Onyx Pharmaceuticals, Inc. to Present at Upcoming Investor Conferences

SOUTH SAN FRANCISCO, CA--(Marketwired - May 08, 2013) - Onyx Pharmaceuticals, Inc. (NASDAQ: ONXX) today announced that it will present at two upcoming investor conferences in May.

Bank of America Merrill Lynch 2013 Health Care Conference
Onyx will present at the Bank of America Merrill Lynch 2013 Health Care Conference on Tuesday, May 14, 2013 at 9:20 a.m. Pacific Time (12:20 p.m. Eastern Time).

2013 UBS Global Healthcare Conference
Onyx will present at the 2013 UBS Global Healthcare Conference on Tuesday, May 21, 2013 at 10:30 a.m. Eastern Time (7:30 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:

• Bank of America Merrill Lynch 2013 Health Care Conference - May 28, 2013
• 2013 UBS Global Healthcare Conference - June 4, 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.