System1 (SST) CFO receives 35,300 fully vested restricted stock units

Rhea-AI Filing Summary

Kidambi Tridivesh reported acquisition or exercise transactions in this Form 4 filing.

System1, Inc. reported that Chief Financial Officer Tridivesh Kidambi received a grant of 35,300 restricted stock units, each equal to one share of Class A Common Stock. The award was fully vested on the grant date, increasing his direct holdings to 181,815 shares. This total includes 52,514 unvested RSUs that remain subject to vesting conditions.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Kidambi Tridivesh

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Grant/Award	Class A Common Stock	35,300	$0.00	--

Holdings After Transaction: Class A Common Stock — 181,815 shares (Direct, null)

Footnotes (1)

1. Mr. Kidambi was granted 35,300 restricted stock units ("RSUs"), which was fully vested on the date of grant. Each RSU represents the right to receive one share of SST Class A Common Stock upon vesting. Includes 52,514 unvested RSUs.

Key Figures

RSUs granted: 35,300 shares Grant price: $0.0000 per share Shares after transaction: 181,815 shares +1 more

4 metrics

RSUs granted 35,300 shares Restricted stock units granted to CFO on 2026-05-29

Grant price $0.0000 per share Indicates equity award, not open-market purchase

Shares after transaction 181,815 shares Total direct holdings following the RSU grant

Unvested RSUs 52,514 units Unvested restricted stock units included in total holdings

Key Terms

restricted stock units, RSUs, Class A Common Stock, unvested RSUs

4 terms

restricted stock units financial

"Mr. Kidambi was granted 35,300 restricted stock units ("RSUs"), which was fully vested"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

RSUs financial

"Each RSU represents the right to receive one share of SST Class A Common Stock"

RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.

Class A Common Stock financial

"Each RSU represents the right to receive one share of SST Class A Common Stock"

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

unvested RSUs financial

"Includes 52,514 unvested RSUs."

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Form 4 Insider Transactions: What Each Field Means →

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^*

Kidambi Tridivesh

(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 Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/29/2026

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	05/29/2026		A		35,300(1)	A	$0	181,815(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. Mr. Kidambi was granted 35,300 restricted stock units ("RSUs"), which was fully vested on the date of grant. Each RSU represents the right to receive one share of SST Class A Common Stock upon vesting.

2. Includes 52,514 unvested RSUs.

Remarks:

	/s/ Daniel Weinrot, Attorney-in-Fact for Tridivesh Kidambi	06/02/2026
	** 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)

FAQ

What insider transaction did System1 (SST) report for its CFO?

System1 reported that CFO Tridivesh Kidambi received a grant of 35,300 restricted stock units. These RSUs represent compensation in the form of equity rather than a market purchase and were fully vested on the date of grant.

How many System1 shares does CFO Tridivesh Kidambi hold after this Form 4?

After the reported grant, CFO Tridivesh Kidambi holds 181,815 shares of System1 Class A Common Stock. This total includes both common shares and 52,514 unvested restricted stock units that will deliver shares as they satisfy vesting conditions.

Were the 35,300 System1 RSUs granted to the CFO purchased on the open market?

No, the 35,300 restricted stock units were granted as compensation at no cash cost per share. The filing shows a price of $0.0000 per share, indicating an award rather than an open-market stock purchase by the CFO.

What are restricted stock units (RSUs) in the System1 CFO grant?

Restricted stock units are promises to deliver shares in the future, typically tied to vesting conditions. In this case, each RSU equals one System1 Class A share, and the 35,300 awarded RSUs were fully vested immediately on the grant date.

How many unvested RSUs does the System1 CFO still have outstanding?

The filing notes that the CFO’s holdings include 52,514 unvested restricted stock units. These unvested RSUs represent additional potential shares of System1 Class A Common Stock that will be delivered only as the related vesting requirements are met.