UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_____________________________________________

FORM 10-Q

____________________________________________


(Mark One)
☒			QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, ~~2022~~2023


☐			TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number 001-35714

_____________________________________________

MPLX LP

(Exact name of registrant as specified in its charter)

_____________________________________________

Delaware

27-0005456

(State or other jurisdiction of
incorporation or organization)

(I.R.S. Employer
Identification No.)

200 E. Hardin Street,

Findlay,

Ohio

45840

(Address of principal executive offices)

(Zip code)

(419) 421-2414

(Registrant’s telephone number, including area code)

_____________________________________________


Securities Registered pursuant to Section 12(b) of the Act
Title of each class	Trading symbol(s)	Name of each exchange on which registered
Common Units Representing Limited Partnership Interests	MPLX	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x No ¨

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files.) Yes x No ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer

Accelerated filer

☐

Non-accelerated filer

☐

Smaller reporting company

☐

Emerging growth company

☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act) Yes ☐ No x

MPLX LP had ~~1,012,204,900~~1,001,216,867 common units outstanding atas of July ~~29, 2022.~~26, 2023.

Table of Contents


		Page
PART I – FINANCIAL INFORMATION
Item 1.	Financial Statements:
	Consolidated Statements of Income (Unaudited)	3
	Consolidated Statements of Comprehensive Income (Unaudited)	4
	Consolidated Balance Sheets (Unaudited)	5
	Consolidated Statements of Cash Flows (Unaudited)	6
	Consolidated Statements of Equity and Series A Preferred Units (Unaudited)	7
	Notes to Consolidated Financial Statements (Unaudited)	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	2623
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	4643
Item 4.	Controls and Procedures	4644

PART II – OTHER INFORMATION
Item 1.	Legal Proceedings	4845
Item 1A.	~~Item 1A.~~ Risk Factors	48
~~Item 2. Unregistered Sales of Equity Securities and Use of Proceeds~~	4845

Item 5.	Other Information	45
Item 6.	Exhibits	4946
	Signatures	5147

Unless otherwise stated or the context otherwise ~~requires,~~indicates, all references in this ~~report~~Form 10-Q to “MPLX LP,” “MPLX,” “the Partnership,” “we,” “our,” “us,” or like terms refer to MPLX LP and its consolidated subsidiaries. ~~Additionally, throughout this Quarterly Report on Form 10-Q, we have used terms in~~References to our ~~discussion of~~sponsor and customer, “MPC,” refer collectively to Marathon Petroleum Corporation and its subsidiaries, other than the ~~business and operating results that have been defined in our Glossary of Terms.~~

Partnership.

Table of Contents

Glossary of Terms

The abbreviations, acronyms and industry technology used in this report are defined as ~~follows.~~follows:



ASC			Accounting Standards Codification
ASU			Accounting Standards Update

Barrel			One stock tank barrel, or 42 U.S. gallons of liquid volume, used in reference to crude oil or other liquid hydrocarbons


Btu			One British thermal unit, an energy measurement

DCF (a non-GAAP financial measure)			Distributable Cash Flow

EBITDA (a non-GAAP financial measure)			Earnings Before Interest, Taxes, Depreciation and Amortization


FASB			Financial Accounting Standards Board
FCF (a non-GAAP financial measure)			Free Cash Flow
GAAP			Accounting principles generally accepted in the United States of America




G&P			Gathering and Processing segment
~~LIBOR~~			~~London Interbank Offered Rate~~
L&S			Logistics and Storage segment
mbpd			Thousand barrels per day

MMBtu			One million British thermal units, an energy measurement
MMcf/d			One million cubic feet of natural gas per day
NGL			Natural gas liquids, such as ethane, propane, butanes and natural gasoline





SEC			U.S. Securities and Exchange Commission
SOFR			Secured Overnight Financing Rate

VIE			Variable interest entity

Table of Contents

Part I—Financial Information

Item 1. Financial Statements

MPLX LP

Consolidated Statements of Income (Unaudited)


		Three Months Ended June 30,				Six Months Ended June 30,					Three Months Ended June 30,				Six Months Ended June 30,
(In millions, except per unit data)	(In millions, except per unit data)	2022		2021		2022		2021		(In millions, except per unit data)	2023		2022		2023		2022
Revenues and other income:	Revenues and other income:									Revenues and other income:
Service revenue	Service revenue	$	577	$	578	$	1,131	$	1,167	Service revenue	$	635	$	577	$	1,240	$	1,131
Service revenue - related parties	Service revenue - related parties	938		907		1,853		1,779		Service revenue - related parties	971		938		1,924		1,853
Service revenue - product related	Service revenue - product related	118		76		241		153		Service revenue - product related	60		118		139		241
Rental income	Rental income	102		99		193		198		Rental income	59		102		120		193
Rental income - related parties	Rental income - related parties	198		168		363		410		Rental income - related parties	203		198		405		363
Product sales	Product sales	698		304		1,195		586		Product sales	376		698		796		1,195
Product sales - related parties	Product sales - related parties	51		31		96		73		Product sales - related parties	34		51		104		96

Sales-type lease revenue										Sales-type lease revenue	33		—		67		—
Sales-type lease revenue - related parties	Sales-type lease revenue - related parties	114		136		225		173		Sales-type lease revenue - related parties	125		114		250		225
Income from equity method investments	Income from equity method investments	111		66		210		136		Income from equity method investments	145		111		279		210
Other income (loss)	Other income (loss)	6		3		(11)		4		Other income (loss)	18		6		21		(11)
Other income - related parties	Other income - related parties	27		27		54		55		Other income - related parties	31		27		58		54
Total revenues and other income	Total revenues and other income	2,940		2,395		5,550		4,734		Total revenues and other income	2,690		2,940		5,403		5,550
Costs and expenses:	Costs and expenses:									Costs and expenses:
Cost of revenues (excludes items below)	Cost of revenues (excludes items below)	323		293		610		566		Cost of revenues (excludes items below)	348		323		656		610
Purchased product costs	Purchased product costs	663		338		1,130		614		Purchased product costs	354		663		760		1,130
Rental cost of sales	Rental cost of sales	42		32		79		64		Rental cost of sales	20		42		40		79
Rental cost of sales - related parties	Rental cost of sales - related parties	19		23		34		62		Rental cost of sales - related parties	9		19		16		34
Purchases - related parties	Purchases - related parties	351		297		670		595		Purchases - related parties	357		351		718		670
Depreciation and amortization	Depreciation and amortization	310		318		623		647		Depreciation and amortization	310		310		606		623
Impairment expense		—		42		—		42

General and administrative expenses	General and administrative expenses	82		87		160		173		General and administrative expenses	89		82		178		160

Other taxes	Other taxes	33		34		67		66		Other taxes	28		33		58		67
Total costs and expenses	Total costs and expenses	1,823		1,464		3,373		2,829		Total costs and expenses	1,515		1,823		3,032		3,373
Income from operations	Income from operations	1,117		931		2,177		1,905		Income from operations	1,175		1,117		2,371		2,177
Related party interest and other financial costs		1		2		5		2
Interest expense (net of amounts capitalized of $3 million, $5 million, $5 million and $10 million respectively)		212		195		410		393
Related-party interest and other financial costs										Related-party interest and other financial costs	—		1		—		5
Interest expense, net of amounts capitalized										Interest expense, net of amounts capitalized	226		212		450		410
Other financial costs	Other financial costs	20		19		40		46		Other financial costs	7		20		26		40
Income before income taxes	Income before income taxes	884		715		1,722		1,464		Income before income taxes	942		884		1,895		1,722
Provision for income taxes	Provision for income taxes	—		—		5		1		Provision for income taxes	—		—		1		5
Net income	Net income	884		715		1,717		1,463		Net income	942		884		1,894		1,717
Less: Net income attributable to noncontrolling interests	Less: Net income attributable to noncontrolling interests	9		9		17		18		Less: Net income attributable to noncontrolling interests	9		9		18		17

Net income attributable to MPLX LP	Net income attributable to MPLX LP	875		706		1,700		1,445		Net income attributable to MPLX LP	933		875		1,876		1,700
Less: Series A preferred unitholders interest in net income	Less: Series A preferred unitholders interest in net income	21		21		42		41		Less: Series A preferred unitholders interest in net income	23		21		46		42
Less: Series B preferred unitholders interest in net income	Less: Series B preferred unitholders interest in net income	10		10		21		21		Less: Series B preferred unitholders interest in net income	—		10		5		21

Limited partners’ interest in net income attributable to MPLX LP		$	844	$	675	$	1,637	$	1,383
Limited partners' interest in net income attributable to MPLX LP										Limited partners' interest in net income attributable to MPLX LP	$	910	$	844	$	1,825	$	1,637
Per Unit Data (See Note 6)	Per Unit Data (See Note 6)									Per Unit Data (See Note 6)
Net income attributable to MPLX LP per limited partner unit:	Net income attributable to MPLX LP per limited partner unit:									Net income attributable to MPLX LP per limited partner unit:
Common - basic	Common - basic	$	0.83	$	0.66	$	1.61	$	1.34	Common - basic	$	0.91	$	0.83	$	1.81	$	1.61
Common - diluted	Common - diluted	$	0.83	$	0.66	$	1.61	$	1.34	Common - diluted	$	0.91	$	0.83	$	1.81	$	1.61
Weighted average limited partner units outstanding:	Weighted average limited partner units outstanding:									Weighted average limited partner units outstanding:
Common - basic	Common - basic	1,012		1,029		1,013		1,033		Common - basic	1,001		1,012		1,001		1,013
Common - diluted	Common - diluted	1,012		1,029		1,014		1,033		Common - diluted	1,001		1,012		1,001		1,014

The accompanying notes are an integral part of these consolidated financial statements.

Table of Contents

MPLX LP

Consolidated Statements of Comprehensive Income (Unaudited)


		Three Months Ended June 30,				Six Months Ended June 30,					Three Months Ended June 30,				Six Months Ended June 30,
(In millions)	(In millions)	2022		2021		2022		2021		(In millions)	2023		2022		2023		2022
Net income	Net income	$	884	$	715	$	1,717	$	1,463	Net income	$	942	$	884	$	1,894	$	1,717
Other comprehensive income, net of tax:	Other comprehensive income, net of tax:									Other comprehensive income, net of tax:
Remeasurements of pension and other postretirement benefits related to equity method investments, net of tax	Remeasurements of pension and other postretirement benefits related to equity method investments, net of tax	—		—		9		(2)		Remeasurements of pension and other postretirement benefits related to equity method investments, net of tax	—		—		4		9
Comprehensive income	Comprehensive income	884		715		1,726		1,461		Comprehensive income	942		884		1,898		1,726
Less comprehensive income attributable to:	Less comprehensive income attributable to:									Less comprehensive income attributable to:
Noncontrolling interests	Noncontrolling interests	9		9		17		18		Noncontrolling interests	9		9		18		17

Comprehensive income attributable to MPLX LP	Comprehensive income attributable to MPLX LP	$	875	$	706	$	1,709	$	1,443	Comprehensive income attributable to MPLX LP	$	933	$	875	$	1,880	$	1,709

The accompanying notes are an integral part of these consolidated financial statements.

Table of Contents

MPLX LP

Consolidated Balance Sheets (Unaudited)


(In millions)	(In millions)	June 30, 2022		December 31, 2021		(In millions)	June 30, 2023		December 31, 2022
Assets	Assets					Assets
Current assets:

Cash and cash equivalents	Cash and cash equivalents	$	298	$	13	Cash and cash equivalents	$	755	$	238

Receivables, net	Receivables, net	789		654		Receivables, net	717		737
Current assets - related parties	Current assets - related parties	731		644		Current assets - related parties	654		729
Inventories	Inventories	157		142		Inventories	146		148

Other current assets	Other current assets	43		54		Other current assets	49		53
Total current assets	Total current assets	2,018		1,507		Total current assets	2,321		1,905
Equity method investments	Equity method investments	4,099		3,981		Equity method investments	4,124		4,095
Property, plant and equipment, net	Property, plant and equipment, net	19,767		20,042		Property, plant and equipment, net	18,692		18,848
Intangibles, net	Intangibles, net	768		831		Intangibles, net	641		705
Goodwill	Goodwill	7,645		7,657		Goodwill	7,645		7,645
Right of use assets, net	Right of use assets, net	300		268		Right of use assets, net	281		283
Noncurrent assets - related parties	Noncurrent assets - related parties	1,142		1,161		Noncurrent assets - related parties	1,199		1,225
Other noncurrent assets	Other noncurrent assets	49		60		Other noncurrent assets	970		959
Total assets	Total assets	35,788		35,507		Total assets	35,873		35,665

Liabilities	Liabilities					Liabilities
Current liabilities:

Accounts payable	Accounts payable	352		172		Accounts payable	128		224
Accrued liabilities	Accrued liabilities	415		363		Accrued liabilities	241		269

Current liabilities - related parties	Current liabilities - related parties	403		1,780		Current liabilities - related parties	336		343
Accrued property, plant and equipment	Accrued property, plant and equipment	104		97		Accrued property, plant and equipment	149		128

Long-term debt due within one year	Long-term debt due within one year	1,000		499		Long-term debt due within one year	1		988
Accrued interest payable	Accrued interest payable	224		202		Accrued interest payable	247		237
Operating lease liabilities	Operating lease liabilities	45		59		Operating lease liabilities	49		46

Other current liabilities	Other current liabilities	198		176		Other current liabilities	165		166
Total current liabilities	Total current liabilities	2,741		3,348		Total current liabilities	1,316		2,401
Long-term deferred revenue	Long-term deferred revenue	429		383		Long-term deferred revenue	268		219
Long-term liabilities - related parties	Long-term liabilities - related parties	303		302		Long-term liabilities - related parties	341		338
Long-term debt	Long-term debt	18,775		18,072		Long-term debt	20,405		18,808
Deferred income taxes	Deferred income taxes	14		10		Deferred income taxes	13		13
Long-term operating lease liabilities	Long-term operating lease liabilities	250		205		Long-term operating lease liabilities	228		230
Other long-term liabilities	Other long-term liabilities	167		170		Other long-term liabilities	113		142
Total liabilities	Total liabilities	22,679		22,490		Total liabilities	22,684		22,151
Commitments and contingencies (see Note 15)		0		0
Commitments and contingencies (see Note 14)						Commitments and contingencies (see Note 14)
Series A preferred units (30 million and 30 million units issued and outstanding)	Series A preferred units (30 million and 30 million units issued and outstanding)	965		965		Series A preferred units (30 million and 30 million units issued and outstanding)	968		968

Equity	Equity					Equity
Common unitholders - public (365 million and 369 million units issued and outstanding)		8,518		8,579
Common unitholders - public (354 million and 354 million units issued and outstanding)						Common unitholders - public (354 million and 354 million units issued and outstanding)	8,508		8,413

Common unitholders - MPC (647 million and 647 million units issued and outstanding)	Common unitholders - MPC (647 million and 647 million units issued and outstanding)	2,784		2,638		Common unitholders - MPC (647 million and 647 million units issued and outstanding)	3,480		3,293

Series B preferred units (0.6 million and 0.6 million units issued and outstanding)		611		611
Series B preferred units (0 and 0.6 million units issued and outstanding)						Series B preferred units (0 and 0.6 million units issued and outstanding)	—		611

Accumulated other comprehensive loss	Accumulated other comprehensive loss	(8)		(17)		Accumulated other comprehensive loss	(4)		(8)
Total MPLX LP partners’ capital	Total MPLX LP partners’ capital	11,905		11,811		Total MPLX LP partners’ capital	11,984		12,309
Noncontrolling interests	Noncontrolling interests	239		241		Noncontrolling interests	237		237
Total equity	Total equity	12,144		12,052		Total equity	12,221		12,546
Total liabilities, preferred units and equity	Total liabilities, preferred units and equity	$	35,788	$	35,507	Total liabilities, preferred units and equity	$	35,873	$	35,665

The accompanying notes are an integral part of these consolidated financial statements.

Table of Contents

MPLX LP

Consolidated Statements of Cash Flows (Unaudited)


		Six Months Ended June 30,					Six Months Ended June 30,
(In millions)	(In millions)	2022		2021		(In millions)	2023		2022
Operating activities:	Operating activities:					Operating activities:
Net income	Net income	$	1,717	$	1,463	Net income	$	1,894	$	1,717
Adjustments to reconcile net income to net cash provided by operating activities:	Adjustments to reconcile net income to net cash provided by operating activities:					Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred financing costs	Amortization of deferred financing costs	36		35		Amortization of deferred financing costs	29		36
Depreciation and amortization	Depreciation and amortization	623		647		Depreciation and amortization	606		623
Impairment expense		—		42

Deferred income taxes	Deferred income taxes	4		(1)		Deferred income taxes	(1)		4

Loss on disposal of assets		16		1

(Gain)/loss on disposal of assets						(Gain)/loss on disposal of assets	(13)		16
Income from equity method investments	Income from equity method investments	(210)		(136)		Income from equity method investments	(279)		(210)
Distributions from unconsolidated affiliates	Distributions from unconsolidated affiliates	258		239		Distributions from unconsolidated affiliates	331		258
Change in fair value of derivatives	Change in fair value of derivatives	(16)		39		Change in fair value of derivatives	(18)		(16)
Changes in:	Changes in:					Changes in:
Current receivables		(131)		(83)
Receivables						Receivables	54		(131)
Inventories	Inventories	(15)		(8)		Inventories	(7)		(15)
Current accounts payable and accrued liabilities		253		77
Current assets/current liabilities - related parties		—		101
Accounts payable and accrued liabilities						Accounts payable and accrued liabilities	(95)		253
Assets/liabilities - related parties						Assets/liabilities - related parties	123		—

Right of use assets/operating lease liabilities	Right of use assets/operating lease liabilities	—		1		Right of use assets/operating lease liabilities	2		—
Deferred revenue	Deferred revenue	41		43		Deferred revenue	35		41
All other, net	All other, net	36		29		All other, net	3		36
Net cash provided by operating activities	Net cash provided by operating activities	2,612		2,489		Net cash provided by operating activities	2,664		2,612
Investing activities:	Investing activities:					Investing activities:
Additions to property, plant and equipment	Additions to property, plant and equipment	(294)		(235)		Additions to property, plant and equipment	(432)		(294)
Acquisitions, net of cash acquired	Acquisitions, net of cash acquired	(28)		—		Acquisitions, net of cash acquired	—		(28)
Disposal of assets	Disposal of assets	67		74		Disposal of assets	18		67

Investments in unconsolidated affiliates	Investments in unconsolidated affiliates	(156)		(84)		Investments in unconsolidated affiliates	(77)		(156)

Net cash used in investing activities	Net cash used in investing activities	(411)		(245)		Net cash used in investing activities	(491)		(411)
Financing activities:	Financing activities:					Financing activities:
Long-term debt - borrowings		2,385		2,800
- repayments		(1,201)		(3,746)
Related party debt - borrowings		2,824		4,435
- repayments		(4,274)		(3,942)
Long-term debt borrowings						Long-term debt borrowings	1,589		2,385
Long-term debt repayments						Long-term debt repayments	(1,001)		(1,201)
Related party debt borrowings						Related party debt borrowings	—		2,824
Related party debt repayments						Related party debt repayments	—		(4,274)
Debt issuance costs	Debt issuance costs	(16)		—		Debt issuance costs	(15)		(16)

Unit repurchases	Unit repurchases	(135)		(310)		Unit repurchases	—		(135)
Redemption of Series B preferred units						Redemption of Series B preferred units	(600)		—

Distributions to noncontrolling interests	Distributions to noncontrolling interests	(19)		(20)		Distributions to noncontrolling interests	(19)		(19)
Distributions to Series A preferred unitholders	Distributions to Series A preferred unitholders	(42)		(41)		Distributions to Series A preferred unitholders	(46)		(42)
Distributions to Series B preferred unitholders	Distributions to Series B preferred unitholders	(21)		(21)		Distributions to Series B preferred unitholders	(21)		(21)
Distributions to unitholders and general partner	Distributions to unitholders and general partner	(1,430)		(1,421)		Distributions to unitholders and general partner	(1,553)		(1,430)

Contributions from MPC	Contributions from MPC	17		17		Contributions from MPC	13		17

All other, net	All other, net	(4)		(2)		All other, net	(3)		(4)
Net cash used in financing activities	Net cash used in financing activities	(1,916)		(2,251)		Net cash used in financing activities	(1,656)		(1,916)
Net increase/ (decrease) in cash, cash equivalents and restricted cash		285		(7)
Net change in cash, cash equivalents and restricted cash						Net change in cash, cash equivalents and restricted cash	517		285
Cash, cash equivalents and restricted cash at beginning of period	Cash, cash equivalents and restricted cash at beginning of period	13		15		Cash, cash equivalents and restricted cash at beginning of period	238		13
Cash, cash equivalents and restricted cash at end of period	Cash, cash equivalents and restricted cash at end of period	$	298	$	8	Cash, cash equivalents and restricted cash at end of period	$	755	$	298

The accompanying notes are an integral part of these consolidated financial statements.

Table of Contents

MPLX LP

Consolidated Statements of Equity and Series A Preferred Units (Unaudited)


		Partnership															Partnership
(In millions)	(In millions)	Common Unit-holders Public		Common Unit-holder MPC		Series B Preferred Unit-holders		Accumulated Other Comprehensive Loss		Non-controlling Interests		Total		Series A Preferred Unit-holders		(In millions)	Common Unit-holders Public		Common Unit-holder MPC		Series B Preferred Unit-holders		Accumulated Other Comprehensive Loss		Non-controlling Interests		Total		Series A Preferred Unit-holders
Balance at December 31, 2022																Balance at December 31, 2022	$	8,413	$	3,293	$	611	$	(8)	$	237	$	12,546	$	968

Net income																Net income	323		592		5		—		9		929		23

Redemption of Series B preferred units																Redemption of Series B preferred units	(2)		(3)		(595)		—		—		(600)		—
Distributions																Distributions	(275)		(502)		(21)		—		(10)		(808)		(23)
Contributions																Contributions	—		8		—		—		—		8		—

Other																Other	—		—		—		4		1		5		—

Balance at December 31, 2020		$	9,384	$	2,792	$	611	$	(15)	$	245	$	13,017	$	968
Net income		266		443		11		—		9		729		20
Unit repurchases		(155)		—		—		—		—		(155)		—
Distributions		(269)		(445)		(21)		—		(10)		(745)		(20)
Contributions		—		7		—		—		—		7		—
Other		—		(1)		—		(2)		—		(3)		—
Balance at March 31, 2021		9,226		2,796		601		(17)		244		12,850		968
Balance at March 31, 2023																Balance at March 31, 2023	$	8,459	$	3,388	$	—	$	(4)	$	237	$	12,080	$	968

Net income	Net income	251		423		10		—		9		693		21		Net income	322		588		—		—		9		919		23
Unit repurchases	Unit repurchases	(155)		—		—		—		—		(155)		—		Unit repurchases	—		—		—		—		—		—		—

Distributions	Distributions	(262)		(445)		—		—		(10)		(717)		(21)		Distributions	(274)		(502)		—		—		(9)		(785)		(23)
Contributions	Contributions	—		122		—		—		—		122		—		Contributions	—		5		—		—		—		5		—

Other	Other	1		1		—		—		—		2		—		Other	1		1		—		—		—		2		—

Balance at June 30, 2021		$	9,061	$	2,897	$	611	$	(17)	$	243	$	12,795	$	968

Balance at June 30, 2023																Balance at June 30, 2023	$	8,508	$	3,480	$	—	$	(4)	$	237	$	12,221	$	968

Balance at December 31, 2021	Balance at December 31, 2021	$	8,579	$	2,638	$	611	$	(17)	$	241	$	12,052	$	965	Balance at December 31, 2021	$	8,579	$	2,638	$	611	$	(17)	$	241	$	12,052	$	965

Net income	Net income	287		506		11		—		8		812		21		Net income	287		506		11		—		8		812		21
Unit repurchases	Unit repurchases	(100)		—		—		—		—		(100)		—		Unit repurchases	(100)		—		—		—		—		(100)		—

Distributions	Distributions	(260)		(456)		(21)		—		(9)		(746)		(21)		Distributions	(260)		(456)		(21)		—		(9)		(746)		(21)
Contributions	Contributions	—		10		—		—		—		10		—		Contributions	—		10		—		—		—		10		—

Other	Other	(1)		—		—		9		—		8		—		Other	(1)		—		—		9		—		8		—

Balance at March 31, 2022	Balance at March 31, 2022	8,505		2,698		601		(8)		240		12,036		965		Balance at March 31, 2022	$	8,505	$	2,698	$	601	$	(8)	$	240	$	12,036	$	965

Net income	Net income	304		540		10		—		9		863		21		Net income	304		540		10		—		9		863		21
Unit repurchases	Unit repurchases	(35)		—		—		—		—		(35)		—		Unit repurchases	(35)		—		—		—		—		(35)		—

Distributions	Distributions	(257)		(457)		—		—		(10)		(724)		(21)		Distributions	(257)		(457)		—		—		(10)		(724)		(21)
Contributions	Contributions	—		2		—		—		—		2		—		Contributions	—		2		—		—		—		2		—

Other	Other	1		1		—		—		—		2		—		Other	1		1		—		—		—		2		—

Balance at June 30, 2022	Balance at June 30, 2022	$	8,518	$	2,784	$	611	$	(8)	$	239	$	12,144	$	965	Balance at June 30, 2022	8,518		2,784		611		(8)		239		12,144		965

The accompanying notes are an integral part of these consolidated financial statements.

