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Miami International Holdings MIAX

US equityMarket cap rank #2392
$34.32 +$1.31 (+3.97%)
Market closed · Oct 5, 10:20 pm ET · Last extended-hours $35.55 +3.58%
Open$33.51
Prev close$33.01
Day range$32.74 – $34.79
Volume1.68M
Market cap$3.41B
P/E (TTM)23.8
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership82.5%-0.35 pts vs. prior quarter
Institutions holding259+1 vs. prior quarter
Insider trades (recent)17 buys / 33 sellsNet selling
Short interest6.90% of floatDays to cover 5.0 · as of 15 Sep 2026
Short-sale volume share18.8%5-day average of daily volume

Short-sale volume as % of daily volume

13%21%30%38%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$7.49M (6 inflow days, 14 outflow days).

The five largest holders on file together own 26.6% of shares outstanding.

Largest holders

  • Horizon Kinetics Holding Corporation7.90%
  • T. Rowe Price Group, Inc.5.92%
  • BlackRock5.11%
  • Wolverine Asset Management, LLC3.84%
  • Vanguard Portfolio Management, LLC3.82%
  • Arzan Financial Group for Financing and Investment - KPSC3.65%
  • Vanguard Capital Management, LLC3.51%
  • Susquehanna International Group, LLP3.38%

By investor type

  • Mutual Fund54.31%
  • Hedge Fund13.34%
  • Public Company7.02%
  • Private Company5.52%
  • Individual/Insider4.90%
  • Government Pension Fund1.22%
  • Family Office/Trust0.52%
  • Sovereign Wealth Fund0.25%

Reported short interest has fallen from 7.99% to 6.90% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 6,842,367 6.9% 5.0
31 Aug 2026 6,787,161 6.8% 5.6
14 Aug 2026 7,390,843 7.4% 5.4
31 Jul 2026 6,225,929 6.6% 5.4
15 Jul 2026 7,572,771 8.0% 4.5
30 Jun 2026 7,587,144 8.0% 2.0

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