MIAX · Miami International Holdings, Inc. · Shareholders & Ownership
Every disclosed holder of MIAX in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns MIAX
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 71,850,514 | 72.41% |
| Insiders (Forms 3, 4, 5) | 0 | 0.00% |
| 13D/G-only blocks | 4,036,237 | 4.07% |
| Remaining | 23,344,147 | 23.53% |
| Registered funds (N-PORT, not summed) | 28,481,787 | 28.70% |
Shares outstanding: 99,230,898, the issuer's latest cover-page count restated onto today's split basis.
Insiders are listed but not summed: the issuer has more than one class of common stock and Forms 3, 4 and 5 report one issuer-wide balance across them.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of MIAX
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
HORIZON KINETICS ASSET MANAGEMENT LLC
13F
CIK 1056823 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
7,842,173 | ||
| 1.1 |
HORIZON KINETICS ASSET MANAGEMENT LLC
Insider
CIK 1056823 · May 19, 2026
10% Owner, issuer-wide, not summed
|
2,170,898 | ||
| 1.2 |
Horizon Kinetics Inflation Beneficiaries ETF
Fund
S000070458 · Registered fund · Jun 30, 2026
Listed Funds Trust, not summed
|
946,258 | ||
| 1.3 |
Horizon Kinetics Blockchain Development ETF
Fund
S000076848 · Registered fund · Jun 30, 2026
Listed Funds Trust, not summed
|
19,705 | ||
| 2 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,071,754 | ||
| 2.1 |
BlackRock, Inc.
13G
CIK 2012383 · Holding company · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
4,949,990 | ||
| 2.2 |
iShares Russell 2000 ETF
Fund
S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
1,994,266 | ||
| 2.3 |
iShares Russell 2000 Growth ETF
Fund
S000004343 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
706,919 | ||
| 2.4 |
Master Small Cap Index Series
Fund
S000002716 · Registered fund · Jun 30, 2026
Quantitative Master Series LLC, not summed
|
140,013 | ||
| 2.5 |
iShares U.S. Small-Cap Equity Factor ETF
Fund
S000048624 · Registered fund · Jul 31, 2026
iShares Trust, not summed
|
82,657 | ||
| 3 |
T. Rowe Price Investment Management, Inc.
13F
CIK 1897612 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,032,970 | ||
| 3.1 |
T. Rowe Price Investment Management, Inc.
13G
CIK 1897612 · Investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
5,032,970 | ||
| 4 |
STAHL MURRAY
Insider
CIK 1207097 · Mar 5, 2026
Director, CEO and CIO, 10% Owner, issuer-wide, not summed
|
4,633,842 | ||
| 5 |
VANGUARD PORTFOLIO MANAGEMENT LLC
13F
CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,786,418 | ||
| 6 |
SUSQUEHANNA INTERNATIONAL GROUP, LLP
13F
CIK 1446194 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,355,043 | ||
| 7 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,165,686 | ||
| 8 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
2,711,012 | ||
| 9 |
Gallagher Thomas P.
Insider
CIK 2080477 · Sep 3, 2026
Director, Chairman & CEO, issuer-wide, not summed
|
2,209,817 | ||
| 9.1 |
|
4,036,237 | ||
| 10 |
Invesco Ltd.
13F
CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,020,650 | ||
| 10.1 |
Invesco Main Street Small Cap Fund
Fund
S000064650 · Registered fund · Jun 30, 2026
AIM Growth Series (Invesco Growth Series), not summed
|
538,855 | ||
| 10.2 |
Invesco Small Cap Equity Fund
Fund
S000000218 · Registered fund · Jun 30, 2026
AIM Funds Group (Invesco Funds Group), not summed
|
314,296 | ||
| 10.3 |
Invesco V.I. Main Street Small Cap Fund
Fund
S000064664 · Registered fund · Jun 30, 2026
AIM Variable Insurance Funds (Invesco Variable Insurance Funds), not summed
|
301,478 | ||
| 10.4 |
Invesco V.I. Small Cap Equity Fund
Fund
S000000188 · Registered fund · Jun 30, 2026
AIM Variable Insurance Funds (Invesco Variable Insurance Funds), not summed
|
48,822 | ||
| 10.5 |
Invesco Global Small Cap Equity Fund
Fund
S000000212 · Registered fund · Jun 30, 2026
AIM Funds Group (Invesco Funds Group), not summed
|
28,389 | ||
| 11 |
VANGUARD SMALL-CAP INDEX FUND
Fund
S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
1,958,309 | ||
| 12 |
J Digital 6 LLC
13F
CIK 2090663 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,807,234 | ||
| 13 |
BLAIR WILLIAM & CO/IL
13F
CIK 902367 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,769,432 | ||
| 14 |
Balyasny Asset Management L.P.
