# EDGAR Filing Document

**Accession Number:** 0000891532
**File Stem:** 0001493152-26-003012
**Filing Date:** 2026-1
**Character Count:** 8264
**Document Hash:** 2f599c7de3affbb1c0055458f296e5c5
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001493152-26-003012.hdr.sgml**: 20260121

**ACCESSION NUMBER**: 0001493152-26-003012

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260120

**FILED AS OF DATE**: 20260121

**DATE AS OF CHANGE**: 20260121

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Grondin Richard
- **CENTRAL INDEX KEY:** 0001819004

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-11596
- **FILM NUMBER:** 26545027

**MAIL ADDRESS:**
- **STREET 1:** 8302 DUNWOODY PLACE
- **STREET 2:** SUITE 250
- **CITY:** ATLANTA
- **STATE:** GA
- **ZIP:** 30350
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PERMA FIX ENVIRONMENTAL SERVICES INC
- **CENTRAL INDEX KEY:** 0000891532
- **STANDARD INDUSTRIAL CLASSIFICATION:** HAZARDOUS WASTE MANAGEMENT [4955]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 581954497
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 8302 DUNWOODY PLACE
- **STREET 2:** SUITE 250
- **CITY:** ATLANTA
- **STATE:** GA
- **ZIP:** 30350
- **BUSINESS PHONE:** 7705879898

**MAIL ADDRESS:**
- **STREET 1:** 8302 DUNWOODY PLACE
- **STREET 2:** SUITE 250
- **CITY:** ATLANTA
- **STATE:** GA
- **ZIP:** 30350

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Grondin Richard<br><sub>(Last) (First) (Middle)</sub><br>8302 DUNWOODY PLACE, SUITE 250<br><sub>(Street)</sub><br>ATLANTA,, GA 30350<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-01-20 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_EVP of Hanford & Int. Waste Op_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>PERMA FIX ENVIRONMENTAL SERVICES INC [ PESI ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2026-01-20 |  | M |  | 5000<sup>(1)</sup> | A | $7.0050 | 39592 | D |  |
| Common Stock | 2026-01-20 |  | F |  | 2555<sup>(1)</sup> | D | $13.7100 | 37037 | D |  |
| Common Stock | 2026-01-20 |  | M |  | 6000<sup>(2)</sup> | A | $3.9500 | 43037 | D |  |
| Common Stock | 2026-01-20 |  | F |  | 1729<sup>(2)</sup> | D | $13.7100 | 41308 | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Stock Option | $7.0050 | 2026-01-20 |  | M |  |  | 5000<sup>(1)</sup> | <sup>(3)</sup> | 2027-10-14 | Common Stock | 5000 | $0 | 5000 | D |  |
| Stock Option | $3.9500 | 2026-01-20 |  | M |  |  | 6000<sup>(2)</sup> | <sup>(4)</sup> | 2029-01-19 | Common Stock | 6000 | $0 | 12000 | D |  |

---

### Footnotes:

(1) 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.

(2) 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.

(3) 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.

(4) 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.

**Signature:** /s/ Richard Grondin  
**Date:** 2026-01-21

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**