| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
President and CEO | Executive Vice President/ COO
1 company
Mark Duff last filed a Form 4 in September 2025, as President and CEO at PESI. Mark Duff's net worth is not public. Form 4 filings only show shares in the companies where this person was an insider, as of the last filing.
Historically, Mark Duff's trades have earned a strong insider score of 77/100 across 12 rated trades. Over a 12-month horizon, 83.3% of those trades were profitable, with an average 12-month return of +53.2%.
At the last filing, the largest reported position was 134,556 shares of PESI. Net of sales, the PESI filings show accumulation of 33,505 shares.
Mark Duff has 28 Form 4 filings on record from March 2017 to September 2025, all as President and CEO at Perma Fix Environmental Services (PESI), 2017–2025.
The 58 reported transactions were 48 open-market purchases, 4 option or other derivative awards, 3 option exercises and 3 tax withholdings.
Counted by filing, the open-market trades come to 21 purchases worth about $177K and no sales.
The largest open-market purchase was 3,000 shares of PESI at an average $7.16 on December 1, 2023, about $21K. Twelve months later PESI was up 101%.
Shares as reported in the last Form 4 for each company; the most recent is from September 2025. Values use today's prices. Any trades after the last filing were not reported, so current holdings may differ.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Sep 11, 2025 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 897 | $8.05 | $7,220.85 | +0.7% | +74.1% | +129.2% | |
| Mar 21, 2025 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 2,050 | $7.03 | $14,417.00 | +1.6% | +43.5% | +69.5% | |
| Mar 18, 2025 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 1,000 | $7.15 | $7,150.00 | +0.8% | +39.5% | +68.3% | |
| Sep 4, 2024 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 2,100 | $10.11 | $21,230.00 | +1.9% | +30.8% | +20.6% | |
| Dec 1, 2023 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 3,000 | $7.16 | $21,465.00 | +2.8% | +11.8% | +101.4% | |
| Nov 22, 2022 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 1,000 | $3.89 | $3,890.00 | +2.5% | +73.8% | +106.2% | |
| Sep 7, 2022 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 1,500 | $4.75 | $7,130.00 | +3.9% | -27.0% | +145.5% | |
| May 12, 2022 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 2,000 | $5.55 | $11,100.00 | +5.5% | +1.8% | +84.9% | |
| Dec 20, 2021 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 1,637 | $6.54 | $10,711.24 | +8.9% | -13.2% | -48.0% | |
| Dec 29, 2020 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 500 | $5.85 | $2,925.00 | +2.8% | - | - |