You are cordially invited to attend the 2020 Annual Meeting of Stockholders of CytomX Therapeutics, Inc., a Delaware corporation (the “Company” or “CytomX”). The 2020 Annual Meeting of Stockholders will be held on June 17, 2020, at 1:00 p.m., Pacific Time. The 2020 Annual Meeting of Stockholders will be convened and held entirely online due to the emerging public health impact of the coronavirus outbreak (COVID-19) and to support the health and well-being of our partners, employees, and stockholders, You will be able to attend and participate online in the 2020 Annual Meeting of Stockholders by visiting www.virtualshareholdermeeting.com/CTMX2020, where you will be able to listen to the meeting live, submit questions, and vote.

The 2020 Annual Meeting of Stockholders is being convened to conduct the following business:

These items of business are more fully described in the Proxy Statement accompanying this Notice of Annual Meeting of Stockholders. The record date for the 2020 Annual Meeting of Stockholders is April 20, 2020. Only stockholders of record at the close of business on that date are entitled to notice of, and to vote at, the 2020 Annual Meeting of Stockholders or any adjournment thereof.

The Board of Directors recommends that you vote as follows on the matters to be presented to stockholders at the 2020 Annual Meeting of Stockholders:

Your vote is very important. Whether or not you attend the 2020 Annual Meeting of Stockholders (by logging into www.virtualshareholdermeeting.com/CTMX2020), it is important that your shares be represented. We encourage you to read the accompanying Proxy Statement and our Annual Report on Form 10-K for the year ended December 31, 2019, and submit your proxy on the Internet, by phone or by mail in accordance with the instructions

in the Notice of Internet Availability of Proxy Materials. Please review the instructions on the proxy card or the information forwarded by your bank, broker or other holder of record regarding each of these voting options. If you receive more than one set of proxy materials or notice of internet availability because your shares are registered in different names or addresses, each proxy should be signed and submitted to ensure that all of your shares will be voted. Instructions on how to attend the meeting webcast, ask questions or vote your shares online will also be included with the Notice of Internet Availability of Proxy Materials, and are provided in the in the Proxy Statement accompanying this Notice of Annual Meeting of Stockholders.

On behalf of the Board of Directors, thank you for your participation in this important annual process.

We sent you a Notice of Internet Availability of Proxy Materials because the board of directors of CytomX Therapeutics, Inc. (the “Board”) is soliciting your proxy to vote at our 2020 Annual Meeting of Stockholders to be held on June 17, 2020 at 1:00 p.m., Pacific Time. The meeting will be held virtually, via a live webcast at www.virtualshareholdermeeting.com/CTMX2020 . To attend the live webcast, you will need your unique 16-digit control number provided on the Notice of Internet Availability of Proxy Materials.

We invite you to attend the annual meeting to vote on the proposals described in this Proxy Statement. However, you do not need to attend the meeting to vote your shares. Instead, you may vote by proxy over the Internet or by phone by following the instructions provided in the notice or, if you request printed copies of the proxy materials by mail, you may vote by mail.

Pursuant to the rules adopted by the Securities and Exchange Commission (the “SEC”), we have elected to provide access to our Annual Meeting materials, which include this Proxy Statement and our Annual Report on Form 10-K for the year ended December 31, 2019 (the “Form 10-K”), over the internet in lieu of mailing printed copies. We will begin mailing the Notice of Internet Availability to our stockholders of record as of April 20, 2020 (the “Record Date”) for the first time on or about April 29, 2020. The Notice of Internet Availability will contain instructions on how to access and review the 2020 Annual Meeting materials, how to access the live webcast of the 2020 Annual Meeting of Stockholders, and will also contain instructions on how to request a printed copy of the 2020 Annual Meeting materials. In addition, we have provided brokers, dealers, banks, voting trustees and their nominees, at our expense, with additional copies of our proxy materials and the Form 10-K so that our record holders can supply these materials to the beneficial owners of shares of our common stock as of the Record Date. The Form 10-K is also available in the “Financial & Filings” section of our website at http://ir.cytomx.com/financial-information/annual- reports .

As used in this Proxy Statement, “CytomX,” the “Company,” “we” or “us” refer to CytomX Therapeutics, Inc., a Delaware corporation.

Only stockholders of record at the close of business on April 20, 2020 will be entitled to vote at the annual meeting. On this Record Date, there were 45,922,598 shares of common stock outstanding and entitled to vote.

If, on April 20, 2020, your shares were registered directly in your name with our transfer agent, Computershare Trust Company, N.A., then you are a stockholder of record. The notice will be sent to you by mail and via the Internet directly by us. As a stockholder of record, you may vote online during the live webcast of the meeting at www.virtualshareholdermeeting.com/CTMX2020 , or vote by proxy. Whether or not you plan to attend the annual meeting online, we urge you to vote on the Internet or by phone as instructed in the notice or by proxy by mail by requesting a paper copy of the proxy materials as instructed in the notice to ensure your vote is counted.

If, on April 20, 2020, your shares were held in an account at a brokerage firm, bank or other agent, then you are the beneficial owner of shares held in “street name” and the notice is being forwarded to you by that organization. The organization holding your account is considered the stockholder of record for purposes of voting at the annual meeting. As a beneficial owner, you have the right to direct your broker, bank or other agent on how to vote the shares in your account. Your brokerage firm, bank or other agent will not be able to vote in the election of directors unless they have your voting instructions, so it is very important that you indicate your voting instructions to the institution holding your shares. You are also invited to attend the annual meeting online, as instructed in this Proxy Statement. However, since you are not the stockholder of record, you may not vote your shares online during the annual meeting unless you request and obtain a valid proxy from your broker, bank or other agent.

There are four matters scheduled for a vote:

Under rules adopted by the SEC, we are sending the notice to our stockholders of record and beneficial owners as of April 20, 2020. Stockholders will have the ability to access the proxy materials, including this Proxy Statement and our Annual Report on Form 10-K for the fiscal year ended December 31, 2019, on the Internet at www.proxyvote.com or to request a printed or electronic set of the proxy materials at no charge. Instructions on how to access the proxy materials over the Internet and how to request a printed copy may be found on the notice.

In addition, any stockholder may request to receive proxy materials in printed form by mail or electronically by email on an ongoing basis. Choosing to receive future proxy materials by email will save us the cost of printing and mailing documents to stockholders and will reduce the impact of annual meetings on the environment. A stockholder who chooses to receive future proxy materials by email will receive an email prior to next year’s annual meeting with instructions containing a link to those materials and a link to the proxy voting website. A stockholder’s election to receive proxy materials by email will remain in effect until the stockholder terminates it.

Please note that by casting your vote by proxy you are authorizing the individuals listed on the Proxy Card to vote your shares in accordance with your instructions and in their discretion with respect to any other matter that properly comes before the annual meeting or any adjournments or postponements thereof.

The procedures for voting are:

If you are a stockholder of record as of April 20, 2020, you may vote by attending the annual meeting online at www.virtualshareholdermeeting.com/CTMX2020 and following the instructions posted on the webcast portal. You may also vote by proxy over the Internet or by phone by following the instructions provided in the Notice of

Access of Internet Availability of Proxy Materials or, if you request printed copies of the proxy materials by mail, you may vote by mail. If your proxy is properly executed in time to be voted at the annual meeting, the shares represented by the proxy will be voted in accordance with the instructions you provide. Whether or not you plan to attend the annual meeting online, we urge you to vote by proxy to ensure your vote is counted. You may still attend the annual meeting online and vote online at www.virtualshareholdermeeting.com/CTMX2020 if you have already voted by proxy, so long as you do so before voting closes.

If you are a beneficial owner of shares registered in the name of your broker, bank or other agent, you should have received a notice and voting instructions from that organization rather than from us. Simply follow the instructions to ensure that your vote is counted. To vote online at the annual meeting, you must obtain a valid proxy from your broker, bank or other agent. Follow the instructions from your broker, bank or other agent included with the notice, or contact your broker, bank or other agent to request a proxy form.

We provide Internet proxy voting to allow you to vote your shares online, with procedures designed to ensure the authenticity and correctness of your proxy vote instructions. However, please be aware that you must bear any costs associated with your Internet access, such as usage charges from Internet access providers and telephone companies.

On each matter to be voted upon, you have one vote for each share of common stock you owned as of April 20, 2020.

A quorum of stockholders is necessary to take any action at the meeting, other than to adjourn the meeting. The presence, online or by proxy duly authorized, of the holders of a majority of the outstanding shares of stock entitled to vote will constitute a quorum. On April 20, 2020, there were 45,922,598 shares of common stock outstanding and entitled to vote.

Your shares will be counted toward the quorum only if you submit a valid proxy or vote online at the annual meeting. Abstentions and broker non-votes will be counted toward the quorum requirement. If there is no quorum, the chairman of the annual meeting or a majority of the votes present at the annual meeting may adjourn the annual meeting to another date.

If you are a stockholder of record and you return a proxy card without marking any voting selections, your shares will be voted:

If any other matter is properly presented at the meeting, your proxy (one of the individuals named on your proxy card) will vote your shares using his or her best judgment.

If you are a beneficial owner of shares registered in the name of your broker, bank or other agent, your shares are held by your broker, bank or other agent as your nominee, or in “street name,” and you will need to obtain a proxy form from the organization that holds your shares and follow the instructions included on that form regarding how to instruct the organization to vote your shares. If you do not give instructions to your broker, bank or other agent, it can vote your shares with respect to “discretionary” items but not with respect to “non-discretionary” items. Discretionary items are proposals considered routine under the rules of various national securities exchanges, and, in the absence of your voting instructions, your broker, bank or other agent may vote your shares held in street name on such proposals. Non-discretionary items are proposals considered non-routine under the rules of various national securities exchanges, and, in the absence of your voting instructions, your broker, bank or other agent may not vote your shares held in street name on such proposals and the shares will be treated as broker non-votes.

Proposal 1 (the election of directors) and Proposal 4 (non-binding advisory vote to approve the compensation of our named executive officers) are considered non-routine under applicable rules. A broker or other nominee cannot vote without instructions on non-routine matters, and therefore there may be broker non-votes on Proposals 1 and 4. Proposal 2 (the ratification of the appointment of Ernst & Young LLP, as our independent registered public accounting firm for the year ending December 31, 2020) and Proposal 3 (amendment of our Amended and Restated Certificate of Incorporation) are considered routine under applicable rules. A broker or other nominee may generally vote on routine matters, and therefore no broker non-votes are expected to exist in connection with Proposals 2 and 3.

Votes will be counted by the inspector of election appointed for the annual meeting, who will count:

Lloyd A. Rowland, Senior Vice President, General Counsel and Secretary, will serve as the inspector of elections.

We will pay for the entire cost of soliciting proxies. In addition to the notice and the proxy materials, our directors and employees may also solicit proxies online, by telephone or by other means of communication. We will not pay our directors and employees any additional compensation for soliciting proxies. We may also reimburse brokerage firms, banks and other agents for the cost of forwarding the notice and any other proxy materials to beneficial owners.

If you receive more than one notice, your shares are registered in more than one name or are registered in different accounts. Please vote by proxy according to each notice to ensure that all of your shares are voted.

Yes, you can revoke your proxy at any time before the final vote at the annual meeting. If you are a stockholder of record, you may revoke your proxy in any one of three ways:

If you are a beneficial owner, you may revoke your proxy by submitting new instructions to your broker, bank or other agent, or if you have received a proxy from your broker, bank or other agent giving you the right to vote your shares at the annual meeting, by attending our virtual annual meeting by visiting www.virtualshareholdermeeting.com/CTMX2020 with your 16-digit control number (available in your notice and proxy card) and following the instructions to vote online.

This year’s annual meeting will be held entirely online due to the emerging public health impact of the coronavirus outbreak (COVID-19) and to support the health and well-being of our partners, employees, and stockholders. Stockholders of record as of April 20, 2020, will be able to attend and participate in the annual meeting online by accessing www.virtualshareholdermeeting.com/CTMX2020 . To join the annual meeting, you will need to have your 16-digit control number, which is included on your Notice of Internet Availability of Proxy Materials and your proxy card.

Even if you plan to attend the annual meeting online, we recommend that you also vote by proxy as described herein so that your vote will be counted if you decide not to attend the annual meeting.

Access to the audio webcast of the annual meeting. The live audio webcast of the annual meeting will begin promptly at 1:00 p.m., Pacific Time. Online access to the audio webcast will open approximately thirty minutes prior to the start of the annual meeting to allow time for you to log in and test the computer audio system. We encourage our stockholders to access the annual meeting prior to the start time.

