MIAX Miami International Holdings, Inc.
Miami International Holdings, Inc. (MIAX) Institutional Ownership
What the institutions did with MIAX last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| HORIZON KINETICS ASSET MANAGEMENT LLC | 7.8M | 10.8% |
| BlackRock, Inc. | 5.1M | 7.0% |
| T. Rowe Price Investment Management, Inc. | 5.0M | 7.0% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 3.8M | 5.2% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 3.4M | 4.6% |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.2M | 4.4% |
| Invesco Ltd. | 2.0M | 2.8% |
| J Digital 6 LLC | 1.8M | 2.5% |
| BLAIR WILLIAM & CO/IL | 1.8M | 2.4% |
| Balyasny Asset Management L.P. | 1.7M | 2.3% |
| AMERICAN CENTURY COMPANIES INC | 1.6M | 2.2% |
| STATE STREET CORP | 1.4M | 2.0% |
| JPMORGAN CHASE & CO | 1.4M | 2.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 1.4M | 1.9% |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 1.1M | 1.6% |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 1.0M | 1.4% |
| LORD, ABBETT & CO. LLC | 1.0M | 1.4% |
| MORGAN STANLEY | 950.6K | 1.3% |
| TWO SIGMA INVESTMENTS, LP | 888.1K | 1.2% |
| Allspring Global Investments Holdings, LLC | 857.7K | 1.2% |
| BANK OF AMERICA CORP /DE/ | 857.0K | 1.2% |
| Alyeska Investment Group, L.P. | 848.8K | 1.2% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 844.5K | 1.2% |
| FRANKLIN RESOURCES INC | 784.8K | 1.1% |
| Walleye Capital LLC | 728.0K | 1.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| HORIZON KINETICS ASSET MANAGEMENT LLC | Increased | 3.5M | 7.8M | +4.4M |
| BlackRock, Inc. | Increased | 2.2M | 5.1M | +2.8M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 1.4M | 3.8M | +2.4M |
| J Digital 6 LLC | New | 0 | 1.8M | +1.8M |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 1.4M | 3.2M | +1.8M |
| Balyasny Asset Management L.P. | New | 0 | 1.7M | +1.7M |
| CITADEL ADVISORS LLC | Sold Out | 1.6M | 0 | -1.6M |
| BLAIR WILLIAM & CO/IL | Increased | 665.8K | 1.8M | +1.1M |
| T. Rowe Price Investment Management, Inc. | Increased | 4.1M | 5.0M | +887.4K |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | Increased | 240.0K | 1.0M | +799.4K |
| North Reef Capital Management LP | Reduced | 1.0M | 251.4K | -762.9K |
| STATE STREET CORP | Increased | 712.3K | 1.4M | +720.6K |
| WESTFIELD CAPITAL MANAGEMENT CO LP | New | 0 | 700.7K | +700.7K |
| Walleye Capital LLC | Increased | 38.5K | 728.0K | +689.5K |
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 159.2K | 844.5K | +685.3K |
| NewEdge Advisors, LLC | Increased | 39.0K | 681.6K | +642.6K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 779.8K | 1.4M | +615.9K |
| Alyeska Investment Group, L.P. | Reduced | 1.4M | 848.8K | -598.7K |
| Assenagon Asset Management S.A. | New | 0 | 595.7K | +595.7K |
| Ghisallo Capital Management LLC | Reduced | 1.0M | 500.0K | -500.0K |
| Nuveen, LLC | Increased | 231.9K | 668.1K | +436.2K |
| Invesco Ltd. | Increased | 1.6M | 2.0M | +435.6K |
| AMERICAN CENTURY COMPANIES INC | Increased | 1.2M | 1.6M | +365.7K |
| Allianz Asset Management GmbH | New | 0 | 359.3K | +359.3K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 518.7K | 189.1K | -329.6K |
| NORTHERN TRUST CORP | Increased | 234.0K | 562.3K | +328.4K |
| Langdon Equity Partners | New | 0 | 282.5K | +282.5K |
| Nearwater Capital Markets, Ltd | New | 0 | 279.0K | +279.0K |
| Penn Capital Management Company, LLC | Sold Out | 273.8K | 0 | -273.8K |
| RENAISSANCE TECHNOLOGIES LLC | Sold Out | 271.5K | 0 | -271.5K |
| JENNISON ASSOCIATES LLC | New | 0 | 267.3K | +267.3K |
| Woodline Partners LP | Sold Out | 261.1K | 0 | -261.1K |
| TUDOR INVESTMENT CORP ET AL | Sold Out | 259.8K | 0 | -259.8K |
| Allspring Global Investments Holdings, LLC | Reduced | 1.1M | 857.7K | -254.6K |
| SG Americas Securities, LLC | Increased | 3.5K | 242.5K | +239.0K |
| York GP, Ltd. | New | 0 | 230.7K | +230.7K |
| Philadelphia Financial Management of San Francisco, LLC | New | 0 | 223.7K | +223.7K |
| SEI INVESTMENTS CO | Reduced | 526.4K | 307.1K | -219.3K |
| FRANKLIN RESOURCES INC | Increased | 568.2K | 784.8K | +216.6K |
| Trexquant Investment LP | Sold Out | 215.5K | 0 | -215.5K |
| MAD RIVER INVESTORS | Increased | 81.3K | 289.0K | +207.8K |
| BlueCrest Capital Management Ltd | New | 0 | 200.0K | +200.0K |
| MORGAN STANLEY | Reduced | 1.1M | 950.6K | -196.4K |
| JPMORGAN CHASE & CO | Increased | 1.2M | 1.4M | +189.9K |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | 444.9K | 262.2K | -182.7K |
| Delta Global Management LP | Reduced | 287.7K | 109.7K | -178.0K |
| BNP PARIBAS FINANCIAL MARKETS | Reduced | 572.5K | 394.7K | -177.8K |
| INTRINSIC EDGE CAPITAL MANAGEMENT LLC | Reduced | 276.0K | 106.0K | -170.0K |
| Driehaus Capital Management LLC | Increased | 396.7K | 566.1K | +169.4K |
| MARSHALL WACE, LLP | Increased | 122.6K | 287.5K | +164.9K |
| AXIOM INVESTORS LLC /DE | Sold Out | 163.3K | 0 | -163.3K |
| Hudson Bay Capital Management LP | Increased | 29.6K | 190.2K | +160.6K |
| Caprock Group, LLC | Increased | 100.6K | 259.9K | +159.3K |
| NEW YORK STATE COMMON RETIREMENT FUND | Reduced | 179.0K | 26.9K | -152.1K |
| OCCUDO QUANTITATIVE STRATEGIES LP | Sold Out | 151.7K | 0 | -151.7K |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | New | 0 | 151.2K | +151.2K |
| UBS Group AG | Increased | 423.4K | 567.8K | +144.4K |
| ROYCE & ASSOCIATES LP | Increased | 309.3K | 452.8K | +143.5K |
| Bank of New York Mellon Corp | Increased | 78.0K | 220.4K | +142.4K |
| XTX Topco Ltd | Increased | 29.2K | 170.9K | +141.7K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.