WindAcre 10% holder sells 5,705,979 Perimeter shares

The WindAcre Partnership Master Fund, LP, a ten percent owner of Perimeter Solutions, Inc. (PRM), reported open‑market sales totaling 5,705,979 ordinary shares on June 26, 29 and 30, 2026 at prices between $33.00 and $36.25 per share.

Rhea-AI Filing Summary

The WindAcre Partnership Master Fund, LP, a ten percent owner of Perimeter Solutions, Inc. (PRM), reported open‑market sales totaling 5,705,979 ordinary shares on June 26, 29 and 30, 2026 at prices between $33.00 and $36.25 per share. Following these transactions, the Master Fund held 16,148,621 ordinary shares directly. Related entities The WindAcre Partnership LLC, The WindAcre General Partner LP, WAPGP LLC and Snehal Amin may be deemed to indirectly beneficially own these securities.

Filing Explained

The amendment changes the named reporting coverage; the disclosed sales leave 16,148,621 ordinary shares directly reported afterward.

A Form 4 reports an insider transaction, and this Form 4/A, filed July 13, 2026, amends the original June 30, 2026 filing by adding reporting persons after an administrative issue.

The amendment records ordinary-share sales dated June 26, June 29, and June 30, 2026, with 16,148,621 ordinary shares reported as directly beneficially owned following the transactions.

The transaction rows use code S, which the supplied Form 4 definition identifies as an open-market sale; this filing does not disclose a Rule 10b5-1 plan.

The securities are described as owned directly by The WindAcre Partnership Master Fund, LP, with indirect beneficial ownership attributed to related WindAcre entities and Snehal Amin, while each reporting person disclaims beneficial ownership except to the extent of any pecuniary interest.

The supplied 90-day insider record reports 10 sale transactions totaling 13,000,000 shares sold and no purchases recorded.

Insider Trade Summary

Net Seller: 5,705,979 shares

Net Sell 7 txns

Insider WINDACRE PARTNERSHIP LLC, WindAcre Partnership Master Fund, LP, WindAcre General Partner LP, WAPGP LLC, Amin Snehal

Role 10% Owner | 10% Owner | 10% Owner | 10% Owner | 10% Owner

Sold 5,705,979 shs ($195.61M)

Type	Security	Shares	Price	Value
Sale	Ordinary shares F1	1,875,000	$33.90	$63.56M
Sale	Ordinary shares F1	437,500	$33.00	$14.44M
Sale	Ordinary shares F1	378,600	$36.22	$13.71M
Sale	Ordinary shares F1	150,000	$34.98	$5.25M
Sale	Ordinary shares F1	2,296,400	$34.40	$79.00M
Sale	Ordinary shares F1	20,000	$36.25	$725K
Sale	Ordinary shares F1	548,479	$34.51	$18.93M

Holdings After Transaction: Ordinary shares — 16,148,621 shares (Direct)

Footnotes (1)

1. F1. The securities are owned directly by The WindAcre Partnership Master Fund, LP and may be deemed to be indirectly beneficially owned by (i) The WindAcre Partnership LLC, the investment adviser to the Master Fund, (ii) The WindAcre General Partner LP and The WAPGP LLC, the general partners of the Master Fund, and (iii) Snehal Amin, the managing member of The WindAcre Partnership LLC and The WAPGP LLC.

Key Figures

Total shares sold: 5,705,979 shares Sale price range: $33.00–$36.25 per share Shares held after transactions: 16,148,621 shares +2 more

5 metrics

Total shares sold 5,705,979 shares Aggregate open‑market sales on June 26, 29 and 30, 2026

Sale price range $33.00–$36.25 per share Prices for reported open‑market sales of ordinary shares

Shares held after transactions 16,148,621 shares Direct holdings of The WindAcre Partnership Master Fund, LP after June 30, 2026 sale

Largest single block sold 2,296,400 shares Open‑market sale on June 26, 2026 at $34.4000 per share

June 29, 2026 sale 437,500 shares at $33.0000 Non‑derivative open‑market sale of ordinary shares

Key Terms

ten percent owner, open-market sale, beneficially owned, investment adviser, +1 more

5 terms

ten percent owner regulatory

"reporting persons are indicated as a ten percent owner"

open-market sale financial

"transaction_action is described as an open-market sale"

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.

beneficially owned regulatory

"securities may be deemed to be indirectly beneficially owned"

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.

investment adviser financial

"The WindAcre Partnership LLC is the investment adviser to the Master Fund"

An investment adviser is a person or firm that professionally manages money and gives recommendations about buying, selling, or holding investments. Like a financial coach or guide, they have a legal duty to act in a client's best financial interest, so their advice, fees and potential conflicts can directly affect returns and risk — making their role important for investors who want informed, accountable help with portfolios.

general partners financial

"The WindAcre General Partner LP and The WAPGP LLC are the general partners"

General partners are the people or firms that run and make day-to-day decisions for a partnership or investment fund, taking primary responsibility for its operations and obligations. They matter to investors because they control strategy, bear more legal and financial risk than passive backers, and their skill and incentives largely determine returns—think of them as the fund’s captain who both steers the ship and shares in the voyage’s upside and downside.