Log in Instructions. To attend the online annual meeting, log in at www.virtualshareholdermeeting.com/CTMX2020 . Stockholders will need their unique 16-digit control number, which appears on the Notice of Internet Availability of Proxy Materials and the instructions that accompanied the proxy materials. In the event that you do not have a control number, please contact your broker, bank, or other nominee as soon as possible and no later than June 3, 2020, so that you can be provided with a control number and gain access to the annual meeting.

Submitting questions at the virtual annual meeting. As part of the annual meeting, we will hold a live question and answer session, during which we intend to answer questions submitted during the meeting in accordance with the annual meeting’s rules of conduct that are pertinent to the Company and the meeting matters, as time permits. Questions and answers will be grouped by topic and substantially similar questions will be grouped and answered once. The annual meeting’s rules of conduct will be posted on the Company website approximately 2 weeks prior to the date of the annual meeting.

Technical Assistance. Beginning 30 minutes prior to the start of and during the virtual annual meeting, we will have a support team ready to assist stockholders with any technical difficulties they may have accessing or hearing the virtual meeting.

If you encounter any difficulties accessing the virtual meeting during the check-in or meeting time, you may call our support team at the numbers available on www.virtualshareholdermeeting.com/CTMX2020 .

Availability of live webcast to team members and other constituents. The live audio webcast will be available to not only our stockholders but also our team members and other constituents.

Pursuant to Rule 14a-8 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), some stockholder proposals may be eligible for inclusion in our proxy statement for our 2021 Annual Meeting of Stockholders. Any such proposal must be submitted in writing by December 30, 2020, to our Secretary, care of CytomX Therapeutics, Inc., at 151 Oyster Point Boulevard, Suite 400, South San Francisco, CA 94080, the address of our principal executive offices. If we change the date of our 2021 Annual Meeting of Stockholders by more than 30 days from the date of the 2020 Annual Meeting of Stockholders, the deadline shall be a reasonable time before we begin to print and send our proxy materials. Stockholders interested in submitting such a proposal are advised to contact knowledgeable counsel with regard to the detailed requirements of the applicable securities laws and our bylaws. The submission of a stockholder proposal does not guarantee that it will be included in our proxy statement.

Our bylaws also establish an advance notice procedure for stockholders who wish to present a proposal before an annual meeting of stockholders but do not intend for the proposal to be included in our proxy statement. Our bylaws provide that if you wish to submit a proposal that is not to be included in next year’s proxy statement or nominate a director, a timely written notice of a stockholder proposal must be delivered to, or mailed and received by, our Secretary, care of CytomX Therapeutics, Inc., at 151 Oyster Point Boulevard, Suite 400, South San Francisco, CA 94080, no earlier than February 17, 2021 and no later than the close of business on March 19, 2021, which notice must contain the information specified in our bylaws. If we change the date of our 2021 Annual Meeting of Stockholders by more than 30 days before, or more than 60 days after, the one-year anniversary of the 2020 Annual Meeting of Stockholders, then the written notice of a stockholder proposal that is not intended to be included in our proxy statement must be delivered, or mailed and received, not later than the 90 ^th day prior to our 2021 Annual Meeting of Stockholders or, if later, the 10 ^th day following the day on which certain public disclosure as described in our bylaws of the meeting date is made.

We have adopted a procedure approved by the SEC called “householding.” Under this procedure, stockholders who have the same address may receive only one copy of our annual report, proxy statement or Notice of Internet Availability of Proxy Materials, unless one or more of these stockholders notifies us that they wish to receive individual copies of such documents. This process potentially means extra convenience for stockholders and cost savings for companies.

If you are a beneficial owner of our common stock, once you receive notice from your broker, bank or other agent that they will be householding communications to your address, householding will continue until you are notified otherwise or until you revoke your consent. If, at any time, you no longer wish to participate in householding and would prefer to receive separate copies of our annual report, proxy statement or Notice of Internet Availability

of Proxy Materials, please notify your broker, bank or other agent, and direct your written request to CytomX Therapeutics, Inc., Secretary, at 151 Oyster Point Boulevard, Suite 400, South San Francisco, CA 94080 or contact our Secretary at (650) 528-2923. Upon written or oral request to us, we will promptly deliver a separate copy of the annual report to security holders, proxy statement, or Notice of Internet Availability of Proxy Materials, as applicable, to a security holder at a shared address to which a single copy of the documents was delivered. Stockholders who currently receive multiple copies of our annual report, proxy statement or Notice of Internet Availability of Proxy Materials at their address and would like to request householding of their communications should contact their broker, bank or other agent.

Preliminary voting results will be announced during the live webcast of the annual meeting. Final voting results will be published in a Current Report on Form 8-K filed with the SEC within four business days following the annual meeting.

Our Board currently consists of eight directors and is divided into three classes, designated as Class I, Class II and Class III. Under our Amended and Restated Certificate of Incorporation, our Board is authorized to assign its members in office to each class. Each class has a term of three years. There are currently three directors in Class II, Frederick W. Gluck, Matthew P. Young and Elaine V. Jones, Ph.D., whose terms of office are scheduled to expire at the 2020 Annual Meeting of Stockholders. Each of Frederick W. Gluck, Matthew P. Young and Elaine V. Jones have been nominated for election at the 2020 Annual Meeting of Stockholders.

Any vacancies on our Board resulting from death, resignation, disqualification, removal or other causes, and any newly created directorships resulting from any increase in the number of directors, shall be filled by the affirmative vote of a majority of the directors then in office, even though less than a quorum of the Board. Any director elected to fill a vacancy shall hold office for the remainder of the unexpired term in which the vacancy occurred or newly created directorship was created and until such director’s successor shall have been elected and qualified.

Directors are elected by a majority of the votes cast at the annual meeting and entitled to vote on the election of directors. A majority of votes cast shall mean that the number of shares voted “For” a director’s election exceeds 50% of the number of votes cast with respect to that director’s election, with votes cast including votes “Against” in each case and excluding abstentions and broker non-votes with respect to that director’s election. Shares represented by executed proxies will be voted for the election of the three nominees named below, unless the “Against” or “Abstain” voting selection has been marked on the proxy card.

If any of Frederick W. Gluck, Matthew P. Young and Elaine V. Jones become unavailable for election as a result of an unexpected occurrence, shares that would otherwise be voted for such director will be voted for the election of a substitute nominee proposed by the Nominating and Corporate Governance Committee and nominated by the Board. Mr. Frederick W. Gluck, Mr. Matthew P. Young and Dr. Elaine V. Jones have agreed to serve if elected. Our management has no reason to believe that any of Mr. Frederick W. Gluck, Mr. Matthew P. Young or Dr. Elaine V. Jones will be unable to serve. If elected at the annual meeting, each of Mr. Frederick W. Gluck, Mr. Matthew P. Young or Dr. Elaine V. Jones will serve until the earliest of the 2023 Annual Meeting of Stockholders, or their respective successor is elected and qualified, or until their respective death, resignation or removal.

The following are brief biographies of Mr. Frederick W. Gluck, Mr. Matthew P. Young or Dr. Elaine V. Jones, the nominees for director, and a discussion of their specific experience, qualifications, attributes or skills that led the Nominating and Corporate Governance Committee of the Board to recommend each of Mr. Gluck, Mr. Young and Dr. Jones for director, as of the date of this proxy statement.

Mr. Frederick W. Gluck has served as a member of our Board since September 2010 and was a member of the board of directors of CytomX Therapeutics, LLC until September 2010. Mr. Gluck previously served as a member of the board of directors of Amgen, Inc. from February 1998 to October 2011. He has also served as founding chairman of the board and CEO of our predecessor company, CytomX, LLC, from 2006 to 2008. Mr. Gluck has served as a member of the board of Cynvenio Biosystems, Inc. (now LungLife AI), a private company that was spun off from CytomX in 2008, since 2008. He also served as co-chairman of the board of TrueVision Systems Inc. (“TrueVision”), a private company where he has served on the board from 2007 until 2018, when it was sold to Alcon. Mr. Gluck served as a consultant to McKinsey & Company, Inc., an international management-consulting firm (“McKinsey”), from July 1998 to July 2003. Prior to that, he was Vice Chairman and Director of Bechtel Group, Inc., an engineering, construction and project management company, from 1995 to July 1998. Mr. Gluck is a former partner of McKinsey, where he served from 1967 to 1995. Between 1988 and 1994, he led McKinsey as its global Managing Director. He also serves as a director of the Foundation Board of the University of California, Santa Barbara, the Kavli Institute of Theoretical Physics and The New York Presbyterian Hospital (Emeritus). Mr. Gluck has also served as the presiding director of the Hospital Corporation of America. Mr. Gluck received his B.S. from Manhattan College and M.S. from New York University in electrical engineering. We believe that Mr. Gluck is qualified to serve on our Board due to his extensive management experience, substantial experience in the life sciences industry and his well-known expertise in corporate strategy.

Mr. Matthew P. Young has served as a member of our board of directors since September 2015. Mr. Young was appointed chief operating officer and chief financial officer of GRAIL in October 2019. Prior to joining GRAIL, Mr. Young had served as executive vice president and chief financial officer of Jazz Pharmaceuticals a role he held since February 2015. He previously had served as senior vice president and chief financial officer of Jazz since March 2014 and as senior vice president, corporate development of Jazz since April 2013. Prior to joining Jazz, Mr. Young worked in investment banking for approximately 20 years. From February 2009 to April 2013, he served as a managing director in global healthcare of Barclays Capital Inc., an investment banking firm, where his role included acting as the co-head of life sciences at Barclays Capital. From 2007 to 2008, Mr. Young served as a managing director of Citigroup Global Markets Inc., an investment banking firm, and from 2003 to 2007, as a managing director of Lehman Brothers Inc., an investment banking firm. In 2015, he joined the board of directors of PRA Health Sciences Inc., a contract research company. Mr. Young received a B.S. in economics and a M.B.A. from the Wharton School of the University of Pennsylvania. We believe that Mr. Young is qualified to serve on our Board due to his extensive management experience, significant experience in the life sciences industry and financial expertise.

Dr. Elaine V. Jones has served as a member of our Board since May 2019. Dr. Jones retired in April 2019 from her role as vice president, worldwide business development and senior partner at Pfizer Ventures, the venture capital arm of Pfizer Inc. After joining Pfizer Ventures as executive director in 2008, Dr. Jones was responsible for making and managing venture investments for Pfizer as well as serving in Board roles for several and therapeutic companies. Prior to this, Dr. Jones held the position of general partner at EuclidSR Partners, a venture firm specializing in private investment in private and public equity within the health sciences, healthcare, biopharmaceutical sectors, until 2008. Dr. Jones began her investment career at S.R. One, the corporate investment fund of GlaxoSmithKline, which she joined in 1999. Prior to this, Dr. Jones served as director of scientific licensing at SmithKline Beecham and as a research scientist in the research and development division of SmithKline Beecham Pharmaceutical. During her venture career, Dr. Jones has served on the boards of more than 20 early to mid-stage biotechnology, therapeutic and pharmaceutical companies. Dr. Jones currently serves as a member of the board of directors of Gritstone Oncology, a public biopharmaceutical company, and NextCure, Inc., a public biopharmaceutical company. Dr. Jones holds a B.S. in biology from Juniata College and a Ph.D. in microbiology from the University of Pittsburgh. We believe that Dr. Jones is qualified to serve on our Board due to her broad knowledge of the life sciences industry and significant experience in pharmaceutical drug discovery and business development.

THE BOARD OF DIRECTORS RECOMMENDS A VOTE “ FOR ” THE ELECTION OF EACH OF THE NAMED NOMINEES.

The Audit Committee of our Board has selected Ernst & Young LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2020 and has further directed that management submit the selection of our independent registered public accounting firm for ratification by the stockholders at the annual meeting. Ernst & Young LLP has audited our financial statements for each of our fiscal years since the fiscal year ended December 31, 2017. Representatives of Ernst & Young LLP are expected to be present at the virtual annual meeting. During the webcast, they will have an opportunity to make a statement if they so desire and will be available to respond to appropriate questions submitted online.