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Notes to Consolidated Financial Statements (Unaudited)

1. Description of the Business and Basis of Presentation

Description of the Business

MPLX LP is a diversified, large-cap master limited partnership formed by Marathon Petroleum Corporation that owns and operates midstream energy infrastructure and logistics assets, and provides fuels distribution services. References in this report to “MPLX LP,” “MPLX,” “the Partnership,” “we,” “ours,” “us,” or like terms refer to MPLX LP and its subsidiaries. References to “MPC” refer collectively to Marathon Petroleum Corporation as our sponsor and its subsidiaries, other than the Partnership. We are engaged in the gathering, transportation, storage and distribution of crude oil, refined products, ~~and~~ other hydrocarbon-based ~~products;~~products and renewables; the gathering, processing and transportation of natural gas; and the transportation, fractionation, storage and marketing of NGLs. MPLX’s principal executive office is located in Findlay, Ohio. MPLX was formed on March 27, 2012 as a Delaware limited partnership and completed its initial public offering on October 31, 2012.

MPLX’s business consists of 2two segments based on the nature of services it offers: Logistics and Storage (“L&S”), which relates primarily to crude oil, refined products, ~~and~~ other hydrocarbon-based ~~products;~~products and renewables; and Gathering and Processing (“G&P”), which relates primarily to natural gas and NGLs. See Note 7 for additional information regarding the operations and results of these segments.

Basis of Presentation

~~The accompanying~~These interim consolidated financial statements are unaudited; however, in the opinion of MPLX’s management, these statements reflect all adjustments necessary for a fair statement of the results for the periods reported. All such adjustments are of a normal, recurring nature unless otherwise disclosed. These interim consolidated financial statements, including the notes, have been prepared in accordance with the rules and regulations of the SEC applicable to interim period financial statements and do not include all of the information and disclosures required by GAAP for complete financial statements. Certain information derived from our audited annual financial statements, prepared in accordance with GAAP, has been condensed or omitted from these interim financial statements.

These interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, ~~2021.~~2022. The results of operations for the three and six months ended June 30, ~~2022~~2023 are not necessarily indicative of the results to be expected for the full year.

MPLX’s consolidated financial statements include all majority-owned and controlled subsidiaries. For non-wholly owned consolidated subsidiaries, the interests owned by third parties have been recorded as Noncontrolling interests on the accompanying Consolidated Balance Sheets. Intercompany ~~investments,~~ accounts and transactions have been eliminated. MPLX’s investments in which MPLX exercises significant influence but does not control and does not have a controlling financial interest are accounted for using the equity method. MPLX’s investments in VIEs in which MPLX exercises significant influence but does not control and is not the primary beneficiary are also accounted for using the equity method.

~~Certain prior period financial statement amounts have been reclassified to conform to current period presentation.~~

2. Accounting Standards

~~Recently~~Not Yet Adopted

ASU ~~2021-10, Government Assistance~~2023-01, Leases (Topic ~~832)~~842): ~~Disclosures by Business Entities about Government Assistance~~

Common Control Arrangements

In ~~November 2021,~~March 2023, the FASB issued ~~guidance requiring~~an ASU to amend certain provisions of ASC 842 that apply to arrangements between related parties under common control. The ASU amends the accounting for the amortization period of leasehold improvements in common-control leases for all entities and requires certain disclosures when the lease term is shorter than the useful life of the asset. This ASU is effective for ~~certain types of government assistance that have been accounted for by analogy to grant or contribution models. Disclosures will include information about~~fiscal years beginning after December 15, 2023, including interim periods within those fiscal years. Early adoption is permitted. We do not expect the ~~type of transactions, accounting and the impact on financial statements. MPLX prospectively adopted this standard in the first quarter of 2022. The adoption~~application of this ~~standard did not~~ASU to have a material impact on our consolidated financial statements or financial disclosures.

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3. Investments and Noncontrolling Interests

The following table presents MPLX’s equity method investments at the dates indicated:

Ownership as of Carrying value at
June 30, June 30, December 31,
(In millions, except ownership percentages) 2022 2022 2021
L&S
MarEn Bakken Company LLC(1)
25% $ 493 $ 449
Illinois Extension Pipeline Company, L.L.C. 35% 244 243
LOOP LLC 41% 278 265
Andeavor Logistics Rio Pipeline LLC(2)
67% 180 183
Minnesota Pipe Line Company, LLC 17% 182 183
Whistler Pipeline LLC(2)
38% 174 155
Explorer Pipeline Company 25% 59 66
W2W Holdings LLC(2)
50% 59 58
Other(2)
136 116
Total L&S 1,805 1,718
G&P
MarkWest Utica EMG, L.L.C.(2)
57% 683 680
Sherwood Midstream LLC(2)
50% 535 544
MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C.(2)
67% 339 332
MarkWest Torñado GP, L.L.C.(2)
60% 286 246
Rendezvous Gas Services, L.L.C.(2)
78% 143 147
Sherwood Midstream Holdings LLC(2)
51% 130 136
Centrahoma Processing LLC 40% 134 133
Other(2)
44 45
Total G&P 2,294 2,263
Total $ 4,099 $ 3,981


		Ownership as of	Carrying value at
		June 30,	June 30,		December 31,
(In millions, except ownership percentages)	VIE	2023	2023		2022
L&S
Andeavor Logistics Rio Pipeline LLC	X	67%	$	176	$	177
Illinois Extension Pipeline Company, L.L.C.		35%	241		236
LOOP LLC		41%	296		287
MarEn Bakken Company LLC(1)		25%	460		475
Minnesota Pipe Line Company, LLC		17%	176		178
Whistler Pipeline LLC		38%	213		211
Other(2)	X		289		269
Total L&S			1,851		1,833
G&P
Centrahoma Processing LLC		40%	123		131
MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C	X	67%	344		335
MarkWest Torñado GP, L.L.C.	X	60%	310		306
MarkWest Utica EMG, L.L.C.	X	58%	693		669
Rendezvous Gas Services, L.L.C.	X	78%	133		137
Sherwood Midstream Holdings LLC	X	51%	119		125
Sherwood Midstream LLC	X	50%	507		512
Other(2)	X		44		47
Total G&P			2,273		2,262
Total			$	4,124	$	4,095

(1) The investment in MarEn Bakken Company LLC includes our 9.19 percent indirect interest in a joint venture (“Dakota Access”) that owns and operates the Dakota Access Pipeline and Energy Transfer Crude Oil Pipeline projects, collectively referred to as the Bakken Pipeline system or DAPL.

(2) ~~Investments deemed to be VIEs.~~ Some investments included within Other have also been deemed to be VIEs.

For those entities that have been deemed to be VIEs, neither MPLX nor any of its subsidiaries have been deemed to be the primary beneficiary due to voting rights on significant matters. While we have the ability to exercise influence through participation in the management committees which make all significant decisions, we have equal influence over each committee as a joint interest partner and all significant decisions require the consent of the other investors without regard to economic ~~interest; as~~interest. As such, we have determined that these entities should not be consolidated and ~~apply~~applied the equity method of accounting with respect to our investments in each entity.

Sherwood Midstream LLC (“Sherwood Midstream”) has been deemed the primary beneficiary of Sherwood Midstream Holdings LLC (“Sherwood Midstream Holdings”) due to its controlling financial interest through its authority to manage the joint venture. As a result, Sherwood Midstream consolidates Sherwood Midstream Holdings. Therefore, MPLX also reports its portion of Sherwood Midstream Holdings’ net assets as a component of its investment in Sherwood Midstream. As of June 30, 2022, MPLX has a 24.55 percent indirect ownership interest in Sherwood Midstream Holdings through Sherwood Midstream.

MPLX’s maximum exposure to loss as a result of its involvement with equity method investments includes its equity investment, any additional capital contribution commitments and any operating expenses incurred by the subsidiary operator in excess of its compensation received for the performance of the operating services. MPLX did not provide any financial support to equity method investments that it was not contractually obligated to provide during the six months ended June 30, ~~2022.~~

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~~Summarized financial~~2023. See Note 14 for information ~~for MPLX’s~~on our Guarantees related to indebtedness of equity method ~~investments for the six months ended June 30, 2022 and 2021 is as follows:~~

Six Months Ended June 30, 2022
(In millions) VIEs Non-VIEs Total
Revenues and other income $ 550 $ 637 $ 1,187
Costs and expenses 299 279 578
Income from operations 251 358 609
Net income 227 328 555
Income from equity method investments $ 124 $ 86 $ 210

investees.

Six Months Ended June 30, 2021
(In millions) VIEs Non-VIEs Total
Revenues and other income $ 336 $ 607 $ 943
Costs and expenses 217 284 501
Income from operations 119 323 442
Net income 105 283 388
Income from equity method investments $ 73 $ 63 $ 136

~~Summarized balance sheet information for MPLX’s equity method investments as of June 30, 2022 and December 31, 2021 is as follows:~~

June 30, 2022
(In millions) VIEs Non-VIEs Total
Current assets $ 363 $ 394 $ 757
Noncurrent assets 7,583 5,062 12,645
Current liabilities 292 249 541
Noncurrent liabilities $ 2,464 $ 805 $ 3,269

December 31, 2021
(In millions) VIEs Non-VIEs Total
Current assets $ 335 $ 411 $ 746
Noncurrent assets 7,439 4,895 12,334
Current liabilities 217 310 527
Noncurrent liabilities $ 2,461 $ 788 $ 3,249

4. Related Party Agreements and Transactions

MPLX engages in transactions with both MPC and certain of its equity method investments as part of its normal business; however, transactions with MPC make up the majority of MPLX’s related party transactions. Transactions with related parties are further described below.

MPLX has various long-term, fee-based commercial agreements with MPC. Under these agreements, MPLX provides transportation, gathering, terminal, fuels distribution, marketing, storage, management, operational and other services to MPC. MPC has committed to provide MPLX with minimum quarterly throughput volumes on crude oil and refined products and other fees for storage ~~capacity,~~capacity; operating and management ~~fees,~~fees; as well as reimbursements for certain direct and indirect costs. MPC has also committed to provide a fixed fee for 100 percent of available capacity for boats, barges and third-party chartered equipment under the marine transportation service agreement. MPLX also has a keep-whole commodity agreement with MPC under which MPC pays us a processing fee for NGLs related to keep-whole agreements and delivers shrink gas to the producers on our behalf. We pay MPC a marketing fee in exchange for assuming the commodity risk. Additionally, MPLX has obligations to

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MPC for services provided to MPLX by MPC under omnibus and employee services-type agreements as well as other agreements.

~~On June 30, 2022, MPLX~~During the second quarter of 2023, several terminal and ~~MPC entered into a Master Amendment to Transportation Services Agreements (“Master Amendment”). The Master Amendment extends the term of six transportation~~storage services agreements ~~through 2032 and provides~~

~~Table~~with MPC were amended for certain items, including exercise of ~~Contents~~

~~for automatic renewals of up~~a five-year renewal option, with terms now extending to ~~two additional five-year terms, subject to either party providing written notice at least six months prior to the end of the then-current term.~~2028.

Related Party Loan

MPLX is party to a loan agreement ~~with MPC Investment LLC (“MPC Investment”)~~ (the “MPC Loan Agreement”). with MPC. Under the terms of the ~~agreement,~~ MPC ~~Investment~~Loan Agreement, MPC extends loans to MPLX on a revolving basis as requested by MPLX and as agreed to by ~~MPC Investment.~~MPC. The borrowing capacity of the MPC Loan Agreement is $1.5 billion aggregate principal amount of all loans outstanding at any one time. The ~~loan agreement~~MPC Loan Agreement is scheduled to expire, and borrowings under the loan agreement are scheduled to mature and become due and payable on July 31, 2024, provided that MPC ~~Investment~~ may demand payment of all or any portion of the outstanding principal amount of the loan, together with all accrued and unpaid interest and other amounts (if any), at any time prior to maturity. Borrowings under the MPC Loan Agreement bear interest at ~~LIBOR~~one-month term SOFR adjusted upward by 0.10 percent plus 1.25 percent or such lower rate as would be applicable to such loans under the MPLX Credit Agreement as discussed in Note 11.

~~Activity~~There was no activity on the MPC Loan Agreement ~~was as follows:~~

Six Months Ended June 30,
(In millions) 2022 2021
Borrowings $ 2,824 $ 4,435
Average interest rate of borrowings 1.458 % 1.354 %
Repayments $ 4,274 $ 3,942
Outstanding balance at end of period $ — $ 493
for the six months ended June 30, 2023.

Related Party Revenue

Related party sales to MPC primarily consist of crude oil and refined products pipeline and trucking transportation services based on tariff or contracted rates; storage, terminal and fuels distribution services based on contracted rates; and marine transportation services. Related party sales to MPC also consist of revenue related to volume deficiency credits.

MPLX also has operating agreements with MPC under which it receives a fee for operating MPC’s retained pipeline assets and a fixed annual fee for providing oversight and management services required to run the marine business. MPLX also receives management fee revenue for engineering, construction and administrative services for operating certain of its equity method investments. ~~These~~Amounts earned under these agreements are classified as Other income - related parties onin the Consolidated Statements of Income.

Certain product sales to MPC and other related parties net to zero within the consolidated financial statements as the transactions are recorded net due to the terms of the agreements under which such product was sold. For the three and six months ended June 30, ~~2022,~~2023, these sales totaled ~~$281~~$150 million and ~~$574~~$348 million, respectively. For the three and six months ended June 30, ~~2021,~~2022, these sales totaled ~~$177~~$281 million and ~~$345~~$574 million, respectively.

Related Party Expenses

MPC charges MPLX for executive management services and certain general and administrative services provided to MPLX under the terms of our omnibus agreements (“Omnibus charges”)~~. Omnibus charges included in Rental cost of sales - related parties primarily relate to services that support MPLX’s rental operations~~ and ~~maintenance of assets available~~ for rent, as well as compensation expenses. Omnibus charges included in Purchases - related parties primarily relate to services that support MPLX’s operations and maintenance activities, as well as compensation expenses. Omnibus charges included in General and administrative expenses primarily relate to services that support MPLX’s executive management, accounting and human resources activities. MPLX also obtainscertain employee services ~~from MPC~~provided to MPLX under employee services agreements (“ESA charges”). Omnibus charges and ESA charges ~~for personnel directly involved in or supporting operations and maintenance activities related to rental services~~ are classified as Rental cost of sales - related ~~parties. ESA charges for personnel directly involved in or supporting operations and maintenance activities related to other services are classified as~~parties, Purchases - related ~~parties. ESA charges for personnel involved in executive management, accounting and human resources activities are classified as~~parties, or General and administrative ~~expenses.~~expenses depending on the nature of the asset or activity with which the costs are associated. In addition to these agreements, MPLX purchases products from MPC, makes payments to MPC in its capacity as general contractor to MPLX, and has certain rent and lease agreements with MPC.

For the three and six months ended June 30, 2023, General and administrative expenses incurred from MPC totaled $61 million and $125 million, respectively. For the three and six months ended June 30, 2022, General and administrative expenses incurred from MPC totaled $58 million and $113 million, respectively. ~~For the three and six months ended June 30, 2021, General and administrative expenses incurred from MPC totaled $63 million and $120 million, respectively.~~

Some charges incurred under the omnibus and ~~ESA~~employee service agreements are related to engineering services and are associated with assets under construction. These charges are added to Property, plant and equipment, net on the Consolidated Balance Sheets. For the three and six months ended June 30, ~~2022,~~2023, these charges totaled ~~$19~~$18 million and ~~$38~~$28 million, respectively. For the three and six months ended June 30, ~~2021,~~2022, these charges totaled ~~$15~~$19 million and ~~$27~~$38 million, respectively.

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Related Party Assets and Liabilities

Assets and liabilities with related parties appearing onin the Consolidated Balance Sheets are detailed in the table below. This table identifies the various components of related party assets and liabilities, including those associated with leases and deferred revenue on minimum volume commitments. If MPC fails to meet its minimum committed volumes, MPC will pay MPLX a deficiency payment based on the terms of the agreement. The deficiency amounts received under these agreements (excluding payments received under agreements classified as sales-type leases) are recorded as Current liabilities - related parties. In many cases, MPC may then apply the amount of any such deficiency payments as a credit for volumes in excess of its minimum volume commitment in future periods under the terms of the applicable agreements. MPLX recognizes related party revenues for the deficiency payments when credits are used for volumes in excess of minimum quarterly volume commitments, where it is probable the customer will not use the credit in future periods or upon the expiration of the credits. The use or expiration of the

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credits is a decrease in Current liabilities - related parties. Deficiency payments under agreements that have been classified as sales-type leases are recorded as a reduction against the corresponding lease receivable. In addition, capital projects MPLX undertakes at the request of MPC are reimbursed in cash and recognized as revenue over the remaining term of the applicable agreements or in some cases, as a contribution from MPC.


(In millions)	(In millions)	June 30, 2022		December 31, 2021		(In millions)	June 30, 2023		December 31, 2022
Current assets - related parties	Current assets - related parties					Current assets - related parties
Receivables	Receivables	$	628	$	555	Receivables	$	510	$	610
Lease receivables						Lease receivables	129		111
Prepaid	Prepaid	10		4		Prepaid	10		5
Other	Other	2		3		Other	5		3
Lease receivables		91		82
Total	Total	731		644		Total	654		729
Noncurrent assets - related parties	Noncurrent assets - related parties					Noncurrent assets - related parties
Long-term lease receivables						Long-term lease receivables	844		883
Right of use assets						Right of use assets	228		228
Unguaranteed residual asset						Unguaranteed residual asset	105		87
Long-term receivables	Long-term receivables	27		31		Long-term receivables	22		27
Right of use assets		229		229
Long-term lease receivables		822		854
Unguaranteed residual asset		64		47
Total	Total	1,142		1,161		Total	1,199		1,225
Current liabilities - related parties	Current liabilities - related parties					Current liabilities - related parties
MPC loan agreement and other payables(1)	MPC loan agreement and other payables(1)	329		1,702		MPC loan agreement and other payables(1)	254		262
Deferred revenue						Deferred revenue	81		80
Operating lease liabilities	Operating lease liabilities	1		1		Operating lease liabilities	1		1

Deferred revenue - Minimum volume deficiencies		32		35

Deferred revenue - Project reimbursements		41		42
Total	Total	403		1,780		Total	336		343
Long-term liabilities - related parties	Long-term liabilities - related parties					Long-term liabilities - related parties
Long-term operating lease liabilities	Long-term operating lease liabilities	228		228		Long-term operating lease liabilities	226		228

Long-term deferred revenue - Project reimbursements		75		74
Long-term deferred revenue						Long-term deferred revenue	115		110
Total	Total	$	303	$	302	Total	$	341	$	338

(1) Includes $1,450 million as of December 31, 2021 related to outstanding borrowings on the intercompany loan with MPC, which are included in Current liabilities - related parties on the Consolidated Balance Sheets. There were no borrowings outstanding on the ~~intercompany loan with~~ MPC Loan Agreement as of June 30, 2023 or December 31, 2022.

Other Related Party Transactions

From time to time, MPLX may also sell to or purchase from related parties, assets and inventory at the lesser of average unit cost or net realizable value.

5. Equity

The changes in the number of common units during the six months ended June 30, ~~2022~~2023 are summarized below:

(In units)

Common Units

Balance at December 31, ~~2021~~2022

~~1,016,178,378~~1,001,020,616

Unit-based compensation awards

~~183,478~~148,267

~~Units redeemed in unit repurchase program~~

~~(4,156,956)~~

Balance at June 30, ~~2022~~2023

~~1,012,204,900~~1,001,168,883

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Unit Repurchase Program

On ~~November~~August 2, ~~2020, MPLX~~2022, we announced the board authorization ~~of a unit repurchase program~~ for the repurchase of up to an additional $1 billion of ~~MPLX’s outstanding~~MPLX common units held by the public.

~~Total unit repurchases were as follows for the respective periods:~~

Three Months Ended June 30, Six Months Ended June 30,
(In millions, except per unit data) 2022 2021 2022 2021
Number of common units repurchased 1 6 4 12
Cash paid for common units repurchased $ 35 $ 155 $ 135 $ 310
Average cost per unit $ 33.74 $ 27.40 $ 32.48 $ 26.02

~~As of June 30, 2022, we had $202 million remaining under the existing~~ This unit repurchase ~~authorization. On August 2, 2022, MPLX announced the board of directors approved an incremental $1 billion unit repurchase authorization. The unit repurchase authorizations have~~authorization has no expiration date. We may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, accelerated unit repurchases, tender offers or open market solicitations for units, some of which may be effected through Rule 10b5-1 plans. The timing and amount of future repurchases, if any, will depend upon several factors, including market and business conditions, and such repurchases may be discontinued at any time.

No units were repurchased during the three or six months ended June 30, 2023. As of June 30, 2023, we had $846 million remaining under the unit repurchase authorization.

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Redemption of the Series B Preferred Units

On February 15, 2023, MPLX ~~has~~exercised its right to redeem all 600,000 outstanding units of 6.875 percent Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units ~~representing limited partner interests of MPLX with a price to the public of $1,000 per unit~~ (the “Series B preferred units”). ~~The~~MPLX paid unitholders the Series B preferred unit redemption price of $1,000 per unit.

Distributions on the Series B preferred units are pari passu with the Series A preferred units with respect to distribution rights and rights upon liquidation. Series B preferred unitholders are entitled to receive a fixed distribution of $68.75 per unit, per annum,were payable semi-annually in arrears on the 15th day, or the first business day thereafter, of February and August of each year up to and including February 15, 2023. ~~After~~In accordance with these terms, MPLX made a final cash distribution of $21 million to Series B preferred unitholders on February 15, 2023, in conjunction with the ~~holders of Series B preferred units are entitled to receive cumulative, quarterly distributions payable~~redemption.

