Perma-Fix Environmental Services Inc. Watch

from 10-K 12 pages Indenture or similar

from 8-K 3 pages First Amendment to Shareholder Rights Agreement

from 10-K 11 pages Common Stock Purchase Warrant to Purchase 60,000 Shares of Common Stock of Perma-Fix Environmental Services, Inc. April 1, 2019

from 8-K 54 pages Perma-Fix Environmental Services, Inc. (Company) and Continental Stock Transfer & Trust Company (Rights Agent) Shareholder Rights Agreement Dated as of May 2, 2018

from 10-Q 2 pages Indenture or similar

from 10-K 2 pages Certain Subparagraphs of the Rights Agreement, Dated May 2, 2008 (The “Rights Agreement”), by and Between Perma-Fix Environmental Services, Inc. (The “Company”) and Continental Stock Transfer & Trust Company (The “Rights Agent”) Were Inadvertently Numbered Incorrectly. This Letter Agreement Changes the Rights Agreement to Correct Such Numbering System Pursuant to the Authority Granted to the Company and the Rights Agent in Section 27 of the Rights Agreement. Effective Upon the Execution of This Letter by the Company and the Rights Agent, the Following Subparagraph Numbers of the Rights Agreement Are Changed as Indicated: 1. Subparagraphs 13(e) and (F) Are Hereby Renumbered 13(a) and (B), Respectfully; 2. Subparagraphs 14(e), (F) and (G) Are Hereby Renumbered 14(a), (B) and (C), Respectfully; 3. Subparagraphs 16(e), (F), (G) and (H) Are Hereby Renumbered 16(a), (B), (C) and (D), Respectfully; 4. Subparagraphs 20(e), (F), (G), (H), (I), (J), (K), (L) and (M) Are Hereby Renumbered 20(a), (B), (C), (D), (E), (F), (G), (H) and (I), Respectfully; 5. Subparagraphs 23(e), (F) and (G) Are Hereby Renumbered 23(a), (B) and (C), Respectfully; 6. Subparagraphs 24(e), (F), (G) and (H) Are Hereby Numbered 24(a), (B), (C) and (D), Respectfully; and 7. Subparagraphs 25(e) and (F) Are Hereby Renumbered 25(a) and (B), Respectfully. Compliance Department Continental Stock Transfer & Trust Company September 29, 2008 Page 2 Except as Expressly Set Forth Above, the Rights Agreement Remains Effective Without Modification. This Letter Agreement May Be Signed in Two Counterparts, Which Together Will Constitute a Single Agreement. Please Indicate Acceptance of the Foregoing by Signing Where Indicated Below. Perma-Fix Environmental Services, Inc. By: /S/Steven Baughman Steven T. Baughman Chief Financial Officer Dated: September 29, 2008 Continental Stock Transfer & Trust Company /S/Alexandra Albrecht Alexandra Albrecht, Vice President and Senior Account Manager Dated: September 29, 2008

from 10-K 71 pages Perma-Fix Environmental Services, Inc. and Continental Stock Transfer & Trust Company (Rights Agent) Rights Agreement Dated as of May 2, 2008

from 8-K 12 pages Indenture or similar

from 10-K/A 4 pages By Electronic Delivery To: Bnaccarato@perma-Fix. Com November 14, 2013 Mr. Ben Naccarato Vice President and Chief Financial Officer Perma-Fix Environmental Services, Inc. 8302 Dunwoody Place, Suite 250 Atlanta, Georgia 30350 Re: Perma-Fix Environmental Services, Inc. (The "Company") NASDAQ Symbol: PESI

from 10-K/A 1 page Indenture or similar

from 10-Q 10 pages Exhibit “C”

from 10-Q 10 pages Exhibit “B”

from 10-Q 2 pages Exhibit “A” Promissory Note

from 10-Q 7 pages Subordination Agreement

from 8-K 6 pages Non-Negotiable Promissory Note

from 8-K 2 pages Exhibit "A" First Amendment to Promissory Note

from 10-K 2 pages Exhiibt 4.3

from 10-Q 1 page Indenture or similar

from 10-Q 14 pages Indenture or similar

from 10-Q 12 pages Indenture or similar