Alpha and Omega Semiconductor Prices Initial Public Offering

April 28, 2010
AOSL

Deutsche Bank Securities Inc. and Piper Jaffray & Co. are acting as joint book-running managers for the offering. Thomas Weisel Partners LLC and Caris & Company, Inc. are acting as co-managers.

A registration statement relating to the offering was declared effective by the Securities and Exchange Commission on April 28, 2010.  The offering is being made solely by means of a prospectus forming part of the effective registration statement, copies of which may be obtained, when available, from: Deutsche Bank Securities Inc., Attention: Prospectus Department, 100 Plaza One, Jersey City, New Jersey 07311, telephone: (800) 503-4611; or email at prospectusrequest@list.db.com; or by contacting Piper Jaffray & Co., 800 Nicollet Mall, Suite 800, Minneapolis, MN 55402, Attention: Prospectus Department, telephone: 1-800-754-4781; or email at prospectus@pjc.com.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Alpha and Omega Semiconductor

Alpha and Omega Semiconductor Limited, or AOS, is a designer, developer and global supplier of a broad range of power semiconductors, including a wide portfolio of Power MOSFET and Power IC products. AOS seeks to differentiate itself by integrating its expertise in device physics, process technology, design and advanced packaging to optimize product performance and cost, and its product portfolio is designed to meet the ever increasing power efficiency requirements in high volume applications, including portable computers, flat panel TVs, battery packs, portable media players and power supplies.

CONTACT:  Alpha and Omega Semiconductor Limited
          Ephraim Kwok, Chief Financial Officer
          investors@aosmd.com