X0306 4 2017-04-04 0 0001302573 OncoMed Pharmaceuticals Inc OMED 0001309702 HASTINGS PAUL J C/O ONCOMED PHARMACEUTICALS, INC. 800 CHESAPEAKE DRIVE SAN FRANCISCO CA 94063 1 1 0 0 Chairman & CEO Common Stock 2017-04-04 4 S 0 48 8.8671 D 39011 D Common Stock 2017-04-04 4 S 0 6425 9.0582 D 32586 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 14,000 restricted stock units ("RSUs"). The reporting person is entitled to receive one (1) share of common stock of the issuer for each one (1) RSU upon the vesting thereof. Includes 1,736 shares acquired under the Issuer's Employee Stock Purchase Plan on February 28, 2017. 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 J. Hager, Attorney-in-Fact for Paul Hastings 2017-04-05