The changes 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. MPLX has the right to redeem some or all of the Series B preferred units, at any time, on or after February 15, 2023 at the Series B preferred unit ~~redemption price~~balance during the six months ended June 30, 2023 and June 30, 2022 are included in the Consolidated Statements of ~~$1,000 per unit, plus any accumulated and unpaid distributions up to the redemption date.~~Equity within Series B preferred units.

~~Cash distributions~~Distributions

Quarterly distributions for ~~2022~~2023 and ~~2021~~2022 are summarized below:


(Per common unit)	(Per common unit)	2022		2021		(Per common unit)	2023		2022
March 31,	March 31,	$	0.7050	$	0.6875	March 31,	$	0.775	$	0.705
June 30,	June 30,	0.7050		0.6875		June 30,	0.775		0.705

~~In accordance with the distribution rights discussed above, MPLX will make a cash distribution totaling $21 million to Series B unitholders on August 15, 2022.~~

The allocation of total quarterly cash distributions to limited and preferred unitholders is as follows for the three and six months ended June 30, ~~2022~~2023 and ~~2021.~~June 30, 2022. Distributions, although earned, are not accrued until declared. MPLX’s distributions are declared subsequent to quarter end; therefore, the following table represents total cash distributions applicable to the period in which the

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distributions were earned.


		Three Months Ended June 30,				Six Months Ended June 30,					Three Months Ended June 30,				Six Months Ended June 30,
(In millions)	(In millions)	2022		2021		2022		2021		(In millions)	2023		2022		2023		2022
Common and preferred unit distributions:	Common and preferred unit distributions:									Common and preferred unit distributions:
Common unitholders, includes common units of general partner	Common unitholders, includes common units of general partner	$	714	$	705	$	1,427	$	1,412	Common unitholders, includes common units of general partner	$	776	$	714	$	1,552	$	1,427

Series A preferred unit distributions	Series A preferred unit distributions	21		21		42		41		Series A preferred unit distributions	23		21		46		42
Series B preferred unit distributions(1)	Series B preferred unit distributions(1)	10		10		21		21		Series B preferred unit distributions(1)	—		10		5		21
Total cash distributions declared	Total cash distributions declared	$	745	$	736	$	1,490	$	1,474	Total cash distributions declared	$	799	$	745	$	1,603	$	1,490

(1) The six months ended June 30, 2023, includes the portion of the $21 million distribution paid to the Series B preferred unitholders on February 15, 2023 that was earned during the period prior to redemption.

6. Net Income Per Limited Partner Unit

Net income per unit applicable to common units is computed by dividing net income attributable to MPLX LP less income allocated to participating securities by the weighted average number of common units outstanding.

During the three and six months ended June 30, ~~2022~~2023 and ~~2021,~~June 30, 2022, MPLX had participating securities consisting of common units, certain equity-based compensation awards, Series A preferred units, and Series B preferred units and also had dilutive potential common units consisting of certain equity-based compensation awards. Potential common units omitted from the diluted earnings per unit calculation for the three and six months ended June 30, 2023 andJune 30, 2022 ~~and 2021~~ were less than 1 million.

Three Months Ended June 30, Six Months Ended June 30,
(In millions) 2022 2021 2022 2021
Net income attributable to MPLX LP $ 875 $ 706 $ 1,700 $ 1,445
Less: Distributions declared on Series A preferred units 21 21 42 41
Distributions declared on Series B preferred units 10 10 21 21
Limited partners’ distributions declared on MPLX common units (including common units of general partner) 714 705 1,427 1,412
Undistributed net gain/ (loss) attributable to MPLX LP $ 130 $ (30) $ 210 $ (29)

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Three Months Ended June 30, 2022
(In millions, except per unit data) Limited Partners’
Common Units Series A Preferred Units Series B Preferred Units Total
Basic and diluted net income attributable to MPLX LP per unit
Net income attributable to MPLX LP:
Distributions declared $ 714 $ 21 $ 10 $ 745
Undistributed net gain attributable to MPLX LP 126 $ 4 — 130
Net income attributable to MPLX LP(1)
$ 840 $ 25 $ 10 $ 875
Weighted average units outstanding:
Basic 1,012
Diluted 1,012
Net income attributable to MPLX LP per limited partner unit:
Basic $ 0.83
Diluted $ 0.83


	Three Months Ended June 30,				Six Months Ended June 30,
(In millions)	2023		2022		2023		2022
Net income attributable to MPLX LP	$	933	$	875	$	1,876	$	1,700
Less: Distributions declared on Series A preferred units	23		21		46		42

Distributions declared on Series B preferred units	—		10		5		21
Limited partners’ distributions declared on MPLX common units (including common units of general partner)	776		714		1,552		1,427

Undistributed net gain attributable to MPLX LP	$	134	$	130	$	273	$	210


	Three Months Ended June 30, 2023
(In millions, except per unit data)	Limited Partners’ Common Units		Series A Preferred Units		Total
Basic and diluted net income attributable to MPLX LP per unit
Net income attributable to MPLX LP:
Distributions declared	$	776	$	23	$	799
Undistributed net gain attributable to MPLX LP	130		4		134
Net income attributable to MPLX LP(1)	906		$	27	933


Weighted average units outstanding:
Basic	1,001
Diluted	1,001
Net income attributable to MPLX LP per limited partner unit:
Basic	$	0.91
Diluted	$	0.91

(1) Allocation of net income attributable to MPLX LP assumes all earnings for the period had been distributed based on the distribution priorities applicable to the period.


	Three Months Ended June 30, 2022
(In millions, except per unit data)	Limited Partners’ Common Units		Series A Preferred Units		Series B Preferred Units		Total
Basic and diluted net income attributable to MPLX LP per unit
Net income attributable to MPLX LP:
Distributions declared	$	714	$	21	$	10	$	745
Undistributed net gain attributable to MPLX LP	126		4		—		130
Net income attributable to MPLX LP(1)	$	840	$	25	$	10	$	875
Weighted average units outstanding:
Basic	1,012
Diluted	1,012
Net income attributable to MPLX LP per limited partner unit:
Basic	$	0.83
Diluted	$	0.83

14(1) Allocation of net income attributable to MPLX LP assumes all earnings for the period had been distributed based on the distribution priorities applicable to the period.

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		Three Months Ended June 30, 2021						Six Months Ended June 30, 2023
(In millions, except per unit data)	(In millions, except per unit data)	Limited Partners’ Common Units		Series A Preferred Units		Series B Preferred Units			Total		(In millions, except per unit data)	Limited Partners’ Common Units		Series A Preferred Units		Series B Preferred Units		Total
Basic and diluted net income attributable to MPLX LP per unit	Basic and diluted net income attributable to MPLX LP per unit										Basic and diluted net income attributable to MPLX LP per unit
Net income attributable to MPLX LP:	Net income attributable to MPLX LP:										Net income attributable to MPLX LP:
Distributions declared	Distributions declared	$	705	$	21	$	10		$	736	Distributions declared	$	1,552	$	46	$	5	$	1,603
Undistributed net loss attributable to MPLX LP		(30)		—		—			(30)
Undistributed net gain attributable to MPLX LP											Undistributed net gain attributable to MPLX LP	265		8		—		273
Net income attributable to MPLX LP(1)	Net income attributable to MPLX LP(1)	$	675	$	21	$	10		$	706	Net income attributable to MPLX LP(1)	1,817		$	54	$	5	1,876
Impact of redemption of Series B preferred units											Impact of redemption of Series B preferred units	(5)						(5)
Income available to common unitholders											Income available to common unitholders	$	1,812					$	1,871
Weighted average units outstanding:	Weighted average units outstanding:										Weighted average units outstanding:
Basic	Basic	1,029									Basic	1,001
Diluted	Diluted	1,029									Diluted	1,001
Net income attributable to MPLX LP per limited partner unit:	Net income attributable to MPLX LP per limited partner unit:										Net income attributable to MPLX LP per limited partner unit:
Basic	Basic	$	0.66								Basic	1.81
Diluted	Diluted	$	0.66								Diluted	1.81

(1) Allocation of net income attributable to MPLX LP assumes all earnings for the period had been distributed based on the distribution priorities applicable to the period.


	Six Months Ended June 30, 2022
(In millions, except per unit data)	Limited Partners’ Common Units		Series A Preferred Units		Series B Preferred Units		Total
Basic and diluted net income attributable to MPLX LP per unit
Net income attributable to MPLX LP:
Distributions declared	$	1,427	$	42	$	21	$	1,490
Undistributed net gain attributable to MPLX LP	204		6		—		210
Net income attributable to MPLX LP(1)	$	1,631	$	48	$	21	$	1,700
Weighted average units outstanding:
Basic	1,013
Diluted	1,014
Net income attributable to MPLX LP per limited partner unit:
Basic	$	1.61
Diluted	$	1.61

(1) Allocation of net income attributable to MPLX LP assumes all earnings for the period had been distributed based on the distribution priorities applicable to the period.

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Six Months Ended June 30, 2021
(In millions, except per unit data) Limited Partners’
Common Units Series A Preferred Units Series B Preferred Units Total
Basic and diluted net income attributable to MPLX LP per unit
Net income attributable to MPLX LP:
Distributions declared $ 1,412 $ 41 $ 21 $ 1,474
Undistributed net loss attributable to MPLX LP (29) — — (29)
Net income attributable to MPLX LP(1)
$ 1,383 $ 41 $ 21 $ 1,445
Weighted average units outstanding:
Basic 1,033
Diluted 1,033
Net income attributable to MPLX LP per limited partner unit:
Basic $ 1.34
Diluted $ 1.34

~~(1) Allocation of net income attributable to MPLX LP assumes all earnings for the period had been distributed based on the distribution priorities applicable to the period.~~

7. Segment Information

MPLX’s chief operating decision maker (“CODM”) is the chief executive officer ~~(“CEO”)~~ of its general partner. The ~~CEO~~CODM reviews MPLX’s discrete financial information, makes operating decisions, assesses financial performance and allocates resources on a type of service basis. MPLX has 2two reportable segments: L&S and G&P. Each of these segments is organized and managed based upon the nature of the products and services it offers.

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

•G&P – gathers, processes and transports natural gas; and transports, fractionates, stores and markets NGLs.

Our ~~CEO~~CODM evaluates the performance of our segments using Segment Adjusted EBITDA. Amounts included in net income and excluded from Segment Adjusted EBITDA include: (i) depreciation and amortization; (ii) interest and other financial costs; (iii) ~~impairment expense; (iv)~~ income/(loss) from equity method investments; ~~(v)~~(iv) distributions and adjustments related to equity method investments; (v) gain on sales-type leases; (vi) impairment expense; (vii) noncontrolling interests; and ~~(vii)~~(viii) other adjustments, as ~~deemed necessary.~~applicable. These items are either: (i) believed to be non-recurring in nature; (ii) not believed to be allocable or controlled by the segment; or (iii) are

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not tied to the operational performance of the segment. Assets by segment are not a measure used to assess the performance of the Partnership by our ~~CEO~~CODM and thus are not reported in our disclosures.

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The tables below present information about revenues and other income, Segment Adjusted EBITDA, capital expenditures and investments in unconsolidated affiliates for our reportable segments:


		Three Months Ended June 30,				Six Months Ended June 30,					Three Months Ended June 30,				Six Months Ended June 30,
(In millions)	(In millions)	2022		2021		2022		2021		(In millions)	2023		2022		2023		2022
L&S	L&S									L&S
Service revenue	Service revenue	$	1,010	$	992	$	1,993	$	1,945	Service revenue	$	1,060	$	1,010	$	2,093	$	1,993
Rental income	Rental income	208		176		383		425		Rental income	210		208		422		383
Product related revenue	Product related revenue	7		4		11		8		Product related revenue	3		7		8		11
Sales-type lease revenue	Sales-type lease revenue	114		136		225		173		Sales-type lease revenue	125		114		250		225
Income from equity method investments	Income from equity method investments	59		35		111		71		Income from equity method investments	82		59		153		111
Other income	Other income	22		16		34		31		Other income	18		22		32		34
Total segment revenues and other income(1)	Total segment revenues and other income(1)	1,420		1,359		2,757		2,653		Total segment revenues and other income(1)	1,498		1,420		2,958		2,757
Segment Adjusted EBITDA(2)	Segment Adjusted EBITDA(2)	966		947		1,870		1,843		Segment Adjusted EBITDA(2)	1,022		966		2,048		1,870

Capital expenditures	Capital expenditures	81		76		158		135		Capital expenditures	110		81		178		158
Investments in unconsolidated affiliates	Investments in unconsolidated affiliates	10		13		78		22		Investments in unconsolidated affiliates	1		10		16		78
G&P	G&P									G&P
Service revenue	Service revenue	505		493		991		1,001		Service revenue	546		505		1,071		991
Rental income	Rental income	92		91		173		183		Rental income	52		92		103		173
Product related revenue	Product related revenue	860		407		1,521		804		Product related revenue	467		860		1,031		1,521
Sales-type lease revenue										Sales-type lease revenue	33		—		67		—
Income from equity method investments	Income from equity method investments	52		31		99		65		Income from equity method investments	63		52		126		99
Other income	Other income	11		14		9		28		Other income	31		11		47		9
Total segment revenues and other income(1)	Total segment revenues and other income(1)	1,520		1,036		2,793		2,081		Total segment revenues and other income(1)	1,192		1,520		2,445		2,793
Segment Adjusted EBITDA(2)	Segment Adjusted EBITDA(2)	491		427		980		883		Segment Adjusted EBITDA(2)	509		491		1,002		980

Capital expenditures	Capital expenditures	95		36		190		66		Capital expenditures	143		95		266		190
Investments in unconsolidated affiliates	Investments in unconsolidated affiliates	$	36	$	36	$	78	$	62	Investments in unconsolidated affiliates	$	25	$	36	$	61	$	78

(1) Within the total segment revenues and other income amounts presented above, third party revenues for the L&S segment were $187 million and $357 million for the three and six months ended June 30, 2023, respectively, and $158 million and $293 million for the three and six months ended June 30, 2022, ~~respectively, and $138~~respectively. Third party revenues for the G&P segment were $1,139 million and ~~$267~~$2,305 million for the three and six months ended June 30, ~~2021, respectively. Third party revenues for the G&P segment were~~2023, respectively, and $1,454 million and $2,666 million for the three and six months ended June 30, 2022, ~~respectively, and $988 million and $1,977 million for the three and six months ended June 30, 2021,~~ respectively.

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

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


		Three Months Ended June 30,				Six Months Ended June 30,					Three Months Ended June 30,				Six Months Ended June 30,
(In millions)	(In millions)	2022		2021		2022		2021		(In millions)	2023		2022		2023		2022
Reconciliation to Net income:	Reconciliation to Net income:									Reconciliation to Net income:
L&S Segment Adjusted EBITDA	L&S Segment Adjusted EBITDA	$	966	$	947	$	1,870	$	1,843	L&S Segment Adjusted EBITDA	$	1,022	$	966	$	2,048	$	1,870
G&P Segment Adjusted EBITDA	G&P Segment Adjusted EBITDA	491		427		980		883		G&P Segment Adjusted EBITDA	509		491		1,002		980
Total reportable segments	Total reportable segments	1,457		1,374		2,850		2,726		Total reportable segments	1,531		1,457		3,050		2,850
Depreciation and amortization(1)	Depreciation and amortization(1)	(310)		(318)		(623)		(647)		Depreciation and amortization(1)	(310)		(310)		(606)		(623)
Impairment expense		—		(42)		—		(42)
Interest and other financial costs	Interest and other financial costs	(233)		(216)		(455)		(441)		Interest and other financial costs	(233)		(233)		(476)		(455)
Income from equity method investments	Income from equity method investments	111		66		210		136		Income from equity method investments	145		111		279		210
Distributions/adjustments related to equity method investments	Distributions/adjustments related to equity method investments	(152)		(121)		(284)		(242)		Distributions/adjustments related to equity method investments	(190)		(152)		(343)		(284)

Other		1		(38)		—		(47)
Adjusted EBITDA attributable to noncontrolling interests	Adjusted EBITDA attributable to noncontrolling interests	10		10		19		20		Adjusted EBITDA attributable to noncontrolling interests	10		10		20		19

Other(2)										Other(2)	(11)		1		(30)		—
Net income	Net income	$	884	$	715	$	1,717	$	1,463	Net income	$	942	$	884	$	1,894	$	1,717

(1) Depreciation and amortization attributable to L&S was $140 million and $269 million for the three and six months ended June 30, 2023, respectively, and $129 million and $259 million for the three and six months ended June 30, 2022, ~~respectively,~~respectively. Depreciation and ~~$136~~amortization attributable to G&P was $170 million and ~~$283~~$337 million for the three and six months ended June 30, ~~2021, respectively. Depreciation~~2023, respectively, and

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~~amortization attributable to G&P was~~ $181 million and $364 million for the three and six months ended June 30, 2022, ~~respectively,~~respectively.

(2) Includes unrealized derivative gain/(loss), non-cash equity-based compensation, provision for income taxes, and ~~$182 million and $364 million for the three and six months ended June 30, 2021, respectively.~~other miscellaneous items.

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8. Property, Plant and Equipment

Property, plant and equipment with associated accumulated depreciation is shown below:

June 30, 2022 December 31, 2021
(In millions) Gross PP&E Accumulated Depreciation Net PP&E Gross PP&E
Accumulated Depreciation(1)
Net PP&E
L&S $ 12,442 $ 3,424 $ 9,018 $ 12,371 $ 3,227 $ 9,144
G&P 14,312 3,563 10,749 14,175 3,277 10,898
Total $ 26,754 $ 6,987 $ 19,767 $ 26,546 $ 6,504 $ 20,042

~~(1) Includes property, plant and equipment impairment charges recorded in the second quarter of 2021, as discussed below.~~


	June 30, 2023						December 31, 2022
(In millions)	Gross PP&E		Accumulated Depreciation		Net PP&E		Gross PP&E		Accumulated Depreciation		Net PP&E
L&S	$	12,575	$	3,801	$	8,774	$	12,416	$	3,554	$	8,862
G&P	13,711		3,793		9,918		13,495		3,509		9,986
Total	$	26,286	$	7,594	$	18,692	$	25,911	$	7,063	$	18,848

~~Long-lived assets used in operations are assessed for impairment whenever changes in facts and circumstances indicate that the carrying value~~We capitalize interest as part of the ~~assets may not be recoverable based on~~cost of major projects during the ~~expected undiscounted future cash flow of an asset group. For purposes of impairment evaluation, long-lived assets must be grouped at~~construction period. Capitalized interest totaled $4 million and $7 million for the ~~lowest level~~three and six months ended June 30, 2023, respectively, and $3 million and $5 million for ~~which independent cash flows can be identified, which is at least at~~ the ~~segment level~~three and in some cases for similar assets in the same geographic region where cash flows can be separately identified. If the sum of the undiscounted cash flows is less than the carrying value of an asset group, fair value is calculated, and the carrying value is written down if greater than the calculated fair value.

In the second quarter of 2021, we recognized impairment expense of $42 million within our G&P segment related to our continued emphasis on portfolio optimization with the divestiture of several non-core assets and the closure of other non-core assets.six months ended June 30, 2022, respectively.

9. Fair Value Measurements

Fair Values – Recurring

~~Fair~~The following table presents the impact on the Consolidated Balance Sheets of MPLX’s financial instruments carried at fair value ~~measurements~~on a recurring basis as of June 30, 2023 and ~~disclosures relate primarily~~December 31, 2022 by fair value hierarchy level.


	June 30, 2023				December 31, 2022
(In millions)	Asset		Liability		Asset		Liability
Commodity contracts (Level 2)
Other current assets / Other current liabilities	$	10	$	—	$	—	$	—
Embedded derivatives in commodity contracts (Level 3)
Other current assets / Other current liabilities	—		7		—		10
Other noncurrent assets / Other long-term liabilities	—		46		—		51
Total carrying value in Consolidated Balance Sheets	$	10	$	53	$	—	$	61

Level 2 instruments include over-the-counter fixed swaps to ~~MPLX’s derivative positions as discussed~~mitigate the price risk from our sales of propane. The swap valuations are based on observable inputs in ~~Note 10.~~the form of forward prices based on Mont Belvieu propane forward spot prices and contain no significant unobservable inputs.

Level 3 instruments relate to an embedded derivative liability for a natural gas purchase commitment embedded in a keep-whole processing agreement. The fair value calculation for these Level 3 instruments used significant unobservable inputs including: (1) NGL prices interpolated and extrapolated due to inactive markets ranging from ~~$0.72~~$0.54 to ~~$1.98~~$1.34 per gallon with a weighted average of ~~$0.98~~$0.72 per gallon and (2) the probability of renewal of 100 percent for the five-year renewal term of the gas purchase commitment and related keep-whole processing agreement. Increases or decreases in the fractionation spread result in an increase or decrease in the fair value of the embedded derivative liability, respectively. ~~Beyond the embedded derivative discussed above, we had no outstanding commodity derivative contracts as~~

Table of ~~June 30, 2022 or December 31, 2021.~~Contents

Changes in Level 3 Fair Value Measurements

The following table is a reconciliation of the net beginning and ending balances recorded for net ~~assets and~~ liabilities classified as Level 3 in the fair value hierarchy.

Three Months Ended June 30, Six Months Ended June 30,
(In millions) 2022 2021 2022 2021
Embedded derivatives in commodity contracts (net):
Fair value at beginning of period $ (99) $ (66) $ (108) $ (63)
Total gain/ (loss) (realized and unrealized) included in earnings(1)
4 (39) 8 (45)
Settlements 3 3 8 6
Fair value at end of period (92) (102) (92) (102)
The amount of total gain/ (loss) for the period included in earnings attributable to the change in unrealized gain/ (loss) relating to liabilities still held at end of period $ 3 $ (39) $ 8 $ (41)


	Three Months Ended June 30,				Six Months Ended June 30,
(In millions)	2023		2022		2023		2022

Beginning balance	$	(58)	$	(99)	$	(61)	$	(108)
Unrealized and realized gain included in Net Income(1)	3		4		3		8
Settlements	2		3		5		8

Ending balance	$	(53)	$	(92)	$	(53)	$	(92)

The amount of total gain for the period included in earnings attributable to the change in unrealized gain relating to liabilities still held at end of period	$	3	$	3	$	3	$	8

(1) Gain/(loss) on derivatives embedded in commodity contracts are recorded in Purchased product costs onin the Consolidated Statements of Income.

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Fair Values – Reported

~~MPLX’s primary~~We believe the carrying value of our other financial instruments, ~~are~~including cash and cash equivalents, receivables, receivables from related parties, lease receivables, lease receivables from related parties, accounts payable, and payables to related parties, ~~and debt.~~approximate fair value. MPLX’s fair value assessment incorporates a variety of considerations, including ~~(1)~~ the duration of the instruments, ~~(2)~~ MPC’s investment-grade credit rating, and ~~(3)~~ the historical incurrence of and expected future insignificance of bad debt expense, which includes an evaluation of counterparty credit risk. ~~MPLX believes the carrying values of its current assets and liabilities approximate fair value.~~ The recorded value of the amounts outstanding under the bank revolving credit facility, if any, approximates fair value due to the variable interest rate that approximates current market rates. Derivative instruments are recorded at fair value, based on available market information (see Note 10).

