Management's Discussion and Analysis of Financial Condition and Results of
Operations should also be read in conjunction with the unaudited consolidated
financial statements and accompanying footnotes included under Item 1. Financial
Statements and in conjunction with our Annual Report on Form 10-K for the year
ended December 31, 2021.

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Disclosures Regarding Forward-Looking Statements

This Quarterly Report on Form 10-Q, particularly Management's Discussion and
Analysis of Financial Condition and Results of Operations and Quantitative and
Qualitative Disclosures about Market Risk, includes forward-looking statements
that are subject to risks, contingencies or uncertainties. You can identify
forward-looking statements by words such as "anticipate," "believe,"
"commitment," "could," "design," "estimate," "expect," "forecast," "goal,"
"guidance," "imply," "intend," "may," "objective," "opportunity," "outlook,"
"plan," "policy," "position," "potential," "predict," "priority," "project,"
"proposition," "prospective," "pursue," "seek," "should," "strategy," "target,"
"will," "would" or other similar expressions that convey the uncertainty of
future events or outcomes.

Forward-looking statements include, among other things, statements regarding:

•future financial and operating results;

•environmental, social and governance ("ESG") goals and targets, including those related to greenhouse gas emissions, diversity and inclusion and ESG reporting;

•our plans to achieve our ESG goals and targets and to monitor and report progress thereon;

•the success or timing of completion of ongoing or anticipated capital or maintenance projects;

•the timing and amount of future distributions or unit repurchases; and

•the anticipated effects of actions of third parties such as competitors, activist investors, federal, foreign, state or local regulatory authorities, or plaintiffs in litigation.

Our forward-looking statements are not guarantees of future performance and you should not rely unduly on them, as they involve risks, uncertainties and assumptions. Material differences between actual results and any future performance suggested in our forward-looking statements could result from a variety of factors, including the following:

•the continuance or escalation of the military conflict between Russia and Ukraine, and related sanctions;



•general economic, political or regulatory developments, including inflation,
changes in governmental policies relating to refined petroleum products, crude
oil, natural gas or NGLs, or taxation;

•the magnitude, duration and extent of future resurgences of the COVID-19
pandemic and its restrictions, including travel restrictions, business and
school closures, increased remote work, stay-at-home orders and other actions
taken by individuals, governments and the private sector to stem the spread of
the virus;

•the ability of MPC to achieve its strategic objectives and the effects of those strategic decisions on us;



•further impairments;

•negative capital market conditions, including an increase of the current yield on common units;



•the ability to achieve strategic and financial objectives, including with
respect to distribution coverage, future distribution levels, proposed projects
and completed transactions;

•the success of MPC's portfolio optimization, including the ability to complete
any divestitures on commercially reasonable terms and/or within the expected
timeframe, and the effects of any such divestitures on our business, financial
condition, results of operations and cash flows;

•the adequacy of capital resources and liquidity, including the availability of
sufficient cash flow to pay distributions and access to debt on commercially
reasonable terms, and the ability to successfully execute business plans, growth
strategies and self-funding models;

•the timing and extent of changes in commodity prices and demand for crude oil, refined products, feedstocks or other hydrocarbon-based products;

•volatility in or degradation of market and industry conditions;

•changes to the expected construction costs and timing of projects and planned investments, and the ability to obtain regulatory and other approvals with respect thereto;

•completion of midstream infrastructure by competitors;

•disruptions due to equipment interruption or failure, including electrical shortages and power grid failures;

•the suspension, reduction or termination of MPC's obligations under MPLX's commercial agreements;

•modifications to financial policies, capital budgets, and earnings and distributions;

•the ability to manage disruptions in credit markets or changes to credit ratings;

•compliance with federal and state environmental, economic, health and safety, energy and other policies and regulations or enforcement actions initiated thereunder;

•adverse results in litigation;

•the effect of restructuring or reorganization of business components;

•the potential effects of changes in tariff rates on our business, financial condition, results of operations and cash flows;

•changes in foreign imports and exports of crude oil, refined products, natural gas and NGLs;



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•changes in producer customers' drilling plans or in volumes of throughput of
crude oil, natural gas, NGLs, refined products or other hydrocarbon-based
products;

•changes in the cost or availability of third-party vessels, pipelines, railcars
and other means of transportation for crude oil, natural gas, NGLs, feedstocks
and refined products;

•the price, availability and acceptance of alternative fuels and alternative-fuel vehicles and laws mandating such fuels or vehicles;

•actions taken by our competitors, including pricing adjustments and the expansion and retirement of pipeline capacity, processing, fractionation and treating facilities in response to market conditions;

•expectations regarding joint venture arrangements and other acquisitions or divestitures of assets;

•midstream and refining industry overcapacity or under capacity;

•accidents or other unscheduled shutdowns affecting our machinery, pipelines, processing, fractionation and treating facilities or equipment, means of transportation, or those of our suppliers or customers;

•acts of war, terrorism or civil unrest that could impair our ability to gather, process, fractionate or transport crude oil, natural gas, NGLs or refined products; and



•political pressure and influence of environmental groups upon policies and
decisions related to the production, gathering, refining, processing,
fractionation, transportation and marketing of crude oil or other feedstocks,
refined products, natural gas, NGLs or other hydrocarbon-based products.

For additional risk factors affecting our business, see the risk factors described in our Annual Report on Form 10-K for the year ended December 31, 2021. We undertake no obligation to update any forward-looking statement except to the extent required by applicable law.

