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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
AWP
76
Atlas Wealth Partners
Pennsylvania
$881K +$801K +21,889 New
First Trust Advisors
77
First Trust Advisors
Illinois
$843K +$766K +20,938 New
JF
78
Jump Financial
Illinois
$764K +$694K +18,966 New
Walleye Capital
79
Walleye Capital
New York
$690K +$627K +17,131 New
Barclays
80
Barclays
United Kingdom
$640K +$582K +15,902 New
SHC
81
SALT Holding Corp
Delaware
$611K +$555K +15,173 New
ZP
82
Zimmer Partners
New York
$604K +$549K +15,000 New
MC
83
Moors & Cabot
Massachusetts
$598K +$543K +14,850 New
Raymond James Financial
84
Raymond James Financial
Florida
$519K +$472K +12,896 New
RAM
85
Readystate Asset Management
Illinois
$503K +$457K +12,500 New
OAC
86
OMERS Administration Corp
Ontario, Canada
$459K +$417K +11,400 New
Man Group
87
Man Group
United Kingdom
$443K +$403K +11,008 New
Squarepoint
88
Squarepoint
New York
$415K +$377K +10,300 New
CG
89
Caprock Group
Idaho
$376K +$366K +10,000 New
EGM
90
Engineers Gate Manager
New York
$361K +$328K +8,977 New
QC
91
Quantessence Capital
New York
$342K +$311K +8,507 New
CC
92
Centiva Capital
New York
$337K +$306K +8,378 New
SAM
93
Sompo Asset Management
Japan
$330K +$300K +8,200 New
UBS Group
94
UBS Group
Switzerland
$321K +$291K +7,967 New
Legal & General Group
95
Legal & General Group
United Kingdom
$302K +$274K +7,500 New
LIA
96
Limestone Investment Advisors
New York
$278K +$252K +6,900 New
Bank of New York Mellon
97
Bank of New York Mellon
New York
$267K +$243K +6,635 New
SIM
98
Sandia Investment Management
Massachusetts
$266K +$241K +6,600 New
HF
99
HRT Financial
New York
$239K +$217K +5,944 New
HighTower Advisors
100
HighTower Advisors
Illinois
$208K +$189K +5,175 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.