SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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SCHEDULE 13D

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(a) AND
AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a)

Under the Securities Exchange Act of 1934

(Amendment No. 2)*

Perma-Fix Environmental Services, Inc.

(Name of Issuer)

Common Stock, $0.001 Par Value Per Share

(Title of Class of Securities)

 714157203

(CUSIP Number)

with a copy to

Derek D. Bork

Thompson Hine LLP

3900 Key Center

127 Public Square

Cleveland, Ohio 44114

(216) 566-5500

(Name, Address and Telephone Number of Person Authorized

to Receive Notices and Communications)

December 10, 2019

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), 13d-1(f), or 13d-1(g), check the following box ¨

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See § 240.13d-7 for other parties to whom copies are to be sent.

__________________

*The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

This Amendment No. 2 to Statement of Beneficial Ownership on Schedule 13D (this “Amendment No. 2”) amends the Statement of Beneficial Ownership on Schedule 13D filed by the Reporting Persons on March 27, 2017 (as amended, the “Schedule 13D” or this “Statement”), with respect to the Common Stock, par value $0.001 per share (the “Common Stock”), of Perma-Fix Environmental Services, Inc., a Delaware corporation (the “Company”). Except as amended and supplemented by this Amendment No. 2, the Schedule 13D remains unchanged.

Item 5. Interest in Securities of the Issuer.

(a) The Reporting Persons beneficially own in the aggregate 579,114 shares of Common Stock, which represents approximately 4.8% of the Company’s outstanding shares of Common Stock.

The Fund directly holds the number and percentage of shares of Common Stock disclosed as beneficially owned by it in the applicable table set forth on the cover page to this Statement. None of the other Reporting Persons directly hold any of the shares of Common Stock disclosed in this Statement.

Each percentage ownership of shares of Common Stock set forth in this Statement is based on the 12,083,478 shares of Common Stock reported by the Company as outstanding as of November 4, 2019 in its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 7, 2019.

The GP, as general partner of the Fund, and Mr. Putnam, as managing member of the GP, may be deemed to have indirect beneficial ownership of the shares of Common Stock beneficially owned by the Fund. The GP and Mr. Putnam disclaim beneficial ownership of such shares for all other purposes.

(c) The transactions effected by the Reporting Persons in the Common Stock during the past 60 days are set forth on Schedule A to this Statement. Each of these transactions was effected through the open market.

(e) As of December 10, 2019, the Reporting Persons ceased to be the beneficial owners of more than five percent of Common Stock.

Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.

Pursuant to Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the Reporting Persons have entered into an agreement with respect to the joint filing of this Amendment No. 2, which agreement is set forth on the signature page to this Statement.

Signature

After reasonable inquiry and to the best of each of the undersigned’s knowledge and belief, each of the undersigned certifies that the information set forth in this Statement is true, complete and correct.

In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of this Statement on Schedule 13D with respect to the Common Stock of the Company.

Schedule A

Transactions by the Fund in the Common Stock in the past 60 days: