Form 4: Magnite CAO Sells Shares for Tax Obligations

Magnite's Chief Accounting Officer, Brian Gephart, disposed of 3,549 shares of common stock to cover tax withholding obligations related to restricted stock unit vesting.

Summary

• Brian Gephart, Chief Accounting Officer of Magnite, Inc. (MGNI), reported a transaction involving the company's common stock.
• On November 15, 2025, Gephart disposed of 3,549 shares of common stock.
• The shares were disposed of at a price of $14.15 per share.
• This transaction was a non-discretionary forfeiture of shares to cover tax withholding obligations associated with the vesting of restricted stock units.
• Following this transaction, Gephart beneficially owns 89,349 shares of Magnite common stock directly.
• The transaction was made pursuant to a contract, instruction, or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Sentiment

Score: 5

Explanation: The sentiment is neutral as this is a routine, non-discretionary transaction for tax purposes related to RSU vesting, and does not reflect a change in management's outlook or a discretionary sale/purchase.

Positives

• The underlying event for the share disposition is the vesting of restricted stock units, which represents compensation earned by the Chief Accounting Officer.

Negatives

• The transaction resulted in a reduction of 3,549 shares from the Chief Accounting Officer's direct beneficial ownership.

Future Outlook

This filing does not contain any forward-looking statements or guidance regarding the company's future performance or outlook.

Industry Context

This is a routine insider transaction related to executive compensation and tax obligations, which is common across all industries for publicly traded companies with equity compensation plans.

Comparison to Industry Standards

• The disposition of shares to cover tax withholding upon RSU vesting is a standard practice for executives receiving equity compensation across various industries, including technology and media, and is not indicative of specific company performance or management sentiment.

Stakeholder Impact

• Shareholders: A minor, non-discretionary reduction in insider ownership, which is a common administrative event and generally has no significant impact on shareholder value or perception.
• Employees: The transaction is a result of equity compensation vesting, which is a positive for the employee (Chief Accounting Officer) as it represents earned compensation.

Key Dates

Recommendation

This Form 4 reports a routine, non-discretionary sale of shares by an insider to cover tax obligations upon the vesting of restricted stock units. Such transactions are administrative in nature and do not typically signal a change in the company's fundamentals or management's confidence. Therefore, it provides no new information to alter an existing investment thesis, warranting a 'hold' recommendation.

Keywords

Magnite, MGNI, Form 4, Insider Transaction, Stock Sale, Tax Withholding, RSU Vesting, Brian Gephart, Chief Accounting Officer