As of November 6, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of Quantum Computing Inc. The largest reported stake is Yuping Huang's, at 10.33%. 7 filings are on record since July 29, 2025 (Schedule 13D/A, May 28, 2026).
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Key facts
- · Holder: Yuping Huang · Percent: 10.33% · SCHEDULE 13D/A
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
- · Holder: The Vanguard Group · Percent: 7.51% · SCHEDULE 13G/A
- · Holder: BlackRock, Inc. · Percent: 6.7% · SCHEDULE 13G/A
- · Holder: BlackRock, Inc. · Percent: 5.4% · SCHEDULE 13G
Quantum Computing Inc. has 7 Schedule 13D or 13G filings on record since 2025-07-29. 2 holders' latest filing reports 5% or more of common stock, par value $0.0001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 10.33% | 23,302,068 | SCHEDULE 13D/A, 2026-05-28 | 2023-04-03 | |
| BlackRock, Inc. | 6.7% | 15,045,407 | SCHEDULE 13G/A, 2026-01-21 | 2025-12-31 |
| 4.9% | 9,244,939 | SCHEDULE 13G, 2025-10-02 | 2025-09-25 | |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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More on Quantum Computing Inc. and the records around it.
Quantum Computing Inc. elsewhere on the record
Companies that share a holder
- Citadel Advisors LLC also filed stake reports on 58 other companies: Quantinuum Inc. (Oct 2026), REALLOYS INC. (Oct 2026), STARFIGHTERS SPACE, INC. (Oct 2026)
- BlackRock, Inc. also filed stake reports on 1596 other companies: AvePoint, Inc. (Nov 2026), BIOMARIN PHARMACEUTICAL INC (Nov 2026), MSG RANGERS CORP (Nov 2026)
- 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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Purpose of Transaction (Item 4)
Yuping Huang
Except as described in this Item 4, Dr. Huang has no present plans or proposals that relate to or would result in any of the matters set forth in subparagraphs (a)-(j) of Item 4 of Form Schedule 13D. Dr. Huang reserves the right, in light of his future evaluation of the Issuer's financial condition, business, operations and prospects, the market price of the Common Stock, conditions in the securities markets generally, general economic and industry conditions and other relevant factors, to change his plans and intentions at any time and from time to time, as he deems appropriate. In his capacity as a director and senior executive officer of the Issuer, Dr. Huang participates in deliberations of the Issuer's senior management and directors in the normal course of the Issuer's business that could involve any of the matters set forth in subparagraphs (a)-(j) of the instructions to Item 4 from time to time, and, consistent with his fiduciary duties as an officer, may make proposals or recommendations to the Issuer's board of directors that could involve such matters from time to time. In addition, as a member of the Issuer's senior management, Dr. Huang participates in Issuer compensatory plans, including plans pursuant to which awards of equity securities are made (including, from time to time, to Dr. Huang), in the ordinary course of business, generally on an annual basis.Item 4 of the SCHEDULE 13D/A filed 2026-05-28
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-29 | The Vanguard Group | 6.39% | SCHEDULE 13G |
| 2025-10-02 | Kenneth Griffin | 4.9% | SCHEDULE 13G |
| 2025-10-17 | BlackRock, Inc. | 5.4% | SCHEDULE 13G |
| 2026-01-21 | BlackRock, Inc. | 6.7% | SCHEDULE 13G/A |
| 2026-01-30 | The Vanguard Group | 7.51% | SCHEDULE 13G/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-05-28 | Yuping Huang | 10.33% | SCHEDULE 13D/A |
Questions about who owns Quantum Computing Inc.
Who owns Quantum Computing Inc.?
On this page, 2 holders' latest ownership filings report 5% or more of Quantum Computing Inc.: Yuping Huang (10.33%, Schedule 13D/A, filed 2026-05-28) and BlackRock, Inc. (6.7%, Schedule 13G/A, filed 2026-01-21).
Who are the largest shareholders of Quantum Computing Inc.?
By the share each holder's latest filing reports, the largest holders of Quantum Computing Inc. on this page are Yuping Huang (10.33%) and BlackRock, Inc. (6.7%).
When did Yuping Huang buy into Quantum Computing Inc.?
The filings give report dates, not purchase dates. The earliest filing from Yuping Huang on this page is the Schedule 13D/A, filed 2026-05-28, reporting 10.33%. That earliest filing is itself an amendment, which updates an earlier report.
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 Computing Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| July 22, 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.