MPLX Overview



We are a diversified, large-cap MLP formed by MPC, that owns and operates
midstream energy infrastructure and logistics assets, and provides fuels
distribution services. The business consists of two segments based on the nature
of services it offers: Logistics and Storage ("L&S"), and Gathering and
Processing ("G&P"). The L&S segment is engaged in the gathering, transportation,
storage and distribution of crude oil, refined products and other
hydrocarbon-based products. The L&S segment also includes the operation of our
refining logistics, fuels distribution and inland marine businesses, terminals,
rail facilities and storage caverns. The G&P segment provides gathering,
processing and transportation of natural gas; and the gathering, transportation,
fractionation, storage and marketing of NGLs.

Significant Financial and Other Highlights



Significant financial highlights including revenues and other income, income
from operations, net income, adjusted EBITDA attributable to MPLX and DCF
attributable to GP and LP unitholders for the three months ended March 31, 2022
and March 31, 2021 are shown in the chart below. See the Non-GAAP Financial
Information section below for the definitions of Adjusted EBITDA and DCF and the
Results of Operations section for further details regarding changes in these
metrics.
                    [[Image Removed: mplx-20220331_g1.jpg]]
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Other Highlights

•Generated net cash provided by operating activities of $1,125 million and free
cash flow of $850 million in the first quarter of 2022.
•Announced a first quarter 2022 distribution of $0.7050 per common unit,
resulting in a distribution coverage ratio of 1.65x for the first quarter.
•Returned $100 million of cash to unitholders through the repurchase of over 3
million common units under our unit repurchase program.
•Issued $1.5 billion aggregate principal amount of 4.950 percent senior notes
due March 2052 (the "2052 Senior Notes") in an underwritten public offering. The
net proceeds were used to repay amounts outstanding under the MPC Intercompany
Loan Agreement and the MPLX Credit Agreement.

Current Economic Environment



Through the first three months of 2022, we continue to see recovery in the
environment in which our business operates. We are unable to predict the
potential effects that further resurgences of COVID-19 or the continuance or
escalation of the military conflict between Russia and Ukraine may have on our
financial position and results. In response to this business environment, MPLX
remains focused on executing its strategic priorities of strict capital
discipline, embedding a low-cost culture, and portfolio optimization.

Non-GAAP Financial Information



Our management uses a variety of financial and operating metrics to analyze our
performance. These metrics are significant factors in assessing our operating
results and profitability and include the non-GAAP financial measures of
Adjusted EBITDA, DCF, free cash flow ("FCF") and free cash flow after
distributions. The amount of Adjusted EBITDA and DCF generated is considered by
the board of directors of our general partner in approving MPLX's cash
distributions. Management also utilizes Segment Adjusted EBITDA in evaluating
the financial performance of our segments. The use of this measure allows
investors to understand how management evaluates financial performance to make
operating decisions and allocate resources.

We define Adjusted EBITDA as net income adjusted for: (i) depreciation and
amortization; (ii) provision/(benefit) for income taxes; (iii) interest and
other financial costs; (iv) impairment expense; (v) income from equity method
investments; (vi) distributions and adjustments related to equity method
investments; (vii) noncontrolling interests; and (viii) other adjustments as
deemed necessary. We also use DCF, which we define as Adjusted EBITDA adjusted
for: (i) deferred revenue impacts; (ii) sales-type lease payments, net of
income; (iii) net interest and other financial costs; (iv) net maintenance
capital expenditures; (v) equity method investment capital expenditures paid
out; and (vi) other adjustments as deemed necessary. Segment Adjusted EBITDA
represents Adjusted EBITDA attributable to the reportable segments.

We define FCF as net cash provided by operating activities adjusted for (i) net
cash used in investing activities; (ii) cash contributions from MPC; (iii) cash
contributions from noncontrolling interests and (iv) cash distributions to
noncontrolling interests. We define free cash flow after distributions as FCF
less base distributions to common and preferred unitholders.

We believe that the presentation of Adjusted EBITDA, DCF, FCF and free cash flow
after distributions provides useful information to investors in assessing our
financial condition and results of operations. The GAAP measures most directly
comparable to Adjusted EBITDA and DCF are net income and net cash provided by
operating activities while the GAAP measure most directly comparable to FCF and
free cash flow after distributions is net cash provided by operating activities.
These non-GAAP financial measures should not be considered alternatives to GAAP
net income or net cash provided by operating activities as they have important
limitations as analytical tools because they exclude some but not all items that
affect net income and net cash provided by operating activities or any other
measure of financial performance or liquidity presented in accordance with GAAP.
These non-GAAP financial measures should not be considered in isolation or as
substitutes for analysis of our results as reported under GAAP. Additionally,
because non-GAAP financial measures may be defined differently by other
companies in our industry, our definitions may not be comparable to similarly
titled measures of other companies, thereby diminishing their utility. For a
reconciliation of Adjusted EBITDA and DCF to their most directly comparable
measures calculated and presented in accordance with GAAP, see the Results of
Operations section. For a reconciliation of FCF and free cash flow after
distributions to their most directly comparable measure calculated and presented
in accordance with GAAP, see the Liquidity and Capital resources section.

Comparability of our Financial Results



The Javelina divestiture, which was completed on February 12, 2021, has impacted
comparability of our financial results. Prior to the sale, Javelina was reported
within the G&P segment.

During the normal course of business, we amend or modify our contractual agreements with customers. These amendments or modifications require the agreements to be reassessed under ASC 842, which can impact the classification of revenues or costs associated with the agreement. These reassessments may impact the comparability of our financial results.


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Results of Operations

The following tables and discussion are a summary of our results of operations
for the three months ended March 31, 2022 and 2021, including a reconciliation
of Adjusted EBITDA and DCF from "Net income" and "Net cash provided by operating
activities," to the most directly comparable GAAP financial measures.

