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, 2020.

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;
•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 that we cannot predict. 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:

•general economic, political or regulatory developments, including changes in
governmental policies relating to refined petroleum products, crude oil, natural
gas or NGLs, or taxation;
•the magnitude and duration 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 the business, financial
condition, results of operations and cash flows;
•adverse changes in laws including with respect to tax and regulatory matters;
•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;
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•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 reliability of processing units and other equipment;
•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;
•foreign imports and exports of crude oil, refined products, natural gas and
NGLs;
•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, 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, 2020. We undertake no obligation to update any forward-looking statements 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. We are engaged in the transportation, storage and
distribution of crude oil and refined petroleum products; the gathering,
processing and transportation of natural gas; and the gathering, transportation,
fractionation, storage and marketing of NGLs. Our operations are conducted in
our Logistics and Storage and Gathering and Processing segments.

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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, 2021
and March 31, 2020 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-20210331_g1.jpg]]
Other Highlights

•Announced a first quarter 2021 distribution rate of $0.6875 per common unit.
•During the first quarter of 2021, we returned $155 million to unitholders
through the repurchase of 6,272,981 public common units under our unit
repurchase program. As of March 31, 2021, total repurchases of $188 million have
been made under the unit repurchase program since the program was launched in
the fourth quarter of 2020.
•In line with previously announced efforts around portfolio optimization, the
company closed on the sale of our Javelina plant in Corpus Christi, Texas, on
February 12, 2021, for $70 million of cash in addition to future consideration
contingent on the performance of the facility.
•On January 15, 2021 we redeemed $750 million outstanding aggregate principal
amount of 5.250 percent senior notes due January 15, 2025, at 102.625 percent of
the principal amount.

CURRENT ECONOMIC ENVIRONMENT

During the first quarter of 2021, we have seen improvement in the environment in
which our business operates as COVID-19 impacts are beginning to subside. The
increased availability of vaccinations, coupled with an easing of COVID-19
restrictions in certain areas, has been followed by an increase in economic
activity, the opening of many businesses and schools and an increase in
in-person interaction and associated travel.

In the first quarter of 2020, the outbreak of COVID-19 and its development into
a pandemic resulted in significant economic disruption globally. Actions taken
by various governmental authorities, individuals and companies around the world
to prevent the spread of COVID-19 through social distancing restricted travel,
many business operations, public gatherings and the overall level of individual
movement and in-person interaction across the globe. This significantly reduced
global economic activity and resulted in a decline in the demand for products
for which we provide midstream services. Macroeconomic conditions and global
geopolitical events have also resulted in significant price volatility related
to those aforementioned products.

We took actions to respond to the impacts that these matters have had on our business including:



•Emphasizing strict capital discipline by focusing on investments that deliver
the most attractive returns
•Identifying areas where we can reduce operating expenses across the business
•Evaluating and high-grading our capital portfolio

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Many uncertainties remain with respect to COVID-19 and we are unable to predict
the ultimate economic impacts from COVID-19 and how quickly economies can fully
recover to pre-pandemic levels. We believe we have proactively addressed many of
the known impacts of COVID-19 to the extent possible and will strive to continue
to do so, but there can be no guarantee the measures will be fully effective.

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 excess/deficit cash flow. 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.

We define Adjusted EBITDA as net income adjusted for: (i) depreciation and
amortization; (ii) provision/(benefit) for income taxes; (iii) amortization of
deferred financing costs; (iv) (gain)/loss on extinguishment of debt; (v)
non-cash equity-based compensation; (vi) impairment expense; (vii) net interest
and other financial costs; (viii) income/(loss) from equity method investments;
(ix) distributions and adjustments related to equity method investments; (x)
unrealized derivative gains/(losses); (xi) acquisition costs; (xii)
noncontrolling interest; and (xiii) other adjustments as deemed necessary. We
also use DCF, which we define as Adjusted EBITDA adjusted for: (i) deferred
revenue impacts; (ii) net interest and other financial costs; (iii) net
maintenance capital expenditures; (iv) equity method investment capital
expenditures paid out; and (v) other adjustments as deemed necessary. We make a
distinction between realized and unrealized gains and losses on derivatives.
During the period when a derivative contract is outstanding, changes in the fair
value of the derivative are recorded as an unrealized gain or loss. When a
derivative contract matures or is settled, the previously recorded unrealized
gain or loss is reversed and the realized gain or loss of the contract is
recorded.