13F
CIK 1218710 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,682,924 | ||
| 15 |
AMERICAN CENTURY COMPANIES INC
13F
CIK 748054 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,587,196 | ||
| 15.1 |
Small Cap Growth Fund
Fund
S000006193 · Registered fund · Jul 31, 2026
American Century Mutual Funds, Inc., not summed
|
1,353,482 | ||
| 15.2 |
Global Small Cap Fund
Fund
S000053103 · Registered fund · May 31, 2026
American Century World Mutual Funds, Inc., not summed
|
7,710 | ||
| 16 |
|
1,432,894 | ||
| 16.1 |
State Street(R) SPDR(R) S&P(R) Capital Markets ETF
Fund
S000006978 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
163,871 | ||
| 16.2 |
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund
S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
17,900 | ||
| 16.3 |
State Street Institutional Small-Cap Equity Fund
Fund
S000001631 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL FUNDS, not summed
|
5,490 | ||
| 16.4 |
State Street Total Return V.I.S. Fund
Fund
S000001637 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
|
1,933 | ||
| 16.5 |
State Street Small-Cap Equity V.I.S. Fund
Fund
S000001636 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
|
235 | ||
| 17 |
JPMORGAN CHASE & CO
13F
CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,427,881 | ||
| 18 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,395,680 | ||
| 19 |
VANGUARD SMALL-CAP VALUE INDEX FUND
Fund
S000002847 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
1,240,908 | ||
| 20 |
ADAGE CAPITAL PARTNERS GP, L.L.C.
13F
CIK 1165408 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,143,920 | ||
| 21 |
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND
13F
CIK 1535845 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,039,449 | ||
| 22 |
LORD, ABBETT & CO. LLC
13F
CIK 728100 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,000,866 | ||
| 22.1 |
LORD ABBETT DEVELOPING GROWTH FUND INC
Fund
S000006834 · Registered fund · Jul 31, 2026
LORD ABBETT DEVELOPING GROWTH FUND, INC., not summed
|
426,462 | ||
| 22.2 |
Lord Abbett Micro-Cap Growth Fund
Fund
S000007142 · Registered fund · Jul 31, 2026
LORD ABBETT SECURITIES TRUST, not summed
|
59,920 | ||
| 22.3 |
Developing Growth Portfolio
Fund
S000028719 · Registered fund · Jun 30, 2026
LORD ABBETT SERIES FUND INC, not summed
|
17,347 | ||
| 23 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
950,593 | ||
| 23.1 |
E*TRADE No Fee Total Market Index Fund
Fund
S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
|
115 | ||
| 24 |
TWO SIGMA INVESTMENTS, LP
13F
CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
888,109 | ||
| 25 |
Allspring Global Investments Holdings, LLC
13F
CIK 1890906 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
857,682 | ||
| 25.1 |
Allspring SMID Cap Growth Fund
Fund
S000007345 · Registered fund · Jun 30, 2026
ALLSPRING FUNDS TRUST, not summed
|
223,554 | ||
| 25.2 |
Allspring Emerging Growth Fund
Fund
S000015703 · Registered fund · Jul 31, 2026
ALLSPRING FUNDS TRUST, not summed
|
106,577 | ||
| 25.3 |
Allspring VT Small Cap Growth Fund
Fund
S000007228 · Registered fund · Jun 30, 2026
Allspring VARIABLE TRUST, not summed
|
103,946 | ||
| 25.4 |
Allspring VT Discovery SMID Cap Growth Fund
Fund
S000007218 · Registered fund · Jun 30, 2026
Allspring VARIABLE TRUST, not summed
|
43,813 | ||
| 26 |
BANK OF AMERICA CORP /DE/
13F
CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
856,980 | ||
| 27 |
Alyeska Investment Group, L.P.