Neither our bylaws nor other governing documents or law require stockholder ratification of the selection of Ernst & Young LLP as our independent registered public accounting firm. However, the Audit Committee is submitting the selection of Ernst & Young LLP to the stockholders for ratification as a matter of good corporate practice. If the stockholders fail to ratify the selection, the Audit Committee will reconsider whether or not to retain Ernst & Young LLP. Even if the selection is ratified, the Audit Committee, in its discretion, may direct the appointment of a different independent registered public accounting firm at any time during the year if the Audit Committee determines that such a change would be in our best interests and our stockholders’ best interest.

The affirmative vote of the holders of a majority of the shares of our common stock present online or represented by proxy at the annual meeting and entitled to cast votes on this proposal will be required to ratify the selection of Ernst & Young LLP for our fiscal year ending December 31, 2020. Abstentions will not be counted as votes cast on this proposal. No broker non-votes are expected to exist in connection with this proposal.

The following table provides information regarding the fees incurred by Ernst & Young LLP during the years ended December 31, 2019 and 2018. The Audit Committee approved all of the fees described below incurred since our initial public offering in August 2015.

The Audit Committee has adopted policies and procedures for the pre-approval of audit and non-audit services provided by our independent registered public accounting firm, Ernst & Young LLP. The policy generally requires pre-approval for specified services in the defined categories of audit services, audit-related services and tax services up to specified amounts. Pre-approval may also be given as part of the Audit Committee’s approval of the scope of the engagement of the independent registered public accounting firm or on an individual explicit case-by-case basis before the independent registered public accounting firm is engaged to provide each service. The pre-approval of services may be delegated to one or more of the Audit Committee’s members, but the decision must be reported to the full Audit Committee at its next scheduled meeting.

The Audit Committee will review both audit and non-audit services performed by Ernst & Young LLP and the fees charged for such services on at least an annual basis. Among other things, the Audit Committee will review

non-audit services proposed to be provided by Ernst & Young LLP and pre-approve such services only if they are compatible with maintaining Ernst & Young LLP’s status as an independent registered public accounting firm. All services provided by Ernst & Young LLP in 2019 and 2018 were pre-approved by our Board or the Audit Committee after review of each of the services proposed for approval.

THE BOARD OF DIRECTORS RECOMMENDS A VOTE “ FOR ” THE RATIFICATION OF THE SELECTION OF ERNST & YOUNG LLP AS OUR INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FOR THE FISCAL YEAR ENDING DECEMBER 31, 2020.

Presently, our Amended and Restated Certificate of Incorporation authorizes the issuance of 75,000,000 shares of common stock, par value $0.00001 per share. As of March 31, 2020, the Company had 45,918,616 shares of common stock issued and outstanding. Also, as of December 31, 2019, 14,690,571 shares of common stock were reserved for issuance under our equity compensation plans. In total, 14,390,813 shares of authorized common stock remain available for issuance.

In March 2020, the Board determined that the increase in the number of shares of common stock was advisable and in the best interest of the Company and its stockholders and unanimously approved an amendment to Article Four of our Amended and Restated Certificate of Incorporation to increase the authorized number of shares of common stock from 75,000,000 to 150,000,000 shares, subject to stockholder approval of the amendment.

The affirmative vote of a majority of the outstanding shares of our common stock as of the Record Date will be required to approve the amendment of our Amended and Restated Certificate of Incorporation. Abstentions will have the effect of a vote “Against” this proposal. This is a routine proposal and therefore we do not expect any broker non-votes.

Any additional authorized shares of common stock will be identical to the shares of common stock now authorized and outstanding. The proposed increase in the number of shares of common stock will not change the number of shares of stock outstanding, have any immediate dilutive effect or change the rights of current holders of our common stock. However, to the extent that the additional authorized shares of common stock are issued in the future, they may decrease existing stockholders’ percentage equity ownership and, depending on the price at which they are issued, could be dilutive to the voting rights of existing stockholders and may dilute earnings and book value on a per share basis. Stockholders do not have preemptive rights to acquire the common stock authorized by this amendment, which means that current stockholders do not have a prior right to purchase any new issue of capital stock in order to maintain their proportionate ownership of our common stock.

In addition to dilution, the availability of additional shares of common stock for issuance could, under certain circumstances, discourage or make more difficult any efforts to obtain control of us. The Board is not aware of any actual or contemplated attempt to acquire control of the Company and this proposal is not being presented with the intent that it be used to prevent or discourage any acquisition attempt. However, nothing would prevent the Board from taking any actions that it deems consistent with its fiduciary duties.

If our Amended and Restated Certificate of Incorporation were approved, Article Four, Section A of the Company’s Amended and Restated Certificate of Incorporation would read in its entirety as follows:

“A. The Company is authorized to issue two classes of stock to be designated, respectively, Common Stock and Preferred Stock. The total number of shares that the Company is authorized to issue is 160,000,000 shares, 150,000,000 shares of which shall be Common Stock (the “Common Stock”), and 10,000,000 shares of which shall be Preferred Stock (the “Preferred Stock”). The Common Stock shall have a par value of $0.00001 per share and the Preferred Stock shall have a par value of $0.00001 per share.”

If the proposed amendment to increase the number of authorized shares of common stock is approved by our stockholders, the amendment will become effective immediately upon the filing of a Certificate of Amendment to our Amended and Restated Certificate of Incorporation with the Secretary of State of the State of Delaware, which we expect to file promptly after the annual meeting. If the proposed amendment is not approved by our stockholders, the number of authorized shares of Common Stock will remain unchanged.

The Board believes that additional authorized shares of common stock would give the Company the necessary flexibility to issue shares for various corporate purposes, including, in particular, capital-raising or financing

transactions, and enable the Company to take timely advantage of market conditions and opportunities. Other corporate purposes for which the additional authorized shares could be used include, but are not limited to, potential strategic transactions, including mergers, acquisitions, and other business combinations; future development of the Company’s pipeline of products, future grants and awards under equity compensation plans; stock splits and stock dividends; and other general corporate working capital needs. The Board currently has no specific designated purpose for the increase in authorized shares of common stock. As a general matter, the Board would be able to issue the additional authorized shares of common stock at its discretion from time to time, subject to and as limited by, rules or listing requirements of the Nasdaq or any other then applicable securities exchange, and without further action or approval of the Company’s stockholders. The discretion of the Board, however, would be subject to any other applicable rules and regulations in the case of any particular issuance or reservation for issuance that might require our stockholders to approve such transaction.

Because our cash flow from operations has been negative, if the stockholders do not approve this proposal, the Board may be precluded from pursuing a wide range of potential corporate opportunities that might raise necessary cash or otherwise be in the best interests of the Company and the best interests of our stockholders. This could have a material adverse effect on our business and prospects. We would also face substantial challenges in hiring and retaining employees at all levels, including our executive leadership team, in the near term.

THE BOARD OF DIRECTORS RECOMMENDS THAT STOCKHOLDERS VOTE “ FOR” THE RESOLUTION TO AMEND OUR AMENDED AND RESTATED CERTIFICATION OF INCORPORATION TO INCREASE THE NUMBER OF SHARES OF AUTHORIZED COMMON STOCK FROM 75,000,000 TO 150,000,000.

The Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (the “Dodd-Frank Act”) enables our stockholders to vote to approve, on an advisory, non-binding basis, the compensation of our named executive officers as disclosed in this Proxy Statement in accordance with the SEC’s rules, commonly known as a “Say-on-Pay” vote. Accordingly, we are seeking a non-binding, advisory vote to approve the compensation of our named executive officers as described in the “Compensation Discussion and Analysis” section of this proxy statement and the compensation tables and accompanying narrative disclosures that follow.

Our Compensation Committee and the Board believe that the information provided in the “Compensation Discussion and Analysis” section of this Proxy Statement, compensation tables and accompanying narrative disclosures demonstrates that our executive compensation program is designed appropriately, emphasizes pay for performance and aligns management’s interests with our stockholders’ interests to support long-term value creation.

Accordingly, our Board recommends that stockholders vote “FOR” the following resolution:

While the vote on this resolution is advisory and not binding on us, the Compensation Committee, or our Board, the Compensation Committee and our Board values thoughtful input from stockholders and will consider the outcome of the vote on this resolution when considering future executive compensation decisions. Our Board has adopted a policy of providing for annual advisory votes from stockholders on executive compensation. Unless our Board modifies its policy on the frequency of future Say-on-Pay advisory votes, the next Say-on-Pay advisory vote will be held at the 2021 annual meeting of stockholders.

THE BOARD OF DIRECTORS RECOMMENDS THAT STOCKHOLDERS VOTE, ON A NON-BINDING ADVISORY BASIS, “ FOR” THE RESOLUTION TO APPROVE THE COMPENSATION OF OUR NAMED EXECUTIVE OFFICERS.

The following table sets forth certain information regarding the ownership of our common stock as of April 20, 2020, by: (i) each of our directors; (ii) each of our named executive officers; (iii) all of our executive officers and directors as a group; and (iv) all those known by us to be beneficial owners of more than 5% of our common stock. On April 20, 2020, there were 45,922,598 shares of common stock outstanding and entitled to vote. Unless otherwise indicated below, the address for each beneficial owner listed is c/o CytomX Therapeutics, Inc., at 151 Oyster Point Boulevard, Suite 400, South San Francisco, California.

Section 16(a) of the Exchange Act requires our directors and executive officers, and persons who beneficially own more than 10% of a registered class of our equity securities, to file with the SEC initial reports of ownership and reports of changes in ownership of our common stock and other equity securities. Officers, directors and greater than 10% beneficial owners are required by SEC regulations to furnish us with copies of all Section 16(a) forms they file.

To our knowledge, based solely on our review of Forms 3, 4 and 5, and any amendments thereto, furnished to us or written representations, we believe that during the fiscal year ended December 31, 2019, all filing requirements applicable to our executive officers and directors under the Exchange Act were met in a timely manner.

We have adopted a written related party transactions policy, which sets forth the policies and procedures for the review and approval or ratification of related party transactions. The policy covers, with certain exceptions set forth in Item 404 of Regulation S-K promulgated under the Exchange Act, any transaction, arrangement or relationship, or any series of similar transactions, arrangements or relationships, in which we were or are to be a participant, where the amount involved exceeds $120,000 and a related party had, has or will have a direct or indirect material interest, including indebtedness, guarantees of indebtedness and employment by us of a related party.

A related party transaction reviewed under the policy will be considered approved or ratified if it is authorized by the Audit Committee of our Board or the chairperson of the Audit Committee in accordance with the standards set forth in the policy after full disclosure of the related party’s interests in the transaction. As appropriate for the circumstances, the Audit Committee or the chairperson of the Audit Committee, as applicable, shall review and consider:

Since January 1, 2019, we have followed all policies and procedures in reviewing, approving and ratifying related person transactions.

We describe below transactions and series of similar transactions since January 1, 2019, to which we were a party or will be a party, in which (i) the amounts involved exceeded or will exceed $120,000 and (ii) any of our directors, executive officers, holders of more than 5% of our capital stock or any member of their immediate family had or will have a direct or indirect material interest, other than compensation arrangements with directors and executive officers, which are described where required in the sections titled “Director Compensation” and “Executive Compensation,” respectively, in this Proxy Statement.

We have entered employment-related agreements with our executive officers. See section titled “Executive Compensation,” respectively, in this proxy statement for more information regarding each of these agreements and compensation of our directors and executive officers.

We have entered into indemnification agreements with each of our directors and executive officers. These agreements, among other things, require us or will require us to indemnify each director and executive officer to the fullest extent permitted by Delaware law, including indemnification of expenses such as attorneys’ fees, judgments, fines and settlement amounts incurred by the director or executive officer in any action or proceeding, including any action or proceeding by or in right of us, arising out of the person’s services as a director or executive officer.

Dr. Hannah was appointed to the position of senior vice president and chief medical officer of the Company on February 3, 2020. Prior to her appointment, we had entered into a consulting agreement with Dr. Hannah on October 21, 2019, pursuant to which she advised us on matters relating to clinical development, safety and pharmacovigilance, and was reimbursed at a rate of $450 per hour. We paid Alison Hannah a total of $83,362 in fees during the term of her consultancy, which ended upon her appointment as a full-time employee.

The following sets forth information about our directors as of April 20, 2020.

The following are brief biographies of our current directors, including the three nominees for election at the 2020 Annual Meeting of Stockholders to a new term of office and each director whose current term of office continues through the 2020 Annual Meeting of Stockholders.

