Kidambi Tridivesh

SEC source: 0001628280-26-048713 · wk-form4_1784326042.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 175,793

F1 · shares: Upon the vesting of 17,338 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 6,022 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 35,176 unvested RSUs.

SEC source: 0001628280-26-039992 · wk-form4_1780439387.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 181,815

F1 · shares: Mr. Kidambi was granted 35,300 restricted stock units ("RSUs"), which was fully vested on the date of grant. Each RSU represents the right to receive one share of SST Class A Common Stock upon vesting.

F2 · balance_after: Includes 52,514 unvested RSUs.

SEC source: 0001628280-26-025911 · wk-form4_1776472413.xml · nonDerivative · entry 2

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 146,515

F3 · shares: Upon the vesting of 838 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 301 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F4 · balance_after: Includes 52,514 unvested RSUs.

SEC source: 0001628280-26-025911 · wk-form4_1776472413.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 146,816

F1 · shares: The Reporting Person purchased 26,910 shares in a privately negotiated arm's length transaction from another existing holder of the Issuer's Class A common stock in a transaction that was not conducted through the exchange on which the Issuer's securities are listed.

F2 · balance_after: Includes 53,352 unvested RSUs.

SEC source: 0001628280-26-004229 · wk-form4_1769732683.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 119,906

F1 · shares: Upon the vesting of 625 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 258 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 53,352 unvested RSUs.

SEC source: 0001628280-26-002464 · wk-form4_1768606211.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 120,164

F1 · shares: Upon the vesting of 837 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 345 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 53,977 unvested RSUs.

SEC source: 0001628280-25-047630 · wk-form4_1761862624.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 120,509

F1 · shares: Upon the vesting of 625 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 263 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 54,814 unvested RSUs.

SEC source: 0001628280-25-045432 · wk-form4_1760742579.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 120,772

F1 · shares: Upon the vesting of 837 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 352 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 55,439 unvested RSUs.

SEC source: 0001906862-25-000015 · wk-form4_1753918890.xml · derivative · entry 3

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,000

Underlying: Class A Common Stock · 20,000 shares

Expires 2032-07-29

F5 · security: These stock appreciation rights (the "SARs") were granted to the Reporting Person pursuant to the System1, Inc. 2024 Stock Appreciation Rights Plan, as amended (the "Plan") and a corresponding Stock Appreciation Rights Grant Notice and Award Agreement between System1, Inc. (the "Issuer") and the Reporting Person. The SARs reported on this Form 4 represent the right to receive (at the Issuer's discretion), upon exercise of the SARs by the Reporting Person, a payment in either (x) Class A Common Stock, par value $0.0001 per share ("Class A Common Stock") or (y) cash, in the amount equal to the number of shares of Class A Common Stock underlying the number of SARs being exercised multiplied by the excess of the fair market value of one share of Class A Common Stock on (i) the date the SARs are exercised, and (ii) $7.09, the Issuer's closing price on July 29, 2025 (the date the SARs were granted, the "Grant Date").

F6 · derivative.exercise_date: These Stock Appreciation Rights (the "SARs") were granted to the Reporting Person on July 29, 2025 under the System1, Inc. 2024 Stock Appreciation Rights Plan, as amended (the "Plan") and vest (i) 25% (or 5,000 SARs) upon the Issuer first achieving trailing twelve month Adjusted EBITDA ("TTM Adjusted EBITDA") of $50.0 million after the date of grant, (ii) 25% (or 5,000 SARs) upon the Issuer first achieving TTM Adjusted EBITDA of $55.0 million after the date of grant, (iii) 25% (or 5,000 SARs) upon the Issuer first achieving TTM Adjusted EBITDA of $60.0 million after the date of grant and (iv) 25% (or 5,000 SARs) upon the Issuer first achieving TTM Adjusted EBITDA of $65.0 million after the date of grant, in each case, subject to the terms of the Plan and an award agreement entered into between the Reporting Person and the Issuer pursuant to the Plan.

