Robert S. Henderson - 26 Feb 2026 Form 4 Insider Report for Perimeter Solutions, Inc. (PRM)

Role: Director
Signature: /s/ Noriko Yokozuka, as Attorney-in-Fact
Issuer symbol: PRM
Transactions as of: 26 Feb 2026
Net transactions value: $0
Form type: 4
Filing time: 02 Mar 2026, 17:28:35 UTC
Previous filing: 21 Feb 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Henderson Robert S	Director	C/O PERIMETER SOLUTIONS, INC, 8000 MARYLAND AVE., SUITE 350, CLAYTON	/s/ Noriko Yokozuka, as Attorney-in-Fact	02 Mar 2026	0001352561

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	PRM	Stock Option (right to buy)	Award	$0	+2,655		$0.000000	2,655	26 Feb 2026	Common Stock	2,655	$27.84	Direct	F1
transaction	PRM	Stock Option (right to buy)	Award	$0	+6,194		$0.000000	6,194	26 Feb 2026	Common Stock	6,194	$11.80	Direct	F2
transaction	PRM	Stock Option (right to buy)	Award	$0	+7,000	+100%	$0.000000	14,000	26 Feb 2026	Common Stock	7,000	$5.23	Direct	F3
transaction	PRM	Stock Option (right to buy)	Award	$0	+7,000	+50%	$0.000000	21,000	26 Feb 2026	Common Stock	7,000	$5.50	Direct	F4
transaction	PRM	Stock Option (right to buy)	Award	$0	+7,000	+50%	$0.000000	21,000	26 Feb 2026	Common Stock	7,000	$8.88	Direct	F5
transaction	PRM	Stock Option (right to buy)	Award	$0	+7,000	+33%	$0.000000	28,000	26 Feb 2026	Common Stock	7,000	$12.09	Direct	F6
transaction	PRM	Stock Option (right to buy)	Award	$0	+1,750	+33%	$0.000000	7,000	26 Feb 2026	Common Stock	1,750	$11.80	Direct	F7

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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.
F2	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.
F3	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.
F4	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.
F5	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.
F6	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.
F7	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.