Insider Transactions Reported by 24 Insiders of MPLX LP

Symbol: MPLX on NYSE, MPLXP on OTC
Location: Findlay, OH

Quick Takeaways

MPLX - MPLX LP has 24 insiders with reported activity on this page.
No net insider buy/sell flow is currently reported for the last year.
Recent transaction rows are available for direct filing-level review.

What Changed

No meaningful buy/sell imbalance is currently visible in the one-year window.
Activity will update as new Forms 3/4/5 are filed.

Why This Matters

This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.

Source Evidence

Filed on Form 4

Issuer insider activity is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Insider trading overview

Last 12 months

Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 27 Apr 2025.

Buys

Shares: 0

Insiders: 0

Sells

Shares: 0

Insiders: 0

Net

Shares: 0

Insiders: 0

Window (months)	Buy $	Sell $	Net $
0-3	$0	$0	$0
3-6	$0	$0	$0
6-9	$0	$0	$0
9-12	$0	$0	$0

MPLX LP executives and other stock owners filed with the SEC include:

Name	Relationship	Holdings Value	Valuation	Report Date
Frank M. Semple	Director	$28,715,688	Mixed	17 Feb 2026
Michael J. Hennigan	Executive Chairman, Director	$19,698,664	Mixed	12 Dec 2025
Mannen Maryann T.	Chairman, President & CEO, Director	$9,798,481	Mixed	01 Mar 2026
Garry L. Peiffer	Director	$6,615,533	Mixed	17 Feb 2026
Gregory S. Floerke	Exec. VP and COO	$5,645,857	Mixed	01 Mar 2026
Dan D. Sandman	Director	$4,669,330	Mixed	03 Apr 2023
John J. Quaid	Director	$4,578,267	Mixed	01 Mar 2025
John P. Surma	Director	$4,240,103	Mixed	17 Feb 2026
Christopher A. Helms	Director	$3,860,262	Mixed	17 Feb 2026
Donald C. Templin	Director	$3,644,080	Mixed	19 Nov 2021
Molly R. Benson	Chief Legal Ofc & Corp Sec	$2,730,871	Mixed	01 Mar 2026
J. Michael Stice	Director	$2,492,856	Mixed	17 Feb 2026
Suzanne Gagle	General Counsel	$2,460,375	Mixed	01 Dec 2023
Pamela K.m. Beall	Director	$1,949,372	Mixed	09 Dec 2021
Shawn M. Lyon	Senior VP, Log. & Storage	$1,675,274	Mixed	01 Mar 2026
Timothy J. Aydt	Exec. VP and Chief Comm Ofc.	$1,258,322	Mixed	01 Mar 2022
Carl Kristopher Hagedorn	Exec VP & Chief Fin Ofc, Director	$1,208,620	Mixed	01 Mar 2026
Thomas Kaczynski	Senior VP, Finance & Treasurer	$662,312	Mixed	02 Dec 2022
Christine S. Breves	Director	$447,982	Mixed	17 Feb 2026
Rebecca L. Iten	VP and Controller	$13,782	Mixed	03 Mar 2025
Erin M. Brzezinski	VP and Controller		Mixed	01 Apr 2026
Kelly D. Wright	VP and Controller		Mixed	01 Sep 2021
Ray N. Walker Jr.	Director		Mixed	17 Feb 2026
Maria A. Khoury	Director		Mixed	01 Mar 2026