F7 · balance_after: Represents the total number of SARs held by the Reporting Person after the Issuer's completion of a 1-for-10 reverse stock split that occurred on June 11, 2025.

SEC source: 0001906862-25-000015 · wk-form4_1753918890.xml · nonDerivative · entry 2

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 121,124

F3 · shares: The Reporting Person was granted 50,000 restricted stock units ("RSUs") in connection with his continued employment with System1, Inc. ("SST"). Each RSU represents the right to receive one share of SST Class A Common Stock upon vesting. Subject to the continued employment of Mr. Kidambi through the applicable vesting date, one-third of the RSUs will vest on July 15, 2026, and the remaining two-thirds will vest in 8 substantially equal quarterly installments on each quarterly anniversary thereafter.

F4 · balance_after: Includes 56,276 unvested RSUs.

SEC source: 0001906862-25-000015 · wk-form4_1753918890.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 71,124

F1 · shares: Upon the vesting of 625 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 224 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 6,276 unvested RSUs.

SEC source: 0001906862-25-000013 · wk-form4_1752798691.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 71,348

F1 · shares: Upon the vesting of 837 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 300 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Represents the total number of shares held after the Issuer's completion of a 1-for-10 reverse stock split that occurred on June 11, 2025.

F3 · balance_after: Includes 6,901 unvested RSUs.

SEC source: 0001906862-25-000011 · wk-form4_1749684457.xml · derivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 15,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Each whole warrant entitles the holder thereof to purchase one share of Class A common stock of at an exercise price of $11.50 per share. The warrants are currently exercisable . The warrants will expire five years after the completion of the Company's Business Combination (which was consummated on January 27, 2022) or earlier upon redemption or liquidation, as described under the heading "Description of System1 Securities-System1 Warrants" in the Company's registration statement on Form S-4 (File No. 333-260714).

F2 · shares: The Reporting Person sold 15,000 public warrants held by the Reporting Person at a price of $0.004 per exercisable warrant.

F1 · derivative.exercise_date: Each whole warrant entitles the holder thereof to purchase one share of Class A common stock of at an exercise price of $11.50 per share. The warrants are currently exercisable . The warrants will expire five years after the completion of the Company's Business Combination (which was consummated on January 27, 2022) or earlier upon redemption or liquidation, as described under the heading "Description of System1 Securities-System1 Warrants" in the Company's registration statement on Form S-4 (File No. 333-260714).

F1 · derivative.expiration_date: Each whole warrant entitles the holder thereof to purchase one share of Class A common stock of at an exercise price of $11.50 per share. The warrants are currently exercisable . The warrants will expire five years after the completion of the Company's Business Combination (which was consummated on January 27, 2022) or earlier upon redemption or liquidation, as described under the heading "Description of System1 Securities-System1 Warrants" in the Company's registration statement on Form S-4 (File No. 333-260714).

SEC source: 0001906862-25-000009 · wk-form4_1746048879.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 716,488

F1 · shares: Upon the vesting of 6,250 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 2,237 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 77,375 unvested RSUs.

SEC source: 0001906862-25-000006 · wk-form4_1744929355.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 718,725

F1 · shares: Upon the vesting of 8,375 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 2,997 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 83,625 unvested RSUs.

SEC source: 0001906862-25-000004 · wk-form4_1738283317.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 721,722

F1 · shares: Upon the vesting of 6,250 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 2,568 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 92,000 unvested RSUs.

SEC source: 0001906862-25-000002 · wk-form4_1737158452.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 724,290

F1 · shares: Upon the vesting of 33,000 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 13,557 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 98,250 unvested RSUs.

SEC source: 0001906862-24-000011 · wk-form4_1730424216.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 737,847

F1 · shares: Upon the vesting of 6,250 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 2,330 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 131,250 unvested RSUs.

SEC source: 0001906862-24-000009 · wk-form4_1722472567.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 740,077

F1 · shares: Upon the vesting of 6,250 restricted stock units ("RSUs") previously granted to the Reporting Person, the Company withheld 2,231 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 137,500 unvested RSUs.