Dr. McCarthy joined CytomX in December 2010 as our chief business officer and became a member of our board of directors and our president and chief executive officer in August 2011. On January 1, 2019, Dr. McCarthy became chairman of our board of directors. Dr. McCarthy has more than twenty years of experience in the biotechnology industry encompassing roles in R&D, business development, financing and general management. Following completion of his post-doctoral training at the DNAX Research Institute (now Merck Palo Alto), Dr. McCarthy held research leadership and program management roles at Millennium Pharmaceuticals where he managed biologics discovery programs. From Millennium, Dr. McCarthy joined SGX Pharmaceuticals, where he spearheaded a wide range of large pharma partnerships as vice president business development and helped drive a strategic reorientation of the company from a platform business model to product-focused oncology company, leading to a successful initial public offering in 2006. Immediately prior to joining CytomX, Dr. McCarthy was a transactional partner at Pappas Ventures from April 2006 to December 2010, where he was responsible for investments in therapeutic, medical device and molecular diagnostic companies. Dr. McCarthy is an author on multiple peer reviewed scientific publications, issued patents and filed patent applications. He received a B.Sc. in biochemistry and pharmacology at King’s College, University of London; an MBA from the Rady School of Management at the University of California San Diego; and a D.Phil. in cancer biology from St. John’s College, University of Oxford. Dr. McCarthy currently serves as a member of the Board of Directors of the California Life Sciences Association. We believe Dr. McCarthy is qualified to serve on our Board based on his management experience in the life sciences sector, including at CytomX, his deep knowledge of the industry, and his strategic and business development expertise.

Dr. Scarlett has served as a member of our Board since June 2016. Mr. Scarlett currently serves as chief executive officer, president and a member of the board of directors of Geron Corporation. Since February 2015, Dr. Scarlett has also served as a member of the board of directors of Chiasma, Inc. Prior to joining Geron in 2011, Dr. Scarlett served as president, chief executive officer and a member of the board of directors of Proteolix, Inc., from February 2009 until its acquisition by Onyx Pharmaceuticals, Inc., in November 2009. From February 2002 until its acquisition by Ipsen, S.A., in October 2008, Dr. Scarlett served as founder, chief executive officer and a member of the board of directors of Tercica, Inc., and also as its president from February 2002 through February 2007. From March 1993 to May 2001, Dr. Scarlett served as president and chief executive officer of Sensus Drug Development Corporation. In 1995, he co-founded Covance Biotechnology Services, Inc., and served as a member

of its board of directors from inception to 2000. From 1991 to 1993, Dr. Scarlett headed the North American Clinical Development Center and served as senior vice president of medical and scientific affairs at Novo Nordisk Pharmaceuticals, Inc. Dr. Scarlett holds a B.A. in chemistry from Earlham College and an M.D. from the University of Chicago, Pritzker School of Medicine. We believe Dr. Scarlett is qualified to serve on our Board based on his significant industry experience, medical background and extensive management experience in the life sciences sector.

Mr. Gluck’s biographical information is included above under “Proposal No. 1 Election of Directors.”

Mr. Young’s biographical information is included above under “Proposal No. 1 Election of Directors.”

Dr. Jones’ biographical information is included above under “Proposal No. 1 Election of Directors.”

Dr. Fuchs has served as a member of our Board since October 2017. Dr. Fuchs is an internationally recognized expert in gastrointestinal cancers, cancer epidemiology and cancer drug development, and conducts research assessing novel therapeutic approaches in oncology. Dr. Fuchs is the Richard Sackler and Jonathan Sackler Professor of Medicine, Director of the Yale Cancer Center and Physician-in-Chief of the Smilow Cancer Hospital since January 2017. He was previously professor of medicine at Harvard Medical School and chief of the gastrointestinal oncology division and the Robert T. and Judith B. Hale Chair in Pancreatic Cancer at Dana-Farber Cancer Institute from July 2007 to December 2017. Dr. Fuchs received his medical degree from Harvard Medical School in 1986. He completed his medical residency at Brigham and Women’s Hospital, where he also served as chief medical resident, and completed his medical oncology fellowship at Dana-Farber Cancer Institute. In 1994, he received his M.P.H. from Harvard School of Public Health. We believe that Dr. Fuchs is qualified to serve on our Board due to his deep medical experience and service on the boards of directors of several cancer centers.

Mr. Meyers has served as a member of our Board since December 2018. Mr. Meyers has served as a Senior Advisor to Gilead Sciences since his retirement from Gilead in February 2018. Prior to his advisory role, Mr. Meyers most recently served as Gilead’s executive vice president of worldwide commercial operations where he was responsible for all commercial activities including pricing and market access in North America, Europe, Middle East, Australia and Japan. Over his 22-year career at Gilead, Mr. Meyers led some of the most important and successful product launches in the history of the biopharmaceutical industry, most notably in the therapeutic areas of HCV and HIV. Prior to joining Gilead, Mr. Meyers held positions of increasing responsibility in sales, training, marketing and management with Zeneca Pharmaceuticals and Astra USA. Mr. Meyers currently serves on the Board of Arbutus Biopharma Corporation, a public biopharmaceutical company focused on commercializing a cure for patients suffering from chronic hepatitis B infection. Mr. Meyers holds a B.S. in Economics from Boston College. We believe that Mr. Meyers is qualified to serve on our Board due to his worldwide commercial leadership experience within the biotechnology industry.

Ms. Gilbert’s appointment to our Board was effective on April 27, 2020. Currently, Ms. Gilbert serves as Senior Vice President, Corporate Development and Chief Administrative Officer at Ironwood Pharmaceuticals, Inc. having joined the company in 2008 as Vice President and General Counsel. At Ironwood, Ms. Gilbert oversees corporate and business development, legal, compliance and government affairs. Prior to this, Ms. Gilbert served in several roles at Cubist Pharmaceuticals, Inc. (acquired by Merck), including as Vice President, Deputy General Counsel, Assistant Secretary and Assistant General Counsel from 2002 to 2007. From 1999 to 2002, Ms. Gilbert held the position of

Corporate Counsel at Genzyme Corporation. Ms. Gilbert began her career at the law firm of Skadden, Arps, Slate, Meagher & Flom LLP, where, serving as Corporate Associate from 1995 to 1998, she specialized in mergers and acquisitions and securities law. Ms. Gilbert currently serves on the board of Arcutis Biotherapeutics, a public biopharmaceutical company, and formerly served on the boards of Dermira, Inc. (acquired by Eli Lilly and Company) and Achaogen, Inc. Ms. Gilbert received a J.D. from Northwestern University School of Law and a B.A. from Tufts University. We believe that Ms. Gilbert is qualified to serve on our Board due to her broad knowledge of the life sciences industry and significant experience in business development, corporate strategy, law and compliance.

The Board met seven times during the fiscal year ended December 31, 2019. The Audit Committee of the Board met four times, the Compensation Committee of the Board met eight times and the Nominating and Corporate Governance Committee of the Board met four times. Each member of the Board, other than Ms. Gilbert, who joined the Board in April 2020, attended at least 75% of the aggregate number of meetings of our Board and of the committees on which he or she served, that were held during the period of the last fiscal year and during which they served on the Board or such committees.

Our Board has a policy of encouraging director attendance at our annual meetings of stockholders, but attendance is not mandatory. Our Board and management team encourage all of our directors to attend the virtual 2020 Annual Meeting of Stockholders. All of our directors attended the 2019 Annual Meeting, except Mr. Young who was unable to attend for personal reasons, and Ms. Gilbert, who joined the Board in April 2020.

The Board has documented our governance practices in our corporate governance guidelines to assure that the Board will have the necessary authority and practices in place to review and evaluate our business operations as needed and to make decisions that are independent of our management. The guidelines are also intended to align the interests of directors and management with those of our stockholders. The corporate governance guidelines set forth certain practices the Board will follow with respect to Board composition, Board committees, Board nomination, director qualifications and evaluation of the Board and committees. The corporate governance guidelines and the charter for each committee of the Board may be viewed at www.cytomx.com .

Our bylaws and Corporate Governance Guidelines provide our Board with flexibility to combine or separate the positions of chairman of the Board and chief executive officer and/or the implementation of a lead director in accordance with its determination that utilizing one or the other structure would be in the best interests of the Company. The position of chief executive officer and chairman of the Board is currently held by Sean A. McCarthy, D. Phil. The Board also appointed Matthew P. Young to serve as Lead Independent Director of the Board. In that role, Mr. Young presides over the executive sessions of the Board in which Dr. McCarthy does not participate, serves as a liaison to Dr. McCarthy and management on behalf of the Board and performs such other duties and exercises such other powers as may from time to time be assigned by the bylaws or the Board.

Our Board has concluded that our current leadership structure is appropriate at this time. However, our Board will continue to periodically review our leadership structure and may make such changes in the future as it deems appropriate.

The Board monitors and assesses key business risks directly through deliberations of the Board and also by way of delegation of certain risk oversight functions to be performed by committees of the Board. The Board regularly reviews and assesses, among other matters, the following important areas that present both opportunities and risk to the Company’s business:

The discussion above of risk oversight matters reviewed by the Board is intended to be illustrative only and not a complete list of all important matters reviewed and considered by the Board in providing oversight and direction for the Company’s senior management and business.

The risk oversight function of the Board is also administered through various Board committees. The Audit Committee oversees the management of financial, accounting, internal controls, disclosure controls and the engagement arrangement and regular oversight of the independent auditors. The Audit Committee also periodically reviews the Company’s investment policy for its cash reserves and fraud monitoring practices and procedures, including the maintenance and monitoring of a whistleblower hotline.

The Compensation Committee is responsible for the design and oversight of the Company’s compensation programs. The Compensation Committee also regularly reviews and reports to the Board on succession planning for the chief executive officer and certain other select senior management positions.

The Nominating and Corporate Governance Committee periodically reviews the Company’s corporate governance practices, including certain risks that those practices are intended to address. The Nominating and Corporate Governance Committee periodically reviews the composition of the Board to help ensure that a diversity of skills and experiences is represented by the members of the Board taking into account the stage of growth of the Company and its strategic direction, as well as identifies, evaluates and nominates qualified candidates.

In carrying out their risk oversight functions, the Board and its committees routinely request and review management updates, reports from the independent auditors and legal and regulatory advice from outside experts, as appropriate, to assist in discerning and managing important risks that may be faced by the Company. The Board is committed to continuing to ensure and evolve its risk oversight practices as appropriate given the stage of the Company’s evolution as a drug development Company and the fast-paced changes in the biopharmaceutical industry.

Under the rules of The Nasdaq Stock Market LLC (“Nasdaq”), independent directors must comprise a majority of a listed company’s board of directors within twelve months from the date of listing. In addition, Nasdaq rules require that, subject to specified exceptions, each member of a listed company’s audit, compensation and nominating and corporate governance committees be independent. Audit committee members must also satisfy additional independence criteria set forth in Rule 10A-3 under the Exchange Act, and in Nasdaq Rule 5605(c)(2)(A). Under Nasdaq rules, a director will only qualify as an “independent director” if, in the opinion of that company’s board of directors, that person does not have a relationship that would interfere with the exercise of independent judgment in carrying out the responsibilities of a director.

To be considered independent for purposes of Rule 10A-3, a member of an audit committee of a listed company may not, other than in his or her capacity as a member of the audit committee, the board of directors or any other board committee, accept, directly or indirectly, any consulting, advisory or other compensatory fee from the listed company or any of its subsidiaries or be an affiliated person of the listed company or any of its subsidiaries.

Our Board has undertaken a review of its composition, the composition of its committees and the independence of each director. Based upon information requested from and provided by each director concerning his or her background, employment and affiliations, including family relationships, our Board determined that none of our directors, other than Dr. McCarthy, has a relationship that would interfere with the exercise of independent judgment in carrying out the responsibilities of a director and that each of these directors is “independent” as that term is defined under the Nasdaq rules. Dr. McCarthy is not considered independent because he is an employee of CytomX. Our Board determined that Charles S. Fuchs, M.D., M.P.H., a member of our Compensation Committee, Frederick W. Gluck, a member of our Nominating and Corporate Governance Committee and Compensation Committee, Matthew P. Young, a member of our Audit Committee, John Scarlett, M.D., a member of our Audit Committee and Compensation Committee, James R. Meyers, a member of our Audit Committee and Nominating and Corporate Governance Committee, Elaine V. Jones, Ph.D., a member of our Nominating and Corporate Governance Committee, and Halley Gilbert, appointed to our Board in April 2020, satisfy the independence standards for such committees established by applicable SEC and the Nasdaq rules, including, with respect to Mr. Meyers, Dr. Scarlett and Mr. Young, the heightened independence criteria applicable to the Audit Committee, as set forth in Rule 10A-3 and Nasdaq Rule 5605. In making these determinations, our Board considered the relationships that each non-employee director has with us and all other facts and circumstances our Board deemed relevant in determining their independence, including the beneficial ownership of our capital stock by each non-employee director.

