System1 executive reports RSU tax withholding

System1, Inc. executive Brian Coppola, Chief Ad Operations Officer, reported a tax-withholding disposition of 6,124 shares of Class A Common Stock at $2.60 per share.

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

Rhea-AI Filing Summary

System1, Inc. executive Brian Coppola, Chief Ad Operations Officer, reported a tax-withholding disposition of 6,124 shares of Class A Common Stock at $2.60 per share. The shares were withheld upon the vesting of 13,954 RSUs. After this event, he holds 59,774 shares directly, including 28,308 unvested RSUs.

Insider Trade Summary

Tax Withholding: 6,124 shares

Tax Withholding 1 txn

Insider Coppola Brian

Role Chief Ad Operations Officer

Type	Security	Shares	Price	Value
Tax Withholding	Class A Common Stock F1, F2	6,124	$2.60	$16K

Holdings After Transaction: Class A Common Stock — 59,774 shares (Direct)

Footnotes (2)

1. F1. Upon the vesting of 13,954 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 6,124 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.
2. F2. Includes 28,308 unvested RSUs.

Key Figures

Shares Withheld for Taxes: 6,124 shares Withholding Price Per Share: $2.6000 per share Post-Transaction Holdings: 59,774 shares +2 more

5 metrics

Shares Withheld for Taxes 6,124 shares Shares of Class A Common Stock withheld to cover tax obligations on RSU vesting

Withholding Price Per Share $2.6000 per share Value per share assigned to the 6,124 withheld shares

Post-Transaction Holdings 59,774 shares Class A Common Stock directly owned by Brian Coppola after the transaction

RSUs Vested 13,954 RSUs Restricted stock units whose vesting led to the tax-withholding disposition

Unvested RSUs Included 28,308 RSUs Unvested RSUs included in Brian Coppola’s 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 13,954 restricted stock units ("RSUs") previously"

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 28,308 unvested RSUs."

FAQ

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

What insider transaction did System1 (SST) executive Brian Coppola report?

Brian Coppola reported a tax-withholding disposition of 6,124 shares of System1 Class A Common Stock. The company withheld these shares to satisfy his tax obligations arising from the vesting of 13,954 restricted stock units (RSUs), rather than through an open-market sale.

How many System1 (SST) shares were withheld for taxes in this filing?

The company withheld 6,124 shares of System1 Class A Common Stock at $2.60 per share to cover Brian Coppola’s tax withholding obligation. This withholding occurred in connection with the vesting of 13,954 RSUs previously granted to him.

How many System1 (SST) shares does Brian Coppola own after this transaction?

Following the tax-withholding disposition, Brian Coppola directly owns 59,774 shares of System1 Class A Common Stock. This total includes 28,308 unvested RSUs, which are reported as part of his post-transaction holdings in the Form 4 footnotes.

What RSU vesting event triggered the share withholding at System1 (SST)?

The withholding was triggered when 13,954 restricted stock units (RSUs) previously granted to Brian Coppola vested. To cover the related tax withholding obligation, System1 retained 6,124 shares from the vested amount instead of delivering all shares to him.

Was Brian Coppola’s System1 (SST) transaction an open-market sale?

No, the reported transaction was a tax-withholding disposition, not an open-market sale. System1 withheld 6,124 shares from vested RSUs to satisfy Brian Coppola’s tax obligations, which is categorized under code F for payment of tax liability by delivering securities.

Does Brian Coppola still hold unvested RSUs in System1 (SST) after this event?

Yes. After the transaction, his reported holdings include 28,308 unvested RSUs. These unvested RSUs are in addition to his other directly held Class A Common Stock and are specifically noted in the Form 4 footnote describing his post-transaction position.

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^*

Coppola Brian

(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)
	Chief Ad Operations Officer

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		6,124(1)	D	$2.6	59,774(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 13,954 restricted stock units ("RSUs") previously granted to the reporting person, the Company withheld 6,124 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs.

2. Includes 28,308 unvested RSUs.

Remarks:

	/s/ Daniel Weinrot, Attorney-in-Fact for Brian Coppola	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)