SEC source: 0001906862-24-000006 · wk-form4_1721694793.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 742,308

F1 · shares: The Reporting Person was granted 100,000 restricted stock units ("RSUs") in connection with his continued employment with System1, Inc. ("SST"). Each RSU represents the right to receive one share of SST Class A Common Stock upon vesting. Subject to the continued employment of the Reporting Person through the applicable vesting date, one-third of the RSUs will vest on January 15, 2025, and the remaining two-thirds will vest in 8 substantially equal quarterly installments on each quarterly anniversary thereafter.

F2 · balance_after: The amount of securities beneficially owned following the reported transaction has been updated to correct a previous overstatement of such beneficially owned shares by 34,604 shares of Class A Common Stock, and the amount of beneficially owned shares following the reported transaction has been reduced accordingly.

F3 · balance_after: Includes 143,750 unvested RSUs.

SEC source: 0001628280-24-031213 · wk-form4_1720055144.xml · derivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 700,000

Underlying: Class A Common Stock · 700,000 shares

Expires 2031-07-01

F1 · security: These stock appreciation rights (these "SARs") were granted to the Reporting Person pursuant to the System1, Inc. 2024 Stock Appreciation Rights Plan, as amended (the "Plan") and a corresponding Stock Appreciation Rights Grant Notice and Award Agreement between System1, Inc. (the "Issuer") and the Reporting Person. The SARs reported on this Form 4 represent the right to receive (at the Issuer's discretion), upon exercise of the SARs by the Reporting Person, a payment in either (x) Class A Common Stock, par value $0.0001 per share ("Class A Common Stock") or (y) cash, in the amount equal to the number of shares of Class A Common Stock underlying the number of SARs being exercised multiplied by the excess of the fair market value of one share of Class A Common Stock on (i) the date the SARs are exercised, and (ii) $1.44, the Issuer's closing price on July 1, 2024 (the date the SARs were granted, the "Grant Date").

F2 · derivative.exercise_date: These Stock Appreciation Rights ("SARs") were granted to the Reporting Person on July 1, 2024 under the System1, Inc. 2024 Stock Appreciation Rights Plan, as amended (the "Plan") and vest (i) 25% upon the Issuer first achieving trailing twelve month Adjusted EBITDA ("TTM Adjusted EBITDA") of $50.0 million after the date of grant, (ii) 25% upon the Issuer first achieving TTM Adjusted EBITDA of $60.0 million after the date of grant, (iii) 25% upon the Issuer first achieving TTM Adjusted EBITDA of $70.0 million after the date of grant and (iv) 25% upon the Issuer first achieving TTM Adjusted EBITDA of $80.0 million after the date of grant, in each case, subject to the terms of the Plan and an award agreement entered into between the Reporting Person and the Issuer pursuant to the Plan.

SEC source: 0001906862-24-000004 · wk-form4_1714523497.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 676,912

F1 · shares: Upon the vesting of 6,250 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 2,230 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 43,750 unvested RSUs.

SEC source: 0001906862-24-000002 · wk-form4_1706660977.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 679,142

F1 · shares: Upon the vesting of 61,250 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 22,471 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 50,000 unvested RSUs.

SEC source: 0001906862-23-000011 · wk-form4_1698792391.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 701,613

F1 · shares: Upon the vesting of 11,250 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 3,891 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 111,250 unvested RSUs.

SEC source: 0001628280-23-026875 · wf-form4_169101510678094.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 705,504

F1 · shares: Mr. Kidambi was granted 50,000 restricted stock units ("RSUs") in connection with his continued employment with System1, Inc. ("SST"). Each RSU represents the right to receive one share of SST Class A Common Stock upon vesting. Subject to the continued employment of Mr. Kidambi through the applicable vesting date, all 50,000 of the RSUs will vest in full on January 27, 2024.

F2 · balance_after: Includes 122,500 unvested RSUs.

SEC source: 0001906862-23-000009 · wf-form4_169093817761353.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 655,504

F1 · shares: Upon the vesting of 11,250 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 3,891 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 72,500 unvested RSUs.

