X0306 4/A 2022-01-27 2022-02-02 0 0001805833 System1, Inc. SST 0001906862 Kidambi Tridivesh C/O SYSTEM1, INC. 4235 REDWOOD AVENUE MARINA DEL REY CA 90066 0 1 0 0 Chief Financial Officer Class A Common Stock 2022-01-27 4 A 0 15518 A 15518 I By Spouse Received in connection with the business combination (the "Business Combination") among System1, Inc. (f/k/a Trebia Acquisition Corp., the "Company"), S1 Holdco, LLC ("S1 Holdco"), Orchid Merger Sub I, Inc. ("Merger Sub I"), Orchid Merger Sub II, LLC ("Merger Sub II" and, together with Merger Sub I, the "Merger Subs"), System1 SS Protect Holdings, Inc. ("Protected") and the other parties signatory to that certain Business Combination Agreement, dated as of June 28, 2021 (as amended on November 30, 2021, January 10, 2022 and January 25, 2022). The Form 4/A amends the Form 4 filed on February 2, 2022, to include 15,518 shares of Class A common stock acquired by the spouse of the reporting person, who is an employee of the Company, in connection with the Business Combination. Only the missing transaction has been reported in this amendment. By: /s/ Daniel Weinrot, Attorney-in-Fact for Tridivesh Kidambi 2022-03-07