Perimeter Solutions, Inc.
Perimeter Solutions, Inc. (PRM) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · PRM · as of Sep 30, 2025
Ownership Breakdown
244
Institutional Holders
▲ 31 vs Q2
$4.02B
Total Inst. Value
▲ $2.24B vs Q2
163.13M
Shares Outstanding
freeFloat 91.29%
127.05M
13F Shares Held
▼ 1.38M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
PRM largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
WINDACRE PARTNERSHIP LLC chemicals & allied products | 21.85M | 14.86% | 14.86% | $489.32B | Nov 14, 2025 | — held |
PRINCIPAL FINANCIAL GROUP INC chemicals & allied products | 11.01M | 7.49% | 7.49% | $246.58B | Nov 4, 2025 | ▲ 57.2K |
BLACKROCK, INC. chemicals & allied products | 10.65M | 7.24% | 7.24% | $238.35B | Nov 12, 2025 | ▼ 219.6K |
FMR LLC chemicals & allied products | 9.76M | 6.63% | 6.63% | $218.42B | Nov 13, 2025 | ▲ 6.71M |
VANGUARD GROUP INC chemicals & allied products | 8.41M | 5.72% | 5.72% | $188.39B | Nov 7, 2025 | ▼ 124.5K |
DIMENSIONAL FUND ADVISORS LP chemicals & allied products | 5.15M | 3.50% | 3.50% | $115.19B | Nov 12, 2025 | ▲ 221.3K |
GEODE CAPITAL MANAGEMENT, LLC chemicals & allied products | 3.30M | 2.24% | 2.24% | $73.88B | Nov 12, 2025 | ▲ 7.1K |
STATE STREET CORP chemicals & allied products | 3.14M | 2.14% | 2.14% | $70.33B | Nov 14, 2025 | ▼ 93.4K |
JPMORGAN CHASE & CO chemicals & allied products | 3.13M | 2.13% | 2.13% | $70.16B | Nov 26, 2025 | ▼ 2.05M |
BROWN BROTHERS HARRIMAN & CO chemicals & allied products | 2.77M | 1.88% | 1.88% | $61.97B | Nov 13, 2025 | ▼ 627.7K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
22
Increased
+10.11M shares2
New Positions
first time holders24
Decreased
−9.05M shares0
Sold Out
fully exitedNet shares change (top 50)
+1.06M
+10.11M / −9.05M
Net new holders
+0
2 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
PRM insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
8
Buy transactions
22
Sell transactions
0.36
Buy/Sell ratio
$6M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Khouri Haitham Chief Executive Officer | May 20, 2026 | Sale | 20,300 | $34.09 | $692.0K | 2.08M | Form 4 ↗ |
Khouri Haitham Chief Executive Officer | May 21, 2026 | Sale | 91,724 | $31.91 | $2.93M | 1.99M | Form 4 ↗ |
Khouri Haitham Chief Executive Officer | May 22, 2026 | Sale | 117,511 | $31.19 | $3.67M | 1.87M | Form 4 ↗ |
Sable Kyle Chief Financial Officer | May 13, 2026 | Sale | 46,263 | $33.05 | $1.53M | 3.3K | Form 4 ↗ |
Sable Kyle Chief Financial Officer | May 13, 2026 | Sale | 3,277 | $33.59 | $110.1K | 0 | Form 4 ↗ |
Emery Jeffrey President - Global Fire Safety | May 13, 2026 | Sale | 53,537 | $33.45 | $1.79M | 0 | Form 4 ↗ |
Emery Jeffrey President - Global Fire Safety | May 11, 2026 | Sale | 97,855 | $32.90 | $3.22M | 2.1K | Form 4 ↗ |
Emery Jeffrey President - Global Fire Safety | May 11, 2026 | Sale | 2,108 | $34.05 | $71.8K | 0 | Form 4 ↗ |
Emery Jeffrey President - Global Fire Safety | May 8, 2026 | Sale | 46,500 | $32.00 | $1.49M | 0 | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Perimeter Solutions, Inc. (PRM) is primarily owned by institutional investors, who hold approximately 77.9% of total shares outstanding. Company insiders own approximately 8.71%, while retail and public investors account for the remaining 13.40%.
The largest institutional shareholder of Perimeter Solutions, Inc. is WINDACRE PARTNERSHIP LLC, holding approximately 21.85 million shares — equal to 14.86% of outstanding shares — as of September 30, 2025.
A total of 244 institutional investors currently hold PRM stock, with a combined institutional value of approximately $4.02 billion as of the most recent 13F filing period.
Frequently asked questions
PRM ownershipPerimeter Solutions, Inc. (PRM) is primarily owned by institutional investors, who hold approximately 77.9% of shares. The largest shareholder is WINDACRE PARTNERSHIP LLC with a 14.86% stake. Company insiders hold 8.71%. Data sourced from SEC Form 13F as of September 30, 2025.