SEC Form 4 · Updated Daily
PESI
— PERMA-FIX ENVIRONMENTAL SERVICES, INC. OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| ZWECKER MARK A | Director | 247,606 | 2026-07-01 | A |
| REEDER JOE | Director | 239,345 | 2026-07-01 | A |
| CENTOFANTI LOUIS F | Director · Officer | 217,565 | 2025-11-17 | G |
| Shelton Larry | Director | 198,983 | 2026-07-13 | M |
| Grumski Joseph Timothy | Director | 67,661 | 2026-07-01 | A |
| Wamp Zach Paul | Director | 53,473 | 2026-07-01 | A |
| Bostick Thomas | Director | 50,610 | 2026-07-01 | A |
| Grondin Richard | Officer | 41,308 | 2026-01-20 | F |
| Duggan Kerry C | Director | 7,640 | 2026-07-01 | A |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-07-22 | Duggan Kerry C | Grant / award (derivative) | 10,000 | $0.00 | 10,000 |
| 2026-07-22 | Grumski Joseph Timothy | Grant / award (derivative) | 10,000 | $0.00 | 10,000 |
| 2026-07-22 | Bostick Thomas | Grant / award (derivative) | 10,000 | $0.00 | 10,000 |
| 2026-07-22 | ZWECKER MARK A | Grant / award (derivative) | 10,000 | $0.00 | 10,000 |
| 2026-07-22 | Shelton Larry | Grant / award (derivative) | 10,000 | $0.00 | 10,000 |
| 2026-07-22 | Wamp Zach Paul | Grant / award (derivative) | 10,000 | $0.00 | 10,000 |
| 2026-07-22 | REEDER JOE | Grant / award (derivative) | 10,000 | $0.00 | 10,000 |
| 2026-07-13 | Shelton Larry | Option exercise (derivative) | 2,400 | $0.00 | 0 |
| 2026-07-13 | Shelton Larry | Option exercise | 2,400 | $4.60 | 198,983 |
| 2026-07-01 | Duggan Kerry C | Grant / award | 819 | $10.72 | 7,640 |
| 2026-07-01 | Shelton Larry | Grant / award | 1,365 | $10.72 | 196,583 |
| 2026-07-01 | Wamp Zach Paul | Grant / award | 849 | $10.72 | 53,473 |
| 2026-07-01 | REEDER JOE | Grant / award | 1,458 | $10.72 | 239,345 |
| 2026-07-01 | Bostick Thomas | Grant / award | 1,213 | $10.72 | 50,610 |
| 2026-07-01 | ZWECKER MARK A | Grant / award | 1,167 | $10.72 | 247,606 |
| 2026-07-01 | Grumski Joseph Timothy | Grant / award | 1,528 | $10.72 | 67,661 |
| 2026-04-01 | Shelton Larry | Grant / award | 1,824 | $8.02 | 195,218 |
| 2026-04-01 | Wamp Zach Paul | Grant / award | 1,094 | $8.02 | 52,624 |
| 2026-04-01 | Bostick Thomas | Grant / award | 1,559 | $8.02 | 49,397 |
| 2026-04-01 | Grumski Joseph Timothy | Grant / award | 2,105 | $8.02 | 66,133 |
| 2026-04-01 | Duggan Kerry C | Grant / award | 1,054 | $8.02 | 6,821 |
| 2026-04-01 | REEDER JOE | Grant / award | 1,886 | $8.02 | 237,887 |
| 2026-04-01 | ZWECKER MARK A | Grant / award | 1,520 | $8.02 | 244,039 |
| 2026-01-20 | Grondin Richard | Option exercise (derivative) | 6,000 | $0.00 | 12,000 |
| 2026-01-20 | Grondin Richard | Option exercise (derivative) | 5,000 | $0.00 | 5,000 |
| 2026-01-20 | Grondin Richard | Tax withholding | 1,729 | $13.71 | 41,308 |
| 2026-01-20 | Grondin Richard | Option exercise | 6,000 | $3.95 | 43,037 |
| 2026-01-20 | Grondin Richard | Tax withholding | 2,555 | $13.71 | 37,037 |
| 2026-01-20 | Grondin Richard | Option exercise | 5,000 | $7.00 | 39,592 |
| 2026-01-02 | ZWECKER MARK A | Grant / award | 1,325 | $9.44 | 242,519 |
| 2026-01-02 | Shelton Larry | Grant / award | 1,583 | $9.44 | 193,394 |
| 2026-01-02 | Duggan Kerry C | Grant / award | 929 | $9.44 | 5,767 |
| 2026-01-02 | Grumski Joseph Timothy | Grant / award | 1,840 | $9.44 | 64,028 |
| 2026-01-02 | Wamp Zach Paul | Grant / award | 964 | $9.44 | 51,530 |
| 2026-01-02 | Bostick Thomas | Grant / award | 1,324 | $9.44 | 47,838 |
| 2026-01-02 | REEDER JOE | Grant / award | 1,549 | $9.44 | 236,001 |
| 2025-12-15 | REEDER JOE | Gift | 364 | $0.00 | 234,452 |
| 2025-12-15 | REEDER JOE | Gift | 727 | $0.00 | 234,816 |
| 2025-12-15 | REEDER JOE | Gift | 727 | $0.00 | 235,543 |
| 2025-12-15 | REEDER JOE | Gift | 1,090 | $0.00 | 236,270 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.