INDEPENDENT REGISTERED PUBLIC ACCOUNTANTS.” 

29 

 
 
PART IV 

Item 15. Exhibits and Financial Statement Schedules 

(a)(1) Financial Statements 

See Index to Consolidated Financial Statements on page F-1 hereof. 

(a)(2) Financial Statement Schedules 

All schedules for which provision is made in the applicable accounting regulations of the SEC have been omitted because of the 

absence of the conditions under which they are required or because the information required is included in the consolidated financial 
statements or notes thereto. 

(a)(3) Exhibits 

Exhibit 
Number 

3.1 

  —   Restated Articles of Incorporation of Zix Corporation, as filed with the Texas Secretary of State on November 10, 2005. 
Filed as Exhibit 3.1 to Zix Corporation’s Annual Report on Form 10-K for the year ended December 31, 2005, and 
incorporated herein by reference. 

Description 

3.2 

  —   Amended and Restated Bylaws of Zix Corporation dated March 12, 2014. Filed as Exhibit 3.2 to Zix Corporation’s Form 

10-K for the year ended December 31, 2013, and incorporated herein by reference. 

10.1† 

10.2† 

  —   1995 Long-Term Incentive Plan of Zix Corporation (Amended and Restated as of September 20, 2000). Filed as Exhibit 
10.3 to Zix Corporation’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2000, and 
incorporated herein by reference. 

  —   Zix Corporation 1999 Directors’ Stock Option Plan (Amended and Restated as of August 1, 2002). Filed as Exhibit 10.1 
to Zix Corporation’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2002, and incorporated 
herein by reference. 

10.3† 

  —   Zix Corporation 2001 Employee Stock Option Plan (Amended and Restated as of June 7, 2007). Filed as Exhibit 10.6 to 

Zix Corporation’s Report on Form 8-K, filed June 12, 2007, and incorporated herein by reference. 

10.4† 

  —   Zix Corporation’s 2001 Stock Option Plan (Amended and Restated as of June 7, 2007). Filed as Exhibit 10.5 to Zix 

Corporation’s Report on Form 8-K, filed June 12, 2007, and incorporated herein by reference. 

10.5† 

  —   Zix Corporation’s 2003 New Employee Stock Option Plan (Amended and Restated as of June 7, 2007). Filed as Exhibit 

10.4 to Zix Corporation’s Report on Form 8-K, filed June 12, 2007, and incorporated herein by reference. 

10.6† 

  —   Zix Corporation 2004 Stock Option Plan (Amended and Restated as of June 7, 2007). Filed as Exhibit 10.3 to Zix 

Corporation’s Report on Form 8-K, filed June 12, 2007, and incorporated herein by reference. 

10.7† 

  —   Zix Corporation 2004 Stock Option Plan (Amended and Restated as of May 25, 2005). Filed as Exhibit 10.1 to Zix 

Corporation’s Registration Statement on Form S-8 (Registration No. 333-126576), dated July 13, 2005, and incorporated 
herein by reference. 

10.8† 

  —   Zix Corporation 2004 Directors’ Stock Option Plan, dated May 6, 2004. Filed as Exhibit 10.2 to Zix Corporation’s 

Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2004, and incorporated herein by reference. 

10.9† 

  —   Zix Corporation 2006 Directors’ Stock Option Plan (Amended and Restated as of June 7, 2007) Filed as Exhibit 10.1 to 

Zix Corporation’s Current Report on Form 8-K, filed June 12, 2007, and incorporated herein by reference. 

10.10† 

  —   Form of Stock Option Agreement (with no “change in control” provision) for Zix Corporation Stock Option Plans. Filed 
as Exhibit 10.2 to Zix Corporation’s Registration Statement on Form S-8 (Registration No. 333-126576), dated July 13, 
2005, and incorporated herein by reference. 

10.11† 

  —   Form of Stock Option Agreement (with “change in control” provision) for Zix Corporation Stock Option Plans. Filed as 
Exhibit 10.3 to Zix Corporation’s Registration Statement on Form S-8 (Registration No. 333-126576), dated July 13, 
2005, and incorporated herein by reference. 

10.12† 

  —   Form of Stock Option Agreement (with “acceleration event” provision) for Zix Corporation Stock Option Plans and 

applicable to option agreements held by the Company’s chief executive officer and direct reports. Filed as Exhibit 10.17 

30 

  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit 
Number 

Description 

to Zix Corporation’s Annual Report on Form 10-K for the year ended December 31, 2007, and incorporated herein by 
reference. 

10.13 

  —   Zix Corporation 401(k) Retirement Plan. Filed as Exhibit 10.10 to Zix Corporation’s Annual Report on Form 10-K for 

the year ended December 31, 2003, and incorporated herein by reference. 

10.14 

  —   Adoption Agreement relating to Zix Corporation 401(k) Retirement Plan. Filed as Exhibit 10.11 to Zix Corporation’s 

Annual Report on Form 10-K for the year ended December 31, 2003, and incorporated herein by reference. 

10.15† 

  —   Form of Zix Corporation Outside Director Stock Option Agreement. Filed as Exhibit 10.3 to Zix Corporation’s Quarterly 

Report on Form 10-Q for the quarterly period ended June 30, 2004, and incorporated herein by reference. 

10.16† 

  —   Form of Zix Corporation Outside Director Stock Option Agreement. Filed as Exhibit 10.1 to Zix Corporation's Quarterly 

Report on Form 10-Q for the period ended June 30, 2010, and incorporated herein by reference. 

10.17† 

  —   Form of Zix Corporation Employee Stock Option Agreement. Filed as Exhibit 10.2 to Zix Corporation's Quarterly 

Report on Form 10-Q for the period ended June 30, 2010, and incorporated herein by reference. 

10.18† 

  —   Form of Director Indemnification Agreement.  Filed as Exhibit 10.1 to Zix Corporation’s Current Report on Form 8-K 

dated December 20, 2010, and incorporated herein by reference. 

10.19† 

  —   Form of Executive Termination Benefits Agreement.  Filed as Exhibit 10.1 to Zix Corporation's Quarterly Report on 

Form 10-Q for the period ended June 30, 2011, and incorporated herein by reference. 

10.20† 

  —   Zix Corporation 2012 Incentive Plan. Filed as Appendix A of Schedule 14A on April 27, 2012, and incorporated herein 

by reference. 

10.21† 

  —   Form of Executive Termination Benefits Agreement. Filed as Exhibit 10.1 to Zix Corporation’s Quarterly Report on 

Form 10-Q for the period ended September 30, 2012, and incorporated herein by reference. 

10.22 

  —   Shareholder’s Agreement dated December 28, 2012, among Zix Corporation, and Rockall Emerging Markets Master 

Fund Limited, Meldrum Asset Management, LLC, Fulvio Dobrich, Con Egan, Conor O’Driscoll, Michael E. Dailey, and 
Mark J. Bonney. Filed as Exhibit 10.1 to Zix Corporation’s Current Report on Form 8-K dated December 31, 2012, and 
incorporated herein by reference. 

10.23 

  —   Form of Amended and Restated Employment Termination Benefits Agreement. Filed as Exhibit 10.1 to Zix 

Corporation’s Quarterly Report on Form 10-Q for the period ended June 30, 2015, and incorporated herein by reference.

10.24 

  —   Zix Corporation Amended and Restated 2012 Incentive Plan. Filed as Appendix A of Schedule 14A on May 13, 2015, 

and incorporated herein by reference. 

10.25 

  —   Letter Agreement Concerning Transition Matters, dated as of July 21, 2015, by and between Zix Corporation and 

Richard D. Spurr. Filed as exhibit 10.3 to Zix Corporation’s Quarterly report on Form 10-Q for the period ended June 
30, 2015, and incorporated herein by reference. 

