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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	Insider Title	Director	Officer	Large Shareholder	Other
1538676	L.p. Ix Canaan	285 Riverside Avenue, Suite 250 Westport CT 06880		Yes	No	Yes	No
1654586	Canaan Partners Ix Llc	285 Riverside Avenue, Suite 250 Westport CT 06880		Yes	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	2016-11-09	13,730	$11.03	3,930,651	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See Footnote

Footnotes

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.00 - $11.15, inclusive. The reporting persons undertake 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 range set forth in footnote (1) of this Form 4.
The shares are held directly by Canaan IX L.P. (the "Canaan Fund"). Canaan Partners IX LLC ("Canaan IX" and together with the Canaan Fund, the "Canaan Entities") is the sole general partner of the Canaan Fund, and each may be deemed to have sole voting, investment and dispositive power with respect to the shares held by the Canaan Fund. Timothy Shannon, a non-managing member of Canaan IX, serves as representative of the Canaan Entities on the issuer's board of directors. Canaan IX disclaims Section 16 beneficial ownership of the securities held by the Canaan Fund, except to the extent of its pecuniary interest therein, if any.