The fair value of MPLX’s debt is estimated based on prices from recent ~~market non-binding indicative quotes. The debt fair values are considered~~trade activity and is categorized in Level 3 ~~measurements.~~of the fair value hierarchy. The following table summarizes the fair value and carrying value of our third-party debt, excluding finance leases and unamortized debt issuance costs:


		June 30, 2022				December 31, 2021					June 30, 2023				December 31, 2022
(In millions)	(In millions)	Fair Value		Carrying Value		Fair Value		Carrying Value		(In millions)	Fair Value		Carrying Value		Fair Value		Carrying Value
Outstanding debt(1)	Outstanding debt(1)	$	18,604	$	19,881	$	20,779	$	18,664	Outstanding debt(1)	$	18,671	$	20,527	$	18,095	$	19,905

(1) ~~Amounts~~Any amounts outstanding under the MPC Loan Agreement are not included in the table above, as the carrying value approximates fair value. This balance is reflected in Current liabilities - related parties onin the Consolidated Balance Sheets.

10. ~~Derivative Financial Instruments~~Derivatives

As of June 30, ~~2022,~~2023, MPLX had nothe following outstanding commodity contracts ~~beyond~~that were executed to manage the ~~embedded derivative discussed below.~~price risk associated with sales of propane during 2023:

Derivative contracts not designated as hedging instruments

Financial Position

Notional Quantity

Propane (gal)

Short

33,970,000

Embedded Derivative - MPLX has a natural gas purchase commitment embedded in a keep-whole processing agreement with a producer customer in the Southern Appalachian region expiring in December 2027. The customer has the unilateral option to extend the agreement for 1one five-year term through December 2032. For accounting purposes, the natural gas purchase commitment and the term extending option have been aggregated into a single compound embedded derivative. The probability of the customer exercising its option is determined based on assumptions about the customer’s potential business strategy decision points that may exist at the time they would elect whether to renew the contract. The changes in fair value of this compound embedded derivative are based on the difference between the contractual and index pricing, the probability of the producer customer exercising its option to extend, and the estimated favorability of these contracts compared to current market conditions. The changes in fair value are recorded in earnings through Purchased product costs onin the Consolidated Statements of Income. For further information regarding the fair value measurement of derivative instruments, see Note 9. As of June 30, ~~2022~~2023 and December 31, ~~2021,~~2022, the estimated fair value of this contract was a liability of ~~$92~~$53 million and ~~$108~~$61 million, respectively.

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Certain derivative positions are subject to master netting agreements, therefore, MPLX has elected to offset derivative assets and liabilities that are legally permissible to be offset. As of June 30, ~~2022~~2023 and December 31, ~~2021,~~2022, there were no derivative assets or liabilities that were offset onin the Consolidated Balance Sheets. ~~The impact of MPLX’s derivative instruments on its Consolidated Balance Sheets is summarized below:~~

(In millions) June 30, 2022 December 31, 2021
Derivative contracts not designated as hedging instruments and their balance sheet location Asset Liability Asset Liability
Commodity contracts
Other current assets / Other current liabilities $ — $ (14) $ — $ (15)
Other noncurrent assets / Other long-term liabilities — (78) — (93)
Total $ — $ (92) $ — $ (108)

We make a distinction between realized or 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. The impact of MPLX’s derivative contracts not designated as hedging instruments and the location of gains and losses recognized onin the Consolidated Statements of Income is summarized below:

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Three Months Ended June 30, Six Months Ended June 30,
(In millions) 2022 2021 2022 2021
Purchased product costs
Realized loss $ (3) $ (3) $ (8) $ (6)
Unrealized gain/ (loss) 7 (36) 16 (39)
Purchased product cost derivative gain/ (loss) $ 4 $ (39) $ 8 $ (45)


	Three Months Ended June 30,				Six Months Ended June 30,
(In millions)	2023		2022		2023		2022
Product sales:

Unrealized gain	$	8	$	—	$	10	$	—
Product sales derivative gain	8		—		10		—
Purchased product costs:
Realized loss	(2)		(3)		(5)		(8)
Unrealized gain	5		7		8		16
Purchased product cost derivative gain	3		4		3		8





Total derivative gain included in Net income	$	11	$	4	$	13	$	8

11. Debt

MPLX’s outstanding borrowings consist of the following:


(In millions)	(In millions)	June 30, 2022		December 31, 2021		(In millions)	June 30, 2023		December 31, 2022
MPLX LP:	MPLX LP:					MPLX LP:

MPLX Credit Agreement	MPLX Credit Agreement	$	—	$	300	MPLX Credit Agreement	$	—	$	—

Fixed rate senior notes	Fixed rate senior notes	20,032		18,532		Fixed rate senior notes	20,657		20,046
Consolidated subsidiaries:	Consolidated subsidiaries:					Consolidated subsidiaries:
MarkWest	MarkWest	23		23		MarkWest	12		23
ANDX	ANDX	45		45		ANDX	31		31

Financing lease obligations		8		9
Finance lease obligations						Finance lease obligations	7		8
Total	Total	20,108		18,909		Total	20,707		20,108
Unamortized debt issuance costs	Unamortized debt issuance costs	(114)		(102)		Unamortized debt issuance costs	(128)		(117)
Unamortized discount	Unamortized discount	(219)		(236)		Unamortized discount	(173)		(195)
Amounts due within one year	Amounts due within one year	(1,000)		(499)		Amounts due within one year	(1)		(988)
Total long-term debt due after one year	Total long-term debt due after one year	$	18,775	$	18,072	Total long-term debt due after one year	$	20,405	$	18,808

Credit Agreement

~~On July 7, 2022, MPLX entered into a new five-year~~MPLX’s credit agreement (the ~~“New MPLX~~“MPLX Credit Agreement”) ~~to replace the previous $3.5 billion credit facility that was scheduled to expire~~matures in July ~~2024. The New MPLX Credit Agreement,~~2027 and, among other things, provides for a $2 billion unsecured revolving credit facility ~~that matures in July 2027. The New MPLX Credit Agreement provides for~~and letter of credit issuing capacity under the facility of up to $150 million. Letter of credit issuing capacity is included in, not in addition to, the $2 billion borrowing ~~capacity of the New MPLX Credit Agreement. The financial covenants of the New MPLX Credit Agreement are substantially the same as those contained in the previous credit agreement.~~capacity. Borrowings under the ~~New~~ MPLX Credit Agreement bear interest, at MPLX’s election, at either the Adjusted Term SOFR or the Alternate Base Rate, both as defined in the ~~New~~ MPLX Credit Agreement, plus an applicable margin.

~~During~~There was no activity on the MPLX Credit Agreement during the six months ended June 30, ~~2022, MPLX borrowed $900 million under the MPLX Credit Agreement, at an average interest rate of 1.454 percent,~~and repaid $1,200 million. At June 30, 2022, MPLX had no outstanding borrowings and less than $1 million in letters of credit outstanding under the MPLX Credit Agreement, resulting in total availability of approximately $3.5 billion.2023.

Fixed Rate Senior Notes

MPLX’s senior notes, including those issued by consolidated subsidiaries, consist of various series of senior notes maturing between ~~2022~~2024 and 2058 with interest rates ranging from 1.750 percent to ~~5.500~~5.650 percent. Interest on each series of notes is payable semi-annually in arrears on various dates depending on the series of the notes.

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On ~~March 14, 2022,~~February 9, 2023, MPLX issued ~~$1.5~~$1.6 billion aggregate principal amount of ~~4.950~~notes, consisting of $1.1 billion principal amount of 5.00 percent senior notes due ~~March 2052~~2033 (the ~~“2052~~“2033 Senior Notes”) ~~in an underwritten public offering.~~and $500 million principal amount of 5.65 percent senior notes due 2053 (the “2053 Senior Notes”). The ~~2052~~2033 Senior Notes were offered at a price to the public of ~~98.982~~99.170 percent of par with interest payable semi-annually in arrears, commencing on September ~~14, 2022.~~1, 2023. The ~~net proceeds~~2053 Senior Notes were ~~used~~offered at a price to ~~repay amounts outstanding under~~ the ~~intercompany loan agreement~~public of 99.536 percent of par with ~~MPC and the MPLX revolving credit facility.~~interest payable semi-annually in arrears, commencing on September 1, 2023.

20On February 15, 2023, MPLX used $600 million of the net proceeds from the offering of the 2033 Senior Notes and 2053 Senior Notes described above to redeem all of the outstanding Series B preferred units. On March 13, 2023, MPLX used the remaining proceeds from the offering, and cash on hand, to redeem all of MPLX’s and MarkWest’s $1.0 billion aggregate principal amount of 4.50 percent senior notes due July 2023, at par, plus accrued and unpaid interest. The redemption resulted in a loss of $9 million due to the immediate expense recognition of unamortized debt discount and issuance costs for the three months ended March 31, 2023, which is included on the Consolidated Statements of Income as Other financial costs.

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12. Revenue

Disaggregation of Revenue

The following tables represent a disaggregation of revenue for each reportable segment for the three and six months ended June 30, ~~2022~~2023 and ~~2021:~~June 30, 2022:


	Three Months Ended June 30, 2023
(In millions)	L&S		G&P		Total
Revenues and other income:
Service revenue	$	92	$	543	$	635
Service revenue - related parties	968		3		971
Service revenue - product related	—		60		60
Product sales	—		376		376
Product sales - related parties	3		31		34
Total revenues from contracts with customers	$	1,063	$	1,013	2,076
Non-ASC 606 revenue(1)					614
Total revenues and other income					$	2,690


	Three Months Ended June 30, 2022
(In millions)	L&S		G&P		Total
Revenues and other income:
Service revenue	$	77	$	500	$	577
Service revenue - related parties	933		5		938
Service revenue - product related	—		118		118
Product sales	2		696		698
Product sales - related parties	5		46		51
Total revenues from contracts with customers	$	1,017	$	1,365	2,382
Non-ASC 606 revenue(1)					558
Total revenues and other income					$	2,940

Three Months Ended June 30, 2021
(In millions) L&S G&P Total
Revenues and other income:
Service revenue $ 91 $ 487 $ 578
Service revenue - related parties 901 6 907
Service revenue - product related — 76 76
Product sales 1 303 304
Product sales - related parties 3 28 31
Total revenues from contracts with customers $ 996 $ 900 1,896
Non-ASC 606 revenue(1)
499
Total revenues and other income $ 2,395

Six Months Ended June 30, 2022
(In millions) L&S G&P Total
Revenues and other income:
Service revenue $ 149 $ 982 $ 1,131
Service revenue - related parties 1,844 9 1,853
Service revenue - product related — 241 241
Product sales 3 1,192 1,195
Product sales - related parties 8 88 96
Total revenues from contracts with customers $ 2,004 $ 2,512 4,516
Non-ASC 606 revenue(1)
1,034
Total revenues and other income $ 5,550


	Six Months Ended June 30, 2023
(In millions)	L&S		G&P		Total
Revenues and other income:
Service revenue	175		1,065		$	1,240
Service revenue - related parties	1,918		6		1,924
Service revenue - product related	—		139		139
Product sales	2		794		796
Product sales - related parties	6		98		104
Total revenues from contracts with customers	$	2,101	$	2,102	4,203
Non-ASC 606 revenue(1)					1,200
Total revenues and other income					$	5,403

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Six Months Ended June 30, 2021
(In millions) L&S G&P Total
Revenues and other income:
Service revenue $ 175 $ 992 $ 1,167
Service revenue - related parties 1,770 9 1,779
Service revenue - product related — 153 153
Product sales 2 584 586
Product sales - related parties 6 67 73
Total revenues from contracts with customers $ 1,953 $ 1,805 3,758
Non-ASC 606 revenue(1)
976
Total revenues and other income $ 4,734


	Six Months Ended June 30, 2022
(In millions)	L&S		G&P		Total
Revenues and other income:
Service revenue	149		982		$	1,131
Service revenue - related parties	1,844		9		1,853
Service revenue - product related	—		241		241
Product sales	3		1,192		1,195
Product sales - related parties	8		88		96
Total revenues from contracts with customers	$	2,004	$	2,512	4,516
Non-ASC 606 revenue(1)					1,034
Total revenues and other income					$	5,550

(1) Non-ASC 606 Revenue includes rental income, sales-type lease revenue, income from equity method investments, and other ~~income.~~income (loss).

Contract Balances

Our receivables are primarily associated with customer contracts. Payment terms vary by product or service type, however the period between invoicing and payment is not significant. Included within the receivables are balances related to commodity sales on behalf of our producer customers, for which we remit the net sales price back to the producer customers upon completion of the sale. These balances are included in Receivables, net on the Consolidated Balance Sheets.

Under certain of our contracts, we recognize revenues in excess of billings which we present as contract assets. Contract assets typically relate to deficiency payments related to minimum volume commitments and aid in construction agreements where the revenue recognized and MPLX’s rights to consideration for work completed exceeds the amount billed to the customer. Contract assets are included in Other current assets and Other noncurrent assets on the Consolidated Balance Sheets.

Under certain of our contracts, we receive payments in advance of satisfying our performance obligations, which are recorded as contract liabilities. Contract liabilities, which we ~~refer to~~present as Deferred revenue and Long-term deferred revenue, typically relate to advance payments for aid in construction agreements and deferred customer credits associated with makeup rights and minimum volume commitments. Related to minimum volume commitments, breakage is estimated and recognized into service revenue in instances where it is probable the customer will not use the credit in future periods. We classify contract liabilities as current or long-term based on the timing of when we expect to recognize revenue.

Receivables, net primarily relate to our commodity sales. Portions of the Receivables, net balance are attributed to the sale of commodity product controlled by MPLX prior to sale while a significant portion of the balance relates to the sale of commodity product on behalf of our producer customers. The sales and related Receivables, net are commingled and excluded from the table below. MPLX remits the net sales price back to our producer customers upon completion of the sale. Each period end, certain amounts within accounts payable relate to our payments to producer customers. Such amounts are not deemed material at period end as a result of when we settle with each producer.

The tables below reflect the changes in ASC 606 contract balances ~~of each respective line,~~ for the six-month periods ended June 30, ~~2022~~2023 and ~~2021:~~June 30, 2022:

(In millions) Balance at December 31, 2021 Additions/ (Deletions)
Revenue Recognized(1)
Balance at
June 30, 2022
Contract assets $ 25 $ (14) $ — $ 11
Long-term contract assets 2 — — 2
Deferred revenue 56 26 (25) 57
Deferred revenue - related parties 60 54 (57) 57
Long-term deferred revenue 135 17 — 152
Long-term deferred revenue - related parties 31 (3) — 28
Long-term contract liabilities $ 5 $ — $ — $ 5

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(In millions)	Balance at December 31, 2022		Additions/ (Deletions)		Revenue Recognized(1)		Balance at June 30, 2023
Contract assets	$	21	$	(3)	$	—	$	18
Long-term contract assets	1		—		—		1
Deferred revenue	57		12		(22)		47
Deferred revenue - related parties	63		47		(48)		62
Long-term deferred revenue	216		49		—		265
Long-term deferred revenue - related parties	25		3		—		28
Contract liabilities	—		1		—		1
Long-term contract liabilities	$	2	$	(2)	$	—	$	—


(In millions)	(In millions)	Balance at December 31, 2020		Additions/ (Deletions)		Revenue Recognized(1)		Balance at June 30, 2021		(In millions)	Balance at December 31, 2021		Additions/ (Deletions)		Revenue Recognized(1)		Balance at June 30, 2022
Contract assets	Contract assets	$	40	$	(25)	$	1	$	16	Contract assets	$	25	$	(14)	$	—	$	11
Long-term contract assets	Long-term contract assets	2		—		—		2		Long-term contract assets	2		—		—		2
Deferred revenue	Deferred revenue	37		24		(17)		44		Deferred revenue	56		26		(25)		57
Deferred revenue - related parties	Deferred revenue - related parties	91		37		(50)		78		Deferred revenue - related parties	60		54		(57)		57
Long-term deferred revenue	Long-term deferred revenue	119		9		—		128		Long-term deferred revenue	135		17		—		152
Long-term deferred revenue - related parties	Long-term deferred revenue - related parties	48		(8)		—		40		Long-term deferred revenue - related parties	31		(3)		—		28
Long-term contract liabilities	Long-term contract liabilities	$	6	$	—	$	—	$	6	Long-term contract liabilities	$	5	$	—	$	—	$	5

(1) No significant revenue was recognized related to past performance obligations in the current periods.

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Remaining Performance Obligations

The table below includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) ~~at the end of the reporting period.~~

Asas of June 30, ~~2022, unsatisfied performance obligations included on the Consolidated Balance Sheets~~2023. The amounts presented below are ~~$293 million and will be recognized as revenue as the obligations are satisfied, which is expected~~generally limited to ~~occur over the next 22 years. A portion of this amount is not disclosed in the table below as it is deemed variable consideration due to volume variability.~~

(In millions)
2022 $ 943
2023 1,727
2024 1,601
2025 1,530
2026 1,373
2027 and thereafter 1,865
Total revenue on remaining performance obligations(1)(2)(3)
$ 9,039

~~(1) All~~ fixed consideration from contracts with customers that contain minimum volume commitments.

A significant portion of our future contracted revenue is ~~included in~~excluded from the amounts presented ~~above.~~below in accordance with ASC 606. Variable consideration that is constrained or not required to be estimated as it reflects our efforts to perform is ~~excluded.~~

~~(2) Arrangements deemed implicit leases and sales-type leases are~~ excluded from this ~~table.~~

(3) Only minimum volume commitments that are deemed fixed are included in the table above. MPLX has various minimum volume commitments in processing arrangements that vary based on the actual Btu content of the gas received. These amounts are deemed variable consideration and are excluded from the table above.

Wedisclosure. Additionally, we do not disclose information on the future performance obligations for any contract with an original expected duration of one year or ~~less.~~less, or that are terminable by our customer with little or no termination penalties. Potential future performance obligations related to renewals that have not yet been exercised or are not certain of exercise are excluded from the amounts presented below. Revenues classified as Rental income and Sales-type lease revenue are also excluded from this table.


(In billions)
2023	$	1.0
2024	1.9
2025	1.8
2026	1.7
2027	1.6
Thereafter	0.9
Total estimated revenue on remaining performance obligations	$	8.9

As of June 30, 2023, unsatisfied performance obligations included in the Consolidated Balance Sheets are $402 million and will be recognized as revenue as the obligations are satisfied, which is expected to occur over the next 21 years. A portion of this amount is not disclosed in the table above as it is deemed variable consideration due to volume variability.

13. Supplemental Cash Flow Information


		Six Months Ended June 30,					Six Months Ended June 30,
(In millions)	(In millions)	2022		2021		(In millions)	2023		2022
Net cash provided by operating activities included:	Net cash provided by operating activities included:					Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)	Interest paid (net of amounts capitalized)	$	393	$	414	Interest paid (net of amounts capitalized)	$	440	$	393
Income taxes paid	Income taxes paid	$	1	$	1	Income taxes paid	3		1

Non-cash investing and financing activities:						Non-cash investing and financing activities:
Net transfers of property, plant and equipment (to)/from materials and supplies inventories						Net transfers of property, plant and equipment (to)/from materials and supplies inventories	9		—
Net transfers of property, plant and equipment to lease receivable						Net transfers of property, plant and equipment to lease receivable	$	62	$	18

The Consolidated Statements of Cash Flows exclude changes to the Consolidated Balance Sheets that do not affect cash. The following is ~~the change~~a reconciliation of additions to property, plant and equipment ~~related~~ to total capital ~~accruals:~~expenditures:

Six Months Ended June 30,
(In millions) 2022 2021
Increase/ (decrease) in capital accruals $ 54 $ (34)

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~~14. Leases~~

~~Lease revenues included on the Consolidated Statements of Income were as follows:~~

Three Months Ended
June 30, 2022 Three Months Ended
June 30, 2021
(In millions) Related Party Third Party Related Party Third Party
Operating leases:
Rental income $ 198 $ 102 $ 168 $ 99
Sales-type leases:
Interest income (Sales-type rental revenue-fixed minimum) 112 — 135 —
Interest income (Revenue from variable lease payments) 2 — 1 —
Sales-type lease revenue $ 114 $ — $ 136 $ —

Six Months Ended
June 30, 2022 Six Months Ended
June 30, 2021
(In millions) Related Party Third Party Related Party Third Party
Operating leases:
Rental income $ 363 $ 193 $ 410 $ 198
Sales-type leases:
Interest income (Sales-type rental revenue-fixed minimum) 222 — 172 —
Interest income (Revenue from variable lease payments) 3 — 1 —
Sales-type lease revenue $ 225 $ — $ 173 $ —

See Note 4 for additional information on where related party lease assets are recorded in the Consolidated Balance Sheets. Capital expenditures related to assets subject to sales-type lease arrangements were $18 million for the ~~six~~ months ended June 30, 2022, these amounts are reflected as Additions to property, plant and equipment on the Consolidated Statements of Cash Flows. As of June 30, 2022 and December 31, 2021, third party lease assets are less than $1 million and are included within the Receivables, net and Other noncurrent assets captions within the Consolidated Balance Sheets.

During the second quarter of 2021, reimbursements for projects and changes to minimum volume commitments at certain L&S locations were agreed to between MPLX and MPC. These reimbursements and minimum volume commitments relate to the storage, transportation and terminal services agreements between MPLX and MPC at these locations and required the embedded leases within these agreements to be reassessed under ASC 842. As a result of the reassessment, certain leases were reclassified from an operating lease to a sales-type lease. Accordingly, the underlying assets previously shown on the Consolidated Balance Sheets associated with the sales-type leases were derecognized and the net investment in the lease (i.e., the sum of the present value of the future lease payments and the unguaranteed residual value of the assets) was recorded as a lease receivable during the respective periods. See Note 4 for the location of lease receivables and unguaranteed residual assets on the Consolidated Balance Sheets.

The difference between the net book value of the underlying assets and the net investment in the lease has been recorded as a Contribution from MPC in the Consolidated Statements of Equity given the impacted storage and terminal services agreements are related to a common control transaction. During the second quarter of 2021, MPLX derecognized approximately $421 million of property, plant and equipment, recorded a lease receivable of approximately $519 million, recorded an unguaranteed residual asset of approximately $14 million with the difference recorded as a deemed Contribution from MPC of $112 million.


	Six Months Ended June 30,
(In millions)	2023		2022
Additions to property, plant and equipment	$	432	$	294
Increase in capital accruals	12		54

Total capital expenditures	$	444	$	348

~~15.~~14. Commitments and Contingencies

MPLX is the subject of, or a party to, a number of pending or threatened legal actions, contingencies and commitments involving a variety of matters, including laws and regulations relating to the environment. Some of these matters are discussed below. For matters for which MPLX has not recorded a liability, MPLX is unable to estimate a range of possible loss because the issues involved have not been fully developed through pleadings, discovery or court proceedings. However, the ultimate resolution of some of these contingencies could, individually or in the aggregate, be material.

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Environmental Matters

MPLX is subject to federal, state and local laws and regulations relating to the environment. These laws generally provide for control of pollutants released into the environment and require responsible parties to undertake remediation of hazardous waste disposal sites. Penalties may be imposed for non-compliance.

~~At June 30, 2022 and December 31, 2021, accrued~~Accrued liabilities for remediation totaled ~~$27~~$17 million at both June 30, 2023 and ~~$23 million, respectively.~~December 31, 2022. It is not presently possible to estimate the ultimate amount of all remediation costs that might be incurred or the penalties, if any, that may be imposed.

MPLX is involved in environmental enforcement matters arising in the ordinary course of business. While the outcome and impact to MPLX cannot be predicted with certainty, management believes the resolution of these environmental matters will not, individually or collectively, have a material adverse effect on its consolidated results of operations, financial position or cash flows.

