Transaction · 0001628280-26-065268

Schafer Douglas M. JR

Schafer Douglas M. JR, EC, reported an open-market or private sale at MIAMI INTERNATIONAL HOLDINGS, INC. involving 40000.000000 shares for an estimated $1333600.00. Reported holdings after the transaction were 387414.000000 shares. The stored filing text includes a detected 10b5-1 reference.

Open-market sellSEC transaction code SEC
MIAXMIAMI INTERNATIONAL HOLDINGS, INC.
Filing timeOct 06
Trade dateOct 02, 2026
Filing · SECView on SEC
InsiderProfile
% of reported position traded9.36%Shares sold ÷ (holdings after + shares sold). Estimated position before: 427,414 shares.

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.

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$30.79
Pre-filing
1mo ago +31.9%1w ago +13.3%1d ago +9.6%
Returns since
7d30d90d180d1y

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 2026-10-06Filed 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
0001628280-26-065268
Common Stock
Transaction date
Oct 02, 2026
Filed Oct 06, 2026, 09:28 PM · 4d delay
Shares
40.0k sh
$33.34 per share
Estimated value
-$1.33M
Computed from shares × price
Holdings after
387k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Direct Ownership Large Sale 10b5-1 Detected
-4score
Filing-only score

-4

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

Neutral filing signal

This filing is broadly neutral on the filing-only scale. The Form 4 facts do not strongly tilt positive or negative.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

EVP and CIO

Officer YesDirector No10% 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 16, 2025.

  2. F2

    This transaction was executed in multiple trades throughout the day at prices ranging from $32.91 to $33.97. The price reported above reflects the weighted average sales price. The Reporting Person he…

  3. F3

    The options are fully vested.

Original filing · 0001628280-26-065268
Related transactions

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Same reporting owner
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