William N. Thorndike Jr. - 09 Mar 2026 Form 4 Insider Report for Perimeter Solutions, Inc. (PRM)

Reporting relationship: Director
Issuer ticker: PRM
Reported as of: 09 Mar 2026
Net transaction value: -$7,601,921
SEC form: 4
Accepted by SEC: 11 Mar 2026, 19:19:17 UTC
Prior SEC filing: 06 Mar 2026
Next SEC filing: 06 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Noriko Yokozuka, as Attorney-in-Fact

Key filing fact

William N. Thorndike Jr. filed Form 4 for Perimeter Solutions, Inc. (PRM) on 11 Mar 2026.

Key facts

This page summarizes William N. Thorndike Jr.'s Form 4 filing for Perimeter Solutions, Inc. (PRM).
4 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 11 Mar 2026, 19:19.

Change

Previous filing in this sequence was filed on 06 Mar 2026.
Current net transaction value: -$7,601,921.

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 0001437827 Primary reporting owner

Thorndike William N Jr

Relationship: Director
Address: C/O PERIMETER SOLUTIONS, INC., 8000 MARYLAND AVE., SUITE 350, CLAYTON
Signature: /s/ Noriko Yokozuka, as Attorney-in-Fact
Signature date: 11 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

PRM transaction

Common Stock

Sale

Transaction value: $2,087,197
Shares: -90,043
Change %: -1%
Price: $23.18
Shares after: 8,770,613
Date: 09 Mar 2026
Ownership: Direct
Footnotes: F1

PRM transaction

Common Stock

Sale

Transaction value: $833,724
Shares: -34,957
Change %: -0.4%
Price: $23.85
Shares after: 8,735,656
Date: 09 Mar 2026
Ownership: Direct
Footnotes: F2

PRM transaction

Common Stock

Sale

Transaction value: $2,363,000
Shares: -100,000
Change %: -1.1%
Price: $23.63
Shares after: 8,635,656
Date: 10 Mar 2026
Ownership: Direct
Footnotes: F3

PRM transaction

Common Stock

Sale

Transaction value: $2,318,000
Shares: -100,000
Change %: -1.2%
Price: $23.18
Shares after: 8,535,656
Date: 11 Mar 2026
Ownership: Direct
Footnotes: F4

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

Represents the weighted average price of the shares sold on March 9, 2026. The prices of the shares sold pursuant to the transaction ranged from approximately $22.71 to $23.71 per share. The Reporting Person, upon request, will provide the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price.

Footnote F2

Represents the weighted average price of the shares sold on March 9, 2026. The prices of the shares sold pursuant to the transaction ranged from approximately $23.73 to $23.95 per share. The Reporting Person, upon request, will provide the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price.

Footnote F3

Represents the weighted average price of the shares sold on March 10, 2026. The prices of the shares sold pursuant to the transaction ranged from approximately $23.33 to $23.97 per share. The Reporting Person, upon request, will provide the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price.

Footnote F4

Represents the weighted average price of the shares sold on March 11, 2026. The prices of the shares sold pursuant to the transaction ranged from approximately $22.72 to $23.40 per share. The Reporting Person, upon request, will provide the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price.