EX-10.2



 Exhibit 10.2 

CYTOMX THERAPEUTICS, INC. 

2011 STOCK INCENTIVE PLAN 

RESTRICTED STOCK AWARD AGREEMENT 

THIS RESTRICTED STOCK AWARD AGREEMENT (this “Agreement”) is dated as of the      day of
                    , by and between CytomX Therapeutics, Inc., a Delaware corporation (the “Corporation”), and
                         (the “Participant”). 

W I T N E S S E T H 

WHEREAS, pursuant to the CytomX Therapeutics, Inc. 2011 Stock Incentive Plan (the “Plan”), the Corporation hereby
grants to the Participant, effective as of the date first set forth above (the “Award Date”), a restricted stock award (the “Award”), upon the terms and conditions set forth herein and in the Plan; and 

WHEREAS, the Participant desires to purchase the shares of restricted stock subject to the Award on and subject to the terms and
conditions set forth herein and in the Plan. 
 NOW THEREFORE, in consideration of the mutual promises made herein and the mutual
benefits to be derived therefrom, the parties agree as follows: 
 1. Defined Terms. Capitalized terms used in this Agreement
and not otherwise defined herein shall have the meanings given to such terms in the Plan. 
 2. Grant. Subject to the
terms of this Agreement, the Corporation hereby grants to the Participant an Award with respect to an aggregate of [            ] restricted shares of Common Stock of the Corporation
(subject to adjustment as provided in Section 7.3.1 of the Plan) (the “Restricted Shares”) [at a purchase price of [$            ] per share (the
“Purchase Price”). The Participant agrees to promptly pay to the Corporation, in accordance with Section 6.3.2 of the Plan, the amount of the aggregate Purchase Price for the Restricted Shares]. [Include bracketed
language if the participant will be required to pay for the shares. If there is no purchase price, the Board resolutions approving the grant should address minimal consideration for par value in light of applicable requirements under
the law of the state of incorporation.] 
 3. Vesting. [The Award shall vest, and restrictions imposed on the
Restricted Shares pursuant to Section 6(a) below shall lapse, with respect to 25% of the total number of Restricted Shares (subject to adjustment under Section 7.3.1 of the Plan) on each of the first, second, third and fourth anniversaries
of the Award Date; provided that the Participant is employed by or providing services to the Corporation or one of its Affiliates on such date and has otherwise not previously incurred a Severance Date (as determined under the Plan).] [Confirm
vesting schedule] 
 4. Continuance of Employment/Service Required; No Employment/Service Commitment. The vesting
schedule in Section 3 requires continued employment or service through each applicable vesting date as a condition to the vesting of the applicable installment of the Award and the rights and benefits under this Agreement. Employment or service
for only a portion of the vesting period, even if a substantial portion, will not entitle the Participant to any proportionate vesting or avoid or mitigate a termination of rights and benefits upon or following a termination of employment or service
as provided in Section 6 below or under the Plan. 

  
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 Nothing contained in this Agreement or the Plan constitutes an employment or service commitment
by the Corporation or any of its Affiliates, affects the Participant’s status, if he or she is an employee, as an employee at will who is subject to termination without cause, confers upon the Participant any right to remain employed by or in
service to the Corporation or any Affiliate, interferes in any way with the right of the Corporation or any Affiliate at any time to terminate such employment or service, or affects the right of the Corporation or any Affiliate to increase or
decrease the Participant’s other compensation or benefits. 
 5. Dividend and Voting Rights. After the Award Date, the
Participant shall be entitled to cash dividends and voting rights with respect to the Restricted Shares subject to the Award even though such shares are not vested, provided that such rights shall terminate immediately as to any Restricted Shares
that are forfeited pursuant to Section 6(a) or that are repurchased pursuant to Section 9 of this Agreement. 
 6.
Restrictions on Transfer. 
 (a) Restrictions Prior to Vesting; Effect of Termination of Employment Prior to
Vesting. Prior to the time that they have become vested pursuant to Section 3, the Restricted Shares, any interest therein, amount payable in respect thereof, and the Restricted Property (as defined in Section 11) may not be sold or
transferred, except as provided in Section 7.2 of the Plan. If the Participant ceases to be employed by or ceases to provide services to the Corporation or an Affiliate, the Participant’s Restricted Shares (and related Restricted Property)
shall be forfeited to the Corporation to the extent such shares have not become vested pursuant to Section 3 hereof as of the Participant’s Severance Date (regardless of the reason for such termination of employment or service, whether
with or without cause, voluntarily or involuntarily, or due to death or disability). Upon the occurrence of any forfeiture of Restricted Shares hereunder, such unvested, forfeited shares and related Restricted Property shall be automatically
transferred to the Corporation as of the Severance Date, without any other action by the Participant (or the Participant’s Beneficiary or Personal Representative in the event of the Participant’s death or disability, as applicable). The
Corporation may exercise its powers under Section 7(d) hereof and take any other action necessary or advisable to evidence such transfer. The Participant (or the Participant’s Beneficiary or Personal Representative in the event of the
Participant’s death or disability, as applicable) shall deliver any additional documents of transfer that the Corporation may request to confirm the transfer of such unvested, forfeited shares and related Restricted Property to the Corporation.
[No consideration shall be paid by the Corporation with respect to such transfer.] [or, if the participant was required to pay for the shares, use the following provisions:] [Within a reasonable period of time following the
Corporation’s receipt of such unvested, forfeited shares, any related Restricted Property and any other documents required pursuant to the preceding sentence, the Corporation shall pay to the Participant (in the form of a check or by
cancellation of money purchase indebtedness) an amount equal to the lesser of (i) the original Purchase Price paid by the Participant for the unvested, forfeited shares, or (ii) the Fair Market Value of the unvested, forfeited
shares determined as of the Severance Date. No interest shall be paid with respect to and no other adjustments (other than adjustments in accordance with Section 7.3.1 of the Plan to reflect stock splits and similar changes in capitalization)
shall be made to the repurchase amount determined pursuant to the preceding sentence.] 

  
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 (b) Restrictions After Vesting. Upon and after the time that they have become vested
pursuant to Section 3, the Restricted Shares shall not continue to be subject to the restrictions set forth in Section 6(a), but such shares shall continue to be subject to the other limitations and restrictions set forth herein and in the
Plan (including, without limitation, the provisions of Section 7.5 of the Plan and Sections 8 and 9 of this Agreement). 
 (c) Other
Transfers Void. Any sale or transfer, or purported sale or transfer, of any Restricted Shares acquired pursuant to this Agreement or any interest therein other than to the Corporation shall be null and void unless the terms, conditions and
provisions of this Agreement and the Plan are strictly observed and followed. Furthermore, the proposed transferee in any otherwise permitted transfer of the Restricted Shares acquired pursuant to this Agreement shall, as a condition precedent to
any such transfer, agree in writing with the Corporation to be bound by the restrictions on such shares set forth in this Agreement and in the Plan (including, without limitation, the provisions of Sections 8 and 9 which shall continue in effect
with respect to the shares). Furthermore, no Restricted Shares acquired pursuant to this Agreement shall be transferred after the Corporation has given notice that it (or another permitted purchaser) will purchase such shares pursuant to
Section 9 as long as the Corporation is not in default of its obligation to pay for the shares subject to the repurchase. 
 (d)
Charter Documents. The Certificate of Incorporation and Bylaws of the Corporation, as either of them may be amended from time to time, may provide for additional restrictions and limitations with respect to the Common Stock (including
additional restrictions and limitations on the transfer of shares). To the extent that these restrictions and limitations are greater than those set forth in this Agreement, such restrictions and limitations shall apply to the Restricted Shares
(both before and after such shares shall have become vested) and are incorporated herein by this reference. Such restrictions and limitations are not, however, in lieu of, nor shall they in any way reduce or eliminate, any limitation or restriction
on the Restricted Shares imposed under the Plan or this Agreement. 
 7. Delivery of Shares. 

