Marathon Petroleum officer plans $376K sale

Marathon Petroleum Corp (MPC) is the issuer for a Rule 144 notice filed for sales by officer Shawn M. Lyon.

Rhea-AI Filing Summary

Marathon Petroleum Corp (MPC) is the issuer for a Rule 144 notice filed for sales by officer Shawn M. Lyon. The filing covers an intended sale of 1,000 shares of Marathon Petroleum common stock held through Wells Fargo Clearing Services, with an aggregate market value of $375,735.26. Shares of common stock outstanding were 280,824,763 as of 08/31/2026; this is a baseline figure, not the amount being sold. In the prior three months, Lyon reported sales of 2,500 shares on 08/13/2026 for $874,974.97 and 425 shares on 08/28/2026 for $156,608.14.

Key Figures

Shares to be sold: 1,000 shares of common stock Aggregate market value of shares to be sold: $375,735.26 Shares outstanding: 280,824,763 shares +4 more

7 metrics

Shares to be sold 1,000 shares of common stock Planned sale under Rule 144 for account of Shawn M. Lyon

Aggregate market value of shares to be sold $375,735.26 Value of 1,000 MPC common shares listed in the securities information

Shares outstanding 280,824,763 shares MPC common shares outstanding as of 08/31/2026

Shares sold on 08/13/2026 2,500 shares Past three months sale by Shawn M. Lyon

Proceeds on 08/13/2026 sale $874,974.97 Aggregate amount for 2,500 MPC common shares sold

Shares sold on 08/28/2026 425 shares Past three months sale by Shawn M. Lyon

Proceeds on 08/28/2026 sale $156,608.14 Aggregate amount for 425 MPC common shares sold

Key Terms

Rule 144, Form 144, aggregate market value, common stock

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Form 144 regulatory

"144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

aggregate market value financial

"Common | Wells Fargo Clearing Services ... | 1000 | 375735.26"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

common stock financial

"Common | Wells Fargo Clearing Services ..."

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

FAQ

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

What does the Form 144 filing related to MPC disclose about planned share sales?

The Form 144 discloses that officer Shawn M. Lyon plans to sell 1,000 shares of Marathon Petroleum common stock under Rule 144, with an aggregate market value reported as $375,735.26, from an account at Wells Fargo Clearing Services.

How many Marathon Petroleum (MPC) shares has Shawn M. Lyon sold in the past three months?

The filing lists sales by Shawn M. Lyon of 2,500 shares of MPC common stock on 08/13/2026 for $874,974.97 and 425 shares on 08/28/2026 for $156,608.14 during the past three months.

What is the reported market value of the MPC shares to be sold under this Form 144?

The notice reports that the 1,000 shares of Marathon Petroleum common stock to be sold have an aggregate market value of $375,735.26, as stated in the securities information section associated with the Rule 144 filing.

How many Marathon Petroleum (MPC) shares are outstanding as referenced in the Form 144?

The filing references 280,824,763 Marathon Petroleum common shares outstanding as of 08/31/2026. This figure is provided as context for the Rule 144 notice and is not the amount being sold.

Who is the filer of the Form 144 involving Marathon Petroleum (MPC)?

The person for whose account the securities are to be sold is Shawn M. Lyon, identified as an officer in relation to Marathon Petroleum Corp in the Rule 144 notice.

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

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Available on EDGAR 08/31/2026 - 04:49 PM EDT Accepted by SEC EDGAR 08/31/2026 - 04:48 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001948454
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Marathon Petroleum Corp
SEC File Number	001-35054
Address of Issuer	539 SOUTH MAIN STREET FINDLAY OHIO 45840-3229
Phone	419-422-2121
Name of Person for Whose Account the Securities are To Be Sold	Lyon Shawn M
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Wells Fargo Clearing Services 1 N. Jefferson Ave. St. Louis MO 63103	1000	375735.26	280824763	08/31/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	04/01/2023	Compensation	Issuer			1000	04/01/2023	n/a

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Shawn M. Lyon 539 South Main Street Findlay OH 45840-3229	Common	08/13/2026	2500	874974.97
Shawl M. Lyon 539 South Main Street Findlay OH 45840-3229	Common	08/28/2026	425	156608.14

144: Remarks and Signature

Remarks
Date of Notice	08/31/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	Shawn M. Lyon
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)