~~Guarantees~~Other Legal Proceedings

~~Over~~In July 2020, Tesoro High Plains Pipeline Company, LLC (“THPP”), a subsidiary of MPLX, received a Notification of Trespass Determination from the ~~years, MPLX has sold various assets~~Bureau of Indian Affairs (“BIA”) relating to a portion of the Tesoro High Plains Pipeline that crosses the Fort Berthold Reservation in North Dakota. The notification demanded the immediate cessation of pipeline operations and assessed trespass damages of approximately $187 million. After subsequent appeal proceedings and in compliance with a new order issued by the BIA, in December 2020, THPP paid approximately $4 million in assessed trespass damages and ceased use of the portion of the pipeline that crosses the property at issue. In March 2021, the BIA issued an order purporting to vacate the BIA's prior orders related to THPP’s alleged trespass and direct the Regional Director of the BIA to reconsider the issue of THPP’s alleged trespass and issue a new order. In April 2021, THPP filed a lawsuit in the ~~normal~~District of North Dakota against the United States of America, the U.S. Department of the Interior and the BIA (together, the “U.S. Government Parties”) challenging the March 2021 order purporting to vacate all previous orders related to THPP’s alleged trespass. On February 8, 2022, the U.S. Government Parties filed their answer and counterclaims to THPP’s suit claiming THPP is in continued trespass with respect to the pipeline and seek disgorgement of pipeline profits from June 1, 2013 to present, removal of the pipeline and remediation. We intend to vigorously defend ourselves against these counterclaims.

MPLX is also a party to a number of other lawsuits and other proceedings arising in the ordinary course of business. While the ultimate outcome and impact to MPLX cannot be predicted with certainty, management believes the resolution of these other lawsuits and proceedings will not, individually or collectively, have a material adverse effect on its ~~business. Certain~~consolidated financial position, results of ~~the~~operations or cash flows.

Guarantees related agreements contain performance and general guarantees, including guarantees regarding inaccuracies in representations, warranties, covenants and agreements, and environmental and general indemnifications that require MPLX to ~~perform upon the occurrence~~indebtedness of a triggering event or condition. These guarantees and indemnifications are part of the normal course of selling assets. MPLX is typically not able to calculate the maximum potential amount of future payments that could be made under such contractual provisions because of the variability inherent in the guarantees and indemnities. Most often, the nature of the guarantees and indemnities is such that there is no appropriateequity method ~~for quantifying the exposure because the underlying triggering event has little or no past experience upon which a reasonable prediction of the outcome can be based.~~investees

We hold a 9.19 percent indirect interest in a joint venture ~~(“Dakota Access”)~~ that owns and operates the Dakota Access Pipeline and Energy Transfer Crude Oil Pipeline projects, collectively referred to as the Bakken Pipeline system or DAPL. In 2020, the U.S. District Court for the District of Columbia (the “D.D.C.”) ordered the U.S. Army Corps of Engineers (“Army Corps”), which granted permits and an easement for the Bakken Pipeline system, to prepare an environmental impact statement (“EIS”) relating to an easement under Lake Oahe in North Dakota. The D.D.C. later vacated the easement. ~~Completion of the~~The EIS ~~may now be~~has been delayed asand the Army Corps ~~engages with the Standing Rock Sioux Tribe on the tribe’s reasons for withdrawing as~~currently expects to release a ~~cooperating agency with respect to preparation of the EIS.~~draft EIS in 2023.

In May 2021, the D.D.C. denied a renewed request for an injunction to shut down the pipeline while the EIS is being prepared. In June 2021, the D.D.C. issued an order dismissing without prejudice the tribes’ claims against the Dakota Access Pipeline. The litigation could be reopened or new litigation challenging the EIS, once completed, could be filed. The pipeline remains operational.

We have entered into a Contingent Equity Contribution Agreement whereby MPLX LP, along with the other joint venture owners in the Bakken Pipeline system, has agreed to make equity contributions to the joint venture upon certain events occurring to allow the entities that own and operate the Bakken Pipeline system to satisfy their senior note payment obligations. The senior notes were issued to repay amounts owed by the pipeline companies to fund the cost of construction of the Bakken Pipeline system.

If the pipeline were temporarily shut down, MPLX would have to contribute its 9.19 percent pro rata share of funds required to pay interest accruing on the notes and any portion of the principal that matures while the pipeline is shutdown. MPLX also expects to contribute its 9.19 percent pro rata share of any costs to remediate any deficiencies to reinstate the permit and/or return the pipeline into operation. If the vacatur of the easement permit results in a permanent shutdown of the pipeline, MPLX would have to contribute its 9.19 percent pro rata share of the cost to redeem the bonds (including the one percent redemption premium required pursuant to the indenture governing the notes) and any accrued and unpaid interest. As of June 30, ~~2022,~~2023, our maximum potential undiscounted payments under the Contingent Equity Contribution Agreement were approximately $170 million.

~~Other Legal Proceedings~~

In July 2020, Tesoro High Plains Pipeline Company, LLC (“THPP”), a subsidiary of MPLX, received a Notification of Trespass Determination from the Bureau of Indian Affairs (“BIA”) relating to a portion of the Tesoro High Plains Pipeline that crosses the Fort Berthold Reservation in North Dakota. The notification demanded the immediate cessation of pipeline operations and assessed trespass damages of approximately $187 million. On appeal, the Assistant Secretary - Indian Affairs issued an order vacating the BIA’s trespass order and remanded to the Regional Director for the BIA Great Plains Region to issue a new decision based on specific criteria. On December 15, 2020, the Regional Director of the BIA issued a new trespass notice to THPP, finding that THPP was in trespass and assessing trespass damages of approximately $4 million (including interest), which has been paid. The order also required that THPP immediately cease and desist use of the portion of the pipeline that crosses the property at issue. THPP has complied with the Regional Director’s December 15, 2020 notice. In March 2021, THPP received a copy of an order purporting to vacate all orders related to THPP’s alleged trespass issued by the BIA between July 2, 2020 and January 14, 2021. The order directs the Regional Director of the BIA to reconsider the issue of THPP’s alleged trespass and issue a new

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order, if necessary, after all interested parties have had an opportunity to be heard. Subsequently, landowners voluntarily dismissed the suit filed in the District of North Dakota. On April 23, 2021, THPP filed a lawsuit in the District of North Dakota against the United States of America, the U.S. Department of the Interior and the BIA (together, the “U.S. Government Parties”) challenging the March order purporting to vacate all previous orders related to THPP’s alleged trespass.

On February 8, 2022, the U.S. Government Parties filed their answer to THPP’s suit, asserting counterclaims for trespass and ejectment. The U.S. Government Parties claim THPP is in continued trespass with respect to the pipeline and seek disgorgement of pipeline profits from June 1, 2013 to present, removal of the pipeline and remediation. We intend to vigorously defend ourselves against these counterclaims. We continue to work towards a settlement of this matter with holders of the property rights at issue.

MPLX is also a party to a number of other lawsuits and other proceedings arising in the ordinary course of business. While the ultimate outcome and impact to MPLX cannot be predicted with certainty, management believes the resolution of these other lawsuits and proceedings will not, individually or collectively, have a material adverse effect on its consolidated financial position, results of operations or cash flows.

Contractual Commitments and Contingencies

From time to time and in the ordinary course of business, MPLX and its affiliates provide guarantees of MPLX’s subsidiaries payment and performance obligations in the G&P segment. Certain natural gas processing and gathering arrangements require MPLX to construct new natural gas processing plants, natural gas gathering pipelines and NGL pipelines and contain certain fees and charges if specified construction milestones are not achieved for reasons other than force majeure. In certain cases, certain producers may have the right to cancel the processing arrangements if there are significant delays that are not due to force majeure. As of June 30, ~~2022,~~2023, management does not believe there are any indications that MPLX will not be able to meet the construction milestones, that force majeure does not apply or that such fees and charges will otherwise be triggered.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

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.~~2022.

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,” “intend,” “may,” “objective,” “opportunity,” “outlook,” “plan,” “policy,” “position,” “potential,” “predict,” “priority,” “project,” “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~~plans and ~~targets,~~goals, including those related to greenhouse gas emissions, diversity and inclusion and ESG reporting;

•future levels of capital, environmental or maintenance expenditures, general and administrative and other expenses;

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

•business strategies, growth opportunities and expected investments;

•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.~~assumptions that we cannot predict. Forward-looking and other statements regarding our ESG plans and goals are not an indication that these statements are material to investors or required to be disclosed in our filings with the SEC. In addition, historical, current, and forward-looking ESG-related statements may be based on standards for measuring progress that are still developing, internal controls and processes that continue to evolve, and assumptions that are subject to change in the future. 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 and market disruptions;~~

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

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•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;

•changes in estimates or projections used to assess fair value of intangible assets, goodwill and property and equipment and/or strategic decisions or other developments with respect to our assets that cause impairment charges;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;~~products, or renewables;

•volatility in or degradation of general economic, market, industry or business conditions as a result of the COVID-19 pandemic, other infectious disease outbreaks, natural hazards, extreme weather events, the military conflict between Russia and ~~industry conditions;~~Ukraine, other conflicts, inflation, rising interest rates or otherwise;

•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;

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•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;

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

•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;~~products, or renewables;

•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;~~undercapacity;

•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, refined products, or ~~refined products; and~~renewables;

•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, other hydrocarbon-based products, or renewables;

•the imposition of windfall profit taxes or maximum refining margin penalties on companies operating in the energy industry in California or other ~~hydrocarbon-based products.~~jurisdictions; and

•our ability to successfully achieve our ESG goals and targets within the expected timeframe, if at all.

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.~~2022. We undertake no obligation to update any forward-looking ~~statement~~statements except to the extent required by applicable law.

MPLX Overview

We are a diversified, large-cap ~~MLP~~master limited partnership formed by MPC in 2012 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:

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Logistics and Storage (“L&S”), and Gathering and Processing (“G&P”). The L&S segment ~~is engaged~~primarily engages in the gathering, transportation, storage and distribution of crude oil, refined products, ~~and~~ other hydrocarbon-based ~~products.~~products, and renewables. 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~~gas as well as the transportation, fractionation, storage and marketing of NGLs.

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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 June 30, ~~2022~~2023 and June 30, ~~2021~~2022 are shown in the chart below. ~~See the Non-GAAP Financial Information section below for the definitions of Adjusted EBITDA and DCF and~~Refer to the Results of Operations, ~~section~~the Liquidity and Capital Resources, and Non-GAAP Financial Information sections for further ~~details regarding changes in these metrics.~~information.

(1) Non-GAAP measure. See reconciliations that follow for the most directly comparable GAAP measures.

Other Highlights

•~~Generated net cash provided by operating activities of $1,487~~Returned $799 million and ~~free cash flow after distributions of $614 million in the secondquarter of 2022.~~

•~~Announced a second quarter 2022 distribution of $0.7050 per common unit, resulting in a distribution coverage ratio of 1.69x for the second quarter.~~

•~~Returned $35 million and $135~~$1,620 million of ~~cash~~capital to unitholders in the three and six months ended June 30, ~~2022, respectively, through~~2023, in the ~~repurchase~~form of common units under our unit repurchase program. We repurchased 1,037,434 and 4,156,956 common units during the three and six months ended June 30, 2022, respectively. As of June 30, 2022, we had $202 million remaining under the existing unit repurchase authorization.distributions.

•~~On August 2, 2022, MPLX announced the board~~Announced a second quarter 2023 distribution of ~~directors approved an incremental $1 billion unit repurchase authorization. The authorization has no expiration date.~~

•~~Renewed transportation service contracts with MPC, which were set to expire in 2022, extending the term by 10 years.~~$0.7750 per common unit.

Current Economic Environment

~~Through the first six months of 2022, we continue~~In an effort to see recovery in the environment in which our business operates. The increase in global demand for refined products and global commodity supply constraints have contributed to improved throughputs and higher natural gas and NGL prices. We are unable to predict the potential effects that resurgences of COVID-19 or the continuance or escalation of the military conflict between Russia and Ukraine, and related sanctions, may have on our financial position and results. It remains uncertain how long these conditions may last or how severe they may become.

~~In 2022, data indicates a sharp rise in~~ease inflation in support of its monetary policy goals, the ~~U.S.~~Federal Reserve has raised interest rates multiple times throughout 2022 and globally. Current and future inflationary effects may be driven by, among other things, supply chain disruptions, governmental stimulus or fiscal policies and increasing demand for certain goods and services as recovery from the COVID-19 pandemic continues. We have observed higher costs for labor and materials used in our business.2023. We cannot predict the effect of higher interest rates, the concern of a recession, or the impact of inflation and fuel prices on demand for our ~~products and~~ services. In response to this business environment, MPLX remains focused on executing its strategic priorities of strict capital discipline, ~~embedding~~fostering a low-cost culture, and portfolio ~~optimizatio~~n.optimization. Also, to the extent permitted by regulations and our existing agreements, many of which provide for inflation-based adjustments, we have increased the fees we charge our customers to reflect higher levels of inflation.

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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, adjusted free cash flow (“Adjusted FCF”), and ~~free cash flow~~Adjusted FCF 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)~~provision for income taxes; ~~(iii)~~(ii) interest and other financial costs; (iii) depreciation and amortization; (iv) ~~impairment expense; (v) income~~income/(loss) from equity method investments; ~~(vi)~~(v) distributions and adjustments related to equity method investments; (vi) gain on sales-type leases; (vii) impairment expense; (viii) noncontrolling interests; and ~~(viii)~~(ix) other adjustments, as ~~deemed necessary.~~applicable. 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 Adjusted FCF as net cash provided by operating activities adjusted ~~for~~for: (i) net cash used in investing activities; (ii) cash contributions from MPC; ~~(iii) cash contributions from noncontrolling interests~~ and ~~(iv)~~(iii) cash distributions to noncontrolling interests. We define ~~free cash flow~~Adjusted FCF after distributions as Adjusted FCF less base distributions to common and preferred unitholders.

We believe that the presentation of Adjusted EBITDA, DCF, Adjusted FCF and ~~free cash flow~~Adjusted FCF 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

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most directly comparable to Adjusted FCF and ~~free cash flow~~Adjusted FCF 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.~~Operations. For a reconciliation of Adjusted FCF and ~~free cash flow~~Adjusted FCF after distributions to their most directly comparable measure calculated and presented in accordance with GAAP, see ~~the~~ Liquidity and Capital ~~resources section.~~Resources.

Comparability of our Financial Results

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 ASU No. 2016-02, Leases (“ASC ~~842,~~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~~summarize our results of operations, ~~for the three and six months ended June 30, 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. This discussion should be read in conjunction with Item 1. Financial Statements and is intended to provide investors with a reasonable basis for assessing our historical operations, but should not serve as the only criteria for predicting our future performance.


		Three Months Ended June 30,						Six Months Ended June 30,							Three Months Ended June 30,						Six Months Ended June 30,
(In millions)	(In millions)	2022		2021		Variance		2022		2021		Variance		(In millions)	2023		2022		Variance		2023		2022		Variance
Revenues and other income:	Revenues and other income:													Revenues and other income:

Total revenues and other income	Total revenues and other income	$	2,940	$	2,395	$	545	$	5,550	$	4,734	$	816	Total revenues and other income	$	2,690	$	2,940	$	(250)	$	5,403	$	5,550	$	(147)
Costs and expenses:	Costs and expenses:													Costs and expenses:
Cost of revenues (excludes items below)	Cost of revenues (excludes items below)	323		293		30		610		566		44		Cost of revenues (excludes items below)	348		323		25		656		610		46
Purchased product costs	Purchased product costs	663		338		325		1,130		614		516		Purchased product costs	354		663		(309)		760		1,130		(370)
Rental cost of sales	Rental cost of sales	42		32		10		79		64		15		Rental cost of sales	20		42		(22)		40		79		(39)
Rental cost of sales - related parties	Rental cost of sales - related parties	19		23		(4)		34		62		(28)		Rental cost of sales - related parties	9		19		(10)		16		34		(18)
Purchases - related parties	Purchases - related parties	351		297		54		670		595		75		Purchases - related parties	357		351		6		718		670		48
Depreciation and amortization	Depreciation and amortization	310		318		(8)		623		647		(24)		Depreciation and amortization	310		310		—		606		623		(17)
Impairment expense		��		42		(42)		—		42		(42)
General and administrative expenses	General and administrative expenses	82		87		(5)		160		173		(13)		General and administrative expenses	89		82		7		178		160		18

Other taxes	Other taxes	33		34		(1)		67		66		1		Other taxes	28		33		(5)		58		67		(9)
Total costs and expenses	Total costs and expenses	1,823		1,464		359		3,373		2,829		544		Total costs and expenses	1,515		1,823		(308)		3,032		3,373		(341)
Income from operations	Income from operations	1,117		931		186		2,177		1,905		272		Income from operations	1,175		1,117		58		2,371		2,177		194
Related party interest and other financial costs		1		2		(1)		5		2		3
Related-party interest and other financial costs														Related-party interest and other financial costs	—		1		(1)		—		5		(5)
Interest expense, net of amounts capitalized	Interest expense, net of amounts capitalized	212		195		17		410		393		17		Interest expense, net of amounts capitalized	226		212		14		450		410		40
Other financial costs	Other financial costs	20		19		1		40		46		(6)		Other financial costs	7		20		(13)		26		40		(14)
Income before income taxes	Income before income taxes	884		715		169		1,722		1,464		258		Income before income taxes	942		884		58		1,895		1,722		173
Provision for income taxes	Provision for income taxes	—		—		—		5		1		4		Provision for income taxes	—		—		—		1		5		(4)
Net income	Net income	884		715		169		1,717		1,463		254		Net income	942		884		58		1,894		1,717		177
Less: Net income attributable to noncontrolling interests	Less: Net income attributable to noncontrolling interests	9		9		—		17		18		(1)		Less: Net income attributable to noncontrolling interests	9		9		—		18		17		1

Net income attributable to MPLX LP	Net income attributable to MPLX LP	875		706		169		1,700		1,445		255		Net income attributable to MPLX LP	933		875		58		1,876		1,700		176

Adjusted EBITDA attributable to MPLX LP(1)	Adjusted EBITDA attributable to MPLX LP(1)	1,457		1,374		83		2,850		2,726		124		Adjusted EBITDA attributable to MPLX LP(1)	1,531		1,457		74		3,050		2,850		200

DCF attributable to GP and LP unitholders(1)		$	1,206	$	1,219	$	(13)	$	2,384	$	2,325	$	59

DCF attributable to MPLX(1)														DCF attributable to MPLX(1)	$	1,315	$	1,237	$	78	$	2,583	$	2,447	$	136

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

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		Three Months Ended June 30,						Six Months Ended June 30,							Three Months Ended June 30,						Six Months Ended June 30,
(In millions)	(In millions)	2022		2021		Variance		2022		2021		Variance		(In millions)	2023		2022		Variance		2023		2022		Variance
Reconciliation of Adjusted EBITDA attributable to MPLX LP and DCF attributable to GP and LP unitholders from Net income:	Reconciliation of Adjusted EBITDA attributable to MPLX LP and DCF attributable to GP and LP unitholders from Net income:													Reconciliation of Adjusted EBITDA attributable to MPLX LP and DCF attributable to GP and LP unitholders from Net income:
Net income	Net income	$	884	$	715	$	169	$	1,717	$	1,463	$	254	Net income	$	942	$	884	$	58	$	1,894	$	1,717	$	177
Provision for income taxes	Provision for income taxes	—		—		—		5		1		4		Provision for income taxes	—		—		—		1		5		(4)
Interest and other financial costs	Interest and other financial costs	233		216		17		455		441		14		Interest and other financial costs	233		233		—		476		455		21
Income from operations	Income from operations	1,117		931		186		2,177		1,905		272		Income from operations	1,175		1,117		58		2,371		2,177		194
Depreciation and amortization	Depreciation and amortization	310		318		(8)		623		647		(24)		Depreciation and amortization	310		310		—		606		623		(17)
Impairment expense		—		42		(42)		—		42		(42)
Income from equity method investments	Income from equity method investments	(111)		(66)		(45)		(210)		(136)		(74)		Income from equity method investments	(145)		(111)		(34)		(279)		(210)		(69)
Distributions/adjustments related to equity method investments	Distributions/adjustments related to equity method investments	152		121		31		284		242		42		Distributions/adjustments related to equity method investments	190		152		38		343		284		59

Other		(1)		38		(39)		(5)		46		(51)
Other(1)														Other(1)	11		(1)		12		29		(5)		34
Adjusted EBITDA	Adjusted EBITDA	1,467		1,384		83		2,869		2,746		123		Adjusted EBITDA	1,541		1,467		74		3,070		2,869		201
Adjusted EBITDA attributable to noncontrolling interests	Adjusted EBITDA attributable to noncontrolling interests	(10)		(10)		—		(19)		(20)		1		Adjusted EBITDA attributable to noncontrolling interests	(10)		(10)		—		(20)		(19)		(1)

Adjusted EBITDA attributable to MPLX LP	Adjusted EBITDA attributable to MPLX LP	1,457		1,374		83		2,850		2,726		124		Adjusted EBITDA attributable to MPLX LP	1,531		1,457		74		3,050		2,850		200
Deferred revenue impacts	Deferred revenue impacts	24		40		(16)		48		62		(14)		Deferred revenue impacts	28		24		4		40		48		(8)
Sales-type lease payments, net of income	Sales-type lease payments, net of income	5		54		(49)		10		54		(44)		Sales-type lease payments, net of income	2		5		(3)		6		10		(4)
Net interest and other financial costs(1)		(215)		(198)		(17)		(419)		(418)		(1)
Net interest and other financial costs(2)														Net interest and other financial costs(2)	(221)		(215)		(6)		(438)		(419)		(19)
Maintenance capital expenditures, net of reimbursements	Maintenance capital expenditures, net of reimbursements	(39)		(18)		(21)		(53)		(29)		(24)		Maintenance capital expenditures, net of reimbursements	(21)		(39)		18		(65)		(53)		(12)
Equity method investment capital expenditures paid out		(3)		(2)		(1)		(6)		(3)		(3)
Equity method investment maintenance capital expenditures paid out														Equity method investment maintenance capital expenditures paid out	(2)		(3)		1		(7)		(6)		(1)
Other	Other	8		—		8		17		(5)		22		Other	(2)		8		(10)		(3)		17		(20)

DCF		1,237		1,250		(13)		2,447		2,387		60
DCF attributable to MPLX LP														DCF attributable to MPLX LP	1,315		1,237		78		2,583		2,447		136
Preferred unit distributions	Preferred unit distributions	(31)		(31)		—		(63)		(62)		(1)		Preferred unit distributions	(23)		(31)		8		(51)		(63)		12
DCF attributable to GP and LP unitholders	DCF attributable to GP and LP unitholders	$	1,206	$	1,219	$	(13)	$	2,384	$	2,325	$	59	DCF attributable to GP and LP unitholders	$	1,292	$	1,206	$	86	$	2,532	$	2,384	$	148

(1) Includes unrealized derivative gain/(loss), non-cash equity-based compensation and other miscellaneous items.

