Comparable stake leader
FMR LLC
SEC ownership of Perimeter Solutions, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001880319.
Disclosed value leader
WINDACRE PARTNERSHIP LLC
Comparable rows
50/50
Latest evidence
26 Jun 2026
- Public ticker
- PRM on NYSE
- Parsed ownership sources
-
13F, 13D/G, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
FMR LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
FMR LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
26 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001880319
- Issuer location
- Clayton, MO
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Perimeter Solutions, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
FMR LLC
Disclosed value leader
WINDACRE PARTNERSHIP LLC
Comparable rows
50/50
Latest evidence
26 Jun 2026
13F
13D/G
3/4/5
Lead comparable stake: 6.7%
13D/G row: FMR LLC
Showing 1-8 of 50 holder rows.
Quick read
FMR LLC leads the comparable SEC ownership view at 6.7%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens FMR LLC's linked filing trail.
Comparable ownership
Top 5
FMR LLC
6.7%
William N. Thorndike Jr.
5.7%
Matrix Capital Management Company...
4.5%
WindAcre Partnership Master Fund, LP
13%
WINDACRE PARTNERSHIP LLC
9.9%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| FMR LLC |
13F
13D/G
Company
|
6.7%
from 13D/G
|
$220,735,063
9,039,110 shares
|
— | 31 Mar 2026 |
| William N. Thorndike Jr. |
13D/G
3/4/5
Director
|
5.7%
|
$254,703,570
9,309,341 shares
|
$0 | 03 Mar 2026 |
| Matrix Capital Management Company, LP |
13D/G
|
4.5%
|
$66,850,800
6,554,000 shares
|
$0 | 31 Dec 2024 |
| WindAcre Partnership Master Fund, LP |
3/4/5
10%+ Owner
|
13%
|
$305,527,308
21,854,600 shares
|
— | 27 Jun 2025 |
| WINDACRE PARTNERSHIP LLC |
3/4/5
13F
10%+ Owner · Company
|
9.9%
|
$547,438,251
16,148,621 shares
|
-$195,609,062 | 26 Jun 2026 |
| W. Nicholas Howley |
3/4/5
Director
|
0.37%
|
$14,803,404
606,200 shares
|
— | 23 Apr 2026 |
| PRINCIPAL FINANCIAL GROUP INC |
13F
Company
|
7.7%
|
$305,572,214
12,513,159 shares
|
— | 31 Mar 2026 |
| BlackRock, Inc. |
13F
Company
|
6.6%
|
$264,453,459
10,829,380 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$247,743,857.
Buys
$0
Insiders: 0
Sells
$247,743,857
Insiders: 7
Net
-$247,743,857
Shares: -7,638,014
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 7,638,014
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 6,385,514 | $0 | $217,455,686 | -$217,455,686 |
| 3-6 | 0 | 650,000 | $0 | $15,403,421 | -$15,403,421 |
| 6-9 | 0 | 237,500 | $0 | $6,757,500 | -$6,757,500 |
| 9-12 | 0 | 365,000 | $0 | $8,127,250 | -$8,127,250 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 22 reporting-owner rows connected to Perimeter Solutions, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
22
Largest Forms 3/4/5 holder
WINDACRE PARTNERSHIP LLC
Net 12M change
-$247,743,857
Latest report
26 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| WINDACRE PARTNERSHIP LLC | 10%+ Owner | $547,438,251 | -$195,609,062 | -26% | Filing P/S | 26 Jun 2026 |
| WindAcre Partnership Master Fund, LP | 10%+ Owner | $305,527,308 | Filing P/S | 27 Jun 2025 | ||
| William N. Thorndike Jr. | Director | $197,856,506 | -$15,403,421 | -7.2% | Filing P/S | 09 Mar 2026 |
| Haitham Khouri | Chief Executive Officer, Director | $58,469,241 | -$7,284,108 | -11% | Filing P/S | 20 May 2026 |
| Vivek Raj | Director | $18,609,441 | -$561,250 | -2.9% | Mixed | 03 Mar 2026 |
| W. Nicholas Howley | Director | $14,803,404 | Median | 23 Apr 2026 | ||