(a) Form. The Corporation shall, in its discretion, issue the Restricted Shares either: (1) in certificate form as provided in
clause (b) below; or (2) if the Common Stock is then publicly-traded, in book entry form, registered in the name of the Participant with notations regarding the applicable restrictions on transfer imposed under this Agreement. 

(b) Certificates to be Held by Corporation; Legend. Any certificates representing the Restricted Shares that may be delivered to the
Participant by the Corporation prior to vesting of the Restricted Shares pursuant to Section 3 shall be redelivered to the Corporation to be held by the Corporation or its designee until the shares represented thereby vest pursuant to
Section 3 or are repurchased pursuant to this Agreement. Any such certificates will bear a legend making appropriate reference to the restrictions imposed hereunder. 

  
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 (c) Delivery of Certificates Upon Vesting. Promptly after the vesting of any Restricted
Shares pursuant to Section 3, the Corporation shall, as applicable, either remove the notations on any such vested Restricted Shares issued in book entry form or deliver to the Participant a certificate or certificates evidencing the number of
such vested Restricted Shares (or, in either case, such lesser number of shares as may be permitted pursuant to the tax withholding provisions referred to in Section 12). The Participant (or the beneficiary or personal representative of the
Participant in the event of the Participant’s death or incapacity, as the case may be) shall deliver to the Corporation any representations or other documents or assurances as the Corporation may deem necessary or reasonably desirable to ensure
compliance with all applicable legal and regulatory requirements. The shares so delivered shall no longer be restricted pursuant to Section 6(a) but shall continue to be subject to the restrictions referred to in Section 6(b). 

(d) Stock Power; Power of Attorney. Concurrent with the execution and delivery of this Agreement, the Participant shall deliver to the
Corporation an executed stock power in the form attached hereto as Exhibit A, in blank, with respect to the Restricted Shares and any related Restricted Property. The Participant, by acceptance of the Award, shall be deemed to appoint, and does so
appoint by execution of this Agreement, the Corporation and each of its authorized representatives as the Participant’s attorney(s)-in-fact to (1) effect any transfer to the Corporation (or other purchaser, as the case may be) of the
Restricted Shares acquired pursuant to this Agreement (including any related Restricted Property) that are repurchased by the Corporation (or other permitted purchaser), and (2) execute such documents as the Corporation or such representatives
deem necessary or advisable in connection with any such transfer. 
 (e) Share Legend Generally. The certificate(s) representing the
Restricted Shares (both before and after such shares shall have become vested pursuant to Section 3) shall bear the legend set forth in Section 7.5.3 of the Plan and/or any other appropriate or required legends under applicable
laws. Such legends shall remain on the certificate(s) representing the Restricted Shares until the later of (1) the Public Offering Date (or such later date that counsel to the Corporation may reasonably determine is advisable to help ensure
the Corporation’s compliance with all applicable legal and regulatory requirements) or (2) the date that such shares become vested pursuant to Section 3. For purposes of this Agreement, the term “Public Offering
Date” means the first day that the Common Stock is registered under the Exchange Act and listed or quoted on a recognized national securities exchange. 

8. Lock-Up Agreement. Neither the Participant (nor any permitted transferee) may, directly or indirectly, offer, sell or
transfer or dispose of any of the Restricted Shares after such shares have vested pursuant to Section 3 (the “Shares”) or any interest therein (or agree to do any thereof) (collectively, a
“Transfer”) during the period commencing as of 14 days prior to and ending 180 days, or such lesser period of time as the relevant underwriters may permit (or such other period as may be requested by the
Corporation or an underwriter to accommodate regulatory restrictions on (a) the publication or other distribution of research reports and (b) analyst recommendations and opinions, including, but not limited to, the restrictions contained
in FINRA Rule 2711(f)(4) or NYSE Rule 472(f)(4), or any successor provisions or amendments thereto), after the effective date of a registration statement covering any public offering of the Corporation’s securities of which the Participant has
notice. (The term “Participant” for purposes of this Agreement includes, where the context so requires, any permitted direct or 

  
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indirect transferee of the Participant.) The Participant shall agree and consent to the entry of stop transfer instructions with the Corporation’s transfer agent against the Transfer of the
Corporation’s securities beneficially owned by the Participant and shall confirm the limitations hereunder by agreement with and for the benefit of the relevant underwriters by a lock-up agreement or other agreement in customary form.
Notwithstanding anything else herein to the contrary, this Section 8 shall not be construed so as to prohibit the Participant from participating in a registration or a public offering of the Common Stock with respect to any Shares which he or
she may hold at that time, provided, however, that such participation shall be at the sole discretion of the Board. 
 9. Right of
First Refusal. 
 (a) General. The Corporation shall have a right of first refusal, as set forth in this Section 9, to
purchase the Shares before such shares (or any interest in them) can be validly transferred to any other person or entity. 
 (b) Notice
of Intent to Sell. Before there can be a valid sale or transfer of any of the Shares (or any interest in them) by any holder thereof, the holder shall first give notice in writing to the Corporation, mailed or delivered in accordance with the
provisions of Section 13, of his or her intention to sell or transfer such shares (the “Option Notice”). The Option Notice shall specify the identity of the proposed transferee, the number of Shares to be
sold or transferred to the transferee, the price per Share and the terms upon which such holder intends to make such sale or transfer. If the payment terms for the Shares described in the Option Notice differ from delivery of cash or a check at
closing, the Corporation shall have the option, as set forth herein, of purchasing the Shares for cash (or a cash equivalent) at closing in an amount which the Corporation determines is a fair value equivalent of that payment. The determination of a
fair value equivalent shall be made in the Corporation’s best judgment and such determination shall be mailed or delivered to the selling or transferring stockholder (the “Corporation’s Notice”) within ten
(10) days of its receipt of the Option Notice. Should the selling or transferring stockholder disagree with the Corporation’s determination of a fair value equivalent, he or she shall have the right (the “Retraction
Right”) to retract the proposed sale or transfer to a third party and the offer of Shares to the Corporation pursuant to the Option Notice (such retraction to be made in writing and mailed or delivered in accordance with the
provisions of Section 13). If the stockholder again proposes to sell or transfer the Shares, the stockholder shall again offer such shares to the Corporation pursuant to the terms of this Section 9 prior to any sale or transfer. 

(c) Option to Purchase. Subject to the selling stockholder’s Retraction Right, during the 60-day period commencing upon
receipt of the Option Notice by the Corporation (the “Option Period”), the Corporation shall have an option to purchase any or all of the Shares specified in the Option Notice at the price offered therein (the
“Right of First Refusal”). 
 (d) Purchase of Shares. Not more than thirty (30) days after receipt
of the Option Notice, the Corporation shall give written notice to the stockholder desiring to sell or transfer Shares of the number of such Shares to be purchased (or, if no Shares are to be purchased, stating such fact) by the Corporation pursuant
to the terms of this Section 9 (the “Purchase Notice”). Purchases pursuant to this Section 9 shall be consummated within thirty (30) days after delivery of the Purchase Notice to the selling
stockholder, but in no event later than the expiration of the 

  
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Option Period. The purchase price shall be paid at the closing in cash, by check, by cancellation of money purchase indebtedness, or, if the payment terms set forth in the Option Notice differ
from payment in cash or by check at closing, in accordance with the payment terms set forth in the Option Notice (or payment of the amount set forth in the Corporation’s Notice in cash, by cancellation of money purchase indebtedness, or by
check). The purchase price shall be paid against surrender by the selling stockholder of a stock certificate evidencing the number of Shares specified in the Option Notice, with duly endorsed stock powers. 

(e) Ability to Sell Unpurchased Shares. Unless all of the Shares referred to in the Option Notice are to be purchased as indicated in
the Purchase Notice, the stockholder desiring to sell or transfer may dispose of any shares referred to in the Option Notice that are not to be purchased by the Corporation to the person or persons specified in the Option Notice during a period of
twenty (20) days commencing upon his or her receipt of the Purchase Notice; provided, however, that he or she shall not sell or transfer such Shares (1) at a lower price or on terms more favorable to the purchaser or transferee than those
specified in the Option Notice, or (2) to a person other than the person or persons specified in the Option Notice; and provided further that such transfer is consistent with the other provisions and limitations of the Plan and this Agreement.
If the transfer is not consummated within such twenty (20) day period, the stockholder shall again offer such Shares to the Corporation pursuant to the terms of this Section 9 prior to any sale or transfer to the same or any other person.

