Transaction · 0002080477-26-000018

Gallagher Thomas P.

Gallagher Thomas P., CHAIR, CEO, reported an open-market or private sale at MIAMI INTERNATIONAL HOLDINGS, INC. involving 47000.000000 shares for an estimated $1994210.00. Reported holdings after the transaction were 1423275.000000 shares. The stored filing text includes a detected 10b5-1 reference.

Open-market sellSEC transaction code SCHAIR, CEO
MIAXMIAMI INTERNATIONAL HOLDINGS, INC.
Filing timeSep 04
Trade dateSep 03, 2026
Filing · SECView on SEC
InsiderProfile

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$42.39
Pre-filing
1mo ago +7.0%1w ago +3.9%1d ago -4.2%
Returns since
7d +0.0%30d +0.0%90d +0.0%180d +0.0%1y +0.0%

MIAX price since this filing

30 days of pre-filing context and vertical markers at the filing date plus 7d / 30d / 90d / 180d / 1y afterwards
MIAX since 2026-09-04Filed yesterday · 1 day of post-filing data
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Filing datePost-filing windows (7d, 30d, 90d, 180d, 1y)30 days of pre-filing context

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
Sell
Code S
Identifier
0002080477-26-000018
Common Stock
Transaction date
Sep 03, 2026
Filed Sep 04, 2026, 08:35 PM · 1d delay
Shares
47.0k sh
$4.24k per share
Estimated value
-$199M
Computed from shares × price
Holdings after
1.42M sh
Indirect · By Gallagher Investments, LLC

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $10.0MLarge $100M
Cluster Selling Large Sale Repeat Seller 10b5-1 Detected
-6score
Filing-only score

-6

Compact filing score computed from stored Form 4 facts. Version v1.

Mixed or weak signal

This filing has a negative filing-only score. It may be less informative as an insider-activity signal and needs extra context.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

Chairman & CEO

Officer YesDirector Yes10% NoOther No
Footnotes & amended
  1. F1

    This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 29, 2025.

  2. F2

    Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC.

  3. F3

    This transaction was executed in multiple trades throughout the day at prices ranging from $42.00 to $42.68. The price reported above reflects the weighted average sales price. The Reporting Person he…

  4. F4

    The options are fully vested.

  5. F5

    4,464 of the shares subject to this incentive stock option are vested. 4,464 shares subject to this incentive stock option will vest on June 16, 2027 and the remaining 4,464 shares subject to this inc…

Original filing · 0002080477-26-000018
Related transactions

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Same reporting owner
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