| Tracy Britt Cool | Director | $6,853,488 | Mixed | 03 Mar 2026 | ||
| Shannon Horn | Business Director | $4,657,513 | Mixed | 30 Mar 2022 | ||
| Edward D. Goldberg | Vice Chairman, Director | $2,856,079 | Mixed | 20 Feb 2025 | ||
| Barry Lederman | Chief Financial Officer | $2,052,547 | Mixed | 30 Mar 2022 | ||
| Ernest C. Kremling II | Chief Operating Officer | $1,572,704 | Mixed | 30 Mar 2022 | ||
| Noriko Yokozuka | General Counsel | $1,341,145 | -$3,910,500 | -74% | Filing P/S | 26 Feb 2026 |
| Kevin M. Stein | Director | $1,201,750 | Mixed | 08 Nov 2021 | ||
| Stephen Cornwall | Chief Commercial Officer | $439,809 | Mixed | 30 Mar 2022 | ||
| Kyle Sable | Chief Financial Officer | $0 | -$11,721,496 | -100% | Mixed | 13 May 2026 |
| Jeffrey Emery | President - Global Fire Safety | $0 | -$13,254,020 | -100% | Mixed | 13 May 2026 |
| Grant Bowman | President, Specialty Products | Mixed | 26 Feb 2026 | |||
| Sean P. Hennessy | Director | Mixed | 26 Feb 2026 | |||
| III Jorge L. Valladares | Director | Mixed | 26 Feb 2026 | |||
| Robert S. Henderson | Director | Mixed | 26 Feb 2026 |
Recent insider transactions for Perimeter Solutions, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Windacre Partnership Llc | PRM | Ordinary shares | Sale | -10.4% | $63,562,500 | $33.90 | -1,875,000 | 16,148,621 | 30 Jun 2026 | Direct |
| Windacre Partnership Llc | PRM | Ordinary shares | Sale | -2.37% | $14,437,500 | $33.00 | -437,500 | 18,023,621 | 29 Jun 2026 | Direct |
| Windacre Partnership Llc | PRM | Ordinary shares | Sale | -15.5% | $117,609,062 | $34.66 | -3,393,479 | 18,461,121 | 26 Jun 2026 | Direct |
| Haitham Khouri | PRM | Common Stock | Sale | -5.9% | $3,665,168 | $31.19 | -117,511 | 1,874,615 | 22 May 2026 | Direct |
| Haitham Khouri | PRM | Common Stock | Sale | -4.4% | $2,926,913 | $31.91 | -91,724 | 1,992,126 | 21 May 2026 | Direct |
| Haitham Khouri | PRM | Common Stock | Sale | -0.96% | $692,027 | $34.09 | -20,300 | 2,083,850 | 20 May 2026 | Direct |
| Kyle Sable | PRM | Common Stock | Sale | -100% | $1,639,067 | $33.09 | -49,540 | 0 | 13 May 2026 | Direct |
| Kyle Sable | PRM | Common Stock | Options Exercise | 49,540 | 49,540 | 13 May 2026 | Direct | |||
| Kyle Sable | PRM | Stock Option (right to buy) | Options Exercise | -41.4% | -49,540 | 70,000 | 13 May 2026 | Direct | ||
| Jeffrey Emery | PRM | Common Stock | Sale | -100% | $1,790,813 | $33.45 | -53,537 | 0 | 13 May 2026 | Direct |
| Jeffrey Emery | PRM | Common Stock | Options Exercise | 53,537 | 53,537 | 13 May 2026 | Direct | |||
| Jeffrey Emery | PRM | Stock Option (right to buy) | Options Exercise | -15.1% | -53,537 | 300,000 | 13 May 2026 | Direct | ||
| Kyle Sable | PRM | Common Stock | Sale | -100% | $952,500 | $31.75 | -30,000 | 0 | 12 May 2026 | Direct |
| Kyle Sable | PRM | Common Stock | Options Exercise | 30,000 | 30,000 | 12 May 2026 | Direct | |||
| Kyle Sable | PRM | Stock Option (right to buy) | Options Exercise | -20.1% | -30,000 | 119,540 | 12 May 2026 | Direct | ||
| Jeffrey Emery | PRM | Common Stock | Sale | -100% | $3,291,207 | $32.92 | -99,963 | 0 | 11 May 2026 | Direct |
| Jeffrey Emery | PRM | Common Stock | Options Exercise | 99,963 | 99,963 | 11 May 2026 | Direct | |||
| Jeffrey Emery | PRM | Stock Option (right to buy) | Options Exercise | -22% | -99,963 | 353,537 | 11 May 2026 | Direct | ||
| Kyle Sable | PRM | Common Stock | Sale | -100% | $672,929 | $32.89 | -20,460 | 0 | 11 May 2026 | Direct |
| Kyle Sable | PRM | Common Stock | Options Exercise | 20,460 | 20,460 | 11 May 2026 | Direct | |||
