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.
Trade date
Aug 18, 2026
Filing date
Aug 20, 2026
View on SEC Insider profile
Estimated value-$6.37MShares × reported price
Shares traded150k$42.41 per share
Holdings after1.57MIndirect · By Gallagher Investments, LLC
% of reported position tradedUnavailableThis security and ownership context
How reported position traded is calculated

Calculated only for code-P purchases and code-S sales.

Row-level estimate for this security and ownership context, not the insider’s complete portfolio. Joint ownership, other transactions in the filing, amendments and footnotes can affect interpretation.

MIAX price since this filing

Daily closing prices, with the filing date and available return windows
MIAX · Daily closing priceLoading daily prices…
Filing dateReturn windows appear as prices become available.
Pre-filing1mo ago +2.4%1w ago +2.4%1d ago +2.6%
Returns since7d +6.6%30d -6.1%90d180d1y

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
150,300 sh
$42.41 per share
Estimated value
-$6.37M
Computed from shares × price
Holdings after
1,572,975 sh
Indirect · By Gallagher Investments, LLC

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
10b5-1 Detected
Filing-only score

-28 points

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.

How this score is calculated
  • timely_filing+4 points

    reporting_delay_days = 2

    Filing reported within two business days of the transaction.
  • tax_withholding-22 points

    transaction_code = F

    Tax withholding on vesting shares is mechanical.
  • tenb5_1_detected-10 points

    is_10b5_1 = true

    Stored filing content includes detected 10b5-1 language.
Read the scoring methodology

Signed filing-only points, not a probability or expected return. Version v1.

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
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