Elizabeth Sestanovich - 15 Jul 2026 Form 4 Insider Report for System1, Inc. (SST)

Reporting relationship: Chief People Officer
Issuer ticker: SST
Reported as of: 15 Jul 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 17 Jul 2026, 18:08:04 UTC
Prior SEC filing: 17 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Daniel Weinrot, Attorney-in-Fact for Elizabeth Sestanovich

Key filing fact

Elizabeth Sestanovich filed Form 4 for System1, Inc. (SST) on 17 Jul 2026.

Key facts

This page summarizes Elizabeth Sestanovich's Form 4 filing for System1, Inc. (SST).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 17 Jul 2026, 18:08.

Change

Previous filing in this sequence was filed on 17 Apr 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001907093 Primary reporting owner

Sestanovich Elizabeth

Relationship: Chief People Officer
Address: 4235 REDWOOD AVE, LOS ANGELES
Signature: /s/ Daniel Weinrot, Attorney-in-Fact for Elizabeth Sestanovich
Signature date: 17 Jul 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

SST transaction

Class A Common Stock

Tax liability

Transaction value
Shares: -7,058
Change %: -12%
Price: $2.60^*
Shares after: 51,890
Date: 15 Jul 2026
Ownership: Direct
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Upon the vesting of 13,870 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 7,058 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

Footnote F2

Includes 28,140 unvested RSUs.