Our Board has three regularly constituted committees: an Audit Committee, a Compensation Committee and a Nominating and Corporate Governance Committee. The following table provides current membership information and meeting information as of December 31, 2019 for each of the Board committees:

Below is a description of each committee of our Board.

The Audit Committee of the Board oversees our corporate accounting and financial reporting process. For this purpose, the Audit Committee performs several functions. The responsibilities of the Audit Committee include, among other things:

The Audit Committee has the power to investigate any matter brought to its attention within the scope of its duties and will have the authority to retain counsel and advisors to fulfill its responsibilities and duties.

The Audit Committee has the authority to retain special legal, accounting or other consultants to advise the committee as it deems necessary, at the Company’s expense, to carry out its duties and to determine the compensation of any such advisors.

The members of the Audit Committee are Matthew P. Young, John Scarlett, M.D. and James R. Meyers. Mr. Young serves as the chairperson of the committee. Our Board has determined that each of Mr. Young, Dr. Scarlett and Mr. Meyers are “independent” for Audit Committee purposes as that term is defined in the applicable rules of the SEC and The Nasdaq Global Select Market. Our Board has designated Mr. Young as an “audit committee financial expert” as defined under the applicable rules of the SEC and has determined that Mr. Young has the requisite financial sophistication as defined under the applicable rules and regulations of Nasdaq. The Audit Committee has adopted a written Audit Committee charter that satisfies the applicable standards of the SEC and Nasdaq, and which is available on our corporate website at www.cytomx.com .

The Compensation Committee of the Board reviews the type and level of compensation for directors, officers, employees and compensation consultants of the Company, recommends compensation actions to the Board and administers the variable compensation programs to be adopted by the Company. The responsibilities of the Compensation Committee include, among other things:

The Compensation Committee has the power to investigate any matter brought to its attention within the scope of its duties and will have the authority to retain counsel and advisors to fulfill its responsibilities and duties.

The Compensation Committee has the sole authority to retain or replace, at the Company’s expense, any independent counsel, compensation and benefits consultants and other outside experts or advisors as the committee believes to be necessary or appropriate. The committee may also utilize the services of the Company’s regular legal counsel or other advisors to the Company. The Compensation Committee has engaged Radford, an Aon Hewitt Company, since 2015 as a compensation consultant to evaluate non-employee director compensation and compensation in comparison to industry peers. For additional information on the role of the compensation consultant and the Chief Executive Officer please see “Compensation Discussion and Analysis – Process for Setting Executive Compensation.”

The members of the Compensation Committee are John Scarlett, M.D., Frederick W. Gluck and Charles S. Fuchs, M.D., M.P.H. Dr. Scarlett serves as the chairperson of the committee. Our Board has determined that each member of the Compensation Committee is an independent director for Compensation Committee purposes as that term is defined in the applicable Nasdaq rules, and is a “non-employee director” within the meaning of Rule 16b-3(d)(3) promulgated under the Exchange Act. The Compensation Committee has adopted a written Compensation Committee charter that satisfies the applicable standards of the SEC and Nasdaq, and which is available on our corporate website at www.cytomx.com .

The responsibilities of the Nominating and Corporate Governance Committee include, among other things:

The Nominating and Corporate Governance Committee has the power to investigate any matter brought to its attention within the scope of its duties and will have the authority to retain counsel and advisors to fulfill its responsibilities and duties.

The Nominating and Corporate Governance Committee may retain, at the Company’s expense, any independent counsel, experts or advisors that the committee believes to be desirable and appropriate. The committee may also use the services of the Company’s regular legal counsel or other advisors to the Company.

The Nominating and Corporate Governance Committee is comprised of Frederick W. Gluck, Elaine V. Jones, Ph.D., and James R. Meyers. Mr. Gluck serves as the chairperson of the committee. Our Board has determined that Mr. Gluck, Dr. Jones and Mr. Meyers are independent directors for Nominating and Corporate Governance Committee purposes as that term is defined in the applicable rules of The Nasdaq Global Select Market. The Nominating and Corporate Governance Committee has adopted a written committee charter that satisfies the applicable standards of the SEC and Nasdaq, and which is available on our corporate website at www.cytomx.com .

The Nominating and Corporate Governance Committee reviews candidates for director nominees in the context of the current composition of the Board, our operating requirements and the long-term interests of stockholders. In conducting this assessment, the Nominating and Corporate Governance Committee considers diversity, age, skills and such other factors as it deems appropriate given our current needs and those of our Board to maintain a balance of knowledge, experience and capability. The committee also periodically reviews the overall effectiveness of the Board, including Board attendance, level of participation, quality of performance, self-assessment reviews and any relationships or transactions that might impair director independence. In the case of new director candidates, the committee will also determine whether the nominee must be independent for Nasdaq purposes, which determination is based upon applicable Nasdaq listing standards, applicable SEC rules and regulations and the advice of counsel, if necessary. The committee may also use its network of contacts to compile a list of potential candidates and engage, if it deems appropriate, a professional search firm. The committee conducts any appropriate and necessary inquiries into the backgrounds and qualifications of possible candidates after considering the function and needs of the board. The committee meets to discuss and consider such candidates’ qualifications and then selects a nominee for recommendation to the Board by majority vote.

The Nominating and Corporate Governance Committee will consider for nomination any qualified director candidates recommended by our stockholders. Any stockholder who wishes to recommend a director candidate is directed to submit in writing the candidate’s name, biographical information, relevant qualifications and other information required by our bylaws to our Secretary at our principal executive offices before the deadline set forth in our bylaws. All written submissions received from our stockholders will be reviewed by the Nominating and Corporate Governance Committee at the next appropriate meeting. The Nominating and Corporate Governance Committee will evaluate any suggested director candidates received from our stockholders in the same manner as recommendations received from management, committee members or members of our Board.

The Board will consider any written or electronic communication from our stockholders to the Board, a committee of the Board or any individual director. Any stockholder who wishes to communicate to the Board, a committee of the Board or any individual director should submit written or electronic communications to our Secretary at our principal executive offices, which shall include contact information for such stockholder. All communications from stockholders received shall be forwarded by our Secretary to the Board, a committee of the Board or an individual director, as appropriate, on a periodic basis, but in any event no later than the board of director’s next scheduled meeting. The Board, a committee of the Board, or individual directors, as appropriate, will consider and review carefully any communications from stockholders forwarded by our Secretary.

There were no material changes to the procedures by which stockholders may recommend nominees to our Board in 2019.

There are no family relationships among any of our directors or executive officers.

We have adopted a code of business conduct and ethics that applies to all employees, including our principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions. The code of business conduct and ethics is available on our website at www.cytomx.com . Amendments to, and waivers from, the code of business conduct and ethics that apply to any director, executive officer or persons performing similar functions will be disclosed at the website address provided above and, to the extent required by applicable regulations, on a Current Report on Form 8-K filed with the SEC.

The Company does not permit our employees or directors to engage in hedging transactions with respect to Company equity securities.

The material in this report is not “soliciting material,” is not deemed “filed” with the SEC, and is not to be incorporated by reference into any filing of CytomX Therapeutics, Inc. under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended.

The Compensation Committee reviewed and discussed with management the “Compensation Discussion and Analysis” required by Item 402(b) of Regulation S-K and included in this Proxy Statement. Based on those reviews and discussions, the Compensation Committee recommended to the Board that the “Compensation Discussion and Analysis” be included in this Proxy Statement and incorporated by reference into the Company’s Annual Report on Form 10-K for the year ended December 31, 2019.

Consistent with the SEC’s disclosure requirements, the Compensation Committee has assessed our compensation programs for all employees. The Compensation Committee has overseen the establishment of a number of controls that address compensation-related risk and serve to mitigate such risk. As a result, the Compensation Committee has concluded that our compensation policies and practices do not encourage excessive or unnecessary risk-taking and are not reasonably likely to have a material adverse effect on the Company.

The following table presents information regarding the compensation paid to members of our Board, except for Sean A. McCarthy, D. Phil., who is also our president, chief executive officer and chairman of the Board. The compensation paid to Mr. McCarthy is set forth in the section titled “Executive Compensation” in this proxy statement. Dr. McCarthy was not entitled to receive additional compensation for his service as a director or chairman.

During 2019, our Board members were compensated pursuant to our non-employee director compensation program, which provides for cash and equity-based compensation for service on the Board and its committees. Under the program, our non-employee directors receive the following cash compensation for their service on the Board and its committees:

In 2019, the annual non-employee director cash compensation was paid quarterly in arrears. Under the program, non-employee directors also receive reimbursement for out-of-pocket expenses incurred in connection with attendance at meetings of our Board. In late 2019, the Compensation Committee of the Board voted to modify our compensation package for non-executive directors in order to align our practices with market conditions. Under the new compensation package, the compensation payable to the chairperson of the Compensation Committee and Nominating & Governance Committee of the Board was increased to $12,000 and $8,000 respectively, and the compensation payable to members of the Compensation Committee and Nominating & Governance Committee of the Board was increased to $6,000 and $4,000 respectively, with such modifications will take effect in fiscal 2020.

Under the program in 2019, new non-employee members of the Board are automatically granted an initial option to purchase 28,000 shares of our common stock on the date such person first becomes a non-employee director. The initial grant will vest with respect to 1/36 ^th of the shares subject to the option on each monthly anniversary measured from the grant date, such that 100% of the shares subject to the option will be fully vested and exercisable on the third anniversary of the vesting commencement date, subject to the director’s continued service to us through the applicable vesting date. In late 2019, in order to align our compensation practices with market conditions, the Compensation Committee of the Board voted to increase the grant of initial options to new non-employee members of the Board from 28,000 options to 40,000 options, subject to the same vesting schedule, with such modification to take effect in fiscal 2020.

On the date of each annual meeting of our stockholders, each non-employee director (other than any director receiving an Initial Grant on the date of such annual meeting) who is then serving as a non-employee director and who will continue as a non-employee director following the date of such annual meeting will automatically be granted an option to purchase 14,000 shares of our common stock. This annual grant will vest in full on the earlier of: (i) the date of the next annual meeting of our stockholders or (ii) the first anniversary of the date of grant, subject to the director’s continuous service to us through the applicable date. In late 2019, in order to align our compensation practices with market conditions, the Compensation Committee of the Board voted to increase this annual grant of options to non-employee members of the Board who continue to serve as non-employee directors following the date of an annual meeting, from 14,000 options to 20,000 options, subject to the same vesting schedule, with such modification to take effect in fiscal 2020.

The exercise price of all stock option grants is equal to the closing price of CytomX common stock as reported by the Nasdaq on the date of grant. In addition, upon a change in control, the vesting of all equity awards held by our non-employee directors will accelerate in full.

The following sets forth information about our executive officers as of April 20, 2020.

The following is biographical information as of April 20, 2020 for our executive officers.

Dr. McCarthy’s biographical information is included above under “Board of Directors and Corporate Governance.”

Dr. Kavanaugh joined CytomX in January 2015 as chief scientific officer and head of research and early development. Prior to joining CytomX, Dr. Kavanaugh was senior vice president and chief scientific officer of Five Prime Therapeutics from February 2009 to December 2014, holding multiple positions in research and development and led the growth of the company’s therapeutic pipeline. Before Five Prime, Dr. Kavanaugh served as vice president of Novartis Vaccines & Diagnostics, Inc. and executive director of Oncology Biologics in the Novartis Institutes of Biomedical Research. He joined Novartis in 2006 as part of the company’s acquisition of the Chiron Corporation, where he was vice president and head of antibody and protein therapeutics research. Dr. Kavanaugh received his medical doctorate from Vanderbilt University and his bachelor’s degree in molecular biochemistry and biophysics from Yale University. He completed training in internal medicine, cardiovascular disease and molecular and cellular biology at the University of California, San Francisco and the Cardiovascular Research Institute. Dr. Kavanaugh also currently serves as an attending staff physician at the San Francisco Veterans Administration Medical Center and as an associate clinical professor of medicine at UCSF.

