Form 4: Magnite CTO Sells Shares for Tax Obligations

Magnite's Chief Technology Officer, David Buonasera, reported a sale of 7,129 common shares to cover tax withholding obligations related to RSU vesting, while also acquiring 324 shares through an ESPP.

Summary

• David Buonasera, Magnite's Chief Technology Officer, reported a transaction on November 15, 2025.
• He disposed of 7,129 shares of common stock at a price of $14.15 per share.
• This disposition was a non-discretionary forfeiture to cover tax withholding obligations associated with the vesting of restricted stock units.
• Following this transaction, Buonasera beneficially owns 231,824 shares of Magnite common stock.
• The reported beneficial ownership includes 324 shares acquired on November 15, 2025, through the Issuer's Employee Stock Purchase Plan.
• The transaction was made pursuant to a contract, instruction, or written plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Sentiment

Score: 5

Explanation: The transaction is neutral as it represents a routine, pre-planned event for tax purposes related to executive compensation, not a discretionary sale based on market outlook. The ESPP acquisition is a minor positive.

Positives

• The Chief Technology Officer acquired 324 shares through the Employee Stock Purchase Plan, indicating continued investment in the company.
• The underlying event, the vesting of restricted stock units, represents a positive compensation event for the executive.

Negatives

• The Chief Technology Officer disposed of 7,129 shares of common stock, reducing his direct ownership, although this was for tax purposes.

Future Outlook

No specific future outlook or guidance is provided in this insider transaction report.

Industry Context

This is a routine insider transaction report and does not provide information directly related to broader industry trends or competitors.

Corporate Governance

Stakeholder Impact

• Shareholders: Minimal impact as the transaction is a routine, tax-related sale by an insider, not indicative of a change in company fundamentals or management's confidence.
• Employees (specifically David Buonasera): The transaction reflects the realization of compensation through RSU vesting and participation in the Employee Stock Purchase Plan.

Key Dates

Recommendation

The filing details a routine insider transaction where the Chief Technology Officer sold shares to cover tax obligations related to RSU vesting, a common and pre-planned event. This transaction does not reflect a change in the company's fundamentals or management's long-term outlook, nor does it provide new information warranting a change in investment recommendation.

Keywords

Magnite, MGNI, Form 4, insider transaction, stock sale, CTO, David Buonasera, RSU, tax withholding, ESPP, Rule 10b5-1