As of November 6, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of Perimeter Solutions, Inc. The largest reported stake is The WindAcre Partnership LLC's, at 9.9%. 5 filings are on record since November 5, 2025 (Schedule 13G/A, August 14, 2026).
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Key facts
- · Reporting person: The WindAcre Partnership LLC · Sole voting: 0 · Shared voting: 16,148,621 · Sole dispositive: 0 · Shared dispositive: 16,148,621 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: Principal Global Investors · Sole voting: 0 · Shared voting: 13,375,024 · Sole dispositive: 0 · Shared dispositive: 13,375,024 · SCHEDULE 13G/A, 2026-08-05
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
- · Holder: William N. Thorndike, Jr. · Percent: 5.7% · SCHEDULE 13D
- · Holder: Fmr LLC · Percent: 6.7% · SCHEDULE 13G
Perimeter Solutions, Inc. has 5 Schedule 13D or 13G filings on record since 2025-11-05. 4 holders' latest filing reports 5% or more of common stock, par value $0.0001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| The WindAcre Partnership LLC | 9.9% | 16,148,621 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| Principal Global Investors | 8.2% | 13,375,024 | SCHEDULE 13G/A, 2026-08-05 | 2026-06-30 |
| Fmr LLC | 6.7% | 9,755,144 | SCHEDULE 13G, 2025-11-05 | 2025-09-30 |
| William N. Thorndike, Jr. | 5.7% | 9,309,341 | SCHEDULE 13D, 2026-03-10 | 2026-03-03 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
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More on Perimeter Solutions, Inc. and the records around it.
Perimeter Solutions, Inc. elsewhere on the record
Companies that share a holder
- PRINCIPAL GLOBAL INVESTORS also filed stake reports on 19 other companies: Brookfield Infrastructure Partners L.P. (Oct 2026), COLLEGIUM PHARMACEUTICAL, INC (Oct 2026), Hyatt Hotels Corp (Oct 2026)
- FMR LLC also filed stake reports on 761 other companies: ASPEN NEUROSCIENCE INC (Nov 2026), AVALO THERAPEUTICS INC (Nov 2026), BRAZE INC (Nov 2026)
- The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)
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What the Full Report on Perimeter Solutions, Inc. covers
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| The WindAcre Partnership LLC | 0 | 16,148,621 | 0 | 16,148,621 | SCHEDULE 13G/A, 2026-08-14 |
| The WindAcre Partnership Master Fund, LP | 0 | 16,148,621 | 0 | 16,148,621 | SCHEDULE 13G/A, 2026-08-14 |
| Snehal Rajnikant Amin | 0 | 16,148,621 | 0 | 16,148,621 | SCHEDULE 13G/A, 2026-08-14 |
| Principal Global Investors | 0 | 13,375,024 | 0 | 13,375,024 | SCHEDULE 13G/A, 2026-08-05 |
| Principal Funds, Inc. | 0 | 9,151,796 | 0 | 9,151,796 | SCHEDULE 13G/A, 2026-08-05 |
The latest filing identifies Perimeter Solutions, Inc. by CUSIP 71385M107 and gives its principal executive office as 8000 Maryland Avenue, Suite 350, Clayton, MO 63105 (SCHEDULE 13G/A, 2026-08-14).
Purpose of Transaction (Item 4)
William N. Thorndike, Jr.
The Reporting Person acquired the securities of the Issuer for investment purposes. The information contained in Item 3 and in Item 6 of this Schedule 13D is incorporated herein by reference. The Reporting Person or his affiliates may purchase additional securities or dispose of securities of the Issuer in varying amounts and at varying times depending upon the Reporting Person's continuing assessments of pertinent factors, including the availability of shares of Common Stock or other securities for purchase at particular price levels, the business prospects of the Issuer, other business investment opportunities, economic conditions, stock market conditions, money market conditions, the attitudes and actions of the board of directors of the Issuer (the "Board") and management of the Issuer, the availability and nature of opportunities to dispose of shares of the Issuer and other plans and requirements of the Reporting Person. The Reporting Person may enter into derivative securities or similar instruments that derive their value with reference to securities of the Issuer, including hedging transactions with respect to some or all of the shares of Common Stock of the Issuer beneficially owned by the Reporting Person. The Reporting Person may discuss items of mutual interest with the Issuer, which could include items in subparagraphs (a) through (j) of Item 4 of Schedule 13D. The Reporting Person intends to review his investment in the Issuer on an ongoing basis and, in the …The first part of Item 4 of the SCHEDULE 13D filed 2026-03-10; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-11-05 | Fmr LLC | 6.7% | SCHEDULE 13G |
| 2026-03-10 | William N. Thorndike, Jr. | 5.7% | SCHEDULE 13D |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-08-05 | Principal Global Investors | 8.2% | SCHEDULE 13G/A |
| 2026-08-14 | The WindAcre Partnership LLC | 9.9% | SCHEDULE 13G/A |
Questions about who owns Perimeter Solutions, Inc.
Who owns Perimeter Solutions, Inc.?
On this page, 4 holders' latest ownership filings report 5% or more of Perimeter Solutions, Inc.: The WindAcre Partnership LLC (9.9%, Schedule 13G/A, filed 2026-08-14), Principal Global Investors (8.2%, Schedule 13G/A, filed 2026-08-05), Fmr LLC (6.7%, Schedule 13G, filed 2025-11-05) and William N. Thorndike, Jr. (5.7%, Schedule 13D, filed 2026-03-10).
Who are the largest shareholders of Perimeter Solutions, Inc.?
By the share each holder's latest filing reports, the largest holders of Perimeter Solutions, Inc. on this page are The WindAcre Partnership LLC (9.9%), Principal Global Investors (8.2%) and Fmr LLC (6.7%).
When did The WindAcre Partnership LLC buy into Perimeter Solutions, Inc.?
The filings give report dates, not purchase dates. The earliest filing from The WindAcre Partnership LLC on this page is the Schedule 13G/A, filed 2026-08-14, reporting 9.9%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 5 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.