As of June 09, 2026, the three largest insider holders of PESI are Mark A Zwecker (Director, 244.04K shares), Louis F Centofanti (Evp Of Strategic Initiatives, 218.76K shares), Larry Shelton (Director, 195.22K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Louis F Centofanti | Evp Of Strategic Initiatives | 218,765 | 0 | 18 Mar, 2025 |
| Mark A Zwecker | - | 244,039 | 0 | 02 Apr, 2026 |
| Larry Shelton | - | 195,218 | 0 | 02 Apr, 2026 |
| Ben Naccarato | Chief Financial Officer | 48,811 | 0 | 24 Mar, 2025 |
| Mark Duff | President And Ceo | 134,556 | 0 | 12 Sep, 2025 |
| Thomas Bostick | - | 49,397 | 0 | 02 Apr, 2026 |
| Zach Paul Wamp | - | 52,624 | 0 | 02 Apr, 2026 |
| Andy Lombardo | Evp Of Nuclear Technical Svc | 17,448 | 0 | 06 Dec, 2023 |
| Joseph Timothy Grumski | - | 66,133 | 0 | 02 Apr, 2026 |
| Richard Grondin | Evp Of Hanford Int. Waste Op | 41,308 | 0 | 21 Jan, 2026 |
| Kerry C Duggan | - | 6,821 | 0 | 02 Apr, 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 |
|---|---|---|---|---|---|---|---|---|
| 01 Apr, 2026 | Joseph Timothy Grumski | Common Stock | A | 2,105 | $8.02 | 66,133 | D | A |
| 01 Apr, 2026 | Larry Shelton | Common Stock | A | 1,824 | $8.02 | 195,218 | D | A |
| 01 Apr, 2026 | Thomas Bostick | Common Stock | A | 1,559 | $8.02 | 49,397 | D | A |
| 01 Apr, 2026 | Mark A Zwecker | Common Stock | A | 1,520 | $8.02 | 244,039 | D | A |
| 01 Apr, 2026 | Kerry C Duggan | Common Stock | A | 1,054 | $8.02 | 6,821 | D | A |
| 01 Apr, 2026 | Mark A Zwecker | Common Stock | A | 1,520 | $8.02 | 244,039 | D | A |
| 01 Apr, 2026 | Larry Shelton | Common Stock | A | 1,824 | $8.02 | 195,218 | D | A |
| 01 Apr, 2026 | Zach Paul Wamp | Common Stock | A | 1,094 | $8.02 | 52,624 | D | A |
| 01 Apr, 2026 | Zach Paul Wamp | Common Stock | A | 1,094 | $8.02 | 52,624 | D | A |
| 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 | Zach Paul Wamp | Common Stock | A | 964 | $9.44 | 51,530 | D | A |
| 02 Jan, 2026 | Mark A Zwecker | Common Stock | A | 1,325 | $9.44 | 242,519 | 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 |