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SEC EDGAR$MGNI

Buckley Sean Patrick sold $270K of MGNI

Buckley Sean Patrick (See Remarks) sold 11,030 shares of MAGNITE, INC. (MGNI) at an average of $24.48 ($24.31–$25.00, $0.27M total) across 2 trades over 2026-08-17 to 2026-08-18 under a Rule 10b5-1 trading plan.

Original reporting
SEC EDGAR · Buckley Sean Patrick
Published Aug 18, 2026, 8:14 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Aug 18, 2026, 8:41 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
3/10
AlphAI data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$MGNINeutralLow
01

Why it matters

The disclosure updates the record of insider activity, but it does not introduce new company fundamentals or forward-looking guidance.

02

Market read

MGNI receives a fresh insider-sale datapoint, but the 10b5-1 framing reduces the likelihood of a material repricing catalyst.

03

What to watch

Traders may over-weight insider sales; without concurrent guidance, contract, or earnings changes, the informational content is limited.

Relevance 3/10Novelty 3/10Timing: filed 2026-08-18, covering sales on 2026-08-17 to 2026-08-18

Background

The article is an SEC Form 4 insider transaction for Magnite, Inc. (MGNI) filed on 2026-08-18.

Company-level read

Ticker impact

$MGNINeutralHigh confidence
Context

Magnite Form 4 shows officer Buckley Sean Patrick sold 11,030 shares in open-market trades for about $270,043 under a 10b5-1 plan.

Expected impact

Likely limited, with any impact more sentiment-driven than fundamental.

Evidence & confidence

The filing is an SEC Form 4 insider transaction with a pre-arranged 10b5-1 plan; the article provides no accompanying operational, financial, or regulatory change.

Market effects

Sector

No sector-wide signal; this is company-specific insider trading disclosure.

Regional

None indicated.

Global

None indicated.

Counterpoint

What could challenge this read

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

Key entities

  • issuer
    MAGNITE, INC.

    Subject of the Form 4 insider sale disclosure.

  • insider
    Buckley Sean Patrick

    Officer who executed open-market sales 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.

MGNI insider trading history →

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