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

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		Six Months Ended June 30,							Three Months Ended June 30,						Six Months Ended June 30,
(In millions)	(In millions)	2022		2021		Variance		(In millions)	2023		2022		Variance		2023		2022		Variance
Reconciliation of Adjusted EBITDA attributable to MPLX LP and DCF attributable to GP and LP unitholders from Net cash provided by operating activities:	Reconciliation of Adjusted EBITDA attributable to MPLX LP and DCF attributable to GP and LP unitholders from Net cash provided by operating activities:							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	Net cash provided by operating activities	$	2,612	$	2,489	$	123	Net cash provided by operating activities	$	1,437	$	1,487	$	(50)	$	2,664	$	2,612	$	52
Changes in working capital items	Changes in working capital items	(148)		(131)		(17)		Changes in working capital items	(160)		(266)		106		(112)		(148)		36
All other, net	All other, net	(36)		(29)		(7)		All other, net	6		9		(3)		(3)		(36)		33
Gain on extinguishment of debt		—		(12)		12
Loss on extinguishment of debt								Loss on extinguishment of debt	—		—		—		9		—		9
Net interest and other financial costs(1)	Net interest and other financial costs(1)	419		418		1		Net interest and other financial costs(1)	221		215		6		438		419		19

Other adjustments to equity method investment distributions	Other adjustments to equity method investment distributions	26		3		23		Other adjustments to equity method investment distributions	(1)		14		(15)		12		26		(14)
Other	Other	(4)		8		(12)		Other	38		8		30		62		(4)		66
Adjusted EBITDA	Adjusted EBITDA	2,869		2,746		123		Adjusted EBITDA	1,541		1,467		74		3,070		2,869		201
Adjusted EBITDA attributable to noncontrolling interests	Adjusted EBITDA attributable to noncontrolling interests	(19)		(20)		1		Adjusted EBITDA attributable to noncontrolling interests	(10)		(10)		—		(20)		(19)		(1)

Adjusted EBITDA attributable to MPLX LP	Adjusted EBITDA attributable to MPLX LP	2,850		2,726		124		Adjusted EBITDA attributable to MPLX LP	1,531		1,457		74		3,050		2,850		200
Deferred revenue impacts	Deferred revenue impacts	48		62		(14)		Deferred revenue impacts	28		24		4		40		48		(8)
Sales-type lease payments, net of income~~(2)~~	Sales-type lease payments, net of income~~(2)~~	10		54		(44)		Sales-type lease payments, net of income~~(2)~~	2		5		(3)		6		10		(4)
Net interest and other financial costs(1)	Net interest and other financial costs(1)	(419)		(418)		(1)		Net interest and other financial costs(1)	(221)		(215)		(6)		(438)		(419)		(19)
Maintenance capital expenditures, net of reimbursements	Maintenance capital expenditures, net of reimbursements	(53)		(29)		(24)		Maintenance capital expenditures, net of reimbursements	(21)		(39)		18		(65)		(53)		(12)
Equity method investment capital expenditures paid out		(6)		(3)		(3)

Equity method investment maintenance capital expenditures paid out								Equity method investment maintenance capital expenditures paid out	(2)		(3)		1		(7)		(6)		(1)
Other	Other	17		(5)		22		Other	(2)		8		(10)		(3)		17		(20)

DCF		2,447		2,387		60
DCF attributable to MPLX LP								DCF attributable to MPLX LP	1,315		1,237		78		2,583		2,447		136
Preferred unit distributions	Preferred unit distributions	(63)		(62)		(1)		Preferred unit distributions	(23)		(31)		8		(51)		(63)		12
DCF attributable to GP and LP unitholders	DCF attributable to GP and LP unitholders	$	2,384	$	2,325	$	59	DCF attributable to GP and LP unitholders	$	1,292	$	1,206	$	86	$	2,532	$	2,384	$	148

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

~~(2) The six months ended June 30, 2021 includes one-time impact from Refining Logistics harmonization project of $54 million.~~

Three months ended June 30, ~~2022~~2023 compared to three months ended June 30, ~~2021~~2022

Total revenues and other income ~~increased $545~~decreased $250 million in the second quarter of ~~2022~~2023 compared to the same period of ~~2021. This~~2022. The decrease was driven by lower product sales revenue as a result of lower NGL prices during the second quarter of 2023 as compared to the same period of 2022. The decrease was partially offset by higher throughput and rate escalations across the business and a $34 million increase in income from equity method investments primarily due to higher prices and volumes in most regions in the G&P segment of approximately $466 million. There were also increased revenue from terminal activities and fee escalations, as well as higher income from equity method investments.throughput.

Cost of revenues increased ~~$30~~$25 million and rental cost of sales (including related party) decreased $32 million in the second quarter of ~~2022~~2023 compared to the same period of ~~2021. This was primarily due~~2022. These offsetting variances reflect the modification of a gathering and compression agreement in the third quarter of 2022 (“Third-Party Lease Modification”) which resulted in a change in the presentation of expenses from rental cost of sales to ~~higher spending driven by the timing~~cost of ~~expense projects and higher operating costs.~~revenues.

Purchased product costs ~~increased $325~~decreased $309 million in the second quarter of ~~2022~~2023 compared to the same period of ~~2021~~2022. This was primarily due to ~~higher~~lower NGL prices of ~~$287~~$393 million, ~~in the Southwest and Southern Appalachia and higher volumes in the Southwest,~~ partially offset by ~~a decrease~~higher volumes of ~~$43 million due to changes in the fair value of our embedded derivative.~~$90 million.

~~Rental cost~~Interest expense, net of ~~sales and rental cost of sales - related parties~~amounts capitalized increased $6$14 million in the second quarter of ~~2022~~2023 compared to the same period of ~~2021.~~2022. This was primarily due to refinancing maturing debt with fixed rate debt at higher ~~operating costs~~interest rates in 2022 and ~~repairs and maintenance costs~~2023 in addition to taking on incremental debt in order to finance the redemption of the Series B preferred units in the ~~Marcellus and to modifications to lease contracts which resulted in a greater portion~~first quarter of 2023. Other financial costs ~~being recorded to purchases - related parties, as noted below.~~

~~Purchases - related parties increased $54 million in~~also benefited from higher interest earned during the second quarter of 2023. Refer to the Liquidity and Capital Resources section for further information.

Six months ended June 30, 2023 compared to six months ended June 30, 2022

Total revenues and other income decreased $147 million in the first sixmonths of 2023 compared to the same period of ~~2021. This~~2022. The decrease was driven by lower product sales revenue as a result of lower NGL prices during the first six months of 2023 as compared to the same period of 2022. The decrease was partially offset by higher throughput and rate escalations across the business and a $69 million increase in income from equity method investments primarily due to modifications to lease contracts which resulted in a greater portion of costs now being recorded to purchases - related parties as opposed to rental cost of sales - related parties costs, as noted above, as well as to increased transportation, employee, and project-related costs.higher throughput.

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~~Six~~ Cost of revenues increased $46 million and rental cost of sales (including related party) decreased $57 million in the first sixmonths ~~ended June 30, 2022~~of 2023 compared to ~~six months endedJune 30, 2021~~the same period of 2022. These offsetting variances reflect the modification of a gathering and compression agreement in the third quarter of 2022 (“Third-Party Lease Modification”) which resulted in a change in the presentation of expenses from rental cost of sales to cost of revenues.

~~Total revenues and other income increased $816~~Purchased product costs decreased $370 million in the first six months of ~~2022~~2023 compared to the same period of ~~2021.~~2022. This was primarily due to lower NGL prices of $550 million, partially offset by higher volumes of $172 million.

Purchases - related parties increased $48 million in the first six months of 2023 compared to the same period of 2022. This was primarily due to higher ~~prices~~related-party purchased product costs and ~~volumes in most regions~~higher transportation costs.

Depreciation and amortization decreased $17 million in the ~~G&P segment~~first sixmonths of ~~approximately $697 million. There were also increased pipeline fees~~2023 compared to the same period of 2022. This was primarily due to lower depreciation as a result of the derecognition of fixed assets in connection with the Third-Party Lease Modification in the ~~L&S segment due to higher pipeline throughput outweighing decreased average tariff rates, increased revenue from terminal activities, increased revenue from the recognition~~third quarter of ~~volume deficiency credits, as well as a $74 million increase in income from equity method investments. These increases were~~2022. This decrease was partially offset by ~~a loss~~depreciation on ~~disposal~~new assets placed in service after the second quarter of 2022 and accelerated depreciation related to idled assets.

~~Cost~~General and administrative expenses increased $18 million in the first sixmonths of ~~revenues~~2023 compared to the same period of 2022 due to increased ~~$44~~costs from MPC, primarily higher employee costs.

Interest expense, net of amounts capitalized increased $40 million in the first six months of ~~2022~~2023 compared to the same period of ~~2021.~~2022. This was primarily due to ~~increased operating costs driven by~~refinancing debt with fixed rate debt at higher interest rates in 2022 and 2023 in addition to taking on incremental debt in order to finance the ~~timing~~redemption of ~~expense projects and higher environmental response and remediation costs. Additionally, higher repairs and maintenance costs in~~ the ~~Marcellus and Rockies were partially offset by lower costs in the Southwest.~~

~~Purchased product costs increased $516 million~~Series B preferred units in the first ~~six months~~quarter of ~~2022 compared~~2023. Other financial costs also benefited from higher interest earned during 2023. Refer to the ~~same period of 2021. This was primarily due to higher prices of $430 million in the Southwest~~Liquidity and ~~Southern Appalachia and higher volumes in the Southwest, partially offset by a decrease of $55 million due to changes in the fair value of our embedded derivative.~~

Rental cost of sales and rental cost of sales - related parties decreased $13 million in the first six months 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. The decreases were partially offset by increased miscellaneous expenses as well as higher operating costs and repairs and maintenance costs in the Marcellus.

Purchases - related parties increased $75 million in the first six months 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. There were also increased transportation costs and other miscellaneous increases. These increases were partially offset by decreased employee-related costs from MPC.

Depreciation and amortization decreased $24 million in the first six months of 2022 compared to the same period of 2021. This was primarily due to the prior year derecognition of fixed assets resulting from the modification of certain lease contracts and accelerated depreciation on refining logistics assets at MPC’s idled Gallup refinery.

Capital Resources section for further information.

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Segment Results

We classify our business in the following reportable segments: L&S and G&P. We evaluate the performance of our segments using Segment Adjusted EBITDA. 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)~~(iv) distributions and adjustments related to equity method investments; (v) gain on sales-type leases; (vi) impairment expense; (vii) noncontrolling interests; and ~~(vii)~~(viii) other adjustments, as ~~deemed necessary.~~applicable. These items are either: (i) believed to be non-recurring in nature; (ii) not believed to be allocable or controlled by the segment; or (iii) are not tied to the operational performance of the segment.

The tables below present information about Segment Adjusted EBITDA for the reported segments for the three and six months ended June 30, ~~2022~~2023 and ~~2021.~~June 30, 2022.

L&S Segment

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


		Three Months Ended June 30,						Six Months Ended June 30,							Three Months Ended June 30,						Six Months Ended June 30,
(In millions)	(In millions)	2022		2021		Variance		2022		2021		Variance		(In millions)	2023		2022		Variance		2023		2022		Variance
Service revenue	Service revenue	$	1,010	$	992	$	18	$	1,993	$	1,945	$	48	Service revenue	$	1,060	$	1,010	$	50	$	2,093	$	1,993	$	100
Rental income	Rental income	208		176		32		383		425		(42)		Rental income	210		208		2		422		383		39
Product related revenue	Product related revenue	7		4		3		11		8		3		Product related revenue	3		7		(4)		8		11		(3)
Sales-type lease revenue	Sales-type lease revenue	114		136		(22)		225		173		52		Sales-type lease revenue	125		114		11		250		225		25
Income from equity method investments	Income from equity method investments	59		35		24		111		71		40		Income from equity method investments	82		59		23		153		111		42
Other income	Other income	22		16		6		34		31		3		Other income	18		22		(4)		32		34		(2)
Total segment revenues and other income	Total segment revenues and other income	1,420		1,359		61		2,757		2,653		104		Total segment revenues and other income	1,498		1,420		78		2,958		2,757		201
Cost of revenues	Cost of revenues	159		143		16		300		287		13		Cost of revenues	158		159		(1)		293		300		(7)
Purchases - related parties	Purchases - related parties	258		228		30		497		443		54		Purchases - related parties	263		258		5		507		497		10
Depreciation and amortization	Depreciation and amortization	129		136		(7)		259		283		(24)		Depreciation and amortization	140		129		11		269		259		10
General and administrative expenses	General and administrative expenses	43		46		(3)		86		92		(6)		General and administrative expenses	51		43		8		100		86		14

Other taxes	Other taxes	20		19		1		41		38		3		Other taxes	20		20		—		39		41		(2)
Segment income from operations		811		787		24		1,574		1,510		64
Depreciation and amortization		129		136		(7)		259		283		(24)
Income from equity method investments		(59)		(35)		(24)		(111)		(71)		(40)
Distributions/adjustments related to equity method investments		79		58		21		137		116		21
Total costs and expenses														Total costs and expenses	632		609		23		1,208		1,183		25

Other		6		1		5		11		5		6

Segment adjusted EBITDA(1)		966		947		19		1,870		1,843		27

Segment Adjusted EBITDA														Segment Adjusted EBITDA	1,022		966		56		2,048		1,870		178
Capital expenditures	Capital expenditures	81		76		5		158		135		23		Capital expenditures	110		81		29		178		158		20
Investments in unconsolidated affiliates(2)		$	10	$	13	$	(3)	$	78	$	22	$	56
Investments in unconsolidated affiliates(1)														Investments in unconsolidated affiliates(1)	$	1	$	10	$	(9)	$	16	$	78	$	(62)

(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 six months ended June 30, 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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Three months ended June 30, ~~2022~~2023 compared to three months ended June 30, ~~2021~~2022

Service revenue increased ~~$18~~$50 million in the second quarter of ~~2022~~2023 compared to the same period of ~~2021.~~2022. This was primarily driven by higher ~~revenue recognized~~pipeline tariff rates, increased pipeline throughput, and $12 million from ~~increased revenue from terminal activities and annual~~refining logistics fee escalations. ~~These increases were~~The increase was partially offset by a ~~net decrease in pipeline transportation fees due to lower tariff rates outweighing higher throughput volumes as well as a net~~ decrease of ~~$15 million from changes in the presentation of revenue between service revenue, rental income and sales-type lease revenue driven by modifications to agreements with MPC.~~

Rental income increased $32 million in the second quarter of 2022 compared to the same period of 2021. This was primarily due to a net increase of $36 million from changes in the presentation of revenue between service revenue, rental income and sales-type lease revenue driven by modifications to agreements with MPC. Annual fee escalations also contributed to the increase.

~~Sales-type lease revenue - related parties decreased $22 million in the second quarter of 2022 compared to the same period of 2021. This was primarily due to a decrease of $21~~$8 million from changes in the presentation of revenue between service revenue, rental income and sales-type lease revenue as a result of modifications to agreements with MPC.

~~Income from equity methods investments~~Sales-type lease revenue increased ~~$24~~$11 million in the second quarter of ~~2022~~2023 compared to the same period of ~~2021.~~2022. This was primarily due to an increase of $7 million from changes in the presentation of revenue between service revenue, rental income

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and sales-type lease revenue as a result of modifications to agreements with MPC, as well as from $3 million from refining logistics due to fee escalations.

Income from equity method investments increased $23 million in the second quarter of 2023 compared to the same period of 2022. This was primarily driven by increased throughput on equity method investment pipeline ~~systems, including the Whistler pipeline which was placed into service in the third quarter of 2021.~~systems.

Cost of revenues increased $16 million in the second quarter of 2022 compared to the same period of 2021. This was primarily due to higher project-related costs. The increases were partially offset by modifications to lease contracts which resulted in a greater portion of costs being recorded to purchases - related parties, as noted below.

Purchases - related parties increased $30 million in the second quarter of 2022 compared to the same period of 2021. This was primarily due to modifications to lease contracts which resulted in a greater portion of 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, as well as to increased project-related costs.

Six months ended June 30, ~~2022~~2023 compared to six months endedJune 30, ~~2021~~2022

Service revenue increased ~~$48~~$100 million in the first six months of ~~2022~~2023 compared to the same period of ~~2021.~~2022. This was primarily ~~due~~driven by higher pipeline tariff rates, increased pipelinethroughput,and $17 million from refining logistics fee escalations. These increases were partially offset by a decrease of $39 million from changes in the presentation of revenue between service revenue, rental income and sales-type lease revenue driven by modifications to increased revenue from terminal activities, annual fee escalations, and higher revenue recognized from volume deficiency credits. Additionally, there was a net increase in pipeline fees due to increased throughput outweighing lower average tariff rates.agreements with MPC.

Rental income ~~decreased $42~~increased $39 million in the first six months of ~~2022~~2023 compared to the same period of ~~2021.~~2022. This was primarily due to ~~a net decrease~~an increase of ~~$52~~$21 million from changes in the presentation of revenue between service revenue, rental income and sales-type lease ~~income~~revenue driven by modifications to agreements with MPC. There was also increased revenue of $13 million from refining logistics primarily due to fee escalations.

Sales-type lease revenue increased $25 million in the first six months of 2023 compared to the same period of 2022. This was primarily due to an increase of $18 million from changes in the presentation of revenue between service revenue, rental income and sales-type lease revenue as a result of modifications to ~~lease contracts. The decrease was partially offset by increased storage fees and~~agreements with MPC, as well as an increase of $7 million from refining logistics due to fee escalations.

~~Sales-type lease revenue - related parties~~Income from equity method investments increased ~~$52~~$42 million in the first six months of ~~2022~~2023 compared to the same period of ~~2021.~~2022. This was primarily ~~due to an increase of $52 million from changes in the presentation of lease income between service revenue, rental income and sales-type lease revenue~~ driven by ~~modifications of lease contracts.~~increased throughput on equity method investment pipeline systems.

~~Income from equity methods investments~~General and administrative expenses increased ~~$40~~$14 million in the first six months of ~~2022~~2023 compared to the same period of ~~2021. This was primarily~~2022, 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 increased $13 million in the first six months of 2022 compared to the same period of 2021. This was primarily due to higher project-related costs and higher environmental response and remediation costs compared to the first half of 2021. The increases were partially offset by modifications to lease contracts which resulted in costs being recorded to purchases - related parties, as noted below.

Purchases - related parties increased $54 million in the first six months 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 as well as increased project-related costs, were partially offset by decreased employee-related costs from ~~MPC.~~

~~Depreciation and amortization decreased $24 million in the first six months of 2022 compared to the same period of 2021. This was~~MPC, 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.~~higher employee costs.

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L&S Operating Data


		Three Months Ended June 30,				Six Months Ended June 30,					Three Months Ended June 30,				Six Months Ended June 30,
		2022		2021		2022		2021			2023		2022		2023		2022
L&S	L&S									L&S
Pipeline throughput (mbpd)	Pipeline throughput (mbpd)									Pipeline throughput (mbpd)
Crude oil pipelines	Crude oil pipelines	3,674		3,475		3,527		3,379		Crude oil pipelines	3,834		3,674		3,739		3,527
Product pipelines	Product pipelines	2,247		2,103		2,103		1,981		Product pipelines	2,118		2,247		2,053		2,103
Total pipelines	Total pipelines	5,921		5,578		5,630		5,360		Total pipelines	5,952		5,921		5,792		5,630

Average tariff rates ($ per barrel)(1)	Average tariff rates ($ per barrel)(1)									Average tariff rates ($ per barrel)(1)
Crude oil pipelines	Crude oil pipelines	$	0.86	$	0.95	$	0.89	$	0.95	Crude oil pipelines	$	0.93	$	0.86	$	0.93	$	0.89
Product pipelines	Product pipelines	0.77		0.77		0.80		0.78		Product pipelines	0.81		0.77		0.83		0.80
Total pipelines	Total pipelines	$	0.82	$	0.88	$	0.85	$	0.89	Total pipelines	$	0.89	$	0.82	$	0.89	$	0.85

Terminal throughput (mbpd)	Terminal throughput (mbpd)	3,101		2,986		3,021		2,801		Terminal throughput (mbpd)	3,180		3,101		3,136		3,021

Marine Assets (number in operation)(2)	Marine Assets (number in operation)(2)									Marine Assets (number in operation)(2)
Barges	Barges	296		299		296		299		Barges	307		296		307		296
Towboats	Towboats	23		23		23		23		Towboats	27		23		27		23

(1) Average tariff rates calculated using pipeline transportation revenues divided by pipeline throughput barrels. Transportation revenues include tariff and other fees, which may vary by region and nature of services provided.

(2) Represents total at end of period.

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G&P Segment

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

Three Months Ended June 30, Six Months Ended June 30,
(In millions) 2022 2021 Variance 2022 2021 Variance
Service revenue $ 505 $ 493 $ 12 $ 991 $ 1,001 $ (10)
Rental income 92 91 1 173 183 (10)
Product related revenue 860 407 453 1,521 804 717
Income from equity method investments 52 31 21 99 65 34
Other income 11 14 (3) 9 28 (19)
Total segment revenues and other income 1,520 1,036 484 2,793 2,081 712
Cost of revenues 225 205 20 423 405 18
Purchased product costs 663 338 325 1,130 614 516
Purchases - related parties 93 69 24 173 152 21
Depreciation and amortization 181 182 (1) 364 364 —
Impairment expense — 42 (42) — 42 (42)
General and administrative expenses 39 41 (2) 74 81 (7)
Other taxes 13 15 (2) 26 28 (2)
Segment income from operations 306 144 162 603 395 208
Depreciation and amortization 181 182 (1) 364 364 —
Impairment expense — 42 (42) — 42 (42)
Income from equity method investments (52) (31) (21) (99) (65) (34)
Distributions/adjustments related to equity method investments 73 63 10 147 126 21
Other (7) 37 (44) (16) 41 (57)
Adjusted EBITDA attributable to noncontrolling interests (10) (10) — (19) (20) 1
Segment Adjusted EBITDA(1)
491 427 64 980 883 97
Capital expenditures 95 36 59 190 66 124
Investments in unconsolidated affiliates $ 36 $ 36 $ — $ 78 $ 62 $ 16


	Three Months Ended June 30,						Six Months Ended June 30,
(In millions)	2023		2022		Variance		2023		2022		Variance
Service revenue	$	546	$	505	$	41	$	1,071	$	991	$	80
Rental income	52		92		(40)		103		173		(70)
Product related revenue	467		860		(393)		1,031		1,521		(490)
Sales-type lease revenue	33		—		33		67		—		67
Income from equity method investments	63		52		11		126		99		27
Other income	31		11		20		47		9		38
Total segment revenues and other income	1,192		1,520		(328)		2,445		2,793		(348)
Cost of revenues	219		225		(6)		419		423		(4)
Purchased product costs	354		663		(309)		760		1,130		(370)
Purchases - related parties	94		93		1		211		173		38
Depreciation and amortization	170		181		(11)		337		364		(27)
General and administrative expenses	38		39		(1)		78		74		4
Other taxes	8		13		(5)		19		26		(7)
Total costs and expenses	883		1,214		(331)		1,824		2,190		(366)









Segment Adjusted EBITDA	509		491		18		1,002		980		22
Capital expenditures	143		95		48		266		190		76
Investments in unconsolidated affiliates	$	25	$	36	$	(11)	$	61	$	78	$	(17)

Three months ended June 30, ~~2022~~2023 compared to three months ended June 30, ~~2021~~2022

Service revenue increased ~~$12~~$41 million in the second quarter of ~~2022~~2023 compared to the same period of ~~2021.~~2022. This was primarily due to higher ~~fees from~~volumes and higher ~~volumes in the Southwest, an increase due to a 2021 contract modification~~throughput fee rates in the Marcellus ~~resulting in a change in the presentation of the related income from rental income to service revenue.~~and Rockies.

