Perimeter Solutions (PRM) director gains 2025 performance-based options

Rhea-AI Filing Summary

Perimeter Solutions, Inc. reported that director Robert S. Henderson acquired multiple stock option positions on February 26, 2026, reflecting vesting of previously granted performance-based options rather than open-market purchases. All transactions involve "Stock Option (right to buy)" awards recorded at an acquisition price of $0.00 per option in the form.

Footnotes explain that these options were originally granted between December 7, 2021 and December 23, 2025, typically covering options to purchase between 8,750 and 35,000 shares, vesting in five equal annual installments. For the fiscal year ending December 31, 2025, performance criteria were met or partially met, causing specific tranches to vest, including 2,655, 6,194, several grants of 7,000, and one grant of 1,750 options. No share sales or disposals are reported in this filing.

Insider Trade Summary

7 transactions reported

Mixed 7 txns

Insider Henderson Robert S

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (right to buy)	2,655	$0.00	--
Grant/Award	Stock Option (right to buy)	6,194	$0.00	--
Grant/Award	Stock Option (right to buy)	7,000	$0.00	--
Grant/Award	Stock Option (right to buy)	7,000	$0.00	--
Grant/Award	Stock Option (right to buy)	7,000	$0.00	--
Grant/Award	Stock Option (right to buy)	7,000	$0.00	--
Grant/Award	Stock Option (right to buy)	1,750	$0.00	--

Holdings After Transaction: Stock Option (right to buy) — 2,655 shares (Direct)

Footnotes (1)

1. On December 23, 2025, the reporting person was granted an option to purchase 15,000 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 2,655 shares of common stock. On February 12, 2025, the reporting person was granted an option to purchase 35,000 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 6,194 shares of common stock. On February 14, 2024, the reporting person was granted an option to purchase 35,000 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, 2025, 2026, 2027 and 2028. The performance criteria for 2025 were met, resulting in the vesting of the option as to 7,000 shares of common stock. On September 6, 2023, the reporting person was granted an option to purchase 35,000 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 7,000 shares of common stock. On February 15, 2023, the reporting person was granted an option to purchase 35,000 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 7,000 shares of common stock. On January 28, 2022, the reporting person was granted an option to purchase 35,000 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, 2022, 2023, 2024, 2025 and 2026. The performance criteria for 2025 were met, resulting in the vesting of the option as to 7,000 shares of common stock. On December 7, 2021, the reporting person was granted an option to purchase 8,750 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, 2022, 2023, 2024, 2025 and 2026. The performance criteria for 2025 were met, resulting in the vesting of the option as to 1,750 shares of common stock.

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^*

Henderson Robert S

(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
	Officer (give title below)		Other (specify below)

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)	$27.84	02/26/2026		A		2,655(1)		02/26/2026	12/23/2035	Common Stock	2,655	$0	2,655	D
Stock Option (right to buy)	$11.8	02/26/2026		A		6,194(2)		02/26/2026	02/12/2035	Common Stock	6,194	$0	6,194	D
Stock Option (right to buy)	$5.23	02/26/2026		A		7,000(3)		02/26/2026	02/14/2034	Common Stock	7,000	$0	14,000	D
Stock Option (right to buy)	$5.5	02/26/2026		A		7,000(4)		02/26/2026	09/06/2033	Common Stock	7,000	$0	21,000	D
Stock Option (right to buy)	$8.88	02/26/2026		A		7,000(5)		02/26/2026	02/15/2033	Common Stock	7,000	$0	21,000	D
Stock Option (right to buy)	$12.09	02/26/2026		A		7,000(6)		02/26/2026	01/28/2032	Common Stock	7,000	$0	28,000	D
Stock Option (right to buy)	$11.8	02/26/2026		A		1,750(7)		02/26/2026	12/07/2031	Common Stock	1,750	$0	7,000	D

Explanation of Responses:

1. On December 23, 2025, the reporting person was granted an option to purchase 15,000 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 2,655 shares of common stock.

2. On February 12, 2025, the reporting person was granted an option to purchase 35,000 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 6,194 shares of common stock.

3. On February 14, 2024, the reporting person was granted an option to purchase 35,000 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, 2025, 2026, 2027 and 2028. The performance criteria for 2025 were met, resulting in the vesting of the option as to 7,000 shares of common stock.

4. On September 6, 2023, the reporting person was granted an option to purchase 35,000 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 7,000 shares of common stock.

5. On February 15, 2023, the reporting person was granted an option to purchase 35,000 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 7,000 shares of common stock.

6. On January 28, 2022, the reporting person was granted an option to purchase 35,000 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, 2022, 2023, 2024, 2025 and 2026. The performance criteria for 2025 were met, resulting in the vesting of the option as to 7,000 shares of common stock.

7. On December 7, 2021, the reporting person was granted an option to purchase 8,750 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, 2022, 2023, 2024, 2025 and 2026. The performance criteria for 2025 were met, resulting in the vesting of the option as to 1,750 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.
* 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.

FAQ

What insider transaction did Perimeter Solutions (PRM) report for Robert S. Henderson?

Perimeter Solutions reported that director Robert S. Henderson acquired several tranches of stock options on February 26, 2026. These reflect vesting of earlier performance-based option grants tied to fiscal 2025 results, rather than market purchases, and no sales or disposals were included in this filing.

How many Perimeter Solutions (PRM) stock options vested from the December 23, 2025 grant?

From the December 23, 2025 grant, 2,655 stock options vested for Robert S. Henderson. That grant originally covered options to purchase 15,000 common shares, vesting over five years, and vesting of this tranche resulted from partial satisfaction of the company’s 2025 performance criteria.

What are the key terms of Robert S. Henderson’s February 12, 2025 option grant at Perimeter Solutions (PRM)?

On February 12, 2025, Henderson received an option to purchase 35,000 Perimeter Solutions shares, vesting in five equal annual installments. Vesting depends on performance criteria for fiscal years ending 2025 through 2029, and partial satisfaction of 2025 criteria led to 6,194 options vesting in this Form 4.

Which earlier Perimeter Solutions (PRM) option grants contributed to the February 26, 2026 vesting events?

The vesting events relate to grants dated February 14, 2024; September 6, 2023; February 15, 2023; January 28, 2022; and December 7, 2021. Each grant covered options to purchase 8,750 or 35,000 shares, vesting over five years based on specific performance criteria for each fiscal year.

Did the Form 4 for Perimeter Solutions (PRM) show any insider stock sales by Robert S. Henderson?

The Form 4 reports only acquisitions of derivative securities, specifically stock options vesting on February 26, 2026. All seven transactions are coded as grants or awards, and the transaction summary shows zero sales or disposals of Perimeter Solutions common stock or options in this filing.

How are Perimeter Solutions (PRM) performance criteria linked to Henderson’s 2025 option vesting?

Each option grant vests in five equal annual tranches if Perimeter Solutions meets defined performance criteria for each covered fiscal year. For fiscal 2025, the criteria were met or partially met, triggering vesting of specific tranches, which are reflected as option acquisitions in the February 26, 2026 Form 4.