10.26 

  —   Second Amended and Restated Employment Termination Benefits Agreement, dated as of July 21, 2015, by and 

between Zix Corporation and Richard D. Spurr. Filed as Exhibit 10.4 to Zix Corporation’s Quarterly Report on Form 10-
Q for the period ended June 30, 2015, and incorporated herein by reference. 

10.27* 

  —   Amendment No. One to Zix Corporation Amended and Restated 2012 Incentive Plan. 

10.28**   —   Amendment No. One to Zix Corporation Stock Option Agreement, dated as of January 18, 2016, between Richard D. 

Spurr and Zix Corporation. 

10.29**   —   Amendment No. One to Zix Corporation Employee Stock Option Agreement, dated as of January 18, 2016, between 

Richard D. Spurr and Zix Corporation. 

10.30**   —   Amendment No. One to Zix Corporation Employee Stock Option Agreement, dated as of January 18, 2016, between 

Richard D. Spurr and Zix Corporation. 

21.1 

  —   Subsidiaries of Zix Corporation.  Filed as Exhibit 21.1 to Zix Corporation's Annual Report on Form 10-K dated 

December 31, 2009, and incorporated herein by reference.  

31 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
     
 
 
     
 
 
     
 
 
     
 
 
     
 
 
     
 
 
     
 
 
 
 
 
Exhibit 
Number 

Description 

23.1* 

  —   Consent of Independent Registered Public Accounting Firm (Whitley Penn LLP). 

31.1* 

  —   Certification of David J. Wagner, President and Chief Executive Officer of the Company, pursuant to Section 302 of the 

Sarbanes-Oxley Act of 2002. 

31.2* 

  —   Certification of Michael W. English, Chief Financial Officer (Principal Financial Officer and Principal Accounting 

Officer) of the Company, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 

32.1** 

  —   Certification of David J. Wagner and Michael W. English, pursuant to 18 U.S.C. Section 1350, as adopted, pursuant to 

Section 906 of the Sarbanes-Oxley Act of 2002. 

101.1* 

  —   101. INS (XBRL Instance Document) 

101. SCH (XBRL Taxonomy Extension Schema Document) 

101. CAL (XBRL Calculation Linkbase Document) 

101. LAB (XBRL Taxonomy Label Linkbase Document) 

101. DEF (XBRL Taxonomy Linkbase Document) 

101. PRE (XBRL Taxonomy Presentation Linkbase Document) 

Filed herewith. 
Furnished herewith. 

* 
** 
†  Management contract or compensatory plan or arrangement. 

32 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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, in the city of Dallas, state of Texas, on March 10, 2016. 

SIGNATURES 

ZIX CORPORATION 

By:  /s/ MICHAEL W. ENGLISH 

Michael W. English 
Chief Financial Officer (Principal Financial 
Officer and Principal Accounting Officer) 

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons 

on behalf of the Registrant and in the capacities indicated on March 10, 2016. 

Signature 

Title 

/s/ DAVID J. WAGNER 
(David J. Wagner) 

/s/ MICHAEL W. ENGLISH 
(Michael W. English) 

/s/ MARK J. BONNEY 
(Mark J. Bonney) 

/s/ TAHER A. ELGAMAL 
(Taher A. Elgamal) 

/s/ ROBERT C. HAUSMANN 
(Robert C. Hausmann) 

/s/ MARIBESS L. MILLER 
(Maribess L. Miller) 

/s/ RICHARD D. SPURR 
(Richard D. Spurr) 

  Chief Executive Officer, President and Director 

(Principal Executive Officer)  

  Chief Financial Officer 

(Principal Financial Officer and Principal Accounting Officer) 

  Director 

  Director 

  Chairman, Director 

  Director 

  Director 

33 

  
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
INDEX TO CONSOLIDATED FINANCIAL STATEMENTS 

Report of Independent Registered Public Accounting Firm ..............................................................................................................  F-2
Consolidated Balance Sheets at December 31, 2015 and 2014 .........................................................................................................  F-3
Consolidated Statements of Income for the years ended December 31, 2015, 2014, and 2013 .........................................................  F-4
Consolidated Statements of Stockholders’ Equity for the years ended December 31, 2015, 2014, and 2013 ...................................  F-5
Consolidated Statements of Cash Flows for the years ended December 31, 2015, 2014, and 2013 ..................................................  F-6
Notes to Consolidated Financial Statements ......................................................................................................................................  F-7

 
 
 
 
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM 

To the Board of Directors and Stockholders of 
Zix Corporation 

We have audited the accompanying consolidated balance sheets of Zix Corporation and subsidiaries ( the “Company”), as of 
December 31, 2015 and 2014, and the related consolidated statements of income, stockholders’ equity, and cash flows for each of the 
years in the three-year period ended December 31, 2015. The Company’s management is responsible for these financial statements. 
Our responsibility is to express an opinion on these financial statements based on our audits. 

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those 
standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of 
material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial 
statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as 
evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion. 

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of 
the Company, as of December 31, 2015 and 2014, and the results of their operations and their cash flows for each of the years in the 
three-year period ended December 31, 2015 in conformity with accounting principles generally accepted in the United States of 
America. 

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the 
Company’s internal control over financial reporting as of December 31, 2015, 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 March 10, 2016 expressed an unqualified opinion. 

As discussed in Note 2 to the financial statements, the Company has changed its method of accounting related to classification of 
deferred tax asset and liabilities as noncurrent on the balance sheet in 2015 due to the adoption of Accounting Standards Update No. 
2015-17, Income Taxes. The accounting change has been prospectively applied. 

/s/ WHITLEY PENN LLP 

Dallas, Texas 
March 10, 2016 

F-2 

 
 
ZIX CORPORATION 

CONSOLIDATED BALANCE SHEETS 

(In thousands, except share and par value data) 

ASSETS 

Current assets: 

Cash and cash equivalents 
Receivables, net 
Prepaid and other current assets 
Deferred tax assets 

Total current assets 

Property and equipment, net 
Goodwill 
Deferred tax assets 
Total assets 

LIABILITIES AND STOCKHOLDERS’ EQUITY 

Current liabilities: 

Accounts payable 
Accrued expenses 
Deferred revenue 

Total current liabilities 

Long-term liabilities: 
Deferred revenue 
Deferred rent 

Total long-term liabilities 
Total liabilities 

Commitments and contingencies (Note 13) 
Stockholders’ equity: 

Preferred stock, $1 par value, 10,000,000 shares authorized; none issued 
   and outstanding 
Common stock, $0.01 par value, 175,000,000 shares authorized; 77,852,453 issued 
   and 56,546,879 outstanding in 2015 and 75,017,775 issued and 56,980,789 
   outstanding in 2014 
Additional paid-in capital 
Treasury stock, at cost; 21,305,574 common shares in 2015 and 18,036,986 
   common shares in 2014 
Accumulated deficit 

Total stockholders’ equity 
Total liabilities and stockholders’ equity 

December 31, 

2015 

2014 

28,664      $
498       
2,908       
—       
32,070       
4,143       
2,161       
48,912       
87,286      $

370      $
4,697       
23,182       
28,249       

839       
1,426       
2,265       
30,514       

21,685 
1,452 
2,372 
1,763 
27,272 
4,399 
2,161 
49,892 
83,724 

506 
2,930 
21,587 
25,023 

898 
1,533 
2,431 
27,454 

—       

— 

767       
372,400       

(82,243 )     
(234,152 )     
56,772       
87,286      $

741 
361,579 

(66,882)
(239,168)
56,270 
83,724   

   $

   $

   $

   $

See notes to consolidated financial statements. 

