As of November 6, 2026, Miami International Holdings, Inc. is a publicly traded company (NYSE: MIAX). The largest holder reporting an active stake on Schedule 13D is Horizon Kinetics Asset Management LLC, at 7.8%. No bankruptcy or receivership appears in its SEC Form 8-K filings. Passive holders reporting on Schedule 13G include BlackRock (6.2%), T. Rowe Price (5.3%) (Schedule 13D/A, May 21, 2026).
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Is Miami International Holdings, Inc. a real, registered company?
- Miami International Holdings Inc files with the SEC under CIK 1438472 (its SEC filings).
- Its shares are listed under the ticker MIAX on NYSE (SEC company record).
- Incorporated in Delaware; business address in Princeton, New Jersey, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under MIAMI INTERNATIONAL HOLDINGS INC in our court records and SEC 8-K records (as of 2026-11-06).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names BlackRock (filed 2026-10-27).
Who are Miami International Holdings, Inc.'s owners and officers?
Miami International Holdings, Inc.: incorporated in Delaware; business address in Princeton, New Jersey; industry Security Brokers, Dealers & Flotation Companies (Schedule 13G/A, 2026-10-27).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-10-27 | Blackrock, Inc. | 6.2% |
| Schedule 13G, 2026-08-14 | T. Rowe Price Investment Management, Inc. | 5.3% |
| Schedule 13G, 2026-07-29 | Blackrock, Inc. | 5.1% |
| Schedule 13D/A, 2026-05-21 | Horizon Kinetics Asset Management LLC | 7.8% |
| Schedule 13D/A, 2026-04-28 | Horizon Kinetics Asset Management LLC | 12.2% |
| Schedule 13D/A, 2026-04-14 | Horizon Kinetics Asset Management LLC | 12.1% |
| Schedule 13D/A, 2025-11-26 | Horizon Kinetics Asset Management LLC | 11.7% |
| Schedule 13D/A, 2025-08-28 | Thomas P. Gallagher | 4.9% |
| Schedule 13D, 2025-08-21 | Thomas P. Gallagher | 5.1% |
| Schedule 13D, 2025-08-21 | Horizon Kinetics Asset Management LLC | 10.7% |
Questions about who owns Miami International Holdings, Inc.
Who owns Miami International Holdings, Inc.?
On this page, 3 holders' latest ownership filings report 5% or more of Miami International Holdings, Inc.: Horizon Kinetics Asset Management LLC (7.8%, Schedule 13D/A, filed 2026-05-21), Blackrock, Inc. (6.2%, Schedule 13G/A, filed 2026-10-27) and T. Rowe Price Investment Management, Inc. (5.3%, Schedule 13G, filed 2026-08-14).
Who are the largest shareholders of Miami International Holdings, Inc.?
By the share each holder's latest filing reports, the largest holders of Miami International Holdings, Inc. on this page are Horizon Kinetics Asset Management LLC (7.8%), Blackrock, Inc. (6.2%) and T. Rowe Price Investment Management, Inc. (5.3%).
When did Horizon Kinetics Asset Management LLC buy into Miami International Holdings, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Horizon Kinetics Asset Management LLC on this page is the Schedule 13D, filed 2025-08-21, reporting 10.7%; its latest, Schedule 13D/A filed 2026-05-21, reports 7.8%.
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%); 10 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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Which insiders own Miami International Holdings, Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , a director and 10% owner: 4,633,842 shares (4.6% of shares outstanding), held indirectly through Horizon Kinetics Asset Management LLC, on a joint filing (Form 4, 2026-03-06).
- , the chairman and chief executive: 2,209,817 shares (2.2% of shares outstanding), 786,542 held directly and 1,423,275 indirectly (Form 4, 2026-09-04).
- Horizon Kinetics Asset Management LLC, a 10% owner: 2,170,898 shares (2.2% of shares outstanding), held indirectly through Horizon Kinetics Asset Management LLC (Form 4, 2026-05-21).
- , the general counsel and executive vice president: 839,564 shares (0.84% of shares outstanding) (Form 4, 2026-11-04).
- , a director: 534,924 shares (0.53% of shares outstanding), 4,970 held directly and 529,954 indirectly (Form 3, 2026-06-18).
Shares outstanding: 100,056,866 as of 2026-10-26, from the company's latest SEC cover page.
How much has Miami International Holdings, Inc. raised?
Latest IPO step: Miami International Holdings, Inc. filed its final IPO prospectus, ticker MIAX (424B4, 2025-12-15).
IPO filings: 424B4, 2025-12-15, S-1, 2025-12-09, 424B4, 2025-08-14, S-1/A, 2025-08-04, S-1, 2025-07-18; ticker MIAX on New York Stock Exchange.
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More on Miami International Holdings Inc and the records around it.
Miami International Holdings Inc elsewhere on the record
- 5%+ stake filings Oct 2026
- IPO filing Dec 2025
Companies that share a holder
- HORIZON KINETICS ASSET MANAGEMENT LLC also filed stake reports on 13 other companies: LandBridge Co LLC (Nov 2026), EagleRock Land, LLC (Jul 2026), WhiteHawk Minerals Corp. (Jul 2026)
- T. Rowe Price Investment Management, Inc. also filed stake reports on 167 other companies: CABALETTA BIO INC (Nov 2026), MADISON SQUARE GARDEN SPORTS CORP (Nov 2026), MSG RANGERS CORP (Nov 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)
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