Perma Fix Environmental Services Inc (PESI) Insider Ownership

Historic Insider Ownership Trends

Over the 90-day window ending January 14, 2026, Perma Fix Environmental Services's three dominant insider ownership positions are held by Director Mark A Zwecker (242.52K shares), Director Joe Reeder (236.00K shares), Evp Of Strategic Initiatives Louis F Centofanti (218.76K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares Report Date
Mark A Zwecker 242,519 05 Jan, 2026
Joe Reeder 236,001 06 Jan, 2026
Louis F Centofanti Evp Of Strategic Initiatives 218,765 18 Mar, 2025
Larry Shelton 193,394 05 Jan, 2026
Mark Duff President And Ceo 134,556 12 Sep, 2025
Joseph Timothy Grumski 64,028 05 Jan, 2026
Zach Paul Wamp 51,530 05 Jan, 2026
Ben Naccarato Chief Financial Officer 48,811 24 Mar, 2025
Thomas Bostick 47,838 05 Jan, 2026
Richard Grondin Evp Of Hanford & Int. Waste Op 34,592 15 Jul, 2025
Andy Lombardo Evp Of Nuclear & Technical Svc 17,448 06 Dec, 2023
Kerry C Duggan 5,767 05 Jan, 2026
Troy Eshleman Chief Operating Officer 1,350 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
02 Jan, 2026 Mark A Zwecker Common Stock A 1,325 $9.44 242,519 D A
02 Jan, 2026 Joe Reeder Common Stock A 1,549 $9.44 236,001 D A
02 Jan, 2026 Larry Shelton Common Stock A 1,583 $9.44 193,394 D A
02 Jan, 2026 Thomas Bostick Common Stock A 1,324 $9.44 47,838 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
02 Jan, 2026 Kerry C Duggan Common Stock A 929 $9.44 5,767 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 $0.00 234,816 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 364 $0.00 234,452 D G
01 Oct, 2025 Mark A Zwecker Common Stock A 1,609 $7.58 241,194 D A
01 Oct, 2025 Joe Reeder Common Stock A 2,063 $7.58 248,408 D A
01 Oct, 2025 Larry Shelton Common Stock A 1,931 $7.58 191,811 D A
01 Oct, 2025 Thomas Bostick Common Stock A 1,716 $7.58 46,514 D A
01 Oct, 2025 Zach Paul Wamp Common Stock A 1,201 $7.58 50,566 D A
01 Oct, 2025 Joseph Timothy Grumski Common Stock A 2,228 $7.58 62,188 D A
01 Oct, 2025 Kerry C Duggan Common Stock A 1,158 $7.58 4,838 D A
16 Sep, 2025 Kerry C Duggan Common Stock D 5,653 $8.60 3,680 D S