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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
SGM
26
Seven Grand Managers
New York
$17.8M +$4.46M +100,000 +33%
Victory Capital Management
27
Victory Capital Management
Texas
$17.4M +$4.01M +89,875 +30%
SEI Investments
28
SEI Investments
Pennsylvania
$15.1M +$10.7M +239,064 +236%
IECM
29
Intrinsic Edge Capital Management
Illinois
$14.3M -$1.15M -25,873 -7%
Bank of America
30
Bank of America
North Carolina
$13.5M +$4.96M +111,220 +58%
BGM
31
Burkehill Global Management
New York
$12.9M +$6.24M +140,000 +93%
JF
32
Jump Financial
Illinois
$12.7M +$11.9M +266,300 +1,404%
Millennium Management
33
Millennium Management
New York
$12.6M +$5.63M +126,182 +80%
DGM
34
Delta Global Management
New York
$12.4M +$10.2M +228,531 +453%
Norges Bank
35
Norges Bank
Norway
$12.3M +$12.4M +277,200 New
Massachusetts Financial Services
36
Massachusetts Financial Services
Massachusetts
$12.2M -$1.06M -23,806 -8%
WP
37
Woodline Partners
California
$11.6M – – –
PCM
38
Penn Capital Management
Pennsylvania
$11.2M +$11.2M +252,125 New
AI
39
Axiom Investors
Connecticut
$10.8M +$10.8M +243,174 New
Healthcare of Ontario Pension Plan (HOOPP) Trust Fund
40
Healthcare of Ontario Pension Plan (HOOPP) Trust Fund
Ontario, Canada
$10.4M +$1.53M +34,244 +17%
Morgan Stanley
41
Morgan Stanley
New York
$9.8M -$13.4M -300,098 -58%
TAM
42
Tocqueville Asset Management
New York
$9.8M -$443K -9,925 -4%
Federated Hermes
43
Federated Hermes
Pennsylvania
$8.88M -$2.23M -50,000 -20%
Renaissance Technologies
44
Renaissance Technologies
New York
$8.66M +$8.7M +195,099 New
BNP Paribas Financial Markets
45
BNP Paribas Financial Markets
France
$8.48M +$8.52M +191,020 New
Charles Schwab
46
Charles Schwab
California
$8.3M +$4.4M +98,630 +112%
RA
47
Royce & Associates
New York
$8.05M +$8.09M +181,466 New
MIM
48
Monashee Investment Management
Massachusetts
$7.77M +$1.11M +25,000 +17%
LGM
49
Lykos Global Management
Connecticut
$7.77M +$7.8M +175,000 New
Northern Trust
50
Northern Trust
Illinois
$7.53M +$6.22M +139,546 +464%
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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.