Key facts
- PESI - PERMA FIX ENVIRONMENTAL SERVICES INC has 14 insiders with reported activity on this page.
- Net insider value flow over the last year: -$23,210.
- Recent transaction rows are available for direct filing-level review.
Insider Transactions Reported by 14 Insiders of PERMA FIX ENVIRONMENTAL SERVICES INC
- Symbol
- PESI on Nasdaq
- Location
- Atlanta, GA
Change
- Buy value: $25,406; sell value: $48,616.
- Net share flow: -2,756.
Research use
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsNet insider flow leans to selling over the last 12 months. Net value: -$23,210.
Buys
$25,406
Shares: 2,897
Insiders: 2
Sells
$48,616
Shares: 5,653
Insiders: 1
Net
-$23,210
Shares: -2,756
Insiders: 1
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 2,897 | 5,653 | $25,406 | $48,616 | -$23,210 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
PERMA FIX ENVIRONMENTAL SERVICES INC executives and other stock owners filed with the SEC include:
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Louis F. Centofanti | EVP of Strategic Initiatives, Director | $3,905,484 | Mixed | 17 Nov 2025 | ||
| Mark A. Zwecker | Director | $3,072,451 | Mixed | 01 Apr 2026 | ||
| Joe Reeder | Director | $2,994,997 | Mixed | 01 Apr 2026 | ||
| Larry Shelton | Director | $2,457,794 | +$18,185 | +0.75% | Mixed | 01 Apr 2026 |
| Mark Duff | President and CEO, Director | $1,083,175 | +$7,221 | +0.67% | Filing P/S | 11 Sep 2025 |
| Joseph Timothy Grumski | Director | $832,614 | Mixed | 01 Apr 2026 | ||
| Zach Paul Wamp | Director | $662,536 | Mixed | 01 Apr 2026 | ||
| Thomas P. Bostick | Director | $621,908 | Mixed | 01 Apr 2026 | ||
| Richard Grondin | EVP of Hanford & Int. Waste Op | $566,332 | Mixed | 20 Jan 2026 | ||
| Ben Naccarato | Chief Financial Officer | $341,677 | Filing P/S | 21 Mar 2025 | ||
| Andy Lombardo | EVP of Nuclear & Technical Svc | $89,857 | Mixed | 05 Dec 2023 | ||
| Kerry C. Duggan | Director | $85,876 | -$48,616 | -36% | Mixed | 01 Apr 2026 |
| Troy Eshleman | Chief Operating Officer | $9,923 | Filing P/S | 18 Mar 2025 | ||
| William J. Nasgovitz | No Longer Subject to Sec. 16 | Mixed | 17 Sep 2021 |
Top shareholders of PERMA FIX ENVIRONMENTAL SERVICES INC (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| Hold Alapkezelo Zrt. |
13D/G
|
— |
5.1%
|
944,312
|
$12,672,667 | $0 | 31 Mar 2026 | |
| Louis F. Centofanti |
3/4/5
|
EVP of Strategic Initiatives, Director |
1.5%
|
280,365
|
$3,905,484 | — | 17 Nov 2025 | |
| Mark A. Zwecker |
3/4/5
|
Director |
1.3%
|
244,039
|
$3,072,451 | — | 01 Apr 2026 | |
| Larry Shelton |
3/4/5
|
Director |
1.1%
|
195,218
|
$2,457,794 | +$18,185 | 01 Apr 2026 | |
| Mark Duff |
3/4/5
|
President and CEO, Director |
0.73%
|
134,556
|
$1,083,175 | +$7,221 | 11 Sep 2025 | |
| BlackRock, Inc. |
13F
|
Company |
6.3%
|
1,170,303
|
$12,510,539 | — | 31 Mar 2026 | |
| MAK CAPITAL ONE LLC |
13F
|
Company |
5%
|
918,673
|
$9,820,614 | — | 31 Mar 2026 | |
| PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C. |
13F
|
Company |
4.2%
|
777,142
|
$8,307,648 | — | 31 Mar 2026 | |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