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

We believe that the presentation of Adjusted EBITDA, DCF, FCF and excess/deficit
cash flow 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
excess/deficit cash flow 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 excess/deficit cash flow to
their most directly comparable measure calculated and presented in accordance
with GAAP, see the Liquidity and Capital resources section.

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.

COMPARABILITY OF OUR FINANCIAL RESULTS

Our acquisitions and dispositions have impacted comparability of our financial results (see Note 3 of the Notes to Consolidated Financial Statements).


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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, 2021 and 2020, 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)                                                 2021                2020               Variance

Total revenues and other income(1)                       $     2,339          $      992          $     1,347
Costs and expenses:
Cost of revenues (excludes items below)                          273                 368                  (95)
Purchased product costs                                          276                 135                  141
Rental cost of sales                                              32                  35                   (3)
Rental cost of sales - related parties                            39                  46                   (7)
Purchases - related parties                                      298                 276                   22
Depreciation and amortization                                    329                 325                    4
Impairment expense                                                 -               2,165               (2,165)
General and administrative expenses                               86                  97                  (11)

Other taxes                                                       32                  31                    1
Total costs and expenses                                       1,365               3,478               (2,113)
Income/(loss) from operations                                    974              (2,486)               3,460
Related party interest and other financial costs                   -                   3                   (3)
Interest expense, net of amounts capitalized                     198                 211                  (13)
Other financial costs                                             27                  16                   11
Income/(loss) before income taxes                                749              (2,716)               3,465
Provision for income taxes                                         1                   -                    1
Net income/(loss)                                                748              (2,716)               3,464
Less: Net income attributable to noncontrolling
interests                                                          9                   8                    1

Net income/(loss) attributable to MPLX LP                        739              (2,724)               3,463

Adjusted EBITDA attributable to MPLX LP(2)                     1,352               1,294                   58

DCF attributable to GP and LP unitholders(2)             $     1,106

$ 1,047 $ 59

(1) The three months ended March 31, 2020 includes impairment expense of approximately $1.3 billion related to three equity method investments. (2) Non-GAAP measure. See reconciliation below to the most directly comparable GAAP measures.



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                                                                                    Three Months Ended March 31,
(In millions)                                                              2021                   2020               Variance

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

$       748               $   (2,716)         $     3,464
Provision for income taxes                                                    1                        -                    1
Amortization of deferred financing costs                                     17                       14                    3
Gain on extinguishment of debt                                              (12)                       -                  (12)
Net interest and other financial costs                                      220                      216                    4
Income/(loss) from operations                                               974                   (2,486)               3,460
Depreciation and amortization                                               329                      325                    4
Non-cash equity-based compensation                                            3                        5                   (2)
Impairment expense                                                            -                    2,165               (2,165)
(Income)/loss from equity method investments                                (70)                   1,184               (1,254)
Distributions/adjustments related to equity method investments              121                      124                   (3)
Unrealized derivative losses/(gains)(1)                                       3                      (15)                  18

Other                                                                         2                        1                    1
Adjusted EBITDA                                                           1,362                    1,303                   59
Adjusted EBITDA attributable to noncontrolling interests                    (10)                      (9)                  (1)

Adjusted EBITDA attributable to MPLX LP(2)                                1,352                    1,294                   58
Deferred revenue impacts                                                     22                       23                   (1)
Net interest and other financial costs                                     (220)                    (216)                  (4)
Maintenance capital expenditures                                            (18)                     (34)                  16
Maintenance capital expenditures reimbursements                               7                       14                   (7)
Equity method investment capital expenditures paid out                       (1)                      (7)                   6

Other                                                                        (5)                       4                   (9)

DCF                                                                       1,137                    1,078                   59
Preferred unit distributions                                                (31)                     (31)                   -
DCF attributable to GP and LP unitholders                           $     1,106               $    1,047          $        59