13F
CIK 1453072 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
848,750 | ||
| 28 |
PRICE T ROWE ASSOCIATES INC /MD/
13F
CIK 80255 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
844,464 | ||
| 28.1 |
T. Rowe Price Small-Cap Stock Fund, Inc.
Fund
S000002120 · Registered fund · Jun 30, 2026
T. ROWE PRICE SMALL-CAP STOCK FUND, INC., not summed
|
1,462,157 | ||
| 28.2 |
T. Rowe Price Institutional Small-Cap Stock Fund
Fund
S000002094 · Registered fund · Jun 30, 2026
T. Rowe Price Equity Funds, Inc., not summed
|
778,478 | ||
| 28.3 |
T. Rowe Price Small-Cap Value Fund, Inc.
Fund
S000002121 · Registered fund · Jun 30, 2026
T. ROWE PRICE SMALL-CAP VALUE FUND, INC., not summed
|
715,840 | ||
| 28.4 |
T. Rowe Price Integrated U.S. Small-Cap Growth Equity Fund
Fund
S000002074 · Registered fund · Jun 30, 2026
T. ROWE PRICE INTEGRATED EQUITY FUNDS, INC., not summed
|
247,000 | ||
| 28.5 |
T. Rowe Price New Horizons Fund, Inc.
Fund
S000002106 · Registered fund · Jun 30, 2026
T. ROWE PRICE NEW HORIZONS FUND, INC., not summed
|
210,800 | ||
| 29 |
Comly Barbara J.
Insider
CIK 2080878 · Sep 2, 2026
EVP, GC & Corporate Secretary, issuer-wide, not summed
|
839,564 | ||
| 30 |
FRANKLIN RESOURCES INC
13F
CIK 38777 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
784,799 | ||
| 30.1 |
Franklin Small Cap Growth Fund
Fund
S000006889 · Registered fund · Jul 31, 2026
Franklin Strategic Series, not summed
|
848,300 | ||
| 30.2 |
Franklin Small Cap Enhanced ETF
Fund
S000097279 · Registered fund · Jun 30, 2026
Franklin Templeton ETF Trust, not summed
|
2,668 | ||
| 31 |
Walleye Capital LLC
13F
CIK 1758720 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
728,034 | ||
| 32 |
WESTFIELD CAPITAL MANAGEMENT CO LP
13F
CIK 1177719 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
700,741 | ||
| 33 |
NewEdge Advisors, LLC
13F
CIK 1633516 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
681,610 | ||
| 34 |
|
668,115 | ||
| 34.1 |
College Retirement Equities Fund - Total Global Stock Account
Fund
S000005080 · Registered fund · Jun 30, 2026
College Retirement Equities Fund, not summed
|
323,754 | ||
| 34.2 |
Nuveen Quant Small/Mid Cap Equity Fund
Fund
S000054623 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
|
141,500 | ||
| 34.3 |
Nuveen Small Cap Blend Index Fund
Fund
S000005367 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
|
97,891 | ||
| 34.4 |
Nuveen Equity Index Fund
Fund
S000005360 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
|
48,146 | ||
| 34.5 |
TIAA Separate Account VA-1 - Stock Index Account
Fund
S000005098 · Registered fund · Jun 30, 2026
TIAA Separate Account VA-1, not summed
|
1,458 | ||
| 35 |
JPMorgan Small Cap Equity Fund
Fund
S000002794 · Registered fund · Jun 30, 2026
JPMorgan Trust I, not summed
|
659,513 | ||
| 36 |
Caldwell Investment Management Ltd.
