Marathon Petroleum SVP sells 2,500 shares at $350

Marathon Petroleum Corp (MPC) senior vice president Shawn M. Lyon reported an open-market sale of 2,500 shares of common stock at $350.00 per share on 2026-08-13.

Rhea-AI Filing Summary

Marathon Petroleum Corp (MPC) senior vice president Shawn M. Lyon reported an open-market sale of 2,500 shares of common stock at $350.00 per share on 2026-08-13. Following this transaction, he holds 12,619 MPC shares directly and 2,938.762 shares indirectly through a 401(k) plan, which includes small amounts from dividend reinvestment and an administrative fee adjustment.

Insider Trade Summary

Net Seller: 2,500 shares

Net Sell 2 txns

Insider Lyon Shawn M

Role SVP Log & Storage, MPLX GP LLC

Sold 2,500 shs ($875K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,500	$350.00	$875K
holding	Common Stock F1	--	--	--

Holdings After Transaction: Common Stock — 12,619 shares (Direct); Common Stock — 2,938.762 shares (Indirect, By 401(k) Plan)

Footnotes (1)

1. F1. Includes 11.168 shares acquired pursuant to dividend reinvestment and not previously reported pursuant to Rule 16a-11. Also reflects the deduction of an administrative fee in the amount of 0.018 shares.

Key Figures

Shares sold: 2,500 shares Sale price per share: $350.00 per share Direct holdings after transaction: 12,619 shares +4 more

7 metrics

Shares sold 2,500 shares Common Stock sale on 2026-08-13

Sale price per share $350.00 per share Price for the 2,500-share Common Stock sale

Direct holdings after transaction 12,619 shares Direct MPC common stock owned after the reported sale

Indirect 401(k) holdings after transaction 2,938.762 shares MPC shares held indirectly through 401(k) Plan

Dividend reinvestment shares in 401(k) 11.168 shares Shares acquired via dividend reinvestment in 401(k) Plan

Administrative fee share deduction 0.018 shares Shares deducted as an administrative fee from 401(k) holdings

Net shares sold 2,500 shares Net sell volume across reported transactions

Key Terms

dividend reinvestment, administrative fee, Rule 16a-11, 401(k) Plan

4 terms

dividend reinvestment financial

"Includes 11.168 shares acquired pursuant to dividend reinvestment"

Dividend reinvestment is when the money earned from a company's profit sharing, called dividends, is automatically used to buy more shares of that company instead of being received as cash. This process helps investors grow their holdings over time without extra effort, much like using earned interest to buy more of a savings account. It encourages long-term investment growth by continuously increasing the amount of shares owned.

administrative fee financial

"Also reflects the deduction of an administrative fee in the amount"

Rule 16a-11 regulatory

"not previously reported pursuant to Rule 16a-11"

401(k) Plan financial

"nature_of_ownership":"By 401(k) Plan""

A 401(k) plan is a workplace retirement account that lets employees set aside part of their pay into a tax-advantaged savings pot, often with employers adding matching contributions — like a workplace piggy bank for future income. It matters to investors because the amount people save and how employers fund these plans influence consumer spending, corporate payroll costs and the flow of money into financial markets, which can affect stock prices and company valuations.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Shawn M. Lyon report for MPC?

Shawn M. Lyon reported selling 2,500 shares of Marathon Petroleum Corp common stock at $350.00 per share on 2026-08-13. After the sale, he retained substantial direct and 401(k) plan holdings in MPC shares.

How many Marathon Petroleum Corp (MPC) shares did Shawn M. Lyon sell?

He sold 2,500 MPC shares in a transaction dated 2026-08-13. The sale was reported as common stock, categorized as a sale in open market or private transaction under Form 4 reporting rules.

What price did Shawn M. Lyon receive per MPC share in the reported sale?

The reported sale price was $350.00 per share for 2,500 Marathon Petroleum Corp common shares. This per-share price is identified as a straightforward trade price, not footnote-adjusted or averaged.

How many MPC shares does Shawn M. Lyon hold directly after this transaction?

Following the sale, he directly holds 12,619 MPC shares. This figure reflects his remaining direct ownership position in Marathon Petroleum Corp common stock after the 2,500-share disposition.

What are Shawn M. Lyon’s indirect Marathon Petroleum (MPC) holdings through his 401(k)?

His indirect 401(k) holdings total 2,938.762 MPC shares after the reported date. This amount includes 11.168 shares from dividend reinvestment and a deduction of 0.018 shares for an administrative fee.

Was the MPC insider sale by Shawn M. Lyon under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not marked as a plan trade. There is no footnote indicating a Rule 10b5-1 or pre-arranged trading plan for this reported Marathon Petroleum Corp sale.

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

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Accepted by SEC EDGAR 08/17/2026 - 05:14 PM EDT Learn about SEC filing dates

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^*

Lyon Shawn M

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP Log & Storage, MPLX GP LLC

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/13/2026

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	08/13/2026		S		2,500	D	$350	12,619	D
Common Stock								2,938.762(1)	I	By 401(k) Plan

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:

1. Includes 11.168 shares acquired pursuant to dividend reinvestment and not previously reported pursuant to Rule 16a-11. Also reflects the deduction of an administrative fee in the amount of 0.018 shares.

Remarks:

The Reporting Person is the Senior Vice President, Logistics and Storage of MPLX GP LLC, a subsidiary of the Issuer.

	/s/ Molly R. Benson, Attorney-in-Fact for Shawn M. Lyon	08/17/2026
	** 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)