~~Table of Contents~~

~~Product related~~Rental income decreased $40 million and sales-type lease revenue increased ~~$453~~$33 million in the second quarter of ~~2022~~2023 compared to the same period of ~~2021.~~2022. This was primarily due to ~~higher prices~~changes in the ~~Southwest, Marcellus,~~presentation of revenue between rental income and sales-type lease revenue as a result of the Third-Party Lease Modification in the third quarter of 2022 of $33 million. In addition, a contract modification decreased the amount of revenue allocated to Rental income in Southern Appalachia ~~and Bakken~~beginning in the first quarter of ~~approximately $333~~2023.

Product related revenue decreased $393 million ~~and~~in the second quarter of 2023 compared to the same period of 2022. This was primarily due to lower NGL prices across all regions of $450 million, partially offset by higher volumes in the Southwest ~~Rockies, Bakken and Marcellus~~ of ~~$121~~$49 million.

Income from equity method investments increased ~~$21~~$11 million in the second quarter of ~~2022~~2023 compared to the same period of ~~2021,~~2022. This was primarily due to ~~an impairment recorded in the second quarter of 2021 and~~ higher volumes associated with several of our joint ventures in the Marcellus and Utica. Additionally, our joint venture in the Southwest ~~and Utica regions.~~region added processing capacity in the fourth quarter of 2022 driving higher volumes over the prior period.

~~Cost~~

Table of ~~revenues~~Contents

Other income increased $20 million in the second quarter of ~~2022~~2023 compared to the same period of ~~2021.~~2022 due primarily to a gain on disposal of assets recognized in the second quarter of 2023 of $13 million in addition to a loss on disposal of assets of $4 million recognized in the second quarter of 2022.

Cost of revenues decreased $6 million in the second quarter of 2023 compared to the same period of 2022. This ~~increase~~decrease is attributable to ~~higher~~lower operating costs and repairs and maintenance costs in the ~~Marcellus and Rockies.~~Rockies of $14 million, partially offset by higher operating costs in the Southwest of $8 million.

Purchased product costs ~~increased $325~~decreased $309 million in the second quarter of ~~2022~~2023 compared to the same period of ~~2021.~~2022. This was primarily due to ~~higher~~lower NGL prices of ~~$287~~$393 million in the Southwest and Southern Appalachia, ~~and~~partially offset by higher volumes in the Southwest ~~partially offset by a decrease~~ of ~~$43 million due to changes in the fair value of our embedded derivative.~~

Purchases - related parties increased $24 million in the second quarter of 2022 compared to the same period of 2021. This was primarily due to an increase in transportation costs to related parties and an increase in employee related costs with related parties.

~~Impairment expense decreased $42 million in the second quarter of 2022 compared to the same period of 2021 due to impairments recorded in the second quarter of 2021.~~$90 million.

Six months ended June 30, ~~2022~~2023 compared to six months ended June 30, ~~2021~~2022

Service revenue ~~decreased $10~~increased $80 million in the first six months of ~~2022~~2023 compared to the same period of ~~2021.~~2022. This was primarily due to ~~a decrease in revenue related to cost reimbursements in the Rockies,~~higher volumes, higher throughput fee rates and ~~lower fees from lower volumes~~higher minimum volume commitments in the Marcellus ~~partially offset by an increase 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,~~ and ~~higher fees from higher volumes in the Southwest.~~Rockies.

Rental income decreased ~~$10~~$70 million and sales-type lease revenue increased $67 million in the first six months of ~~2022~~2023 compared to the same period of ~~2021.~~2022. This was primarily due to ~~a 2021 contract modification in the Marcellus resulting in a change~~changes in the presentation of ~~the related income from~~revenue between rental income ~~to service~~and sales-type lease revenue ~~partially offset by an increase in cost reimbursement revenue~~as a result of the Third-Party Lease Modification in the ~~Marcellus and Southern Appalachia.~~third quarter of 2022.

Product related revenue ~~increased $717~~decreased $490 million in the first six months of ~~2022~~2023 compared to the same period of ~~2021.~~2022. This was primarily due to ~~higher~~lower prices ~~in the Southwest, Marcellus, Southern Appalachia and Bakken~~across all regions of ~~approximately $520~~$648 million, ~~and higher fees from~~partially offset by higher volumes in the Southwest ~~Rockies, Bakken~~of $147 million and ~~Marcellus~~changes in the fair value of ~~$208~~our propane contracts of $10 million.

Income from equity method investments increased ~~$34~~$27 million in the first six months of ~~2022~~2023 compared to the same period of ~~2021,~~2022. This was primarily due to higher volumes ~~and rates~~ associated with several of our joint ventures in the ~~Utica,~~ Marcellus and ~~Southwest regions and an impairment recorded~~Utica. Additionally, our joint venture in the ~~second~~Southwest region added processing capacity in the fourth quarter of ~~2021.~~2022 driving higher volumes over the prior period.

Other income ~~decreased $19~~increased $38 million in the first six months of ~~2022~~2023 compared to the same period of ~~2021~~2022 due primarily to a gain on disposal of assets recognized in the second quarter of 2023 of $13 million in addition to a loss on disposal of ~~assets.~~assets of $22 million recognized in the first half of 2022.

~~Cost of revenues increased $18~~Purchased product costs decreased $370 million in the first six months of ~~2022~~2023 compared to the same period of ~~2021. This increase is attributable to higher operating costs and repairs and maintenance costs in the Marcellus and Rockies, partially offset by lower costs in the Southwest.~~

~~Purchased product costs increased $516 million in the first six months of 2022 compared to the same period of 2021.~~2022. This was primarily due to ~~higher~~lower NGL prices of ~~$430~~$550 million in the Southwest and Southern Appalachia, ~~and~~partially offset by higher volumes in the Southwest ~~partially offset by a decrease~~ of ~~$55 million due to changes in the fair value of our embedded derivative.~~$172 million.

Purchases - related parties increased ~~$21~~$38 million in the first six months of ~~2022~~2023 compared to the same period of ~~2021, this was primarily due~~2022. The increase is attributable to ~~an increase~~higher volumes and pricing on associated related-party purchased product costs in the Rockies and higher transportation costs ~~to related parties and an increase~~from increased throughput in ~~employee related costs with related parties.~~the Southwest.

~~Impairment expense~~Depreciation and amortization decreased ~~$42~~$27 million in the first six months of ~~2022~~2023 compared to the same period of ~~2021~~2022. This was primarily due to ~~impairments recorded~~lower depreciation as a result of the derecognition of fixed assets in connection with the Third-Party Lease Modification in the third quarter of 2022. This decrease was partially offset by depreciation on new assets placed in service after the second quarter of ~~2021.~~2022.

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G&P Operating Data

(1) Other includes Southern Appalachia, Bakken and Rockies Operations.

Three Months Ended
June 30, 2022 Three Months Ended
June 30, 2021
MPLX LP(1)
MPLX LP Operated(2)
MPLX LP(1)
MPLX LP Operated(2)
G&P
Gathering Throughput (MMcf/d)
Marcellus Operations 1,287 1,287 1,300 1,300
Utica Operations — 1,943 — 1,531
Southwest Operations 1,429 1,694 1,356 1,496
Bakken Operations 148 148 155 155
Rockies Operations 425 554 442 595
Total gathering throughput 3,289 5,626 3,253 5,077
Natural Gas Processed (MMcf/d)
Marcellus Operations 3,987 5,445 4,155 5,605
Utica Operations — 522 — 499
Southwest Operations 1,401 1,696 1,326 1,461
Southern Appalachian Operations 231 231 224 224
Bakken Operations 142 142 154 154
Rockies Operations 440 440 429 429
Total natural gas processed 6,201 8,476 6,288 8,372
C2 + NGLs Fractionated (mbpd)
Marcellus Operations(3)
471 471 477 477
Utica Operations(3)
— 30 — 27
Southwest Operations — — — —
Southern Appalachian Operations 12 12 12 12
Bakken Operations 20 20 25 25
Rockies Operations 3 3 4 4
Total C2 + NGLs fractionated(4)
506 536 518 545


	MPLX LP(1)		MPLX LP Operated(2)
	Three Months Ended June 30,		Three Months Ended June 30,
	2023	2022	2023	2022
G&P
Gathering Throughput (MMcf/d)
Marcellus Operations	1,321	1,287	1,321	1,287
Utica Operations	—	—	2,326	1,943
Southwest Operations	1,354	1,429	1,768	1,694
Bakken Operations	160	148	160	148
Rockies Operations	457	425	584	554
Total gathering throughput	3,292	3,289	6,159	5,626

Natural Gas Processed (MMcf/d)
Marcellus Operations	4,091	3,987	5,691	5,445
Utica Operations	—	—	547	522
Southwest Operations	1,517	1,449	1,848	1,638
Southern Appalachian Operations	219	231	219	231
Bakken Operations	159	142	159	142
Rockies Operations	470	440	470	440
Total natural gas processed	6,456	6,249	8,934	8,418

C2 + NGLs Fractionated (mbpd)
Marcellus Operations(3)	520	471	520	471
Utica Operations(3)	—	—	30	30
Southern Appalachian Operations	11	12	11	12
Bakken Operations	18	20	18	20
Rockies Operations	4	3	4	3
Total C2 + NGLs fractionated(4)	553	506	583	536

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							MPLX LP(1)		MPLX LP Operated(2)
		Six Months Ended June 30, 2022		Six Months Ended June 30, 2021			Six Months Ended June 30,		Six Months Ended June 30,
		MPLX LP(1)	MPLX LP Operated(2)	MPLX LP(1)	MPLX LP Operated(2)		2023	2022	2023	2022
G&P	G&P					G&P
Gathering Throughput (MMcf/d)	Gathering Throughput (MMcf/d)					Gathering Throughput (MMcf/d)
Marcellus Operations	Marcellus Operations	1,300	1,300	1,299	1,299	Marcellus Operations	1,342	1,300	1,342	1,300
Utica Operations	Utica Operations	—	1,879	—	1,549	Utica Operations	—	—	2,393	1,879
Southwest Operations	Southwest Operations	1,369	1,586	1,364	1,472	Southwest Operations	1,367	1,369	1,792	1,586
Bakken Operations	Bakken Operations	147	147	150	150	Bakken Operations	158	147	158	147
Rockies Operations	Rockies Operations	410	540	457	611	Rockies Operations	450	410	574	540
Total gathering throughput	Total gathering throughput	3,226	5,452	3,270	5,081	Total gathering throughput	3,317	3,226	6,259	5,452

Natural Gas Processed (MMcf/d)	Natural Gas Processed (MMcf/d)					Natural Gas Processed (MMcf/d)
Marcellus Operations	Marcellus Operations	4,001	5,487	4,201	5,641	Marcellus Operations	4,068	4,001	5,623	5,487
Utica Operations	Utica Operations	—	473	—	506	Utica Operations	—	—	521	473
Southwest Operations(5)		1,392	1,618	1,311	1,414
Southwest Operations						Southwest Operations	1,460	1,416	1,784	1,589
Southern Appalachian Operations	Southern Appalachian Operations	228	228	226	226	Southern Appalachian Operations	225	228	225	228
Bakken Operations	Bakken Operations	143	143	149	149	Bakken Operations	156	143	156	143
Rockies Operations	Rockies Operations	423	423	435	435	Rockies Operations	462	423	462	423
Total natural gas processed	Total natural gas processed	6,187	8,372	6,322	8,371	Total natural gas processed	6,371	6,211	8,771	8,343

C2 + NGLs Fractionated (mbpd)	C2 + NGLs Fractionated (mbpd)					C2 + NGLs Fractionated (mbpd)
Marcellus Operations(3)	Marcellus Operations(3)	469	469	483	483	Marcellus Operations(3)	526	469	526	469
Utica Operations(3)	Utica Operations(3)	—	27	—	28	Utica Operations(3)	—	—	30	27
Southwest Operations(5)		—	—	4	4
Southern Appalachian Operations	Southern Appalachian Operations	11	11	11	11	Southern Appalachian Operations	11	11	11	11
Bakken Operations	Bakken Operations	20	20	22	22	Bakken Operations	18	20	18	20
Rockies Operations	Rockies Operations	4	4	4	4	Rockies Operations	3	4	3	4
Total C2 + NGLs fractionated(4)	Total C2 + NGLs fractionated(4)	504	531	524	552	Total C2 + NGLs fractionated(4)	558	504	588	531


		Three Months Ended June 30,				Six Months Ended June 30,					Three Months Ended June 30,				Six Months Ended June 30,
		2022		2021		2022		2021			2023		2022		2023		2022
Pricing Information	Pricing Information									Pricing Information
Natural Gas NYMEX HH ($ per MMBtu)	Natural Gas NYMEX HH ($ per MMBtu)	$	7.50	$	2.97	$	6.04	$	2.85	Natural Gas NYMEX HH ($ per MMBtu)	$	2.32	$	7.50	$	2.54	$	6.04
C2 + NGL Pricing ($ per gallon)~~(6)~~(5)	C2 + NGL Pricing ($ per gallon)~~(6)~~(5)	$	1.18	$	0.75	$	1.16	$	0.74	C2 + NGL Pricing ($ per gallon)~~(6)~~(5)	$	0.63	$	1.18	$	0.70	$	1.16

(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) 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.

(4) Purity ethane makes up approximately ~~194~~226 mbpd and ~~190~~189 mbpd of ~~total~~ MPLX ~~Operated,~~LP consolidated total fractionated products for the three months ended June 30, ~~2022~~2023 and ~~2021,~~June 30, 2022, respectively, and approximately ~~191~~236 mbpd and ~~195~~187 mbpd of total fractionated products for the six months ended June 30, ~~2022~~2023 and ~~2021,~~June 30, 2022, respectively. Purity ethane makes up approximately ~~189~~232 mbpd and ~~185~~194 mbpd of ~~total~~ MPLX LP ~~consolidated,~~Operated total fractionated products for the three months ended June 30, ~~2022~~2023 and ~~2021,~~June 30, 2022, respectively, and approximately ~~187~~242 mbpd and ~~190~~191 mbpd of total fractionated products for the six months ended June 30, ~~2022~~2023 and ~~2021,~~June 30, 2022, respectively.

(5) The Southwest Operations for the six months ended June 30, 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.

~~(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.

~~Table of Contents~~

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~~are mitigated ~~by our~~through the use of fee-based transportation and storage services agreements with MPC that include minimum volume commitments.

Table of Contents

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.~~strategy. Overall, our exposure to the seasonality fluctuations is ~~declining~~limited due to the nature of our ~~growth in~~ fee-based business.

Liquidity and Capital Resources

Cash Flows

Our cash and cash equivalents were ~~$298~~$755 million at June 30, ~~2022~~2023 and ~~$13~~$238 million at December 31, ~~2021.~~2022. The change in cash and 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:


		Six Months Ended June 30,					Six Months Ended June 30,
(In millions)	(In millions)	2022		2021		(In millions)	2023		2022
Net cash provided by (used in):	Net cash provided by (used in):					Net cash provided by (used in):
Operating activities	Operating activities	$	2,612	$	2,489	Operating activities	$	2,664	$	2,612
Investing activities	Investing activities	(411)		(245)		Investing activities	(491)		(411)
Financing activities	Financing activities	(1,916)		(2,251)		Financing activities	(1,656)		(1,916)
Total	Total	$	285	$	(7)	Total	$	517	$	285

Net cash provided by operating activities increased ~~$123~~$52 million in the first six months of 2023 compared to the same period of 2022, primarily due to improved results from operations partially offset by higher favorable working capital changes during the first six months of 2022 compared to the ~~first six months~~same period of ~~2021, primarily due to increased net income, higher distributions from equity methods investments and decreased working capital requirements offset by higher income from equity method investments.~~2023.

Net cash used in investing activities increased ~~$166~~$80 million in the first six months of ~~2022~~2023 compared to the same period of 2022, due to higher capital spending. The increase in the first six months of ~~2021, primarily due to~~2023 was partially offset by higher ~~capital spending and an increase in~~ contributions to equity method investments for the first half of 2022, which included ~~the~~a $60 million contribution to our Bakken Pipeline joint venture to fund our share of a scheduled debt repayment by the joint venture.

~~Financing~~Net cash used in financing activities ~~were an $1,916~~decreased $260 million ~~use of cash~~ in the first six months of ~~2022~~2023 compared to the same period of 2022. The decrease was driven by net borrowings in the first half of 2023 as compared to net repayments in the first half of 2022, resulting in a ~~$2,251 million~~decreased use of cash of $854 million. There was also lower spending on the unit repurchase program of $135 million in the first ~~six months~~half of ~~2021.~~2023 compared to the same period of 2022. The ~~primary reason for the~~ decrease in the use of cash was ~~due~~partially offset by the use of $600 million to ~~net debt repayments~~redeem the Series B units and by $127 million of ~~$266 million in~~higher distributions paid to unitholders during the first ~~half~~six months of ~~2022 compared to net debt repayments of $453 million in the first half of 2021 as well as $175 million in lower unit repurchases in the first half of 2022~~2023 compared to the ~~first half~~same period of ~~2021.~~2022, as a result of the 10 percent increase in our base distribution effective for the third quarter of 2022.

Adjusted Free Cash Flow

The following table provides a reconciliation of Adjusted FCF and ~~free cash flow~~Adjusted FCF after distributions from net cash provided by operating activities for the three and six months ended June 30, ~~2022~~2023 and June 30, ~~2021.~~2022.


		Three Months Ended June 30,				Six Months Ended June 30,						Three Months Ended June 30,			Six Months Ended June 30,
(In millions)	(In millions)	2022		2021			2022		2021		(In millions)		2023		2022		2023		2022
Net cash provided by operating activities(1)	Net cash provided by operating activities(1)	$	1,487	$	1,365		$	2,612	$	2,489	Net cash provided by operating activities(1)		$	1,437	$	1,487	$	2,664	$	2,612
Adjustments to reconcile net cash provided by operating activities to free cash flow
Adjustments to reconcile net cash provided by operating activities to adjusted free cash flow											Adjustments to reconcile net cash provided by operating activities to adjusted free cash flow
Net cash used in investing activities	Net cash used in investing activities	(135)		(155)			(411)		(245)		Net cash used in investing activities		(271)		(135)		(491)		(411)
Contributions from MPC	Contributions from MPC	7		10			17		17		Contributions from MPC		5		7		13		17

Distributions to noncontrolling interests	Distributions to noncontrolling interests	(10)		(10)			(19)		(20)		Distributions to noncontrolling interests		(9)		(10)		(19)		(19)
Free cash flow		1,349		1,210			2,199		2,241
Adjusted free cash flow											Adjusted free cash flow		1,162		1,349		2,167		2,199

Distributions paid to common and preferred unitholders	Distributions paid to common and preferred unitholders	(735)		(729)			(1,493)		(1,483)		Distributions paid to common and preferred unitholders		(799)		(735)		(1,620)		(1,493)
Free cash flow after distributions		$	614	$	481		$	706	$	758
Adjusted free cash flow after distributions											Adjusted free cash flow after distributions		$	363	$	614	$	547	$	706

(1) The three months endedJune 30, 2023 and June 30, 2022 include working capital draws of $160 million and $266 million, respectively. The six months ended June 30, 2023 and June 30, 2022 include working capital draws of $112 million and $148 million, respectively.

Table of Contents

Debt and Liquidity Overview

On July 7, 2022, MPLX entered into a new five-year credit agreement (the “New MPLX Credit Agreement”) to replace the previous $3.5 billion credit facility that was scheduled to expire July 2024. The New MPLX Credit Agreement, among other things, provides for a $2 billion unsecured revolving credit facility that matures in July 2027. The New MPLX Credit Agreement provides for letter of credit issuing capacity under the facility of $150 million. Letter of credit issuing capacity is included in, not in addition to, the $2 billion borrowing capacity of the New MPLX Credit Agreement. The financial covenants of the New MPLX Credit Agreement are substantially the same as those contained in the previous credit agreement. Borrowings under the New MPLX Credit Agreement bear interest, at MPLX’s election, at either the Adjusted Term SOFR or the Alternate Base Rate, both as defined in the New MPLX Credit Agreement, plus an applicable margin.

~~On March 14, 2022,~~February 9, 2023, MPLX issued ~~$1.5~~$1.6 billion aggregate principal amount of ~~4.950~~notes, consisting of $1.1 billion principal amount of 5.00 percent senior notes due ~~March 2052~~2033 (the ~~“2052~~“2033 Senior Notes”) ~~in an underwritten public offering.~~and $500 million principal amount of 5.65 percent senior notes due 2053 (the “2053 Senior Notes”). The ~~2052~~2033 Senior Notes were offered at a price to the public of ~~98.982~~99.170 percent of par with interest payable semi-annually in arrears, commencing on September ~~14, 2022.~~1, 2023. The ~~net proceeds~~2053 Senior Notes were ~~used~~offered at a price to ~~repay amounts outstanding under~~ the ~~intercompany loan agreement~~public of 99.536 percent of par with ~~MPC and the MPLX revolving credit facility.~~interest payable semi-annually in arrears, commencing on September 1, 2023.

AsOn February 15, 2023, MPLX used $600 million of ~~June 30, 2022, we had $20.1~~the net proceeds from the offering of the 2033 Senior Notes and 2053 Senior Notes described above to redeem all of the outstanding Series B preferred units. On March 13, 2023, MPLX used the remaining proceeds from the offering, and cash on hand, to redeem all of MPLX’s and MarkWest’s $1.0 billion in aggregate principal amount of 4.50 percent senior notes ~~outstanding. The increase compared to year-end 2021 resulted from the issuance of the 2052 Senior Notes, as discussed above.~~due July 2023, at par, plus accrued and unpaid interest.

Our intention is to maintain an investment-grade credit profile. As of June 30, ~~2022,~~2023, 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.~~agencies and should not be interpreted as a recommendation to buy, sell or hold our securities. 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 New MPLX Credit Agreement contains certain representations and warranties, affirmative and restrictive covenants and events~~ A rating from one rating agency should be evaluated independently 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 New 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 subsidiariesratings from incurring debt, creating liens on assets and entering into transactions with affiliates. As of June 30, 2022, we were in compliance with the covenants, including the financial covenant with a ratio of Consolidated Total Debt to Consolidated EBITDA of 3.54 to 1.0.other rating agencies.

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 ~~New~~ MPLX Credit Agreement and may limit our ability to obtain future financing, including refinancing existing indebtedness.

Our liquidity totaled ~~$5.3~~$4.3 billion at June 30, ~~2022~~2023 consisting of:


		June 30, 2022							June 30, 2023
(In millions)	(In millions)	Total Capacity		Outstanding Borrowings		Available Capacity		(In millions)	Total Capacity		Outstanding Borrowings		Available Capacity
MPLX Credit Agreement(1)	MPLX Credit Agreement(1)	$	3,500	$	—	$	3,500	MPLX Credit Agreement(1)	$	2,000	$	—	$	2,000

MPC Loan Agreement	MPC Loan Agreement	1,500		—		1,500		MPC Loan Agreement	1,500		—		1,500
Total	Total	$	5,000	$	—	5,000		Total	$	3,500	$	—	3,500
Cash and cash equivalents	Cash and cash equivalents					298		Cash and cash equivalents					755
Total liquidity	Total liquidity					$	5,298	Total liquidity					$	4,255

(1) Outstanding borrowings include less than $1 million in letters of credit outstanding under this facility. ~~Our total capacity decreased to $2 billion upon the execution of the New MPLX Credit Agreement on July 7, 2022.~~

We expect our ongoing sources of liquidity to include cash generated from operations and borrowings under ~~the MPC Loan Agreement, the New MPLX Credit Agreement~~our revolving credit facilities 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

~~Table of Contents~~

expenditure requirements, contractual obligations, and quarterly cash distributions. Our material future obligations include interest on debt, payments of debt principal, purchase obligations including contracts to acquire plant, property and equipment, and our operating leases and service agreements. 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.

