PESI Perma-Fix Environmental Services, Inc.
Perma-Fix Environmental Services, Inc. (PESI) Institutional Ownership
What the institutions did with PESI last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeLargest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 1.3M | 13.2% |
| MAK CAPITAL ONE LLC | 1.0M | 10.9% |
| VANGUARD CAPITAL MANAGEMENT LLC | 811.7K | 8.6% |
| Prescott Group Capital Management, L.L.C. | 777.1K | 8.2% |
| DIAMOND HILL CAPITAL MANAGEMENT INC | 642.5K | 6.8% |
| KENNEDY CAPITAL MANAGEMENT LLC | 610.9K | 6.5% |
| Potomac Capital Management, Inc. | 477.0K | 5.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 455.2K | 4.8% |
| HEARTLAND ADVISORS INC | 400.0K | 4.2% |
| STATE STREET CORP | 349.7K | 3.7% |
| DIMENSIONAL FUND ADVISORS LP | 191.1K | 2.0% |
| GOLDMAN SACHS GROUP INC | 162.8K | 1.7% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 156.9K | 1.7% |
| CITADEL ADVISORS LLC | 152.6K | 1.6% |
| NORTHERN TRUST CORP | 141.6K | 1.5% |
| VANGUARD FIDUCIARY TRUST CO | 123.0K | 1.3% |
| GROUP ONE TRADING LLC | 122.6K | 1.3% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 121.3K | 1.3% |
| North Star Investment Management Corp. | 120.5K | 1.3% |
| Diametric Capital, LP | 114.7K | 1.2% |
| MYDA Advisors LLC | 90.0K | 1.0% |
| CM WEALTH ADVISORS LLC | 87.8K | 0.9% |
| XTX Topco Ltd | 62.9K | 0.7% |
| Owls Nest Partners IA, LLC | 56.6K | 0.6% |
| Pale Fire Capital SE | 55.6K | 0.6% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| KENNEDY CAPITAL MANAGEMENT LLC | New | 0 | 610.9K | +610.9K |
| DIAMOND HILL CAPITAL MANAGEMENT INC | Increased | 356.0K | 642.5K | +286.6K |
| Potomac Capital Management, Inc. | Increased | 296.7K | 477.0K | +180.3K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 11.1K | 156.9K | +145.8K |
| GROUP ONE TRADING LLC | Reduced | 247.7K | 122.6K | -125.1K |
| Diametric Capital, LP | New | 0 | 114.7K | +114.7K |
| MAK CAPITAL ONE LLC | Increased | 918.7K | 1.0M | +114.3K |
| CM WEALTH ADVISORS LLC | New | 0 | 87.8K | +87.8K |
| CITADEL ADVISORS LLC | Increased | 69.3K | 152.6K | +83.3K |
| BlackRock, Inc. | Increased | 1.2M | 1.3M | +82.5K |
| Owls Nest Partners IA, LLC | New | 0 | 56.6K | +56.6K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 759.4K | 811.7K | +52.3K |
| SEI INVESTMENTS CO | New | 0 | 41.0K | +41.0K |
| XTX Topco Ltd | Increased | 23.2K | 62.9K | +39.7K |
| D. E. Shaw & Co., Inc. | Reduced | 63.0K | 24.9K | -38.1K |
| ALLIANCEBERNSTEIN L.P. | New | 0 | 32.9K | +32.9K |
| UBS Group AG | Reduced | 62.1K | 31.5K | -30.6K |
| MYDA Advisors LLC | Reduced | 120.0K | 90.0K | -30.0K |
| DIMENSIONAL FUND ADVISORS LP | Increased | 163.8K | 191.1K | +27.3K |
| MORGAN STANLEY | Increased | 26.7K | 53.1K | +26.4K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 432.7K | 455.2K | +22.5K |
| Trexquant Investment LP | New | 0 | 21.9K | +21.9K |
| Squarepoint Ops LLC | Reduced | 51.9K | 31.0K | -21.0K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 100.3K | 121.3K | +20.9K |
| GOLDMAN SACHS GROUP INC | Increased | 142.7K | 162.8K | +20.1K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.