F3 · balance_after: Includes 4,180 shares received in connection with pro-rata distributions from OpenMail2, LLC to its members, for no consideration and in an exempt transaction under Rule 16a-9, since the Reporting Person's last reportable transaction filed on Form 4.

SEC source: 0001906862-23-000007 · wf-form4_168305893953608.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 655,215

F1 · shares: Upon the vesting of 11,250 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 3,862 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 8,360 shares received in connection with pro-rata distributions from OpenMail2, LLC to its members, for no consideration and in an exempt transaction under Rule 16a-9, since the Reporting Person's last reportable transaction filed on Form 4.

F3 · balance_after: Includes 83,750 unvested RSUs.

SEC source: 0001906862-23-000004 · wf-form4_167519922098330.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 650,717

F1 · shares: Upon the vesting of 5,000 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 2,085 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 95,000 unvested RSUs.

SEC source: 0001906862-23-000002 · wf-form4_167408857181908.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 652,802

F1 · shares: Upon the vesting of 3,648 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 1,510 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 100,000 unvested RSUs.

SEC source: 0001906862-22-000008 · wf-form4_166864598412332.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 654,312

F1 · price: The price reported in Column 4 is a weighted average price. The shares were purchased in more than one transaction at prices ranging from $4.20 to $4.50, inclusive. The Reporting Person(s) undertake(s) to provide to the Issuer, any security holder, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

F2 · balance_after: Includes 4,180 shares received in connection with pro-rata distributions from OpenMail2, LLC to its member, for no consideration and in an exempt transaction under Rule 16a-9, since the Reporting Person's last reportable transaction filed on Form 4.

SEC source: 0001906862-22-000006 · wf-form4_166605556982163.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 634,190

F1 · shares: Upon the vesting of 3,684 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 1,274 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes 103,684 unvested RSUs.

SEC source: 0001906862-22-000004 · wf-form4_166069378317462.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 635,464

F1 · kind: Upon the vesting of 9,210 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 3,185 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2 · balance_after: Includes shares received in connection with pro-rata distributions from OpenMail2, LLC to its member, for no consideration and in an exempt transaction under Rule 16a-9. The Form 4s filed on May 12, 2022 and June 22, 2022 by the reporting person did not previously include in Column 5 an aggregate of 4,180 and 15,883 shares, respectively, then held by the reporting person from prior exempt pro-rata distributions from OpenMail2, LLC under Rule 16a-9.

F3 · balance_after: Includes 107,368 unvested RSUs.

SEC source: 0001906862-22-000002 · wf-form4_165593772461653.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 614,407

F1 · price: Mr. Kidambi was granted 16,578 restricted stock units ("RSUs") in connection with the replacement of previously unvested Value Creation Units of the Issuer's predecessor entity (the "Original VCUs") outstanding as of the closing of the Issuer's business combination transaction (the "Replacement RSUs"), of which 5,526 of the Replacement RSUs were deemed vested as of the grant date. Each Replacement RSU represents the right to receive one (1) share of SST Class A Common Stock upon vesting. Subject to the continued employment of Mr. Kidambi through the applicable vesting dates, the Replacement RSUs vest in quarterly installments over the course of the Original VCU remaining vesting schedule(s).

F2 · balance_after: Includes 111,052 unvested RSUs.

SEC source: 0000899243-22-017938 · doc4.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 597,829

F1 · price: Mr. Kidambi was granted 100,000 restricted stock units ("RSUs") in connection with his continued employment with System1, Inc. ("SST"). Each RSU represents the right to receive one share of SST Class A Common Stock upon vesting. Subject to the continued employment of Mr. Kidambi through the applicable vesting dates, (i) 5,000 of the RSUs will vest on January 28, 2023, (ii) 15,000 of the RSUs will vest in quarterly installments of 3,750 each on January 28, April 28, July 28 and October 28, 2024 and (iii) the remaining 80,000 RSUs will vest in eight (8) quarterly installments of 10,000 each on the quarterly anniversary thereafter.

