Sec Form 4 Filing - Just Develop It Ltd @ System1, Inc. - 2022-01-28

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 Just Develop It Ltd 2. Issuer Name and Ticker or Trading Symbol System1, Inc. [ SST] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) LARCH HOUSE PARKLANDS, BUSINESS PARK 3. Date of Earliest Transaction (MM/DD/YY) 01/28/2022 (Street) DENMEAD, HAMPSHIRE, X0PO7 6XP 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( 1 )( 2 ) 01/28/2022 A 725,000 A 725,000 D( 3 )

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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Just Develop It Ltd LARCH HOUSE PARKLANDS BUSINESS PARK DENMEAD, HAMPSHIRE, X0PO7 6XP X Signatures By: /s/ Daniel Weinrot, Attorney-in-Fact for Just Develop It Limited 03/07/2022 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 )The shares are represented by restricted stock units ("RSUs") granted to the reporting person in connection with the Business Combination and which vest upon the occurrence of: (a) the first trading day on which the volume weighted average price of the Company's Class A common stock equals or exceeds $12.50 per share for any 20 trading days within a period of 30 consecutive trading days or (b) a Change of Control (as defined in the Business Combination Agreement), in which the valuation of the Company's Class A common stock is equal to or in excess of $12.50 per share, for the five-year period following the closing of the Business Combination. ( 3 )JDIL's controlling stockholder is Christopher Phillips, a director of the Company and Mr. Phillips is a director of JDIL. Mr. Phillips has voting and dispositive power over the securities held by JDIL and may be deemd to beneficially own the shares held by JDIL, but disclaims such beneficial ownership except to any pecuniary interest therein. Mr. Phillips has filed separate Section 16 forms regarding his deemed beneficial ownership of these shares

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