STOCKHOLDER INFORMATION

Corporate Headquarters

Maxygen, Inc.
515 Galveston Drive
Redwood City, CA 94063
(650) 298-5300

Transfer Agent

Computershare Trust Company, N.A.
P.O. Box 43078
Providence, RI 02940-3078
(781) 575-2879
(800) 952-9245 Hearing Impaired
www.computershare.com

Courier/Registered Mail:
Computershare Trust Company, N.A.
250 Royall Street
Canton, MA 02021

Common Stock

Maxygen, Inc. common stock is listed on the Nasdaq Global Market under the symbol MAXY

Independent Registered Public Accountants

Ernst & Young LLP
Palo Alto, CA

Investor Relations Contact

Michele Boudreau
Director, Investor and Public Relations
Maxygen, Inc.
515 Galveston Drive
Redwood City, CA 94063
(650) 298-5853

For additional information regarding Maxygen, including access to press releases, financial information, SEC filings, webcasts and stock quotes, please visit our website at www.maxygen.com.