Huh Hoyoung Form 3 CytomX Therapeutics / Hoyoung Huh ownership change

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Huh Hoyoung

(Last) (First) (Middle)

343 OYSTER POINT BLVD.

SUITE 100

(Street)

SOUTH SAN FRANCISCO CA 94080

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
10/07/2015

3. Issuer Name and Ticker or Trading Symbol
CytomX Therapeutics, Inc. [ CTMX ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
Chairman of the Board

5. If Amendment, Date of 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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (right to buy)	05/23/2012	05/22/2022	Common Stock	7,941	1.2599	D
Stock Option (right to buy)	(1)	05/22/2022	Common Stock	95,301	1.2599	D
Stock Option (right to buy)	(2)	01/16/2024	Common Stock	146,325	1.3859	D
Stock Option (right to buy)	(3)	05/23/2024	Common Stock	110,426	1.4489	D

Explanation of Responses:

1. This option vested in 24 substantially equal monthly installments starting on the last day of January 2012.

2. This option vests in 24 substantially equal monthly installments starting on January 1, 2014, with each additional installment vesting on the last day of the month starting in February 2014.

3. This option vests in 24 substantially equal monthly installments starting on the last day of January 2014.

Remarks:

Exhibit 24.1 - Power of Attorney

	/s/ Cynthia J. Ladd, attorney-in-fact	10/07/2015
	** 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 5 (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).
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