System1 counsel reports RSU tax share withholding

System1, Inc. reported an insider equity event for General Counsel & Secretary Daniel J. Weinrot.

Accepted by SEC EDGAR 07/17/2026 - 06:07 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

System1, Inc. reported an insider equity event for General Counsel & Secretary Daniel J. Weinrot. Upon vesting of 17,995 restricted stock units (RSUs), the company withheld 9,156 shares of Class A Common Stock at $2.60 per share to satisfy his tax withholding obligation.

After this non-market tax-withholding disposition, Weinrot directly holds 59,897 shares of Class A Common Stock, which includes 36,515 unvested RSUs. No open-market purchase or sale of shares occurred as part of this transaction.

Insider Trade Summary

Tax Withholding: 9,156 shares

Tax Withholding 1 txn

Insider Weinrot Daniel J

Role General Counsel & Secretary

Type	Security	Shares	Price	Value
Tax Withholding	Class A Common Stock F1, F2	9,156	$2.60	$24K

Holdings After Transaction: Class A Common Stock — 59,897 shares (Direct)

Footnotes (2)

1. F1. Upon the vesting of 17,995 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 9,156 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.
2. F2. Includes 36,515 unvested RSUs.

Key Figures

Shares withheld for taxes: 9,156 shares Transaction price per share: $2.60 RSUs vested: 17,995 RSUs +2 more

5 metrics

Shares withheld for taxes 9,156 shares Class A Common Stock withheld to cover tax obligation on RSU vesting

Transaction price per share $2.60 Value used for tax-withholding disposition of 9,156 shares

RSUs vested 17,995 RSUs Restricted stock units that vested for the reporting person

Total shares after transaction 59,897 shares Direct holdings of System1 Class A Common Stock following the withholding

Unvested RSUs included in holdings 36,515 RSUs Unvested restricted stock units counted within post-transaction holdings

Key Terms

restricted stock units ("RSUs"), tax withholding obligation, unvested RSUs

3 terms

restricted stock units ("RSUs") financial

"Upon the vesting of 17,995 restricted stock units ("RSUs") previously granted"

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

tax withholding obligation financial

"shares to cover the reporting person's tax withholding obligation with respect"

unvested RSUs financial

"Includes 36,515 unvested RSUs."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did System1 (SST) General Counsel Daniel J. Weinrot report?

Daniel J. Weinrot had 17,995 RSUs vest, and 9,156 shares of System1 Class A stock were withheld to cover related taxes. This non-market withholding adjusted his equity position without any open-market purchase or sale of SST shares.

How many System1 (SST) shares were withheld for Daniel J. Weinrot’s taxes?

System1 withheld 9,156 shares of Class A Common Stock for Daniel J. Weinrot’s tax obligations tied to RSU vesting. These shares came from a 17,995-unit RSU vesting event and were retained by the company rather than sold in the market.

How many restricted stock units vested and remain unvested for System1 (SST) insider Daniel J. Weinrot?

A block of 17,995 RSUs vested for Daniel J. Weinrot in this event. After the transaction, his reported holdings include 36,515 unvested RSUs, which are part of his total direct ownership in System1 equity.

What is Daniel J. Weinrot’s System1 (SST) shareholding after the reported transaction?

Following the tax-withholding disposition, Daniel J. Weinrot directly holds 59,897 shares of System1 Class A Common Stock. This total explicitly includes 36,515 unvested RSUs, reflecting both vested common shares and remaining unvested stock units.

Was the System1 (SST) insider activity for Daniel J. Weinrot an open-market sale?

No, the activity was a tax-withholding disposition, not an open-market sale. System1 withheld 9,156 shares upon RSU vesting to satisfy Daniel J. Weinrot’s tax obligation, with no separate market trade reported in this event.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Weinrot Daniel J

(Last) (First) (Middle)

4235 REDWOOD AVE

(Street)

LOS ANGELES CALIFORNIA 90066

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
System1, Inc. [ SST ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	General Counsel & Secretary

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/15/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	07/15/2026		F		9,156(1)	D	$2.6	59,897(2)	D

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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

Explanation of Responses:

1. Upon the vesting of 17,995 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 9,156 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

2. Includes 36,515 unvested RSUs.

Remarks:

	/s/ Daniel J Weinrot	07/17/2026
	** Signature of Reporting Person	Date
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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)