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,

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creating liens on assets and entering into transactions with affiliates. As of June 30, 2023, we were in compliance with this financial covenant with a ratio of Consolidated Total Debt to Consolidated EBITDA of 3.5 to 1.0, as well as all other covenants contained in the MPLX Credit Agreement.

Equity and Preferred Units Overview

~~Common units~~

~~The table below summarizes the changes in the number of units outstanding through June 30, 2022:~~

~~(In units)~~

~~Common Units~~

~~Balance at December 31, 2021~~

~~1,016,178,378~~

~~Unit-based compensation awards~~

~~183,478~~

~~Units redeemed in unit repurchase program~~

~~(4,156,956)~~

~~Balance at June 30, 2022~~

~~1,012,204,900~~

Unit Repurchase Program

During the six months ended June 30, 2022, we repurchased approximately 4 million common units at an average cost per unit of $32.48 per unit and paid $135 million of cash. As of June 30, 2022, we had repurchased a total of approximately 29 million units at an average cost per unit of $27.97 per unit for a total of $798 million under the unit repurchase program. As of June 30, 2022, we had $202 million remaining under the existing repurchase authorization.

On August 2, 2022 ~~MPLX~~we announced the board authorization for the repurchase of ~~directors approved~~up to an ~~incremental~~additional $1.0 billion ~~unit repurchase authorization.~~of MPLX common units held by the public. The authorization has no expiration date. We may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, accelerated unit repurchases, tender offers or open market solicitations for units, some of which may be effected through Rule 10b5-1 plans. The timing and amount of future repurchases, if any, will depend upon several factors, including market and business conditions, and such repurchases may be discontinued at any time.

No units were repurchased during the six months ended June 30, 2023. As of June 30, 2023, we had $846 million remaining under the repurchase authorization.

Redemption of the Series B Preferred Units

On February 15, 2023, MPLX exercised its right to redeem all 600,000 outstanding units of 6.875 percent Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (the “Series B preferred units”). MPLX paid unitholders the Series B preferred unit redemption price of $1,000 per unit. See Note 5 to the unaudited consolidated financial statements for more information.

Distributions on the Series B preferred units were payable semi-annually in arrears on the 15th day, or the first business day thereafter, of February and August of each year up to and including February 15, 2023. In accordance with these terms, MPLX made a final cash distribution of $21 million to Series B preferred unitholders on February 15, 2023, in conjunction with the redemption.

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~~$263 million per quarter, or ~~$1,063~~$1,051 million per year, based on the number of common units outstanding at June 30, ~~2022.~~2023.

On July ~~26, 2022,~~25, 2023, MPLX declared a cash distribution for the second quarter of ~~2022,~~2023, totaling ~~$714~~$776 million, or ~~$0.7050~~$0.775 per common unit. This distribution will be paid on August ~~12, 2022~~14, 2023 to common unitholders of record on August ~~5, 2022.~~4, 2023. 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 will be paid to Series B unitholders on August 15, 2022.

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 and six months ended June 30, ~~2022~~2023 and ~~2021.~~June 30, 2022. 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 June 30,				Six Months Ended June 30,
(In millions, except per unit data)	2023		2022		2023		2022
Distribution declared:
Limited partner units - public	$	274	$	257	$	548	$	514
Limited partner units - MPC	502		457		1,004		913




Total LP distribution declared	776		714		1,552		1,427
Series A preferred units	23		21		46		42
Series B preferred units(1)	—		10		5		21
Total distribution declared	$	799	$	745	1,603		1,490

Quarterly cash distributions declared per limited partner common unit	$	0.775	$	0.705	$	1.5500	$	1.4100

43(1) The six months ended June 30, 2023, includes the portion of the $21 million distribution paid to the Series B preferred unitholders on February 15, 2023 that was earned during the period prior to redemption.

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Three Months Ended June 30, Six Months Ended June 30,
(In millions, except per unit data) 2022 2021 2022 2021
Distribution declared:
Limited partner units - public $ 257 $ 260 $ 514 $ 522
Limited partner units - MPC 457 445 913 890
Total LP distribution declared 714 705 1,427 1,412
Series A preferred units 21 21 42 41
Series B preferred units 10 10 21 21
Total distribution declared 745 736 1,490 1,474
Quarterly cash distributions declared per limited partner common unit $ 0.7050 $ 0.6875 $ 1.4100 $ 1.3750

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~~growth capital expenditures and ~~growth~~maintenance 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, growthGrowth 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. In contrast, 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.

MPLX’s initial capital investment plan for ~~2022, totaled $900~~2023 totals $950 million, net of reimbursements, which includes growth capital of ~~$700~~$800 million and maintenance capital of ~~$140 million and a $60 million investment in an unconsolidated affiliate for the repayment of our 9.19 percent indirect share of the Bakken Pipeline joint venture’s debt due in 2022.~~$150 million. Growth capital expenditures and investments in affiliates during the six months ended June 30, ~~2022~~2023 were primarily for gas ~~gathering,~~ processing plants and ~~de-ethanization~~gathering projects in ~~our Bakken,~~the Marcellus and ~~Southwest~~Permian basins, ~~and the expansion of our crude gathering systems and long-haul pipeline investments in the Permian and Bakken basins. Spending for the period also included the $60 million contribution~~as well as additions to our ~~Bakken Pipeline joint venture to fund our share of a debt repayment by the joint venture.~~brown water marine fleet. We continuously evaluate our capital plan and make changes as conditions warrant.

Our capital expenditures are shown in the table below:


		Six Months Ended June 30,					Six Months Ended June 30,
(In millions)	(In millions)	2022		2021		(In millions)	2023		2022
Capital expenditures:	Capital expenditures:					Capital expenditures:
Growth capital expenditures	Growth capital expenditures	$	278	$	155	Growth capital expenditures	$	366	$	278

Growth capital reimbursements(1)						Growth capital reimbursements(1)	(80)		(32)
Investments in unconsolidated affiliates	Investments in unconsolidated affiliates	156		84		Investments in unconsolidated affiliates	77		156

Capitalized interest	Capitalized interest	(5)		(10)		Capitalized interest	(6)		(5)
Total growth capital expenditures(1)		429		229
Total growth capital expenditures(2)						Total growth capital expenditures(2)	357		397
Maintenance capital expenditures	Maintenance capital expenditures	70		46		Maintenance capital expenditures	78		70
Maintenance capital reimbursements	Maintenance capital reimbursements	(17)		(17)		Maintenance capital reimbursements	(13)		(17)

Capitalized interest						Capitalized interest	(1)		—
Total maintenance capital expenditures	Total maintenance capital expenditures	53		29		Total maintenance capital expenditures	64		53

Total growth and maintenance capital expenditures	Total growth and maintenance capital expenditures	482		258		Total growth and maintenance capital expenditures	421		450
Investments in unconsolidated affiliates(2)		(156)		(84)
Investments in unconsolidated affiliates(3)						Investments in unconsolidated affiliates(3)	(77)		(156)

Maintenance capital reimbursements(3)		17		17
(Increase)/ decrease in capital accruals		(54)		34
Growth and maintenance capital reimbursements(4)						Growth and maintenance capital reimbursements(4)	93		49
Increase in capital accruals						Increase in capital accruals	(12)		(54)
Capitalized interest	Capitalized interest	5		10		Capitalized interest	7		5
Additions to property, plant and equipment, net(2)		$	294	$	235
Additions to property, plant and equipment(3)						Additions to property, plant and equipment(3)	$	432	$	294

(1) Growth capital reimbursements include reimbursements from customers and our Sponsor. Prior periods have been updated to reflect these reimbursements to conform to the current period presentation.

(2) Total growth capital expenditures exclude $28 million of acquisitions for the six months ended June 30, 2022.

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~~(2)~~(3) Investments in unconsolidated affiliates ~~acquisitions,~~ and additions to property, plant and equipment ~~net~~ are shown as separate lines within investing activities in the Consolidated Statements of Cash Flows.

~~(3)~~(4) Growth capital reimbursements are included in changes in deferred revenue within operating activities in the Consolidated Statements of Cash Flows. 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 June 30, ~~2022,~~2023, 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 six months ended June 30, ~~2022,~~2023, our ~~third-party long-term~~ debt obligations increased by ~~$1.2 billion, primarily~~$600 million due to the issuance of ~~the $1.5 billion aggregate principal amount of 4.950 percent 2052~~ Senior Notes ~~discussed above. A portion~~and use of ~~the issuance was used to repay amounts outstanding on the MPLX Credit Agreement.~~proceeds described above in Liquidity and Capital Resources-Debt and Liquidity Overview. There were no other material changes to our contractual obligations outside the ordinary course of business since December 31, ~~2021.~~2022.

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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 ~~15.~~ 14 of the unaudited consolidated financial statements and indemnities as disclosed in our Annual Report on Form 10-K for the year ended December 31, 2022.

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 June 30, ~~2022,~~2023, MPC owned our non-economic general partnership interest and held approximately 6465 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.

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

Three Months Ended June 30, Six Months Ended June 30,
2022 2021 2022 2021
Total revenues and other income 45 % 47 % 46 % 52 %
Total costs and expenses(1)
23 % 27 % 24 % 28 %

~~(1) 2021 periods exclude losses for impairment.~~


	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
Total revenues and other income	50	%	45	%	50	%	46	%
Total costs and expenses	27	%	23	%	27	%	24	%

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~~2022 and Note 4 ~~of the Notes~~ to the ~~Consolidated Financial Statements~~unaudited 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 sixmonths ended June 30, 2022, environmental remediation costs increased due to a release of crude oil on our pipeline near Edwardsville, Illinois~~As previously disclosed in ~~March of 2022. There have been no additional material changes to our environmental matters and compliance costs since~~ our Annual Report on Form 10-K for the year ended December 31, ~~2021.~~2022, actual expenditures may vary as the number and scope of environmental projects are revised as a result of improved technology or changes in regulatory requirements. There have been no significant changes to our environmental matters and compliance costs during the six months ended June 30, 2023.

Critical Accounting Estimates

As of June 30, ~~2022,~~2023, 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.~~

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2022.

Accounting Standards Not Yet Adopted

We have not identified any recent accounting pronouncements that are expected to have a material impact on our financial condition, results of operations or cash flows upon adoption. Accounting standards are discussed in Note 2 of the ~~Notes to the Consolidated Financial Statements.~~unaudited consolidated financial statements.

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Item 3. Quantitative and Qualitative Disclosures about Market Risk

We are exposed to market risks related to the volatility of commodity prices. We employ various strategies, including the ~~potential~~ use of commodity derivative instruments, to economically hedge the risks related to these price fluctuations. We are also exposed to market risks related to changes in interest rates. As of June 30, ~~2022,~~2023, we did not have any open financial ~~or commodity~~ derivative instruments to hedge the economic risks related to interest rate ~~fluctuations or the volatility of commodity prices, respectively;~~fluctuations; however, we continually monitor the market and our exposure and may enter into these arrangements in the future.

Commodity Price Risk

The information about commodity price risk for the three and six months ended June 30, ~~2022~~2023 does not differ materially from that discussed in Item 7A. Quantitative and Qualitative Disclosures about Market Risk of our Annual Report on Form 10-K for the year ended December 31, ~~2021.~~2022.

Outstanding Derivative Contracts and Sensitivity Analysis

See Notes 9 and 10 to the unaudited consolidated financial statements for more information about the fair value measurement of our derivative instruments, including the natural gas embedded derivative, as well as the amounts recorded in our consolidated balance sheets and statements of income. We do not designate any of our commodity derivative instruments as hedges for accounting purposes.

Our open derivative positions at June 30, 2023 will expire at various times through 2023. We prepared a sensitivity analysis to estimate our exposure to market risk associated with our derivative instruments. Based on our open net positions at June 30, 2023, a 10 percent change in quoted market prices of our derivative instruments, assuming all other factors remain constant, could change the fair value of our derivative instruments and Income before income taxes by $2.0 million. This analysis may differ from actual results.

Interest Rate Risk and Sensitivity Analysis

Sensitivity analysis of the effect of a hypothetical 100-basis-point change in interest rates on outstanding third-party debt, excluding finance leases, is provided in the following table. Fair value of cash and cash equivalents, receivables, accounts payable and accrued interest approximate carrying value and are relatively insensitive to changes in interest rates due to the short-term maturity of the instruments. Accordingly, these instruments are excluded from the table.


(In millions)	(In millions)	Fair Value as of June 30, 2022(1)		Change in Fair Value(2)		Change in Income Before Income Taxes for the Six Months Ended June 30, 2022(3)		(In millions)	Fair Value as of June 30, 2023(1)		Change in Fair Value(2)		Change in Income Before Income Taxes for the Three Months Ended June 30, 2023(3)
Outstanding debt	Outstanding debt							Outstanding debt
Fixed-rate	Fixed-rate	$	18,604	$	1,478	N/A		Fixed-rate	$	18,671	$	1,523	N/A
Variable-rate(4)	Variable-rate(4)	$	—	$	—	$	1	Variable-rate(4)	$	—	$	—	$	—

(1) Fair value was based on market prices, where available, or current borrowing rates for financings with similar terms and maturities.

(2) Assumes a 100-basis-point decrease in the weighted average yield-to-maturity at June 30, ~~2022.~~2023.

(3) Assumes a 100-basis-point change in interest rates. The change to ~~net~~ income before income taxes was based on the weighted average balance of all outstanding variable-rate debt for the six months ended June 30, ~~2022.~~2023.

(4) MPLX had no outstanding borrowings on the MPLX Credit Agreement as of June 30, ~~2022.~~2023.

At June 30, ~~2022,~~2023, our portfolio of third‑party debt consisted of fixed-rate instruments and ~~also provides for~~outstanding borrowings, if any, under the MPLX Credit Agreement. The fair value of our fixed-rate debt is relatively sensitive to interest rate fluctuations. Our sensitivity to interest rate declines and corresponding increases in the fair value of our debt portfolio unfavorably affects our results of operations and cash flows only when we elect to repurchase or otherwise retire fixed-rate debt at prices above carrying value. Interest rate fluctuations generally do not impact the fair value of borrowings under our MPLX Credit Agreement, but may affect our results of operations and cash flows.

See Note 9 toin the unaudited consolidated financial statements for additional information on the fair value of our debt.

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Item 4. Controls and Procedures

Disclosure Controls and Procedures

An evaluation of the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended) was carried out under the supervision and with the participation of management, including the chief executive officer and chief financial officer of our general partner. Based

upon that evaluation, the chief executive officer and chief financial officer of our general partner concluded that the design and operation of these disclosure controls and procedures were effective as of June 30, ~~2022,~~2023, the end of the period covered by this report.

Changes in Internal Control Over Financial Reporting

During the quarter ended June 30, ~~2022,~~2023, there were no changes in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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Part II – Other Information

Item 1. Legal Proceedings

We are the subject of, or a party to, a number of pending or threatened legal actions, contingencies and commitments involving a variety of matters, including laws and regulations relating to the environment. While it is possible that an adverse result in one or more of the lawsuits or proceedings in which we are a defendant could be material to us, based upon current information and our experience as a defendant in other matters, we believe that these lawsuits and proceedings, individually or in the aggregate, will not have a material adverse effect on our consolidated results of operations, financial position or cash flows.

Item 103 of Regulation S-K promulgated by the SEC requires disclosure of certain environmental matters when a governmental authority is a party to the proceedings and such proceedings involve potential monetary sanctions, unless we reasonably believe that the matter will result in no monetary sanctions, or in monetary sanctions, exclusive of interest and costs, of less than ~~$300,000.~~a specified threshold. We use a threshold of $1 million for this purpose.

There have been no material changes to the legal matters previously disclosed in our Annual Report on Form 10-K for the year ended December 31, ~~2021,~~2022, or in our Quarterly Report on Form 10-Q for the quarter ended March 31, ~~2022.~~2023.

Item 1A. Risk Factors

There have been no material changes from the risk factors previously disclosed in our Annual Report on Form 10-K for the year ended December 31, ~~2021.~~2022.

Item ~~2. Unregistered Sales of Equity Securities and Use of Proceeds~~5. Other Information

~~The following table sets forth a summary of our purchases during~~

During the quarter ended June 30, ~~2022,~~2023, no director or officer (as defined in Rule 16a-1(f) promulgated under the Exchange Act) of ~~equity securities that are registered by~~ MPLX ~~pursuant to Section 12~~adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement” (as each term is defined in Item 408 of ~~the Securities Exchange Act of 1934, as amended.~~

Millions of Dollars
Period Total Number of Units Purchased
Average Price
Paid per
Unit(1)
Total Number of Units Purchased as Part of Publicly Announced Plans or Programs
Maximum Dollar Value of Units that May Yet Be Purchased Under the Plans or Programs(2)
4/01/2022-4/30/2022 1,037,434 $ 33.74 1,037,434 $ 202
5/01/2022-5/31/2022 — — — 202
6/01/2022-6/30/2022 — — — $ 202
Total 1,037,434 $ 33.74 1,037,434

~~(1)~~Amounts in this column reflect the weighted average price paid for units purchased under our unit repurchase authorization. The weighted average price includes commissions paid to brokers during the quarter.

~~(2)On November 2, 2020, we announced the board authorization of a unit repurchase program for the repurchase of up to $1 billion of MPLX’s common units held by the public.~~ ~~On August 2, 2022, we announced our board of directors had approved an additional $1 billion unit repurchase authorization, which is not reflected in this column. These unit repurchase authorizations have no expiration date.~~Regulation S-K).

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Item 6. Exhibits

Incorporated by Reference From
Exhibit
Number Exhibit Description Form Exhibit Filing Date SEC File No. Filed
Herewith Furnished
Herewith
3.1
Certificate of Limited Partnership of MPLX LP
S-1 3.1 7/2/2012 333-182500
3.2
Amendment to the Certificate of Limited Partnership of MPLX LP
S-1/A 3.2 10/9/2012 333-182500
3.3
Sixth Amended and Restated Agreement of Limited Partnership of MPLX LP, dated as of February 1, 2021
8-K 3.1 2/3/2021 001-35714
10.1
Master Amendment to Transportation Services Agreements, dated as of June 30, 2022, by and among Marathon Petroleum Company LP, Marathon Petroleum Supply and Trading LLC, Marathon Pipe Line LLC and Ohio River Pipe Line LLC
8-K 10.1 7/6/2022 001-35714
10.2
Revolving Credit Agreement, dated as of July 7, 2022, by and among MPLX LP, as borrower, Wells Fargo Bank, National Association, as administrative agent, each of Wells Fargo Securities, LLC, JPMorgan Chase Bank, N.A., Barclays Bank PLC, BofA Securities, Inc., Citibank, N.A., Mizuho Bank, Ltd., MUFG Bank, Ltd., RBC Capital Markets and TD Securities (USA) LLC, as joint lead arrangers and joint bookrunners, JPMorgan Chase Bank, N.A., as syndication agent, each of Bank of America, N.A., Barclays Bank PLC, Citibank, N.A., Mizuho Bank, Ltd., MUFG Bank, Ltd., Royal Bank of Canada and The Toronto-Dominion Bank, New York Branch, as documentation agents, and the other lenders and issuing banks that are parties thereto
8-K 10.1 7/12/2022 001-35714
10.3
Seventh Amendment to Third Amended and Restated Terminal Services Agreement, dated March 1, 2017, between MPLX Terminals LLC and Marathon Petroleum Company LP
X
31.1
Certification of Chief Executive Officer pursuant to Rule 13a-14 and 15d-14 under the Securities Exchange Act of 1934
X
31.2
Certification of Chief Financial Officer pursuant to Rule 13a-14 and 15d-14 under the Securities Exchange Act of 1934
X
32.1
Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350
X
32.2
Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350
X
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Incorporated by Reference From

Exhibit
Number

Exhibit Description

Form

Exhibit

Filing Date

SEC File No.

Filed
Herewith

Furnished
Herewith

3.1

Certificate of Limited Partnership of MPLX LP

S-1

3.1

7/2/2012

333-182500

3.2

Amendment to the Certificate of Limited Partnership of MPLX LP

S-1/A

3.2

10/9/2012

333-182500

3.3

Sixth Amended and Restated Agreement of Limited Partnership of MPLX LP, dated as of February 1, 2021

8-K

3.1

2/3/2021

001-35714

10.1

Fifth Amendment to the Terminal Services Agreement, dated as of June 1, 2023, by and between the MPLX LP and Marathon Petroleum Corporation subsidiaries party thereto

10.2

Sixth Amendment to the Terminal Services Agreement, dated as of June 30, 2023, by and between the MPLX LP and Marathon Petroleum Corporation subsidiaries party thereto

10.3

Intercompany Assignment Agreement of the Terminal Services Agreement, dated as of May 1, 2023, by and between the MPLX LP and Marathon Petroleum Corporation subsidiaries party thereto

10.4

Eighth Amendment to the Third Amended and Restated Terminal Services Agreement, dated March 1, 2017, between MPLX Terminals LLC and Marathon Petroleum Company LP

31.1

Certification of Chief Executive Officer pursuant to Rule 13a-14 and 15d-14 under the Securities Exchange Act of 1934

31.2

Certification of Chief Financial Officer pursuant to Rule 13a-14 and 15d-14 under the Securities Exchange Act of 1934

32.1

Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350

32.2

Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350

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~~Form~~

~~Exhibit~~

~~Filing Date~~

~~SEC File No.~~

Filed
Herewith

Furnished
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~~Inline XBRL Taxonomy Extension Calculation Linkbase Document.~~

~~101.DEF~~

~~Inline XBRL Taxonomy Extension Definition Linkbase Document.~~

~~101.LAB~~

~~Inline XBRL Taxonomy Extension Label Linkbase Document.~~

~~101.PRE~~

~~Inline XBRL Taxonomy Extension Presentation Linkbase Document.~~

~~104~~

~~Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).~~

Table of Contents

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.


	MPLX LP

	By:	MPLX GP LLC
		Its general partner

Date: August ~~2, 2022~~1, 2023	By:	/s/ Kelly D. Wright
		Kelly D. Wright
		Vice President and Controller of MPLX GP LLC (the general partner of MPLX LP)


	Six Months Ended June 30, 2022
(In millions)	VIEs		Non-VIEs		Total
Revenues and other income	$	550	$	637	$	1,187
Costs and expenses	299		279		578
Income from operations	251		358		609
Net income	227		328		555
Income from equity method investments	$	124	$	86	$	210


	Six Months Ended June 30, 2021
(In millions)	VIEs		Non-VIEs		Total
Revenues and other income	$	336	$	607	$	943
Costs and expenses	217		284		501
Income from operations	119		323		442
Net income	105		283		388
Income from equity method investments	$	73	$	63	$	136


	Three Months Ended June 30, 2022				Three Months Ended June 30, 2021
(In millions)	Related Party		Third Party		Related Party		Third Party
Operating leases:
Rental income	$	198	$	102	$	168	$	99
Sales-type leases:

Interest income (Sales-type rental revenue-fixed minimum)	112		—		135		—
Interest income (Revenue from variable lease payments)	2		—		1		—
Sales-type lease revenue	$	114	$	—	$	136	$	—


					Millions of Dollars
Period	Total Number of Units Purchased	Average Price Paid per Unit(1)		Total Number of Units Purchased as Part of Publicly Announced Plans or Programs	Maximum Dollar Value of Units that May Yet Be Purchased Under the Plans or Programs(2)
4/01/2022-4/30/2022	1,037,434	$	33.74	1,037,434	$	202
5/01/2022-5/31/2022	—	—		—	202
6/01/2022-6/30/2022	—	—		—	$	202
Total	1,037,434	$	33.74	1,037,434