Marathon Petroleum exec sells 1,425 shares

Marathon Petroleum Corp (MPC) reported that Shawn M. Lyon, Senior Vice President, Logistics and Storage of MPLX GP LLC (a subsidiary of Marathon Petroleum), sold common stock in two transactions.

Rhea-AI Filing Summary

Marathon Petroleum Corp (MPC) reported that Shawn M. Lyon, Senior Vice President, Logistics and Storage of MPLX GP LLC (a subsidiary of Marathon Petroleum), sold common stock in two transactions. On August 31, 2026, he sold 1,000 shares at $375.75 per share in an open-market or private transaction. On August 28, 2026, he sold 425 shares at a weighted average price of $368.51 per share, with individual sale prices ranging from $368.43 to $368.53. Following these transactions, an indirect holding of 2,938.762 shares is reported as held by a 401(k) plan. The Rule 10b5-1 trading plan checkbox was not marked.

Insider Trade Summary

Net Seller: 1,425 shares

Net Sell 3 txns

Insider Lyon Shawn M

Role SVP Log & Storage, MPLX GP LLC

Sold 1,425 shs ($532K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,000	$375.75	$376K
Sale	Common Stock F1	425	$368.51	$157K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 11,194 shares (Direct); Common Stock — 2,938.762 shares (Indirect, By 401(k) Plan)

Footnotes (1)

1. F1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $368.43 to $368.53. The reporting person undertakes to provide to Marathon Petroleum Corporation, any security holder of Marathon Petroleum Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote 1 to this Form 4.

Key Figures

Shares sold on 2026-08-31: 1,000 shares of Common Stock Price per share on 2026-08-31: $375.75 per share Shares sold on 2026-08-28: 425 shares of Common Stock +3 more

6 metrics

Shares sold on 2026-08-31 1,000 shares of Common Stock Open-market or private sale on August 31, 2026

Price per share on 2026-08-31 $375.75 per share Sale of 1,000 shares on August 31, 2026

Shares sold on 2026-08-28 425 shares of Common Stock Open-market or private sale on August 28, 2026

Weighted average price on 2026-08-28 $368.51 per share Shares sold in multiple transactions from $368.43 to $368.53

Total shares sold 1,425 shares Combined sales on August 28 and August 31, 2026

Indirect 401(k) holdings 2,938.762 shares of Common Stock Indirect ownership by 401(k) Plan as of August 28, 2026

Key Terms

weighted average price, Rule 10b5-1 trading plan, indirect ownership, 401(k) Plan, +1 more

5 terms

weighted average price financial

"These shares were sold in multiple transactions at prices ranging from"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

Rule 10b5-1 trading plan regulatory

"The filing’s Rule 10b5-1 checkbox is not marked, and there is no"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

indirect ownership financial

"An indirect holding of 2,938.762 shares is reported as held by a 401(k)"

401(k) Plan financial

"An indirect holding of 2,938.762 shares is reported as held by a 401(k)"

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.

open-market or private transaction financial

"Sale in open market or private transaction"

FAQ

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

What insider transactions were reported for MPC on this Form 4?

The filing reports that Shawn M. Lyon sold 1,425 shares of Marathon Petroleum Corp common stock in two transactions, on August 28, 2026 and August 31, 2026, in open-market or private transactions.

At what prices did Shawn M. Lyon sell MPC shares?

He sold 1,000 shares at $375.75 per share on August 31, 2026. On August 28, 2026, he sold 425 shares at a weighted average price of $368.51 per share, with prices ranging from $368.43 to $368.53.

How many Marathon Petroleum (MPC) shares did the insider sell in total?

Shawn M. Lyon sold a total of 1,425 shares of Marathon Petroleum Corp common stock, consisting of 1,000 shares on August 31, 2026 and 425 shares on August 28, 2026.

Does Shawn M. Lyon still hold MPC shares after these transactions?

Yes. The Form 4 reports an indirect holding of 2,938.762 shares of Marathon Petroleum Corp common stock, held by a 401(k) Plan as of August 28, 2026.

Were the MPC insider sales under a Rule 10b5-1 trading plan?

No. The filing’s Rule 10b5-1 checkbox is not marked, and there is no footnote stating that these transactions were effected pursuant to a Rule 10b5-1 trading plan.

What is the role of the reporting person in relation to MPC?

The reporting person, Shawn M. Lyon, is the Senior Vice President, Logistics and Storage of MPLX GP LLC, which is a subsidiary of Marathon Petroleum Corp.

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

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Available on EDGAR 09/01/2026 - 04:41 PM EDT Accepted by SEC EDGAR 09/01/2026 - 04:40 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)
08/28/2026

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	08/28/2026		S		425	D	$368.51(1)	12,194	D
Common Stock	08/31/2026		S		1,000	D	$375.75	11,194	D
Common Stock								2,938.762	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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $368.43 to $368.53. The reporting person undertakes to provide to Marathon Petroleum Corporation, any security holder of Marathon Petroleum Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote 1 to this Form 4.

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	09/01/2026
	** 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)