QUINSTREET, INC

This proxy statement is furnished to you by the Board of Directors of QuinStreet, Inc. (the “Board” or “Board of Directors”) and contains information related to the 2025 annual meeting of our stockholders to be held on October 30, 2025, beginning at 3:00 P.M., local time, at Metro Tower, 950 Tower Lane, Suite 1200, Foster City, California 94404, and at any postponements or adjournments thereof. This proxy is solicited by our Board.

In accordance with the SEC’s “Notice and Access” rules, we may provide proxy materials, including this proxy statement and our annual report, to our stockholders by providing access to such documents on the Internet instead of mailing printed copies. Stockholders will not receive printed copies of the proxy materials unless they request them or have previously elected to receive printed copies of all future proxy materials. Instead, we will mail on or about September 16, 2025 to most of our stockholders a Notice of Internet Availability of Proxy Materials (the “Notice”) containing instructions on how to access our proxy statement and our annual report, and vote electronically via the Internet. The Notice will also contain instructions on how to receive a printed copy of your proxy materials, including a proxy card (or voting instruction form, as applicable). Stockholders who do not receive the Notice will receive a copy of the proxy materials by mail or electronic mail.

References in this proxy statement to “we,” “us,” “our,” “the Company” and “QuinStreet” refer to QuinStreet, Inc.