(1)   MPLX makes a distinction between realized and unrealized gains and losses
on derivatives. During the period when a derivative contract is outstanding,
changes in the fair value of the derivative are recorded as an unrealized gain
or loss. When a derivative contract matures or is settled, the previously
recorded unrealized gain or loss is reversed and the realized gain or loss of
the contract is recorded.
(2)   For the three months ended March 31, 2021, the L&S and G&P segments made
up $896 million and $456 million of Adjusted EBITDA attributable to MPLX LP,
respectively. For the three months ended March 31, 2020, the L&S and G&P
segments made up $872 million and $422 million of Adjusted EBITDA attributable
to MPLX LP, respectively.
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                                                                         Three Months Ended March 31,
(In millions)                                                    2021                2020               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

$     1,124          $    1,009          $       115
Changes in working capital items                                     34                 112                  (78)
All other, net                                                      (15)                (30)                  15
Non-cash equity-based compensation                                    3                   5                   (2)

Gain on extinguishment of debt                                      (12)                  -                  (12)
Net interest and other financial costs                              220                 216                    4
Current income taxes                                                  1                   -                    1

Unrealized derivative losses/(gains)(1)                               3                 (15)                  18

Other adjustments to equity method investment distributions           2                   5                   (3)
Other                                                                 2                   1                    1
Adjusted EBITDA                                                   1,362               1,303                   59
Adjusted EBITDA attributable to noncontrolling interests            (10)                 (9)                  (1)

Adjusted EBITDA attributable to MPLX LP(2)                        1,352               1,294                   58
Deferred revenue impacts                                             22                  23                   (1)
Net interest and other financial costs                             (220)               (216)                  (4)
Maintenance capital expenditures                                    (18)                (34)                  16
Maintenance capital expenditures reimbursements                       7                  14                   (7)
Equity method investment capital expenditures paid out               (1)                 (7)                   6

Other                                                                (5)                  4                   (9)

DCF                                                               1,137               1,078                   59
Preferred unit distributions                                        (31)                (31)                   -
DCF attributable to GP and LP unitholders                   $     1,106

$ 1,047 $ 59




(1)   MPLX makes a distinction between realized and unrealized gains and losses
on derivatives. During the period when a derivative contract is outstanding,
changes in the fair value of the derivative are recorded as an unrealized gain
or loss. When a derivative contract matures or is settled, the previously
recorded unrealized gain or loss is reversed and the realized gain or loss of
the contract is recorded.
(2)   For the three months ended March 31, 2021, the L&S and G&P segments made
up $896 million and $456 million of Adjusted EBITDA attributable to MPLX LP,
respectively. For the three months ended March 31, 2020, the L&S and G&P
segments made up $872 million and $422 million of Adjusted EBITDA attributable
to MPLX LP, respectively.

Three months ended March 31, 2021 compared to three months ended March 31, 2020



Total revenues and other income increased $1,347 million in the first quarter of
2021 compared to the same period of 2020. This increase was primarily due to
impairments recorded in the first quarter of 2020 of $1,264 million. Impairments
were recognized related to our ownership in MarkWest Utica EMG, our indirect
ownership in Ohio Gathering Company, L.L.C. through our investment in MarkWest
Utica EMG and our ownership in Uintah Basin Field Services, L.L.C. The remaining
$83 million increase is primarily due to higher product related revenue due to
higher prices in all G&P regions of approximately $192 million as well as from
increased pipeline tariff rates and increased revenue from terminal storage.
These increases were partially offset by lower fees from lower volumes in the
Southwest and Bakken of $46 million, which includes impacts related to severe
weather in the Southwest. There were also decreases due to the Wholesale
Exchange, lower marine transportation fees, decreased volume deficiency payments
and lower L&S terminal and pipeline volumes, including decreased throughputs on
certain of our equity method investments.

Cost of Revenues decreased $95 million in the first quarter of 2021 compared to
the same period of 2020. This was primarily due to lower repairs, maintenance
and operating costs and lower project-related spend, both as a result of cost
reduction initiatives. The Wholesale Exchange as well as other miscellaneous
expenses also contributed to the decrease.

Purchased product costs increased $141 million in the first quarter of 2021
compared to the same period of 2020. This was primarily due to an increase of
$18 million related to unrealized derivative gains in the prior year compared to
unrealized
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derivative losses in the current year and higher prices of $136 million in the
Southwest and Southern Appalachia, partially offset by lower volumes of $14
million in the Southwest.

Rental cost of sales - related parties decreased $7 million in the first quarter
of 2021 compared to the same period of 2020. This was primarily due to lower
operating costs as well as decreased project spend from overall cost reduction
initiatives.