FAQ

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

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

The WindAcre Partnership Master Fund, LP reported open‑market sales of 5,705,979 ordinary shares of Perimeter Solutions on June 26, 29 and 30, 2026 at prices between $33.00 and $36.25 per share, reflecting a significant multi‑day disposition by a ten percent owner.

Over what dates did the PRM insider share sales occur and at what prices?

The reported PRM insider sales occurred on June 26, 29 and 30, 2026. Trade prices ranged from $33.00 to $36.25 per ordinary share, indicating several separate open‑market transactions within a relatively narrow price band during that three‑day period.

How many Perimeter Solutions (PRM) shares does WindAcre hold after these sales?

After completing the reported transactions, The WindAcre Partnership Master Fund, LP directly held 16,148,621 ordinary shares of Perimeter Solutions. This figure reflects the position following the June 30, 2026 open‑market sale disclosed in the Form 4/A data.

Which entity actually owns the PRM shares sold and who may be indirect owners?

The securities are owned directly by The WindAcre Partnership Master Fund, LP. According to the disclosure, The WindAcre Partnership LLC, The WindAcre General Partner LP, WAPGP LLC and Snehal Amin may be deemed to indirectly beneficially own these shares through advisory and general partner roles.

What is the role of WindAcre and related entities in Perimeter Solutions (PRM)?

WindAcre entities are reported as ten percent owners of Perimeter Solutions. The Master Fund holds the shares directly, while The WindAcre Partnership LLC acts as investment adviser and The WindAcre General Partner LP and WAPGP LLC serve as general partners, with Snehal Amin as managing member of key entities.

Were the PRM insider transactions open‑market sales or other types of transfers?

All reported transactions are coded “S” and described as open‑market or private sales of ordinary shares. There are no option exercises, gifts, or tax‑withholding entries in this data; the filing only reports non‑derivative sales of common equity.

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

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Available on EDGAR 07/13/2026 - 05:31 PM Accepted by SEC EDGAR 07/13/2026 - 05:30 PM Learn about SEC filing dates

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

X

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^*

WINDACRE PARTNERSHIP LLC

(Last) (First) (Middle)

2200 POST OAK BOULEVARD

SUITE 1580

(Street)

HOUSTON TEXAS 77056

(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)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/26/2026

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

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

4. If Amendment, Date of Original Filed (Month/Day/Year)
06/30/2026

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)
			Code	V	Amount	(A) or (D)	Price
Ordinary shares	06/26/2026		S		378,600	D	$36.22	21,476,000	D(1)
Ordinary shares	06/26/2026		S		150,000	D	$34.98	21,326,000	D(1)
Ordinary shares	06/26/2026		S		2,296,400	D	$34.4	19,029,600	D(1)
Ordinary shares	06/26/2026		S		20,000	D	$36.25	19,009,600	D(1)
Ordinary shares	06/26/2026		S		548,479	D	$34.51	18,461,121	D(1)
Ordinary shares	06/29/2026		S		437,500	D	$33	18,023,621	D(1)
Ordinary shares	06/30/2026		S		1,875,000	D	$33.9	16,148,621	D(1)

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

WINDACRE PARTNERSHIP LLC

(Last) (First) (Middle)

2200 POST OAK BOULEVARD

SUITE 1580

(Street)

HOUSTON TEXAS 77056

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

WindAcre Partnership Master Fund, LP

(Last) (First) (Middle)

2200 POST OAK BOULEVARD

SUITE 1580

(Street)

HOUSTON TEXAS 77056

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

WindAcre General Partner LP

(Last) (First) (Middle)

2200 POST OAK BOULEVARD

SUITE 1580

(Street)

HOUSTON TEXAS 77056

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

WAPGP LLC

(Last) (First) (Middle)

2200 POST OAK BOULEVARD

SUITE 1580

(Street)

HOUSTON TEXAS 77056

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Amin Snehal

(Last) (First) (Middle)

2200 POST OAK BOULEVARD

SUITE 1580

(Street)

HOUSTON TEXAS 77056

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. The securities are owned directly by The WindAcre Partnership Master Fund, LP and may be deemed to be indirectly beneficially owned by (i) The WindAcre Partnership LLC, the investment adviser to the Master Fund, (ii) The WindAcre General Partner LP and The WAPGP LLC, the general partners of the Master Fund, and (iii) Snehal Amin, the managing member of The WindAcre Partnership LLC and The WAPGP LLC.

Remarks:

This amendment is being filed to add certain Reporting Persons following the resolution of an administrative issue that prevented them from being included in the original Form 4 filing on June 30, 2026. Each Reporting Person disclaims beneficial ownership in the securities reported on this Form 4 except to the extent of its or his pecuniary interest, if any, therein, and this report shall not be deemed to be an admission that such Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

	The WindAcre Partnership LLC, By: /s/ Snehal Amin, Managing Member	07/13/2026
	The WindAcre Partnership Master Fund, LP, By: The WAP GP LLC, its General Partner, By: /s/ Snehal Amin, Managing Member	07/13/2026
	The WindAcre General Partner LP, By: The WAP GP LLC, its General Partner, By: /s/ Snehal Amin, Managing Member	07/13/2026
	The WAP GP LLC, By: /s/ Snehal Amin, Managing Member	07/13/2026
	/s/ Snehal Amin	07/13/2026
	** 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)