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SEC EDGARAUG 62 min read$MIAX

Gallagher Thomas P. sold $2.2M of MIAX (indirect holdings)

Gallagher Thomas P. (Chairman & CEO) sold 48,334 indirectly-held shares of MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) at $45.69 ($2.21M total) on 2026-08-04 under a Rule 10b5-1 trading plan.

Original reporting
SEC EDGAR · Gallagher Thomas P.
Published Aug 6, 2026, 4:00 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Aug 7, 2026, 7:46 AM 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
Neutral
medium confidence
Mentioned
$MIAX
Relevance
5/10
AlphAI data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$MIAXNeutralLow
01

Why it matters

The newest fact is the specific open-market sale size, price, and timing by the CEO, plus confirmation it was executed under a pre-arranged 10b5-1 plan.

02

Market read

Traders may monitor insider activity for sentiment, but this disclosure alone does not provide a new fundamental catalyst.

03

What to watch

The article does not state whether other insiders sold/bought around the same time, nor does it provide total insider ownership changes beyond the post-transaction share count.

Relevance 5/10Novelty 3/10Timing: filed Aug 6, transaction dated Aug 4

Background

The article is an SEC Form 4 insider transaction disclosure for Miami International Holdings, Inc. (MIAX).

Company-level read

Ticker impact

$MIAXNeutralMedium confidence
Context

MIAX filed an SEC Form 4 showing CEO Thomas P. Gallagher sold 48,334 shares at $45.6900 on an open-market S trade under a 10b5-1 plan.

Expected impact

Low likelihood of a sustained price move; any reaction is likely limited to short-term sentiment around insider selling.

Evidence & confidence

The filing is a routine Form 4 transaction with a pre-arranged 10b5-1 plan, and the article provides no new operational, financial, or regulatory catalyst for MIAX.

Market effects

Sector

Minimal. Insider sale disclosures typically do not reset sector expectations without accompanying company-specific fundamentals.

Regional

Minimal.

Global

Minimal.

Counterpoint

What could challenge this read

Because the sale is explicitly under a pre-arranged 10b5-1 plan, it may reflect scheduled liquidity rather than bearish information.

Key entities

  • issuer
    MIAX

    Miami International Holdings, Inc., the company whose insider transaction was disclosed.

  • insider
    Gallagher Thomas P.

    Chairman and CEO who sold shares via an open-market transaction under a 10b5-1 plan.

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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