Purchases - related parties increased $22 million in the first quarter of 2021
compared to the same period of 2020. This was primarily due to higher prices in
the Rockies and higher employee related costs.

Impairment expense decreased $2,165 million in the first quarter of 2021
compared to the same period of 2020. During the first quarter of 2020 we
recorded impairment expense for goodwill, intangible assets and property, plant
and equipment of $1,814 million, $177 million and $174 million, respectively.
The impairment of goodwill related to our Eastern G&P reporting unit while the
intangible asset and property, plant and equipment impairments relate to certain
assets in our Southwest region. The impairments were primarily driven by the
slowing of drilling activity, which reduced production growth forecasts from our
producer customers.

General and administrative expenses decreased $11 million in the first quarter
of 2021 compared to the same period of 2020. This was primarily due to decreased
employee costs from MPC as a result of cost reduction initiatives as well as
decreased other miscellaneous expenses.

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)
provision/(benefit) for income taxes; (iii) amortization of deferred financing
costs; (iv) (gain)/loss on extinguishment of debt; (v) non-cash equity-based
compensation; (vi) impairment expense; (vii) net interest and other financial
costs; (viii) income/(loss) from equity method investments; (ix) distributions
and adjustments related to equity method investments; (x) unrealized derivative
gains/(losses); (xi) acquisition costs; (xii) noncontrolling interests; and
(xiii) 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) 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, 2021 and 2020.


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L&S Segment

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

[[Image Removed: mplx-20210331_g2.jpg]][[Image Removed: mplx-20210331_g3.jpg]]


                    [[Image Removed: mplx-20210331_g4.jpg]]

                                                                        Three Months Ended March 31,
(In millions)                                                   2021                2020               Variance
Service revenue                                            $       953          $    1,004          $       (51)
Rental income                                                      249                 242                    7
Product related revenue                                              4                  19                  (15)
Income from equity method investments                               36                  50                  (14)
Other income                                                        52                  51                    1
Total segment revenues and other income                          1,294               1,366                  (72)
Cost of revenues                                                   144                 238                  (94)
Purchases - related parties                                        215                 199                   16
Depreciation and amortization                                      147                 138                    9
General and administrative expenses                                 46                  52                   (6)

Other taxes                                                         19                  16                    3
Segment income from operations                                     723                 723                    -
Depreciation and amortization                                      147                 138                    9
Income from equity method investments                              (36)                (50)                  14

Distributions/adjustments related to equity method investments

                                                         58                  57                    1

Non-cash equity-based compensation                                   2                   3                   (1)
Other                                                                2                   1                    1

Segment adjusted EBITDA(1)                                         896                 872                   24

Capital expenditures                                                59                 184                 (125)
Investments in unconsolidated affiliates                   $         9      

$ 54 $ (45)

(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, 2021 compared to three months ended March 31, 2020



Service revenue decreased $51 million in the first quarter of 2021 compared to
the same period of 2020. This was primarily due to a $26 million decrease in
marine transportation fees, an $11 million decrease in volume deficiency
payments, a $25 million decrease due to the Wholesale Exchange as well as other
immaterial decreases associated with terminal and pipeline volumes. These
decreases were partially offset by increased pipeline tariff rates and increased
fees associated with Mt. Airy.

Rental income increased $7 million in the first quarter of 2021 compared to the
same period of 2020. This was primarily due to increased terminal storage fees
as well as additional refining logistics fees associated with increased storage
capacity and annual fee escalations.

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Product related revenue decreased $15 million in the first quarter of 2021
compared to the same period of 2020. This was primarily due to the Wholesale
Exchange.

Income from equity method investments decreased $14 million in the first quarter
of 2021 compared to the same period of 2020. This was primarily due to decreased
throughput volumes on MarEn Bakken Company LLC, Explorer Pipeline Company,
Illinois Extension Pipeline Company L.L.C. and LOCAP LLC.

Cost of revenues decreased $94 million in the first quarter of 2021 compared to
the same period of 2020. This was primarily due to the Wholesale Exchange as
well as lower project-related spend as a result of cost reduction initiatives.

Purchases - related parties increased $16 million in the first quarter of 2021
compared to the same period of 2020. This was primarily due to higher employee
related costs.