                                                                     Three Months Ended March 31,
(In millions)                                              2022                  2021                 Variance

Revenues and other income:



Total revenues and other income                      $       2,610          $      2,339          $         271
Costs and expenses:
Cost of revenues (excludes items below)                        287                   273                     14
Purchased product costs                                        467                   276                    191
Rental cost of sales                                            37                    32                      5
Rental cost of sales - related parties                          15                    39                    (24)
Purchases - related parties                                    319                   298                     21
Depreciation and amortization                                  313                   329                    (16)

General and administrative expenses                             78                    86                     (8)

Other taxes                                                     34                    32                      2
Total costs and expenses                                     1,550                 1,365                    185
Income from operations                                       1,060                   974                     86
Related party interest and other financial costs                 4                     -                      4
Interest expense, net of amounts capitalized                   198                   198                      -
Other financial costs                                           20                    27                     (7)
Income before income taxes                                     838                   749                     89
Provision for income taxes                                       5                     1                      4
Net income                                                     833                   748                     85
Less: Net income attributable to noncontrolling
interests                                                        8                     9                     (1)

Net income attributable to MPLX LP                             825                   739                     86

Adjusted EBITDA attributable to MPLX LP(1)                   1,393                 1,352                     41

DCF attributable to GP and LP unitholders(1) $ 1,178 $ 1,106 $ 72

(1) Non-GAAP measure. See reconciliation below to the most directly comparable GAAP measures.



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                                                                                Three Months Ended March 31,
(In millions)                                                         2022                  2021                 Variance

Reconciliation of Adjusted EBITDA attributable to MPLX LP and DCF attributable to GP and LP unitholders from Net income: Net income

                                                      $         833          $        748          $          85
Provision for income taxes                                                  5                     1                      4
Interest and other financial costs                                        222                   225                     (3)
Income from operations                                                  1,060                   974                     86
Depreciation and amortization                                             313                   329                    (16)

Income from equity method investments                                     (99)                  (70)                   (29)
Distributions/adjustments related to equity method investments            132                   121                     11

Other                                                                      (4)                    8                    (12)
Adjusted EBITDA                                                         1,402                 1,362                     40
Adjusted EBITDA attributable to noncontrolling interests                   (9)                  (10)                     1

Adjusted EBITDA attributable to MPLX LP                                 1,393                 1,352                     41
Deferred revenue impacts                                                   24                    22                      2
Sales-type lease payments, net of income                                    5                     -                      5
Net interest and other financial costs(1)                                (204)                 (220)                    16
Maintenance capital expenditures, net of reimbursements                   (14)                  (11)                    (3)
Equity method investment capital expenditures paid out                     (3)                   (1)                    (2)
Other                                                                       9                    (5)                    14

DCF                                                                     1,210                 1,137                     73
Preferred unit distributions                                              (32)                  (31)                    (1)
DCF attributable to GP and LP unitholders                       $       

1,178 $ 1,106 $ 72

(1) Excludes gain/ loss on extinguishment of debt and amortization of deferred financing costs.


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                                                                     Three Months Ended March 31,
(In millions)                                              2022                  2021                 Variance
Reconciliation of Adjusted EBITDA attributable to
MPLX LP and DCF attributable to GP and LP
unitholders from Net cash provided by operating
activities:
Net cash provided by operating activities            $       1,125          $      1,124          $           1
Changes in working capital items                               118                    37                     81
All other, net                                                 (45)                  (15)                   (30)
Gain on extinguishment of debt                                   -                   (12)                    12
Net interest and other financial costs(1)                      204                   220                    (16)

Other adjustments to equity method investment
distributions                                                   12                     2                     10
Other                                                          (12)                    6                    (18)
Adjusted EBITDA                                              1,402                 1,362                     40
Adjusted EBITDA attributable to noncontrolling
interests                                                       (9)                  (10)                     1

Adjusted EBITDA attributable to MPLX LP                      1,393                 1,352                     41
Deferred revenue impacts                                        24                    22                      2
Sales-type lease payments, net of income                         5                     -                      5
Net interest and other financial costs(1)                     (204)                 (220)                    16
Maintenance capital expenditures, net of
reimbursements                                                 (14)                  (11)                    (3)
Equity method investment capital expenditures paid
out                                                             (3)                   (1)                    (2)

Other                                                            9                    (5)                    14

DCF                                                          1,210                 1,137                     73
Preferred unit distributions                                   (32)                  (31)                    (1)
DCF attributable to GP and LP unitholders            $       1,178

$ 1,106 $ 72

(1) Excludes gain/ loss on extinguishment of debt and amortization of deferred financing costs.

Three months ended March 31, 2022 compared to three months ended March 31, 2021



Total revenues and other income increased $271 million in the first quarter of
2022 compared to the same period of 2021. This was primarily due to higher
prices and volumes in most regions in the G&P segment of approximately $274
million. There were also increased pipeline fees in the L&S segment due to
higher pipeline throughput outweighing decreased average tariff rates, as well
as increased equity method income across both segments. These increases were
partially offset by a loss on disposal of assets.

Cost of revenues increased $14 million in the first quarter of 2022 compared to
the same period of 2021. This was primarily due to higher environmental response
and remediation costs.

Purchased product costs increased $191 million in the first quarter of 2022
compared to the same period of 2021 This was primarily due to higher prices of
$143 million in the Southwest and Southern Appalachia and higher volumes in the
Southwest.

Rental cost of sales and rental cost of sales - related parties decreased $19
million in the first quarter of 2022 compared to the same period of 2021. This
was primarily due to modifications to lease contracts which resulted in costs
now being recorded to purchases - related parties, as noted below, as opposed to
rental cost of sales - related parties.

Purchases - related parties increased $21 million in the first quarter of 2022
compared to the same period of 2021. This was primarily due to modifications to
lease contracts which resulted in costs now being recorded to purchases -
related parties as opposed to rental cost of sales - related parties, as noted
above.