 (f) Assignment. Notwithstanding anything to the contrary, the Corporation may assign any or all of its rights under this
Section 9 to one or more stockholders of the Corporation. 
 (g) Termination of Right of First Refusal. The Corporation’s
Right of First Refusal shall terminate to the extent that it is not exercised prior to the Public Offering Date. 
 10. Other
Repurchase Provisions. 
 (a) Return of Shares. The Corporation may exercise its powers under Section 7(d) hereof and
take any other action necessary or advisable to evidence any transfer of shares to or other repurchase of shares by the Corporation (or other purchaser) pursuant to this Agreement. The Participant (or the Participant’s Beneficiary or Personal
Representative, as the case may be) shall deliver any additional documents of transfer that the Corporation may request to confirm the transfer or repurchase, as the case may be, of such shares. 

(b) No Stockholder Rights Following Exercise of Repurchase Right. If the Participant (or any permitted transferee) holds shares as to
which the Right of First Refusal has been exercised (in connection with the termination of the Participant’s employment or otherwise), or holds shares that have been forfeited pursuant to this Agreement, the Participant shall be entitled to the
payment in accordance with the applicable provisions of this Agreement, but (unless otherwise required by law) shall no longer be entitled to participation in the Corporation or other rights as a stockholder with respect to the shares subject to the
repurchase. To the maximum extent permitted by law, the Participant’s rights following any such repurchase shall, with respect to the repurchase and the Shares covered thereby, be solely the rights that he or she has as a general creditor of
the Corporation to receive payment of the amount specified in the applicable provisions of this Agreement. 

  
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 11. Adjustments upon Specified Events. Upon the occurrence of certain events
relating to the Corporation’s stock contemplated by Section 7.3.1 of the Plan, the Administrator shall make adjustments in accordance with such section in the number and kind of securities that may become vested under the Award. If any
adjustment is made to the Restricted Shares pursuant to Section 7.3.1 of the Plan, the restrictions applicable to the Restricted Shares will continue in effect with respect to any consideration or other securities (the
“Restricted Property”  and, for the purposes of this Agreement, “Restricted Shares” shall include “Restricted Property,” unless the context otherwise requires) received in respect of such
Restricted Shares. Such Restricted Property shall vest at such times and in such proportion as the Restricted Shares to which the Restricted Property is attributable vest, or would have vested pursuant to the terms hereof if such Restricted Shares
had remained outstanding. To the extent that the Restricted Property includes any cash (other than regular cash dividends provided for in Section 5 hereof), such cash shall be invested, pursuant to policies established by the Administrator, in
interest bearing, FDIC-insured (subject to applicable insurance limits) deposits of a depository institution selected by the Administrator, the earnings on which shall be added to and become a part of the Restricted Property. 

12. Tax Withholding. The Corporation shall reasonably determine the amount of any federal, state, local or other income,
employment, or other taxes which the Corporation or any of its subsidiaries may reasonably be obligated to withhold with respect to the grant, vesting, making of an election under Section 83(b) of the Code or other event with respect to the
Restricted Shares. The Corporation’s obligation to deliver the Restricted Shares or any certificates evidencing the Restricted Shares, or otherwise remove the restrictive notations or legends on such shares or certificates that refer to the
transfer restrictions set forth in Section 6(a), is subject to the condition precedent that the Participant either pay or provide for the amount of any such withholding obligations in such manner as may be authorized by the Administrator under,
or as may otherwise be permitted under, Section 7.6 of the Plan. 
 13. Notices. Any notice to be given under the
terms of this Agreement shall be in writing and addressed to the Corporation at its principal office to the attention of the Secretary, and to the Participant at the address reflected or last reflected on the Corporation’s payroll records. Any
notice shall be delivered in person or shall be enclosed in a properly sealed envelope, addressed as aforesaid, registered or certified, and deposited (postage and registry or certification fee prepaid) in a post office or branch post office
regularly maintained by the United States Government. Any such notice shall be given only when received, but if the Participant is no longer an Eligible Person, shall be deemed to have been duly given five business days after the date mailed in
accordance with the foregoing provisions of this Section 13. 
 14. Plan. The Award and all rights of the
Participant under this Agreement are subject to the terms and conditions of the Plan, incorporated herein by this reference. The Participant agrees to be bound by the terms of the Plan and this Agreement. The Participant acknowledges having read and
understood the Plan, the Stock Award Questions & Answers for the Plan, and this Agreement. Unless otherwise expressly provided in other sections of this Agreement, provisions of the Plan that confer discretionary authority on the Board or
the Administrator do not and shall not be deemed to create any rights in the Participant unless such rights are expressly set forth herein or are otherwise in the sole discretion of the Board or the Administrator so conferred by appropriate action
of the Board or the Administrator under the Plan after the date hereof. 

  
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 15. Entire Agreement. This Agreement (including the exhibit hereto) and the
Plan together constitute the entire agreement and supersede all prior understandings and agreements, written or oral, of the parties hereto with respect to the subject matter hereof. The Plan and this Agreement may be amended pursuant to
Section 7. 7 of the Plan. Any such amendment must be in writing and signed by the Corporation. The Corporation may, however, unilaterally waive any provision hereof in writing to the extent such waiver does not materially and adversely affect
the Participant’s rights with respect to the Award, provided that no such waiver shall operate or be construed to be a subsequent waiver of the same provision or a waiver of any other provision hereof. 

16. Effect of this Agreement. This Agreement shall be assumed by, be binding upon and inure to the benefit of any
successor or successors to the Corporation. 
 17. Governing Law; Arbitration; Severability; Miscellaneous. 

(a) Delaware Law. This Agreement shall be governed by and construed and enforced in accordance with the laws of the State of Delaware
without regard to conflict of law principles thereunder. 
 (b) Construction. The terms of the Award grant have resulted from the
negotiations of the parties and each of the parties has had an opportunity to obtain and consult with its own counsel. The language of all parts of the Plan and this Agreement shall in all cases be construed as a whole, according to its fair
meaning, and not strictly for or against either of the parties. 
 (c) Limited Rights. The Participant shall have no rights as a
stockholder of the Corporation with respect to the Restricted Shares until the Participant has purchased such shares and the shares have been issued by the Corporation in the name of the Participant. The Participant’s rights with respect to the
Restricted Shares after the date of such issuance are subject to the terms and conditions set forth herein. 
 (d) Arbitration. Any
controversy arising out of or relating to this Agreement, its enforcement or interpretation, or because of an alleged breach, default, or misrepresentation in connection with any of its provisions, or any other controversy arising out of or related
to the Award, including, but not limited to, any state or federal statutory claims, shall be submitted to arbitration in San Francisco County, California, before a sole arbitrator selected from Judicial Arbitration and Mediation Services, Inc., San
Francisco, California, or its successor (“JAMS”), or if JAMS is no longer able to supply the arbitrator, such arbitrator shall be selected from the American Arbitration Association, and shall be conducted in accordance with the
provisions of California Code of Civil Procedure §§ 1280 et seq. as the exclusive forum for the resolution of such dispute; provided, however, that provisional injunctive relief may, but need not, be sought by either party to this
Agreement in a court of law while arbitration proceedings are pending, and any provisional injunctive relief granted by such court shall remain effective until the matter is finally determined by the arbitrator. Final resolution of any dispute
through arbitration may include any remedy or relief which the arbitrator deems just and equitable, including any and all 

  
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remedies provided by applicable state or federal statutes. At the conclusion of the arbitration, the arbitrator shall issue a written decision that sets forth the essential findings and
conclusions upon which the arbitrator’s award or decision is based. Any award or relief granted by the arbitrator hereunder shall be final and binding on the parties hereto and may be enforced by any court of competent jurisdiction. The parties
acknowledge and agree that they are hereby waiving any rights to trial by jury in any action, proceeding or counterclaim brought by either of the parties against the other in connection with any matter whatsoever arising out of or in any way
connected with any of the matters referenced in the first sentence above. The parties agree that Corporation shall be responsible for payment of the forum costs of any arbitration hereunder, including the arbitrator’s fee. The parties further
agree that in any proceeding with respect to such matters, each party shall bear its own attorney’s fees and costs (other than forum costs associated with the arbitration) incurred by it or him or her in connection with the resolution of the
dispute. 
 (e) Severability. If the arbitrator selected in accordance with Section 17(d) or a court of competent jurisdiction
determines that any portion of this Agreement or the Plan is in violation of any statute or public policy, then only the portions of this Agreement or the Plan, as applicable, which violate such statute or public policy shall be stricken, and all
portions of this Agreement and the Plan which do not violate any statute or public policy shall continue in full force and effect. Furthermore, it is the parties’ intent that any court order striking any portion of this Agreement and/or the
Plan should modify the stricken terms as narrowly as possible to give as much effect as possible to the intentions of the parties hereunder. 

