MPLX LP

10. Segment Information

MPLX’s chief operating decision maker (“CODM”) is the chief executive officer of its general partner. The CODM reviews MPLX’s discrete financial information, makes operating decisions, assesses financial performance and allocates resources on a product-based value chain basis. As discussed in Note 1, we renamed and modified the composition of our segments in the fourth quarter of 2024. The segment realignment is presented for the year ended December 31, 2024, with prior periods recast for comparability. See Note 1 for additional details. MPLX hastwo reportable segments: Crude Oil and Products Logistics and Natural Gas and NGL Services. Each of these segments is organized and managed based upon the product-based value chain each supports.

•Crude Oil and Products Logistics – gathers, transports, stores and distributes crude oil, refined products, other hydrocarbon-based products and renewables. Also includes the operation of refining logistics, fuels distribution and inland marine businesses, terminals, rail facilities and storage caverns.

•Natural Gas and NGL Services – gathers, processes and transports natural gas; and transports, fractionates, stores and markets NGLs.

Our CODM evaluates the performance of our segments using Segment Adjusted EBITDA. The CODM uses adjusted EBITDA by segment results when making decisions about allocating capital and personnel as a part of the annual business plan process and ongoing monitoring of performance. Amounts included in net income and excluded from Segment Adjusted EBITDA include: (i) depreciation and amortization; (ii) net interest and other financial costs; (iii) income/(loss) from equity method investments; (iv) distributions and adjustments related to equity method investments; (v) impairment expense; (vi) noncontrolling interests; and (vii) other adjustments as applicable. These items are either: (i) believed to be non-recurring in nature; (ii) not believed to be allocable or controlled by the segment; or (iii) are not tied to the operational performance of the segment. Assets by segment are not a measure used to assess the performance of the Partnership by our CODM and thus are not reported in our disclosures.

The tables below present information about our reportable segments:

(1)Within the total segment revenues and other income amounts presented above, third party revenues for the Crude Oil and Products Logistics segment were $746 million, $701 million and $574 million for the years ended December 31, 2024, 2023 and 2022, respectively. Third party revenues for the Natural Gas and NGL Services segment were $5,297 million, $4,902 million and $5,748 million for the years ended December 31, 2024, 2023 and 2022, respectively.

(2)Other segment items in the Crude Oil and Products Logistics segment include income from equity method investments, distributions and adjustments related to equity method investments, equity-based compensation and other miscellaneous items. Other segment items in the Natural Gas and NGL Services segment include income from equity method investments, distributions and adjustments related to equity method investments, gains on sales-type leases and equity method investments, unrealized derivative gain/loss and other miscellaneous items.

(3)See below for the reconciliation from Segment Adjusted EBITDA to Net income.

(4)Investments in unconsolidated affiliates for the Crude Oil and Products Logistics segment include contributions of $92 million and $60 million for the years ended December 31, 2024 and 2022, respectively, to Dakota Access to fund our share of debt repayments by the joint venture and exclude $18 million related to the acquisition of additional interest in Wink to Webster Pipeline LLC for the year ended December 31, 2024. Investments in unconsolidated affiliates for the Natural Gas and NGL Services segment exclude $210 million related to the acquisition of additional interests in BANGL, LLC for the year ended December 31, 2024.

(5)Includes a $151 million gain related to the dilution of ownership interest in connection with the Whistler Joint Venture Transaction in 2024.

(6)Includes a $92 million gain on remeasurement of our existing equity investment in Torñado in conjunction with the purchase of the remaining joint venture interest in 2023. Includes a $509 million gain on a lease reclassification for the year ended December 31, 2022. See Note 21 in the Consolidated Financial Statements for additional information.

The table below provides a reconciliation of Segment Adjusted EBITDA for reportable segments to Net income.

(1)Depreciation and amortization attributable to Crude Oil and Products Logistics was $526 million, $530 million and $515 million for the years ended December 31, 2024, 2023 and 2022, respectively. Depreciation and amortization attributable to Natural Gas and NGL Services was $757 million, $683 million and $715 million for the years ended December 31, 2024, 2023 and 2022, respectively.

(2)In August 2023, a naphtha release and resulting fire occurred at our Garyville Tank Farm resulting in the loss of four storage tanks with a combined shell capacity of 894 thousand barrels. We incurred $16 million of incident response costs, net of insurance recoveries, during the year ended December 31, 2023.

(3)Includes unrealized derivative gain/(loss), equity-based compensation, provision for income taxes, and other miscellaneous items.