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MIAX · Miami International Holdings, Inc. · Shareholders & Ownership

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$33.32 -0.66 (-1.94%)
Market Cap
$3.37B
Shares
99.23M
Volume · Oct 26 350.09K Avg daily vol (3M) 1.57M

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
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
Thomas P. Gallagher
13D CIK 2080477 · Unknown · Aug 26, 2025
Item 4 purpose: Passive investment
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
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
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
Nuveen, LLC
13F CIK 1871926 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
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
UBS Group AG
13F CIK 1610520 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
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
Alnakib Abdulwahab A
Insider CIK 2139054 · Jun 16, 2026
Director, issuer-wide, not summed
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
Schafer Douglas M. JR
Insider CIK 2079445 · Oct 2, 2026
EVP and CIO, issuer-wide, not summed
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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Key facts CIK 1438472 CUSIP 59356Q108 13F (30d) 22 filings 22 filers Visit website Investor relations