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SEC EDGARJUL 172 min read$MGNI

BARRETT MICHAEL G. sold $785K of MGNI

BARRETT MICHAEL G. (CEO) sold 38,596 shares of MAGNITE, INC. (MGNI) at $20.35 ($0.79M total) on 2026-07-15 under a Rule 10b5-1 trading plan.

Original reporting
SEC EDGAR · BARRETT MICHAEL G.
Published Jul 17, 2026, 9:00 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Jul 17, 2026, 9:03 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
$MGNI
Neutral
high confidence
Mentioned
$MGNI
Relevance
4/10
AlphAI data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$MGNINeutralLow
01

Why it matters

The newest fact is the CEO’s planned open-market sale size, price, and post-transaction holdings; it does not include any new company fundamentals.

02

Market read

Primarily a sentiment/positioning datapoint for MGNI, with limited expected impact absent other catalysts.

03

What to watch

Traders may over-weight insider sales; without additional context (e.g., concurrent buys, changes in guidance, or unusual volume), the signal is usually weak.

Relevance 4/10Novelty 3/10Timing: after-hours SEC Form 4 filed 2026-07-17

Background

The article is an SEC Form 4 insider transaction disclosure for Magnite, Inc. (MGNI).

Company-level read

Ticker impact

$MGNINeutralHigh confidence
Context

Magnite CEO Barrett Michael G. sold 38,596 shares at $20.35 on 2026-07-15 under a pre-arranged 10b5-1 plan.

Expected impact

Likely limited near-term impact; any effect would be sentiment-only and typically fades unless paired with other negative news.

Evidence & confidence

Form 4 shows a planned open-market sale by the CEO, with no accompanying guidance, earnings, or company-specific adverse event in the filing text.

Market effects

Sector

No direct sector read-across; this is company-specific insider transaction data.

Regional

None indicated.

Global

None indicated.

Counterpoint

What could challenge this read

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

Key entities

  • issuer
    MAGNITE, INC.

    Public company whose CEO filed the Form 4 insider sale disclosure.

  • insider
    BARRETT MICHAEL G.

    CEO and officer/director who sold 38,596 shares 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.

MGNI insider trading history →

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