Top shareholders of MPLX LP (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
Invesco Ltd.	13F	Company	— class O/S missing	18,187,878	$970,687,049	—	31 Dec 2025	13F
Blackstone Inc.	13F	Company	— class O/S missing	15,705,485	$838,201,734	—	31 Dec 2025	13F
TORTOISE CAPITAL ADVISORS, L.L.C.	13F	Company	— class O/S missing	13,319,918	$710,884,024	—	31 Dec 2025	13F
GOLDMAN SACHS GROUP INC	13F	Company	— class O/S missing	12,466,987	$665,363,078	—	31 Dec 2025	13F
BANK OF AMERICA CORP /DE/	13F	Company	— class O/S missing	8,531,066	$455,302,994	—	31 Dec 2025	13F
KAYNE ANDERSON CAPITAL ADVISORS LP	13F	Company	— class O/S missing	7,227,400	$385,726,338	—	31 Dec 2025	13F
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	13F	Company	— class O/S missing	6,908,382	$368,700,347	—	31 Dec 2025	13F
MORGAN STANLEY	13F	Company	— class O/S missing	5,763,110	$307,577,192	—	31 Dec 2025	13F
CHICKASAW CAPITAL MANAGEMENT LLC	13F	Company	— class O/S missing	5,429,906	$289,794,000	—	31 Dec 2025	13F
UBS Group AG	13F	Company	— class O/S missing	5,304,746	$283,114,294	—	31 Dec 2025	13F
Energy Income Partners, LLC	13F	Company	— class O/S missing	5,299,724	$282,846,270	—	31 Dec 2025	13F
Brave Warrior Advisors, LLC	13F	Company	— class O/S missing	4,474,115	$238,783,518	—	31 Dec 2025	13F
JPMORGAN CHASE & CO	13F	Company	— class O/S missing	3,286,142	$175,381,398	—	31 Dec 2025	13F
BROOKFIELD Corp /ON/	13F	Company	— class O/S missing	2,959,830	$157,966,145	—	31 Dec 2025	13F
ING GROEP NV	13F	Company	— class O/S missing	2,903,800	$154,975,806	—	31 Dec 2025	13F
CIBC Private Wealth Group LLC	13F	Company	— class O/S missing	2,724,200	$145,390,554	—	31 Dec 2025	13F
Clearbridge Investments, LLC	13F	Company	— class O/S missing	2,343,689	$125,082,682	—	31 Dec 2025	13F
MILLER HOWARD INVESTMENTS INC /NY	13F	Company	— class O/S missing	2,315,921	$123,600,719	—	31 Dec 2025	13F
Fractal Investments LLC	13F	Company	— class O/S missing	2,051,301	$109,477,934	—	31 Dec 2025	13F
EAGLE GLOBAL ADVISORS LLC	13F	Company	— class O/S missing	1,884,585	$100,580,301	—	31 Dec 2025	13F
CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT	13F	Company	— class O/S missing	1,883,800	$100,538,406	—	31 Dec 2025	13F
DUFF & PHELPS INVESTMENT MANAGEMENT CO	13F	Company	— class O/S missing	1,832,003	$97,774,000	—	31 Dec 2025	13F
FMR LLC	13F	Company	— class O/S missing	1,668,643	$89,055,477	—	31 Dec 2025	13F
AlphaCore Capital LLC	13F	Company	— class O/S missing	1,606,602	$85,744,345	—	31 Dec 2025	13F
STIFEL FINANCIAL CORP	13F	Company	— class O/S missing	1,328,139	$70,882,810	—	31 Dec 2025	13F
Epoch Investment Partners, Inc.	13F	Company	— class O/S missing	1,156,589	$61,727,155	—	31 Dec 2025	13F
Mariner, LLC	13F	Company	— class O/S missing	1,153,276	$61,550,350	—	31 Dec 2025	13F
Neuberger Berman Group LLC	13F	Company	— class O/S missing	1,124,270	$60,002,290	—	31 Dec 2025	13F
BNP PARIBAS FINANCIAL MARKETS	13F	Company	— class O/S missing	1,106,127	$59,033,998	—	31 Dec 2025	13F
Progeny 3, Inc.	13F	Company	— class O/S missing	1,058,959	$56,516,642	—	31 Dec 2025	13F
INFRASTRUCTURE CAPITAL ADVISORS, LLC	13F	Company	— class O/S missing	1,037,984	$55,397,206	—	31 Dec 2025	13F
RAYMOND JAMES FINANCIAL INC	13F	Company	— class O/S missing	955,698	$51,005,610	—	31 Dec 2025	13F
BARCLAYS PLC	13F	Company	— class O/S missing	915,691	$48,870,430	—	31 Dec 2025	13F
COHEN & STEERS, INC.	13F	Company	— class O/S missing	880,593	$46,997,000	—	31 Dec 2025	13F
DEUTSCHE BANK AG\	13F	Company	— class O/S missing	853,780	$45,566,239	—	31 Dec 2025	13F
Allianz Asset Management GmbH	13F	Company	— class O/S missing	829,136	$44,250,988	—	31 Dec 2025	13F
ROYAL BANK OF CANADA	13F	Company	— class O/S missing	791,478	$42,240,000	—	31 Dec 2025	13F
LONGFELLOW INVESTMENT MANAGEMENT CO LLC	13F	Company	— class O/S missing	766,529	$40,909,653	—	31 Dec 2025	13F
Americana Partners, LLC	13F	Company	— class O/S missing	760,306	$40,577,518	—	31 Dec 2025	13F
WELLS FARGO & COMPANY/MN	13F	Company	— class O/S missing	748,670	$39,956,465	—	31 Dec 2025	13F
REAVES W H & CO INC	13F	Company	— class O/S missing	670,500	$35,784,585	—	31 Dec 2025	13F
JENNISON ASSOCIATES LLC	13F	Company	— class O/S missing	670,327	$35,775,352	—	31 Dec 2025	13F
Appaloosa LP	13F	Company	— class O/S missing	627,500	$33,489,675	—	31 Dec 2025	13F
Northside Capital Management, LLC	13F	Company	— class O/S missing	590,080	$31,492,596	—	31 Dec 2025	13F
U.S. Capital Wealth Advisors, LLC	13F	Company	— class O/S missing	578,421	$30,870,327	—	31 Dec 2025	13F
EXCHANGE TRADED CONCEPTS, LLC	13F	Company	— class O/S missing	558,737	$29,819,794	—	31 Dec 2025	13F
Frank M. Semple	3/4/5	Director	— class O/S missing	551,466	$28,715,688	—	17 Feb 2026	3/4/5
Chicago Partners Investment Group LLC	13F	Company	— class O/S missing	479,604	$26,459,747	—	31 Dec 2025	13F
LPL Financial LLC	13F	Company	— class O/S missing	478,898	$25,558,791	—	31 Dec 2025	13F
CITIGROUP INC	13F	Company	— class O/S missing	463,865	$24,756,475	—	31 Dec 2025	13F

