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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1501989	Cytomx Therapeutics Inc.	CTMX	Pharmaceutical Preparations (2834)	000000000

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1009258	Deerfield Management Co	780 Third Avenue, 37Th Floor New York NY 10017	No	No	Yes	Yes
1010823	L.p. Mgmt Deerfield	780 Third Avenue 37Th Floor New York NY 10017	No	No	Yes	Yes
1352546	E James Flynn	780 Third Avenue 37Th Floor New York NY 10017	No	No	Yes	Yes
1354395	Deerfield Special Situations Fund, L.p.	780 3Rd Avenue 37Th Floor New York NY 10017	No	No	Yes	Yes
1603333	Deerfield Private Design Fund Iii, L.p.	780 Third Avenue, 37Th Floor New York NY 10017	No	No	Yes	Yes
1610540	Deerfield Mgmt Iii, L.p.	780 Third Avenue, 37Th Floor New York NY 10017	No	No	Yes	Yes

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2015-10-14	160,512	$0.00	160,512	No	4	C	Indirect	Through Deerfield Private Design Fund III, L.P.
Common Stock	Acquisiton	2015-10-14	160,512	$0.00	160,512	No	4	C	Indirect	Through Deerfield Special Situations Fund, L.P.
Common Stock	Acquisiton	2015-10-14	510,512	$12.00	671,024	No	4	P	Indirect	Through Deerfield Private Design Fund III, L.P.
Common Stock	Acquisiton	2015-10-14	114,488	$12.00	275,000	No	4	P	Indirect	Through Deerfield Special Situations Fund, L.P.

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	Through Deerfield Private Design Fund III, L.P.
No	4	C	Indirect	Through Deerfield Special Situations Fund, L.P.
No	4	P	Indirect	Through Deerfield Private Design Fund III, L.P.
No	4	P	Indirect	Through Deerfield Special Situations Fund, L.P.

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series D Convertible Preferred Stock	Disposition	2015-10-14	160,512	$0.00	160,512	$0.00
Common Stock	Series D Convertible Preferred Stock	Disposition	2015-10-14	160,512	$0.00	160,512	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	C	Indirect
0			No	4	C	Indirect

Footnotes

Shares of Series D Convertible Preferred Stock had no expiration date and automatically converted into shares of the Issuer's common stock on a one-for-one basis upon the closing of the Issuer's initial public offering of common stock.
This Form 4 is being filed by the undersigned as well as the entities listed on the Joint Filer Information Statement attached as an exhibit hereto (the "Reporting Persons"). Deerfield Mgmt III, L.P. is the general partner of Deerfield Private Design Fund III, L.P. ("Fund III") and Deerfield Mgmt, L.P. is the general partner of Deerfield Special Situations Fund, L.P. (together with Fund III, the "Funds"). Deerfield Management Company, L.P. is the investment manager of the Funds. James E. Flynn is the sole member of the general partner of each of Deerfield Mgmt III, L.P., Deerfield Mgmt, L.P. and Deerfield Management Company, L.P.
In accordance with Instruction 4 (b)(iv) to Form 4, the entire amount of the Issuer's securities held by the Funds is reported herein. For purposes of Section 16 of the Securities Exchange Act of 1934, as amended, each Reporting Person disclaims beneficial ownership of any such securities, except to the extent of his/its indirect pecuniary interest therein, if any, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of such securities for purposes of Section 16 or otherwise.