Depreciation and amortization decreased $16 million in the first quarter of 2022
compared to the same period of 2021. This was primarily due to the prior year
derecognition of assets reclassified as sales-type leases due to contract
modifications.


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Segment Results

We classify our business in the following reportable segments: L&S and G&P.
Segment Adjusted EBITDA represents Adjusted EBITDA attributable to the
reportable segments. Amounts included in net income and excluded from Segment
Adjusted EBITDA include: (i) depreciation and amortization; (ii) interest and
other financial costs; (iii) impairment expense; (iv) income/(loss) from equity
method investments; (v) distributions and adjustments related to equity method
investments; (vi) noncontrolling interests; and (vii) other adjustments as
deemed necessary. 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.

The tables below present information about Segment Adjusted EBITDA for the reported segments for the three months ended March 31, 2022 and 2021.

L&S Segment

First Quarter L&S Segment Financial Highlights (in millions)

[[Image Removed: mplx-20220331_g2.jpg]][[Image Removed: mplx-20220331_g3.jpg]]


                    [[Image Removed: mplx-20220331_g4.jpg]]

                                                                          Three Months Ended March 31,
(In millions)                                                  2022                   2021                 Variance
Service revenue                                          $         983          $         953          $          30
Rental income                                                      175                    249                    (74)
Product related revenue                                              4                      4                      -
Sales-type lease revenue                                           111                     37                     74
Income from equity method investments                               52                     36                     16
Other income                                                        12                     15                     (3)
Total segment revenues and other income                          1,337                  1,294                     43
Cost of revenues                                                   141                    144                     (3)
Purchases - related parties                                        239                    215                     24
Depreciation and amortization                                      130                    147                    (17)
General and administrative expenses                                 43                     46                     (3)

Other taxes                                                         21                     19                      2
Segment income from operations                                     763                    723                     40
Depreciation and amortization                                      130                    147                    (17)
Income from equity method investments                              (52)                   (36)                   (16)
Distributions/adjustments related to equity method
investments                                                         58                     58                      -

Other                                                                5                      4                      1

Segment adjusted EBITDA(1)                                         904                    896                      8

Capital expenditures                                                77                     59                     18
Investments in unconsolidated affiliates(2)              $          68          $           9          $          59


(1) See the Reconciliation of Adjusted EBITDA attributable to MPLX LP and DCF attributable to GP and LP unitholders from Net income table for the reconciliation to the most directly comparable GAAP measure. (2) The three months ended March 31, 2022 includes a contribution of $60 million to our Bakken Pipeline joint venture to fund our share of a debt repayment by the joint venture.


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Table of Contents Three months ended March 31, 2022 compared to three months ended March 31, 2021



Service revenue increased $30 million in the first quarter of 2022 compared to
the same period of 2021. This was primarily due to a net increase in pipeline
fees due to increased throughput outweighing lower average tariff rates, as well
as to an increase of $15 million from changes in the presentation of lease
income between service revenue, rental income and sales-type lease revenue due
to modifications to lease contracts. Fee escalations also contributed to the
increase.

Rental income decreased $74 million in the first quarter of 2022 compared to the
same period of 2021. This was primarily due to a net decrease of $88 million
from changes in the presentation of lease income between service revenue, rental
income and sales-type lease revenue due to modifications to lease contracts. The
decrease was partially offset by fee escalations.

Sales-type lease revenue - related parties increased $74 million in the first
quarter of 2022 compared to the same period of 2021. This was primarily due to
an increase of $73 million from changes in the presentation of lease income
between service revenue, rental income and sales-type lease revenue due to
modifications to lease contracts.

Income from equity methods investments increased $16 million in the first
quarter of 2022 compared to the same period of 2021. This was primarily due to
increased throughput on equity method investment pipeline systems, including the
Whistler pipeline which was placed into service in the third quarter of 2021.

Cost of revenues decreased $3 million in the first quarter of 2022 compared to
the same period of 2021. This was primarily due to modifications to lease
contracts which resulted in costs being recorded to purchases - related parties,
as noted below, as opposed to rental cost of sales - related parties, which is
included in the decrease being explained here. The decrease was partially offset
by higher environmental response and remediation costs compared to the first
quarter of 2021.

Purchases - related parties increased $24 million in the first quarter of 2022
compared to the same period of 2021. This was primarily due to modifications to
lease contracts which resulted in costs now being recorded to purchases -
related parties as opposed to rental cost of sales - related parties, which is
included in cost of revenues as noted above. This increase, and other
miscellaneous increases, were partially offset by decreased employee-related
costs from MPC.

Depreciation and amortization decreased $17 million in the first quarter of 2022
compared to the same period of 2021. This was primarily due to the derecognition
of fixed assets due to the modification of certain lease contracts and
accelerated depreciation on refining logistics assets at MPC's idled Gallup
refinery.

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L&S Operating Data

                    [[Image Removed: mplx-20220331_g5.jpg]]

                                                  Three Months Ended March 31,
                                                        2022                     2021
L&S
Pipeline throughput (mbpd)
Crude oil pipelines                                 3,380                       3,282
Product pipelines                                   1,956                       1,858
Total pipelines                                     5,336                       5,140

Average tariff rates ($ per barrel)(1)
Crude oil pipelines                       $          0.93                      $ 0.96
Product pipelines                                    0.82                        0.79
Total pipelines                           $          0.89                      $ 0.90

Terminal throughput (mbpd)                          2,941                       2,613

Marine Assets (number in operation)(2)
Barges                                                296                         297
Towboats                                               23                          23


(1)   Average tariff rates calculated using pipeline transportation revenues
divided by pipeline throughput barrels.
(2)   Represents total at end of period.