F-3 

  
  
 
 
 
  
 
 
    
       
 
    
       
 
    
    
    
    
    
    
    
    
       
 
    
       
 
    
    
    
    
       
 
    
    
    
    
    
       
 
    
       
 
    
    
    
    
    
    
  
 
 
ZIX CORPORATION 

CONSOLIDATED STATEMENTS OF INCOME 

(In thousands, except share and per share data) 
Revenues 

Cost of revenue 

Gross margin 

Research and development expenses 
Selling, general and administrative expenses 

Operating income 
Other income (expense): 

Investment and other income 

Total other income 

Income before income taxes 
Income tax (expense) benefit 
Net income 
Basic income per common share 
Diluted income per common share 

Weighted average shares outstanding 
Basic common shares outstanding 
Diluted common shares outstanding 

2015 

Year Ended December 31, 
2014 

2013 

  $

  $
  $
  $

54,713    $ 
9,593      
45,120      
8,317      
28,887      
7,916      

244      
244      
8,160      
(3,144)     
5,016    $ 
0.09    $ 
0.09    $ 

50,347    $
8,324     
42,023     
9,051     
26,222     
6,750     

183     
183     
6,933     
(2,830)    
4,103    $
0.07    $
0.07    $

48,138 
7,614 
40,524 
9,563 
21,646 
9,315 

132 
132 
9,447 
1,006 
10,453 
0.17 
0.17 

56,421,833      
57,476,006      

57,948,864     
58,966,625     

61,139,035 
62,526,507   

See notes to consolidated financial statements. 

F-4 

  
  
 
 
 
 
 
 
 
 
   
   
   
   
   
   
      
     
 
   
   
   
   
  
   
      
     
 
   
      
     
 
   
   
  
 
 
ZIX CORPORATION 

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY 

Common Stock 

Paid-In  

  Treasury       Accumulated  

Stockholders’ Equity 

Additional

(In thousands, except share data) 
Balance, December 31, 2012 
Issuance of common stock upon exercise of stock 
   options 
Issuance of common stock upon vesting of 
   restricted stock units 
Issuance of restricted common stock 
Employee stock-based compensation costs 
Treasury repurchase program 
Net income 
Balance, December 31, 2013 
Issuance of common stock upon exercise of stock 
   options 
Issuance of common stock upon vesting of 
   restricted stock units 
Issuance of restricted common stock 
Employee stock-based compensation costs 
Treasury repurchase program 
Net income 
Balance, December 31, 2014 
Issuance of common stock upon exercise of stock 
   options 
Issuance of common stock upon vesting of 
   restricted stock units 
Issuance of restricted common stock 
Employee stock-based compensation costs 
Treasury repurchase program 
Net income 
Balance, December 31, 2015 

Total 
Stockholders’  
Equity 

Shares 
    73,165,433    $

  Amount 

  Capital 

Stock 

      Deficit 

728    $ 355,747    $ (41,506 )   $  (253,724)    

61,245 

839,263     

9     

1,696     

—       

—     

1,705 

28,250     
385,000     
—     
—     
—     
    74,417,946     

—     
—     
—     
—     
—     
1,711     
—     
—     
—     
—     
737      359,154     

—       
—       
(120 )     
(8,760 )     
—       

—     
—     
—     
—     
10,453     
(50,386 )      (243,271)    

— 
— 
1,591 
(8,760)
10,453 
66,234 

407,829     

4     

744     

—       

—     

748 

52,000     
140,000     
—     
—     
—     
    75,017,775     

—     
—     
—     
—     
1,681     
—     
—     
—     
—     
—     
741      361,579     

—       
—       
(257 )     
(16,239 )     
—       

—     
—     
—     
—     
4,103     
(66,882 )      (239,168)    

— 
— 
1,424 
(16,239)
4,103 
56,270 

    2,668,928     

26     

8,648     

—       

—     

8,674 

65,750     
100,000     
—     
—     
—     
    77,852,453    $

—     
—     
—     
—     
—     
—     
—     
—     
—     
5,016     
767    $ 372,400    $ (82,243 )   $  (234,152)   $

—       
—       
(361 )     
(15,000 )     
—       

—     
—     
2,173     
—     
—     

— 
— 
1,812 
(15,000)
5,016 
56,772  

See notes to consolidated financial statements. 

F-5 

  
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
  
 
 
ZIX CORPORATION 

CONSOLIDATED STATEMENTS OF CASH FLOWS 

(In thousands) 
Operating activities: 
Net income 
Non-cash items in net income: 

Depreciation and amortization 
Employee stock-based compensation expense 
Changes in deferred taxes 

Changes in operating assets and liabilities: 

Receivables 
Prepaid and other assets 
Accounts payable 
Deferred revenue 
Accrued and other liabilities 

Net cash provided by operating activities 

Investing activities: 

Purchases of property and equipment 

Net cash used in investing activities 

Financing activities: 

Proceeds from exercise of stock options 
Treasury stock 

Net cash used in financing activities 

Increase (decrease) in cash and cash equivalents 
Cash and cash equivalents, beginning of year 
Cash and cash equivalents, end of year 

2015 

Year Ended December 31, 
2014 

2013 

  $

5,016    $ 

4,103    $

10,453 

2,152      
2,173      
2,743      

954      
(536)     
(81)     
1,536      
1,660      
15,617      

(1,951)     
(1,951)     

8,674      
(15,361)     
(6,687)     
6,979      
21,685      
28,664    $ 

1,623     
1,681     
2,398     

872     
(334)    
(1)    
2,127     
848     
13,317     

(3,402)    
(3,402)    

748     
(16,496)    
(15,748)    
(5,833)    
27,518     
21,685    $

1,466 
1,711 
(1,401)

(1,357)
(341)
(103)
1,986 
884 
13,298 

(1,593)
(1,593)

1,705 
(8,880)
(7,175)
4,530 
22,988 
27,518   

  $

See notes to consolidated financial statements. 

F-6 

  
  
 
 
 
 
 
 
 
 
   
      
     
 
   
      
     
 
   
   
   
   
      
     
 
   
   
   
   
   
   
   
      
     
 
   
   
   
      
     
 
   
   
   
   
   
  
 
 
ZIX CORPORATION 

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

1. Company Overview 

Zix Corporation (“ZixCorp,” the “Company,” “we,” “our,” “us”) provides email encryption, data loss prevention (“DLP”) and 

Bring-Your-Own-Device (“BYOD”) solutions to meet the data protection and compliance needs of organizations primarily in the 
healthcare, financial services, and government sectors. 

2. Summary of Significant Accounting Policies 

Basis of Presentation — The accompanying consolidated financial statements include the accounts of all our wholly-owned 

subsidiaries and are prepared in accordance with accounting principles generally accepted in the United States of America. All inter-
company accounts and transactions have been eliminated in consolidation. 

Use of Estimates — The preparation of consolidated financial statements in conformity with accounting principles generally 

accepted in the United States of America requires management to make estimates and assumptions that affect the reported amount of 
assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the 
reported amounts of revenue and expenses during the reported period. Our significant estimates include primarily those required in the 
valuation or impairment analysis of goodwill, property and equipment, revenue recognition, allowances for doubtful accounts, stock-
based compensation, litigation accruals, valuation allowances for deferred tax assets and tax accruals. Although we believe that 
adequate accruals have been made for unsettled issues, additional gains or losses could occur in future years from resolutions of 
outstanding matters. Actual results could differ materially from original estimates. 

Cash Equivalents — Cash investments with maturities of three months or less when purchased are considered cash equivalents. 

Fair Value of Financial Instruments —The Company does not measure the fair value of any financial instrument other than cash 

equivalents, options, and other equity awards. The carrying values of other financial instruments (receivables and accounts payable) 
are not recorded at fair value but approximate fair values primarily due to their short-term nature. The carrying values of other current 
assets and accrued expenses are also not recorded at fair value, but approximate fair values primarily due to their short-term nature.  