Mr. Rowland joined CytomX in May 2018 as senior vice president, general counsel, secretary and chief compliance officer. Mr. Rowland brings 25 years of biotechnology and pharmaceutical industry legal counsel and transactional experience to CytomX. From August 2014 until February 2017, Mr. Rowland held the position of senior vice president, general counsel, secretary and chief compliance officer of Xencor, a clinical-stage biopharmaceutical company developing engineered monoclonal antibodies for the treatment of autoimmune diseases, asthma and allergic diseases and cancer. Prior to Xencor, Mr. Rowland, over a twelve-year career at Amylin Pharmaceuticals, held various roles, most recently as vice president and chief compliance officer and formerly, as vice president, general counsel and secretary. During his time as general counsel at Amylin, he directed all corporate legal and compliance affairs for the company including the launch of two pharmaceutical products. Prior to joining Amylin, Mr. Rowland served as vice president, secretary and general counsel for Alliance Pharmaceutical Corp. Mr. Rowland received his B.S. degree in economics and political science from Southern Methodist University, and his J.D. from Emory University School of Law.

Dr. Peterson joined CytomX in October 2019 as executive vice president and chief development officer. Prior to joining CytomX, from August 2016 to May 2019, Dr. Peterson was chief medical officer of immuno-oncology at

BeiGene Ltd., where she created and led a global oncology development organization with direct medical oversight and accountability of seven clinical assets in over thirty global trials in all phases of development in solid tumor indications. Prior to BeiGene, from August 2011 to July 2016, Dr. Peterson was vice president of clinical development at Medivation, where she was primarily responsible for the development of enzalutamide (XTANDI ^® ) and talazoparib (TALZENNA ^® ) in breast cancer. Previously, Dr. Peterson served as associate group medical director at Genentech from 2005 to 2011, where she was responsible for the development of early stage molecules targeting multiple major pathways in oncology. Prior to joining Genentech, Dr. Peterson was an Instructor of Medicine in Oncology at the University of Chicago, where she conducted translational research in tumor immunology in conjunction with Dr. Thomas F. Gajewski. She currently serves on the board of The American Society of Clinical Oncology’s (ASCO) Conquer Cancer Foundation. Dr. Peterson received her M.D. from Thomas Jefferson University and completed her residency in Internal Medicine at Northwestern Memorial Hospital and Fellowship in Hematology and Oncology at the University of Chicago. Dr. Peterson received her B.A. degree from Wesleyan University.

Alison L. Hannah, M.D. joined CytomX as senior vice president and chief medical officer in February 2020. Prior to being appointed as our chief medical officer, Dr. Hannah was a consultant for the Company from October 2019 up to February 2020, during which time she advised the Company on matters relating to clinical development, safety and pharmacovigilance. Dr. Hannah brings 30 years of experience in the development of investigational cancer therapies having most recently served as a consultant to nearly 30 pharmaceutical and biotechnology companies between 2000 and 2020. In this capacity, Dr. Hannah has successfully filed over 40 regulatory applications for First-in-Human clinical testing, and has played significant roles in the broad marketing approval of 8 therapeutics (talazoparib, enzalutamide, defibrotide, carfilzomib, sunitinib, toceranib, irinotecan and filgrastim) including extensive experience interacting with global health and regulatory authorities. Earlier in her career, Dr. Hannah held the role of Senior Medical Director at SUGEN, Inc. (acquired by Pharmacia & Upjohn, now Pfizer) where she had oversight of clinical development, clinical operations, and pharmacovigilance. At SUGEN, she specialized in the development of tyrosine kinase inhibitors, including sunitinib (SUTENT) for kidney cancer. Dr. Hannah began her career at Quintiles, a global contract research organization, where she specialized in overseeing early to registrational-stage oncology clinical trials. Dr. Hannah currently serves on the board of NeoGenomics, a publicly traded cancer diagnostic company. Dr. Hannah received her B.A in biochemistry and immunology from Harvard University and her M.D. from the University of Saint Andrews.

Mr. Campoy joined CytomX as its chief financial officer in March 2020. Mr. Campoy brings over 30 years of financial and leadership experience, the majority from publicly held companies within the healthcare and biopharmaceutical sectors. Prior to joining CytomX, Mr. Campoy held the position of chief financial officer at Alder BioPharmaceuticals, Inc., a public biopharmaceutical company acquired in October 2019 by Lundbeck A/S, from December 2018 to November 2019. During his time at Alder, Mr. Campoy led the finance organization and readied the company for commercial launch of its lead program, eptinezumab. Prior to Alder, Mr. Campoy was a partner at Think Forwards, a boutique financial consulting firm, from September 2017 to December 2018. Prior to his position at Think Forwards, Mr. Campoy held the role of vice president of finance at Allergan plc from July 2014 to November 2016. Prior to joining Allergan, Mr. Campoy held senior financial leadership positions at Eli Lilly and Company from 1996 to 2014, including most recently as chief financial officer of Eli Lilly Japan K.K. Mr. Campoy holds a Certified Management Accountant (CMA) designation. Mr. Campoy received his M.B.A. in Finance and Decision Information Systems from Indiana University and his B.S. in Management from Faculdade C.C. Administracao de Tupa, in São Paulo, Brazil.

The following Compensation Discussion and Analysis (“CD&A”) describes the philosophy, objectives, and structure of our executive compensation program for fiscal year 2019 (the year ending December 31, 2019.) This CD&A is intended to be read in conjunction with the tables following this section, which provide further historical compensation information for our 2019 named executive officers (“NEO’s”) identified below:

At our 2019 Annual Meeting of Stockholders, we conducted a stockholder advisory vote, or say-on-pay vote, on the compensation of the Named Executive Officers. At that meeting, our stockholders approved the compensation of our Named Executive Officers, as disclosed in our 2019 annual proxy statement, with approximately 97% of the votes cast in favor of the proposal. Given the strong support for our executive compensation program, we broadly maintained consistency in our executive compensation program from 2018 to 2019.

Our Compensation Committee oversees the design and administration of our executive compensation programs to ensure that they are tied directly to performance and that they reward our executive officers in a manner consistent with shareholder interests, competitive pay practices, and applicable requirements of regulatory bodies. Our executive compensation programs are structured to reward executives for achievement of our short and long-term strategic, operational, and financial goals.

The compensation paid or awarded to our executive officers is generally based on the assessment of each individual’s performance, as well as the performance of the Company as a whole, compared against individual and Company performance objectives established for the fiscal year. In addition, we seek to pay compensation at a level that is competitive with similarly situated companies within the life sciences industry.

As we continue to advance our discovery and clinical development pipeline based on our Probody ^® platform, it is imperative that we continue to retain, motivate and reward our highly skilled executive team.

Following are the key elements of our compensation program, which also apply to all of our employees:

The Compensation Committee regularly reviews industry best practices in executive compensation. We have implemented several strong governance standards with respect to our compensation programs and practices, as follows:

The overall objective of our compensation program is to support business objectives which will deliver shareholder value by attracting, retaining, and engaging the highest caliber of employees, including executive officers, while maintaining a fiscally responsible position in a highly competitive employment environment. Consistent with this overall objective, the goals of the executive compensation program are to:

To achieve these goals, we endeavor to maintain compensation plans that tie a substantial portion of executives’ overall compensation to key strategic, operational and financial goals that are supportive of our business strategy. The Compensation Committee also considers internal equity for all employees including, but not limited to, its executive officers, when determining compensation to ensure that the Company is fair in its compensation practices across all levels and to ensure that there is no discrimination in compensation practices.

Appointed by our Board, Compensation Committee members are independent of management and meet the NASDAQ listing standards for independence. The Compensation Committee acts on behalf of the Board to oversee the compensation policies and practices applicable to all our employees, including the administration of our equity plans and employee benefit plans. Typically, the Compensation Committee meets at least once quarterly and with greater frequency as necessary. The agenda for each meeting is usually developed by the Chair of the Compensation Committee, in consultation with the Chief Executive Officer and other members of management, as necessary, as well as our independent compensation consultant, Radford. The Compensation Committee also regularly meets in executive session without the presence of any employees. Historically, the Compensation Committee makes decisions related to executive compensation after conducting meetings during the fourth quarter of the calendar year and early in the first quarter of the ensuing year.

The Compensation Committee retained the services of Radford, an Aon Company, as an independent executive compensation consultant due to its extensive analytical and compensation expertise in the biotechnology and pharmaceutical industry. In this capacity, Radford has advised the Compensation Committee on compensation matters related to employee compensation, including the executive and director compensation programs. In fiscal 2019, Radford assisted the Compensation Committee with the following:

The Compensation Committee has the sole authority to engage and terminate Radford’s services, as well as to approve their compensation. Radford makes recommendations to the Compensation Committee, but has no authority to make compensation decisions on behalf of the Compensation Committee or the Company. Radford reports to the Compensation Committee and has direct access to the Chairman and the other members of the Compensation Committee. In addition to advice related to the executive and director compensation programs, Radford performs an analysis of all employee compensation for the Company.

The Compensation Committee conducted a specific review of its relationship with Radford in the past year and determined that Radford’s work for the Compensation Committee did not raise any conflicts of interest. Radford’s work has conformed to the independence factors and guidance provided by all applicable regulatory bodies.

To aid the Compensation Committee in its responsibilities, the Chief Executive Officer, with assistance from the Senior Vice President, Talent and Systems, regularly discusses compensation-related matters with the Chair of the Compensation Committee and then meets with the Compensation Committee to discuss these matters. The Chief Executive Officer also provides the Compensation Committee with quarterly recommendations relating to the level of achievement of our corporate goals. In addition, he presents to the Compensation Committee assessments of the performance and achievements for each of the NEOs (other than himself) for the prior year and makes recommendations regarding compensation arrangements for these individuals. The Compensation Committee gives considerable weight to the Chief Executive Officer’s performance evaluations of the other NEOs since he has direct knowledge of the criticality of their work, performance and contributions. The Compensation Committee does not

consult with any other executive officer with regard to its decisions. The Chief Executive Officer does not participate in the Compensation Committee’s or Board’s deliberations or decisions regarding his own compensation, which is approved by the independent members of the Board.

When considering executive compensation decisions, the Compensation Committee believes it is important to be informed as to current compensation practices of publicly held companies in the life sciences industry that are most similar to CytomX in terms of labor market competition, stage of product development, market capitalization and number of employees.

In fiscal 2019, as in prior years, the Compensation Committee referenced Radford’s market data for our peer group, along with other factors, in setting total compensation for our NEOs because industry competition for executive management is intense and the retention of our highly skilled leadership team is critical to our success. In determining market-competitive compensation for our NEOs, our Compensation Committee has not targeted a specific percentile relative to our compensation peer group for individual components of our total compensation, but rather generally used a range between the 25 ^th to 75 ^th percentiles as a reference point. Competitive market data regarding compensation is just one factor considered in determining the individual compensation of executives. Other important considerations include experience, individual performance, relative scope of responsibilities compared with external market positions surveyed, internal equity and retention.

In the latter half of 2018, based on the recommendation of Radford, the Compensation Committee determined that a defined peer group was appropriate for reference purposes when making 2019 executive officer compensation decisions. With the assistance of Radford, the Compensation Committee considered several factors in determining the appropriate companies to be named as peers, including:

Using our selected criteria, the following 20 companies were identified by the Compensation Committee and Radford as the defined peer group for 2019 executive compensation decisions:

The Compensation Committee’s objective is to have compensation programs and practices that are competitive with our peers and industry through a mix of cash (base salary and annual, performance-based cash incentive bonuses) and long-term incentives (equity awards).

Our executive compensation strategy does not include any formal policy or practice of dividing total compensation into specific, percentage-based cash and non-cash portions. Instead, the Compensation Committee uses its judgment, in consultation with Radford, in determining an appropriate mix of cash/equity, and short-term/long-

term performance-based compensation. The Compensation Committee believes that a substantial portion of pay for the executives should be “at risk” and incentivize long-term performance. Therefore, a majority of the annual compensation is at risk in the form of annual cash bonuses for short term performance and equity-based compensation to incentivize long term performance.

The balance among these components may change from year to year, based on corporate strategy and objectives, among other considerations. While there is no specific target mix of fixed versus variable, performance-based pay, for fiscal year 2019, approximately 85% of our Chief Executive Officer’s total direct compensation (consisting of base salary, target annual cash incentive award and the grant date fair value of equity awards) was performance-based and approximately 67% of the other NEO’s total direct compensation was performance-based, with the majority of compensation incentivizing long-term performance.

