X0508 4 2025-10-30 0 0001117297 QUINSTREET, INC QNST 0001207703 SHEEHAN ANDREW T 950 TOWER LANE, 12TH FLOOR FOSTER CITY CA 94404 1 0 0 0 0 Common Stock 2025-10-30 4 A 0 9938 0.0 A 17670 D Common Stock 2025-10-30 4 G 0 7732 0.0 D 9938 D Common Stock 2025-10-30 4 G 0 7732 0.0 A 55218 I by Trust Common Stock 15623 I by Partnership Represents shares of common stock that are issuable pursuant to a Restricted Stock Unit (RSU) award. The vesting commencement date of the RSU award is October 30, 2025 and it vests daily over one year. Shares held by a trust of which the reporting person is a trustee. The reporting person disclaims beneficial ownership in these shares except as to the reporting person's pecuniary interest therein. Shares held by a limited partnership of which the reporting person is the managing director of its general partner. The reporting person disclaims beneficial ownership of these shares except as to the reporting person's pecuniary interest therein. By: Gregory Wong For: Andrew Sheehan 2025-11-03