Elizabeth Sestanovich - Jul 28, 2025 Form 4 Insider Report for System1, Inc. (SST)

Role
Chief People Officer
Signature
/s/ Daniel Weinrot, Attorney-in-Fact for Elizabeth Sestanovich
Stock symbol
SST
Transactions as of
Jul 28, 2025
Transactions value $
-$1,014
Form type
4
Date filed
7/30/2025, 07:39 PM
Previous filing
Jul 17, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Sestanovich Elizabeth Chief People Officer 4235 REDWOOD AVE, LOS ANGELES /s/ Daniel Weinrot, Attorney-in-Fact for Elizabeth Sestanovich 2025-07-30 0001907093

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction SST Class A Common Stock Tax liability -$1.01K -135 -0.66% $7.51 20.3K Jul 28, 2025 Direct F1, F2
transaction SST Class A Common Stock Award $0 +40K +196.88% $0.00 60.3K Jul 29, 2025 Direct F3, F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Upon the vesting of 375 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 135 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.
F2 Includes 4,770 unvested RSUs.
F3 The Reporting Person was granted 40,000 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 Ms. Sestanovich 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 Includes 44,770 unvested RSUs.