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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
WP
26
Woodline Partners
California
$10.5M +$9.55M +261,111 New
American Century Companies
27
American Century Companies
Missouri
$10.3M +$9.34M +255,282 New
Federated Hermes
28
Federated Hermes
Pennsylvania
$10.1M +$9.15M +250,000 New
TAM
29
Tocqueville Asset Management
New York
$9.29M +$8.44M +230,700 New
SSA
30
Schonfeld Strategic Advisors
New York
$8.77M +$7.96M +217,714 New
GC
31
Gillson Capital
Illinois
$8.33M +$7.57M +206,897 New
Ameriprise
32
Ameriprise
Minnesota
$8.3M +$7.55M +206,281 New
Healthcare of Ontario Pension Plan (HOOPP) Trust Fund
33
Healthcare of Ontario Pension Plan (HOOPP) Trust Fund
Ontario, Canada
$8.05M +$7.32M +200,000 New
Royal Bank of Canada
34
Royal Bank of Canada
Ontario, Canada
$8.05M +$7.32M +200,000 New
Goldman Sachs
35
Goldman Sachs
New York
$7.78M +$7.07M +193,191 New
Bank of America
36
Bank of America
North Carolina
$7.76M +$7.05M +192,641 New
DCM
37
Driehaus Capital Management
Illinois
$7.71M +$7.01M +191,613 New
QOP
38
Quinn Opportunity Partners
Virginia
$6.55M +$5.95M +162,656 New
MCM
39
Maltese Capital Management
New York
$6.44M +$5.85M +160,000 New
Geode Capital Management
40
Geode Capital Management
Massachusetts
$6.42M +$5.83M +159,394 New
Millennium Management
41
Millennium Management
New York
$6.38M +$5.8M +158,482 New
JG
42
Jain Global
New York
$6.19M +$5.63M +153,815 New
BGM
43
Burkehill Global Management
New York
$6.04M +$5.49M +150,000 New
MIM
44
Monashee Investment Management
Massachusetts
$6.04M +$5.49M +150,000 New
FGP
45
Freestone Grove Partners
California
$5.03M +$4.57M +125,000 New
LP
46
LMR Partners
United Kingdom
$4.42M +$4.02M +109,795 New
SFM
47
Soros Fund Management
New York
$4.2M +$3.81M +104,260 New
SEI Investments
48
SEI Investments
Pennsylvania
$4.07M +$3.7M +101,191 New
UE
49
Unisphere Establishment
Liechtenstein
$4.03M +$3.66M +100,000 New
Charles Schwab
50
Charles Schwab
California
$3.56M +$3.23M +88,434 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.