PERMA FIX ENVIRONMENTAL SERVICES INC — Director's Dealing 2023

May 24, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: PERMA FIX ENVIRONMENTAL SERVICES INC (PESI)
CIK: 0000891532
Period of Report: 2023-05-22

Reporting Person: Duff Mark (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2023-05-22	Common Stock	M	100000	$3.6500	Acquired	140984	Direct
2023-05-22	Common Stock	F	33032	$11.0500	Disposed	107952	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2023-05-22	Stock Option	$3.6500	M	100000	Disposed	2023-07-27	Common Stock (100000)	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option	$3.1500	2025-01-17	Common Stock (25000)	25000	Direct
Stock Option	$7.0050	2027-10-14	Common Stock (50000)	50000	Direct
Stock Option	$3.9500	2029-01-19	Common Stock (70000)	70000	Direct

Footnotes

F1: On May 22, 2023, the Reporting Person exercised the incentive stock option granted 07/27/2017 under the Company's 2017 Stock Option Plan (the "2017 Plan") for the purchase of 100,000 shares of the Company's Common Stock at an exercise price of $3.65 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 $365,000. Since the fair market value of the Company's Common Stock on May 22, 2023 (as determined in accordance with the 2017 Plan) was $11.05 per share, the Company withheld 33,032 shares of Common Stock ($365,000 divided by $11.05) to pay the aggregate exercise price of the option.

F2: Incentive stock option granted 07/27/2017 under the Company's 2017 Stock Option Plan. The option is for a 6 year period and vests over a 5 year period, at 1/5 increment per year.

F3: Incentive Stock Option granted 01/17/2019 under the Company's 2017 Stock Option Plan. 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 10/14/2021 under the Company's 2017 Stock Option Plan. The option is for a 6 year period and vests over a 5 year period, at 1/5 increment per year.

F5: Incentive stock option granted 01/19/2023 under the Company's 2017 Stock Option Plan. The option is for a 6 year period and vests over a 5 year period, at 1/5 increment per year.