Perimeter Solutions (NYSE: PRM) CEO reports new performance option vesting

Rhea-AI Filing Summary

Perimeter Solutions, Inc. director and Chief Executive Officer Haitham Khouri reported the vesting of previously granted stock options tied to 2025 performance. Three tranches of options to purchase common stock became vested awards: 88,489 shares from a February 12, 2025 grant for 500,000 shares where performance criteria were partially met, 100,000 shares from a February 14, 2024 grant for 500,000 shares where performance criteria were met, and 400,000 shares from a March 8, 2023 grant for 2,000,000 shares where performance criteria were met. These awards are shown as stock option acquisitions at a price per share of $0.0000, increasing his directly held option positions.

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

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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^*

Khouri Haitham

(Last) (First) (Middle)

C/O PERIMETER SOLUTIONS, INC.

8000 MARYLAND AVE., SUITE 350

(Street)

CLAYTON MO 63105

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Perimeter Solutions, Inc. [ PRM ]

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

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/26/2026

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

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

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

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

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
Stock Option (right to buy)	$11.8	02/26/2026		A		88,489(1)		02/26/2026	02/12/2035	Common Stock	88,489	$0	88,489	D
Stock Option (right to buy)	$5.23	02/26/2026		A		100,000(2)		02/26/2026	02/14/2034	Common Stock	100,000	$0	200,000	D
Stock Option (right to buy)	$8.26	02/26/2026		A		400,000(3)		02/26/2026	03/08/2033	Common Stock	400,000	$0	1,200,000	D

Explanation of Responses:

1. On February 12, 2025, the reporting person was granted an option to purchase 500,000 shares of common stock. The option vests in five equal annual installments based on the Issuer's satisfaction of certain performance criteria for each of the fiscal years ending December 31, 2025, 2026, 2027, 2028 and 2029. The performance criteria for 2025 were partially met, resulting in the vesting of the option as to 88,489 shares of common stock.

2. On February 14, 2024, the reporting person was granted an option to purchase 500,000 shares of common stock. The option vests in five equal annual installments based on the Issuer's satisfaction of certain performance criteria for each of the fiscal years ending December 31, 2024, 2026, 2026, 2027 and 2028. The performance criteria for 2025 were met, resulting in the vesting of the option as to 100,000 shares of common stock.

3. On March 8, 2023, the reporting person was granted an option to purchase 2,000,000 shares of common stock. The option vests in five equal annual installments based on the Issuer's satisfaction of certain performance criteria for each of the fiscal years ending December 31, 2023, 2024, 2025, 2026 and 2027. The performance criteria for 2025 were met, resulting in the vesting of the option as to 400,000 shares of common stock.

Remarks:

	/s/ Noriko Yokozuka, as Attorney-in-Fact	03/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What did PRM CEO Haitham Khouri report in this Form 4 filing?

Haitham Khouri reported vesting of previously granted stock options tied to 2025 performance. Three tranches vested: 88,489, 100,000, and 400,000 option shares, all shown as acquisitions at $0.0000 per share, increasing his directly held option positions in Perimeter Solutions.

How many Perimeter Solutions stock options vested for the CEO based on 2025 performance?

Three groups of options vested based on 2025 performance: 88,489 shares from a 2025 grant, 100,000 shares from a 2024 grant, and 400,000 shares from a 2023 grant. Each tranche reflects performance criteria being met or partially met for the 2025 fiscal year.

What performance-based stock option grants does PRM’s CEO hold according to this Form 4?

The CEO holds performance-based options from three grants: 500,000 shares granted on February 12, 2025, 500,000 shares granted on February 14, 2024, and 2,000,000 shares granted on March 8, 2023. Each grant vests in five equal annual installments if specified performance criteria are satisfied.

Were any Perimeter Solutions shares sold by the CEO in this Form 4?

No sales are reported. All transactions use code A for grants or awards and are labeled as acquisitions of stock options. The filing shows vesting of options at $0.0000 per share, with no sell transactions or dispositions disclosed for Haitham Khouri in this report.

How are the PRM CEO’s performance option grants structured over time?

Each option grant vests in five equal annual installments, contingent on meeting performance criteria for specific fiscal years. The grants cover fiscal years ending December 31 from 2023 through 2029, and vesting occurs only where the issuer’s stated performance criteria for a given year are satisfied.

What are the post-transaction stock option holdings reported for PRM’s CEO?

After these vesting events, one transaction shows 88,489 options held, another shows 200,000 options following that vesting, and another lists 1,200,000 options following its vesting. These figures reflect directly owned stock options to purchase Perimeter Solutions common stock.