The Compensation Committee’s philosophy is to maintain base salaries at a competitive level sufficient to recruit and retain individuals possessing the skills and capabilities necessary to achieve the Company’s goals over the long-term. Base salaries serve to provide fixed cash compensation to our executive officers for performing their ongoing responsibilities. Base salaries for our executive officers are approved upon joining the Company by the Compensation Committee. Then on an annual basis they are reviewed and adjusted, as appropriate, by the Compensation Committee, in consultation with the Committee’s independent compensation consultant, Radford, and taking into consideration the Chief Executive Officer’s recommendations.

Such annual adjustments are based on factors that may include each executive officer’s:

We reviewed our NEOs’ base salaries referencing relevant compensation survey data from Radford, as well as taking into account our Chief Executive Officer’s assessment of individual executive performance (except with respect to his own salary). Based on this review, the Compensation Committee increased our NEOs’ base salaries in 2019, effective as of January 1, 2019, as set forth below:

Our annual cash incentive program is designed to reward all employees, including our executive officers, for the achievement of the Company’s annual corporate goals, as well as individual performance against annual individual goals. We believe that annual incentives hold executives accountable, reward executives based on actual business results and help create a “pay for performance” culture. There are no minimum or guaranteed bonus payments for employees, including the NEOs.

Under our cash incentive program, every employee, including each NEO, has an established annual performance-based incentive target, which is equal to a percentage of the employee’s base salary. This percentage increases as levels of responsibility increase.

Under our cash incentive program, each of our executive officers has an established annual incentive target which is equal to a percentage of their base salary (AIP). The actual earned annual incentive bonus, if any, is calculated based on corporate goal achievement and their individual goal achievement, multiplied by the AIP. For 2019, our NEOs had the following annual AIP cash incentive opportunities. The target AIP opportunities as a percentage of base salary were set at the same level as in 2018, except in the case of Ms. Peterson, who joined the Company in 2019.

At the beginning of each year, our Chief Executive Officer develops annual corporate goals with input from our executive management team. The goals relate to our strategic, operational and financial strategy. Each goal is assigned a weighting based on its importance and business value for CytomX and our shareholders. Each of the goals is established with criteria for getting to target goal accomplishment (100%) and criteria for obtaining stretch goal accomplishment (up to 150%). The Compensation Committee reviews and adjusts the proposed corporate goals and associated weightings as necessary and then recommends them to the Board for approval.

At the end of each performance year, the Chief Executive Officer presents to the Compensation Committee an assessment of the Company’s achievement against the pre-established annual corporate goals. The Compensation Committee reviews and discusses the corporate performance assessment, makes adjustments based on events or circumstances as it deems appropriate, and determines an overall corporate performance score representing the extent to which the Company achieved its overall objectives for the year. The corporate performance score can range up to 150% and is approved by the Board upon recommendation from the Compensation Committee. This corporate performance score serves as the basis for determining actual bonus payouts under the annual cash incentive plan.

For 2019 our corporate goals were based on the following:

In early 2020, the Board reviewed the Company’s accomplishments for 2019, and with the recommendation of the Compensation Committee, determined that the overall achievement percentage of the Company was 95% based on the total of each corporate goal accomplishment set forth above and with additional consideration given for other accomplishments, primarily with respect to two advancements made in the Company’s corporate alliance projects that were not covered by the established goals.

To further our commitment to a pay for performance culture, we allocate our annual bonus pool by applying a multiplier to the corporate performance score, based on each executive’s individual performance rating. At the end of each performance year, the Chief Executive Officer presents the Compensation Committee with an evaluation of each executive officer’s performance against pre-established annual individual goals, as well as a performance rating for each executive officer (other than himself) and a recommended annual incentive award amount for each executive officer (other than himself) based on the corporate performance score and the recommended individual performance rating multiplier. Our annual bonus awards are calibrated to pay out at 100% of overall target if an individual’s performance has been rated at the “Exceeds Expectations” level, consistent with our compensation philosophy. For those executives receiving an “Outstanding” individual performance rating, annual bonus payouts based on corporate performance score are increased by an additional 20%. Conversely, for those executives receiving a “Meets Expectation” rating, annual bonus payouts based on the corporate performance score are decreased by 10%. This element of our compensation philosophy is reflected across the entire organization and is not restricted to executive pay.

Dr. McCarthy’s performance is assessed based on leading the Company to achieve its corporate goals and he therefore received a performance rating of 95% for 2019. Each other NEO received a performance rating calibrated to reflect actual performance against expectations for their target performance. The NEOs either met or exceeded target performance expectations and received a performance rating at the level discussed above. Dr. Kavanaugh’s rating reflected his research and translational sciences leadership and contribution to advancing potential product candidates. Mr. Rowland’s performance rating reflected his planning across key legal functions and strengthening of the corporate compliance program. Dr. Peterson’s performance rating reflected her rapid assessment of and impact on the Company’s clinical development strategy upon her arrival at the Company in October 2019.

Based on the annual bonus determination process described above, the following table sets forth each executive’s target annual bonus percentage for 2019 and associated dollar value, as well as the annual bonus payments for each NEO for the 2019 performance year.

The long-term incentive component of our executive compensation program is equity-based and is dependent on the future success of the Company. In 2019 our equity program consisted of time-based options to purchase shares of our common stock, which require our common stock to appreciate in value before our executive officers realize any economic benefit from the options.

Our equity awards program is designed to:

In 2019, equity awards were comprised solely of stock option grants under our 2015 Plan and our 2019 Employment Inducement Plan which we implemented to enhance our ability to make strategically important employment decisions. The Compensation Committee views options as performance-based, and took into consideration the fact that most companies in our competitive market have equity programs in which options are the sole vehicle utilized. Such grants encourage employee ownership in CytomX, link pay with performance and align the interests of shareholders and employees. Our employees, including the NEOs, have an opportunity to realize value from equity-based awards through sustained, increasing price per share performance in our Common Stock. The Compensation Committee determines the size of any stock option grant according to each executive officer’s position. To do so, the Compensation Committee generally references the market data of our peer group companies provided by Radford. The Compensation Committee also takes into consideration each NEO’s recent performance history, his or her potential for future responsibility, and criticality of his or her work to the long-term success of the Company. Other factors may include equity awards previously granted, the amount of actual versus theoretical equity value per year that has been derived to date by the individual, the current actual value of unvested equity grants for each individual. The Compensation Committee has the discretion to give relative weight to each of these factors as it sets the size of the stock option grant to appropriately create an opportunity for reward based on increasing shareholder value.

CytomX’s standard vesting schedule for the first stock option grant awarded to newly hired employees, including executive officers, provides that 25% of the shares granted will vest on the first anniversary of the commencement of employment, with the balance vesting in equal monthly installments over the subsequent thirty-six (36) months, until option shares are fully vested, subject to the individual’s continued service to us through the applicable vesting date. Additional option grants made after an employee, including an executive officer, has provided services to the Company generally vest monthly from the date of grant over four years, subject to the individual’s continued service to us through the applicable vesting date.

The Compensation Committee grants equity awards to newly hired and existing executive officers. Our general policy is to grant stock options and other equity awards on fixed dates determined in advance, although there are occasions when grants are made on other dates.

All required approvals are obtained in advance of or on the actual grant date. Other than stock option grants to new hires, stock option grants to executive officers are generally approved once a year when compensation decisions are finalized (typically in January or February, in conjunction with a meeting of the Compensation Committee and Board.) If an executive officer is promoted, grants will normally be made at the time of such promotion, or, in rare circumstances, ad-hoc grants may be made for recognition of outstanding performance.

Other than Dr. Peterson, who received her initial grant of stock options upon joining the Company in October 2019, our NEOs received the following stock option grants in February 2019. Dr. Peterson’s new-hire grant amount was negotiated in connection with her commencement of employment.

In accordance with our equity grant practices, the exercise price for these stock option grants was equal to the closing price of our Common Stock as reported by the Nasdaq Global Select Market on the date of grant and the vesting schedule (except for new-hire grants) is monthly over four years from the date of grant, provided the employee continues to provide services to the Company.

On occasion, when the Compensation Committee wants to incentivize specific corporate objectives which have substantial uncertainty, option grants are made to the person with specific responsibility for such objective. These grants generally vest upon accomplishment of the specific objective, provided it occurs within certain time limits. If the objective does not occur within the established time limit, the grant expires. These equity grants also generally have a term of ten years from the date of grant. The Committee did not make any such grants to executive officers in 2019.

Dr. Humphrey and Mr. Rowland are reimbursed for the cost of commuting for work from New Jersey and Southern California, respectively. The Compensation Committee has considered these expenses and believes that in light of the highly competitive market in which the Company competes for talent and the unique talents and contributions of these executives, these expenses are in the best interests of our shareholders.

We have entered into written employment agreements with each of our NEOs that set forth the terms of their employment, including initial base salaries and eligibility to participate in the Company’s annual performance-based bonus program. In addition, each employment agreement includes restrictive covenants that would apply in the event of termination, which our Board believe helps protect our value. Each of our NEOs is employed “at will.” Dr. Humphrey’s offer letter, as amended, also provided that we will reimburse Dr. Humphrey’s travel expenses for her commute from her principal residence in New Jersey to our headquarters in South San Francisco, California. The Company has also agreed to reimburse Mr. Rowland for his travel expense reimbursements for his commute from his principal residence in San Diego to our headquarters in South San Francisco, California.

Our NEOs are entitled to certain severance and change in control benefits under the terms of our amended and restated severance agreements, their employment agreements and our equity plans, as further described under the sub-section entitled “Potential Payments Upon Termination or Change in Control.”

In 2019, following a review of competitive market practice, the severance and change of control agreement for Dr. McCarthy was amended and restated to increase the benefits payable to 18 months of salary, pro-rated annual target bonus and 18 months COBRA premiums in the event of a termination without cause or for good reason and to 24 months of salary, 24 months annual target bonus and 24 months COBRA premiums in the event of a termination without cause or for good reason within 60 days prior to or 12 months following a change in control. For other NEOs, the amended and restated agreements increased the amount payable to 12 months of base salary and COBRA benefits, plus an amount equal to the prorated bonus in the year terminated in the event of a termination without cause or for good reason. For the other NEOs, a termination without cause or for good reason within 60 days prior to or 12 months following a change in control increased the amount equal to 12 months of base salary, annual target bonus and COBRA benefits. Dr. Peterson’s amended and restated severance and change of control agreement provides for payouts similar to the other NEOs (other than Dr. McCarthy) in the event of a termination without cause or for good reason, but, for a termination without cause or for good reason within 60 days prior to or 12 months following a change in control, Dr. Peterson would receive 15 months of salary, 15 months annual target bonus and 15 months COBRA premiums.

The Compensation Committee believes these severance and change in control benefits, which are subject to execution of general releases of claims against the Company, are essential elements of our executive compensation program and assist us in recruiting, retaining and developing key management talent in the competitive San Francisco Bay Area employment market. Our change in control benefits are intended to allow employees, including our NEOs, to focus their attention on the business operations of CytomX in the face of the potentially disruptive impact of a rumored or actual change in control transaction, to assess takeover bids objectively without regard to the potential impact on their own job security and to allow for a smooth transition in the event of a change in control of CytomX. In addition, our severance benefits provide reasonable protection to the executive officer in the event that he or she is not retained. We do not provide for any excise tax gross-ups in the amended and restated severance agreements.

In connection with Mr. Ray’s separation of employment from the Company in May 2019, he entered into a consulting arrangement with the Company that expires in December 2020. Under that arrangement he is entitled to receive $250 per hour for time spent on Company matters. Mr. Ray did not receive any severance or other benefits in connection with his termination of employment. In August 2019, it was determined that Dr. Humphrey would leave her employment with the Company. In connection with her separation of employment, the Company and Dr. Humphrey entered into a Separation Agreement on August 28, 2019 which provided that Dr. Humphrey would receive severance benefits consistent with the terms of her Amended and Restated Severance and Change of Control Agreement dated as of March 25, 2019, as described above. She also entered into a consulting arrangement with the Company that terminated in December 2019. Under that consulting arrangement she was entitled to receive $500 per hour for time spent on Company matters.

We offer a comprehensive array of benefits to our employees, including our NEOs. Benefit programs include a variety of health insurance plans, 401(k) plan with Company matching contributions at Board-approved levels, employee stock purchase plan and term life insurance. These benefits are offered to all employees, including executive officers, in order to attract and retain employees. We do not offer defined benefit pension or other supplementary retirement benefits to employees.

