Miami International Holdings (MIAX): which funds own it
A 13F shows the portfolio at quarter-end and is filed up to 45 days later: these are not real-time positions and they may have changed.
Sections with a free account
3 concentrated managers hold it with a median weight of 0.4%.
Who owns Miami International Holdings?
Holders reporting more than 5% of the shares to the SEC (Schedules 13D/13G): Horizon Kinetics Asset Management, 7.8% (13D/A filed May 21, 2026), BlackRock, 6.2% (13G/A filed Oct 27, 2026) and T. Rowe Price Investment Management, 5.3% (13G filed Aug 14, 2026). Stahl Murray is listed on Form 4 filings as an owner of more than 10%. As of Jun 30, 2026, the largest holders reported on Form 13F were Horizon Kinetics Asset Management (8.3% of the shares), BlackRock (5.3%) and T. Rowe Price Investment Management (5.3%).
Which institutions hold the most Miami International Holdings shares?
Per Form 13F filings as of Jun 30, 2026, as a share of all shares outstanding:
- 1. Horizon Kinetics Asset Management: 8.3%
- 2. BlackRock: 5.3%
- 3. T. Rowe Price Investment Management: 5.3%
- 4. Vanguard Portfolio Management: 4.0%
- 5. Susquehanna International Group, LLP: 3.5%
- 6. Vanguard Capital Management: 3.3%
- 7. Invesco: 2.1%
- 8. J Digital 6: 1.9%
- 9. Blair William: 1.9%
- 10. Balyasny Asset Management: 1.8%
How much of Miami International Holdings do institutions own?
The 206 institutions that file 13F reported 76.0% of the shares as of Jun 30, 2026.
Sources:13D/A by Horizon Kinetics Asset Management (May 21, 2026) ↗13G/A by BlackRock (Oct 27, 2026) ↗13G by T. Rowe Price Investment Management (Aug 14, 2026) ↗All of the company's proxy statements on EDGAR ↗
13F percentages divide the shares each institution reports by the shares outstanding on the cover of the company's latest report before the quarter end (Apr 30, 2026). Entities of the same group file separately and are not added up. We hold 13D and 13G filings made since Dec 23, 2024: a holder above 5% that has not filed since then does not appear here.
Miami International Holdings revenue
Miami International Holdings reported annual revenue of $1.36 billion for fiscal year 2025 (year ended December 31, 2025), according to its Form 10-K filed with the SEC (XBRL data).
Quarter flow (concentrated managers)
Change in managers (3 → 3): 0 opened · 0 exited = 0
Net flow in the quarter: −$20.5M (−552 K shares) · bought $7.8M and sold $28.4MShares concentrated managers added minus those they cut, valued at the 13F quarter-end implied price, not each trade's price. It is a different measure from the change in managers: the two can have opposite signs.
The set of concentrated managers changed between quarters: with the set as it was then, 4 held it last quarter (the chart point); with today's set, 3 (the base for the change).
Concentrated managers holding it
- MAD River InvestorsIncreased$10.7M4.0%+2.8 pp
- North Reef Capital ManagementReduced$9.3M0.4%−1.0 pp
- Grandeur Peak Global AdvisorsIncreased$707K0.2%+0.0 pp
Up to 15, sorted by position value. The percentage is the weight in each manager's portfolio.
Largest holders of MIAX (all 13F filers)
- Horizon Kinetics Asset Management7.8 MType not verified · 7.84% of the company+4.4 M
- BlackRock5.1 MIndex manager · 5.07% of the company+2.8 M
- T. Rowe Price Investment Management5.0 MInvestment firm · 5.03% of the company+887 K
- Vanguard Portfolio Management3.8 MIndex manager · 3.78% of the company+2.4 M
- Susquehanna International Group, LLP3.4 MBank or trading desk · 3.35% of the company+59 K
- Vanguard Capital Management3.2 MIndex manager · 3.16% of the company+1.8 M
- Invesco2.0 MInvestment firm · 2.02% of the company+436 K
- J Digital 61.8 MType not verified · 1.81% of the company+1.8 M
- Blair William1.8 MWealth adviser · 1.77% of the company+1.1 M
- Balyasny Asset Management1.7 MQuant or multi-manager · 1.68% of the company+1.7 M
- Shares
- 7.8 M
- Change
- +4.4 M
- % of the company
- 7.84%
See more
- Type
- Type not verified
- Value
- $291M
- Shares
- 5.1 M
- Change
- +2.8 M
- % of the company
- 5.07%
See more
- Type
- Index manager
- Value
- $188M
- Shares
- 5.0 M
- Change
- +887 K
- % of the company
- 5.03%
See more
- Type
- Investment firm
- Value
- $187M
- Shares
- 3.8 M
- Change
- +2.4 M
- % of the company
- 3.78%
See more
- Type
- Index manager
- Value
- $141M
- Shares
- 3.4 M
- Change
- +59 K
- % of the company
- 3.35%
See more
- Type
- Bank or trading desk
- Value
- $125M
- Shares
- 3.2 M
- Change
- +1.8 M
- % of the company
- 3.16%
See more
- Type
- Index manager
- Value
- $118M
- Shares
- 2.0 M
- Change
- +436 K
- % of the company
- 2.02%
See more
- Type
- Investment firm
- Value
- $75.1M
- J Digital 6
- Shares
- 1.8 M
- Change
- +1.8 M
- % of the company
- 1.81%
See more
- Type
- Type not verified
- Value
- $67.2M
- Shares
- 1.8 M
- Change
- +1.1 M
- % of the company
- 1.77%
See more
- Type
- Wealth adviser
- Value
- $65.8M
- Shares
- 1.7 M
- Change
- +1.7 M
- % of the company
- 1.68%
See more
- Type
- Quant or multi-manager
- Value
- $62.5M
The 10 13F filers with the most shares as of Jun 30, 2026, whatever their type (index firms usually come first). “Change”: shares added or cut versus the previous quarter, split-adjusted; “no data” = there is no comparable portfolio for the previous quarter (no filing, or a filing with its holdings under confidential treatment). “% of the company” only where shares outstanding are up to date. Entities of the same group file separately and some 13F filings include other managers: there may be double counting. With a free account: the top 25, the largest buyers and the largest sellers.
