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SEC EDGARJUN 41 min read$MIAX

Gallagher Thomas P. sold $3.0M of MIAX (indirect holdings)

Gallagher Thomas P. (Chairman & CEO) sold 70,000 indirectly-held shares of MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) at $42.36 ($2.97M total) on 2026-06-02 under a Rule 10b5-1 trading plan.

Original reporting
SEC EDGAR · Gallagher Thomas P.
Published Jun 4, 2026, 8:37 PM UTC
Analysis
alphai AI DeskAI-generated
Added to alphai Jun 4, 2026, 8:57 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
Neutral
high confidence
Mentioned
$MIAX
Relevance
6/10
alphai data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$MIAXNeutralLow
01

Why it matters

The disclosure confirms an officer/director sale of 70,000 shares at $42.36/share on 2026-06-02, with holdings after the trade reported as 1,723,275 shares.

02

Market read

Traders may monitor for follow-on insider activity, but the 10b5-1 designation generally dampens immediate fundamental implications.

03

What to watch

The filing does not disclose why the sale occurred or whether other insiders/funds changed positions around the same time.

Relevance 6/10Novelty 6/10Timing: Filed 2026-06-04; sale executed 2026-06-02

Background

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

Company-level read

Ticker impact

$MIAXNeutralHigh confidence
Context

MIAX CEO/Chairman Gallagher sold 70,000 shares in an open-market transaction under a pre-arranged 10b5-1 plan, disclosed via Form 4.

Expected impact

Likely minimal near-term impact; any reaction is more sentiment/positioning than fundamentals.

Evidence & confidence

This is a routine Form 4 insider transaction with stated 10b5-1 pre-arrangement, and no new operating/financial catalyst is provided.

Market effects

Sector

No sector read-through; this is company-specific insider activity without new business information.

Regional

None indicated.

Global

None indicated.

Counterpoint

What could challenge this read

Because the sale is under a 10b5-1 plan, it may reflect scheduled liquidity rather than bearish expectations; any dip could be overdone.

Key entities

  • issuer
    MIAMI INTERNATIONAL HOLDINGS, INC.

    Subject of the Form 4 insider sale by Chairman & CEO Thomas P. Gallagher.

  • insider
    Gallagher Thomas P.

    Chairman & CEO who executed the open-market sale under a pre-arranged 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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