The Compensation Committee considers the deductibility of executive compensation under Section 162(m) of the Code in designing, establishing and implementing our executive compensation policies and practices. Section 162(m) generally prohibits us from deducting any compensation over $1 million per taxable year paid to our NEOs unless, under tax laws in effect prior to November 2, 2017, such compensation is treated as “performance-based compensation” within the meaning of Section 162(m) of the Code. The Tax Cuts and Jobs Act (the “Tax Act”) among other changes, repealed the exception from the deduction limit under Section 162(m) for performance-based compensation effective for taxable years beginning after January 1, 2018, such that compensation paid to our covered executive officers in excess of $1 million will not be deductible unless it qualifies for transition relief applicable to

certain arrangements in place as of November 2, 2017 that are not materially modified after that date. However, because of ambiguities and uncertainties as to the application and interpretation of Section 162(m) as revised by the Tax Act, including the uncertain scope of the transition relief adopted in connection with repealing Section 162(m)’s performance-based compensation exception, no assurance can be given that previously granted compensation intended to satisfy the requirements for performance-based compensation will in fact qualify for such exception. In determining the form and amount of compensation for our NEOs, the Compensation Committee will continue to consider all elements of the cost of such compensation, including the potential impact of Section 162(m).

While the Compensation Committee considers the deductibility of awards as one factor in determining executive compensation, the Compensation Committee also looks at other factors in making its decisions and retains the flexibility to award compensation that it determines to be consistent with the goals of our executive compensation program even if the awards are not deductible by us for tax purposes.

In addition to considering the tax consequences, the Compensation Committee considers the accounting consequences of its decisions, including the impact of expenses being recognized in connection with equity-based awards, in determining the size and form of different equity-based awards.

Please see “Board of Directors and Corporate Governance—Information Regarding the Committees of the Board of Directors—Compensation Committee” for information regarding the compensation committee of the Board. In 2019, none of our named executive officers (a) served on the compensation committee of another entity that had an executive officer who served on our compensation committee; (b) served as director of another entity that had an executive officer who served on our compensation committee; or (c) served on compensation committee of another entity that had an executive officer who served as one of our directors.

The following table provides a summary of compensation paid to our named executive officers for the years ended December 31, 2019, 2018 and 2017.

The following table summarizes information about the non-equity incentive awards and equity-based awards granted to our NEOs in 2019:

The following table presents information regarding the outstanding stock options held by each of the named executive officers as of December 31, 2019. None of the named executive officers held any outstanding restricted stock or other equity awards as of that date.

The following table summarizes the stock options exercised and stock awards vested during the year ended December 31, 2019, and the value realized upon exercise or vesting by our NEOs.

We do not have any pension benefits or nonqualified deferred compensation plans.

Our NEOs are entitled to certain severance and change in control benefits under the terms of individual severance and change of control agreements and our equity plans. These severance and change in control provisions are intended to allow employees, including NEOs, to focus their attention on the business operations of CytomX in the face of the potentially disruptive impact of a proposed change in control transaction, to assess takeover bids objectively without regard to the potential impact on their own job security and to allow for a smooth transition in the event of a change in control of CytomX.

The compensation committee believes that the severance benefits we offer remain essential to fulfill the objectives to recruit, retain and develop key management talent in the competitive San Francisco Bay Area employment market. These arrangements enable us to recruit and retain high-quality management talent because they provide reasonable protection to the executive officer in the event that he or she is not retained under limited circumstances.

In February 2019, the Company’s amended Dr. McCarthy’s Amended and Restated Severance and Change of Control Agreement. It provides that if his employment is terminated by us without cause or if Dr. McCarthy terminates his employment due to good reason (as such terms are defined in his agreement), subject to his execution of a general release of claims against the Company, he will be entitled to receive a lump sum payment equal to eighteen months (one-year prior to the amendment) of base salary plus his target annual bonus for such calendar year pro-rated based on his termination date as well as continued medical and dental coverage for a period of either eighteen months (one-year prior to the amendment) following termination of employment or the date Mr. McCarthy becomes eligible for medical and dental coverage from a subsequent employer, whichever occurs earlier. To the extent we are unable to provide such benefit coverage, the Company will make a lump sum payment equal to the premium cost relating to such benefit coverage for the eighteen months (one-year prior to the amendment) prior to Dr. McCarthy’s termination. Dr. McCarthy’s agreement also provides that, in the event of a change of control (as defined in the agreement) and a termination of employment without cause or due to good reason within 60 days prior to or 12 months following such change of control, Dr. McCarthy will be entitled to receive the same benefits, except that the lump sum payment will equal 24 months (18 months prior to the amendment) of his then current base salary plus 24 months (18 months prior to the amendment) of his target annual bonus for such calendar year, and continued medical and dental coverage will be for 24 months (18 months prior to the amendment), unless, within such period, Mr. McCarthy becomes eligible for coverage from his subsequent employer, and full vesting of his outstanding equity awards. In addition, upon a change of control, the performance goal stipulated in any performance-based equity awards held by Dr. McCarthy will be deemed achieved in full.

In March 2019, the Company’s amended each other named executive officer’s Severance and Change of Control Agreement. The agreements entered into with each of our named executive officers other than Dr. McCarthy provide that if the officer’s employment is terminated by us without cause or if the officer terminates his or her employment due to good reason (as such terms are defined in the agreements), subject to his or her execution of a general release of claims against the Company, he or she will be entitled to receive a lump sum payment equal to twelve-months of base salary (nine months prior to the amendment) plus his or her target annual bonus for such calendar year pro-rated based on his or her termination date (not included prior to the amendment) as well as continued medical and dental coverage for a period of either twelve months (nine months prior to the amendment) following termination of employment or the date the named executive officer becomes eligible for medical and dental coverage from their subsequent employer, whichever occurs earlier. To the extent we are unable to provide such benefit coverage, the Company will make a lump sum payment equal to the premium cost relating to such benefit coverage for the twelve months (nine months prior to the amendment) prior to the named executive officers’ termination. The Amended and Restated Severance and Change in Control Agreements entered into with each of our named executive officers other than Dr. McCarthy and Dr. Peterson also provide (including prior to the amendment) that, in the event the officer is terminated without cause or terminates due to good reason, in each case within 60 days prior to or 12 months following a change in control, then the officer will be entitled to receive an amount equal to 12 months of base salary (nine months prior to the amendment) plus 12 months of target annual bonus (nine months prior to the amendment) for such calendar year, and continued medical and dental coverage for 12 months (9 months prior to the amendment), unless, within such period, the officer becomes eligible for coverage from his or her subsequent employer, and each named executive officer will also receive full vesting acceleration of his or her outstanding equity awards.

Dr. Peterson’s amended and restated severance and change of control agreement provided for payouts similar to the other NEOs (other than Dr. McCarthy) in the event of a termination without cause or for good reason, but, for a termination without cause or for good reason within 60 days prior to or 12 months following a change in control, Dr. Peterson would receive 15 months of salary, 15 months of annual target bonus and 15 months COBRA premiums.

In addition, under each of the Severance and Change in Control Agreements for our NEOs, if any payment or other benefit provided to the officer pursuant to the Severance and Change in Control Agreement constitutes a “excess parachute payment” within the meaning of Section 280G of the Code, and would be subject to an excise tax imposed by Section 4999 of the Code, then the amounts actually paid to the officer will be either delivered in full pursuant to the terms of the agreement or reduced to the extent that such a reduction would result in no portion of the payment being subject to the excise tax.

Mr. Ray separated from the Company, effective May 15, 2019. Mr. Ray did not receive any severance or other benefits in connection with this separation, other than a PTO payout of $46,460. Under the terms of his Consulting Agreement with the Company, Mr. Ray received a hourly consulting fee of $250 and his outstanding stock options continued to vest through December 31, 2019, as which time, any unvested stock options were forfeited.

In connection with her separation of employment, the Company and Dr. Humphrey entered into a Separation Agreement on August 28, 2019 which provided that Dr. Humphrey would receive severance benefits consistent with the terms of her Amended and Restated Severance and Change of Control Agreement dated as of March 25, 2019, as described above. Dr. Humphrey received a total of $ $574,024 as her severance payout, of which $458,065 represented 12 months base salary and $115,959 her pro-rated target bonus. Dr. Humphrey did not enroll in our Cobra program and was therefore not eligible for Cobra continuation. She also entered into a consulting arrangement with the Company that terminated in December 2019. Under that consulting arrangement she was entitled to receive $500 per hour for time spent on Company matters.

The following table shows the payments and benefits that would be made to our other NEOs under their agreements as of December 31, 2019 assuming a termination without cause or a resignation for good reason, including within the period commencing 60 days prior to or 12 months following a change in control (CIC), occurring on December 31, 2019.

The following table provides information about the securities authorized for issuance under our equity compensation plans as of December 31, 2019, which consisted of our 2010 Stock Incentive Plan, 2011 Stock Incentive Plan, as amended, 2015 Equity Incentive Plan and 2015 Employee Stock Purchase Plan:

The material in this report is being furnished and shall not be deemed “filed” with the Securities and Exchange Commission (SEC) for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (Exchange Act), or otherwise subject to the liability of that section, nor shall the material in this section be deemed to be “soliciting material” or incorporated by reference in any registration statement or other document filed with the SEC under the Securities Act of 1933, as amended, or the Exchange Act, except as otherwise expressly stated in such filing.

The audit committee is currently comprised of three non-employee directors, Matthew P. Young, who chairs the committee, John Scarlett, M.D. and James R. Meyers. The audit committee has the responsibility and authority described in the audit committee charter, which has been approved by the Board. A copy of the audit committee charter is available on our website at www.cytomx.com .

The audit committee is responsible for assessing the information provided by management and our independent registered public accounting firm in accordance with its business judgment. Management is responsible for the preparation, presentation and integrity of our financial statements and for the appropriateness of the accounting principles and reporting policies that are used. Management is also responsible for testing the system of internal controls and reports to the audit committee on any deficiencies found. Our independent registered public accounting firm, Ernst & Young LLP, is responsible for auditing the annual financial statements and for reviewing the unaudited interim financial statements.

In fulfilling its oversight responsibilities, the audit committee has reviewed and discussed the audited financial statements in our Annual Report on Form 10-K for the year ended December 31, 2019 with both management and our independent registered public accounting firm. The audit committee’s review included a discussion of the quality and integrity of the accounting principles, the reasonableness of significant estimates and judgments and the clarity of disclosures in the financial statements.

The audit committee reviewed with our independent registered public accounting firm the overall scope and plan of the audit. In addition, it met with our independent registered public accounting firm, with and without management present, to discuss the results of our registered public accounting firm’s examination, the evaluation of our system of internal controls, the overall quality of our financial reporting and such other matters as are required to be discussed under generally accepted accounting standards in the United States. The audit committee has also received from, and discussed with, our independent registered public accounting firm the matters required to be discussed by Auditing Standard No. 16, “Communications with Audit Committees” issued by the Public Company Accounting Oversight Board (PCAOB).

The audit committee has discussed with Ernst & Young LLP that firm’s independence from management and our company, including the matters in the written disclosures and the letter regarding independence from Ernst & Young LLP required by applicable requirements of the PCAOB. The audit committee has also considered the compatibility of audit related and tax services with the auditors’ independence. Based on its evaluation, the audit committee has selected Ernst & Young LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2020.

In reliance on the reviews and discussions referred to above, the audit committee recommended to the Board, and the Board approved, the inclusion of the audited financial statements and management’s assessment of the effectiveness of our internal controls over financial reporting in the Annual Report on Form 10-K for the year ended December 31, 2019 filed with the SEC.

The Board knows of no other matters that will be presented for consideration at the annual meeting. If any other matters are properly brought before the meeting, it is the intention of the persons named in the accompanying proxy to vote on such matters in accordance with their best judgment.

Our website address is http://www.cytomx.com . The information in, or that can be accessed through, our website is not deemed to be incorporated by reference into this proxy statement.

Our annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K and amendments to those reports are available, free of charge, on or through our website as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. The SEC maintains an internet site that contains reports, proxy and information statements and other information regarding our filings at www.sec.gov . In addition, a copy of our Annual Report on Form 10-K for the fiscal year ended December 31, 2019 filed with the SEC is available without charge upon written request to: Secretary, CytomX Therapeutics, Inc., at 151 Oyster Point Boulevard, Suite 400, South San Francisco, CA 94080.