|
Company |
4.1%
|
759,435
|
$8,118,360 | — | 31 Mar 2026 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
2.3%
|
432,701
|
$4,626,994 | — | 31 Mar 2026 | |
| HEARTLAND ADVISORS INC |
13F
|
Company |
2.2%
|
400,000
|
$4,276,000 | — | 31 Mar 2026 | |
| DIAMOND HILL CAPITAL MANAGEMENT INC |
13F
|
Company |
1.9%
|
355,978
|
$3,805,405 | — | 31 Mar 2026 | |
| STATE STREET CORP |
13F
|
Company |
1.8%
|
335,547
|
$3,586,997 | — | 31 Mar 2026 | |
| Potomac Capital Management, Inc. |
13F
|
Company |
1.6%
|
296,700
|
$3,171,723 | — | 31 Mar 2026 | |
| GROUP ONE TRADING LLC |
13F
|
Company |
1.3%
|
247,674
|
$2,647,635 | — | 31 Mar 2026 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
0.88%
|
163,787
|
$1,750,465 | — | 31 Mar 2026 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
0.77%
|
142,687
|
$1,525,324 | — | 31 Mar 2026 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.7%
|
129,568
|
$1,385,082 | — | 31 Mar 2026 | |
| North Star Investment Management Corp. |
13F
|
Company |
0.65%
|
120,532
|
$1,288,487 | — | 31 Mar 2026 | |
| MYDA Advisors LLC |
13F
|
Company |
0.65%
|
120,000
|
$1,282,800 | — | 31 Mar 2026 | |
| VANGUARD FIDUCIARY TRUST CO |
13F
|
Company |
0.64%
|
119,253
|
$1,274,815 | — | 31 Mar 2026 | |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
|
Company |
0.54%
|
100,318
|
$1,072,399 | — | 31 Mar 2026 | |
| CITADEL ADVISORS LLC |
13F
|
Company |
0.37%
|
69,313
|
$740,956 | — | 31 Mar 2026 | |
| D. E. Shaw & Co., Inc. |
13F
|
Company |
0.34%
|
62,989
|
$673,352 | — | 31 Mar 2026 | |
| UBS Group AG |
13F
|
Company |
0.34%
|
62,082
|
$663,657 | — | 31 Mar 2026 | |
| Squarepoint Ops LLC |
13F
|
Company |
0.28%
|
51,940
|
$555,239 | — | 31 Mar 2026 | |
| Pale Fire Capital SE |
13F
|
Company |
0.26%
|
48,626
|
$519,812 | — | 31 Mar 2026 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
0.24%
|
45,190
|
$483,081 | — | 31 Mar 2026 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
0.24%
|
43,590
|
$465,977 | — | 31 Mar 2026 | |
| Bank of New York Mellon Corp |
13F
|
Company |
0.22%
|
40,379
|
$431,647 | — | 31 Mar 2026 | |
| CORSAIR CAPITAL MANAGEMENT, L.P. |
13F
|
Company |
0.2%
|
37,649
|
$402,468 | — | 31 Mar 2026 | |
| SIMPLEX TRADING, LLC |
13F
|
Company |
0.17%
|
31,318
|
$334,789 | — | 31 Mar 2026 | |
| GatePass Capital, LLC |
13F
|
Company |
0.16%
|
29,742
|
$317,938 | — | 31 Mar 2026 | |
| JANE STREET GROUP, LLC |
13F
|
Company |
0.15%
|
28,525
|
$304,932 | — | 31 Mar 2026 | |
| MORGAN STANLEY |
13F
|
Company |
0.14%
|
26,718
|
$285,615 | — | 31 Mar 2026 | |
| XTX Topco Ltd |
13F
|
Company |
0.13%
|
23,227
|
$248,297 | — | 31 Mar 2026 | |
| Nuveen, LLC |
13F
|
Company |
0.12%
|
22,454
|
$240,033 | — | 31 Mar 2026 | |
| RHUMBLINE ADVISERS |
13F
|
Company |
0.12%
|
21,410
|
$228,865 | — | 31 Mar 2026 | |
| WELLS FARGO & COMPANY/MN |
13F
|
Company |
0.11%
|
20,830
|
$222,673 | — | 31 Mar 2026 | |
| Rothschild Wealth LLC |
13F
|
Company |
0.11%
|
20,600
|
$220,214 | — | 31 Mar 2026 | |
| BROWN ADVISORY INC |
13F
|
Company |
0.11%
|
20,000
|
$213,800 | — | 31 Mar 2026 | |
| BAILARD, INC. |
13F
|
Company |
0.1%
|
17,800
|
