As of November 6, 2026, one holder's latest Schedule 13D or 13G filing report owning 5% or more of Perma Fix Environmental Services Inc. The largest reported stake is HOLD Alapkezelo Zrt.'s, at 15.2%. 8 filings are on record since October 30, 2025 (Schedule 13G/A, October 28, 2026).
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Key facts
- · Reporting person: HOLD Alapkezelo Zrt. · Sole voting: 3,216,097 · Shared voting: 0 · Sole dispositive: 3,216,097 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-10-28
- · Reporting person: Mak Capital One LLC · Sole voting: 0 · Shared voting: 1,016,047 · Sole dispositive: 0 · Shared dispositive: 1,016,047 · SCHEDULE 13G/A, 2026-08-28
- · Holder: HOLD Alapkezelo Zrt. · Percent: 10.6% · SCHEDULE 13G/A
- · Holder: MAK Capital Fund LP · Percent: 5.5% · SCHEDULE 13G/A
- · Holder: MAK Capital Fund LP · Percent: 5.5% · SCHEDULE 13G
Perma Fix Environmental Services Inc has 8 Schedule 13D or 13G filings on record since 2025-10-30. 1 holder's latest filing reports 5% or more of common shares. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 15.2% | 3,216,097 | SCHEDULE 13G/A, 2026-10-28 | 2026-10-27 | |
| Mak Capital One LLC | 4.8% | 1,016,047 | SCHEDULE 13G/A, 2026-08-28 | 2026-08-24 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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Keep reading
More on Perma Fix Environmental Services Inc and the records around it.
Perma Fix Environmental Services Inc elsewhere on the record
Companies that share a holder
- HOLD Alapkezelo Zrt. also filed stake reports on 2 other companies: Protalix BioTherapeutics, Inc. (Oct 2026), MediWound Ltd. (Aug 2026)
- MAK Capital Fund LP also filed stake reports on 3 other companies: STANDARD BIOTOOLS INC. (Aug 2026), ClearPoint Neuro, Inc. (Aug 2026), HEIDRICK & STRUGGLES INTERNATIONAL INC (Nov 2025)
- The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)
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What the Full Report on Perma Fix Environmental Services Inc covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| HOLD Alapkezelo Zrt. | 3,216,097 | 0 | 3,216,097 | 0 | SCHEDULE 13G/A, 2026-10-28 |
| Mak Capital One LLC | 0 | 1,016,047 | 0 | 1,016,047 | SCHEDULE 13G/A, 2026-08-28 |
| MAK Capital Fund LP | 0 | 1,016,047 | 0 | 1,016,047 | SCHEDULE 13G/A, 2026-08-28 |
| Kaufman Michael A | 0 | 1,016,047 | 0 | 1,016,047 | SCHEDULE 13G/A, 2026-08-28 |
The latest filing identifies Perma Fix Environmental Services Inc by CUSIP 714157203 and gives its principal executive office as 8302 DUNWOODY PLACE, SUITE 250, ATLANTA, GA 30350 (SCHEDULE 13G/A, 2026-10-28).
What the percentages are based on
4.8% The calculation is based upon 1,016,047 shares of Common Stock beneficially owned as of 08/28/2026 and a total of 21,218,351 shares of Common Stock, $0.001 par value per share, outstanding as of August 7, 2026, as reported by the Issuer in its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 12, 2026.Mak Capital One LLC, SCHEDULE 13G/A, 2026-08-28
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-10-30 | The Vanguard Group | 5.06% | SCHEDULE 13G |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-03-30 | HOLD Alapkezelo Zrt. | 5.1% | SCHEDULE 13G |
| 2026-08-06 | MAK Capital Fund LP | 5.5% | SCHEDULE 13G |
| 2026-08-07 | MAK Capital Fund LP | 5.5% | SCHEDULE 13G/A |
| 2026-08-27 | HOLD Alapkezelo Zrt. | 10.6% | SCHEDULE 13G/A |
| 2026-08-28 | Mak Capital One LLC | 4.8% | SCHEDULE 13G/A |
| 2026-10-28 | HOLD Alapkezelo Zrt. | 15.2% | SCHEDULE 13G/A |
Questions about who owns Perma Fix Environmental Services Inc
Who owns Perma Fix Environmental Services Inc?
On this page, one holder's latest ownership filing reports 5% or more of Perma Fix Environmental Services Inc: HOLD Alapkezelo Zrt. (15.2%, Schedule 13G/A, filed 2026-10-28).
When did HOLD Alapkezelo Zrt. buy into Perma Fix Environmental Services Inc?
The filings give report dates, not purchase dates. The earliest filing from HOLD Alapkezelo Zrt. on this page is the Schedule 13G, filed 2026-03-30, reporting 5.1%; its latest, Schedule 13G/A filed 2026-10-28, reports 15.2%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 8 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.