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MIAX

Miami International Holdings
MIAX

201 hedge funds and large institutions have $1.95B invested in Miami International Holdings in 2026 Q1 according to their latest regulatory filings, with 80 funds opening new positions, 83 increasing their positions, 26 reducing their positions, and 35 closing their positions.

New
Increased
Maintained
Reduced
Closed

219% more repeat investments, than reductions

Existing positions increased: 83 | Existing positions reduced: 26

129% more first-time investments, than exits

New positions opened: 80 | Existing positions closed: 35

25% more funds holding

Funds holding: 161 → 201 (+40)

22% more call options, than puts

Call options by funds: $13.4M | Put options by funds: $11M

18% more capital invested

Capital invested by funds: $1.66B → $1.95B (+$291M)

8.75% more ownership

Funds ownership: 46.03% → 54.79% (+8.8%)

0% more funds holding in top 10

Funds holding in top 10: 4 → 4 (0)

Holders
201
Holders Change
+40
Holders Change %
+24.84%
% of All Funds
2.47%
Holding in Top 10
4
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.05%
New
80
Increased
83
Reduced
26
Closed
35
Calls
$13.4M
Puts
$11M
Net Calls
+$2.38M
Net Calls Change
-$541K

Top Buyers

Rank Fund Capital Flow
1
HKAM
Horizon Kinetics Asset Management
New York
+$67.2M
2
T. Rowe Price Investment Management
T. Rowe Price Investment Management
Maryland
+$46.1M
3
Citadel Advisors
Citadel Advisors
Florida
+$40.7M
4
Morgan Stanley
Morgan Stanley
New York
+$38.2M
5
Two Sigma Investments
Two Sigma Investments
New York
+$31M

Top Sellers

Rank Fund Capital Flow
1
Jane Street
Jane Street
New York
-$26.3M
2
JF
Jump Financial
Illinois
-$11M
3
NRCM
North Reef Capital Management
California
-$10.3M
4
American Century Companies
American Century Companies
Missouri
-$9.34M
5
LGM
Lykos Global Management
Connecticut
-$7.77M
Name Holding Trade Value Shares
Change 		Change in
Stake
ASRS
226
Arizona State Retirement System
Arizona
– -$201K -4,536 Closed
AB
227
Amalgamated Bank
New York
– -$33K -740 Closed
GPFA
228
Game Plan Financial Advisors
Ohio
– -$11.1K -250 Closed
DT
229
DV Trading
Illinois
– -$8.88K -200 Closed
SAM
230
Smartleaf Asset Management
Massachusetts
– -$5.34K -117 Closed
BIA
231
Bell Investment Advisors
California
– -$3.15K -71 Closed
BAM
232
Bellevue Asset Management
Washington
– -$1.77K -40 Closed
BFS
233
Bare Financial Services
Pennsylvania
– -$1.2K -27 Closed
LFG
234
Larson Financial Group
Missouri
– -$1.11K -25 Closed
MAM
235
Marquette Asset Management
Minnesota
– -$799 -18 Closed
6 7 8 9
10

MIAX Hedge Fund Activity: Q1 2026 in Review

201 of the 8,126 institutional investors tracked by Wall St. Rank reported a position in Miami International Holdings (MIAX) for Q1 2026, worth a combined $1.95B — up 18% from $1.66B a quarter earlier.

Buyers outnumbered sellers: 80 funds opened new MIAX positions and 35 closed out — a net gain of 45 holders — while 83 added to existing stakes and 26 trimmed.

The largest buyer was Horizon Kinetics Asset Management, adding an estimated $67.2M. The largest seller was Jane Street, exiting entirely with an estimated $26.3M sold.

  • 201 institutional investors held Miami International Holdings (MIAX) as of Q1 2026, up from 161 in Q4 2025.
  • Funds reported $1.95B of Miami International Holdings stock for Q1 2026, up 18% quarter-over-quarter.
  • 80 funds opened new Miami International Holdings positions in Q1 2026 and 35 closed out, a net change of +45 holders.
  • The largest Miami International Holdings buyer in Q1 2026 was Horizon Kinetics Asset Management, an estimated $67.2M added.
  • The largest Miami International Holdings seller in Q1 2026 was Jane Street, an estimated $26.3M sold.

Based on aggregated 13F filings for Q1 2026.