Perma-Fix Environmental Services
Treats radioactive and mixed waste while delivering nuclear field services.
$18.12
After-hours close−0.01 (−0.06%)
At close$18.13(−6.06%)
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Breakdown13F · Form 4
Institutions 44.89%9.52M sharesInsiders 6.16%1.31M sharesOther 48.95%10.38M shares
Shares outstanding 21.20M · Float 17.36M · 81.9% free float
Institutions13F, as of Jun 30, 2026
94 holders · 9.52M shares · 17 new positions · 49 increased · 19 reduced · 11 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 1.25M | 5.91% | +82.5K | Aug 7, 2026 |
| Mak Capital One LLC | 1.03M | 4.87% | +114.3K | Aug 14, 2026 |
| Vanguard Capital Management LLC | 811.7K | 3.83% | +52.3K | Aug 13, 2026 |
| Prescott Group Capital Management, L.L.C. | 777.1K | 3.67% | 0 | Aug 7, 2026 |
| Diamond Hill Capital Management Inc | 642.5K | 3.03% | +286.6K | Aug 6, 2026 |
| Kennedy Capital Management LLC | 610.9K | 2.88% | +610.9Knew | Aug 14, 2026 |
| Potomac Capital Management, Inc. | 477.0K | 2.25% | +180.3K | Aug 14, 2026 |
| Geode Capital Management, LLC | 455.2K | 2.15% | +22.5K | Aug 12, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 6.40% | 1.01M | Nov 8, 2024 ↗ | |
| MAK Capital Fund LP | 5.50% | 1.16M | 13G | Aug 6, 2026 ↗ |
| HOLD Alapkezelo Zrt. | 5.10% | 944.3K | 13G | Mar 30, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Mark A. Zwecker | director | 247.6K | 1.17% | Jul 2, 2026 |
| Joe Reeder | director | 239.3K | 1.13% | Jul 2, 2026 |
| Louis F. Centofanti | director, officer: EVP of Strategic Initiatives | 218.2K | 1.03% | Feb 10, 2026 |
| Larry Shelton | director | 199.0K | 0.94% | Jul 14, 2026 |
| Mark Duff | director, officer: President and CEO | 134.6K | 0.63% | Sep 12, 2025 |
| Joseph Timothy Grumski | director | 67.7K | 0.32% | Jul 2, 2026 |
| Zach Paul Wamp | director | 53.5K | 0.25% | Jul 2, 2026 |
| Thomas Bostick | director | 50.6K | 0.24% | Jul 2, 2026 |
| Ben Naccarato | officer: Chief Financial Officer | 48.8K | 0.23% | Mar 24, 2025 |
| Richard Grondin | officer: EVP of Hanford & Int. Waste Op | 37.0K | 0.17% | Jan 21, 2026 |
2 ten-percent owners hold 235.9K shares by Form 4, outside the officers-and-directors figure above · 15 people have not refiled in the last 18 months (518.6K shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Sep 16, 2025 | Kerry C. Duggandirector | Sale | 5,653 | $8.60 | 3,680 |
| Sep 11, 2025 | Larry Sheltondirector | Purchase | 1,000 | $8.58 | 189,880 |
| Sep 11, 2025 | Mark Duffdirector, officer: President and CEO | Purchase | 897 | $8.05 | 134,556 |
| Sep 9, 2025 | Larry Sheltondirector | Purchase | 1,000 | $9.61 | 188,880 |
CongressHouse and Senate disclosures
Not reported.