Marathon Petroleum (NYSE: MPC) CEO has 908 shares withheld for tax or exercise costs

Rhea-AI Filing Summary

Marathon Petroleum Corp's Chairman, President and CEO Maryann T. Mannen had 908 shares of common stock withheld on 2026-08-03 to satisfy exercise-price or tax obligations at $311.78 per share. After this disposition, she directly holds 110,939 shares of Marathon Petroleum common stock.

Insider Trade Summary

Net Seller: 908 shares

Net Sell 1 txn

Insider Mannen Maryann T.

Role Chairman, President & CEO

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	908	$311.78	$283K

Holdings After Transaction: Common Stock — 110,939 shares (Direct)

Key Figures

Shares withheld: 908 shares Per-share value for withholding: $311.78 per share Shares owned after transaction: 110,939 shares

3 metrics

Shares withheld 908 shares Common stock withheld to satisfy exercise-price or tax obligations on 2026-08-03

Per-share value for withholding $311.78 per share Value used for the 908-share withholding transaction coded F

Shares owned after transaction 110,939 shares Directly held Marathon Petroleum common stock following the withholding

Key Terms

exercise price, tax liability, withholding securities

3 terms

exercise price financial

"Payment of exercise price or tax liability by delivering or withholding securities"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

tax liability financial

"Payment of exercise price or tax liability by delivering or withholding securities"

withholding securities financial

"Payment of exercise price or tax liability by delivering or withholding securities"

AI-generated analysis. How Rhea-AI works. Not financial advice.

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/04/2026 - 04:40 PM Accepted by SEC EDGAR 08/04/2026 - 04:39 PM Learn about SEC filing dates

FAQ

What insider transaction did Marathon Petroleum (MPC) report for Maryann T. Mannen?

Marathon Petroleum reported that CEO Maryann T. Mannen had 908 common shares withheld on 2026-08-03 to cover exercise-price or tax obligations at $311.78 per share, leaving her with 110,939 directly held shares in the company.

Was the Marathon Petroleum (MPC) CEO’s Form 4 transaction a market sale?

The Form 4 shows no open-market sale; instead, 908 shares of common stock were withheld to pay exercise-price or tax obligations, a disposition coded as "F" rather than a normal purchase or sale transaction in the open market.

How many Marathon Petroleum (MPC) shares does CEO Maryann T. Mannen hold after this transaction?

Following the reported tax or exercise-price withholding of 908 shares, CEO Maryann T. Mannen directly owns 110,939 shares of Marathon Petroleum common stock, as disclosed in the Form 4 insider ownership table for this transaction.

What price per share applied to the CEO’s withheld Marathon Petroleum (MPC) shares?

The 908 withheld shares of Marathon Petroleum common stock were valued at $311.78 per share for this transaction, reflecting the price used to satisfy the exercise-price or tax-liability obligation associated with the equity compensation event.

How is the Form 4 transaction for Marathon Petroleum (MPC) coded and what does it mean?

The transaction is coded "F", described as "Payment of exercise price or tax liability by delivering or withholding securities," meaning 908 shares were disposed of through withholding rather than sold in a traditional open-market transaction.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a 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). See Instruction 10.

1. Name and Address of Reporting Person^*

Mannen Maryann T.

(Last) (First) (Middle)

C/O MARATHON PETROLEUM CORPORATION

539 S. MAIN STREET

(Street)

FINDLAY OHIO 45840

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Marathon Petroleum Corp [ MPC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chairman, President & CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/03/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/03/2026		F		908	D	$311.78	110,939	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Chairman of the Board, President and Chief Executive Officer

	/s/ Molly R. Benson, Attorney-in-Fact for Maryann T. Mannen	08/04/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)