Held by institutions (13F)
Institutions (13F): 76.0% of the shares · top 10: 37.4% · in index firms: 22.6% of the institutional total
Q2 2026: 76.0%
Shares reported by the 206 13F filers as of Jun 30, 2026, divided by the shares outstanding on the cover of the company's latest report (Apr 30, 2026). It is not all institutional ownership: only managers above $100M file a 13F, and it excludes short positions. Entities of the same group file separately and some 13F filings include other managers: there may be double counting. We only publish it where the figure is credible: not for ADRs, companies with more than one share class or stale shares-outstanding data.
Fundamentals
12-month figures to Sep 30, 2026.
- Operating margin
- 10.9%
- Net margin
- 19.8%
- ROE
- 24.3%
- Revenue (TTM)
- $1.5 bn
- Revenue growth
- 14.0%
- Net income (TTM)
- $297M
- Quality vs sector
- —
Bank, insurer or other financial company: we do not show net debt / EBITDA or free cash flow. Its cash flow moves with loans and the investment portfolio, and its debt is part of the business: those figures do not read as they do for an industrial company.
Net margin is above operating margin: net income includes gains that do not come from operations (for example, revaluation of investments). To judge the business, look at operating margin and free cash flow.
This company's sector comes from its SIC code, unreviewed, or has too few comparable companies: we do not compare it with its sector.
Figures from the statements the company filed with the SEC (10-K, 10-Q). Free cash flow = operating cash flow − capital expenditures; empty if the company does not report capex. “Quality vs sector”: 0 to 100, the average of its percentiles in ROE, operating margin, free-cash-flow margin, revenue and earnings growth and net debt / EBITDA (at least 3 needed) against companies in its sector above $300M. How each figure is calculated
Earnings quality and debt
44.9% of net income does not come from operations.
- Operating cash flow ÷ net income (12 months)
- 0.85
Bank or insurer: debt ratios do not apply.
From the figures the company filed with the SEC. Cash flow over net income near or above 1 means earnings are collected in cash; far below, that part is accounting. Coverage says how many times operating income pays the latest fiscal year's interest. Maturities come from the debt note of the latest annual report, counted from its closing date. “No data” never means zero.
Insiders (Form 4)
10% owners who bought (6 m): 0
Open-market purchases, excluding 10b5-1 plans. Officers and directors only; joint filers of the same purchase count as one. 10% owners with no role are shown separately. 0 = nobody bought; “no data” = we do not have its Form 4 filings.
Each of the company's Form 4 filings, on EDGAR ↗Latest trades, with date and filing →
Above 5% (13D/13G)
Disclosed stakes, with their amendments. A filing is not always a purchase: there are also reductions and changes of filing entity.
This list may be incomplete: we hold 13D and 13G filings made since Dec 23, 2024. A holder above 5% that has not filed anything since then is not shown here.
Above 5% over time (13D/13G)
Each holder with its filings in order. History since December 2024.
Flagged material events (8-K)
Unregistered sale of equity securities (Item 3.02)
Change in directors or officers (Item 5.02)
Change in directors or officers (Item 5.02)
Change in directors or officers (Item 5.02)
Change in directors or officers (Item 5.02)
Unregistered sale of equity securities (Item 3.02)
Unregistered sale of equity securities (Item 3.02)
Unregistered sale of equity securities (Item 3.02)
Alert items the company itself flagged in its 8-K filings with the SEC, most serious first. It is the form's label, with no interpretation from us: Item 5.02 covers routine appointments as well as a chief executive's departure; open the filing. The quoted headline is the original press release's.
All material events (8-K)
Earnings, agreements, financing, management changes and announcements from the last year, with a filter by type and a link to each filing.
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