(f) Counterparts. This Agreement may be executed simultaneously in any number of counterparts, each of which shall be deemed an original
but all of which together shall constitute one and the same instrument. 
 (g) Section Headings. The section headings of this
Agreement are for convenience of reference only and shall not be deemed to alter or affect any provision hereof. 
 (h) Further
Assurances. Each of the parties hereto shall use its reasonable and diligent best efforts to proceed promptly with the transactions contemplated herein, to fulfill the conditions precedent for such party’s benefit or to cause the same to be
fulfilled and to execute such further documents and other papers and perform such further acts as may be reasonably required or desirable to carry out the provisions hereof and the transactions contemplated herein. 

18. Securities Law Representations. The Participant acknowledges that the Restricted Shares are not being registered under
the Securities Act, based, in part, in reliance upon an exemption from registration under Securities and Exchange Commission Rule 701 promulgated under the Securities Act, and a comparable exemption from qualification under applicable state
securities laws, as each may be amended from time to time. The Participant, by executing this Agreement, hereby makes the following representations to the Corporation and acknowledges that the Corporation’s reliance on federal and state
securities law exemptions from registration and qualification is predicated, in substantial part, upon the accuracy of these representations: 

  
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	 	•	 	The Participant is acquiring the Restricted Shares solely for the Participant’s own account, for investment purposes only, and not with a view to or an intent to sell, or to offer for resale in connection with any
unregistered distribution, all or any portion of the shares within the meaning of the Securities Act and/or any applicable state securities laws. 

  

	 	•	 	The Participant has had an opportunity to ask questions and receive answers from the Corporation regarding the terms and conditions of the Award and the restrictions imposed on the Restricted Shares. The Participant has
been furnished with, and/or has access to, such information as he or she considers necessary or appropriate for deciding whether to purchase the Restricted Shares. However, in evaluating the merits and risks of an investment in the Restricted
Shares, the Participant has and will rely upon the advice of his/her own legal counsel, tax advisors, and/or investment advisors. 

  

	 	•	 	The Participant is aware that the Restricted Shares may be of no practical value and that any investment in common shares of a closely held corporation such as the Corporation is non-marketable, non-transferable and
could require capital to be invested for an indefinite period of time, possibly without return, and at substantial risk of loss. 

  

	 	•	 	The Participant understands that the Restricted Shares will be characterized as “restricted securities” under the federal securities laws, and that, under such laws and applicable regulations, such securities
may be resold without registration under the Securities Act only in certain limited circumstances, including in accordance with the conditions of Rule 144 promulgated under the Securities Act, as presently in effect. The Participant acknowledges
receiving a copy of Rule 144 promulgated under the Securities Act, as presently in effect, and represents that he is familiar with such rule, and understands the resale limitations imposed thereby and by the Securities Act and the applicable state
securities law. 

  

	 	•	 	The Participant has read and understands the restrictions and limitations set forth in the Plan and this Agreement which will be imposed on the Restricted Shares (including those restrictions and limitations which will
continue after the shares have vested), including, but not limited to, the provisions of Section 6, 8 and 9 of this Agreement. 

  

	 	•	 	At no time was an oral representation made to the Participant relating to the Award or the purchase of Restricted Shares and the Participant was not presented with or solicited by any promotional meeting or material
relating to the Award or the Restricted Shares. 

  

	 	•	 	The Participant understands and acknowledges that (a) any certificate evidencing the Restricted Shares (or evidencing any other securities issued with respect thereto pursuant to any stock split, stock dividend,
merger or other form of reorganization or recapitalization) when issued shall bear, in addition to any other legends which may be required by applicable state securities laws, the legend set forth in Section 7.5.3 of the Plan, and (b) the
Corporation has no obligation to register the Restricted Shares or file any registration statement under federal or state securities laws. 


  
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 19. Satisfaction of All Rights to Equity. The Award is in complete
satisfaction of any and all rights that the Participant may have (under an employment, consulting, or other written or oral agreement with the Corporation or any of its Affiliates, or otherwise) to receive (1) stock options or stock awards with
respect to the securities of the Corporation or any of its Affiliates, and/or (2) any other equity or derivative security in or with respect to the Corporation or any of its Affiliates. This Agreement supersedes the terms of all prior
understandings and agreements, written or oral, of the parties with respect to such matters. The Participant shall have no further rights or benefits under any prior agreement conveying any right with respect to any security or derivative security
in or with respect to the Corporation or any of its Affiliates. The foregoing notwithstanding, this Section 19 shall not adversely affect the Participant’s rights under any prior stock option or stock award agreement under the Plan
(provided such agreement is expressly labeled as a stock option or stock award agreement under the Plan and is similar in form to this Agreement) which has been signed by an authorized officer of the Corporation. 

20. Clawback Policy. The Restricted Shares are subject to the terms of the Corporation’s recoupment, clawback or
similar policy as it may be in effect from time to time, as well as any similar provisions of applicable law, any of which could in certain circumstances require repayment or forfeiture of the Restricted Shares or other cash or property received
with respect to the Restricted Shares (including any value received from a disposition of the Restricted Shares). 
 21. No Advice
Regarding Grant. The Participant is hereby advised to consult with his or her own tax, legal and/or investment advisors with respect to any advice the Participant may determine is needed or appropriate with respect to the Restricted
Shares (including, without limitation, to determine the foreign, state, local, estate and/or gift tax consequences with respect to the Award, the advantages and disadvantages of making an election under Section 83(b) of the Code with respect to
the Award, and the process and requirements for such an election). Neither the Corporation nor any of its officers, directors, affiliates or advisors makes any representation (except for the terms and conditions expressly set forth in this
Agreement) or recommendation with respect to the Award or the making an election under Section 83(b) of the Code with respect to the Award. In the event the Participant desires to make an election under Section 83(b) of the Code with
respect to the Award, it is the Participant’s sole responsibility to do so timely. Except for the withholding rights set forth in Section 12 above, the Participant is solely responsible for any and all tax liability that may arise with
respect to the Award. 
 [The remainder of this page has intentionally been left blank.] 

  
 11 








 IN WITNESS WHEREOF, the Corporation has caused this Agreement to be executed on its behalf
by a duly authorized officer and the Participant has hereunto set his or her hand as of the date and year first above written. 
  