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G&P Segment

First Quarter G&P Segment Financial Highlights (in millions)

[[Image Removed: mplx-20220331_g6.jpg]][[Image Removed: mplx-20220331_g7.jpg]]


                    [[Image Removed: mplx-20220331_g8.jpg]]

                                                                        Three Months Ended March 31,
(In millions)                                                2022                   2021                 Variance
Service revenue                                        $         486          $         508          $         (22)
Rental income                                                     81                     92                    (11)
Product related revenue                                          661                    397                    264
Income from equity method investments                             47                     34                     13
Other income/(loss)                                               (2)                    14                    (16)
Total segment revenues and other income                        1,273                  1,045                    228
Cost of revenues                                                 198                    200                     (2)
Purchased product costs                                          467                    276                    191
Purchases - related parties                                       80                     83                     (3)
Depreciation and amortization                                    183                    182                      1

General and administrative expenses                               35                     40                     (5)

Other taxes                                                       13                     13                      -
Segment income from operations                                   297                    251                     46
Depreciation and amortization                                    183                    182                      1

Income from equity method investments                            (47)                   (34)                   (13)
Distributions/adjustments related to equity method
investments                                                       74                     63                     11

Other                                                             (9)                     4                    (13)
Adjusted EBITDA attributable to noncontrolling
interests                                                         (9)                   (10)                     1
Segment Adjusted EBITDA(1)                                       489                    456                     33

Capital expenditures                                              95                     30                     65
Investments in unconsolidated affiliates               $          42          $          26          $          16

(1) See the Reconciliation of Adjusted EBITDA attributable to MPLX LP and DCF attributable to GP and LP unitholders from Net income table for the reconciliation to the most directly comparable GAAP measure.

Three months ended March 31, 2022 compared to three months ended March 31, 2021



Service revenue decreased $22 million in the first quarter of 2022 compared to
the same period of 2021. This was primarily due to lower fees from lower volumes
in the Rockies and Marcellus as well as a decrease in volumes due to the
Javelina divestiture in the Southwest of $34 million, partially offset by an
increase in fees due to a 2021 contract modification in the Marcellus resulting
in a change in the presentation of the related income from rental income to
service revenue.

Rental income decreased $11 million in the first quarter of 2022 compared to the
same period of 2021. This was primarily due to a 2021 contract modification in
the Marcellus resulting in a change in the presentation of the related income
from rental income to service revenue.
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Product related revenue increased $264 million in the first quarter of 2022
compared to the same period of 2021. This was primarily due to higher prices
across all regions of approximately $187 million and higher processed volumes in
the Southwest of $87 million. This was partially offset by a decrease in volumes
primarily due to the Javelina divestiture in the Southwest.

Income from equity method investments increased $13 million in the first quarter
of 2022 compared to the same period of 2021, primarily due to higher volumes and
rates associated with joint ventures in the Utica, Marcellus and Southwest
regions.

Other income/(loss) decreased $16 million in the first quarter of 2022 compared to the same period of 2021 primarily due to a loss on disposal of assets.



Purchased product costs increased $191 million in the first quarter of 2022
compared to the same period of 2021. This was primarily due to higher prices of
$143 million in the Southwest and Southern Appalachia and higher volumes in the
Southwest.



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G&P Operating Data
[[Image Removed: mplx-20220331_g9.jpg]][[Image Removed: mplx-20220331_g10.jpg]][[Image Removed: mplx-20220331_g11.jpg]]

                                                        Three Months Ended                                           Three Months Ended
                                                           March 31, 2022                                               March 31, 2021
                                            MPLX LP(1)                   MPLX LP Operated(2)             MPLX LP(1)                   MPLX LP Operated(2)
G&P
Gathering Throughput (MMcf/d)
Marcellus Operations                             1,314                            1,314                       1,298                            1,298
Utica Operations                                     -                            1,813                           -                            1,566
Southwest Operations                             1,307                            1,476                       1,373                            1,448
Bakken Operations                                  147                              147                         146                              146
Rockies Operations                                 394                              526                         470                              627
Total gathering throughput                       3,162                            5,276                       3,287                            5,085

Natural Gas Processed (MMcf/d)
Marcellus Operations                             4,015                            5,529                       4,249                            5,677
Utica Operations                                     -                              423                           -                              513
Southwest Operations(3)                          1,384                            1,541                       1,295                            1,367
Southern Appalachian Operations                    224                              224                         227                              227
Bakken Operations                                  143                              143                         145                              145
Rockies Operations                                 407                              407                         441                              441
Total natural gas processed                      6,173                            8,267                       6,357                            8,370

C2 + NGLs Fractionated (mbpd)
Marcellus Operations(4)                            468                              468                         489                              489
Utica Operations(4)                                  -                               23                           -                               28
Southwest Operations(3)                              -                                -                           8                                8
Southern Appalachian Operations                     10                               10                          11                               11
Bakken Operations                                   21                               21                          19                               19
Rockies Operations                                   4                                4                           4                                4
Total C2 + NGLs fractionated(5)                    503                              526                         531                              559



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                                               Three Months Ended March 31,
                                                     2022                     2021
Pricing Information
Natural Gas NYMEX HH ($ per MMBtu)     $          4.57                      $ 2.72
C2 + NGL Pricing ($ per gallon)(6)     $          1.15                      

$ 0.73




(1)   This column represents operating data for entities that have been
consolidated into the MPLX financial statements.
(2)   This column represents operating data for entities that have been
consolidated into the MPLX financial statements as well as operating data for
MPLX-operated equity method investments.
(3)   The Southwest Operations for the three months ended March 31, 2021 include
the Javelina complex, which was sold on February 12, 2021. The processing and
fractionated volumes calculated for the number of days MPLX owned these assets
during 2021 were 96 MMcf/d and 17 mbpd, respectively.
(4)  Entities within the Marcellus and Utica Operations jointly own the Hopedale
fractionation complex. Hopedale throughput is included in the Marcellus and
Utica Operations and represent each region's utilization of the complex.
(5)   Purity ethane makes up approximately 188 mbpd and 199 mbpd of total MPLX
Operated, fractionated products for the three months ended March 31, 2022 and
2021, respectively. Purity ethane makes up approximately 184 mbpd and 194 mbpd
of total MPLX LP consolidated, fractionated products for the three months ended
March 31, 2022 and 2021, respectively.
(6)  C2 + NGL pricing based on Mont Belvieu prices assuming an NGL barrel of
approximately 35 percent ethane, 35 percent propane, six percent Iso-Butane, 12
percent normal butane and 12 percent natural gasoline.

