Affymetrix, Inc. (Nasdaq:AFFX) today announced that it will release operating results for the third quarter of 2009 after close of the stock market on Wednesday, October 21, 2009.

Affymetrix' management team will host a conference call on October 21, 2009 at 2:00 P.M. PT to review its operating results for the third quarter of 2009. A live webcast can be accessed by visiting the Investor Relations section of the company’s website at www.affymetrix.com. In addition, investors and other interested parties can listen by dialing domestic: (866) 500-AFFX, international: (706) 643-2771.

A replay of this call will be available from 5:00 P.M. PT on October 21, 2009 until 8:00 P.M. PT on October 28, 2009 at the following numbers: (800) 642-1687 (domestic), (706) 645-9291 (international). The conference number for both replays is 34032730. An archived webcast of the conference call will be available under the Investor Relations section of the company's website at www.affymetrix.com.

About Affymetrix

Affymetrix technology is used by the world’s top pharmaceutical, diagnostic and biotechnology companies, as well as leading academic, government and not-for-profit research institutes. More than 1,800 systems have been shipped around the world and more than 18,000 peer-reviewed papers have been published using the technology.

Affymetrix is headquartered in Santa Clara, Calif., and has manufacturing facilities in Cleveland, Ohio, and Singapore. The company has about 1,100 employees worldwide and maintains sales and distribution operations across Europe and Asia. For more information about Affymetrix, please visit the company’s website at www.affymetrix.com.