Buonasera David sold $21K of MGNI

Buonasera David (CHIEF TECHNOLOGY OFFICER) sold 1,409 shares of MAGNITE, INC. (MGNI) at $15.00 on 2026-06-01 under a Rule 10b5-1 trading plan.

Original reporting
SEC EDGAR · Buonasera David
Published Jun 3, 2026, 8:45 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Jun 3, 2026, 8:50 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
6/10
AlphAI data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$MGNINeutralLow
01

Why it matters

The disclosure can marginally influence sentiment, but it does not provide new information about Magnite’s business or outlook.

02

Market read

A routine insider sale disclosure for MGNI; likely limited trading impact absent other catalysts.

03

What to watch

Traders should check for the broader pattern of insider activity (frequency/size across recent Form 4s) rather than a single sale.

Relevance 6/10Novelty 2/10Timing: Filed June 3 after the June 1 sale; no immediate trading catalyst implied.

Background

SEC Form 4 reports insider transactions; this one is an open-market sale by the CTO with a pre-arranged 10b5-1 plan.

Company-level read

Ticker impact

$MGNINeutralHigh confidence
Context

Magnite CTO Buonasera David sold 1,409 shares in an open-market transaction under a pre-arranged 10b5-1 plan on June 1.

Expected impact

Low near-term impact; any reaction is likely limited to sentiment/flow rather than fundamentals.

Evidence & confidence

The filing is a routine SEC Form 4 insider sale with a stated pre-arranged 10b5-1 plan and no accompanying company-specific news (earnings, guidance, deal, or litigation).

Market effects

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

None indicated.

None indicated.

Counterpoint

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

Key entities

  • MAGNITE, INC.

    Subject of the insider transaction disclosure (SEC Form 4).

  • Buonasera David

    Chief Technology Officer who sold shares 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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