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Marathon Petroleum Corp

For the period ended Sep 30, 2026. Filed Nov 3, 2026.

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About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Sep 30, 2026 · Filed Nov 3, 2026

MPC$389.55-0.1%Stored close · as of Nov 10, 2026

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22. Pension and Other Postretirement Benefits

  1. Pension and Other Postretirement Benefits

The following summarizes the components of net periodic benefit costs:

Three Months Ended September 30,Nine Months Ended September 30,
(In millions)2026202520262025
Pension Benefits
Service cost$56$56$180$168
Interest cost3836115108
Expected return on plan assets(39)(36)(117)(108)
Amortization of prior service credit(3)(2)(7)(6)
Amortization of actuarial loss341212
Settlement (gain) loss(1)—(1)1
Net periodic pension benefit cost$54$58$182$175
Other Benefits
Service cost$4$5$14$15
Interest cost992626
Amortization of prior service credit(5)(5)(16)(16)
Net periodic other benefit cost$8$9$24$25

The components of net periodic benefit cost, other than the service cost component, are included in Net interest and other financial costs on the Consolidated Statements of Income.

During the nine months ended September 30, 2026, we made contributions of $263 million to our funded pension plans. Benefit payments related to unfunded pension and other postretirement benefit plans were $16 million and $40 million, respectively, during the nine months ended September 30, 2026.

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