Form 4: Magnite CTO Sells Shares Under 10b5-1 Plan

Magnite, Inc. Chief Technology Officer David Buonasera reported the sale of 1,224 shares of common stock on July 7, 2026, executed under a pre-arranged Rule 10b5-1 trading plan.

Summary

• David Buonasera, Chief Technology Officer of Magnite, Inc., sold 1,224 shares of common stock on July 7, 2026.
• The transaction was conducted under a Rule 10b5-1 trading plan adopted by Buonasera on September 11, 2025.
• The sale price was $21 per share.
• Following this transaction, Buonasera beneficially owns 268,485 shares of common stock.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral filing. While it involves an insider sale, the transaction was executed under a pre-established Rule 10b5-1 plan, mitigating concerns about opportunistic trading.

Negatives

• Insider selling of company stock can sometimes be perceived negatively by the market, although this sale was conducted under a pre-established trading plan.

Future Outlook

No forward-looking statements or guidance are present in this filing, as it solely reports a past transaction.

Industry Context

StockSavvy.ai notes that insider sales under Rule 10b5-1 plans are common and are designed to provide an affirmative defense against allegations of insider trading by allowing executives to sell shares at predetermined times and prices. This filing indicates standard executive compensation and liquidity management practices within the ad-tech industry.

Stakeholder Impact

• Shareholders: The sale by a key executive might be monitored, but the Rule 10b5-1 plan context suggests it's a planned liquidity event rather than a signal of negative outlook.

Key Dates

Keywords

Magnite, MGNI, Form 4, Insider Trading, Stock Sale, Rule 10b5-1, David Buonasera, Chief Technology Officer