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

Role: EVP of Hanford & Int. Waste Op
Signature: /s/ Richard Grondin
Issuer symbol: PESI
Transactions as of: 20 Jan 2026
Net transactions value: -$8.64
Form type: 4
Filing time: 21 Jan 2026, 09:26:00 UTC
Previous filing: 15 Jul 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Grondin Richard	EVP of Hanford & Int. Waste Op	8302 DUNWOODY PLACE, SUITE 250, ATLANTA,	/s/ Richard Grondin	21 Jan 2026	0001819004

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	PESI	Common Stock	Options Exercise	$35,025	+5,000	+14%	$7.00	39,592	20 Jan 2026	Direct	F1
transaction	PESI	Common Stock	Tax liability	$35,029	-2,555	-6.5%	$13.71	37,037	20 Jan 2026	Direct	F1
transaction	PESI	Common Stock	Options Exercise	$23,700	+6,000	+16%	$3.95	43,037	20 Jan 2026	Direct	F2
transaction	PESI	Common Stock	Tax liability	$23,705	-1,729	-4%	$13.71	41,308	20 Jan 2026	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	PESI	Stock Option	Options Exercise	$0	-5,000	-50%	$0.000000	5,000	20 Jan 2026	Common Stock	5,000	$7.00	Direct	F1, F3
transaction	PESI	Stock Option	Options Exercise	$0	-6,000	-33%	$0.000000	12,000	20 Jan 2026	Common Stock	6,000	$3.95	Direct	F2, F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
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.
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.
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.
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.