Depreciation and amortization increased $9 million in the first quarter of 2021
compared to the same period of 2020. This was primarily due to accelerated
depreciation related to assets at an indefinitely idled MPC refinery, as well as
property, plant and equipment placed in service in the last nine months of 2020
and the first three months of 2021.

General and administrative expenses decreased $6 million in the first quarter of
2021 compared to the same period of 2020. This was primarily due to decreased
employee costs from MPC as a result of cost reduction initiatives.
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G&P Segment

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

[[Image Removed: mplx-20210331_g5.jpg]][[Image Removed: mplx-20210331_g6.jpg]]


                    [[Image Removed: mplx-20210331_g7.jpg]]
(1)   Includes impairment of equity method investments of $1,264 million for
2020.
(2)  Includes impairment of goodwill of $1,814 million, long-lived assets
including intangibles of $351 million and equity method investments of $1,264
million for 2020.

                                                                          Three Months Ended March 31,
(In millions)                                                    2021                 2020               Variance
Service revenue                                             $       508          $       536          $       (28)
Rental income                                                        92                   88                    4
Product related revenue                                             397                  222                  175
Income/(loss) from equity method investments(1)                      34               (1,234)               1,268
Other income                                                         14                   14                    -
Total segment revenues and other income/(loss)                    1,045                 (374)               1,419
Cost of revenues                                                    200                  211                  (11)
Purchased product costs                                             276                  135                  141
Purchases - related parties                                          83                   77                    6
Depreciation and amortization                                       182                  187                   (5)
Impairment expense                                                    -                2,165               (2,165)
General and administrative expenses                                  40                   45                   (5)

Other taxes                                                          13                   15                   (2)
Segment income/(loss) from operations                               251               (3,209)               3,460
Depreciation and amortization                                       182                  187                   (5)
Impairment expense                                                    -                2,165               (2,165)
(Income)/loss from equity method investments                        (34)               1,234               (1,268)

Distributions/adjustments related to equity method investments

                                                          63                   67                   (4)

Unrealized derivative losses/(gains)(2)                               3                  (15)                  18
Non-cash equity-based compensation                                    1                    2                   (1)

Adjusted EBITDA attributable to noncontrolling interests            (10)                  (9)                  (1)
Segment Adjusted EBITDA(3)                                          456                  422                   34

Capital expenditures                                                 30                  134                 (104)
Investments in unconsolidated affiliates                    $        26          $        37          $       (11)


(1)   Includes impairment of equity method investments of $1,264 million for
2020.
(2)  MPLX makes a distinction between realized and unrealized gains and losses
on derivatives. During the period when a derivative contract is outstanding,
changes in the fair value of the derivative are recorded as an unrealized gain
or loss. When a derivative contract matures or is settled, the previously
recorded unrealized gain or loss is reversed and the realized gain or loss of
the contract is recorded.
(3)   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.
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Three months ended March 31, 2021 compared to three months ended March 31, 2020



Service revenue decreased $28 million in the first quarter of 2021 compared to
the same period of 2020. This was primarily due to lower fees from lower volumes
in the Southwest and Bakken, which includes impacts related to severe weather in
the Southwest.

Product related revenue increased $175 million in the first quarter of 2021
compared to the same period of 2020. This was primarily due to higher prices in
all of the regions of approximately $192 million and a slight increase in volume
in the Rockies, partially offset by lower volumes in the Southwest of $18
million, which includes impacts related to severe weather in the Southwest.

Income from equity method investments increased $1,268 million in the first
quarter of 2021 compared to the same period of 2020. This increase was driven by
impairments recorded in the first quarter of 2020 of $1,264 million. Impairments
were recognized related to our ownership in MarkWest Utica EMG, our indirect
ownership in Ohio Gathering Company, L.L.C. through our investment in MarkWest
Utica EMG and our ownership in Uintah Basin Field Services, L.L.C. Also
contributing to the increase was higher volumes associated with our Sherwood
Midstream LLC and Ohio Condensate Company joint ventures.

Cost of revenues decreased $11 million in the first quarter of 2021 compared to
the same period of 2020. This decrease is attributable to lower repairs,
maintenance and operating costs in the Marcellus and Southwest as a result of
cost reduction initiatives, partially offset by higher prices in the Rockies.

