As of November 6, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of Quantum Cyber N.V. The largest reported stake is Lazar David E.'s, at 94.3%. 7 filings are on record since August 14, 2025 (Schedule 13D/A, August 7, 2026).
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Key facts
- · Reporting person: BP United Inc. · Sole voting: 0 · Shared voting: 2,174,834 · Sole dispositive: 0 · Shared dispositive: 2,174,834 · SCHEDULE 13G, 2026-08-10
- · Reporting person: Lazar David E. · Sole voting: 477,000,000 · Shared voting: 0 · Sole dispositive: 477,000,000 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-08-07
- · Holder: Lazar David E. · Percent: 97.4% · SCHEDULE 13D
- · Reporting person: Armistice Capital, LLC · Sole voting: 0 · Shared voting: 435,128 · Sole dispositive: 0 · Shared dispositive: 435,128 · SCHEDULE 13G/A, 2026-02-17
- · Holder: Donahue Kevin Michael · Percent: 10.7% · SCHEDULE 13G/A
Quantum Cyber N.V. has 7 Schedule 13D or 13G filings on record since 2025-08-14. 3 holders' latest filing reports 5% or more of ordinary shares, nominal value (euro)0.01 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 94.3% | 477,000,000 | SCHEDULE 13D/A, 2026-08-07 | 2026-08-05 | |
| 10.7% | 685,000 | SCHEDULE 13G/A, 2026-01-20 | 2025-10-17 | |
| 9.8% | 2,718,543 | SCHEDULE 13G, 2026-08-10 | 2026-06-03 | |
| Armistice Capital, LLC | 4.99% | 435,128 | SCHEDULE 13G/A, 2026-02-17 | 2025-12-31 |
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More on Quantum Cyber N.V. and the records around it.
Quantum Cyber N.V. elsewhere on the record
Companies that share a holder
- Lazar David E. also filed stake reports on 8 other companies: HIGHWAY HOLDINGS LTD (Nov 2026), Aterian, Inc. (Sep 2026), KALA BIO, Inc. (Jul 2026)
- Armistice Capital, LLC also filed stake reports on 120 other companies: Autolus Therapeutics plc (Aug 2026), Bicycle Therapeutics plc (Aug 2026), BioXcel Therapeutics, Inc. (Aug 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Lazar David E. | 477,000,000 | 0 | 477,000,000 | 0 | SCHEDULE 13D/A, 2026-08-07 |
| BP United Inc. | 0 | 2,174,834 | 0 | 2,174,834 | SCHEDULE 13G, 2026-08-10 |
| Alexander Gurevich | 543,709 | 2,174,834 | 543,709 | 2,174,834 | SCHEDULE 13G, 2026-08-10 |
| Armistice Capital, LLC | 0 | 435,128 | 0 | 435,128 | SCHEDULE 13G/A, 2026-02-17 |
| Steven Boyd | 0 | 435,128 | 0 | 435,128 | SCHEDULE 13G/A, 2026-02-17 |
The latest filing identifies Quantum Cyber N.V. by CUSIP N5436L119 and gives its principal executive office as 200 Connecticut Ave, Suite 400, Norwalk, CT 06854 (SCHEDULE 13G, 2026-08-10).
Source of funds (Item 3)
Item 3 of the Schedule 13D is hereby amended and supplemented as follows: "On August 5, 2026, the Reporting Person converted (i) 1,000,000 Series A Preferred Shares of the Issuer into 9,000,000 Ordinary Shares of the Issuer, (ii) 1,000,000 Series B Preferred Shares of the Issuer into 9,000,000 Ordinary Shares of the Issuer, (iii) 1,000,000 Series C Preferred Shares of the Issuer into 9,000,000 Ordinary Shares of the Issuer, and (iv) 124,700 Series D Preferred Shares of the Issuer into 28,057,500 Ordinary Shares of the Issuer (each of the foregoing for no additional consideration)."Lazar David E., SCHEDULE 13D/A, 2026-08-07
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-14 | Armistice Capital, LLC | 9.99% | SCHEDULE 13G/A |
| 2026-01-16 | Donahue Kevin Michael | 10.7% | SCHEDULE 13G |
| 2026-01-20 | Donahue Kevin Michael | 10.7% | SCHEDULE 13G/A |
| 2026-02-17 | Armistice Capital, LLC | 4.99% | SCHEDULE 13G/A |
| 2026-04-28 | Lazar David E. | 97.4% | SCHEDULE 13D |
| 2026-08-07 | Lazar David E. | 94.3% | SCHEDULE 13D/A |
| 2026-08-10 | Alexander Gurevich | 9.8% | SCHEDULE 13G |
Questions about who owns Quantum Cyber N.V.
Who owns Quantum Cyber N.V.?
On this page, 3 holders' latest ownership filings report 5% or more of Quantum Cyber N.V.: Lazar David E. (94.3%, Schedule 13D/A, filed 2026-08-07), Donahue Kevin Michael (10.7%, Schedule 13G/A, filed 2026-01-20) and Alexander Gurevich (9.8%, Schedule 13G, filed 2026-08-10).
Who are the largest shareholders of Quantum Cyber N.V.?
By the share each holder's latest filing reports, the largest holders of Quantum Cyber N.V. on this page are Lazar David E. (94.3%), Donahue Kevin Michael (10.7%) and Alexander Gurevich (9.8%).
When did Lazar David E. buy into Quantum Cyber N.V.?
The filings give report dates, not purchase dates. The earliest filing from Lazar David E. on this page is the Schedule 13D, filed 2026-04-28, reporting 97.4%; its latest, Schedule 13D/A filed 2026-08-07, reports 94.3%.
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%); 7 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.
Also on the record for Quantum Cyber N.V.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| October 16, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| May 18, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| April 28, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
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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.