Latest Period
Q1 2026
Security Snapshot
MIAMI INTERNATIONAL HOLDINGS, INC. - Common Stock (MIAX) Institutional Ownership
CUSIP: 59356Q108
13F Institutional Holders and Ownership History from Q3 2025 to Q1 2026
Institutions Reporting
198
Shares (Excl. Options)
50,046,419
Price
$38.92
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- Security type / class
- Equity / Common Stock
- Symbol
- MIAX on NYSE
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 50,046,419
- Total 13F value
- $1,947,091,165
- Portfolio coverage rank
- 0%
- Share change
- +11,262,906
- Value change
- +$428,085,389
- Number of holders
- 198
- Shares outstanding
- 94,875,846
- SEC-reported price per share
- $47.71
- Insider filing price
- $47.71
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- MIAX - MIAMI INTERNATIONAL HOLDINGS, INC. - Common Stock is tracked under CUSIP 59356Q108.
- 198 institutions reported positions in Q1 2026.
- 2 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 160 to 198 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $1,657,285,443 to $1,947,091,165.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 198 institutions filings for Q1 2026.
Security key
59356Q108
Latest holder period
Q1 2026
13F holders
198
13D/G owners
2
CIK / CUSIP context first
Open Q1 2026 holders
MIAX full holder history
MIAMI INTERNATIONAL HOLDINGS, INC. SEC filings
MIAMI INTERNATIONAL HOLDINGS, INC. company facts
MIAMI INTERNATIONAL HOLDINGS, INC. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 59356Q108:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
2
Security
MIAX
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| HORIZON KINETICS ASSET MANAGEMENT LLC | 7.8% | -37% | $350,034,947 | -$177,965,919 | 7,400,316 | -34% | HORIZON KINETICS ASSET MANAGEMENT LLC | 19 May 2026 |
| Gallagher Thomas P. | 4.9% | -4% | 4,036,237 | -4.5% | Thomas P. Gallagher | 26 Aug 2025 |
As of 31 Mar 2026, 198 institutional investors reported holding 50,046,419 shares of MIAMI INTERNATIONAL HOLDINGS, INC. - Common Stock (MIAX). This represents 53% of the company’s total 94,875,846 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
37%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| T. Rowe Price Investment Management, Inc. | 4.4% | 4,145,618 | +37% | 0.11% | $161,348,000 |
| HORIZON KINETICS ASSET MANAGEMENT LLC | 3.6% | 3,451,549 | +90% | 1.5% | $134,334,287 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 3.5% | 3,296,346 | +0.35% | 0.17% | $128,293,786 |
| BlackRock, Inc. | 2.4% | 2,232,680 | +27% | 0% | $86,895,907 |
| CITADEL ADVISORS LLC | 1.7% | 1,607,780 | +159% | 0.04% | $62,574,797 |
| Invesco Ltd. | 1.7% | 1,585,003 | +24% | 0.01% | $61,688,317 |
| Alyeska Investment Group, L.P. | 1.5% | 1,447,454 | +13% | 0.16% | $56,334,910 |
| VANGUARD CAPITAL MANAGEMENT LLC | 1.5% | 1,414,979 | 0% | 0% | $55,070,983 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 1.4% | 1,374,946 | 0% | 0% | $53,512,898 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 1.3% | 1,246,999 | +41% | 0.07% | $48,533,201 |
| JPMORGAN CHASE & CO | 1.3% | 1,238,006 | +52% | 0% | $46,425,226 |
| AMERICAN CENTURY COMPANIES INC | 1.3% | 1,221,485 | -16% | 0.02% | $47,540,254 |
| MORGAN STANLEY | 1.2% | 1,146,956 | +419% | 0% | $44,639,528 |
| Allspring Global Investments Holdings, LLC | 1.2% | 1,112,261 | +19% | 0.07% | $43,789,716 |
| North Reef Capital Management LP | 1.1% | 1,014,274 | -20% | 1.4% | $39,475,544 |
| Ghisallo Capital Management LLC | 1.1% | 1,000,000 | +79% | 1.1% | $38,920,000 |
| BANK OF AMERICA CORP /DE/ | 0.95% | 900,882 | +196% | 0% | $35,062,327 |
| TWO SIGMA INVESTMENTS, LP | 0.94% | 893,718 | +537% | 0.03% | $34,783,505 |
| LORD, ABBETT & CO. LLC | 0.91% | 860,687 | +30% | 0.11% | $33,498,000 |
| GEODE CAPITAL MANAGEMENT, LLC | 0.82% | 779,782 | +52% | 0% | $30,355,168 |
| STATE STREET CORP | 0.75% | 712,329 | +24% | 0% | $27,723,845 |
| BLAIR WILLIAM & CO/IL | 0.7% | 665,781 | +1.7% | 0.07% | $25,912,197 |
| Caldwell Investment Management Ltd. | 0.7% | 663,810 | -10% | 9.8% | $24,923,158 |
| BNP PARIBAS FINANCIAL MARKETS | 0.6% | 572,456 | 0% | 0.01% | $22,279,988 |
| FRANKLIN RESOURCES INC | 0.6% | 568,174 | +33% | 0.01% | $22,113,329 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
3
Latest
Q1 2026
Rows shown
1-3 of 3