$190,282 | — | 31 Mar 2026 | |
| Oxler Private Wealth LLC |
13F
|
Company |
0.09%
|
17,005
|
$181,784 | — | 31 Mar 2026 | |
| IMC-Chicago, LLC |
13F
|
Company |
0.09%
|
16,933
|
$181,014 | — | 31 Mar 2026 | |
| GUIDANCE CAPITAL, INC |
13F
|
Company |
0.09%
|
16,302
|
$210,785 | — | 31 Mar 2026 | |
| Quent Capital, LLC |
13F
|
Company |
0.09%
|
16,199
|
$173,167 | — | 31 Mar 2026 | |
| GSA CAPITAL PARTNERS LLP |
13F
|
Company |
0.09%
|
16,097
|
$172,000 | — | 31 Mar 2026 | |
| OSAIC HOLDINGS, INC. |
13F
|
Company |
0.09%
|
16,000
|
$171,040 | — | 31 Mar 2026 | |
| DEUTSCHE BANK AG\ |
13F
|
Company |
0.08%
|
14,621
|
$156,298 | — | 31 Mar 2026 | |
| Fermata Advisors, LLC |
13F
|
Company |
0.07%
|
12,936
|
$138,286 | — | 31 Mar 2026 |
Recent Insider Transactions by Companies or Individuals for PERMA FIX ENVIRONMENTAL SERVICES INC
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Mark A. Zwecker | PESI | Common Stock | Award | 0.63% | 1,520 | 244,039 | 01 Apr 2026 | Direct | ||
| Joe Reeder | PESI | Common Stock | Award | 0.8% | 1,886 | 237,887 | 01 Apr 2026 | Direct | ||
| Kerry C. Duggan | PESI | Common Stock | Award | 18.3% | 1,054 | 6,821 | 01 Apr 2026 | Direct | ||
| Joseph Timothy Grumski | PESI | Common Stock | Award | 3.29% | 2,105 | 66,133 | 01 Apr 2026 | Direct | ||
| Thomas P. Bostick | PESI | Common Stock | Award | 3.26% | 1,559 | 49,397 | 01 Apr 2026 | Direct | ||
| Zach Paul Wamp | PESI | Common Stock | Award | 2.12% | 1,094 | 52,624 | 01 Apr 2026 | Direct | ||
| Larry Shelton | PESI | Common Stock | Award | 0.94% | 1,824 | 195,218 | 01 Apr 2026 | Direct | ||
| Richard Grondin | PESI | Common Stock | Tax liability | -10.4% | -4,284 | 37,037 | 20 Jan 2026 | Direct | ||
| Richard Grondin | PESI | Common Stock | Options Exercise | 34.3% | 11,000 | 43,037 | 20 Jan 2026 | Direct | ||
| Richard Grondin | PESI | Stock Option | Options Exercise | -68.8% | -11,000 | 5,000 | 20 Jan 2026 | Direct | ||
| Joe Reeder | PESI | Common Stock | Award | 0.66% | 1,549 | 236,001 | 02 Jan 2026 | Direct | ||
| Thomas P. Bostick | PESI | Common Stock | Award | 2.85% | 1,324 | 47,838 | 02 Jan 2026 | Direct | ||
| Zach Paul Wamp | PESI | Common Stock | Award | 1.91% | 964 | 51,530 | 02 Jan 2026 | Direct | ||
| Joseph Timothy Grumski | PESI | Common Stock | Award | 2.96% | 1,840 | 64,028 | 02 Jan 2026 | Direct | ||
| Kerry C. Duggan | PESI | Common Stock | Award | 19.2% | 929 | 5,767 | 02 Jan 2026 | Direct | ||
| Larry Shelton | PESI | Common Stock | Award | 0.83% | 1,583 | 193,394 | 02 Jan 2026 | Direct | ||
| Mark A. Zwecker | PESI | Common Stock | Award | 0.55% | 1,325 | 242,519 | 02 Jan 2026 | Direct | ||
| Joe Reeder | PESI | Common Stock | Gift | -5.62% | -13,956 | 234,452 | 15 Dec 2025 | Direct | ||
| Louis F. Centofanti | PESI | Common Stock | Gift | -0.55% | -1,200 | 217,565 | 17 Nov 2025 | Direct | ||
| Thomas P. Bostick | PESI | Common Stock | Award | 3.83% | 1,716 | 46,514 | 01 Oct 2025 | Direct | ||
| Joseph Timothy Grumski | PESI | Common Stock | Award | 3.72% | 2,228 | 62,188 | 01 Oct 2025 | Direct | ||
| Mark A. Zwecker | PESI | Common Stock | Award | 0.67% | 1,609 | 241,194 | 01 Oct 2025 | Direct | ||
