PERMA FIX ENVIRONMENTAL SERVICES INC — Director's Dealing 2022

May 11, 2022

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: PERMA FIX ENVIRONMENTAL SERVICES INC (PESI)
CIK: 0000891532
Period of Report: 2022-05-09

Reporting Person: Duff Mark (President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2022-05-09	Common Stock	M	50000	$3.9700	Acquired	69958	Direct
2022-05-09	Common Stock	F	33474	$5.9300	Disposed	36484	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2022-05-09	Stock Option (right to buy)	$3.9700	M	50000	Disposed	2022-05-22	Common Stock (50000)	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option (right to buy)	$3.6500	2023-07-27	Common Stock (100000)	100000	Direct
Stock Option (right to buy)	$3.1500	2025-01-17	Common Stock (25000)	25000	Direct
Stock Option (right to buy)	$7.0050	2027-10-14	Common Stock (50000)	50000	Direct

Footnotes

F1: On May 9, 2022, the Reporting Person exercised 100% of an incentive stock option granted May 15, 2016 under the Company's 2010 Stock Option Plan (the "2010 Plan"), for the purchase of 50,000 shares of the Company's Common Stock at an exercise price of $3.97 per share (the "Option Shares"). As permitted by the 2010 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 $198,500. Since the fair market value of the Company's Common Stock on May 9, 2022 (as determined in accordance with the 2010 Plan) was $5.93 per share, the Company withheld 33,474 shares of Common Stock ($198,500 divided by $5.93) to pay the aggregate exercise price of the option.

F2: Incentive stock option granted 05/15/2016 under the 2010 Plan. The option was for a 6-year period and vested over a 3-year period, in equal one-third increments per year.

F3: Incentive stock option granted 07/27/2017 under the Company's 2017 Stock Option Plan (the "2017 Plan"). The option is for a 6-year period and vests over a 5-year period, in equal one-fifth increments per year.

F4: Incentive stock option granted 01/17/2019 under the Company's 2017 Plan. The option is for a 6-year period and vests over a 5-year period, in equal one-fifth increments per year.

F5: Incentive stock option granted 10/14/2021 under the Company's 2017 Plan. The option is for a 6-year period and vests over a 5-year period, in equal one-fifth increments per year.