Onyx Pharmaceuticals to Report First Quarter 2013 Financial Results After Market on May 7, 2013

  Onyx Pharmaceuticals, Inc. (NASDAQ: ONXX) today announced that it will report financial results for the first quarter 2013 ended March 31, 2013 after market closes on Tuesday, May 7, 2013. The company will host a webcast and conference call with management to discuss financial results, as well as provide a general business overview, at 5:00 p.m. ET (2:00 p.m. PT).

To access a live audio webcast of the conference call, log onto the company's website at: http://www.onyx.com/investors/event-calendar.

To access the live conference call, dial 847-585-4405 and use the passcode 34676954#. A replay of the call will be available on the Onyx website or by dialing 630-652-3042 and using the passcode 34679654# approximately one hour after the conference call concludes through May 21, 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.