InvestorLens

MIAX — MIAMI INTL HLDGS INC

Public company

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For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

Why are billionaires buying MIAX?

Built from public SEC filings and public economic data. Not a recommendation.

Confidence
95
Institutional Conviction
Net accumulation · 1 buying vs 0 selling last quarter
66
Macro Tailwind
Macro conditions are mixed for this sector
52
Why? — Evidence & Confidence ▾

Of 1 tracked investors who changed their MIAX position last quarter, 1 bought and 0 sold (100% buy-side). Macro conditions are mixed for this sector (Macro Tailwind 52/100 in a Overheat regime).

Supporting evidence
  • +1 tracked investor added or increased positions last quarter (George Soros)
  • +4 tracked investors reported holding MIAX at their latest filing
Contradicting evidence — always shown
  • −13F data is disclosed up to 45 days after quarter end — positions may have changed since
Know the limits
  • · 13F disclosure lag (up to 45 days)
  • · Tracked investors are a sample, not the whole market
  • · Sector regime fit is a historical average, not a guarantee

Every InvestorLens score shows its evidence — including what argues against it. Model conviction-v1 · generated 7/25/2026.

About MIAMI INTL HLDGS INC (MIAX)

MIAMI INTL HLDGS INC (MIAX) appears in the most recent 13F filings of 4 tracked institutional investors. The largest disclosed position is held by Ken Griffin (Citadel Advisors), valued at $66M. Across recent filings, tracked investors recorded 2 new positions, 0 increased, 0 reduced, and 0 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in MIAX

100
/100
Strong Institutional Accumulation
Added / Increased2
Reduced0
Exited0
BearishBullish
Crowded Trade Score™

How many top investors track MIAX

27
/100
Emerging Interest
4investors

A small number of top investors own this.

UndiscoveredCrowded
151015+

MIAX Ownership Composition

How MIAMI INTL HLDGS INC is held across tracked investor types, based on reported 13F positions.

Dominant Type
Other
95% of tracked value
Institutions
4
tracked investors
Total Reported
$101.4M
combined 13F value
Sectors2
  • Other94.9%
  • Hedge Funds5.1%
Other(3)
94.9%
Hedge Funds(1)
5.1%

Tracked investors reporting MIAX

  • Ken GriffinMar 31, 2026
    Citadel Advisors
    Shares
    1.7M
    Value
    $65.9M
    % Portfolio
    0.01%
  • Izzy EnglanderMar 31, 2026
    Millennium Management
    Shares
    518.7K
    Value
    $20.2M
    % Portfolio
    0.01%
  • Paul Tudor JonesMar 31, 2026
    Tudor Investment Corp
    Shares
    259.8K
    Value
    $10.1M
    % Portfolio
    0.02%
  • George SorosMar 31, 2026
    Soros Fund Management
    Shares
    132.6K
    Value
    $5.2M
    % Portfolio
    0.06%

Recent activity

Frequently asked questions

How many institutional investors hold MIAX?
4 tracked institutional investors disclosed a position in MIAX (MIAMI INTL HLDGS INC) in their most recent 13F filing.
Who is the largest institutional holder of MIAX?
Ken Griffin, Citadel Advisors, holds the largest disclosed position in MIAX, valued at $66M.
Did institutional ownership of MIAX increase or decrease?
Across recent 13F filings, tracked investors recorded 2 new positions, 0 increased, 0 reduced, and 0 fully exited MIAX.
Where does this MIAX ownership data come from?
SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.
MIAX (MIAMI INTL HLDGS INC) — Institutional Holders & 13F — InvestorLens