Who owns Miami International Holdings, Inc. ?
Institutional ownership of MIAX from SEC Form 13F filings across 150 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
150
13F holders
$1.74B
value, 2026 filers
50.6%
of shares outstanding (49.0M sh)
32
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30· % of fund = share of the manager's own book · % of co. = share of MIAX's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 5.1M | $188.5M | 0.0% | 5.2% | +127.2% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.8M | $140.7M | 0.0% | 3.9% | +175.4% |
| 3 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 3.4M | $124.7M | 0.0% | 3.5% | +1.8% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 3.2M | $117.6M | 0.0% | 3.3% | +11.9% |
| 5 | Invesco Ltd. | 2.0M | $75.1M | 0.0% | 2.1% | +27.5% |
| 6 | BLAIR WILLIAM & CO/IL | 1.8M | $65.8M | 0.2% | 1.8% | +165.8% |
| 7 | Balyasny Asset Management L.P.NEW | 1.7M | $62.5M | 0.1% | 1.7% | new |
| 8 | AMERICAN CENTURY COMPANIES INC | 1.6M | $59.0M | 0.0% | 1.6% | +29.9% |
| 9 | JPMORGAN CHASE & CO | 1.4M | $52.7M | 0.0% | 1.5% | +15.3% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 1.4M | $51.9M | 0.0% | 1.4% | +79.0% |
| 11 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 1.1M | $42.5M | 0.1% | 1.2% | -8.3% |
| 12 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 1.0M | $38.6M | 0.1% | 1.1% | +333.1% |
| 13 | LORD, ABBETT & CO. LLC | 1.0M | $37,192 | 0.1% | 1% | +16.3% |
| 14 | MORGAN STANLEY | 950,593 | $35.3M | 0.0% | 1% | -17.1% |
| 15 | TWO SIGMA INVESTMENTS, LP | 888,109 | $33.0M | 0.0% | 0.9% | -0.6% |
| 16 | Allspring Global Investments Holdings, LLC | 857,682 | $33.5M | 0.1% | 0.9% | -22.9% |
| 17 | BANK OF AMERICA CORP /DE/ | 856,980 | $31.8M | 0.0% | 0.9% | -4.9% |
| 18 | PRICE T ROWE ASSOCIATES INC /MD/ | 844,464 | $31,381 | 0.0% | 0.9% | +430.5% |
| 19 | FRANKLIN RESOURCES INC | 784,799 | $29.2M | 0.0% | 0.8% | +38.1% |
| 20 | Walleye Capital LLC | 728,034 | $27.1M | 0.1% | 0.8% | +845.0% |
| 21 | NewEdge Advisors, LLCNEW | 681,610 | $25.3M | 0.1% | 0.7% | new |
| 22 | Nuveen, LLC | 668,115 | $24.8M | 0.0% | 0.7% | +188.1% |
| 23 | UBS Group AG | 567,797 | $21.1M | 0.0% | 0.6% | +34.1% |
| 24 | NORTHERN TRUST CORP | 562,337 | $20.9M | 0.0% | 0.6% | +140.3% |
| 25 | AMERIPRISE FINANCIAL INC | 559,485 | $20.8M | 0.0% | 0.6% | +9.8% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.