Purchased product costs increased $141 million in the first quarter of 2021
compared to the same period of 2020. This was primarily due to an increase of
$18 million related to unrealized derivative gains in the prior year compared to
unrealized derivative losses in the current year and higher prices of $136
million in the Southwest and Southern Appalachia, partially offset by lower
volumes of $14 million in the Southwest.

Purchases - related parties increased $6 million in the first quarter of 2021
compared to the same period of 2020. This was primarily due to higher prices in
the Rockies partially offset by lower employee related costs.

Impairment expense decreased $2,165 million in the first quarter of 2021
compared to the same period of 2020. During the first quarter of 2020 we
recorded impairment expense for goodwill, intangible assets and property, plant
and equipment of $1,814 million, $177 million and $174 million, respectively.
The impairment of goodwill related to our Eastern G&P reporting unit while the
intangible asset and property, plant and equipment impairments relate to certain
assets in our Southwest region. The impairments were primarily driven by the
slowing of drilling activity, which reduced production growth forecasts from our
producer customers.

SEASONALITY

The volume of crude oil and refined products transported and stored utilizing
our assets is directly affected by the level of supply and demand for crude oil
and refined products in the markets served directly or indirectly by our assets.
Any 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 seasonality fluctuations is declining due to growth in our
fee-based business.

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OPERATING DATA

                    [[Image Removed: mplx-20210331_g8.jpg]]
                                                Three Months Ended
                                                     March 31,
                                                 2021              2020
L&S
Pipeline throughput (mbpd)
Crude oil pipelines                            3,282              3,210
Product pipelines                              1,858              1,905
Total pipelines                                5,140              5,115

Average tariff rates ($ per barrel)(1)
Crude oil pipelines                       $     0.96             $ 0.93
Product pipelines                               0.79               0.79
Total pipelines                           $     0.90             $ 0.88

Terminal throughput (mbpd)                     2,613              2,966

Marine Assets (number in operation)(2)
Barges                                           297                305
Towboats                                          23                 23


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                                                       Three Months Ended                                       Three Months Ended
                                                          March 31, 2021                                           March 31, 2020
                                            MPLX LP(3)                 MPLX LP Operated(4)           MPLX LP(3)                 MPLX LP Operated(4)
G&P
Gathering Throughput (MMcf/d)
Marcellus Operations                            1,298                          1,298                     1,420                          1,420
Utica Operations                                    -                          1,566                         -                          1,800
Southwest Operations                            1,373                          1,448                     1,557                          1,601
Bakken Operations                                 146                            146                       156                            156
Rockies Operations                                470                            627                       592                            775
Total gathering throughput                      3,287                          5,085                     3,725                          5,752

Natural Gas Processed (MMcf/d)
Marcellus Operations                            4,249                          5,677                     4,198                          5,522
Utica Operations                                    -                            513                         -                            648
Southwest Operations                            1,295                          1,367                     1,648                          1,679
Southern Appalachian Operations                   227                            227                       243                            243
Bakken Operations                                 145                            145                       156                            156
Rockies Operations                                441                            441                       539                            539
Total natural gas processed                     6,357                          8,370                     6,784                          8,787


C2 + NGLs Fractionated (mbpd)
Marcellus Operations(5)                           489                            489                       456                            456
Utica Operations(5)                                 -                             28                         -                             34
Southwest Operations                                8                              8                        15                             15
Southern Appalachian Operations(6)                 11                             11                        12                             12
Bakken Operations                                  19                             19                        31                             31
Rockies Operations                                  4                              4                         5                              5
Total C2 + NGLs fractionated(7)                   531                            559                       519                            553


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                                             Three Months Ended
                                                  March 31,
                                              2021              2020
Pricing Information
Natural Gas NYMEX HH ($ per MMBtu)     $     2.72             $ 1.87
C2 + NGL Pricing ($ per gallon)(8)     $     0.73             $ 0.40