	
	CytomX Therapeutics, Inc.,
	a Delaware corporation
	
	By:                                     
                                         
                  
	
	Print
Name:                                        
                                        

	
	Its:                                     
                                         
                   
	
	“PARTICIPANT”
	
	  

	Signature
	
	  

	Print Name
	
	  

	Address
	
	  

	City, State, Zip Code



  
 12 








 CONSENT OF SPOUSE 

In consideration of the execution of the foregoing Restricted Stock Award Agreement by CytomX Therapeutics, Inc., I,
                                         
       , the spouse of the Participant therein named, do hereby join with my spouse in executing the foregoing Restricted Stock Award Agreement and do hereby agree to be bound by all of the terms and provisions
thereof and of the Plan. 
 Dated:
                    ,          

 

	
	  

	Signature of Spouse
	
	  

	Print Name



  
 13 








 EXHIBIT A 

STOCK POWER 
 FOR
VALUE RECEIVED and pursuant to that certain Restricted Stock Award Agreement between CytomX Therapeutics, Inc., a Delaware corporation (the “Corporation”), and the individual named below (the “Individual”) dated as
of                     , the Individual, hereby sells, assigns and transfers to the Corporation, an aggregate
             shares of Common Stock of the Corporation, standing in the Individual’s name on the books of the Corporation and represented by stock certificate number(s)
                                        
to which this instrument is attached, and hereby irrevocably constitutes and appoints                     

                          
                                   as his or her attorney in fact and agent
to transfer such shares on the books of the Corporation, with full power of substitution in the premises. 
 Dated
                    ,          

 

	
	  

	Signature
	
	  

	Print Name


 (Instruction: Please do not fill in any blanks other than the signature line. The purpose of the assignment is to
enable the Corporation to exercise its sale/purchase option set forth in the Restricted Stock Award Agreement without requiring additional signatures on the part of the Individual.) 

  
 1 








 Grant #«Grant» 

CYTOMX THERAPEUTICS, INC. 

2011 STOCK INCENTIVE PLAN 

STOCK OPTION AGREEMENT 

THIS STOCK OPTION AGREEMENT (this “Option Agreement”) dated
                                 by and between CytomX Therapeutics, Inc., a Delaware
corporation (the “Corporation”), and «Name» (the “Participant”) evidences the stock option (the “Option”) granted by the Corporation to the Participant as to the number of shares
of the Corporation’s Common Stock, par value $0.00001 per share, first set forth below. 
  

					
	Number of Shares of Common Stock:1		«Shares»		Award Date: «Award_Date»
			
	Exercise Price per Share:1		«Price»		Expiration Date:1,2 «Exp_Date»
			
	Vesting Commencement Date:		«VCD»		
			
	Type of Option (check one):		Nonqualified Stock Option		«NQSO»
			
			Incentive Stock Option      		«ISO»

 Vesting1,2 [The Option shall become vested as to 25%
of the total number of shares of Common Stock subject to the Option on the first anniversary of the Vesting Commencement Date. The remaining 75% of the total number of shares of Common Stock subject to the Option shall vest in 36 substantially equal
monthly installments, with the first installment vesting on the last day of the month following the month in which the first anniversary of the Vesting Commencement Date occurs and an additional installment vesting on the last day of each of the 35
months thereafter.] 
 The Option is granted under the CytomX Therapeutics, Inc. 2011 Stock Incentive Plan (the
“Plan”) and subject to the Terms and Conditions of Stock Option (the “Terms”) attached to this Option Agreement (incorporated herein by this reference) and to the Plan. The Option has been granted to the Participant
in addition to, and not in lieu of, any other form of compensation otherwise payable or to be paid to the Participant. Capitalized terms are defined in the Plan if not defined herein. The parties agree to the terms of the Option set forth herein.
The Participant acknowledges receipt of a copy of the Terms, the Plan and the Stock Option Questions & Answers for the Plan, specifically acknowledges and agrees to Section 12 of the Terms, and agrees to maintain in confidence all
information provided to him/her in connection with the Option. 
  

					
	“PARTICIPANT”				 CYTOMX THERAPEUTICS, INC.,
 a Delaware
corporation

	  
				
	Signature				
			
	 «Name»
				By:                                     
                                         
                         
	Print Name				  

Its:                         
                                         
                                     

	  
				
	Address				
			
	  
				
	City, State, Zip Code				

  
  

	1 	Subject to adjustment under Section 7.3.1 of the Plan. 


	2 	Subject to early termination under Section 5.6 or 7.3 of the Plan. 








 CONSENT OF SPOUSE 

In consideration of the Corporation’s execution of this Option Agreement, the undersigned spouse of the Participant agrees to be bound by
all of the terms and provisions hereof and of the Plan. 
  

					
	  
				  

	Signature of Spouse				Date


  
 2 








 Grant #«Grant» 

TERMS AND CONDITIONS OF STOCK OPTION 
  

	1.	Vesting; Limits on Exercise. 

 The Option shall vest and become exercisable in
percentage installments of the aggregate number of shares subject to the Option as set forth on the cover page of this Option Agreement. The Option may be exercised only to the extent the Option is vested and exercisable. 

 

	 	•	 	Cumulative Exercisability. To the extent that the Option is vested and exercisable, the Participant has the right to exercise the Option (to the extent not previously exercised), and such right shall continue,
until the expiration or earlier termination of the Option. 

  

	 	•	 	No Fractional Shares. Fractional share interests shall be disregarded, but may be cumulated. 

  

	 	•	 	Minimum Exercise. No fewer than 100 shares of Common Stock (subject to adjustment under Section 7.3.1 of the Plan) may be purchased at any one time, unless the number purchased is the total number at the
time exercisable under the Option. 

  

	 	•	 	ISO Value Limit. If the Option is designated as an Incentive Stock Option (an “ISO”), as indicated on the cover page of this Option Agreement, and if the aggregate fair market value of the shares
with respect to which ISOs (whether granted under the Option or otherwise) first become exercisable by the Participant in any calendar year exceeds $100,000, as measured on the applicable Award Dates, the limitations of Section 5.5.1 of the
Plan shall apply and to such extent the Option will be rendered a Nonqualified Stock Option. 

  

	2.	Continuance of Employment/Service Required; No Employment/Service Commitment. 


The vesting schedule requires continued employment or service through each applicable vesting date as a condition to the vesting of the
applicable installment of the Option and the rights and benefits under this Option Agreement. Employment or service for only a portion of the vesting period, even if a substantial portion, will not entitle the Participant to any proportionate
vesting or avoid or mitigate a termination of rights and benefits upon or following a termination of employment or services as provided in Section 4 below or under the Plan. 

Nothing contained in this Option Agreement or the Plan constitutes a continued employment or service commitment by the Corporation or any of
its Affiliates, affects the Participant’s status, if he or she is an employee, as an employee at will who is subject to termination without cause, confers upon the Participant any right to remain employed by or in service to the Corporation or
any Affiliate, interferes in any way with the right of the Corporation or any Affiliate at any time to terminate such employment or service, or affects the right of the Corporation or any Affiliate to increase or decrease the Participant’s
other compensation. 

  
 1 









	3.	Method of Exercise of Option. 

 The Option shall be exercisable by the delivery to
the Secretary of the Corporation (or such other person as the Administrator may require pursuant to such administrative exercise procedures as the Administrator may implement from time to time) of: 

 

	 	•	 	an executed Exercise Agreement (stating the number of shares of Common Stock to be purchased pursuant to the Option) in substantially the form attached hereto as Exhibit A or such other form as the Administrator may
require from time to time (the “Exercise Agreement”); 

  

	 	•	 	payment in full for the Exercise Price of the shares to be purchased, in cash or by electronic funds transfer to the Corporation, or by certified or cashier’s check payable to the order of the Corporation subject
to such specific procedures or directions as the Administrator may establish; 

  

	 	•	 	any written statements or agreements required pursuant to Section 7.5.1 of the Plan; and 

  

	 	•	 	satisfaction of the tax withholding provisions of Section 7.6 of the Plan. 

 The Administrator also may,
but is not required to, authorize a non-cash payment alternative specified below at or prior to the time of exercise. In which case, the Exercise Price and/or applicable withholding taxes, to the extent so authorized, may be paid in full or in part
by delivery to the Corporation of: 
  

	 	•	 	shares of Common Stock already owned by the Participant, valued at their Fair Market Value on the exercise date; and/or 

  

	 	•	 	if the Common Stock is then registered under the Exchange Act and listed or quoted on a recognized national securities exchange, irrevocable instructions to a broker to, upon exercise of the Option, promptly sell a
sufficient number of shares of Common Stock acquired upon exercise of the Option and deliver to the Corporation the amount necessary to pay the Exercise Price (and, if applicable, the amount of any related tax withholding obligations); and/or


  

	 	•	 	a note meeting the requirements of Section 5.3.3 of the Plan (or, in the case of tax loans, Section 7.6 of the Plan). 


