X0306 4 2016-01-06 0 0001302573 OncoMed Pharmaceuticals Inc OMED 0001309702 HASTINGS PAUL J C/O ONCOMED PHARMACEUTICALS, INC. 800 CHESAPEAKE DRIVE REDWOOD CITY CA 94063 1 1 0 0 Chairman & CEO Common Stock 2016-01-06 4 S 0 2335 22.3006 D 22102 D Common Stock 2016-01-06 4 S 0 77 21.5425 D 22025 D Common Stock 324840 I See Footnote Pursuant to a sell-to-cover election made by the Reporting Person at the time of the initial grant of the restricted stock unit award, the shares were sold upon the vesting of restricted stock units solely to cover applicable withholding taxes. Includes an aggregate of 1,206 shares acquired under the Issuer's Employee Stock Purchase Plan on February 27, 2015 and August 31, 2015. Includes 16,875 restricted stock units. The Reporting Person is entitled to receive one (1) share of common stock for each one (1) restricted stock unit. The shares are held by Paul J. Hastings & Steve N. De Jong, Trustors and/or TTEES, The Hastings-De Jong Lv Tr DTD May 1, 2012. /s/ Alicia Hager, Attorney-in-Fact for Paul Hastings 2016-01-08