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MIAX

Miami International Holdings
MIAX

161 hedge funds and large institutions have $1.66B invested in Miami International Holdings in 2025 Q4 according to their latest regulatory filings, with 69 funds opening new positions, 62 increasing their positions, 20 reducing their positions, and 23 closing their positions.

New
Increased
Maintained
Reduced
Closed

210% more repeat investments, than reductions

Existing positions increased: 62 | Existing positions reduced: 20

200% more first-time investments, than exits

New positions opened: 69 | Existing positions closed: 23

83% more call options, than puts

Call options by funds: $6.44M | Put options by funds: $3.52M

61% more capital invested

Capital invested by funds: $1.03B → $1.66B (+$631M)

46.03% more ownership

Funds ownership: 0% → 46.03% (+46%)

40% more funds holding

Funds holding: 115 → 161 (+46)

33% more funds holding in top 10

Funds holding in top 10: 3 → 4 (+1)

Holders
161
Holders Change
+46
Holders Change %
+40%
% of All Funds
1.96%
Holding in Top 10
4
Holding in Top 10 Change
+1
Holding in Top 10 Change %
+33.33%
% of All Funds
0.05%
New
69
Increased
62
Reduced
20
Closed
23
Calls
$6.44M
Puts
$3.52M
Net Calls
+$2.92M
Net Calls Change
-$1.32M

Top Buyers

Rank Fund Capital Flow
1
American Century Companies
American Century Companies
Missouri
+$53.2M
2
BlackRock
BlackRock
New York
+$46.6M
3
Invesco
Invesco
Georgia
+$36.6M
4
T. Rowe Price Investment Management
T. Rowe Price Investment Management
Maryland
+$26.5M
5
Vanguard Group
Vanguard Group
Pennsylvania
+$24.3M

Top Sellers

Rank Fund Capital Flow
1
Citadel Advisors
Citadel Advisors
Florida
-$15.9M
2
Morgan Stanley
Morgan Stanley
New York
-$13.4M
3
T. Rowe Price Associates
T. Rowe Price Associates
Maryland
-$12M
4
Royal Bank of Canada
Royal Bank of Canada
Ontario, Canada
-$8.85M
5
GC
Gillson Capital
Illinois
-$8.33M
Name Holding Trade Value Shares
Change 		Change in
Stake
WA
151
WPG Advisers
Maryland
$5.24K +$5.26K +118 New
BIA
152
Bell Investment Advisors
California
$3.15K +$3.17K +71 New
BAM
153
Bellevue Asset Management
Washington
$1.77K – – –
GI
154
GAMMA Investing
California
$1.64K +$1.65K +37 New
BFS
155
Bare Financial Services
Pennsylvania
$1.2K +$1.2K +27 New
LFG
156
Larson Financial Group
Missouri
$1.11K +$1.11K +25 New
ZBNA
157
Zions Bancorporation, National Association
Utah
$1.11K +$1.11K +25 New
MAM
158
Marquette Asset Management
Minnesota
$799 +$803 +18 New
Simplex Trading
159
Simplex Trading
Illinois
$355 +$357 +8 New
CTC
160
Central Trust Company
Missouri
$311 +$312 +7 New
GC
161
Gillson Capital
Illinois
– -$8.33M -206,897 Closed
JG
162
Jain Global
New York
– -$6.19M -153,815 Closed
FGP
163
Freestone Grove Partners
California
– -$5.03M -125,000 Closed
Marshall Wace
164
Marshall Wace
United Kingdom
– -$3.14M -77,960 Closed
IP
165
Interval Partners
New York
– -$1.79M -44,357 Closed
Caisse de Depot et Placement du Quebec (CDPQ)
166
Caisse de Depot et Placement du Quebec (CDPQ)
Quebec, Canada
– -$1.21M -30,000 Closed
Qube Research & Technologies (QRT)
167
Qube Research & Technologies (QRT)
United Kingdom
– -$1.13M -28,122 Closed
DKCM
168
Davidson Kempner Capital Management
New York
– -$1.05M -26,000 Closed
D.E. Shaw & Co
169
D.E. Shaw & Co
New York
– -$1.01M -25,063 Closed
WAM
170
Weiss Asset Management
Massachusetts
– -$1.01M -25,000 Closed
ZP
171
Zimmer Partners
New York
– -$604K -15,000 Closed
RAM
172
Readystate Asset Management
Illinois
– -$503K -12,500 Closed
OAC
173
OMERS Administration Corp
Ontario, Canada
– -$459K -11,400 Closed
Man Group
174
Man Group
United Kingdom
– -$443K -11,008 Closed
Squarepoint
175
Squarepoint
New York
– -$415K -10,300 Closed
4 5 6
7
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MIAX Hedge Fund Activity: Q4 2025 in Review

161 of the 8,223 institutional investors tracked by Wall St. Rank reported a position in Miami International Holdings (MIAX) for Q4 2025, worth a combined $1.66B — up 61% from $1.03B a quarter earlier.

Buyers outnumbered sellers: 69 funds opened new MIAX positions and 23 closed out — a net gain of 46 holders — while 62 added to existing stakes and 20 trimmed.

The largest buyer was American Century Companies, adding an estimated $53.2M. The largest seller was Citadel Advisors, cutting an estimated $15.9M.

  • 161 institutional investors held Miami International Holdings (MIAX) as of Q4 2025, up from 115 in Q3 2025.
  • Funds reported $1.66B of Miami International Holdings stock for Q4 2025, up 61% quarter-over-quarter.
  • 69 funds opened new Miami International Holdings positions in Q4 2025 and 23 closed out, a net change of +46 holders.
  • The largest Miami International Holdings buyer in Q4 2025 was American Century Companies, an estimated $53.2M added.
  • The largest Miami International Holdings seller in Q4 2025 was Citadel Advisors, an estimated $15.9M sold.

Based on aggregated 13F filings for Q4 2025.