An Option will qualify as an ISO only if it meets all of the applicable requirements of the Code. If the Option is designated as an ISO, the Option may be
rendered a Nonqualified Stock Option if the Administrator permits the use of one or more of the non-cash payment alternatives referenced above. 

  
 2 









	4.	Early Termination of Option. 

 The Option, to the extent not previously
exercised, and all other rights in respect thereof, whether vested and exercisable or not, shall terminate and become null and void prior to the Expiration Date in the event of: 

 

	 	•	 	the termination of the Participant’s employment or services as provided in Section 5.6 of the Plan, or 

  

	 	•	 	the termination of the Option pursuant to Section 7.3 of the Plan. 

 Notwithstanding any
post-termination exercise period provided for herein or in the Plan, an Option will qualify as an ISO only if it is exercised within the applicable exercise periods for ISOs under, and meets all of the other requirements of, the Code. If the Option
is designated as an ISO and is not exercised within the applicable exercise periods for ISOs or does not meet such other requirements, the Option will be rendered a Nonqualified Stock Option. 

 

	5.	Non-Transferability and Other Restrictions. 

 The Option and any other rights of
the Participant under this Option Agreement or the Plan are nontransferable and exercisable only by the Participant, except as set forth in Section 7.2 of the Plan. Any shares of Common Stock issued on exercise of the Option are subject to
substantial restrictions on transfer, and are subject to rights of first refusal and other rights in favor of the Corporation as set forth herein and in the Exercise Agreement. 

 

	6.	Securities Law Compliance. 

 The Participant acknowledges that the Option and the
shares of Common Stock are not being registered under the Securities Act, based, in part, in reliance upon an exemption from registration under Securities and Exchange Commission Rule 701 promulgated under the Securities Act, and a comparable
exemption from qualification under applicable state securities laws, as each may be amended from time to time. The Participant, by executing this Option Agreement, hereby makes the following representations to the Corporation and acknowledges that
the Corporation’s reliance on federal and state securities law exemptions from registration and qualification is predicated, in substantial part, upon the accuracy of these representations: 

 

	 	•	 	The Participant is acquiring the Option and, if and when he/she exercises the Option, will acquire the shares of Common Stock solely for the Participant’s own account, for investment purposes only, and not with a
view to or an intent to sell, or to offer for resale in connection with any unregistered distribution, all or any portion of the shares within the meaning of the Securities Act and/or any applicable state securities laws. 


 

	 	•	 	The Participant has had an opportunity to ask questions and receive answers from the Corporation regarding the terms and conditions of the Option and the restrictions imposed on any shares of Common Stock purchased upon
exercise of the Option. The Participant has been furnished with, and/or has access to, such information as he or she considers necessary or appropriate for deciding whether to exercise the Option and purchase shares of Common Stock. However, in
evaluating the merits and risks of an investment in the Common Stock, the Participant has and will rely upon the advice of his/her own legal counsel, tax advisors, and/or investment advisors. 


  
 3 









	 	•	 	The Participant is aware that the Option may be of no practical value, that any value it may have depends on its vesting and exercisability as well as an increase in the Fair Market Value of the underlying shares of
Common Stock to an amount in excess of the Exercise Price, and that any investment in common shares of a closely held corporation such as the Corporation is non-marketable, non-transferable and could require capital to be invested for an indefinite
period of time, possibly without return, and at substantial risk of loss. 

  

	 	•	 	The Participant understands that any shares of Common Stock acquired on exercise of the Option will be characterized as “restricted securities” under the federal securities laws, and that, under such laws and
applicable regulations, such securities may be resold without registration under the Securities Act only in certain limited circumstances, including in accordance with the conditions of Rule 144 promulgated under the Securities Act, as presently in
effect, with which the Participant is familiar. 

  

	 	•	 	The Participant has read and understands the restrictions and limitations set forth in the Plan, this Option Agreement (including these Terms), and the Exercise Agreement, which are imposed on the Option and any shares
of Common Stock which may be acquired upon exercise of the Option. 

  

	 	•	 	At no time was an oral representation made to the Participant relating to the Option or the purchase of shares of Common Stock and the Participant was not presented with or solicited by any promotional meeting or
material relating to the Option or the Common Stock. 

  

	7.	Lock-Up Agreement. 

 Neither the Participant (nor any permitted transferee) may,
directly or indirectly, offer, sell or transfer or dispose of any of the shares of Common Stock acquired upon exercise of the Option (the “Shares”) or any interest therein (or agree to do any thereof) (collectively, a
“Transfer”) during the period commencing as of 14 days prior to and ending 180 days, or such lesser period of time as the relevant underwriters may permit (or such other period as may be requested by the Corporation or an
underwriter to accommodate regulatory restrictions on (a) the publication or other distribution of research reports and (b) analyst recommendations and opinions, including, but not limited to, the restrictions contained in FINRA Rule
2711(f)(4) or NYSE Rule 472(f)(4), or any successor provisions or amendments thereto), after the effective date of a registration statement covering any public offering of the Corporation’s securities of which the Participant has notice. (The
term “Participant” includes, where the context so requires, any permitted direct or indirect transferee of the Participant.) The Participant shall agree and consent to the entry of stop transfer instructions with the Corporation’s
transfer agent against the Transfer of the Corporation’s securities beneficially owned by the Participant and shall confirm the limitations hereunder and under the Exercise Agreement by agreement with and for the benefit of the relevant
underwriters by a lock-up agreement or other agreement in customary form. Notwithstanding anything else herein to the contrary, this Section 7 shall not be construed so as to prohibit the Participant from participating in a registration or a
public offering of the Common Stock with respect to any shares which he or she may hold at that time, provided, however, that such participation shall be at the sole discretion of the Board. 

  
 4 









	8.	Right of First Refusal. 

 The Corporation shall have a right of first refusal, as
set forth below, to purchase the Shares acquired upon exercise of the Option before the Shares (or any interest in them) can be validly transferred to any other person or entity. 

8.1 Notice of Intent to Sell. Before there can be a valid sale or transfer of any Shares (or any interest in them) by any holder
thereof, the holder shall first give notice in writing to the Corporation, mailed or delivered in accordance with the provisions of Section 9, of his or her intention to sell or transfer such Shares (the “Option Notice”). 

The Option Notice shall specify the identity of the proposed transferee, the number of Shares to be sold or transferred to the transferee, the
price per Share and the terms upon which such holder intends to make such sale or transfer. If the payment terms for the Shares described in the Option Notice differ from delivery of cash or a check at closing, the Corporation shall have the option,
as set forth herein, of purchasing the Shares for cash (or a cash equivalent) at closing in an amount which the Corporation determines is a fair value equivalent of that payment. The determination of a fair value equivalent shall be made in the
Corporation’s best judgment and such determination shall be mailed or delivered to the selling or transferring stockholder (the “Corporation’s Notice”) within ten (10) days of its receipt of the Option Notice. Should
the selling or transferring stockholder disagree with the Corporation’s determination of a fair value equivalent, he or she shall have the right (the “Retraction Right”) to retract the proposed sale or transfer to a third party
and the offer of Shares to the Corporation pursuant to the Option Notice (such retraction to be made in writing and mailed or delivered in accordance with the provisions of Section 9). If the stockholder again proposes to sell or transfer the
Shares, the stockholder shall again offer such Shares to the Corporation pursuant to the terms of this Section 8 prior to any sale or transfer. 

