OncoMed to Present at Two Upcoming Investor Conferences in September

OncoMed Pharmaceuticals, Inc. (NASDAQ:OMED), a clinical-stage biopharmaceutical company focused on discovering and developing novel anti-cancer therapeutics, today announced that John Lewicki, Ph.D., President and Chief Executive Officer of OncoMed, will provide a corporate update at two upcoming investor conferences.

• Wells Fargo Securities 2018 Healthcare Conference in Boston, MA on September 5, 2018 at 9:40 am Eastern Time
• 20th Annual Rodman & Renshaw Global Investment Conference, sponsored by H.C. Wainwright & Co., LLC in New York, NY on September 6, 2018 at 4:40 pm Eastern Time

To access the live webcasts and subsequent archived recordings of these and other company presentations, please visit OncoMed's website at www.oncomed.com/invest/events.cfm. A replay of each presentation will be available for 30 days following the date of the event.

About OncoMed Pharmaceuticals OncoMed Pharmaceuticals is a clinical-stage biopharmaceutical company focused on discovering and developing novel anti-cancer therapeutics. OncoMed has internally discovered a broad pipeline of investigational drugs intended to address the fundamental biology driving cancer's growth, resistance, recurrence and metastasis. Navicixizumab (anti-DLL4/VEGF bispecific, OMP-305B83), anti-TIGIT (etigilimab), and rosmantuzumab (anti-RSPO3, OMP-131R10) are part of OncoMed's strategic alliance with Celgene Corporation. OncoMed is independently developing GITRL-Fc (OMP-336B11), as well as continuing to pursue new drug discovery research. For further information about OncoMed Pharmaceuticals, please see www.oncomed.com.

Contacts Sylvia Wheeler [e-mail]

Alexandra Santos [e-mail]