Perma Fix Environmental Services's top three insider shareholders as of March 23, 2026 are Mark A Zwecker (Director, 242.52K shares), Joe Reeder (Director, 236.00K shares), Louis F Centofanti (Evp Of Strategic Initiatives, 218.76K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Mark A Zwecker | 242,519 | 0 | 05 Jan, 2026 | |
| Joe Reeder | 236,001 | 0 | 06 Jan, 2026 | |
| Louis F Centofanti | Evp Of Strategic Initiatives | 218,765 | 0 | 18 Mar, 2025 |
| Larry Shelton | 193,394 | 0 | 05 Jan, 2026 | |
| Mark Duff | President And Ceo | 134,556 | 0 | 12 Sep, 2025 |
| Joseph Timothy Grumski | 64,028 | 0 | 05 Jan, 2026 | |
| Zach Paul Wamp | 51,530 | 0 | 05 Jan, 2026 | |
| Ben Naccarato | Chief Financial Officer | 48,811 | 0 | 24 Mar, 2025 |
| Thomas Bostick | 47,838 | 0 | 05 Jan, 2026 | |
| Richard Grondin | Evp Of Hanford Int. Waste Op | 41,308 | 0 | 21 Jan, 2026 |
| Andy Lombardo | Evp Of Nuclear Technical Svc | 17,448 | 0 | 06 Dec, 2023 |
| Kerry C Duggan | 5,767 | 0 | 05 Jan, 2026 | |
| Troy Eshleman | Chief Operating Officer | 1,350 | 0 | 19 Mar, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 20 Jan, 2026 | Richard Grondin | Common Stock | A | 5,000 | $7.01 | 39,592 | D | M |
| 20 Jan, 2026 | Richard Grondin | Common Stock | D | 2,555 | $13.71 | 37,037 | D | F |
| 20 Jan, 2026 | Richard Grondin | Common Stock | A | 6,000 | $3.95 | 43,037 | D | M |
| 20 Jan, 2026 | Richard Grondin | Common Stock | D | 1,729 | $13.71 | 41,308 | D | F |
| 20 Jan, 2026 | Richard Grondin | Stock Option | D | 5,000 | $0.00 | 5,000 | D | M |
| 20 Jan, 2026 | Richard Grondin | Stock Option | D | 6,000 | $0.00 | 12,000 | D | M |
| 02 Jan, 2026 | Joe Reeder | Common Stock | A | 1,549 | $9.44 | 236,001 | D | A |
| 02 Jan, 2026 | Kerry C Duggan | Common Stock | A | 929 | $9.44 | 5,767 | D | A |
| 02 Jan, 2026 | Mark A Zwecker | Common Stock | A | 1,325 | $9.44 | 242,519 | D | A |
| 02 Jan, 2026 | Thomas Bostick | Common Stock | A | 1,324 | $9.44 | 47,838 | D | A |
| 02 Jan, 2026 | Larry Shelton | Common Stock | A | 1,583 | $9.44 | 193,394 | D | A |
| 02 Jan, 2026 | Zach Paul Wamp | Common Stock | A | 964 | $9.44 | 51,530 | D | A |
| 02 Jan, 2026 | Joseph Timothy Grumski | Common Stock | A | 1,840 | $9.44 | 64,028 | D | A |
| 15 Dec, 2025 | Joe Reeder | Common Stock | D | 11,048 | $0.00 | 237,360 | D | G |
| 15 Dec, 2025 | Joe Reeder | Common Stock | D | 1,090 | $0.00 | 236,270 | D | G |
| 15 Dec, 2025 | Joe Reeder | Common Stock | D | 727 | $0.00 | 235,543 | D | G |
| 15 Dec, 2025 | Joe Reeder | Common Stock | D | 727 | $0.00 | 234,816 | D | G |
| 15 Dec, 2025 | Joe Reeder | Common Stock | D | 364 | $0.00 | 234,452 | D | G |
| 01 Oct, 2025 | Joe Reeder | Common Stock | A | 2,063 | $7.58 | 248,408 | D | A |
| 01 Oct, 2025 | Mark A Zwecker | Common Stock | A | 1,609 | $7.58 | 241,194 | D | A |