| Zach Paul Wamp | PESI | Common Stock | Award | 2.43% | 1,201 | 50,566 | 01 Oct 2025 | Direct | ||
| Larry Shelton | PESI | Common Stock | Award | 1.02% | 1,931 | 191,811 | 01 Oct 2025 | Direct | ||
| Joe Reeder | PESI | Common Stock | Award | 0.84% | 2,063 | 248,408 | 01 Oct 2025 | Direct | ||
| Kerry C. Duggan | PESI | Common Stock | Award | 31.5% | 1,158 | 4,838 | 01 Oct 2025 | Direct | ||
| Kerry C. Duggan | PESI | Common Stock | Sale | -60.6% | $48,616 | $8.60 | -5,653 | 3,680 | 16 Sep 2025 | Direct |
| Mark Duff | PESI | Common Stock | Purchase | 0.67% | $7,221 | $8.05 | 897 | 134,556 | 11 Sep 2025 | Direct |
| Larry Shelton | PESI | Common Stock | Purchase | 0.53% | $8,575 | $8.58 | 1,000 | 189,880 | 11 Sep 2025 | Direct |
| Larry Shelton | PESI | Common Stock | Purchase | 0.53% | $9,610 | $9.61 | 1,000 | 188,880 | 09 Sep 2025 | Direct |
| Larry Shelton | PESI | Common Stock | Options Exercise | 1.29% | 2,400 | 187,880 | 02 Sep 2025 | Direct | ||
| Larry Shelton | PESI | Stock Option (Right to Buy) | Options Exercise | -100% | -2,400 | 0 | 02 Sep 2025 | Direct | ||
| Mark A. Zwecker | PESI | Common Stock | Options Exercise | 1.01% | 2,400 | 239,585 | 28 Aug 2025 | Direct | ||
| Mark A. Zwecker | PESI | Stock Option (Right to Buy) | Options Exercise | -100% | -2,400 | 0 | 28 Aug 2025 | Direct | ||
| Kerry C. Duggan | PESI | Stock Option (Right to Buy) | Award | 10,000 | 10,000 | 24 Jul 2025 | Direct | |||
| Mark A. Zwecker | PESI | Stock Option (Right to Buy) | Award | 10,000 | 10,000 | 24 Jul 2025 | Direct | |||
| Joseph Timothy Grumski | PESI | Stock Option (Right to Buy) | Award | 10,000 | 10,000 | 24 Jul 2025 | Direct | |||
| Thomas P. Bostick | PESI | Stock Option (Right to Buy) | Award | 10,000 | 10,000 | 24 Jul 2025 | Direct | |||
| Larry Shelton | PESI | Stock Option (Right to Buy) | Award | 10,000 | 10,000 | 24 Jul 2025 | Direct | |||
| Joe Reeder | PESI | Stock Option (Right to Buy) | Award | 10,000 | 10,000 | 24 Jul 2025 | Direct | |||
| Zach Paul Wamp | PESI | Stock Option (Right to Buy) | Award | 10,000 | 10,000 | 24 Jul 2025 | Direct | |||
| Richard Grondin | PESI | Common Stock | Tax liability | -14.5% | -5,188 | 30,686 | 14 Jul 2025 | Direct | ||
| Richard Grondin | PESI | Common Stock | Options Exercise | 42.8% | 11,000 | 36,686 | 14 Jul 2025 | Direct | ||
| Richard Grondin | PESI | Stock Option | Options Exercise | -52.4% | -11,000 | 10,000 | 14 Jul 2025 | Direct | ||
| Mark A. Zwecker | PESI | Common Stock | Award | 0.67% | 1,586 | 237,185 | 01 Jul 2025 | Direct | ||
| Larry Shelton | PESI | Common Stock | Award | 1.03% | 1,895 | 185,480 | 01 Jul 2025 | Direct | ||
| Kerry C. Duggan | PESI | Common Stock | Award | 13.5% | 1,112 | 9,333 | 01 Jul 2025 | Direct | ||
| Joseph Timothy Grumski | PESI | Common Stock | Award | 3.83% | 2,202 | 59,690 | 01 Jul 2025 | Direct | ||
| Thomas P. Bostick | PESI | Common Stock | Award | 3.67% | 1,584 | 44,798 | 01 Jul 2025 | Direct | ||
| Joe Reeder | PESI | Common Stock | Award | 0.81% | 1,980 | 246,345 | 01 Jul 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.