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MIAX

Miami International Holdings
MIAX

115 hedge funds and large institutions have $1.03B invested in Miami International Holdings in 2025 Q3 according to their latest regulatory filings, with 115 funds opening new positions, increasing their positions, reducing their positions, and closing their positions.

New
Increased
Maintained
Reduced
Closed

58% more call options, than puts

Call options by funds: $11.5M | Put options by funds: $7.25M

Holders
115
Holders Change
+115
Holders Change %
–
% of All Funds
1.51%
Holding in Top 10
3
Holding in Top 10 Change
+3
Holding in Top 10 Change %
% of All Funds
0.04%
New
115
Increased
–
Reduced
–
Closed
–
Calls
$11.5M
Puts
$7.25M
Net Calls
+$4.24M
Net Calls Change
+$4.24M

Top Buyers

Rank Fund Capital Flow
1
Susquehanna International Group
Susquehanna International Group
Pennsylvania
+$120M
2
T. Rowe Price Investment Management
T. Rowe Price Investment Management
Maryland
+$88.9M
3
Vanguard Group
Vanguard Group
Pennsylvania
+$50.6M
4
HKAM
Horizon Kinetics Asset Management
New York
+$50.6M
5
Alyeska Investment Group
Alyeska Investment Group
Illinois
+$46.3M

Top Sellers

No sellers this quarter
Name Holding Trade Value Shares
Change 		Change in
Stake
TYCC
101
Texas Yale Capital Corp
Florida
$201K +$183K +5,000 New
Wells Fargo
102
Wells Fargo
California
$141K +$129K +3,514 New
TRCT
103
Tower Research Capital (TRC)
New York
$111K +$101K +2,751 New
EMFAT
104
Emerald Mutual Fund Advisers Trust
Pennsylvania
$101K +$91.5K +2,500 New
MCM
105
Manchester Capital Management
Vermont
$29.5K +$26.8K +732 New
National Bank of Canada
106
National Bank of Canada
Quebec, Canada
$28.7K +$25.6K +700 New
Citigroup
107
Citigroup
New York
$20.3K +$18.4K +504 New
GPFA
108
Game Plan Financial Advisors
Ohio
$20.1K +$18.3K +500 New
Comerica Bank
109
Comerica Bank
Texas
$12.8K +$11.6K +317 New
UIC
110
Uniplan Investment Counsel
Wisconsin
$4.79K +$4.35K +119 New
WTA
111
Washington Trust Advisors
Massachusetts
$4.27K +$3.88K +106 New
GRP
112
Global Retirement Partners
California
$3.26K +$2.96K +81 New
Fidelity Investments
113
Fidelity Investments
Massachusetts
$3.02K +$2.74K +75 New
BAM
114
Bellevue Asset Management
Washington
$1.61K +$1.46K +40 New
AW
115
Avion Wealth
Texas
– +$549 +15 New
1 2 3 4
5

MIAX Hedge Fund Activity: Q3 2025 in Review

115 of the 7,621 institutional investors tracked by Wall St. Rank reported a position in Miami International Holdings (MIAX) for Q3 2025, worth a combined $1.03B.

Buyers outnumbered sellers: 115 funds opened new MIAX positions and 0 closed out — a net gain of 115 holders — while 0 added to existing stakes and 0 trimmed.

The largest buyer was Susquehanna International Group, opening a new position worth an estimated $120M.

  • 115 institutional investors held Miami International Holdings (MIAX) as of Q3 2025, up from 0 in Q2 2025.
  • Funds reported $1.03B of Miami International Holdings stock for Q3 2025.
  • 115 funds opened new Miami International Holdings positions in Q3 2025 and 0 closed out, a net change of +115 holders.
  • The largest Miami International Holdings buyer in Q3 2025 was Susquehanna International Group, an estimated $120M added.

Based on aggregated 13F filings for Q3 2025.