Form 4: Marathon Petroleum CEO Reports Stock Transactions

Marathon Petroleum's Chairman, President & CEO, Maryann T. Mannen, reported the acquisition of 15,266 shares and subsequent disposition of 3,966 shares for tax purposes.

Summary

• Maryann T. Mannen, Chairman, President & CEO of Marathon Petroleum Corp, reported changes in her beneficial ownership of common stock.
• On March 1, 2026, Mannen acquired 15,266 shares of common stock at a price of $0, likely as part of an equity award or grant.
• Following this acquisition, her beneficial ownership stood at 115,813 shares.
• On March 2, 2026, Mannen disposed of a total of 3,966 shares (952, 778, and 2,236 shares) at a price of $206.3 per share.
• These dispositions were marked with transaction code "F," indicating they were likely for tax withholding purposes related to the equity award.
• After all reported transactions, Mannen's direct beneficial ownership of Marathon Petroleum common stock is 111,847 shares.

Sentiment

Score: 6

Explanation: StockSavvy.ai views this as a neutral to slightly positive event. The acquisition of shares by the CEO indicates alignment of interests, while the subsequent sales are routine for tax purposes, not a discretionary sale.

Positives

• Maryann T. Mannen, Chairman, President & CEO, acquired 15,266 shares of common stock, indicating an increase in her direct equity stake in the company.

Negatives

• Maryann T. Mannen disposed of a total of 3,966 shares of common stock, primarily for tax withholding purposes, reducing her overall beneficial ownership from the peak after the acquisition.

Future Outlook

NA

Industry Context

StockSavvy.ai notes that insider transaction filings like this Form 4 provide transparency into executive compensation and equity ownership, which is a standard practice across all industries, including the energy sector where Marathon Petroleum operates. These transactions are typically routine for equity awards.

Related Party Transactions

• The reported transactions involve the Chairman, President & CEO of Marathon Petroleum Corp, Maryann T. Mannen, acquiring and disposing of company stock, which constitutes a related party transaction as defined by SEC regulations for insider reporting.

Stakeholder Impact

• Shareholders: Provides transparency into executive compensation and ownership, potentially signaling management's confidence (through acquisition) and routine tax planning (through disposition).

Key Dates

Recommendation

The reported transactions are routine for executive equity compensation and tax withholding. While the acquisition of shares by the CEO is a positive signal of alignment, the subsequent sales are non-discretionary and for tax purposes. These transactions alone do not provide new fundamental information to warrant a change in investment thesis for Marathon Petroleum Corp, hence a 'hold' recommendation is appropriate.

Keywords

Marathon Petroleum, MPC, SEC Form 4, Insider Trading, Stock Transactions, Maryann T. Mannen, CEO, Director, Equity Award, Tax Withholding