Knopper Douglas S sold $676K of MGNI

Knopper Douglas S sold 37,337 shares of MAGNITE, INC. (MGNI) at $18.10 ($0.68M total) on 2026-06-16 under a Rule 10b5-1 trading plan.

Original reporting
SEC EDGAR · Knopper Douglas S
Published Jun 17, 2026, 10:48 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Jun 17, 2026, 10:52 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.
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 disclosure updates the record of insider activity but does not introduce new operational, financial, or regulatory information about Magnite.

02

Market read

Traders may note the insider sale for sentiment/positioning, but the 10b5-1 structure reduces the informational content versus unscheduled selling.

03

What to watch

The article provides only the sale details; it does not include any offsetting insider buys, changes in other ownership, or broader company news that would contextualize whether the sale is unusual.

Relevance 4/10Novelty 4/10Timing: Filed June 17, 2026; sale dated June 16, 2026.

Background

This is an SEC Form 4 insider transaction for Magnite, Inc. (MGNI), reporting an open-market sale by a director under a pre-arranged Rule 10b5-1 plan.

Company-level read

Ticker impact

$MGNINeutralHigh confidence
Context

Magnite director Knopper Douglas S sold 37,337 shares in an open-market transaction for about $675.8K under a 10b5-1 plan.

Expected impact

Likely limited immediate price impact; any effect would be sentiment-driven and short-lived.

Evidence & confidence

The filing is a routine Form 4 showing a pre-arranged 10b5-1 sale; it does not disclose new company fundamentals, guidance, or regulatory/operational events.

Market effects

No direct sector read-through; this is company-specific insider transaction disclosure.

None indicated.

None indicated.

Counterpoint

Even with a 10b5-1 plan, repeated insider selling can still be interpreted by some traders as a lack of conviction, especially if it coincides with other negative signals not mentioned here.

Key entities

  • MAGNITE, INC.

    Subject of the Form 4 insider sale disclosure.

  • Knopper Douglas S

    Director who sold 37,337 shares on June 16, 2026 under a 10b5-1 plan.

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.

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