Perma Fix Environmental Services Inc
PESI- Exchange
- Nasdaq
- Industry
- Hazardous Waste Management
- SEC CIK
- 0000891532
No open-market purchases or sales by Perma Fix Environmental Services Inc insiders were filed in the last 90 days; 88 institutions reported holding it in 13F filings for Q2 2026, worth $135.2M in total; no superinvestor holds it.
Holders of 5% or more of PESI
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Perma Fix Environmental Services Inc, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| HOLD Alapkezelo Zrt. | 13G/A | 10.60%2.25M shares | +5.50 ppfrom 5.10% | Mar 30, 20262 filings | Aug 27, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
10 Schedule 13D and 13G filings on Perma Fix Environmental Services Inc, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Aug 28, 20262:31 PM ET | Mak Capital One LLCand 2 others | 13G/A | 4.80%1.02M shares | −0.70 ppfrom 5.50%Below 5% | Aug 24, 2026 | SEC |
| Aug 27, 20269:37 AM ET | HOLD Alapkezelo Zrt. | 13G/A | 10.60%2.25M shares | +5.50 ppfrom 5.10% | Aug 25, 2026 | SEC |
| Aug 7, 20264:48 PM ET | Mak Capital One LLCand 2 others | 13G/A | 5.50%1.16M shares | 0.00 ppfrom 5.50% | Jul 31, 2026 | SEC |
| Aug 6, 20266:10 PM ET | Mak Capital One LLCand 2 others | 13G | 5.50%1.16M shares | New | Jul 31, 2026 | SEC |
| Mar 30, 20269:57 AM ET | HOLD Alapkezelo Zrt. | 13G | 5.10%944.3K shares | New | Mar 31, 2026 | SEC |
| Mar 27, 202611:18 AM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | −5.06 ppfrom 5.06%Below 5% | Mar 13, 2026 | SEC |
| Oct 30, 20253:50 PM ET | Vanguard Group Inc | 13G | 5.06%935.9K shares | New | Sep 30, 2025 | SEC |
| Nov 16, 2021 | Heartland Advisors Inc | 13D/AOld format | – | – | – | SEC |
| Sep 14, 2021 | Heartland Advisors Inc | 13D/AOld format | – | – | – | SEC |
| Jan 13, 2021 | Heartland Advisors Inc | 13D/AOld format | – | – | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Perma Fix Environmental Services Inc shares.
No Form 144 notices for Perma Fix Environmental Services Inc are on file.