Valuation of Property and Equipment — The accounting policies and estimates relating to property and equipment are 

considered significant because of the potential impact that impairment, obsolescence, or change in an asset’s useful life could have on 
the Company’s operating results. 

We record an impairment charge on the assets to be held and used when we determine based upon certain triggering events that 
the carrying value of property and equipment may not be recoverable based on expected undiscounted cash flows attributable to such 
assets. The amount of a potential impairment is determined by comparing the carrying amount of the asset to either the value 
determined from a projected discounted cash flow method, using a discount rate that is considered to be commensurate with the risk 
inherent in the Company’s current business model or the estimated fair market value. Assumptions are made with respect to future net 
cash flows expected to be generated by the related asset. An impairment charge would be recorded for an amount by which the 
carrying value of the asset exceeded the discounted projected net cash flows or estimated fair market value. Also, even where a current 
impairment charge is not necessary, the remaining useful lives are evaluated. No impairment was recorded for any of the periods 
presented. 

Property and equipment are recorded at cost and depreciated or amortized using the straight-line method over their estimated 
useful lives as follows: computer and office equipment and software — three years; leasehold improvements — the shorter of five 
years or the lease term; and furniture and fixtures — five years. 

Goodwill — We account for the valuation of goodwill and other intangible assets after classifying intangible assets into three 

categories: (1) intangible assets with finite lives subject to amortization; (2) intangible assets with indefinite lives not subject to 
amortization; and (3) goodwill. For intangible assets with finite lives, tests for impairment must be performed if conditions exist that 
indicate the carrying value may not be recoverable. For intangible assets with indefinite lives and goodwill, tests for impairment must 
be performed at least annually or more frequently if events or circumstances indicate that assets might be impaired. 

Goodwill was $2.2 million, or 2% and 3% of total assets for the years ended December 31, 2015 and 2014, respectively. 

Our goodwill is not being amortized, but we do evaluate the goodwill for impairment annually in the fourth quarter, or when 

there is reason to believe that the value has been diminished or impaired. Evaluations for possible impairment are based upon a 

F-7 

 
 
 
 
comparison of the estimated fair value of the reporting unit to which the goodwill has been assigned, versus the sum of the carrying 
value of the assets and liabilities of that unit including the assigned goodwill value. The fair values used in this evaluation are 
estimated based on the Company’s market capitalization, which is based on the outstanding stock and market price of the stock. 
Impairment is deemed to exist if the net book value of the unit exceeds its estimated fair value. No impairment was recorded for any 
of the periods presented. 

Deferred Tax Assets — Deferred tax assets are recognized if it is “more likely than not” that the benefit of the deferred tax asset 

will be realized on future federal or state income tax returns. At December 31, 2015, we provided a valuation allowance against a 
significant portion, $46.1 million, of our accumulated U.S. deferred tax assets, reflecting our historical losses and the uncertainty of 
future taxable income sufficient to utilize net operating loss carryforwards prior to their expiration. Our total deferred tax asset not 
subject to a valuation allowance is valued at $48.9 million, and consists of $41.8 million for federal net operating loss carryforwards, 
$4.1 million relating to temporary timing differences between GAAP and tax-related expense, $1.8 million relating to U.S. state 
income tax credits and $1.2 million related to Alternative Minimum Tax credits. If U.S. taxable income increases from its current level 
in a future period or if the facts and circumstances on which our estimates and assumptions are based were to change, thereby 
impacting the likelihood of realizing the deferred tax assets, judgment would have to be applied in determining the amount of 
valuation allowance no longer required. Reversal of all or a part of this valuation allowance could have a significant positive impact 
on operating results in the period that it becomes more likely than not that certain of the Company’s deferred tax assets will be 
realized. Alternatively, should our future income decrease from current levels, a resulting increase to all or a part of this valuation 
allowance could also have a significant negative impact on our operating results. 

Leases — A leased asset whose lease terms meet the criteria for capitalization is recorded as an asset and depreciated. If a lease 
does not meet the criteria for capitalization, it is classified as an operating lease and payments are recorded as rent expense. For 2015 
and 2014 we had no leases that qualified as capital leases. Lease renewal options which we are “reasonably assured” of using and the 
related payments are taken into account when initially classifying and recording the lease as a capital lease obligation or as straight-
line rent if an operating lease. Funds provided by the lessor for leasehold improvements are recorded as a deferred lease incentive and 
amortized as a reduction of rent expense over the lease term. 

Revenue Recognition — We develop, market, and support applications that connect, protect and deliver information in a secure 

manner. We generate our sales through both a direct sales team and, increasingly, through our channel partners. We derive our 
revenue from subscription fees for rights related to the use of our software. Software subscription terms typically range from one to 
three years. 

Revenue is recognized when all of the following criteria have been met: 

(cid:120) 

(cid:120) 

(cid:120) 

(cid:120) 

persuasive evidence of an arrangement exists, 

delivery has occurred or services have been rendered, 

the price is fixed and determinable, and 

collectability is probable. 

We record our revenue net of any value added or sales tax. Discounts provided to customers are recorded as reductions in 

revenue. 

We have determined that substantially all of our revenue arrangements are in the scope of the software revenue recognition 

rules. Multiple elements in our software arrangements are sold as a single unit consisting of the following elements: (i) subscription 
licensed software delivered to the customer’s site, (ii) ongoing customer support and, (iii) access to our hosted encryption network 
(Zix encryption network) during the term of the agreement. 

(i) 

Software at the customer site performs critical functions of the email encryption process and is the predominant element in 
our arrangements. Actions performed by the software at the customer site include identifying when encryption is needed 
through the use of filters and lexicons, determining the best method of delivery (BMOD) by examining secure connection 
options and selecting the BMOD. BMOD is a key marketing differentiator for us and is defined as the most secure and 
easiest method to deliver encrypted email. Customers can install the software on their own hardware or we can deliver to 
the customer site hardware that we own. In recent years more customers have opted to have the software installed on their 
own hardware, and as a result the number of Zix supplied hardware devices has declined. Any hardware provided as part 
of our services primarily included manufacturer provided warranty provisions. We recorded no warranty expense in any 
of the presented periods. 

(ii)  Customer support includes unspecified software upgrades, updates and bug fixes and access to live technical support 

technicians and on-line knowledge resources 

F-8 

 
(iii)  The Zix encryption network includes access to our central network which facilitates transparent encrypted email exchange 
among all of our customers by providing public encryption keys (asymmetrical encryption requires two keys- a public key 
provided by the central network and a private key generated by the software at the customer site). The delivered software 
element is essential to the functionality and utility of this central network. The network also enables our customers to send 
encrypted emails to non-Zix customer recipients through a portal. 

A small portion of our revenue (less than 5% in 2015) is derived from hosted email encryption solutions. We apply general 

revenue recognition guidance to these hosted arrangements.  

In all revenue arrangements we cannot determine vendor specific objective evidence (VSOE) and we cannot establish separate 
units of accounting for the multiple elements of our arrangements that are bundled and sold as one unit. All revenue arrangements are 
sales of subscription based (i.e. time-based) licenses. We defer revenue until the software is delivered and the service is deployed. 
Upon deployment, we commence revenue recognition and revenue is recognized ratably over the subscription period generally 
ranging from one to three years.  

Software Development Costs —Costs incurred in the development and testing of subscription software products related to 

research, project planning, training, maintenance and general and administrative activities, and overhead costs are expensed as 
incurred. The costs of relatively minor upgrades and enhancements to the software are also expensed as incurred. 