Seasonality



The volume of crude oil and refined products transported and stored utilizing
our assets is affected by the level of supply and demand for crude oil and
refined products in the markets served directly or indirectly by our assets. The
majority of effects of seasonality on the L&S segment's revenues will be
mitigated through the use of our fee-based transportation and storage services
agreements with MPC that include minimum volume commitments.

In our G&P segment, we experience minimal impacts from seasonal fluctuations
which impact the demand for natural gas and NGLs and the related commodity
prices caused by various factors including variations in weather patterns from
year to year. We are able to manage the seasonality impacts through the
execution of our marketing strategy and via our storage capabilities. Overall,
our exposure to the seasonality fluctuations is declining due to our growth in
fee-based business.

Liquidity and Capital Resources

Cash Flows



Our cash and cash equivalents were $42 million at March 31, 2022 and $13 million
at December 31, 2021. The change in cash, cash equivalents and restricted cash
was due to the factors discussed below. Net cash provided by (used in) operating
activities, investing activities and financing activities were as follows:

                                         Three Months Ended March 31,
(In millions)                                  2022                   2021
Net cash provided by (used in):
Operating activities              $        1,125                    $ 1,124
Investing activities                        (276)                       (90)
Financing activities                        (820)                    (1,025)
Total                             $           29                    $     9

Net cash provided by operating activities increased $1 million in the first three months of 2022 compared to the first three months of 2021. The increase in net income was offset by working capital requirements.



Net cash used in investing activities increased $186 million in the first three
months of 2022 compared to the first three months of 2021, primarily due to an
increase in capital spending and an increase in contributions to equity method
investments, which included the $60 million contribution to our Bakken Pipeline
joint venture to fund our share of a debt repayment by the joint venture. The
first quarter of 2021 also included proceeds from the sale of our Javelina
plant, which further reduced the use of cash in that period.

Financing activities were an $820 million use of cash in the first three months
of 2022 compared to a $1,025 million use of cash in the first three months of
2021. The primary reason for the decrease in the use of cash was due to net debt
borrowings of $57 million in the first quarter of 2022 compared to net debt
repayments of $110 million in the first quarter of 2021, as well as decreased
spending on the unit repurchase program of $55 million in the first quarter of
2022 compared to the first quarter of 2021.

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Free Cash Flow

The following table provides a reconciliation of FCF and free cash flow after distributions from net cash provided by operating activities for the three months ended March 31, 2022 and March 31, 2021.



                                                                  Three Months Ended March
                                                                             31,
(In millions)                                                           2022                      2021
Net cash provided by operating activities                        $         1,125             $      1,124

Adjustments to reconcile net cash provided by operating activities to free cash flow Net cash used in investing activities

                                       (276)                     (90)
Contributions from MPC                                                        10                        7

Distributions to noncontrolling interests                                     (9)                     (10)
Free cash flow                                                               850                    1,031

Distributions paid to common and preferred unitholders                      (758)                    (754)
Free cash flow after distributions                               $            92             $        277

Debt and Liquidity Overview



On March 14, 2022, MPLX issued $1.5 billion aggregate principal amount of 4.950
percent senior notes due March 2052 (the "2052 Senior Notes") in an underwritten
public offering. The 2052 Senior Notes were offered at a price to the public of
98.982 percent with interest payable semi-annually in arrears, commencing on
September 14, 2022. The net proceeds were used to repay amounts outstanding
under the MPC Intercompany Loan Agreement and the MPLX Credit Agreement.

As of March 31, 2022, we had $20.1 billion in aggregate principal amount of senior notes outstanding. The increase compared to year-end 2021 resulted from the issuance of the 2052 Senior Notes, as discussed above.

Our intention is to maintain an investment-grade credit profile. As of March 31, 2022, the credit ratings on our senior unsecured debt were at or above investment grade level as follows:



Rating Agency          Rating
Moody's                Baa2 (stable outlook)
Standard & Poor's      BBB (stable outlook)
Fitch                  BBB (stable outlook)



The ratings reflect the respective views of the rating agencies. Although it is
our intention to maintain a credit profile that supports an investment grade
rating, there is no assurance that these ratings will continue for any given
period of time. The ratings may be revised or withdrawn entirely by the rating
agencies if, in their respective judgments, circumstances so warrant.

The MPLX Credit Agreement contains certain representations and warranties,
affirmative and restrictive covenants and events of default that we consider to
be usual and customary for an agreement of this type. The financial covenant
requires MPLX to maintain a ratio of Consolidated Total Debt as of the end of
each fiscal quarter to Consolidated EBITDA (both as defined in the MPLX Credit
Agreement) for the prior four fiscal quarters of no greater than 5.0 to 1.0 (or
5.5 to 1.0 during the six-month period following certain acquisitions).
Consolidated EBITDA is subject to adjustments for certain acquisitions completed
and capital projects undertaken during the relevant period. Other covenants
restrict us and/or certain of our subsidiaries from incurring debt, creating
liens on assets and entering into transactions with affiliates. As of March 31,
2022, we were in compliance with the covenants, including the financial covenant
with a ratio of Consolidated Total Debt to Consolidated EBITDA of 3.64 to 1.0.

