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 |
|---|---|---|---|---|
| Yuping Huang | 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 |
| Kenneth Griffin | 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 |
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 |
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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.