Sec Form 4 Filing - Trasimene Trebia, LP @ System1, Inc. - 2022-03-17

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 Trasimene Trebia, LP 2. Issuer Name and Ticker or Trading Symbol System1, Inc. [ SST] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O 1701 VILLAGE CENTER CIRCLE 3. Date of Earliest Transaction (MM/DD/YY) 03/17/2022 (Street) LAS VEGAS, NV89134 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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, par value $0.0001 per share 03/17/2022 C( 3 ) 833,750 A 4,570,955 D( 1 )( 2 )

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 Class D common stock, par value $0.0001 per share ( 3 ) 03/17/2022 C( 3 ) 833,750 ( 3 ) ( 3 ) Class A common stock, par v alue $0.0001 833,750 ( 3 ) 0 D( 1 )( 2 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Trasimene Trebia, LP C/O 1701 VILLAGE CENTER CIRCLE LAS VEGAS, NV89134 X X Trasimene Trebia, LLC C/O 1701 VILLAGE CENTER CIRCLE LAS VEGAS, NV89134 X X FOLEY WILLIAM P II C/O 1701 VILLAGE CENTER CIRCLE LAS VEGAS, NV89134 X X Signatures /s/ See Exhibit 99.1 03/21/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This form is being filed by each of the following Reporting Persons: Trasimene Trebia, LP ("Trasimene"), Trasimene Trebia, LLC ("Trasimene Trebia"), and William P. Foley, II (collectively, the "Reporting Persons"). William P. Foley, II is the sole member of Trasimene Trebia, which is the sole general partner of Trasimene. Because of the relationships among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests. Each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein, if any. ( 2 )Directly owned by Trasimene. ( 3 )Under the Issuer's Certificate of Incorporation, the Class D common stock (i) was automatically convertible into Class A common stock on a one-for-one basis if the volume-weighted average price of Class A common stock equaled or exceeded $12.50 per share for any 20 trading days within a period of 30 consecutive trading days or there was a "change in control" where the valuation of Class A common stock equaled or exceeded $12.50 per share (the "Class D Conversion Event") and (ii) was to be automatically forfeited to the Issuer for no consideration if a Class D Conversion Event did not occur prior to January 27, 2027. The Class D Conversion Event occurred on March 17, 2022, upon which 833,750 shares of Class D common stock directly held by Trasimene automatically converted into 833,750 shares of Class A common stock.

Remarks: Exhibit 99.1 (Joint Filer Information and Signatures) is hereby incorporated by reference herein.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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