The agreements governing our debt obligations do not contain credit rating
triggers that would result in the acceleration of interest, principal or other
payments solely in the event that our credit ratings are downgraded. However,
any downgrades in the credit ratings of our senior unsecured debt ratings to
below investment grade ratings could, among other things, increase the
applicable interest rates and other fees payable under the MPLX Credit Agreement
and may limit our ability to obtain future financing, including refinancing
existing indebtedness.

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Our liquidity totaled $4.7 billion at March 31, 2022 consisting of:

                                                   March 31, 2022
                                                                              Available
(In millions)                Total Capacity      Outstanding Borrowings        Capacity
MPLX Credit Agreement(1)    $        3,500      $                     -      $    3,500

MPC Loan Agreement                   1,500                         (323)          1,177
Total liquidity             $        5,000      $                  (323)          4,677
Cash and cash equivalents                                                            42
Total liquidity                                                              $    4,719

(1) Outstanding borrowings include less than $1 million in letters of credit outstanding under this facility.



We expect our ongoing sources of liquidity to include cash generated from
operations and borrowings under the MPC Loan Agreement, the MPLX Credit
Agreement and access to capital markets. We believe that cash generated from
these sources will be sufficient to meet our short-term and long-term funding
requirements, including working capital requirements, capital expenditure
requirements, contractual obligations, and quarterly cash distributions. We may
also, from time to time, repurchase our senior notes or preferred units in the
open market, in tender offers, in privately negotiated transactions or otherwise
in such volumes, at market prices and upon such other terms as we deem
appropriate and execute unit repurchases under our unit repurchase program. MPC
manages our cash and cash equivalents on our behalf directly with third-party
institutions as part of the treasury services that it provides to us under our
omnibus agreement. From time to time, we may also consider utilizing other
sources of liquidity, including the formation of joint ventures or sales of
non-strategic assets.

Equity and Preferred Units Overview

Common units

The table below summarizes the changes in the number of units outstanding through March 31, 2022:



(In units)                                                     Common
Balance at December 31, 2021                              1,016,178,378
Unit-based compensation awards                                  148,951
Units redeemed in unit repurchase program                    (3,119,522)

Balance at March 31, 2022                                 1,013,207,807



Unit Repurchase Program

During the three months ended March 31, 2022, we repurchased approximately 3
million common units at an average cost per unit of $32.06 per unit and paid
$100 million of cash. As of March 31, 2022, we had repurchased a total of
approximately 28 million units at an average cost per unit of $27.76 per unit
for a total of $763 million under the unit repurchase program. We have $237
million remaining under our repurchase authorization.

Distributions



We intend to pay a minimum quarterly distribution to the holders of our common
units of $0.2625 per unit, or $1.05 per unit on an annualized basis, to the
extent we have sufficient cash from our operations after the establishment of
cash reserves and the payment of costs and expenses, including reimbursements of
expenses to our general partner. The amount of distributions paid under our
policy and the decision to make any distributions is determined by our general
partner, taking into consideration the terms of our partnership agreement. Such
minimum distribution would equate to $266 million per quarter, or $1,064 million
per year, based on the number of common units outstanding at March 31, 2022.

On April 26, 2022, MPLX declared a cash distribution for the first quarter of
2022, totaling $713 million, or $0.7050 per common unit. This distribution will
be paid on May 13, 2022 to common unitholders of record on May 6, 2022. Although
our partnership agreement requires that we distribute all of our available cash
each quarter, we do not otherwise have a legal obligation to distribute any
particular amount per common unit. This rate will also be received by Series A
preferred unitholders.

Series B preferred unitholders are entitled to receive a fixed distribution of
$68.75 per unit, per annum, payable semi-annually in arrears on February 15 and
August 15, or the first business day thereafter, up to and including February
15, 2023. After February 15, 2023, the holders of Series B preferred units are
entitled to receive cumulative, quarterly distributions payable in arrears on
the 15th day of February, May, August and November of each year, or the first
business day thereafter, based on a floating annual rate equal to the
three-month LIBOR plus 4.652 percent, in each case assuming a distribution is
declared by the board of directors. Accordingly, a cash distribution payment
totaling $21 million was paid to Series B unitholders on February 15, 2022.
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MPLX has the right to redeem some or all of the Series B preferred units, at any time, on or after February 15, 2023. MPLX will pay unitholders the Series B preferred unit redemption price of $1,000 per unit plus any accumulated and unpaid distributions up to the redemption date.



The allocation of total cash distributions is as follows for the three months
ended March 31, 2022 and 2021. MPLX's distributions are declared subsequent to
quarter end; therefore, the following table represents total cash distributions
applicable to the period in which the distributions were earned.
                                                                   Three Months Ended March 31,
(In millions, except per unit data)                                 2022                   2021
Distribution declared:
Limited partner units - public                               $           257          $        262
Limited partner units - MPC                                              456                   445

Total LP distribution declared                                           713                   707
Series A preferred units                                                  21                    20
Series B preferred units                                                  11                    11
Total distribution declared                                              745                   738

Quarterly cash distributions declared per limited partner
common unit                                                  $        0.7050          $     0.6875



Capital Expenditures

Our operations are capital intensive, requiring investments to expand, upgrade,
enhance or maintain existing operations and to meet environmental and
operational regulations. Our capital requirements consist of maintenance capital
expenditures and growth capital expenditures. Examples of maintenance capital
expenditures are those made to replace partially or fully depreciated assets, to
maintain the existing operating capacity of our assets and to extend their
useful lives, or other capital expenditures that are incurred in maintaining
existing system volumes and related cash flows. In contrast, growth capital
expenditures are those incurred for acquisitions or capital improvements that we
expect will increase our operating capacity for volumes gathered, processed,
transported or fractionated, decrease operating expenses within our facilities
or increase operating income over the long term. Examples of growth capital
expenditures include costs to develop or acquire additional pipeline, terminal,
processing or storage capacity. In general, growth capital includes costs that
are expected to generate additional or new cash flow for MPLX.

