Richard Grondin - 20 Jan 2026 Form 4 Insider Report for PERMA FIX ENVIRONMENTAL SERVICES INC (PESI)

Reporting relationship: EVP of Hanford & Int. Waste Op
Issuer ticker: PESI
Reported as of: 20 Jan 2026
Net transaction value: -$8.64
SEC form: 4
Accepted by SEC: 21 Jan 2026, 09:26:00 UTC
Prior SEC filing: 15 Jul 2025
Source filing: View source filing
Reporting owner signature: /s/ Richard Grondin

Key filing fact

Richard Grondin filed Form 4 for PERMA FIX ENVIRONMENTAL SERVICES INC (PESI) on 21 Jan 2026.

Key facts

This page summarizes Richard Grondin's Form 4 filing for PERMA FIX ENVIRONMENTAL SERVICES INC (PESI).
6 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 21 Jan 2026, 09:26.

Change

Previous filing in this sequence was filed on 15 Jul 2025.
Current net transaction value: -$8.64.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001819004 Primary reporting owner

Grondin Richard

Relationship: EVP of Hanford & Int. Waste Op
Address: 8302 DUNWOODY PLACE, SUITE 250, ATLANTA,
Signature: /s/ Richard Grondin
Signature date: 21 Jan 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

PESI transaction

Common Stock

Options Exercise

Transaction value: $35,025
Shares: +5,000
Change %: +14%
Price: $7.00
Shares after: 39,592
Date: 20 Jan 2026
Ownership: Direct
Footnotes: F1

PESI transaction

Common Stock

Tax liability

Transaction value: $35,029
Shares: -2,555
Change %: -6.5%
Price: $13.71
Shares after: 37,037
Date: 20 Jan 2026
Ownership: Direct
Footnotes: F1

PESI transaction

Common Stock

Options Exercise

Transaction value: $23,700
Shares: +6,000
Change %: +16%
Price: $3.95
Shares after: 43,037
Date: 20 Jan 2026
Ownership: Direct
Footnotes: F2

PESI transaction

Common Stock

Tax liability

Transaction value: $23,705
Shares: -1,729
Change %: -4%
Price: $13.71
Shares after: 41,308
Date: 20 Jan 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

PESI transaction Derivative

Stock Option

Options Exercise

Transaction value: $0
Shares: -5,000
Change %: -50%
Price: $0.000000
Shares after: 5,000
Date: 20 Jan 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 5,000
Exercise price: $7.00
Footnotes: F1, F3

PESI transaction Derivative

Stock Option

Options Exercise

Transaction value: $0
Shares: -6,000
Change %: -33%
Price: $0.000000
Shares after: 12,000
Date: 20 Jan 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 6,000
Exercise price: $3.95
Footnotes: F2, F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

On January 20, 2026, the Reporting Person exercised the incentive stock option granted 10/14/2021 under the Company's 2017 Stock Option Plan (the "2017 Plan") for the purchase of 5,000 shares of the Company's Common Stock at an exercise price of $7.005 per share (the "Option shares"). As permitted by the 2017 Plan, the Reporting Person elected to pay the exercise price of the Option Shares by having the Company withhold from the Option Shares a number of shares having a fair market value equal to the aggregate exercise price of $35,025. Since the fair market value of the Company's Common Stock on January 20, 2026, (as determined in accordance with the 2017 Plan) was $13.71 per share, the Company withheld 2,555 shares of Common Stock ($35,025 divided by $13.71) to pay the aggregate exercise price of the option.

Footnote F2

January 20, 2026,, the Reporting Person exercised the incentive stock option granted 1/19/2023 under the Company's 2017 Stock Option Plan (the "2017 Plan") for the purchase of 6,000 shares of the Company's Common Stock at an exercise price of $3.95 per share (the "Option shares"). As permitted by the 2017 Plan, the Reporting Person elected to pay the exercise price of the Option Shares by having the Company withhold from the Option Shares a number of shares having a fair market value equal to the aggregate exercise price of $23,700. Since the fair market value of the Company's Common Stock on January 20, 2026, (as determined in accordance with the 2017 Plan) was $13.71 per share, the Company withheld 1,729 shares of Common Stock ($23,700 divided by $13.71) to pay the aggregate exercise price of the option.

Footnote F3

Incentive stock option granted 10/14/2021 under the Company's 2017 Stock Option Plan for the purchase of up to 25,000 shares of the Company's Common Stock. The option is for a 6 year period and vests over a 5 year period, at 1/5 increment per year.

Footnote F4

Incentive stock option granted 01/19/2023 under the Company's 2017 Stock Option Plan for the purchase of up to 30,000 shares of the Company's Common Stock.The option is for a 6 year period and vests over a 5 year period, at 1/5 increment per year.