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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
Marshall Wace
51
Marshall Wace
United Kingdom
$3.14M +$2.85M +77,960 New
CBA
52
Coastal Bridge Advisors
Connecticut
$3.08M +$2.8M +76,565 New
MRI
53
Mad River Investors
Massachusetts
$3M +$2.73M +74,600 New
TD Asset Management
54
TD Asset Management
Ontario, Canada
$2.55M +$2.32M +63,460 New
State Street
55
State Street
Massachusetts
$2.27M +$2.06M +56,445 New
ECM
56
ExodusPoint Capital Management
New York
$2.2M +$2M +54,604 New
DGM
57
Delta Global Management
New York
$2.03M +$1.85M +50,498 New
Two Sigma Investments
58
Two Sigma Investments
New York
$2.01M +$1.83M +50,011 New
Blackstone Inc
59
Blackstone Inc
New York
$2.01M +$1.83M +50,000 New
HP
60
Harvey Partners
New York
$2.01M +$1.83M +50,000 New
Tudor Investment Corp
61
Tudor Investment Corp
Connecticut
$1.83M +$1.67M +45,533 New
IP
62
Interval Partners
New York
$1.79M +$1.62M +44,357 New
Manulife (Manufacturers Life Insurance)
63
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$1.73M +$1.57M +42,994 New
Hudson Bay Capital Management
64
Hudson Bay Capital Management
Connecticut
$1.66M +$1.51M +41,145 New
Osaic Holdings
65
Osaic Holdings
Arizona
$1.32M +$1.2M +32,751 New
GPGA
66
Grandeur Peak Global Advisors
Utah
$1.27M +$1.15M +31,538 New
Northern Trust
67
Northern Trust
Illinois
$1.21M +$1.1M +30,068 New
Caisse de Depot et Placement du Quebec (CDPQ)
68
Caisse de Depot et Placement du Quebec (CDPQ)
Quebec, Canada
$1.21M +$1.1M +30,000 New
Qube Research & Technologies (QRT)
69
Qube Research & Technologies (QRT)
United Kingdom
$1.13M +$1.03M +28,122 New
DKCM
70
Davidson Kempner Capital Management
New York
$1.05M +$951K +26,000 New
PHS
71
Pekin Hardy Strauss
Illinois
$1.03M +$938K +25,650 New
D.E. Shaw & Co
72
D.E. Shaw & Co
New York
$1.01M +$917K +25,063 New
HP
73
Hound Partners
New York
$1.01M +$915K +25,000 New
WAM
74
Weiss Asset Management
Massachusetts
$1.01M +$915K +25,000 New
FAM
75
Fred Alger Management
New York
$986K +$896K +24,483 New
1 2
3
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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.