Onyx Pharmaceuticals to Host Analyst Day March 14, 2013

South San Francisco, CA. Feb. 27, 2013

Onyx Pharmaceuticals, Inc. (Nasdaq: ONXX) will host an Analyst Day on Thursday, March 14, 2013, from 8:30 a.m. to 11:30 a.m. ET (5:30 a.m. to 8:30 a.m. PT).

During this meeting, members of the Onyx leadership team will review commercial and development progress and physician experts will share their perspectives.

To access a live audio webcast of the event, log onto the company’s website at:
http://www.onyx.com/investors/event-calendar. A reply will be available until March 28, 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.