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SEC EDGARAUG 201 min read$MIAX

Gallagher Thomas P. sold $6.2M of MIAX (indirect holdings)

Gallagher Thomas P. (Chairman & CEO) sold 149,700 indirectly-held shares of MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) at $41.13 ($6.16M total) on 2026-08-19 under a Rule 10b5-1 trading plan.

Original reporting
SEC EDGAR · Gallagher Thomas P.
Published Aug 20, 2026, 8:12 PM UTC
Analysis
alphai AI DeskAI-generated
Added to alphai Aug 20, 2026, 8:17 PM UTC. Informational, not investment advice.
How this was made
alphai summarizes source reporting and applies a structured AI analysis for relevance, timing, sentiment and ticker impact. Always verify material claims with the original publisher.
About alphai AI DeskScoring methodologyReport an issue
alphai market briefInsider activity
Primary signal
$MIAX
Bearish
medium confidence
Mentioned
$MIAX
Relevance
5/10
alphai data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$MIAXBearishLow
01

Why it matters

The insider sale adds a modest bearish data point for MIAX, but the overall impact is limited.

02

Market read

A single insider sale of $6.1M may cause a slight short‑term price dip, but broader market impact is minimal.

03

What to watch

The remaining stake remains sizable, and the sale price was near recent market levels.

Relevance 5/10Novelty 6/10Timing: post-market 2026-08-20

Background

Form 4 filings disclose insider transactions and are primary sources for such events.

Company-level read

Ticker impact

$MIAXBearishMedium confidence
Context

CEO Gallagher Thomas P. sold 149,700 shares for $6.16M via a 10b5-1 plan, reducing his stake to 1.42M shares.

Expected impact

Potential short-term dip of 1‑2% as market digests the sale.

Evidence & confidence

Insider sales by a CEO are viewed as a bearish signal, but the sale size is modest relative to float.

Market effects

Sector

Minimal impact on the broader exchange‑trading sector.

Regional

Limited to U.S. markets where MIAX trades.

Global

Low global relevance.

Counterpoint

What could challenge this read

The sale could be a routine 10b5‑1 execution, not a negative outlook.

Key entities

  • Executive
    Gallagher Thomas P.

    Chairman & CEO of Miami International Holdings, Inc.

Read at source← All news

Full insider trading history

This story covers one filing. See everything behind it: every insider buy and sell on record, 10b5-1 plans, late filings, and which officers and directors are trading.

MIAX insider trading history →

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