MIAX in the 13F filings
Miami Intl HLDGS Inc · CUSIP 59356Q108
New listing in Q3 2025· first held by a tracked manager this quarter, so its new positions are allocations rather than a turn towards it
- Quarter end
- 30 Sep 2025
- the date the book describes
- Filed
- 14 Nov 2025
- latest of these filings; the earliest 14 Nov 2025
- Managers listing it
- 5
- at least, of 95 tracked, among listed positions
- Comparable managers
- 95
- filed both Q2 2025 and Q3 2025; 0 listed it in both
- Shares listed
- 734,085
- combined, among listed positions
- Reported value
- $30m
- combined, at the quarter end
Among the 95 comparable managers: 5 buyers (opened or added shares) and 0 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +734,085.
Managers listing MIAX in Q3 2025
5 of 5 holders
| Action | Filing | |||||
|---|---|---|---|---|---|---|
| Woodline Partners LP | 261,111 | $11m | under 0.1% | New | new | 14 Nov 2025 (the filing on sec.gov) |
| Schonfeld Strategic Advisors LLC | 217,714 | $8.8m | under 0.1% | New | new | 14 Nov 2025 (the filing on sec.gov) |
| Freestone Grove Partners LP | 125,000 | $5.0m | under 0.1% | New | new | 14 Nov 2025 (the filing on sec.gov) |
| Soros Fund Management LLC | 104,260 | $4.2m | 0.06% | New | new | 14 Nov 2025 (the filing on sec.gov) |
| Davidson Kempner Capital Management LP | 26,000 | $1.0m | under 0.1% | New | new | 14 Nov 2025 (the filing on sec.gov) |
Largest increases and reductions, by shares
Increases
- Woodline Partners LPnew position · 261,111 shares now+261,111
- Schonfeld Strategic Advisors LLCnew position · 217,714 shares now+217,714
- Freestone Grove Partners LPnew position · 125,000 shares now+125,000
- Soros Fund Management LLCnew position · 104,260 shares now+104,260
- Davidson Kempner Capital Management LPnew position · 26,000 shares now+26,000
Reductions
No reduction among listed positions.
New positions and exits
New (5)
Exited (0)
No exit shown by a manager’s own filing.
Ownership over time
Tracked managers listing it, at least.
| Quarter | Holders | Reported value | Buyers | Sellers |
|---|---|---|---|---|
| Q3 2025 | 5 | $30m | 5 | 0 |
| Q4 2025 | 3 | $20m | 15 | 12 |
| Q1 2026 | 3 | $15m | 21 | 7 |
| Q2 2026 | 3 | $97m | 12 | 15 |
Compare with…
Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.
MIAX and V →MIAX and AXP →MIAX and BAC →Choose a stock to compare with MIAX →
How much of the picture this is
A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.
Which funds own MIAX, latest filings →Back to the 13F Explorer →