Recent Insider Transactions by Companies or Individuals for MPLX LP

Showing up to 300 most recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	Shares	Shares Owned	Date	Ownership
Maryann T. Mannen	MPLX	Common Units (Limited Partner Interests)	Tax liability	-7.4%	-13,220	165,459	02 Mar 2026	Direct
Shawn M. Lyon	MPLX	Common Units (Limited Partner Interests)	Tax liability	-8.86%	-2,751	28,289	02 Mar 2026	Direct
Carl Kristopher Hagedorn	MPLX	Common Units (Limited Partner Interests)	Tax liability	-8.93%	-2,001	20,409	02 Mar 2026	Direct
Gregory S. Floerke	MPLX	Common Units (Limited Partner Interests)	Tax liability	-2.94%	-2,892	95,337	02 Mar 2026	Direct
Molly R. Benson	MPLX	Common Units (Limited Partner Interests)	Tax liability	-5.82%	-2,852	46,114	02 Mar 2026	Direct
Maryann T. Mannen	MPLX	Common Units (Limited Partner Interests)	Award	42%	52,817	178,679	01 Mar 2026	Direct
Shawn M. Lyon	MPLX	Common Units (Limited Partner Interests)	Award	23.9%	5,986	31,040	01 Mar 2026	Direct
Maria A. Khoury	MPLX	Common Units (Limited Partner Interests)	Award		8,451	8,451	01 Mar 2026	Direct
Carl Kristopher Hagedorn	MPLX	Common Units (Limited Partner Interests)	Award	28.2%	4,930	22,410	01 Mar 2026	Direct
Gregory S. Floerke	MPLX	Common Units (Limited Partner Interests)	Award	6.49%	5,986	98,229	01 Mar 2026	Direct
Molly R. Benson	MPLX	Common Units (Limited Partner Interests)	Award	21.9%	8,803	48,966	01 Mar 2026	Direct
Ray N. Walker Jr.	MPLX	Common Units (Limited Partner Interests)	Award	1.88%	32.13	1,744	17 Feb 2026	Direct
John P. Surma	MPLX	Common Units (Limited Partner Interests)	Award	1.72%	1,505	89,190	17 Feb 2026	Direct
J. Michael Stice	MPLX	Common Units (Limited Partner Interests)	Award	1.88%	982	53,295	17 Feb 2026	Direct
Frank M. Semple	MPLX	Common Units (Limited Partner Interests)	Award	1.88%	1,072	58,172	17 Feb 2026	Direct
Garry L. Peiffer	MPLX	Common Units (Limited Partner Interests)	Award	1.88%	1,181	64,072	17 Feb 2026	Direct
Christopher A. Helms	MPLX	Common Units (Limited Partner Interests)	Award	1.62%	1,285	80,751	17 Feb 2026	Direct
Christine S. Breves	MPLX	Common Units (Limited Partner Interests)	Award	1.88%	218	11,837	17 Feb 2026	Direct
Shawn M. Lyon	MPLX	Common Units (Limited Partner Interests)	Tax liability	-0.97%	-245	25,054	12 Dec 2025	Direct
Michael J. Hennigan	MPLX	Common Units (Limited Partner Interests)	Tax liability	-0.37%	-1,335	359,137	12 Dec 2025	Direct
Gregory S. Floerke	MPLX	Common Units (Limited Partner Interests)	Tax liability	-0.26%	-242	92,243	12 Dec 2025	Direct
Molly R. Benson	MPLX	Common Units (Limited Partner Interests)	Tax liability	-0.76%	-306	40,163	12 Dec 2025	Direct
Ray N. Walker Jr.	MPLX	Common Units (Limited Partner Interests)	Award	2.02%	33.94	1,712	14 Nov 2025	Direct
