X0306 4 2017-06-01 0 0001302573 OncoMed Pharmaceuticals Inc OMED 0001201256 WYZGA MICHAEL S C/O ONCOMED PHARMACEUTICALS, INC. 800 CHESAPEAKE DRIVE REDWOOD CITY CA 94063 1 0 0 0 Stock Option (Right to Buy) 3.30 2017-06-01 4 A 0 15000 0.00 A 2027-06-01 Common Stock 15000 15000 D The option vests as to 100% of the shares subject thereto upon the earlier of one year following the grant date or the date of the subsequent year's annual meeting of stockholders, subject to the Reporting Person's continued service to the Issuer through such vesting date. /s/ Alicia J. Hager, Attorney-in-Fact for Michael Wyzga 2017-06-02