Costs for the development of new software solutions and substantial enhancements to existing software solutions are expensed 
as incurred until technological feasibility has been established, at which time any additional costs would be capitalized. No research 
and development costs have been capitalized because we believe that technological feasibility is established concurrent with general 
release to customers. 

Research and development costs associated with software developed for internal use on behalf of our customers are capitalized. 

To date, capitalized costs for software developed for internal use on behalf of our customers were not material. 

Advertising Expense — Advertising costs are expensed as incurred. Our operations include advertising expense of $2.1 million, 

$2.9 million, and $959 thousand in 2015, 2014, and 2013, respectively. 

Stock-Based Compensation — We currently use the straight-line amortization method for recognizing stock option and 
restricted stock compensation costs. The measurement and recognition of compensation expense for all share-based payment awards 
made to our employees and directors are based on the estimated fair value of the awards on the grant dates. The grant date fair value is 
estimated using either an option-pricing model which is consistent with the terms of the award or a market observed price, if such a 
price exists. Such cost is recognized over the period during which an employee or director is required to provide service in exchange 
for the award, i.e., “the requisite service period” (which is usually the vesting period). We also estimate the number of instruments that 
will ultimately be earned, rather than accounting for forfeitures as they occur. 

Earnings Per Share (“EPS”) — Basic EPS is based on the weighted average number of common shares outstanding during 
each period. Diluted EPS adjusts Basic EPS for the effects of dilutive common stock equivalents outstanding during each period using 
the treasury stock method. 

New Accounting Standards 

Revenue Recognition 

In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (ASU 

2014-09), which supersedes most current revenue recognition guidance under U.S. GAAP. The core principle of ASU 2014-09 is to 
recognize revenues when promised goods or services are transferred to customers in an amount that reflects the consideration to which 
an entity expects to be entitled for those goods or services. ASU 2014-09 defines a five step process to achieve this core principle and, 
in doing so, more judgment and estimates may be required within the revenue recognition process than are required under existing 
U.S. GAAP. 

The standard is effective for us beginning 2018, and requires using either of the following transition methods: (i) a full 

retrospective approach reflecting the application of the standard in each prior reporting period with the option to elect certain practical 
expedients, or (ii) a retrospective approach with the cumulative effect of initially adopting ASU 2014-09 recognized at the date of 
adoption (which includes additional footnote disclosures). We are currently evaluating the impact of our pending adoption of ASU 
2014-09 on our consolidated financial statements and have not yet determined the method by which we will adopt the standard in 
2018. 

F-9 

   
Classification of Deferred Taxes 

In November 2015, the FASB issued guidance that requires entities to present deferred tax assets and deferred tax liabilities as 

noncurrent on the balance sheet. The standard will be effective for annual periods beginning after December 15, 2016, but may be 
adopted early. This new guidance did not have a material impact on our consolidated financial statements. We have chosen to 
prospectively apply the guidance to our 2015 balance sheet. Prior year balances were not retroactively adjusted. 

3. Stock Options and Stock-based Employee Compensation 

Below is a summary of common stock options outstanding at December 31, 2015: 

Authorized 
Shares

Options 
Outstanding  

Options 
Vested 

Available 
for Grant

Employee and Director Stock Option Plans: 
2001 Stock Option Plan 
2001 Employee Stock Option Plan 
2004 Stock Option Plan 
2006 Director’s Stock Option Plan 
2012 Incentive Plan 
Total 

11,400      
4,020      

    2,525,000     
300,000     

— 
11,400      
— 
4,020      
— 
    5,000,000      1,258,069       1,258,069      
209,500      
    1,100,000     
— 
    6,300,000     
153,249       3,751,308 
    15,225,000      1,774,552       1,636,238       3,751,308  

209,500      
291,563      

Under all of our stock option plans, new shares are issued when options are exercised. 

Employee and Director Stock Option Plans 

We have non-qualified stock options outstanding to employees and directors under various stock option plans. The plans require 

the exercise price of options granted under these plans to equal or exceed the fair market value of the Company’s common stock on 
the date of grant. The options, subject to termination of employment, generally expire ten years from the date of grant. Historically, 
our employee options typically vested pro-rata and quarterly over three years. Option grants to employees, officers and directors 
frequently contain accelerated vesting provisions upon the occurrence of a change of control, as defined in the applicable option 
agreements. 

Under the terms of the 2012 Incentive Plan adopted by the Company’s Board of Directors on April 13, 2012 (the “2012 Plan”), 

2,700,000 shares are available for issuance, plus a number of additional shares (not to exceed 1,327,000) underlying options 
outstanding under certain of the Company’s prior equity plans that thereafter terminate or expire unexercised, or are cancelled, 
forfeited, or lapse for any reason. Our shareholders approved an Amended and Restated 2012 Incentive Plan during our annual 
meeting held June 24, 2015, increasing the number of shares available for grant by 3,600,000. Awards issued under the 2012 Plan 
typically vest pro-rata and quarterly over four years. 

Accounting Treatment 

We use the straight-line amortization method for recognizing stock option compensation costs. Our share-based awards include 

stock options, restricted stock awards (“RSAs”), restricted stock units (“RSUs”), and performance units (“PUs”). 

For the twelve months ended December 31, 2015, 2014, and 2013, respectively, the total stock-based compensation expense 

resulting from stock options, RSAs, RSUs, and PUs was recorded to the following line items of our consolidated statements of 
income: 

(In thousands) 
Cost of revenue 
Research and development expenses 
Selling, general and administrative expenses 
Stock-based compensation expense 

Year Ended December 31, 
2014 

2013 

2015 

  $

  $

182    $
242     
1,749     
2,173    $

180     $ 
237       
1,264       
1,681     $ 

172 
212 
1,327 
1,711  

Our 2015 stock-based compensation expense includes $540 thousand related to the accelerated vesting of awards related to our 
CEO departure. A deferred tax asset of $625 thousand, $462 thousand and $483 thousand, resulting from stock-based compensation 
expense associated with awards relating to the Company’s U.S. operations, was recorded for the twelve months ended December 31, 
2015, 2014 and 2013, respectively. As of December 31, 2015, there was $2.1 million of total unrecognized stock-based compensation 

F-10 

 
 
 
  
  
 
 
 
  
    
 
   
  
 
   
  
 
    
  
      
  
 
   
  
  
  
 
 
 
 
 
     
 
   
   
  
related to non-vested share-based compensation awards granted under the stock option plans. This cost is expected to be recognized 
over a weighted average period of 1.5 years. 

We used the Black-Scholes Option Pricing Model (“BSOPM”) to determine the fair value of option grants made during 2013. 
No options were granted in 2014 or 2015. On January 1, 2006, we elected to use the “simplified” method to calculate the estimated 
life of options granted to employees. The Company continued to use the “simplified” method for all options granted through 2013. 
The Company has elected to use the “historical” method to calculate the estimated life of any options that may be granted in the 
future. The expected stock price volatility was calculated by averaging the historical volatility of the Company’s common stock over a 
term equal to the expected life of the options. 

The following weighted average assumptions were applied in determining the fair value of options granted during the respective 

periods: 

Risk-free interest rate 
Expected option life (years) 
Expected stock price volatility 
Expected dividend yield 
Fair value of options granted 

Year Ended December 31, 
2014 

2013 

2015 

—     
—     
—     
—     
—     

—       
—       
—       
—       
—     $ 

1.05%
5.8  
69%
—  
1.99   

The assumptions used in the BSOPM valuation are critical as a change in any given factor could have a material impact on the 

financial results of the Company. The weighted average grant-date fair value of awards of restricted stock and RSU’s is based on 
quoted market price of the Company’s common stock on the date of grant. 

