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MPC SEC Filing News — Marathon Petroleum Corporation

Latest SEC filings for Marathon Petroleum Corporation (MPC) explained in plain English: insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). Sourced directly from SEC EDGAR.

What you’re looking at: Each item below is parsed from an actual SEC filing. Form 4 = confirmed insider transaction · Form 144 = proposed sale notice · 8-K = material event (earnings, M&A, leadership change, etc.) · 10-Q / 10-K = quarterly / annual report.
Form 8-K Material Company Update 2026-04-13

MPC filed 8-K — material company event

Marathon Petroleum Corp filed an 8-K with the SEC reporting a material event. Filing excerpt: XBRL Viewer

Filing: 8-K (Material Event)
Form 144 Large Proposed Insider Sale 2026-03-24

MPC Form 144 filed for proposed insider sale by Hennigan Michael J (25,000 shares) ~$12.11M

Hennigan Michael J filed a Form 144 with the SEC indicating intent to sell MPC (Marathon Petroleum Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4. The proposed dollar value is large enough to merit attention.

Filing: Form 144 (Proposed Sale Notice) Insider: Hennigan Michael J Shares: 25,000 Est. Value: $12.11M
Form 144 Large Proposed Insider Sale 2026-03-19

MPC Form 144 filed for proposed insider sale by Hennigan Michael J (25,000 shares) ~$11.97M

Hennigan Michael J filed a Form 144 with the SEC indicating intent to sell MPC (Marathon Petroleum Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4. The proposed dollar value is large enough to merit attention.

Filing: Form 144 (Proposed Sale Notice) Insider: Hennigan Michael J Shares: 25,000 Est. Value: $11.97M
Form 4 Insider Selling 2026-03-17

MPC insider Hessling Ricky D. (Chief Commercial Officer) sold 1,626 shares (~$371.0K)

Hessling Ricky D., listed as Chief Commercial Officer at Marathon Petroleum Corp, reported an open-market sale of 1,626 MPC shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

Filing: Form 4 (Insider Transaction) Insider: Hessling Ricky D. (Chief Commercial Officer) Shares: 1,626 Est. Value: $371.0K
Form 144 Proposed Insider Sale 2026-03-13

MPC Form 144 filed for proposed insider sale by Hessling Ricky D. (1,626 shares) ~$742.0K

Hessling Ricky D. filed a Form 144 with the SEC indicating intent to sell MPC (Marathon Petroleum Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Hessling Ricky D. Shares: 1,626 Est. Value: $742.0K
Form 4 Insider Selling 2026-03-13

MPC insider Hessling Ricky D. (Chief Commercial Officer) sold 2,847 shares (~$644.4K)

Hessling Ricky D., listed as Chief Commercial Officer at Marathon Petroleum Corp, reported an open-market sale of 2,847 MPC shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

Filing: Form 4 (Insider Transaction) Insider: Hessling Ricky D. (Chief Commercial Officer) Shares: 2,847 Est. Value: $644.4K
Form 4 Tax / Compensation Filing 2026-03-13

MPC insider Form 4 filed for equity award, exercise, or tax withholding

Lyon Shawn M (SVP Log & Storage, MPLX GP LLC) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: Lyon Shawn M (SVP Log & Storage, MPLX GP LLC) Shares: 1,186
Form 144 Proposed Insider Sale 2026-03-12

MPC Form 144 filed for proposed insider sale by Hessling Ricky D. (1,037 shares) ~$475.1K

Hessling Ricky D. filed a Form 144 with the SEC indicating intent to sell MPC (Marathon Petroleum Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Hessling Ricky D. Shares: 1,037 Est. Value: $475.1K
Form 144 Proposed Insider Sale 2026-03-11

MPC Form 144 filed for proposed insider sale by Hessling Ricky D. (1,810 shares) ~$813.7K

Hessling Ricky D. filed a Form 144 with the SEC indicating intent to sell MPC (Marathon Petroleum Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Hessling Ricky D. Shares: 1,810 Est. Value: $813.7K
Form 144 Proposed Insider Sale 2026-03-11

MPC Form 144 filed for proposed insider sale by Quaid John J (5,000 shares) ~$2.24M

Quaid John J filed a Form 144 with the SEC indicating intent to sell MPC (Marathon Petroleum Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Quaid John J Shares: 5,000 Est. Value: $2.24M
Form 144 Large Proposed Insider Sale 2026-03-06

MPC Form 144 filed for proposed insider sale by Hennigan Michael J (25,000 shares) ~$10.95M

Hennigan Michael J filed a Form 144 with the SEC indicating intent to sell MPC (Marathon Petroleum Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4. The proposed dollar value is large enough to merit attention.

Filing: Form 144 (Proposed Sale Notice) Insider: Hennigan Michael J Shares: 25,000 Est. Value: $10.95M
Form 4 Tax / Compensation Filing 2026-03-03

MPC insider Form 4 filed for equity award, exercise, or tax withholding

Mannen Maryann T. (Director, Chairman, President & CEO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: Mannen Maryann T. (Director, Chairman, President & CEO) Shares: 19,232
Form 4 Tax / Compensation Filing 2026-03-03

MPC insider Form 4 filed for equity award, exercise, or tax withholding

Khoury Maria A (Exec VP & Chief Fin Ofc) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: Khoury Maria A (Exec VP & Chief Fin Ofc) Shares: 2,443
Form 4 Tax / Compensation Filing 2026-03-03

MPC insider Form 4 filed for equity award, exercise, or tax withholding

Lyon Shawn M (SVP Log & Storage, MPLX GP LLC) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: Lyon Shawn M (SVP Log & Storage, MPLX GP LLC) Shares: 2,503
Form 4 Tax / Compensation Filing 2026-03-03

MPC insider Form 4 filed for equity award, exercise, or tax withholding

Hessling Ricky D. (Chief Commercial Officer) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: Hessling Ricky D. (Chief Commercial Officer) Shares: 5,562
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