MPLX LP

8. 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 type of service basis. MPLX hastwo reportable segments: L&S and G&P. Each of these segments is organized and managed based upon the nature of the products and services it offers.

•L&S – 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.

•G&P – 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. 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 revenues and other income, Segment Adjusted EBITDA, capital expenditures and investments in unconsolidated affiliates for our reportable segments:

(1)Within the total segment revenues and other income amounts presented above, third party revenues for the L&S segment were $196 million and $779 million for the three and nine months ended September 30, 2024, respectively, and $207 million and $564 million for the three and nine months ended September 30, 2023, respectively. Third party revenues for the G&P segment were $1,285 million and $3,705 million for the three and nine months ended September 30, 2024, respectively, and $1,248 million and $3,553 million for the three and nine months ended September 30, 2023, respectively.

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

(3)The nine months ended September 30, 2024 includes a contribution of $92 million to Dakota Access to fund our share of a debt repayment by the joint venture.

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

(1)Depreciation and amortization attributable to L&S was $132 million and $393 million for the three and nine months ended September 30, 2024, respectively, and $130 million and $399 million for the three and nine months ended September 30, 2023, respectively. Depreciation and amortization attributable to G&P was $190 million and $566 million for the three and nine months ended September 30, 2024, respectively, and $171 million and $508 million for the three and nine months ended September 30, 2023, 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 $63 million of incident response costs during the three and nine months ended September 30, 2023.

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