SEC source: 0000899243-22-015533 · doc4.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 497,829

F1 · kind: On April 20, 2022 the reporting person received these shares in a pro rata distribution from Lone Investment Holdings, of which the reporting person is a non-managing member, for no consideration, in an exempt transaction under Rule 16a-9.

F1 · price: On April 20, 2022 the reporting person received these shares in a pro rata distribution from Lone Investment Holdings, of which the reporting person is a non-managing member, for no consideration, in an exempt transaction under Rule 16a-9.

SEC source: 0000899243-22-004249 · doc4.xml · derivative · entry 3

Kidambi Tridivesh · CIK 0001906862 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 436,093

Underlying: Class A Common Stock · 436,093 shares

Expires not disclosed

F3 · security: Represents Common Units of S1 Holdco, which are redeemable (in connection with the surrender and forfeiture of the corresponding shares of Class C common stock (See Footnote 2 above)) on a one-for-one basis for shares of the Company's Class A common stock, or, at the election of the Company, cash equal to the volume weighted average market price of a share of Class A Common Stock at the time of such redemption. 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. Upon the closing of the Business Combination, the reporting person was issued one share of Class C Common Stock for each Common Unit held by the reporting person as of the closing. See Footnote 2 above.

F4 · derivative.exercise_price: The Common Units are redeemable (in connection with the surrender and forfeiture of the corresponding shares of Class C common stock (See Footnote 2 above)) on a one-for-one basis for shares of the Company's Class A Common Stock, or, at the election of the Company, cash equal to the volume weighted average market price of a share of Class A Common Stock at the time of such redemption. The Common Units have no expiration date. Upon any redemption of Common Units, the corresponding share of Class C common stock held by the reporting person is automatically forfeited and cancelled at the time of such redemption of the Common Unit.

F1 · price: 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).

F4 · derivative.exercise_date: The Common Units are redeemable (in connection with the surrender and forfeiture of the corresponding shares of Class C common stock (See Footnote 2 above)) on a one-for-one basis for shares of the Company's Class A Common Stock, or, at the election of the Company, cash equal to the volume weighted average market price of a share of Class A Common Stock at the time of such redemption. The Common Units have no expiration date. Upon any redemption of Common Units, the corresponding share of Class C common stock held by the reporting person is automatically forfeited and cancelled at the time of such redemption of the Common Unit.

F4 · derivative.expiration_date: The Common Units are redeemable (in connection with the surrender and forfeiture of the corresponding shares of Class C common stock (See Footnote 2 above)) on a one-for-one basis for shares of the Company's Class A Common Stock, or, at the election of the Company, cash equal to the volume weighted average market price of a share of Class A Common Stock at the time of such redemption. The Common Units have no expiration date. Upon any redemption of Common Units, the corresponding share of Class C common stock held by the reporting person is automatically forfeited and cancelled at the time of such redemption of the Common Unit.

SEC source: 0000899243-22-004249 · doc4.xml · nonDerivative · entry 2

Kidambi Tridivesh · CIK 0001906862 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 436,093

F2 · security: In connection with the Business Combination, one share of the Company's Class C common stock was issued for each Class B Unit ("Common Unit") in S1 Holdco, LLC ("S1 Holdco") held by the reporting person as of the closing of the Business Combination. Pursuant to the Fifth Amended and Restated Limited Liability Company Operating Agreement of S1 Holdco, in connection with the redemption of the Common Units (at the election of the holder), the corresponding shares of Class C common stock in the Company held by the reporting person are forfeited and cancelled, on a one-for-one basis, without consideration, for either shares of Class A Common Stock, or cash, at the Issuer's election.

F1 · price: 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).

SEC source: 0000899243-22-004249 · doc4.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 401,489

F1 · price: 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).

SEC source: 0000899243-22-009798 · doc4a.xml · nonDerivative · entry 1

Kidambi Tridivesh · CIK 0001906862 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By Spouse

Disclosed balance after: 15,518

F1 · price: 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).