Who owns PERMA FIX ENVIRONMENTAL SERVICES INC?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of PESI from SEC Form 13F filings across 88 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 88 institutions disclosed 9.5M shares of PERMA FIX ENVIRONMENTAL SERVICES INC worth $135.2M — about 47.7% of shares outstanding; the largest disclosed holder is BlackRock, Inc.. Source: SEC Form 13F filings, parsed by EvidInvest.
88
13F holders
$135.2M
value, 2026 filers
47.7%
of shares outstanding (9.5M sh)
14
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of PESI's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 1.3M | $17.9M | 0.0% | 6.3% | +7.0% |
| 2 | MAK CAPITAL ONE LLC | 1.0M | $14.8M | 2.1% | 5.2% | +12.4% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 811,743 | $11.6M | 0.0% | 4.1% | +6.9% |
| 4 | Prescott Group Capital Management, L.L.C. | 777,142 | $11.1M | 1.0% | 3.9% | 0.0% |
| 5 | Diamond Hill Capital Management, LLC (Investment Advisor) | 642,533 | $9.2M | 0.1% | 3.2% | +80.5% |
| 6 | KENNEDY CAPITAL MANAGEMENT LLCNEW | 610,903 | $8.7M | 0.2% | 3.1% | new |
| 7 | Potomac Capital Management, Inc. | 477,000 | $6.8M | 4.7% | 2.4% | +60.8% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 455,156 | $6.5M | 0.0% | 2.3% | +5.2% |
| 9 | HEARTLAND ADVISORS INC | 400,000 | $5.7M | 0.3% | 2% | 0.0% |
| 10 | STATE STREET CORP | 349,744 | $5.0M | 0.0% | 1.8% | +4.2% |
| 11 | DIMENSIONAL FUND ADVISORS LP | 191,063 | $2.7M | 0.0% | 1% | +16.7% |
| 12 | GOLDMAN SACHS GROUP INC | 162,755 | $2.3M | 0.0% | 0.8% | +14.1% |
| 13 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 156,934 | $2.2M | 0.0% | 0.8% | +1314.1% |
| 14 | CITADEL ADVISORS LLC | 152,626 | $2.2M | 0.0% | 0.8% | +120.2% |
| 15 | NORTHERN TRUST CORP | 141,639 | $2.0M | 0.0% | 0.7% | +9.3% |
| 16 | VANGUARD FIDUCIARY TRUST CO | 123,040 | $1.8M | 0.0% | 0.6% | +3.2% |
| 17 | GROUP ONE TRADING LLC | 122,611 | $1.8M | 0.0% | 0.6% | -50.5% |
| 18 | VANGUARD PORTFOLIO MANAGEMENT LLC | 121,267 | $1.7M | 0.0% | 0.6% | +20.9% |
| 19 | North Star Investment Management Corp. | 120,532 | $1.7M | 0.1% | 0.6% | 0.0% |
| 20 | Diametric Capital, LPNEW | 114,714 | $1.6M | 0.2% | 0.6% | new |
| 21 | MYDA Advisors LLC | 90,000 | $1.3M | 0.2% | 0.5% | -25.0% |
| 22 | CM WEALTH ADVISORS LLCNEW | 87,839 | $1.3M | 0.2% | 0.4% | new |
| 23 | XTX Topco Ltd | 62,888 | $898,670 | 0.0% | 0.3% | +170.8% |
| 24 | Owls Nest Partners IA, LLCNEW | 56,555 | $808,171 | 0.3% | 0.3% | new |
| 25 | Pale Fire Capital SE | 55,627 | $794,910 | 0.1% | 0.3% | +14.4% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.