AFFX Affymetrix, Inc.

Affymetrix to Host Conference Call on July 21, 2004 to Announce Second Quarter 2004 Results SANTA CLARA, Calif., July 14 /PRNewswire-FirstCall/ -- Affymetrix, Inc. (NASDAQ:AFFX) today announced that it will release results for the second quarter of 2004 after close of the stock market on Wednesday, July 21, 2004. Company management will host a conference call at 2:00 p.m. PT on July 21 to discuss second quarter 2004 results and provide financial guidance for the third quarter and fiscal year 2004. The dial-in number for domestic callers will be 888-737-3798 and for international callers will be 706-643-2578. A live webcast of the conference call can be accessed by visiting Affymetrix' internet website at http://www.affymetrix.com/ under the "Investors" tab. A telephonic replay of the conference call will be available until 5:00 p.m. PT on July 28, 2004. The replay number for domestic callers will be 800-642-1687 and for international callers will be 706-645-9291, passcode 8350582#. An archived webcast of the conference call will be available under the "Investors" section of the company's website at http://www.affymetrix.com/. The conference call, replay and webcast are open to all interested parties. About Affymetrix: Affymetrix is a pioneer in creating breakthrough tools that are driving the genomic revolution. By applying the principles of semiconductor technology to the life sciences, Affymetrix develops and commercializes systems that enable scientists to improve the quality of life. The Company's customers include pharmaceutical, biotechnology, agrichemical, diagnostics and consumer products companies as well as academic, government and other non-profit research institutes. Affymetrix offers an expanding portfolio of integrated products and services, including its integrated GeneChip(R) brand platform, to address growing markets focused on understanding the relationship between genes and human health. Additional information on Affymetrix can be found at http://www.affymetrix.com/. DATASOURCE: Affymetrix CONTACT: Doug Farrell, Vice President of Investor Relations, Affymetrix, +1-408-731-5285 Web site: http://www.affymetrix.com/

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