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.
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)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
HKAM
Horizon Kinetics Asset Management
New York
|
+$67.2M |
| 2 |
T. Rowe Price Investment Management
Baltimore,
Maryland
|
+$46.1M |
| 3 |
Citadel Advisors
Miami,
Florida
|
+$40.7M |
| 4 |
Morgan Stanley
New York
|
+$38.2M |
| 5 |
Two Sigma Investments
New York
|
+$31M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Jane Street
New York
|
-$26.3M |
| 2 |
JF
Jump Financial
Chicago,
Illinois
|
-$11M |
| 3 |
NRCM
North Reef Capital Management
Laguna Beach,
California
|
-$10.3M |
| 4 |
American Century Companies
Kansas City,
Missouri
|
-$9.34M |
| 5 |
LGM
Lykos Global Management
Stamford,
Connecticut
|
-$7.77M |
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.