Stock Option Activity 

There were 2,668,928 stock options exercised for the twelve months ended December 31, 2015. As a result of these stock option 

exercises, there was $19 thousand in excess tax benefits recorded in 2015. For the comparative period in 2014, there were 407,829 
stock option exercises. 

The following is a summary of all stock option transactions for the three years ended December 31, 2015: 

Outstanding at January 1, 2013 
Granted at market price 
Cancelled or expired 
Exercised 

Outstanding at December 31, 2013 

Granted at market price 
Cancelled or expired 
Exercised 

Outstanding at December 31, 2014 

Granted at market price 
Cancelled or expired 
Exercised 

Outstanding at December 31, 2015 
Options exercisable at December 31, 2015 

Weighted 
Average 
Exercise 
Price 

Weighted 
Average 
Remaining 
Contractual 
Term (Yrs)

4.28       
3.27       
5.15       
2.03       
4.50       
—       
7.71       
1.83       
3.42       
—       
4.69       
3.25       
3.65       

3.73       

3.41 

3.13  

Shares 

  7,684,776    $
150,000    $
(247,139)  $
(839,263)  $
  6,748,374    $
—     
  (1,850,036)  $
(407,829)  $
  4,490,509    $
—     
(47,029)  $
  (2,668,928)  $
  1,774,552    $

  1,636,238    $

At December 31, 2015, all 1,774,552 options outstanding and all 1,636,238 options exercisable had an exercise price lower than 

the market value of the Company’s common stock. The aggregate intrinsic value of these options was $2.5 million and $2.2 million, 
respectively.  At December 31, 2014, we had 2,207,201 options outstanding and 1,852,423 options exercisable in which the exercise 
price was lower than the market value of the Company’s common stock. The aggregate intrinsic value of these options was $2.4 
million and $2.1 million, respectively. 

F-11 

  
  
 
  
  
 
   
    
  
   
   
   
   
   
  
  
  
 
 
 
     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
The total intrinsic value of options exercised during the years ended December 31, 2015 and 2014, was $4.4 million and $716 

thousand, respectively. 

Summarized information about stock options outstanding at December 31, 2015, is as follows: 

Range of 
Exercise Prices 
$1.11 - $1.99 
$2.00 - $3.49 
$3.50 - $4.99 

Options Outstanding 
Weighted 
Average 
Remaining 
Contractual 
Life

Options Exercisable 

Weighted 
Average 
Exercise 
Price 

Number 
Exercisable  

Weighted 
Average 
Exercise 
Price

2.15    $
5.61    $
2.37    $
3.41    $

204,050  $
1.41       
428,828  $
2.59       
4.71        1,003,360  $
3.65        1,636,238  $

1.41 
2.54 
4.71 
3.73   

Number 
Outstanding  
204,050 
567,142 
    1,003,360 
    1,774,552 

There were 4,135,731 and 5,908,498 exercisable options at December 31, 2014 and 2013, respectively. 

Restricted Stock Activity 

The following is a summary of all restricted stock activity during the three years ended December 31, 2015: 

Non-vested at January 1, 2013 
Granted at market price 
Vested 
Cancelled 

Non-vested restricted stock at December 31, 2013 

Granted at market price 
Vested 
Cancelled 

Non-vested restricted stock at December 31, 2014 

Granted at market price 
Vested 
Cancelled 

Non-vested restricted stock at December 31, 2015 

Restricted 
Shares
351,000    $ 
385,000    $ 
(87,750)   $ 
—      
648,250    $ 
140,000    $ 
(184,000)   $ 
—      
604,250    $ 
100,000    $ 
(240,750)   $ 
(40,250)   $ 
423,250  (cid:3)(cid:3) $ 

Weighted 
Average 
Fair Value 

2.49  
3.45  
2.49  
—  
3.06  
4.66  
2.99  
—  
3.45  
5.18  
3.35  
3.57  

3.91  

As a result of these vesting RSA’s $84 thousand in excess tax benefits was recorded in 2015.   

F-12 

  
  
 
     
 
 
 
 
 
     
 
 
   
 
   
 
 
  
 
  
  
  
 
     
 
 
 
 
 
 
 
 
 
 
 
 
 
   
  
Restricted Stock Unit Activity 

The following is a summary of all RSU activity during the three years ended December 31, 2015: 

Non-vested at January 1, 2013 
Granted at market price 
Vested 
Cancelled 

Non-vested restricted stock units at December 31, 2013 

Granted at market price 
Vested 
Cancelled 

Non-vested restricted stock units at December 31, 2014 

Granted at market price 
Vested 
Cancelled 

Non-vested restricted stock units at December 31, 2015 

Restricted 
Stock Units

Weighted 
Average 
Fair Value 

113,000    $ 
95,000    $ 
(28,250)   $ 
—      
179,750    $ 
55,000    $ 
(52,000)   $ 
—      
182,750    $ 
215,000    $ 
(65,750)   $ 
(32,500)   $ 
299,500    $ 

2.49  
3.45  
2.49  
—  
3.00  
4.66  
2.93  
—  
3.52  
3.88  
3.29  
3.88  
3.79  

Performance Unit Activity 

The following is a summary of all PU activity during the two years ended December 31, 2015: 

Non-vested at January 1, 2014 
Granted at market price 
Vested 
Forfeited 

Non-vested restricted stock units at December 31, 2014 

Granted at market price 
Vested 
Forfeited 

Non-vested restricted stock units at December 31, 2015 

Restricted 
Stock Units

Weighted 
Average 
Fair Value 

—      
100,000    $ 
—      
(100,000)   $ 
—      
215,000    $ 
—      
(32,500)   $ 
182,500    $ 

—  
4.66  
—  
4.66  
—  
3.88  
—  
3.88  
3.88  

In February 2016 the Compensation Committee of our board of directors approved the achievement of certain 2015 performance 
metrics, resulting in the vesting of 27,428 PUs during the first quarter 2016. An additional 10,350 PU’s vested in the first quarter 2016 
related to our CEO separation.  

The weighted average grant-date fair value of awards of restricted stock and RSUs (collectively “restricted stock”) and PUs is 

based on the quoted market price of the Company’s common stock on the date of grant. 

4. Supplemental Cash Flow Information 

Supplemental information relating to taxes and noncash activities: 

(In thousands) 
Income tax payments 
Payables related to purchases of capitalized assets 
Excess tax benefit on exercise and vesting of employee 
   equity awards 

  $
  $

  $

Year Ended December 31, 
2014 

2013 

2015 

332    $
55    $

426     $ 
(12 )   $ 

217 
(97)

103    $

168     $ 

427  

F-13 

  
  
 
     
 
   
   
   
   
   
   
   
   
   
   
   
   
 
  
  
  
 
     
 
   
   
   
   
   
   
   
   
 
  
 
 
 
  
  
 
 
 
   
    
 
  
 
5. Receivables, net 

(In thousands) 

Gross accounts receivables 
Allowance for returns and doubtful accounts 
Unpaid portion of deferred revenue 
Note receivable 
Allowance for note receivable 

Receivables, net 

December 31, 

2015 

2014 

7,882    $ 
(59)     
(7,325)     
458      
(458)     
498    $ 

8,116  
(108 )
(6,556 )
458  
(458 )
1,452   

  $

  $

Our gross accounts receivables for the year ended 2014 included $318 thousand associated with a tenant improvement 
allowance received as an incentive when we renewed the lease for our Dallas headquarters in 2013. The tenant improvement 
receivable was collected in full in the first quarter 2015. 

The allowance for doubtful accounts includes all specific accounts receivable which we believe are likely not collectable based 

on known information. In addition, we record 2.5% of all accounts receivable greater than 90 days past due, net of those accounts 
specifically reserved, as a general allowance against accounts that could potentially become uncollectible. 