(1)   Average tariff rates calculated using pipeline transportation revenues
divided by pipeline throughput barrels.
(2)   Represents total at end of period.
(3)   This column represents operating data for entities that have been
consolidated into the MPLX financial statements.
(4)   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.
(5)   Hopedale is jointly owned by Ohio Fractionation and MarkWest Utica EMG.
Ohio Fractionation is a subsidiary of MarkWest Liberty Midstream. MarkWest
Liberty Midstream and MarkWest Utica EMG are entities that operate in the
Marcellus and Utica regions, respectively. Marcellus Operations includes Ohio
Fractionation's portion utilized of the jointly owned Hopedale Fractionation
Complex. Utica Operations includes MarkWest Utica EMG's portion utilized of the
jointly owned Hopedale Fractionation Complex. Additionally, Sherwood Midstream
has the right to fractionation revenue and the obligation to pay expenses
related to 40 mbpd of capacity in the Hopedale 3 and Hopedale 4 fractionators.
(6)   Includes NGLs fractionated for the Marcellus Operations and Utica
Operations.
(7)   Purity ethane makes up approximately 199 mbpd and 190 mbpd of total MPLX
Operated, fractionated products for the three months ended March 31, 2021 and
2020, respectively. Purity ethane makes up approximately 194 mbpd and 183 mbpd
of total MPLX LP consolidated, fractionated products for the three months ended
March 31, 2021 and 2020, respectively.
(8)   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.

LIQUIDITY AND CAPITAL RESOURCES

Cash Flows



Our cash and cash equivalents were $24 million at March 31, 2021 and $15 million
at December 31, 2020. 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)                                  2021                   2020
Net cash provided by (used in):
Operating activities              $        1,124                    $ 1,009
Investing activities                         (90)                      (362)
Financing activities                      (1,025)                      (605)
Total                             $            9                    $    42



Net cash provided by operating activities increased $115 million in the first
three months of 2021 compared to the first three months of 2020, primarily due
net income adjusted for non-cash items.

Net cash used in investing activities decreased $272 million in the first three
months of 2021 compared to the first three months of 2020, primarily due to
decreased spending related to the capital budget and decreased contributions to
equity method investments.

Financing activities were a $1,025 million use of cash in the first three months
of 2021 compared to a $605 million use of cash in the first three months of
2020. The primary reason for the increase in the use of cash was due to the
return of capital to unitholders through the unit repurchase program as well as
net repayments on long-term debt in the current year compared to net borrowing
on long-term debt in the prior year.

Free Cash Flow



The following table provides a reconciliation of FCF and excess/deficit cash
flow from net cash provided by operating activities for the three months ended
March 31, 2021 and March 31, 2020.

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                                                                              Three Months Ended March 31,
(In millions)                                                                                                      2021                2020
Net cash provided by operating activities                                                                      $    1,124          $    1,009

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

                                                                                 (90)               (362)
Contributions from MPC                                                                                                  7                  14

Distributions to noncontrolling interests                                                                             (10)                 (9)
Free cash flow                                                                                                      1,031                 652

Distributions to common and preferred unitholders                                                                    (754)               (758)
Excess (deficit) cash flow                                                                                     $      277          $     (106)



Debt and Liquidity Overview

On January 15, 2021, MPLX redeemed $750 million outstanding aggregate principal
amount of 5.250 percent senior notes due January 15, 2025, at 102.625 percent of
the principal amount.

Our outstanding borrowings at March 31, 2021 and December 31, 2020 consist of
the following:
(In millions)                               March 31, 2021       December 31, 2020
MPLX LP:

Bank revolving credit facility             $           835      $              175

Floating rate senior notes                           1,000                   1,000

Fixed rate senior notes                             18,532                  19,240
Consolidated subsidiaries:
MarkWest                                                23                      23
ANDX                                                    45                      87

Financing lease obligations                             10                      11
Total                                               20,445                  20,536
Unamortized debt issuance costs                       (112)                   (116)
Unamortized discount/premium                          (279)                   (281)
Amounts due within one year                             (2)                   (764)

Total long-term debt due after one year $ 20,052 $ 19,375





Our intention is to maintain an investment grade credit profile. As of April 20,
2021, the credit ratings on our senior unsecured debt were at or above
investment grade level as follows:
Rating Agency          Rating
Moody's                Baa2 (negative outlook)
Standard & Poor's      BBB (negative 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,
2021, we were in
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compliance with the covenants, including the financial covenant with a ratio of
Consolidated Total Debt to Consolidated EBITDA of 3.8 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.

