System1, Inc. — Director's Dealing 2025

Oct 17, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: System1, Inc. (SST)
CIK: 0001805833
Period of Report: 2025-10-15

Reporting Person: Sestanovich Elizabeth (Chief People Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-10-15	Class A Common Stock	F	282	$7.94	Disposed	60035	Direct

Footnotes

F1: Upon the vesting of 670 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 282 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

F2: Includes 44,100 unvested RSUs.