Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
GLUCK FREDERICK W
  2. Issuer Name and Ticker or Trading Symbol
CytomX Therapeutics, Inc. [CTMX]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
743 SAN YSIDRO ROAD
3. Date of Earliest Transaction (Month/Day/Year)
08/09/2016
(Street)

SANTA BARBARA, CA 91308
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 08/09/2016   M   31,767 A $ 1.1339 179,558 D  
Common Stock 08/09/2016   M   16,612 A $ 0.945 196,170 D  
Common Stock 08/09/2016   M   27,606 A $ 1.4489 223,776 D  
Common Stock 08/09/2016   M   17,139 A $ 1.5749 240,915 D  
Common Stock               331,643 I By Frederick W. Gluck 1997 Family Trust dtd July 28, 1997 (1)
Common Stock               22,111 I By Richlin Partners, LLC (2)
Common Stock               3,200 I By spouse

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (right to buy) $ 1.1339 08/09/2016   M     31,767   (3) 03/23/2021 Common Stock 31,767 $ 0 0 D  
Stock Option (right to buy) $ 0.945 08/09/2016   M     16,612   (3) 02/25/2023 Common Stock 16,612 $ 0 0 D  
Stock Option (right to buy) $ 1.4489 08/09/2016   M     27,606   (3) 05/23/2024 Common Stock 27,606 $ 0 0 D  
Stock Option (right to buy) $ 1.5749 08/09/2016   M     17,139   (3) 02/08/2025 Common Stock 17,139 $ 0 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
GLUCK FREDERICK W
743 SAN YSIDRO ROAD
SANTA BARBARA, CA 91308
  X      

Signatures

 /s/ Cynthia J. Ladd, as Attorney-in-Fact for Frederick W. Gluck   08/11/2016
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The Reporting Person is a trustee of Frederick W. Gluck 1997 Family Trust dtd July 28, 1997.
(2) Richlin Partners, LLC is an entity owned of record by the spouse of the Reporting Person.
(3) 100% of the shares subject to the option are fully vested and exercisable.

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