Transaction · 0002080477-26-000016

Gallagher Thomas P.

Gallagher Thomas P., CHAIR, CEO, reported a transaction classified as withholding at MIAMI INTERNATIONAL HOLDINGS, INC. involving 150300.000000 shares for an estimated $6374223.00. Reported holdings after the transaction were 1572975.000000 shares. The stored filing text includes a detected 10b5-1 reference.

withholdingSEC transaction code FCHAIR, CEO
MIAXMIAMI INTERNATIONAL HOLDINGS, INC.
Filing timeAug 20
Trade dateAug 18, 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
$41.32
Pre-filing
1mo ago +2.4%1w ago +2.4%1d ago +2.6%
Returns since
7d +6.6%30d +1.9%90d +1.9%180d +1.9%1y +1.9%

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 2026-08-20Filed 15 days ago · 30 days of pre-filing context shaded
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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
withholding
Code F
Identifier
0002080477-26-000016
Common Stock
Transaction date
Aug 18, 2026
Filed Aug 20, 2026, 08:12 PM · 2d delay
Shares
150k sh
$4.24k per share
Estimated value
-$637M
Computed from shares × price
Holdings after
1.57M sh
Indirect · By Gallagher Investments, LLC

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $10.0MLarge $100M
10b5-1 Detected
-28score
Filing-only score

-28

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

Low filing signal

This filing has a meaningfully negative filing-only score. It is likely less useful as a positive insider-activity signal.

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

    Represents shares that have been surrendered to the Company to satisfy tax withholding and remittance obligations in connection with the net settlement of restricted stock awards and does not represen…

  2. F2

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

  3. F3

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

  4. F4

    This transaction was executed in multiple trades throughout the day at prices ranging from $38.85 to $42.56. The price reported above reflects the weighted average sales price. The Reporting Person he…

Original filing · 0002080477-26-000016
Related transactions

0 other filings

Same reporting owner
Recent company activity

0 recent txs

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