PRM insider William Thorndike reports 650K-share disposals

PRM filing: William Thorndike reported multiple dispositions of Common Stock.

Rhea-AI Filing Summary

PRM filing: William Thorndike reported multiple dispositions of Common Stock. The filing lists a gift of 500,000 shares on 12/19/2025 and sales on 03/04/2026, 03/05/2026, 03/06/2026, 03/09/2026, 03/10/2026, and 03/11/2026, comprising 125,000; 100,000; 100,000; 125,000; 100,000; and 100,000 shares respectively. The listed sales aggregate to 650,000 shares disposed across those March dates.

Insights

Insider Transactions Analyst

Thorndike reported a gift and multiple open-market sales totaling 650,000 shares in early March 2026.

The filing documents a gift of 500,000 shares on 12/19/2025 and individual Common Stock dispositions on 03/04/2026 (125,000), 03/05/2026 (100,000), 03/06/2026 (100,000), 03/09/2026 (125,000), 03/10/2026 (100,000), and 03/11/2026 (100,000), which sum to 650,000 shares.

These items are reported as dispositions; the filing shows transaction dates and share counts but does not state pricing, proceeds recipients, or whether sales were pursuant to a trading plan. Subsequent filings would be required to show consideration or remaining holdings.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did William Thorndike report in the PRM Form 144?

Thorndike reported a gift of 500,000 shares on 12/19/2025 and multiple sales in March 2026. The March dispositions list 125,000; 100,000; 100,000; 125,000; 100,000; and 100,000 shares on stated dates.

How many shares were sold by Thorndike in March 2026 under the filing for PRM?

The filing lists six March sales that together total 650,000 shares (125,000; 100,000; 100,000; 125,000; 100,000; 100,000). Each sale is shown with its specific transaction date in early March 2026.

Does the Form 144 disclose sale prices or proceeds for PRM transactions?

No. The excerpt lists dates and share counts for each disposition but does not include sale prices or the dollar proceeds received. Pricing and proceeds are not provided in the provided content.

Was any resale method or trading plan specified for the PRM sales?

The provided excerpt documents the dates and share counts but does not describe methods of sale or reference any trading plan. Details on sale method or plan are not included in the excerpt.

What is the earliest transfer recorded in the PRM filing?

The excerpt shows a recorded gift of 500,000 shares on 12/19/2025, which is the earliest dated transfer listed before the March 2026 sales.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/12/2026 - 12:29 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001437827
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Perimeter Solutions Inc
SEC File Number	001-41027
Address of Issuer	8000 Maryland Avenue, Suite 350 Clayton MISSOURI 63105
Phone	3143967343
Name of Person for Whose Account the Securities are To Be Sold	Cromwell Harbor Supporting Foundation
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Foundation of Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	UBS Financial Services Inc 1000 Harbor Blvd 3rd Floor Weehawken NJ 07086	115000	2655350	149440060	03/12/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	12/19/2025	Gift	William Thorndike		11/08/2021	500000	11/08/2021	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
William Thorndike 800 Boylston Street, Suite 2220 Boston MA 02199	Common	03/04/2026	125000	3025666
William Thorndike 800 Boylston Street, Suite 2220 Boston MA 02199	Common	03/05/2026	100000	2401098
William Thondike 800 Boylston Street, Suite 2220 Boston MA 02199	Common	03/06/2026	100000	2357725
William Thorndike 800 Boylston Street, Suite 2220 Boston MA 02199	Common	03/09/2026	125000	2914666
William Thorndike 800 Boylston Street, Suite 2220 Boston MA 02199	Common	03/10/2026	100000	2358277
William Thorndike 800 Boylston Street Ste 2220 Boston MA 02199	Common	03/11/2026	100000	2313282

144: Remarks and Signature

Remarks	William Thorndike is a Director of the issuing company. The seller is a foundation of which William Thorndike is also a Director.
Date of Notice	03/12/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/Mijo Suric, for UBS Financial Services Inc, as attorney-in-fact for Cromwell Harbor Supporting Foundation
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)