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Of the 10 tracked institutions holding MIAX, 3 have a 3-year clone track record — 3 of them beat the S&P. Average holder's clone alpha: +3.4pt. It's a gauge of who owns the name, not just how many.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
Among the 10 tracked institutional investors we monitor, MIAX (MIAMI INTL HLDGS INC) is held with a combined value of $419.87M across 10,922,399 shares. The largest holder is BlackRock, Inc. with a position worth $188.47M. 2 funds opened new positions in the most recent quarter. 5 funds increased their holdings. 3 funds reduced their position.
Total Institutional Value
$419.87M
Total Shares Held
10,922,399
Institutional Holders
10
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | BlackRock, Inc. | $188.47M | 0.00% | +127.2% |
| 2 | VANGUARD GROUP INC | $85.58M | 0.00% | +39.5% |
| 3 | STATE STREET CORP | $53.25M | 0.00% | +101.2% |
| 4 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $42.51M | 0.06% | -8.3% |
| 5 | PRICE T ROWE ASSOCIATES INC /MD/ | $31.38M | 0.00% | +430.5% |
| 6 | WELLINGTON MANAGEMENT GROUP LLP | $9.74M | 0.00% | -41.1% |
| 7 | MILLENNIUM MANAGEMENT LLC | $7.03M | 0.00% | -63.5% |
| 8 | FMR LLC | $1.01M | 0.00% | +4083.7% |
| 9 | TWO SIGMA ADVISERS, LP | $461.64K | 0.00% | New |
| 10 | Magnetar Financial LLC | $452.16K | 0.00% | New |
| Member | Type | Date |
|---|---|---|
| Gilbert Cisneros | Buy | Mar 20, 2026 |
As of the latest SEC 13F filings, BlackRock, Inc. is the largest institutional holder of MIAX with a position worth $188.47M, representing 0.00% of their portfolio. In total, 10 institutional investors hold MIAX with a combined value of $419.87M.
In the most recent quarter, 2 funds opened a new position in MIAX. Additionally, 5 increased their holdings and 3 reduced their positions.
Institutional investors hold $419.87M worth of MIAX stock across 10 positions. The largest institutional holder is BlackRock, Inc. with $188.47M in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For MIAX, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their MIAX positions.
| 2026-07-29 |
SEC Schedule 13D (activist) and 13G (passive) filings for MIAX. Filed when an investor acquires 5%+ ownership.
Last Close
$30.95
2026-10-16
YTD
-29.1%
5% of 52-week range