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

Reporting relationship: Director
Issuer ticker: PRM
Reported as of: 26 Feb 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 02 Mar 2026, 17:28:35 UTC
Prior SEC filing: 21 Feb 2025
Source filing: View source filing
Reporting owner signature: /s/ Noriko Yokozuka, as Attorney-in-Fact

Key filing fact

Robert S. Henderson filed Form 4 for Perimeter Solutions, Inc. (PRM) on 02 Mar 2026.

Key facts

This page summarizes Robert S. Henderson's Form 4 filing for Perimeter Solutions, Inc. (PRM).
7 reported transactions and 7 derivative rows are listed below.
Accepted by SEC: 02 Mar 2026, 17:28.

Change

Previous filing in this sequence was filed on 21 Feb 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001352561 Primary reporting owner

Henderson Robert S

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

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

PRM transaction Derivative

Stock Option (right to buy)

Award

Transaction value: $0
Shares: +2,655
Change %
Price: $0.000000
Shares after: 2,655
Date: 26 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,655
Exercise price: $27.84
Footnotes: F1

PRM transaction Derivative

Stock Option (right to buy)

Award

Transaction value: $0
Shares: +6,194
Change %
Price: $0.000000
Shares after: 6,194
Date: 26 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 6,194
Exercise price: $11.80
Footnotes: F2

PRM transaction Derivative

Stock Option (right to buy)

Award

Transaction value: $0
Shares: +7,000
Change %: +100%
Price: $0.000000
Shares after: 14,000
Date: 26 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,000
Exercise price: $5.23
Footnotes: F3

PRM transaction Derivative

Stock Option (right to buy)

Award

Transaction value: $0
Shares: +7,000
Change %: +50%
Price: $0.000000
Shares after: 21,000
Date: 26 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,000
Exercise price: $5.50
Footnotes: F4

PRM transaction Derivative

Stock Option (right to buy)

Award

Transaction value: $0
Shares: +7,000
Change %: +50%
Price: $0.000000
Shares after: 21,000
Date: 26 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,000
Exercise price: $8.88
Footnotes: F5

PRM transaction Derivative

Stock Option (right to buy)

Award

Transaction value: $0
Shares: +7,000
Change %: +33%
Price: $0.000000
Shares after: 28,000
Date: 26 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,000
Exercise price: $12.09
Footnotes: F6

PRM transaction Derivative

Stock Option (right to buy)

Award

Transaction value: $0
Shares: +1,750
Change %: +33%
Price: $0.000000
Shares after: 7,000
Date: 26 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1,750
Exercise price: $11.80
Footnotes: F7

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 7 footnotes

Footnote 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.

Footnote 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.

Footnote 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.

Footnote 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.

Footnote 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.

Footnote 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.

Footnote 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.