Sec Form 4 Filing - Weinrot Daniel J @ System1, Inc. - 2022-01-27

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Weinrot Daniel J 2. Issuer Name and Ticker or Trading Symbol System1, Inc. [ SST] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) General Counsel (Last) (First) (Middle) C/O SYSTEM1, INC., 4235 REDWOOD AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 01/27/2022 (Street) MARINA DEL REY, CA90066 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 01/27/2022 A 38,464 A 38,464 D Class C Common Stock( 2 ) 01/27/2022 A 59,642 A 59,642 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Common Units( 3 ) ( 4 ) 01/27/2022 A 59,642 ( 4 ) ( 4 ) Class A Common Stock 59,642 ( 1 ) 59,642 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Weinrot Daniel J C/O SYSTEM1, INC. 4235 REDWOOD AVENUE MARINA DEL REY, CA90066 General Counsel Signatures By: /s/ Daniel Weinrot 01/31/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )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). ( 2 )In connection with the Business Combination, one share of the Company's Class C common stock was issued for each Class B common unit ("Common Unit") in S1 Holdco, LLC held by the reporting person. Pursuant to the Fifth Amended and Restated Limited Liability Company Operating Agreement of S1 Holdco, LLC, the shares of Class C common stock are forfeited and cancelled, on a one-for-one basis, without consideration, upon the redemption of Common Units for shares of Class A Common Stock, or cash, at the Issuer's election. ( 3 )Represents Common Units, which are redeemable on a one-for-one basis for shares of Class A common stock, or, at the election of the Company, cash equal to a volume weighted average market price of a share of Class A Common Stock. The Common Units were acquired pursuant to a reclassification (exempt under Section 16b-7) and reorganization of the Company in connection with the Business Combination. One share of Class C Common Stock was issued for each Common Unit. See Footnote (2). ( 4 )The Common Units are redeemable on a one-for-one basis for shares of Class A common stock, or, at the election of the Company, cash equal to a volume weighted average market price of a share of Class A common stock. The Common Units have no expiration date. Upon any redemption of Common Units, one share of Class C common stock is automatically forfeited and cancelled for each Common Unit so redeemed.

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