Perma-Fix Environmental Services, Inc. (PESI) has 20 known insider and institutional holders on record. The largest holder is Ferguson Robert L with 290,197 shares. Other notable holders include ZWECKER MARK A and REEDER JOE.
Over the last 12 months, insiders have made 46 transactions in PESI stock — 38 buys (valued at $1.24M) and 2 sells (valued at $230.26K). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
PESI Insider Ownership
Top Holder
Ferguson Robert L
290,197 shares
Buys (12 mo)
38
$1.24M value
Sells (12 mo)
2
$230.26K value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Ferguson Robert L |
Director |
290,197 |
2012-09-14 |
|
| 2 |
Zwecker Mark A |
Director |
244,039 |
2026-04-02 |
|
| 3 |
Reeder Joe |
Director |
237,887 |
2026-04-02 |
|
| 4 |
Centofanti Louis F |
EVP of Strategic Initiatives |
217,565 |
2026-02-10 |
|
| 5 |
Lahav Jack |
Officer |
197,433 |
2016-11-01 |
|
| 6 |
Shelton Larry |
Director |
195,218 |
2026-04-02 |
|
| 7 |
Warrington Alfred C Iv |
Director |
193,070 |
2006-07-31 |
|
| 8 |
Colin Jon |
Officer |
192,332 |
2011-10-03 |
|
| 9 |
Duff Mark |
President and CEO |
134,556 |
2025-09-12 |
|
| 10 |
Schreiber Robert Jr |
President of Sya |
105,292 |
2009-12-17 |
|
| 11 |
Baughman Steven |
Chief Financial Officer |
90,000 |
2008-08-07 |
|
| 12 |
Grumski Joseph Timothy |
Director |
66,133 |
2026-04-02 |
|
| 13 |
Mcnamara Larry W |
COO-resigned Effective 9/1/09 |
54,220 |
2009-09-29 |
|
| 14 |
Wamp Zach Paul |
Director |
52,624 |
2026-04-02 |
|
| 15 |
Bostick Thomas |
Director |
49,397 |
2026-04-02 |
|
| 16 |
Naccarato Ben |
Chief Financial Officer |
48,811 |
2025-03-24 |
|
| 17 |
Kugler Gary |
Director |
46,013 |
2018-07-30 |
|
| 18 |
Young Charles E |
Director |
43,700 |
2015-07-01 |
|
| 19 |
Cochran Stanley Robert |
Director |
34,711 |
2019-10-22 |
|
| 20 |
Lombardo Andy |
EVP of Nuclear & Technical Svc |
17,448 |
2023-12-06 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-04-01 |
Duggan Kerry C |
Director |
RSU Award |
1,054 |
$8.02 |
$8.45K |
| 2026-04-01 |
Grumski Joseph Timothy |
Director |
RSU Award |
2,105 |
$8.02 |
$16.88K |
| 2026-04-01 |
Wamp Zach Paul |
Director |
RSU Award |
1,094 |
$8.02 |
$8.77K |
| 2026-04-01 |
Bostick Thomas |
Director |
RSU Award |
1,559 |
$8.02 |
$12.5K |
| 2026-04-01 |
Shelton Larry |
Director |
RSU Award |
1,824 |
$8.02 |
$14.62K |
| 2026-04-01 |
Reeder Joe |
Director |
RSU Award |
1,886 |
$8.02 |
$15.12K |
| 2026-04-01 |
Zwecker Mark A |
Director |
RSU Award |
1,520 |
$8.02 |
$12.19K |
| 2025-11-17 |
Centofanti Louis F |
EVP of Strategic Initiatives |
Gift (Given) |
600 |
- |
- |
| 2026-01-20 |
Grondin Richard |
EVP of Hanford & Int. Waste Op |
Option Exercise (Sell) |
5,000 |
$7.01 |
$35.03K |
| 2026-01-02 |
Reeder Joe |
Director |
RSU Award |
1,549 |
$9.44 |
$14.63K |
| 2026-01-02 |
Duggan Kerry C |
Director |
RSU Award |
929 |
$9.44 |
$8.77K |
| 2026-01-02 |
Grumski Joseph Timothy |
Director |
RSU Award |
1,840 |
$9.44 |
$17.37K |
| 2026-01-02 |
Wamp Zach Paul |
Director |
RSU Award |
964 |
$9.44 |
$9.1K |
| 2026-01-02 |
Bostick Thomas |
Director |
RSU Award |
1,324 |
$9.44 |
$12.5K |
| 2026-01-02 |
Shelton Larry |
Director |
RSU Award |
1,583 |
$9.44 |
$14.95K |
| 2026-01-02 |
Zwecker Mark A |
Director |
RSU Award |
1,325 |
$9.44 |
$12.51K |
| 2025-12-15 |
Reeder Joe |
Director |
Gift (Given) |
364 |
- |
- |
| 2025-10-01 |
Duggan Kerry C |
Director |
RSU Award |
1,158 |
$7.58 |
$8.77K |
| 2025-10-01 |
Grumski Joseph Timothy |
Director |
RSU Award |
2,228 |
$7.58 |
$16.88K |
| 2025-10-01 |
Wamp Zach Paul |
Director |
RSU Award |
1,201 |
$7.58 |
$9.1K |
| 2025-10-01 |
Bostick Thomas |
Director |
RSU Award |
1,716 |
$7.58 |
$13K |
| 2025-10-01 |
Shelton Larry |
Director |
RSU Award |
1,931 |
$7.58 |
$14.63K |
| 2025-10-01 |
Reeder Joe |
Director |
RSU Award |
2,063 |
$7.58 |
$15.63K |
| 2025-10-01 |
Zwecker Mark A |
Director |
RSU Award |
1,609 |
$7.58 |
$12.19K |
| 2025-09-16 |
Duggan Kerry C |
Director |
Informative Sell |
5,653 |
$8.60 |
$48.62K |
