Perma Fix Environmental Services Inc (PESI) Insider Ownership

Historic Insider Ownership Trends

Perma Fix Environmental Services's top three insider shareholders as of March 23, 2026 are Mark A Zwecker (Director, 242.52K shares), Joe Reeder (Director, 236.00K shares), Louis F Centofanti (Evp Of Strategic Initiatives, 218.76K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Mark A Zwecker 242,519 0 05 Jan, 2026
Joe Reeder 236,001 0 06 Jan, 2026
Louis F Centofanti Evp Of Strategic Initiatives 218,765 0 18 Mar, 2025
Larry Shelton 193,394 0 05 Jan, 2026
Mark Duff President And Ceo 134,556 0 12 Sep, 2025
Joseph Timothy Grumski 64,028 0 05 Jan, 2026
Zach Paul Wamp 51,530 0 05 Jan, 2026
Ben Naccarato Chief Financial Officer 48,811 0 24 Mar, 2025
Thomas Bostick 47,838 0 05 Jan, 2026
Richard Grondin Evp Of Hanford Int. Waste Op 41,308 0 21 Jan, 2026
Andy Lombardo Evp Of Nuclear Technical Svc 17,448 0 06 Dec, 2023
Kerry C Duggan 5,767 0 05 Jan, 2026
Troy Eshleman Chief Operating Officer 1,350 0 19 Mar, 2025

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
20 Jan, 2026 Richard Grondin Common Stock A 5,000 $7.01 39,592 D M
20 Jan, 2026 Richard Grondin Common Stock D 2,555 $13.71 37,037 D F
20 Jan, 2026 Richard Grondin Common Stock A 6,000 $3.95 43,037 D M
20 Jan, 2026 Richard Grondin Common Stock D 1,729 $13.71 41,308 D F
20 Jan, 2026 Richard Grondin Stock Option D 5,000 $0.00 5,000 D M
20 Jan, 2026 Richard Grondin Stock Option D 6,000 $0.00 12,000 D M
02 Jan, 2026 Joe Reeder Common Stock A 1,549 $9.44 236,001 D A
02 Jan, 2026 Kerry C Duggan Common Stock A 929 $9.44 5,767 D A
02 Jan, 2026 Mark A Zwecker Common Stock A 1,325 $9.44 242,519 D A
02 Jan, 2026 Thomas Bostick Common Stock A 1,324 $9.44 47,838 D A
02 Jan, 2026 Larry Shelton Common Stock A 1,583 $9.44 193,394 D A
02 Jan, 2026 Zach Paul Wamp Common Stock A 964 $9.44 51,530 D A
02 Jan, 2026 Joseph Timothy Grumski Common Stock A 1,840 $9.44 64,028 D A
15 Dec, 2025 Joe Reeder Common Stock D 11,048 $0.00 237,360 D G
15 Dec, 2025 Joe Reeder Common Stock D 1,090 $0.00 236,270 D G
15 Dec, 2025 Joe Reeder Common Stock D 727 $0.00 235,543 D G
15 Dec, 2025 Joe Reeder Common Stock D 727 $0.00 234,816 D G
15 Dec, 2025 Joe Reeder Common Stock D 364 $0.00 234,452 D G
01 Oct, 2025 Joe Reeder Common Stock A 2,063 $7.58 248,408 D A
01 Oct, 2025 Mark A Zwecker Common Stock A 1,609 $7.58 241,194 D A