MPLX's initial capital investment plan for 2022 totaled $900 million which
includes growth capital of $700 million, maintenance capital of $140 million and
a $60 million investment in unconsolidated affiliates for the repayment of our
9.19 percent indirect share of the Bakken Pipeline joint venture's debt due in
2022. Growth capital expenditures and investments in affiliates during the three
months ended March 31, 2022 were primarily for gas gathering, processing and
de-ethanization projects in our Bakken, Marcellus, and Southwest basins and the
expansion of our crude gathering systems in the Permian and Bakken basins.
Spending for the quarter also included the $60 million contribution to our
Bakken Pipeline joint venture to fund our share of a debt repayment by the joint
venture. We continuously evaluate our capital plan and make changes as
conditions warrant.

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Our capital expenditures are shown in the table below:

                                                                            Three Months Ended March 31,
(In millions)                                                                2022                   2021
Capital expenditures:
Growth capital expenditures                                           $    

148 $ 71



Investments in unconsolidated affiliates                                          110                    35

Capitalized interest                                                               (2)                   (5)
Total growth capital expenditures                                                 256                   101
Maintenance capital expenditures                                                   24                    18
Maintenance capital reimbursements                                                (10)                   (7)

Total maintenance capital expenditures                                             14                    11

Total growth and maintenance capital expenditures                                 270                   112
Investments in unconsolidated affiliates(1)                                      (110)                  (35)

Growth and maintenance capital reimbursements(2)                                   10                     7
Decrease in capital accruals                                                       (3)                   37
Capitalized interest                                                                2                     5
Additions to property, plant and equipment, net(1)                    $     

169 $ 126




(1)  Investments in unconsolidated affiliates and additions to property, plant
and equipment, net are shown as separate lines within investing activities in
the Consolidated Statements of Cash Flows.
(2)  Growth and maintenance capital reimbursements are included in the
Contributions from MPC line within financing activities in the Consolidated
Statements of Cash Flows.

Contractual Cash Obligations



As of March 31, 2022, our contractual cash obligations included third-party and
related party debt, finance and operating lease obligations, purchase
obligations for services and to acquire property, plant and equipment, and other
liabilities. During the three months ended March 31, 2022, our third-party
long-term debt obligations increased by $1.2 billion, primarily due to the
issuance of the $1.5 billion aggregate principal amount of 4.950 percent 2052
Senior Notes, discussed above. A portion of the issuance was used to repay
amounts outstanding on the MPLX Credit Agreement. There were no other material
changes to our contractual obligations outside the ordinary course of business
since December 31, 2021.

Off-Balance Sheet Arrangements



Off-balance sheet arrangements comprise those arrangements that may potentially
impact our liquidity, capital resources and results of operations, even though
such arrangements are not recorded as liabilities under U.S. GAAP. Our
off-balance sheet arrangements are limited to indemnities and guarantees that
are described in Note 14. Although these arrangements serve a variety of our
business purposes, we are not dependent on them to maintain our liquidity and
capital resources, and we are not aware of any circumstances that are reasonably
likely to cause the off-balance sheet arrangements to have a material adverse
effect on our liquidity and capital resources.

Transactions with Related Parties

At March 31, 2022, MPC owned our non-economic general partnership interest and held approximately 64 percent of our outstanding common units.



We provide MPC with crude oil and product pipeline and trucking transportation
services based on regulated tariff/contracted rates, as well as storage,
terminal, fuels distribution, and inland marine transportation services based on
contracted rates. We also have agreements with MPC under which we receive fees
for operating MPC's retained pipeline assets, providing management services for
the marine business, and operating certain of MPC's equity method investments.
MPC provides us with certain services related to information technology,
engineering, legal, accounting, treasury, human resources and other
administrative services under employee services and omnibus services agreements.

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The below table shows the percentage of "Total revenues and other income" as
well as "Total costs and expenses" with MPC:

                                         Three Months Ended March 31,
                                                2022                  2021
Total revenues and other income                             48  %     51  %
Total costs and expenses                                    24  %     29  %



For further discussion of agreements and activity with MPC and related parties see Item 1. Business in our Annual Report on Form 10-K for the year ended December 31, 2021 and Note 4 of the Notes to the Consolidated Financial Statements in this report.

Environmental Matters and Compliance Costs



We have incurred and may continue to incur substantial capital, operating and
maintenance, and remediation expenditures as a result of environmental laws and
regulations. If these expenditures, as with all costs, are not ultimately
reflected in the prices of our products and services, our operating results will
be adversely affected. We believe that substantially all of our competitors must
comply with similar environmental laws and regulations. However, the specific
impact on each competitor may vary depending on a number of factors, including,
but not limited to, the age and location of its operating facilities.

During the three months ended March 31, 2022, environmental remediation costs
increased due to a release of crude oil on our pipeline near Edwardsville,
Illinois in March of 2022. There have been no additional changes to our
environmental matters and compliance costs since our Annual Report on Form 10-K
for the year ended December 31, 2021.

Critical Accounting Estimates



As of March 31, 2022, there have been no significant changes to our critical
accounting estimates since our Annual Report on Form 10-K for the year ended
December 31, 2021.

Accounting Standards Not Yet Adopted



While new financial accounting pronouncements will be effective for our
financial statements in the future, there are no standards that have not yet
been adopted that are expected to have a material impact on our financial
statements. Accounting standards are discussed in Note 2 of the Notes to the
Consolidated Financial Statements.

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