Onyx Pharmaceuticals to Present at Upcoming Investor Conferences

Onyx Pharmaceuticals, Inc. (NASDAQ: ONXX) today announced that it will present at two upcoming investor conferences in June and July.

Goldman Sachs 34th Annual Global Healthcare Conference Onyx will present at the Goldman Sachs 34th Annual Global Healthcare Conference on Wednesday, June 12, 2013 at 10:00 a.m. Pacific Time (1:00 p.m. Eastern Time).

8th Annual JMP Securities Healthcare Conference Onyx will present at the 8th Annual JMP Securities Healthcare Conference on Wednesday, July 10, 2013 at 10:00 a.m. Eastern Time (7:00 a.m. Pacific Time).

To access the live webcasts, log onto the company's website at: http://www.onyx.com/investors/event-calendar

It is recommended that listeners log on 15 minutes early in order to register and download any necessary software. For those unable to participate during the live webcast, a recorded replay of the presentation will be available within 24 hours of the completion of the presentation through the following dates:

• Goldman Sachs 34th Annual Global Healthcare Conference - June 26, 2013
• 8th Annual Securities Healthcare Conference - July 24, 2013

About Onyx Pharmaceuticals, Inc. Based in South San Francisco, California, Onyx Pharmaceuticals, Inc. is a global biopharmaceutical company engaged in the development and commercialization of innovative therapies for improving the lives of people with cancer. The company is focused on developing novel medicines that target key molecular pathways. For more information about Onyx, visit the company's website at www.onyx.com. Onyx Pharmaceuticals is on Twitter. Sign up to follow our Twitter feed @OnyxPharm at http://twitter.com/OnyxPharm.

Contact: Nicole Keith 650-266-2123