Who owns MIAX? 13F holders and whale ownership
MIAX is tracked across public portfolios in Whale Analyzer. This page answers who owns MIAX, which top funds are buying MIAX, aggregate disclosed value, and recent position changes based on public data. Horizon Kinetics is the largest reported holder at $134M; the top five funds control 100.0% of reported ownership; institutions were net buying last quarter (1 increased, 0 reduced); the stock trades above the aggregate whale cost basis of $34.89. Top tracked holders include Horizon Kinetics.
Continue to the live MIAX dashboardTop holders
| Investor | Reported value | Shares | Change |
|---|---|---|---|
| Horizon Kinetics 13F portfolio Horizon Kinetics Asset Management holdings | $134.3M | 3.5M | Increased |
Ownership concentration
Reported ownership of MIAX is highly concentrated across tracked institutions.
- Single largest holder: 100.0% of reported ownership
- Top 5 holders: 100.0%
- Top 10 holders: 100.0%
Whale activity this quarter
Across 1 tracked institutions, 1 increased. Net positioning is net buying.
- Horizon Kinetics — Horizon Kinetics Asset Management ($134.3M) (▲ 89.7% qoq shares) · avg cost $34.89
Whale cost basis vs current price
The aggregate tracked cost basis is $34.89 versus a current price of $37.92, so MIAX trades above its cost basis (+8.7%). Average unrealized P&L across tracked holders: 49%.
Sector positioning — Other
MIAX sits within the Other sector alongside 670 other tracked names. Compare whale ownership across peers:
How to use this page
Values are reported public positions from tracked 13F filers and disclosures — not real-time ownership totals. Open the live MIAX dashboard for price charts and cross-investor scans, or read the SEC 13F guide.
Related stock holder pages
- TPL whale holders — TEXAS PACIFIC LAND CORPORATI
- GBTC whale holders — GRAYSCALE BITCOIN TRUST ETF
- LB whale holders — LANDBRIDGE COMPANY LLC
- HE whale holders — HAWAIIAN ELEC INDS INC MTN B
- WPM whale holders — WHEATON PRECIOUS METALS CORP
- WBI whale holders — WATERBRIDGE INFRASTRUCTURE L
- FNV whale holders — FRANCO NEV CORP
- PBT whale holders — PERMIAN BASIN RTY TR
Learn more in Whale Analyzer Academy
Deepen your read on MIAX with these Whale Analyzer Academy guides:
Frequently asked questions
Who owns MIAX stock?
Whale Analyzer tracks 1 public institutional holders of MIAX with a combined reported value of $134.3M. See the holder table above for the largest tracked positions.
Which top funds are buying MIAX?
Tracked institutions were net buying last quarter — 1 increased. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is MIAX ownership?
The top five tracked holders report 100.0% of aggregate ownership.
Is MIAX above or below the whale cost basis?
The aggregate tracked cost basis is $34.89 versus a current price of $37.92 (+8.7%).
What does 13F ownership mean for MIAX?
Use the interactive MIAX dashboard on Whale Analyzer for real-time holder analysis, or read our 13F Alpha Signals Guide.