Latest Period
Q2 2026
Security Snapshot
MIAMI INTERNATIONAL HOLDINGS, INC. - COMMON STOCK (MIAX) Institutional Ownership
CUSIP: 59356Q108
13F Institutional Holders and Ownership History from Q3 2025 to Q2 2026
Institutions Reporting
205
Shares (Excl. Options)
72,114,375
Price
$37.16
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- Security type / class
- Equity / COMMON STOCK
- Symbol
- MIAX on NYSE
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 72,114,375
- Total 13F value
- $2,681,361,422
- Portfolio coverage rank
- 0.01%
- Share change
- +22,076,176
- Value change
- +$810,986,330
- Number of holders
- 205
- Shares outstanding
- 94,961,698
- SEC-reported price per share
- $46.20
- Insider filing price
- $46.20
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.
- 205 institutions reported positions in Q2 2026.
- 4 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 199 to 205 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $1,948,044,705 to $2,681,361,422.
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 205 institutions filings for Q2 2026.
Security key
59356Q108
Latest holder period
Q2 2026
13F holders
205
13D/G owners
4
CIK / CUSIP context first
Open Q2 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
4
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 |
| T. Rowe Price Investment Management, Inc. | 5.3% | $216,367,380 | 5,032,970 | T. Rowe Price Investment Management, Inc. | 30 Jun 2026 | |||
| BlackRock, Inc. | 5.1% | $183,941,628 | 4,949,990 | BlackRock, Inc. | 30 Jun 2026 | |||
| Gallagher Thomas P. | 4.9% | -4% | 4,036,237 | -4.5% | Thomas P. Gallagher | 26 Aug 2025 |
As of 30 Jun 2026, 205 institutional investors reported holding 72,114,375 shares of MIAMI INTERNATIONAL HOLDINGS, INC. - COMMON STOCK (MIAX). This represents 76% of the company’s total 94,961,698 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
54%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| HORIZON KINETICS ASSET MANAGEMENT LLC | 8.3% | 7,842,173 | +127% | 3.3% | $291,415,166 |
| BlackRock, Inc. | 5.3% | 5,071,754 | +127% | 0% | $188,466,378 |
| T. Rowe Price Investment Management, Inc. | 5.3% | 5,032,970 | +21% | 0.12% | $187,026,000 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 4% | 3,786,418 | +175% | 0.01% | $140,703,293 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 3.5% | 3,355,043 | +1.8% | 0.11% | $124,673,398 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.3% | 3,165,686 | +124% | 0% | $117,636,892 |
| Invesco Ltd. | 2.1% | 2,020,650 | +27% | 0.01% | $75,087,354 |
| J Digital 6 LLC | 1.9% | 1,807,234 | 40% | $67,156,815 | |
| BLAIR WILLIAM & CO/IL | 1.9% | 1,769,432 | +166% | 0.17% | $65,752,093 |
| Balyasny Asset Management L.P. | 1.8% | 1,682,924 | 0.11% | $62,537,456 | |
| AMERICAN CENTURY COMPANIES INC | 1.7% | 1,587,196 | +30% | 0.03% | $58,980,261 |
| STATE STREET CORP | 1.5% | 1,432,894 | +101% | 0% | $53,246,341 |
| JPMORGAN CHASE & CO | 1.5% | 1,427,881 | +15% | 0% | $52,718,389 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.5% | 1,395,680 | +79% | 0% | $51,869,678 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 1.2% | 1,143,920 | -8.3% | 0.06% | $42,508,067 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 1.1% | 1,039,449 | +333% | 0.06% | $38,625,925 |
| LORD, ABBETT & CO. LLC | 1.1% | 1,000,866 | +16% | 0.11% | $37,192,000 |
| MORGAN STANLEY | 1% | 950,593 | -17% | 0% | $35,324,037 |
| TWO SIGMA INVESTMENTS, LP | 0.94% | 888,109 | -0.63% | 0.02% | $33,002,130 |
| Allspring Global Investments Holdings, LLC | 0.9% | 857,682 | -23% | 0.05% | $33,492,482 |
| BANK OF AMERICA CORP /DE/ | 0.9% | 856,980 | -4.9% | 0% | $31,845,377 |
| Alyeska Investment Group, L.P. | 0.89% | 848,750 | -41% | 0.08% | $31,539,550 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 0.89% | 844,464 | +430% | 0% | $31,381,000 |
| FRANKLIN RESOURCES INC | 0.83% | 784,799 | +38% | 0.01% | $29,163,130 |
| Walleye Capital LLC | 0.77% | 728,034 | +1790% | 0.13% | $27,053,743 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
4
Latest
Q2 2026
Rows shown
1-4 of 4
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 72,114,375 | $2,681,361,422 | +$810,986,330 | $37.16 | 205 |
| 2026 Q1 | 50,070,919 | $1,948,044,705 | +$428,606,917 | $38.92 | 199 |
| 2025 Q4 | 37,336,537 | $1,657,285,443 | +$508,570,468 | $44.38 | 160 |
| 2025 Q3 | 25,501,338 | $1,026,412,421 | +$1,026,412,421 | $40.26 | 114 |