The reduction for deferred revenue represents future customer service or maintenance obligations which have been billed to 
customers, but remain unpaid as of the respective balance sheet dates. Deferred revenue on our consolidated balance sheets represents 
future customer service or maintenance obligations which have been billed and collected as of the respective balance sheet dates. 

The note receivable represents the remaining outstanding balance of an original note related to the sale of a product line in 2005 

in the amount of $540 thousand. This was fully reserved at the time of the sale as the note’s collectability was not assured. The note 
receivable is fully reserved at December 31, 2015. 

6. Prepaid and other current assets 

(In thousands) 

Prepaid insurance, maintenance, software licenses and other 
Deferred commissions 
Tax-related 

Prepaid and other current assets 

7. Property and Equipment 

(In thousands) 

Computer and office equipment and software 
Leasehold improvements 
Furniture and fixtures 

Less accumulated depreciation and amortization 
Total Property and Equipment 

December 31, 

2015 

2014 

2,596    $ 
364      
(52)     
2,908    $ 

1,954  
443  
(25 )
2,372   

December 31, 

2015 

2014 

23,797    $ 
6,663      
1,969      
32,429      
(28,286)     
4,143    $ 

23,013  
6,398  
1,916  
31,327  
(26,928 )
4,399   

  $

  $

  $

  $

Our operations include depreciation and amortization expense related to property and equipment of $2.2 million, $1.6 million, 

and $1.5 million in 2015, 2014, and 2013, respectfully. 

8. Goodwill 

At December 31, 2015 and 2014, we had goodwill totaling $2.2 million. We evaluate goodwill for impairment annually in the 

fourth quarter, or when there is reason to believe that the value has been diminished or impaired. There were no impairment indicators 
to the goodwill recorded as of December 31, 2015. 

F-14 

  
 
 
  
 
     
 
   
   
   
   
  
 
 
  
 
 
  
 
    
 
   
   
  
 
  
 
 
  
 
    
 
   
   
  
   
   
  
 
 
 
 
9. Accrued Expenses 

(In thousands) 
Employee compensation and benefits 
Professional fees 
Taxes 
Other 
Total accrued expenses 

December 31, 

2015 

2014 

3,028    $ 
467      
399      
803      
4,697    $ 

1,061  
473  
378  
1,018  
2,930  

  $

  $

10. Fair Value Measurements 

FASB guidance regarding fair value measurement establishes a three-tier fair value hierarchy, which prioritizes the inputs used 
in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets for identical 
assets or liabilities; Level 2, defined as inputs other than quoted prices for similar assets and liabilities in active markets that are either 
directly or indirectly observable; and Level 3, defined as unobservable inputs for which little or no market data exists, therefore 
requiring an entity to develop its own assumptions. 

11. Earnings Per Share and Potential Dilution 

Basic earnings per share are computed using the weighted average number of common shares outstanding for the period. The 

dilutive effect of potential common shares outstanding is included in diluted earnings per share. The computations for basic and 
diluted earnings per share for the years ended December 31, 2015, 2014, and 2013, are as follows: 

Basic weighted average shares 
Effect of dilutive securities: 
Employee and director stock options 
Restricted Stock 
RSUs 
PUs 
Potential dilutive common shares 

2015 
  56,421,833 

Year Ended December 31, 
2014 

  (cid:3)(cid:3)
  57,948,864       61,139,035 

2013 

741,002 
172,126 
100,353 
40,692 
  57,476,006 

782,659        1,095,227 
225,741 
181,219       
66,504 
53,832       
— 
51       
  58,966,625       62,526,507  

For the years ended December 31, 2015, 2014, and 2013, weighted average shares related to certain stock options of 1,005,328, 

3,240,594, and 4,054,261 respectively, were excluded from the calculation of diluted earnings per share because the stock options 
were anti-dilutive. Anti-dilutive restricted stock, RSUs, and PUs of 56,542, 33,512, and 24,486, respectively, were also excluded from 
the calculation for the year ended December 31, 2015. Anti-dilutive restricted stock, RSUs, and PUs of 147,292, 50,833, and 33,333, 
respectively, were excluded from the calculation for the year ended December 31, 2014. Anti-dilutive restricted stock and RSUs of 
31,281, and 7,719, respectively, were excluded from the calculation for the year ended December 31, 2013. 

12. Significant Customers 

In 2015, 2014, and 2013, no single customer accounted for 10% or more of our revenues. 

13. Commitments and Contingencies 

Leases 

We lease office facilities under non-cancelable operating lease agreements. Our operations include rent expense for these 
operating leases of $1.4 million in each of 2015 and 2014, and $1.3 million in 2013. The lease of our headquarters facility in Dallas 
expires in 2024. 

A summary of our fixed contractual obligations and commitments at December 31, 2015, is as follows: 

 (In thousands) 
Operating leases 

2016 
  $  1,369    $

2017 
1,131    $

2018 
1,027    $

F-15 

2019 
1,030    $  1,035     $  4,125    $

      Thereafter    

2020 

Total 

9,717   

  
  
 
 
 
    
 
   
   
   
  
 
 
 
  
  
 
 
  
 
 
 
 
 
       
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
   
   
   
    
 
  
Claims and Proceedings 

We are subject to legal proceedings, claims, and litigation against our business. While the outcome of these matters is currently 

not determinable and the costs and expenses of defending these matters may be significant, we currently do not expect that the 
ultimate costs to resolve these matters will have a material adverse effect on our consolidated financial statements. 

14. Income Taxes 

Components of the income taxes are as follows: 

(In thousands) 
Current: 
U.S. 
State 
Foreign 

Deferred 

Federal 
State 
Foreign 

Income tax expense (benefit) 

2015 

2014 

2013 

  $

  $

58    $
196     
146     

2,744     
—     
—     
3,144    $

67     $ 
240       
125       

2,396       
—       
2       
2,830     $ 

124 
148 
123 

(1,400)
— 
(1)
(1,006)

A reconciliation of the expected U.S. tax expense (benefit) to income taxes is as follows: 

(In thousands) 
Expected tax (benefit) expense at U.S. statutory rate 
Decrease in valuations allowance- Operations 
Decrease in valuations allowance- Other 
Nondeductible expense and nontaxable income 
State income taxes 
Foreign income taxes 
Other 
Income tax expense (benefit) 

2015 

2014 

2013 

2,775    $
—     
—     
133     
129     
146     
(39)   
3,144    $

2,357     $ 
—       
—       
127       
224       
127       
(5 )     
2,830     $ 

3,212 
(2,650)
(1,400)
(370)
98 
122 
(18)
(1,006)

  $

  $

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities 
for financial reporting purposes and the amounts used for income tax purposes. Components of our U.S. deferred income taxes as of 
December 31, 2015 and 2014 are as follows: 

(In thousands) 
Deferred tax assets: 
Reserves- Other 
U.S. net operating loss carryforwards 
State net operating loss carryforwards 
Tax credit carryforwards 
Stock-based compensation 
Intangible assets 
Depreciable assets 
Other assets 
Total deferred tax assets 

Deferred tax liabilities: 
Prepaid expenses 
Total deferred tax assets 

Less valuation allowance 
Net deferred tax assets 

  $

2015 

2014 

156    $ 
84,591      
281      
6,030      
1,767      
98      
1,518      
1,272      
95,713      

325  
86,382  
281  
5,863  
2,623  
538  
1,461  
712  
98,185  

(671)     
95,042      
(46,134)     
48,908    $ 

(496 )
97,689  
(46,038 )
51,651   

  $

The Company has partially reserved its U.S. net deferred tax assets in 2015 and 2014 due to the uncertainty of future taxable 
income. The Company has U.S. net operating loss carryforwards of approximately $249 million which begin to expire in 2020. The 
Company has state credits that net of federal tax expense total $1.7 million which can be utilized through 2027 and state net operating 

F-16 

 
 
  
 
   
    
 
   
     
       
 
   
   
   
     
       
 
   
   
   
  
  
 
   
    
 
   
   
   
   
   
   
  
  
 
    
 
   
      
  
   
   
   
   
   
   
   
   
   
      
  
   
   
   
  
losses that have various expiration dates. The Company also has tax credit carryforwards of approximately $4.3 million consisting of 
business tax credits which begin to expire in 2016 and alternative minimum tax credits which do not expire. 