| Kyle Sable | PRM | Stock Option (right to buy) | Options Exercise | -12% | -20,460 | 149,540 | 11 May 2026 | Direct | ||
| Jeffrey Emery | PRM | Common Stock | Sale | -100% | $1,488,000 | $32.00 | -46,500 | 0 | 08 May 2026 | Direct |
| Jeffrey Emery | PRM | Common Stock | Options Exercise | 46,500 | 46,500 | 08 May 2026 | Direct | |||
| Jeffrey Emery | PRM | Stock Option (right to buy) | Options Exercise | -9.3% | -46,500 | 453,500 | 08 May 2026 | Direct | ||
| Kyle Sable | PRM | Common Stock | Sale | -100% | $4,728,000 | $31.52 | -150,000 | 0 | 08 May 2026 | Direct |
| Kyle Sable | PRM | Common Stock | Options Exercise | 150,000 | 150,000 | 08 May 2026 | Direct | |||
| Kyle Sable | PRM | Stock Option (right to buy) | Options Exercise | -100% | -150,000 | 0 | 08 May 2026 | Direct | ||
| W. Nicholas Howley | PRM | Common Stock | Gift | -85.2% | -3,480,640 | 606,200 | 23 Apr 2026 | Direct | ||
| W. Nicholas Howley | PRM | Common Stock | Gift | -19.7% | -1,000,000 | 4,086,840 | 01 Apr 2026 | Direct | ||
| William N. Thorndike Jr. | PRM | Common Stock | Sale | -1.16% | $2,318,000 | $23.18 | -100,000 | 8,535,656 | 11 Mar 2026 | Direct |
| William N. Thorndike Jr. | PRM | Common Stock | Sale | -1.14% | $2,363,000 | $23.63 | -100,000 | 8,635,656 | 10 Mar 2026 | Direct |
| William N. Thorndike Jr. | PRM | Common Stock | Sale | -1.41% | $2,920,921 | $23.37 | -125,000 | 8,735,656 | 09 Mar 2026 | Direct |
| William N. Thorndike Jr. | PRM | Common Stock | Sale | -1.12% | $2,363,000 | $23.63 | -100,000 | 8,860,656 | 06 Mar 2026 | Direct |
| William N. Thorndike Jr. | PRM | Common Stock | Sale | -1.1% | $2,406,000 | $24.06 | -100,000 | 8,960,656 | 05 Mar 2026 | Direct |
| William N. Thorndike Jr. | PRM | Common Stock | Sale | -1.36% | $3,032,500 | $24.26 | -125,000 | 9,060,656 | 04 Mar 2026 | Direct |
| Tracy Britt Cool | PRM | Common Stock | Award | 35.7% | 65,843 | 250,493 | 03 Mar 2026 | Direct | ||
| William N. Thorndike Jr. | PRM | Common Stock | Award | 154.9% | 5,582,492 | 9,185,656 | 03 Mar 2026 | Direct | ||
| Vivek Raj | PRM | Common Stock | Award | 456.7% | 555,859 | 677,560 | 03 Mar 2026 | Direct | ||
| W. Nicholas Howley | PRM | Common Stock | Gift | -17.8% | -1,101,852 | 5,086,840 | 03 Mar 2026 | Direct | ||
| W. Nicholas Howley | PRM | Common Stock | Award | 920.9% | 5,582,492 | 6,188,692 | 03 Mar 2026 | Direct | ||
| Haitham Khouri | PRM | Common Stock | Award | 317.6% | 1,600,317 | 2,104,150 | 03 Mar 2026 | Direct | ||
| Bernt G. Iversen II | PRM | Stock Option (right to buy) | Award | 35,682 | 23,333 | 26 Feb 2026 | Direct | |||
| Grant Bowman | PRM | Stock Option (right to buy) | Award | 232.3% | 139,820 | 200,000 | 26 Feb 2026 | Direct | ||
| Haitham Khouri | PRM | Stock Option (right to buy) | Award | 96.2% | 588,489 | 1,200,000 | 26 Feb 2026 | Direct | ||
| Jeffrey Emery | PRM | Stock Option (right to buy) | Award | 66.7% | 200,000 | 500,000 | 26 Feb 2026 | Direct | ||
| Kyle Sable | PRM | Stock Option (right to buy) | Award | 130.8% | 170,000 | 300,000 | 26 Feb 2026 | Direct | ||
| Noriko Yokozuka | PRM | Stock Option (right to buy) | Award | 50% | 120,000 | 360,000 | 26 Feb 2026 | Direct | ||
| Sean P. Hennessy | PRM | Stock Option (right to buy) | Award | 35,944 | 28,000 | 26 Feb 2026 | Direct | |||
| Robert S. Henderson | PRM | Stock Option (right to buy) | Award | 38,599 | 28,000 | 26 Feb 2026 | Direct | |||
| Tracy Britt Cool | PRM | Stock Option (right to buy) | Award | 28,944 | 28,000 | 26 Feb 2026 | Direct |
* marks a reported price that did not pass the local price check.