As of November 6, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of Zapata Quantum, Inc. The largest reported stake is Sumit Kapur's, at 21.2%. 7 filings are on record since August 21, 2025 (Schedule 13D/A, May 4, 2026).
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Key facts
- · Reporting person: Sumit Kapur · Sole voting: 37,595,833 · Shared voting: 0 · Sole dispositive: 37,595,833 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-05-04
- · Reporting person: Clark Golestani · Sole voting: 36,820,792 · Shared voting: 0 · Sole dispositive: 36,820,792 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-05-04
- · Holder: Andretti Autosport Holding Company, LLC · Percent: 5.8% · Shares: 9,479,000 · SCHEDULE 13G
- · Holder: Clark Golestani · Percent: 22.5% · SCHEDULE 13D/A
- · Holder: Sumit Kapur · Percent: 22.6% · SCHEDULE 13D/A
Zapata Quantum, Inc. has 7 Schedule 13D or 13G filings on record since 2025-08-21. 3 holders' latest filing reports 5% or more of common stock, $0.0001 par value. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 21.2% | 37,595,833 | SCHEDULE 13D/A, 2026-05-04 | 2026-05-01 | |
| 20.9% | 36,820,792 | SCHEDULE 13D/A, 2026-05-04 | 2026-05-01 | |
| Andretti Autosport Holding Company, LLC | 5.8% | 9,479,000 | SCHEDULE 13G, 2025-12-05 | 2025-12-05 |
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More on Zapata Quantum, Inc. and the records around it.
Zapata Quantum, Inc. elsewhere on the record
- Company profile and every filing Apr 2026
- Form D filing Apr 2026
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Sumit Kapur | 37,595,833 | 0 | 37,595,833 | 0 | SCHEDULE 13D/A, 2026-05-04 |
| Clark Golestani | 36,820,792 | 0 | 36,820,792 | 0 | SCHEDULE 13D/A, 2026-05-04 |
| Andretti Autosport Holding Company, LLC | 9,479,000 | 0 | 9,479,000 | 0 | SCHEDULE 13G, 2025-12-05 |
The latest filing identifies Zapata Quantum, Inc. by CUSIP 98906V100 and gives its principal executive office as 6 Liberty Square, #2488, Boston, MA 02109 (SCHEDULE 13D/A, 2026-05-04).
Source of funds (Item 3)
On October 9, 2025, the Reporting Person received (i) 1,000,000 stock options, vesting in equal monthly increments over two years, with the first vesting date to occur on November 9, 2025, subject to continued services as a director with the Company as of each applicable vesting date and (ii) 5,000,000 stock options, vesting in equal monthly installments over four years, subject to continued employment with the Company as of each applicable vesting date.Sumit Kapur, SCHEDULE 13D/A, 2026-05-04
On October 9, 2025, the Reporting Person received 1,000,000 stock options, vesting in equal monthly increments over two years, with the first vesting date to occur on November 9, 2025, subject to vesting conditions.Clark Golestani, SCHEDULE 13D/A, 2026-05-04
Purpose of Transaction (Item 4)
Sumit Kapur
The Reporting Person is the Chief Executive Officer, Chief Financial Officer and Director of the Issuer. He acquired all of his securities with the purpose of exercising control.Item 4 of the SCHEDULE 13D/A filed 2026-05-04
Clark Golestani
The Reporting Person is a director of the Issuer. He acquired all of his securities with the purpose of exercising control.Item 4 of the SCHEDULE 13D/A filed 2026-05-04
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-21 | Sumit Kapur | 22.5% | SCHEDULE 13D |
| 2025-08-21 | Clark Golestani | 22.6% | SCHEDULE 13D |
| 2025-10-23 | Clark Golestani | 22.5% | SCHEDULE 13D/A |
| 2025-10-23 | Sumit Kapur | 22.6% | SCHEDULE 13D/A |
| 2025-12-05 | Andretti Autosport Holding Company, LLC | 5.8% | SCHEDULE 13G |
| 2026-05-04 | Clark Golestani | 20.9% | SCHEDULE 13D/A |
| 2026-05-04 | Sumit Kapur | 21.2% | SCHEDULE 13D/A |
Questions about who owns Zapata Quantum, Inc.
Who owns Zapata Quantum, Inc.?
On this page, 3 holders' latest ownership filings report 5% or more of Zapata Quantum, Inc.: Sumit Kapur (21.2%, Schedule 13D/A, filed 2026-05-04), Clark Golestani (20.9%, Schedule 13D/A, filed 2026-05-04) and Andretti Autosport Holding Company, LLC (5.8%, Schedule 13G, filed 2025-12-05).
Who are the largest shareholders of Zapata Quantum, Inc.?
By the share each holder's latest filing reports, the largest holders of Zapata Quantum, Inc. on this page are Sumit Kapur (21.2%), Clark Golestani (20.9%) and Andretti Autosport Holding Company, LLC (5.8%).
When did Sumit Kapur buy into Zapata Quantum, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Sumit Kapur on this page is the Schedule 13D, filed 2025-08-21, reporting 22.5%; its latest, Schedule 13D/A filed 2026-05-04, reports 21.2%.
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%); 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 Zapata Quantum, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| April 22, 2026 | Form D, private offering | $13.15M sold | Form D page | Source |
| June 25, 2025 | Form D, private offering | $10.10M sold | Form D page | Source |
| June 25, 2025 | Form D, private offering | $3M sold | Form D page | Source |
Zapata Quantum, Inc.: every filing and event
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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.