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ISSUER PROFILE · CIK 0001438472 · CUSIP 59356Q108

MIAMI INTERNATIONAL HOLDINGS, INC.MIAX

1 13D/G filings 1 distinct filers 9 insider transactions (365d)

Post-Filing Returns · across 1 activist filings on this issuer

Median 30d
0.0%
avg 0.0%
Median 60d
-3.8%
avg -3.8%
Median 90d
—
avg —
Median 180d
—
avg —

Returns measured from each activist filing's date_of_event, split + dividend adjusted via Yahoo Finance.

Cross-Reference Snapshot

Activist filings
1
1 SCHEDULE 13D/A
Distinct filers
1
single filer
Insiders (365d)
9
0 buys · 5 sales
Latest short DTC
4.64
as of 2026-09-30

Institutional Consensus · 2025-12-31

Held by elite portfolio managers
1 holder · $6.86M
Soros Fund Management

13D/G Filings Timeline · 1 total

FiledFormFilerStakeSharesIntent
2026-05-21 SCHEDULE 13D/A HORIZON KINETICS ASSET MANAGEMENT LLC 7.80% 7,400,316 view →

Form 4 Insider Transactions · last 365d

DateInsiderRoleTypeSharesPriceValue
2026-05-04 Brown Shelly officer Option exercise 16,000 $12.00 $192K
2026-05-04 Teekell Judson Gray director Sale 3,000 $47.30 $142K
2026-05-04 Schafer Douglas M. JR officer Option exercise 48,000 $12.00 $576K
2026-05-04 Eckert Kurt M. director Option exercise 5,625 $12.00 $68K
2026-05-04 Comly Barbara J. officer Option exercise 28,000 $12.00 $336K
2026-05-04 Schafer Douglas M. JR officer Sale 48,000 $47.25 $2.27M
2026-05-04 Brown Shelly officer Sale 16,000 $47.28 $756K
2026-05-04 Eckert Kurt M. director Sale 5,625 $47.29 $266K
2026-05-04 Comly Barbara J. officer Sale 28,000 $47.26 $1.32M

FINRA Short Interest History

SettlementShort InterestDays to Cover% Δ vs prior
2026-09-30 8,880,720 4.64 +29.8%
2026-09-15 6,842,367 4.98 +0.8%
2026-08-31 6,787,161 5.64 -8.2%
2026-08-14 7,390,843 5.41 +18.7%
2026-07-31 6,225,929 5.38 -17.8%
2026-07-15 7,572,771 4.46 -0.2%
2026-06-30 7,587,144 1.98 +57.1%
2026-06-15 4,829,534 2.20 +6.8%
2026-05-29 4,524,354 3.83 +28.1%
2026-05-15 3,530,406 2.40 +49.9%
2026-04-30 2,354,553 2.81 +4.8%
2026-04-15 2,246,370 1.62 -33.8%

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