John P. Surma	MPLX	Common Units (Limited Partner Interests)	Award	1.85%	1,590	87,685	14 Nov 2025	Direct
J. Michael Stice	MPLX	Common Units (Limited Partner Interests)	Award	2.02%	1,037	52,313	14 Nov 2025	Direct
Frank M. Semple	MPLX	Common Units (Limited Partner Interests)	Award	2.02%	1,132	57,101	14 Nov 2025	Direct
Garry L. Peiffer	MPLX	Common Units (Limited Partner Interests)	Award	2.02%	1,247	62,892	14 Nov 2025	Direct
Christopher A. Helms	MPLX	Common Units (Limited Partner Interests)	Award	1.74%	1,358	79,466	14 Nov 2025	Direct
Christine S. Breves	MPLX	Common Units (Limited Partner Interests)	Award	2.02%	230	11,619	14 Nov 2025	Direct
Ray N. Walker Jr.	MPLX	Common Units (Limited Partner Interests)	Award		1,678	1,678	25 Aug 2025	Direct
John P. Surma	MPLX	Common Units (Limited Partner Interests)	Award	1.74%	1,475	86,095	15 Aug 2025	Direct
J. Michael Stice	MPLX	Common Units (Limited Partner Interests)	Award	1.91%	962	51,276	15 Aug 2025	Direct
Frank M. Semple	MPLX	Common Units (Limited Partner Interests)	Award	1.91%	1,051	55,968	15 Aug 2025	Direct
Garry L. Peiffer	MPLX	Common Units (Limited Partner Interests)	Award	1.91%	1,157	61,645	15 Aug 2025	Direct
Christopher A. Helms	MPLX	Common Units (Limited Partner Interests)	Award	1.64%	1,260	78,108	15 Aug 2025	Direct
Christine S. Breves	MPLX	Common Units (Limited Partner Interests)	Award	1.91%	214	11,389	15 Aug 2025	Direct
John P. Surma	MPLX	Common Units (Limited Partner Interests)	Award	1.67%	1,390	84,620	16 May 2025	Direct
J. Michael Stice	MPLX	Common Units (Limited Partner Interests)	Award	1.84%	907	50,313	16 May 2025	Direct
Frank M. Semple	MPLX	Common Units (Limited Partner Interests)	Award	1.84%	990	54,918	16 May 2025	Direct
Garry L. Peiffer	MPLX	Common Units (Limited Partner Interests)	Award	1.84%	1,090	60,488	16 May 2025	Direct
Christopher A. Helms	MPLX	Common Units (Limited Partner Interests)	Award	1.57%	1,187	76,849	16 May 2025	Direct
Christine S. Breves	MPLX	Common Units (Limited Partner Interests)	Award	1.84%	201	11,175	16 May 2025	Direct
John P. Surma	MPLX	Common Units (Limited Partner Interests)	Award	3.54%	2,848	83,229	01 May 2025	Direct
J. Michael Stice	MPLX	Common Units (Limited Partner Interests)	Award	6.12%	2,848	49,406	01 May 2025	Direct
Frank M. Semple	MPLX	Common Units (Limited Partner Interests)	Award	5.58%	2,848	53,928	01 May 2025	Direct
Garry L. Peiffer	MPLX	Common Units (Limited Partner Interests)	Award	4.36%	2,481	59,397	01 May 2025	Direct
Christopher A. Helms	MPLX	Common Units (Limited Partner Interests)	Award	3.39%	2,481	75,661	01 May 2025	Direct
Christine S. Breves	MPLX	Common Units (Limited Partner Interests)	Award	29.2%	2,481	10,974	01 May 2025	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.