8.2 Option to Purchase. Subject to the selling stockholder’s Retraction Right, during the 60-day period commencing upon receipt of
the Option Notice by the Corporation (the “Option Period”), the Corporation shall have an option to purchase any or all of the Shares specified in the Option Notice at the price offered therein (the “Right of First
Refusal”). 
 8.3 Purchase of Shares. Not more than thirty (30) days after receipt of the Option Notice, the
Corporation shall give written notice to the stockholder desiring to sell or transfer Shares of the number of such Shares to be purchased (or, if no Shares are to be purchased, stating such fact) by the Corporation pursuant to the terms of this
Section 8 (the “Purchase Notice”). Purchases pursuant to this Section 8 shall be consummated within thirty (30) days after delivery of the Purchase Notice to the selling stockholder, but in no event later than the
expiration of the Option Period. The purchase price shall be paid at the closing in cash, by check, by cancellation of money purchase indebtedness, or, if the payment terms set forth in the Option Notice differ from payment in cash or by check at
closing, in accordance with the payment terms set forth in the Option Notice (or payment of the amount set forth in the Corporation’s Notice in cash, by cancellation of money purchase indebtedness, or by check). The purchase price shall be paid
against surrender by the selling stockholder of a stock certificate evidencing the number of Shares specified in the Option Notice, with duly endorsed stock powers. 

  
 5 








 8.4 Ability to Sell Unpurchased Shares. Unless all of the Shares referred to in the Option
Notice are to be purchased as indicated in the Purchase Notice, the stockholder desiring to sell or transfer may dispose of any Shares referred to in the Option Notice that are not to be purchased by the Corporation to the person or persons
specified in the Option Notice during a period of twenty (20) days commencing upon his or her receipt of the Purchase Notice; provided, however, that he or she shall not sell or transfer such Shares (a) at a lower price or on terms
more favorable to the purchaser or transferee than those specified in the Option Notice, or (b) to a person other than the person or persons specified in the Option Notice; and provided further that such transfer is consistent with the
other provisions and limitations of the Plan, this Option Agreement (including these Terms), and the Exercise Agreement. If the transfer is not consummated within such twenty (20) day period, the stockholder shall again offer such Shares to the
Corporation pursuant to the terms of this Section 8 prior to any sale or transfer to the same or any other person. 
 8.5
Assignment. Notwithstanding anything to the contrary, the Corporation may assign any or all of its rights under this Section 8 to one or more stockholders of the Corporation. 

8.6 Termination of Right of First Refusal. The Corporation’s Right of First Refusal shall terminate to the extent that it is not
exercised prior to the Public Offering Date. 
 8.7 No Stockholder Rights Following Repurchase. 

If the Participant (or any permitted transferee) holds Shares as to which the Right of First Refusal has been exercised (in connection with the
termination of the Participant’s employment or otherwise), the Participant shall be entitled to payment in accordance with the provisions of this Section 8 but (unless otherwise required by law) shall no longer be entitled to participation
in the Corporation or other rights as a stockholder with respect to the shares subject to the repurchase. To the maximum extent permitted by law, the Participant’s rights following the exercise of the Right of First Refusal shall, with respect
to the repurchase and the Shares covered thereby, be solely the rights that he or she has as a general creditor of the Corporation to receive payment of the amount specified in this Section 8. 

 

	9.	Notices. 

 Any notice to be given under the terms of this Option Agreement or the
Exercise Agreement shall be in writing and addressed to the Corporation at its principal office to the attention of the Secretary, and to the Participant at the address reflected or last reflected on the Corporation’s payroll records. Any
notice shall be delivered in person or shall be enclosed in a properly sealed envelope, addressed as aforesaid, registered or certified, and deposited (postage and registry or certification fee prepaid) in a post office or branch post office
regularly maintained by the United States Government. Any such notice shall be given only when received, but if the Participant is no longer an Eligible Person, shall be deemed to have been duly given five business days after the date mailed in
accordance with the foregoing provisions of this Section 9. 

  
 6 









	10.	Plan. 

 The Option and all rights of the Participant under this Option Agreement
are subject to the terms and conditions of the Plan, incorporated herein by this reference. The Participant agrees to be bound by the terms of the Plan and this Option Agreement (including these Terms). The Participant acknowledges having read and
understood the Plan, the Stock Option Questions & Answers for the Plan, and this Option Agreement. Unless otherwise expressly provided in other sections of this Option Agreement, provisions of the Plan that confer discretionary authority on
the Board or the Administrator do not and shall not be deemed to create any rights in the Participant unless such rights are expressly set forth herein or are otherwise in the sole discretion of the Board or the Administrator so conferred by
appropriate action of the Board or the Administrator under the Plan after the date hereof. 
  

	11.	Entire Agreement. 

 This Option Agreement (including these Terms and together with
the form of Exercise Agreement attached hereto) and the Plan together constitute the entire agreement and supersede all prior understandings and agreements, written or oral, of the parties hereto with respect to the subject matter hereof. The Plan,
this Option Agreement and the Exercise Agreement may be amended pursuant to Section 7.7 of the Plan. Such amendment must be in writing and signed by the Corporation. The Corporation may, however, unilaterally waive any provision hereof or of
the Exercise Agreement in writing to the extent such waiver does not adversely affect the interests of the Participant hereunder, but no such waiver shall operate as or be construed to be a subsequent waiver of the same provision or a waiver of any
other provision hereof. 
  

	12.	Satisfaction of All Rights to Equity. 

 The Option is in complete satisfaction of
any and all rights that the Participant may have (under an employment, consulting, or other written or oral agreement with the Corporation or any of its Affiliates, or otherwise) to receive (1) stock options or stock awards with respect to the
securities of the Corporation or any of its Affiliates, and/or (2) any other equity or derivative security in or with respect to the Corporation or any of its Affiliates. This Option Agreement supersedes the terms of all prior understandings
and agreements, written or oral, of the parties with respect to such matters. The Participant shall have no further rights or benefits under any prior agreement conveying any right with respect to any security or derivative security in or with
respect to the Corporation or any of its Affiliates. The foregoing notwithstanding, this Section 12 shall not adversely affect the Participant’s rights under any prior stock option or stock award agreement under the Plan (provided such
agreement is expressly labeled as a stock option or stock award agreement under the Plan and is similar in form to this Option Agreement) which has been signed by an authorized officer of the Corporation. 

  
 7 









	13.	Governing Law; Limited Rights; Severability. 

 13.1. Delaware Law;
Construction. This Option Agreement and the Exercise Agreement shall be governed by and construed and enforced in accordance with the laws of the State of Delaware without regard to conflict of law principles thereunder. The terms of the Option
grant have resulted from the negotiations of the parties and each of the parties has had an opportunity to obtain and consult with its own counsel. The language of all parts of the Plan, this Option Agreement (including these Terms) and the Exercise
Agreement shall in all cases be construed as a whole, according to its fair meaning, and not strictly for or against either of the parties. 

13.2. Limited Rights. The Participant has no rights as a stockholder of the Corporation with respect to the Option as set forth in
Section 7.8 of the Plan. The Option does not place any limit on the corporate authority of the Corporation as set forth in Section 7.15 of the Plan. 

13.3. Arbitration. Any controversy arising out of or relating to this Option Agreement (including these Terms), the Plan, and/or the
Exercise Agreement, their enforcement or interpretation, or because of an alleged breach, default, or misrepresentation in connection with any of their provisions, or any other controversy arising out of or related to the Option, including, but not
limited to, any state or federal statutory claims, shall be submitted to arbitration in San Francisco County, California, before a sole arbitrator selected from Judicial Arbitration and Mediation Services, Inc., San Francisco, California, or its
successor (“JAMS”), or if JAMS is no longer able to supply the arbitrator, such arbitrator shall be selected from the American Arbitration Association, and shall be conducted in accordance with the provisions of California Code of
Civil Procedure §§ 1280 et seq. as the exclusive forum for the resolution of such dispute; provided, however, that provisional injunctive relief may, but need not, be sought by either party to this Option Agreement in a court of law while
arbitration proceedings are pending, and any provisional injunctive relief granted by such court shall remain effective until the matter is finally determined by the arbitrator. Final resolution of any dispute through arbitration may include any
remedy or relief which the arbitrator deems just and equitable, including any and all remedies provided by applicable state or federal statutes. At the conclusion of the arbitration, the arbitrator shall issue a written decision that sets forth the
essential findings and conclusions upon which the arbitrator’s award or decision is based. Any award or relief granted by the arbitrator hereunder shall be final and binding on the parties hereto and may be enforced by any court of competent
jurisdiction. The parties acknowledge and agree that they are hereby waiving any rights to trial by jury in any action, proceeding or counterclaim brought by either of the parties against the other in connection with any matter whatsoever arising
out of or in any way connected with any of the matters referenced in the first sentence above. The parties agree that Corporation shall be responsible for payment of the forum costs of any arbitration hereunder, including the arbitrator’s fee.
The parties further agree that in any proceeding with respect to such matters, each party shall bear its own attorney’s fees and costs (other than forum costs associated with the arbitration) incurred by it or him or her in connection with the
resolution of the dispute. 
 13.4. Severability. If the arbitrator selected in accordance with Section 13.3 or a court of
competent jurisdiction determines that any portion of this Option Agreement, the Plan, or the Exercise Agreement is in violation of any statute or public policy, then only the portions of this Option Agreement, the Plan, or the Exercise Agreement,
as applicable, which violate such statute or public policy shall be stricken, and all portions of this Option Agreement, the Plan, and the Exercise Agreement which do not violate any statute or public policy shall continue in full force and effect.
Furthermore, it is the parties’ intent that any court order striking any portion of this Option Agreement, the Plan, and/or the Exercise Agreement should modify the stricken terms as narrowly as possible to give as much effect as possible to
the intentions of the parties hereunder. 

