Based on data from the past 90 days ending February 19, 2026, Perma Fix Environmental Services's three largest insider shareholders are Director Mark A Zwecker (242.52K shares), Director Joe Reeder (236.00K shares), Evp Of Strategic Initiatives Louis F Centofanti (218.76K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Mark A Zwecker | 242,519 | 05 Jan, 2026 | |
| Joe Reeder | 236,001 | 06 Jan, 2026 | |
| Louis F Centofanti | Evp Of Strategic Initiatives | 218,765 | 18 Mar, 2025 |
| Larry Shelton | 193,394 | 05 Jan, 2026 | |
| Mark Duff | President And Ceo | 134,556 | 12 Sep, 2025 |
| Joseph Timothy Grumski | 64,028 | 05 Jan, 2026 | |
| Zach Paul Wamp | 51,530 | 05 Jan, 2026 | |
| Ben Naccarato | Chief Financial Officer | 48,811 | 24 Mar, 2025 |
| Thomas Bostick | 47,838 | 05 Jan, 2026 | |
| Richard Grondin | Evp Of Hanford & Int. Waste Op | 41,308 | 21 Jan, 2026 |
| Andy Lombardo | Evp Of Nuclear & Technical Svc | 17,448 | 06 Dec, 2023 |
| Kerry C Duggan | 5,767 | 05 Jan, 2026 | |
| Troy Eshleman | Chief Operating Officer | 1,350 | 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 | $7.00 | 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 | D | 1,729 | $13.71 | 41,308 | D | F |
| 20 Jan, 2026 | Richard Grondin | Common Stock | A | 6,000 | $3.95 | 43,037 | D | M |
| 02 Jan, 2026 | Mark A Zwecker | Common Stock | A | 1,325 | $9.44 | 242,519 | D | A |
| 02 Jan, 2026 | Joe Reeder | Common Stock | A | 1,549 | $9.44 | 236,001 | D | A |
| 02 Jan, 2026 | Larry Shelton | Common Stock | A | 1,583 | $9.44 | 193,394 | D | A |
| 02 Jan, 2026 | Thomas Bostick | Common Stock | A | 1,324 | $9.44 | 47,838 | 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 |
| 02 Jan, 2026 | Kerry C Duggan | Common Stock | A | 929 | $9.44 | 5,767 | D | A |
| 15 Dec, 2025 | Joe Reeder | Common Stock | D | 727 | $0.00 | 235,543 | D | G |
| 15 Dec, 2025 | Joe Reeder | Common Stock | D | 11,048 | $0.00 | 237,360 | D | G |
| 15 Dec, 2025 | Joe Reeder | Common Stock | D | 364 | $0.00 | 234,452 | 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 | 234,816 | D | G |
| 01 Oct, 2025 | Mark A Zwecker | Common Stock | A | 1,609 | $7.58 | 241,194 | D | A |
| 01 Oct, 2025 | Joe Reeder | Common Stock | A | 2,063 | $7.58 | 248,408 | D | A |
| 01 Oct, 2025 | Larry Shelton | Common Stock | A | 1,931 | $7.58 | 191,811 | D | A |
| 01 Oct, 2025 | Thomas Bostick | Common Stock | A | 1,716 | $7.58 | 46,514 | D | A |