PESI · Insider trading · 13F holders · Congress trades
Perma Fix Environmental Services Inc (PESI)
Who is buying and selling PESI: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 7
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 0
PESI at a glance
- No open-market insider purchases or sales of PESI were filed in the last 90 days.
- 7 13F filers hold PESI among their 50 largest positions, worth $35.8M combined. The biggest bets by portfolio weight are Potomac Capital Management, Inc. (5.0%), Mak Capital One LLC (2.1%) and Prescott Group Capital Management, L.L.C. (1.0%). In their latest 13Fs, 1 manager opened a new position and 3 added to one.
- No member of Congress has disclosed a trade in PESI.
PESI insider trading
No open-market insider purchases or sales of PESI were filed in the last 90 days.
Who owns PESI? Hedge funds and superinvestors
7 13F filers hold PESI among their 50 largest positions, worth $35.8M combined. The biggest bets by portfolio weight are Potomac Capital Management, Inc. (5.0%), Mak Capital One LLC (2.1%) and Prescott Group Capital Management, L.L.C. (1.0%). In their latest 13Fs, 1 manager opened a new position and 3 added to one.
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Mak Capital One LLCHedge fund | 2.1% | $14.8M | 1,032,958 | +12.4% shares | Q2 2026 |
| Prescott Group Capital Management, L.L.C.Hedge fund | 1.0% | $11.1M | 777,142 | +0.0% shares | Q2 2026 |
| Potomac Capital Management, Inc.Hedge fund | 5.0% | $6.8M | 477,000 | +60.8% shares | Q2 2026 |
| Cm Wealth Advisors LLCWealth manager | 0.2% | $1.3M | 87,839 | — | Q2 2026 |
| Owls Nest Partners IA, LLCHedge fund | 0.3% | $808K | 56,555 | New | Q2 2026 |
| Pale Fire Capital SEAsset manager | 0.1% | $795K | 55,627 | +14.4% shares | Q2 2026 |
| Fifth Lane Capital, LPHedge fund | 15.8% | $257K | 18,000 | — | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 7). Screen PESI in the grand portfolio →
PESI stock trades by members of Congress
No member of Congress has disclosed a trade in PESI.
PESI questions and answers
Are insiders buying PESI stock?
No open-market insider purchases or sales of PESI were filed in the last 90 days.
Which hedge funds own PESI?
7 13F filers hold PESI among their 50 largest positions, worth $35.8M combined. The biggest bets by portfolio weight are Potomac Capital Management, Inc. (5.0%), Mak Capital One LLC (2.1%) and Prescott Group Capital Management, L.L.C. (1.0%). In their latest 13Fs, 1 manager opened a new position and 3 added to one.
Has Congress traded PESI?
No member of Congress has disclosed a trade in PESI.
Who is the largest holder of PESI?
Among 13F filers, Mak Capital One LLC reports the largest PESI position, $14.8M (1,032,958 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Potomac Capital Management, Inc.'s: 5.0% of its portfolio.
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