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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1501989	Cytomx Therapeutics Inc.	CTMX	()	4

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1180428	J Mark Levin	29 Newbury Street, 3Rd Floor Boston MA 02116	No	No	Yes	No
1192595	I Robert Tepper	29 Newbury Street, 3Rd Floor Boston MA 02116	No	No	Yes	No
1192603	P Kevin Starr	29 Newbury Street, 3Rd Floor Boston MA 02116	No	No	Yes	No
1408591	Third Rock Ventures Lp	29 Newbury Street, 3Rd Floor Boston MA 02116	No	No	Yes	No
1578973	Trv Gp, Llc	29 Newbury Street, 3Rd Floor Boston MA 02116	No	No	Yes	No
1578976	Third Rock Ventures Gp, L.p.	29 Newbury Street, 3Rd Floor Boston MA 02116	No	No	Yes	No

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	Disposition	2017-03-23	1,000,000	$17.00	5,820,348	No	4	S	Direct
Common Stock	Disposition	2017-03-27	650,000	$18.00	5,170,348	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	S	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership
Common Stock	59,776	Direct
Common Stock	59,776	Direct
Common Stock	59,777	Direct

Footnotes

These shares are directly held by Third Rock Ventures, L.P. ("TRV"). The general partner of TRV is Third Rock Ventures GP, L.P. ("TRV GP"). The general partner of TRV GP is TRV GP, LLC ("TRV GP LLC"). The individual managers of TRV GP LLC are Mark Levin ("Levin"), Kevin Starr ("Starr") and Dr. Robert Tepper ("Tepper"). Each of TRV GP, TRV GP LLC, Levin, Starr and Tepper disclaims beneficial ownership of the shares except to the extent of its or his pecuniary interest therein, if any, and this report shall not be deemed an admission that it or he is the beneficial owner of such shares.
This price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.00 to $18.45, inclusive. Each of the reporting persons undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2).
These shares are directly held by Starr.
These shares are directly held by Levin.
These shares are directly held by Tepper.