Our liquidity totaled $4.2 billion at March 31, 2021 consisting of:


                                                                         March 31, 2021
                                                                            Outstanding            Available
(In millions)                                     Total Capacity            Borrowings              Capacity

Bank revolving credit facility due 2024(1) $ 3,500 $


       (835)         $     2,665

MPC Loan Agreement                                        1,500                       -                1,500
Total liquidity                                  $        5,000          $         (835)               4,165
Cash and cash equivalents                                                                                 24
Total liquidity                                                                                  $     4,189

(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. 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, 2021:
(In units)
Balance at December 31, 2020                              1,038,777,978
Unit-based compensation awards                                  143,247
Units redeemed in Unit Repurchase Program                    (6,272,981)

Balance at March 31, 2021                                 1,032,648,244



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 $271 million per quarter, or $1,084 million
per year, based on the number of common units outstanding at March 31, 2021. On
April 27, 2021, we announced the board of directors of our general partner had
declared a distribution of $0.6875 per unit that will be paid on May 14, 2021 to
unitholders of record on May 7, 2021. This is consistent with the prior quarter
distribution. This rate will also be received by Series A preferred unitholders.
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.

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
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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 16, 2021.

The allocation of total quarterly cash distributions is as follows for the three
months ended March 31, 2021 and 2020. 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)                                    2021                   2020
Distribution declared:
Limited partner units - public                                  $           262          $       270
Limited partner units - MPC                                                 445                  458

Total LP distribution declared                                              707                  728
Series A preferred units                                                     20                   20
Series B preferred units                                                     11                   11
Total distribution declared                                                 738                  759

Cash distributions declared per limited partner common unit $ 0.6875 $ 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 capital improvements that we expect will
increase our operating capacity to increase 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 the acquisition of equipment or the construction costs
associated with new well connections, and the development of additional
pipeline, processing or storage capacity. In general, growth capital includes
costs that are expected to generate additional or new cash flow for MPLX.

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Our capital expenditures are shown in the table below:
                                                                              Three Months Ended March 31,
(In millions)                                                                   2021                   2020
Capital expenditures:
Growth capital expenditures                                              $            71          $       284
Growth capital reimbursements                                                          -                    -
Investments in unconsolidated affiliates                                              35                   91
Return of capital                                                                      -                  (69)

Capitalized interest                                                                  (5)                 (13)
Total growth capital expenditures                                                    101                  293
Maintenance capital expenditures                                                      18                   34
Maintenance capital reimbursements                                                    (7)                 (14)
Total maintenance capital expenditures                                                11                   20

Total growth and maintenance capital expenditures                                    112                  313
Investments in unconsolidated affiliates(1)                                          (35)                 (91)
Return of capital(1)                                                                   -                   69

Growth and maintenance capital reimbursements(2)                                       7                   14
Decrease in capital accruals                                                          37                   61
Capitalized interest                                                                   5                   13
Additions to property, plant and equipment, net(1)                       $  

126 $ 379

(1) Investments in unconsolidated affiliates, return of capital 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, 2021, our contractual cash obligations included long-term 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, 2021, our third-party long-term debt obligations
decreased by $90 million, primarily due to the redemption of $750 million
outstanding aggregate principal amount of 5.250 percent senior notes due January
15, 2025 discussed above, partially offset by increased borrowings on the MPLX
Credit Agreement. There were no other material changes to our contractual
obligations outside the ordinary course of business since December 31, 2020.

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 21. 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, 2021, MPC owned our non-economic general partnership interest and held approximately 63 percent of our outstanding common units.



Excluding revenues attributable to volumes shipped by MPC under joint tariffs
with third parties that are treated as third-party revenues for accounting
purposes and excluding losses for impairment of equity method investments, MPC
accounted for 51 percent and 55 percent of our total revenues and other income
for the first quarter of 2021 and 2020, respectively. We provide crude oil and
product pipeline transportation services based on regulated tariff rates and
storage services and inland marine transportation based on contracted rates.
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Of our total costs and expenses, excluding impairment expense, MPC accounted for
29 percent and 29 percent for the first quarter of 2021 and 2020, respectively.
MPC performed certain services for us related to information technology,
engineering, legal, accounting, treasury, human resources and other
administrative services.

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, 2020 and Note 5 of the Notes to 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.

As of March 31, 2021, there have been no significant changes to our environmental matters and compliance costs since our Annual Report on Form 10-K for the year ended December 31, 2020.

CRITICAL ACCOUNTING ESTIMATES



As of March 31, 2021, 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, 2020.

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 Consolidated Financial Statements.

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