  
 8 








 13.5. Stockholder Approval. Notwithstanding anything else contained herein
to the contrary, the Option and all rights of the Participant under this Option Agreement are subject to approval of the Plan by the Corporation’s stockholders (such approval to be obtained in accordance with the terms of the Plan, the
Corporation’s Bylaws, and applicable law) within 12 months after the Effective Date of the Plan. 
  

	14.	Clawback Policy. 

 The Option is subject to the terms of the Corporation’s
recoupment, clawback or similar policy as it may be in effect from time to time, as well as any similar provisions of applicable law, any of which could in certain circumstances require forfeiture of the Option and repayment or forfeiture of any
shares of Common Stock or other cash or property received with respect to the Option (including any value received from a disposition of the shares acquired upon exercise of the Option). 

 

	15.	No Advice Regarding Grant. 

 The Participant is hereby advised to consult with his
or her own tax, legal and/or investment advisors with respect to any advice the Participant may determine is needed or appropriate with respect to the Option (including, without limitation, to determine the foreign, state, local, estate and/or gift
tax consequences with respect to the Option and any shares that may be acquired upon exercise of the Option). Neither the Corporation nor any of its officers, directors, affiliates or advisors makes any representation (except for the terms and
conditions expressly set forth in this Option Agreement) or recommendation with respect to the Option. Except for the withholding rights contemplated by Section 3 above and Section 7.6 of the Plan, the Participant is solely responsible for
any and all tax liability that may arise with respect to the Option and any shares that may be acquired upon exercise of the Option. 

(Remainder of Page Intentionally Left Blank) 

  
 9 








 EXHIBIT A 

CYTOMX THERAPEUTICS, INC. 

2011 STOCK INCENTIVE PLAN 

OPTION EXERCISE AGREEMENT 

The undersigned (the “Purchaser”) hereby irrevocably elects to exercise his/her right, evidenced by that certain Stock Option
Agreement dated as of                              (the “Option Agreement”) under the
CytomX Therapeutics, Inc. 2011 Stock Incentive Plan (the “Plan”), as follows: 
  

	 	•	 	the Purchaser hereby irrevocably elects to purchase
                             shares of Common Stock, par value $0.00001 per share (the
“Shares”), of CytomX Therapeutics, Inc., a Delaware corporation (the “Corporation”), and 

  

	 	•	 	such purchase shall be at the price of $                             per
share, for an aggregate amount of $                             (subject to applicable withholding
taxes pursuant to Section 7.6 of the Plan). 

 Capitalized terms are defined in the Plan if not defined herein. 

1. Delivery of Share Certificate. The Purchaser requests that a certificate representing the Shares be registered to Purchaser and
delivered to:
                                         
                                         
                                         
             . 
 2. Investment Representations. The Purchaser
acknowledges that the sale of the Shares by the Purchaser is restricted by Securities and Exchange Commission Rules 701(g) and 144. The Purchaser hereby affirms as made as of the date hereof the representations in Section 6 of the “Terms
and Conditions of Stock Option” (which are attached to and a part of the Option Agreement, the “Terms”) and such representations are incorporated herein by this reference. The Purchaser represents that he/she has no need for
liquidity in this investment, has the ability to bear the economic risk of this investment, and can afford a complete loss of the purchase price for the Shares. 

The Purchaser also understands and acknowledges (a) that the certificates representing the Shares will be legended as provided for in
Section 7.5.3 of the Plan, and (b) that the Corporation has no obligation to register the Shares or file any registration statement under federal or state securities laws. 

3. Limitation on Disposition and Other Restrictions. The Shares are subject to and the Purchaser hereby agrees to the following terms
and conditions of the sale of the Shares to the Purchaser: 
  

	 	•	 	any transfer of the Shares must comply with the restrictions on transfer set forth in Section 7.2 of the Plan and all applicable laws as set forth in Section 7.5 of the Plan; 


  
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	 	•	 	the Shares are subject to, and following any otherwise permitted transfer of the Shares, the Shares shall remain subject to and the transferee shall be bound by, the lock-up provisions set forth in Section 7 of the
Terms, the Corporation’s right of first refusal set forth in Section 8 of the Terms, the share legend requirements of Section 7.5.3 of the Plan, the foregoing provisions of this Section 3, and the arbitration provisions of
Section 13.3 of the Terms; and 

  

	 	•	 	as a condition to any otherwise permitted transfer of the Shares, the Corporation may require the transferee to execute a written agreement, in a form acceptable to the Administrator, that the transferee acknowledges
and agrees to the foregoing terms and restrictions imposed on the Shares. 

 4. Plan and Option Agreement. The
Purchaser acknowledges that all of his/her rights are subject to, and the Purchaser agrees to be bound by, all of the terms and conditions of the Plan and the Option Agreement (including the Terms), both of which are incorporated herein by this
reference. If a conflict or inconsistency between the terms and conditions of this Exercise Agreement and of the Plan or the Option Agreement shall arise, the terms and conditions of the Plan and/or the Option Agreement shall govern. The Purchaser
acknowledges receipt of a copy of all documents referenced herein (including the Terms and the Stock Option Questions & Answers for the Plan) and acknowledges reading and understanding these documents and having an opportunity to ask any
questions that he/she may have had about them. Any controversy or claim arising out of or relating to this Exercise Agreement shall be submitted to arbitration in accordance with Section 13.3 of the Terms, and Delaware law shall apply as
provided in Section 13.1 of the Terms. 
 5. Entire Agreement. This Exercise Agreement, the Option Agreement (including the
Terms), and the Plan together constitute the entire agreement and supersede all prior understandings and agreements, written or oral, of the parties hereto with respect to the subject matter hereof. The Plan, the Option Agreement and this Exercise
Agreement may be amended pursuant to Section 7.7 of the Plan. Such amendment must be in writing and signed by the Corporation. The Corporation may, however, unilaterally waive any provision hereof or of the Option Agreement in writing to the
extent such waiver does not adversely affect the interests of the Purchaser hereunder, but no such waiver shall operate as or be construed to be a subsequent waiver of the same provision or a waiver of any other provision hereof. 

6. Notice of Sale of ISO Shares. If the Shares are being acquired upon exercise of an Option intended to qualify as an Incentive Stock
Option, the Purchaser agrees that, upon any sale or other transfer of the Shares within either one year of the date that they are acquired by the Purchaser or two years after the Award Date set forth in the Option Agreement, the Purchaser shall
provide the notice required under Section 5.5.3 of the Plan. 

  
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	“PURCHASER”				 ACCEPTED BY:
 CYTOMX THERAPEUTICS,
INC.,
 a Delaware corporation

	  
				
	Signature				
	 «Name»
			
By:                         
                                         
                                   

 

	Print Name				Its:                                     
                                         
                        
	  

Date
				  
 (To be completed by the corporation after the price (including
applicable withholding taxes), value (if applicable) and receipt of funds is verified.)



  
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