In 2010, the Company achieved positive earnings and successfully discontinued operations of its e-Prescribing segment. Based 

on the weight of available objective evidence, including the Company’s history of positive earnings from continuing operations and 
successful exit from e-Prescribing, management believed that it was more likely than not that a portion of the deferred tax asset would 
be realized. Accordingly, the Company reduced its valuation allowance by $4.1 million in 2013. 

We have determined that utilization of existing net operating losses against future taxable income is not limited by Section 382 

of the Internal Revenue Code. Future ownership changes, however, may limit the company's ability to fully utilize its existing net 
operating loss carryforwards against any future taxable income. 

The Company or one of our subsidiaries files income tax returns in the U.S. federal jurisdiction and various states and in the 
Canadian federal and provincial jurisdictions. We have not taken a tax position that, if challenged, would have a material effect on the 
financial statements or the effective tax rate for the twelve-months ended December 31, 2015, or during the prior three years. We have 
determined it is not reasonably possible for the amounts of unrecognized tax benefits to significantly increase or decrease within the 
next twelve months. We are currently subject to a three-year statute of limitations by major tax jurisdictions. 

15. Employee Benefit Plan 

401(k) Plan — We have a retirement savings plan structured under Section 401(k) of the Internal Revenue Code covering 

substantially all of our U.S. employees. Under the plan, contributions are voluntarily made by employees, and we may provide 
contributions based on the employees’ contributions. Our operating income includes $389 thousand, $354 thousand, and $297 
thousand, in 2015, 2014, and 2013, respectively, for net contributions from operations to this plan. 

16. ZixCorp Repurchase Program 

During the year ended December 31, 2015, the Company repurchased 3,185,340 shares at an aggregate cost of $15.0 million. 
This completed the $15 million share repurchase authorized by our board of directors in May 2015. On May 11, 2015, the board of 
directors  also  approved  the  termination  of  the  $10  million  share  repurchase  program  announced  in  January  2015.  No  shares  were 
repurchased under that program. 

During the year ended December 31, 2014, we repurchased a total of 4,070,195 shares at an aggregate cost of $16.2 million, as 
authorized by our board of directors under a $15 million share repurchase program announced November 6, 2013, and a $10 million 
repurchase program announced July 30, 2014. The 2014 repurchase activity completed both programs. 

During the year ended December 31, 2013, we repurchased 1,976,900 shares at an aggregate cost of $8.8 million under the $15 

million repurchase program announced November 2013. 

F-17 

 
 
 
 
 
 
17. Quarterly Results of Operations (Unaudited) 

The following is a summary of the quarterly results of operations for the years ended December 31, 2015 and 2014: 

(In thousands except per share data) 
2015 
Revenues 
Gross margin 
Net income 
Basic net income per common share* 
Diluted net income per common share* 
2014 
Revenues 
Gross margin 
Net income 
Basic net income per common share* 
Diluted net income per common share* 

  March 31 

June 30 

     September 30      December 31  

Quarter Ended 

  $

  $

13,073    $
10,860     
1,176     
0.02     
0.02     

12,162    $
10,137     
1,059     
0.02     
0.02     

13,302    $ 
10,873      
1,115      
0.02      
0.02      

12,615    $ 
10,583      
977      
0.02      
0.02      

14,011     $
11,582      
1,927      
0.03      
0.03      

12,705     $
10,643      
1,163      
0.02      
0.02      

14,327 
11,805 
798 
0.01 
0.01 

12,865 
10,660 
904 
0.02 
0.02  

* 

Net income per share is calculated independently for each quarter. The sum of Net income per share for each quarter may not 
equal the total Net income per share for the year due to rounding differences. 

18. Subsequent Events 

On January 5, 2016, the Company’s board of directors approved a share repurchase program that enables the Company to 
purchase up to $15 million of its shares of common stock. The amount and timing of specific repurchases are subject to market 
conditions, applicable to legal requirements and other factors. Any share purchases would be funded from existing cash resources and 
may be suspended or discontinued at any time. The share repurchase program will expire on September 30, 2016. 

On January 19, 2016, the Company’s board of directors appointed David J. Wagner to the positions of Chief Executive Officer 

and President of Zix Corporation and elected Mr. Wagner to the board. Former CEO and President Richard D. Spurr stepped down 
from those positions, effective January 19, 2016. The severance costs related to our CEO transition were recorded to general and 
administrative expense during the year ended December 31, 2015. No additional charges associated with this transition are expected in 
2016. Mr. Spurr remains a member of the board of directors, the size of which has increased from five to six members. Both Mr. 
Wagner and Mr. Spurr will serve on the board for terms that will expire at the 2016 annual meeting of the Company’s shareholders.  

F-18 

  
  
 
 
   
   
     
      
      
 
   
   
   
   
   
     
      
      
 
   
   
   
   
  
 
 
 
 
 
Zix Corporation 
Corporate Information* 

Board of Directors 

Robert C. Hausmann 
Chairman of the Board  

Mark J. Bonney 
President and Chief Executive Officer,  
MVR Communications, Inc. 

Taher A. Elgamal 
Chief Technology Officer of Security, 
Salesforce.com Inc. 

Stock Listing 

The NASDAQ Global Market 
Symbol: ZIXI 

Investor Relations 

Zix Corporation 
2711 N. Haskell Avenue 
Suite 2200, LB 36 
Dallas, TX 75204-2960 
Tel: (214) 515-7357 
Fax: (214) 370-2295 
Email: invest@zixcorp.com 

Maribess L. Miller 
Consultant 

Richard D. Spurr 
Consultant 

David J. Wagner 
Chief Executive Officer 

Executive Officers 

David J. Wagner 
Chief Executive Officer 

Justin K. Ferguson 
Vice President, General Counsel, 
Corporate Secretary 

Michael W. English 
Vice President, Chief Financial Officer 

Russell J. Morgan 
Vice President, Client Services 

David J. Robertson 
Vice President, Engineering 

Corporate Headquarters 
Zix Corporation 
2711 N. Haskell Avenue 
Suite 2200, LB 36 
Dallas, TX 75204-2960 
Tel: (214) 370-2000 
Fax: (214) 370-2070 

* Information current as of April 29, 2016. 

Shareholder Services 

Visit our Web site: investor.zixcorp.com 
where you may request an investor 
packet, listen to quarterly conference 
calls, access recent SEC filings, learn 
about upcoming investor events, and 
sign up for email alerts. 

Stock Transfer Agent and Registrar 

Computershare Trust Company, N.A. 
250 Royall Street 
Canton, MA 02021 
Tel: (800) 942-5909 

Auditors 

Whitley Penn LLP 
Dallas, Texas 

Form 10-K 

Additional copies of the Company’s Annual 
Report on Form 10-K (including exhibits) to the 
Securities and Exchange Commission for the 
year ended December 31, 2015, are available 
without charge at www.zixcorp.com/investors or 
upon written request by email to 
invest@zixcorp.com or from ZixCorp Investor 
Relations at 2711 N. Haskell Ave., Suite 2200, 
LB 36, Dallas, Texas 75204.