13F
CIK 1904373 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
600,000 | ||
| 37 |
|
567,797 | ||
| 38 |
Driehaus Capital Management LLC
13F
CIK 938206 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
566,052 | ||
| 38.1 |
Driehaus Micro Cap Growth Fund
Fund
S000042829 · Registered fund · Jun 30, 2026
Driehaus Mutual Funds, not summed
|
89,175 | ||
| 39 |
NORTHERN TRUST CORP
13F
CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
562,337 | ||
| 39.1 |
Small Cap Index Fund
Fund
S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
38,696 | ||
| 39.2 |
Small Cap Core Fund
Fund
S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
7,731 | ||
| 39.3 |
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund
S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
|
3,634 | ||
| 40 |
AMERIPRISE FINANCIAL INC
13F
CIK 820027 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
559,485 | ||
| 40.1 |
Columbia Acorn Fund
Fund
S000009184 · Registered fund · Jun 30, 2026
COLUMBIA ACORN TRUST, not summed
|
467,678 | ||
| 40.2 |
Columbia Variable Portfolio - Acorn Fund
Fund
S000008981 · Registered fund · Jun 30, 2026
COLUMBIA FUNDS VARIABLE SERIES TRUST, not summed
|
90,833 | ||
| 40.3 |
Columbia Research Enhanced Small Cap ETF
Fund
S000095313 · Registered fund · Jun 30, 2026
Columbia ETF Trust I, not summed
|
156 | ||
| 41 |
SEVEN GRAND MANAGERS, LLC
13F
CIK 1909126 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
550,000 | ||
| 42 |
|
534,924 | ||
| 43 |
Ghisallo Capital Management LLC
13F
CIK 1825214 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
500,000 | ||
| 44 |
Clearstead Advisors, LLC
13F
CIK 842775 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
473,937 | ||
| 45 |
ROYCE & ASSOCIATES LP
13F
CIK 906304 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
452,813 | ||
| 45.1 |
Royce Small-Cap Fund
Fund
S000009507 · Registered fund · Jun 30, 2026
ROYCE FUND, not summed
|
200,002 | ||
| 46 |
VICTORY CAPITAL MANAGEMENT INC
13F
CIK 1040188 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
427,425 | ||
| 46.1 |
Victory Pioneer Select Mid Cap Growth Fund
Fund
S000089755 · Registered fund · May 31, 2026
Victory Portfolios IV, not summed
|
394,143 | ||
| 46.2 |
Victory RS Small Cap Growth Fund
Fund
S000053581 · Registered fund · Jun 30, 2026
Victory Portfolios, not summed
|
96,980 | ||
| 46.3 |
Victory Pioneer Select Mid Cap Growth VCT Portfolio
Fund
S000089715 · Registered fund · Jun 30, 2026
Victory Variable Insurance Funds II, not summed
|
16,120 | ||
| 46.4 |
Victory Extended Market Index Fund
Fund
S000012941 · Registered fund · Jul 31, 2026
Victory Portfolios III, not summed
|
9,831 | ||
| 47 |
MASSACHUSETTS FINANCIAL SERVICES CO /MA/
13F
CIK 912938 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
406,274 | ||
| 47.1 |
MFS New Discovery Fund
Fund
S000000765 · Registered fund · May 31, 2026
MFS SERIES TRUST I, not summed
|
249,676 | ||
| 47.2 |
MFS New Discovery Series
Fund
S000002680 · Registered fund · Jun 30, 2026
MFS VARIABLE INSURANCE TRUST, not summed
|
109,210 | ||
| 47.3 |
MFS Global Alternative Strategy Fund
Fund
S000019515 · Registered fund · Jul 31, 2026
MFS Series Trust XV, not summed
|
951 | ||
| 48 |
GOLDMAN SACHS GROUP INC
13F
CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
399,844 | ||
| 48.1 |
Multi-Manager U.S. Small Cap Equity Fund
Fund
S000051363 · Registered fund · Apr 30, 2026
Goldman Sachs Trust II, not summed
|
19,218 | ||
| 48.2 |
Goldman Sachs Absolute Return Tracker Fund
Fund
S000020314 · Registered fund · Aug 31, 2026
GOLDMAN SACHS TRUST, not summed
|
3,589 | ||
| 49 |
BNP PARIBAS ARBITRAGE, SA
13F
CIK 1166588 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
394,688 | ||
| 50 |
|
387,414 |
24 more nested rows are not shown here; Every filing lists them all.
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.
Showing 1–50 of 359 holders
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