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
                                                                                  
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response... 0.5
                      
Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

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 (MM/DD/YYYY)

4/8/2019
(Street)

SANTA BARBARA, CA 91308
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

4/10/2019 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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   4/8/2019     G   V 3900   D $0   237015   (1) D    
Common Stock                  271643   (1) I   By Frederick W. Gluck 1997 Family Trust dtd July 28, 1997   (2)

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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

Explanation of Responses:
(1)  The Form 4 filed on 4/10/2019 incorrectly reported a gift of 3,900 shares by the Frederick W. Gluck 1997 Family Trust dtd July 28, 1997 ("Family Trust"). The 3,900 shares were gifted from the directly held shares, not the Family Trust. Additionally, previous filings made by the Reporting Person following 8/11/2016 inadvertently excluded the directly held shares from Table I. This Form 4/A amendment is filed to correct the aforementioned errors. Except as otherwise noted in this Form 4/A, all other information disclosed in the Reporting Person's original Form 4 filed with the Securities and Exchange Commission on 4/10/2019 was accurately reported.
(2)  The Reporting Person is a trustee of Frederick W. Gluck 1997 Family Trust dtd July 28, 1997.

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/ Debanjan Ray, as Attorney-in-Fact for Frederick W. Gluck 5/9/2019
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
CytomX Therapeutics (NASDAQ:CTMX)
Historical Stock Chart
From Mar 2024 to Apr 2024 Click Here for more CytomX Therapeutics Charts.
CytomX Therapeutics (NASDAQ:CTMX)
Historical Stock Chart
From Apr 2023 to Apr 2024 Click Here for more CytomX Therapeutics Charts.