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SEC EDGARSEP 171 min read$MIAX

Brown Shelly sold $819K of MIAX

Brown Shelly (EVP, Chief Strategy Officer) sold 21,217 shares of MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) at $38.61 ($0.82M total) on 2026-09-16 under a Rule 10b5-1 trading plan.

Original reporting
SEC EDGAR · Brown Shelly
Published Sep 17, 2026, 8:43 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Sep 17, 2026, 9:17 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
Neutral
medium confidence
Mentioned
$MIAX
Relevance
4/10
AlphAI data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$MIAXNeutralLow
01

Why it matters

The disclosed sale is a routine 10b5‑1 execution by a senior executive, providing fresh but modest information for traders.

02

Market read

New insider sale adds a data point for MIAX investors; unlikely to drive major price movement.

03

What to watch

Potential upcoming strategic shifts at MIAX that prompted the insider to reduce exposure.

Relevance 4/10Novelty 4/10Timing: filing disclosed on 2026‑09‑16 (after‑hours)

Background

SEC Form 4 filing reports an insider transaction for Miami International Holdings, Inc. (MIAX).

Company-level read

Ticker impact

$MIAXNeutralMedium confidence
Context

EVP and Chief Strategy Officer sold 21,217 shares for $819,188 via a 10b5‑1 plan on 2026‑09‑16.

Expected impact

Potential short‑term dip of 0.5‑1% as market digests the sale.

Evidence & confidence

The sale is a routine 10b5‑1 transaction by a senior officer; impact is limited given the modest amount.

Market effects

Sector

Minimal effect on the exchange services sector; insider sales are common.

Regional

No regional impact beyond MIAX shareholders.

Global

Limited to investors tracking MIAX.

Counterpoint

What could challenge this read

The sale could be a pre‑emptive move before undisclosed negative news, warranting a cautious short position.

Key entities

  • Person
    Brown Shelly

    EVP, Chief Strategy Officer at MIAX who sold shares.

  • Company
    Miami International Holdings, Inc.

    Operator of the MIAX exchange platform.

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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