2011 Press Releases

Onyx Pharmaceuticals Announces Second Quarter 2011 Financial Results Teleconference and Webcast

South San Francisco, CA. — Jul. 26, 2011

Onyx Pharmaceuticals, Inc. (Nasdaq: ONXX) today announced that it will host a webcast and teleconference with management to discuss second quarter 2011 financial results, as well as provide a general business overview on Wednesday, August 3, 2011, at 5:00 p.m. Eastern Time (2:00 p.m. Pacific Time). Financial results for the second quarter ended June 30, 2011 will be released earlier that day.

Interested parties may access a live webcast of the presentation on the company’s website at:
http://www.onyx-pharm.com/investors/event-calendar

or by dialing 847-585-4405 and using the passcode 30130102#. A replay of the presentation will be available on the Onyx website or by dialing 630-652-3042 and using the passcode 30130102# approximately one hour after the teleconference concludes. The replay will be available through August 17, 2011.

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 and other serious diseases. 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-pharm.com.