Form 4: Magnite President Sells 40,000 Shares Under 10b5-1 Plan

Magnite's President of Revenue, Sean Patrick Buckley, sold 40,000 shares of common stock in two pre-planned transactions on September 8 and 9, 2025.

Summary

• Sean Patrick Buckley, President of Revenue at Magnite, Inc. (MGNI), reported the sale of 40,000 shares of common stock.
• The transactions occurred on September 8, 2025, and September 9, 2025.
• On September 8, 2025, 20,000 shares were sold at a weighted average price of $25.56 per share, with prices ranging from $25.50 to $25.69.
• On September 9, 2025, an additional 20,000 shares were sold at a weighted average price of $24.61 per share, with prices ranging from $24.51 to $25.07.
• These sales were conducted pursuant to a Rule 10b5-1(c) contract, instruction, or written plan.
• Following these transactions, Sean Patrick Buckley beneficially owns 287,193 shares of Magnite common stock.

Sentiment

Score: 5

Explanation: The insider sales were conducted under a pre-arranged Rule 10b5-1 plan, which typically indicates a scheduled liquidity event rather than a reaction to new information, thus having a neutral to slightly negative market sentiment.

Positives

• The sales were executed under a pre-arranged Rule 10b5-1 trading plan, indicating they were scheduled in advance and not based on new, non-public information, which mitigates the negative perception often associated with insider sales.

Negatives

• Insider sales, even when pre-planned, reduce the overall insider ownership percentage, which some investors may view as a slight negative signal regarding management's conviction in the company's future stock price.

Future Outlook

This Form 4 filing does not contain any forward-looking statements or guidance regarding Magnite's future performance or outlook.

Management Comments

• The reporting person undertakes to provide full information regarding the number of shares sold at each separate price within the reported ranges upon request to the Issuer, any security holder, or the SEC staff.

Industry Context

This filing reports an individual insider transaction and does not provide information directly related to broader industry trends or competitive landscape within the ad tech sector.

Corporate Governance

Stakeholder Impact

• Shareholders: May view the reduction in insider ownership with slight caution, though the 10b5-1 plan mitigates concerns about the timing of the sales.
• Employees: No direct impact mentioned.

Key Dates

Recommendation

The insider sales were executed under a Rule 10b5-1 plan, suggesting a pre-scheduled liquidity event rather than a reaction to new material information. While insider sales can sometimes be a negative signal, the pre-planned nature mitigates this concern, leading to a 'hold' recommendation as this filing alone does not provide sufficient new information to alter a fundamental investment thesis.

Keywords

Magnite, MGNI, Insider Trading, Form 4, Stock Sale, Sean Patrick Buckley, 10b5-1 Plan, Ad Tech