Perimeter Solutions (PRM) CEO Haitham Khouri sells 229,535 shares

Filing Impact

(Very High)

Filing Sentiment

(Very Negative)

Form Type

Rhea-AI Filing Summary

Perimeter Solutions, Inc. director and Chief Executive Officer Haitham Khouri reported open-market sales of a total of 229,535 shares of Common Stock across three days. He sold 20,300 shares on May 20, 2026 at a weighted average price of $34.09 per share, with individual trade prices ranging from approximately $34.00 to $34.28. On May 21, 2026, he sold 91,724 shares at a weighted average price of $31.91, with prices between about $31.32 and $33.18. On May 22, 2026, he sold 117,511 shares at a weighted average price of $31.19, with prices between roughly $30.54 and $31.61. Following the most recent transaction, Khouri directly holds 1,874,615 shares of Perimeter Solutions common stock.

Insider Trade Summary

Net Seller: 229,535 shares ($7,284,108)

Net Sell 3 txns

Insider Khouri Haitham

Role Chief Executive Officer

Sold 229,535 shs ($7.28M)

Type	Security	Shares	Price	Value
Sale	Common Stock	117,511	$31.19	$3.67M
Sale	Common Stock	91,724	$31.91	$2.93M
Sale	Common Stock	20,300	$34.09	$692K

Holdings After Transaction: Common Stock — 1,874,615 shares (Direct, null)

Footnotes (1)

Represents the weighted average price of the shares sold. The prices of the shares sold pursuant to the transaction ranged from approximately $34.00 to $34.28 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. Represents the weighted average price of the shares sold. The prices of the shares sold pursuant to the transaction ranged from approximately $31.32 to $33.18 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. Represents the weighted average price of the shares sold. The prices of the shares sold pursuant to the transaction ranged from approximately $30.54 to $31.61 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.

Key Figures

Total shares sold: 229,535 shares Shares sold May 20, 2026: 20,300 shares at $34.09/share Shares sold May 21, 2026: 91,724 shares at $31.91/share +5 more

8 metrics

Total shares sold 229,535 shares Aggregate sales reported in Form 4

Shares sold May 20, 2026 20,300 shares at $34.09/share Weighted average price, Common Stock

Shares sold May 21, 2026 91,724 shares at $31.91/share Weighted average price, Common Stock

Shares sold May 22, 2026 117,511 shares at $31.19/share Weighted average price, Common Stock

Price range May 20, 2026 $34.00–$34.28/share Footnote F1 price range for sales

Price range May 21, 2026 $31.32–$33.18/share Footnote F2 price range for sales

Price range May 22, 2026 $30.54–$31.61/share Footnote F3 price range for sales

Shares held after latest sale 1,874,615 shares Direct ownership after May 22, 2026 transaction

Key Terms

open-market sale, weighted average price, Common Stock, Form 4, +1 more

5 terms

open-market sale financial

"transaction_action: "open-market sale" for each Common Stock transaction"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

weighted average price financial

"Represents the weighted average price of the shares sold."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

Common Stock financial

"security_title: "Common Stock" for each reported transaction"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

beneficially owned financial

"total shares beneficially owned following the reported transaction"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Form 4 Insider Transactions: What Each Field Means →

05/22/2026 - 05:39 PM

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^*

Khouri Haitham

(Last)

(First)

(Middle)

C/O PERIMETER SOLUTIONS, INC.

8000 MARYLAND AVE., SUITE 350

(Street)

CLAYTON

MISSOURI

63105

(City)

(State)

(Zip)

UNITED STATES

(Country)

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
X	Officer (give title below)	Other (specify below)
	Chief Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/20/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/20/2026		S		20,300	D	$34.09⁽¹⁾	2,083,850	D
Common Stock	05/21/2026		S		91,724	D	$31.91⁽²⁾	1,992,126	D
Common Stock	05/22/2026		S		117,511	D	$31.19⁽³⁾	1,874,615	D

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Represents the weighted average price of the shares sold. The prices of the shares sold pursuant to the transaction ranged from approximately $34.00 to $34.28 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.

2. Represents the weighted average price of the shares sold. The prices of the shares sold pursuant to the transaction ranged from approximately $31.32 to $33.18 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.

3. Represents the weighted average price of the shares sold. The prices of the shares sold pursuant to the transaction ranged from approximately $30.54 to $31.61 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.

Remarks:

	/s/ Noriko Yokozuka, as Attorney-in-Fact	05/22/2026
	** 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.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transactions did Perimeter Solutions (PRM) report for Haitham Khouri?

Perimeter Solutions reported that CEO and director Haitham Khouri sold 229,535 shares of Common Stock in three open-market transactions on May 20, 21 and 22, 2026, as disclosed in a Form 4 insider filing.

At what prices did Perimeter Solutions (PRM) CEO Haitham Khouri sell shares?

Haitham Khouri’s reported sales used weighted average prices of $34.09, $31.91 and $31.19 per share. Footnotes state individual trades ranged from about $34.00–$34.28, $31.32–$33.18 and $30.54–$31.61, respectively.

How many Perimeter Solutions (PRM) shares does Haitham Khouri hold after the reported sales?

After the May 22, 2026 transaction, Haitham Khouri directly holds 1,874,615 shares of Perimeter Solutions Common Stock. This figure comes from the Form 4 table showing total shares beneficially owned following the most recent reported sale.

Over what dates did Perimeter Solutions (PRM) CEO sell shares in this Form 4?

The Form 4 shows open-market sales of Perimeter Solutions Common Stock by CEO Haitham Khouri on May 20, May 21 and May 22, 2026, with separate reported share amounts and weighted average sale prices for each date.

What is the total number of Perimeter Solutions (PRM) shares sold in this Form 4?

The aggregate shares sold total 229,535, combining 20,300 shares on May 20, 91,724 shares on May 21 and 117,511 shares on May 22, 2026, as summarized in the Form 4 transaction data.