| 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. From March 2017 to September 2025, the filings on record show 21 open-market purchases and 0 sales. 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.
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% | SEC |
|---|---|---|---|---|---|---|---|---|
| Nov 9, 2020 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 500 | $6.20 | $3,100.00 | +2.9% | |
| Aug 12, 2020 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 1,770 | $7.00 | $12,394.50 | +11.4% | |
| Mar 30, 2020 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 500 | $5.10 | $2,550.00 | +3.3% | |
| Mar 23, 2020 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 1,500 | $4.12 | $6,175.00 | +11.1% | |
| Aug 14, 2019 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 2,000 | $3.78 | $7,550.00 | +17.3% | |
| May 15, 2019 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 1,500 | $3.80 | $5,700.00 | +14.9% | |
| Dec 28, 2018 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 1,050 | $2.36 | $2,473.38 | +11.7% | |
| Dec 17, 2018 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 701 | $2.95 | $2,067.63 | +8.4% | |
| Nov 9, 2018 | PESI Perma Fix Environmental Services Inc | President and CEO | Buy | 2,300 | $3.45 | $7,935.00 | +38.3% | |
| Aug 15, 2017 | PESI Perma Fix Environmental Services Inc | Executive Vice President/ COO | Buy | 3,000 | $3.43 | $10,275.00 | +100.0% |