QuinStreet Files Registration Statement for Proposed Initial Public Offering

Foster City, CA -- November 19, 2009 – QuinStreet, Inc., a leader in vertical marketing and media on the Internet, announced today that it has filed a registration statement on Form S-1 with the U.S. Securities and Exchange Commission (SEC) relating to a proposed initial public offering of shares of its common stock. It is expected that all shares of the common stock to be sold in the offering will be offered by the company. The number of shares to be offered and the price range for the offering have not yet been determined.

Credit Suisse Securities (USA) LLC, BofA Merrill Lynch and J.P. Morgan Securities Inc. are acting as joint book-running managers and underwriters for the offering. Qatalyst Partners LP is acting as financial advisor to QuinStreet in connection with the proposed offering.

The offering will be made only by means of a prospectus. When available, copies of the preliminary prospectus relating to the offering may be obtained from Credit Suisse Securities (USA) LLC, Prospectus Department, One Madison Avenue, 1B, New York, NY 10010, Phone: (800) 221-1037; BofA Merrill Lynch, 4 World Financial Center, New York, NY 10080, Attn: Preliminary Prospectus Department or email Prospectus.Requests at ml dot com; or J.P. Morgan Securities Inc., Attention: Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, New York 11717, or by telephone at (866) 803-9204.

A registration statement relating to these securities has been filed with the SEC, but has not yet become effective. These securities may not be sold nor may offers to buy be accepted prior to the time the registration statement becomes effective.

Source: QuinStreet