MPLX Lp MPLX NYSE

NYSE • Energy • Oil & Gas Midstream • US • USD

SharesGrow Score

69/100

4/7 Pass

SharesGrow Intrinsic Value

MPLX Lp (MPLX) has 20 known insider and institutional holders on record. The largest holder is Marathon Petroleum Corp with 647,415,452 shares. Other notable holders include ANDEAVOR LLC and MARKWEST HYDROCARBON L.L.C..

Over the last 12 months, insiders have made 51 transactions in MPLX stock — 39 buys (valued at RSU Award) and 0 sells (valued at RSU Award). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.

MPLX Insider Ownership

Top Holder

Marathon Petroleum Corp

647,415,452 shares

Buys (12 mo)

$0.00 value

Sells (12 mo)

$0.00 value

12-Month Transaction Activity

Buy 76%

Sell 0%

Top Insider Holders

#	Name	Role	Shares Owned	Last Filed	Relative Size
1	Marathon Petroleum Corp	10 Percent Owner	647,415,452	2020-08-04	100%
2	Andeavor Llc	10 Percent Owner	504,701,934	2019-08-01	78%
3	Markwest Hydrocarbon L.l.c.	10 Percent Owner	28,554,313	2016-09-06	4%
4	Mplx Holdings Inc.	10 Percent Owner	28,554,313	2016-09-06	4%
5	Mollenkopf John C	Exec VP and COO	413,452	2015-12-22	0%
6	Goff Gregory James	Director	385,168	2019-12-18	0%
7	Hennigan Michael J	Executive Chairman	359,137	2025-12-16	0%
8	Buese Nancy	Exec VP and CFO	182,779	2016-09-27	0%
9	Mannen Maryann T.	Chairman, President & CEO	178,679	2026-03-03	0%
10	Nickerson Randy S	Exec VP and Cco	177,552	2017-03-16	0%
11	Sandman Dan D	Director	127,542	2023-04-05	0%
12	Heminger Gary R.	Director	126,695	2020-03-04	0%
13	Bromley C Corwin	Exec. VP and Gen Counsel	123,705	2017-09-15	0%
14	Floerke Gregory Scott	Exec. VP and COO	98,229	2026-03-03	0%
15	Surma John P	Director	89,190	2026-02-19	0%
16	Templin Donald C.	Director	81,538	2021-11-23	0%
17	Helms Christopher A	Director	80,751	2026-02-19	0%
18	Gagle Suzanne	General Counsel	67,205	2023-12-05	0%
19	Peiffer Garry L.	Director	64,072	2026-02-19	0%
20	Semple Frank M	Director	58,172	2026-02-19	0%

Recent Transactions (last 12 months)

Date	Name	Role	Type	Shares	Price	Value
2026-04-01	Brzezinski Erin M	VP and Controller	Unknown	-	-	-
2026-03-01	Khoury Maria A	Director	RSU Award	8,451	-	-
2026-03-02	Benson Molly R	Chief Legal Ofc & Corp Sec	Tax Withholding of RSU	998	$59.22	$59.1K
2026-03-01	Benson Molly R	Chief Legal Ofc & Corp Sec	RSU Award	8,803	-	-
2026-03-02	Lyon Shawn M	Senior VP, Log. & Storage	Tax Withholding of RSU	798	$59.22	$47.26K
2026-03-01	Lyon Shawn M	Senior VP, Log. & Storage	RSU Award	5,986	-	-
2026-03-02	Hagedorn Carl Kristopher	Exec VP & Chief Fin Ofc	Tax Withholding of RSU	663	$59.22	$39.26K
2026-03-01	Hagedorn Carl Kristopher	Exec VP & Chief Fin Ofc	RSU Award	4,930	-	-
2026-03-02	Mannen Maryann T.	Chairman, President & CEO	Tax Withholding of RSU	6,409	$59.22	$379.54K
2026-03-01	Mannen Maryann T.	Chairman, President & CEO	RSU Award	52,817	-	-
2026-03-02	Floerke Gregory Scott	Exec. VP and COO	Tax Withholding of RSU	797	$59.22	$47.2K
2026-03-01	Floerke Gregory Scott	Exec. VP and COO	RSU Award	5,986	-	-
2026-02-17	Breves Christine S	Director	RSU Award	218	-	-
2026-02-17	Peiffer Garry L.	Director	RSU Award	1,181	-	-
2026-02-17	Stice J Michael	Director	RSU Award	982	-	-
2026-02-17	Walker Ray N Jr	Director	RSU Award	32	-	-
2026-02-17	Semple Frank M	Director	RSU Award	1,072	-	-
2026-02-17	Surma John P	Director	RSU Award	1,505	-	-
2026-02-17	Helms Christopher A	Director	RSU Award	1,285	-	-
2026-01-19	Khoury Maria A	Director	Unknown	-	-	-
2025-12-12	Benson Molly R	Chief Legal Ofc & Corp Sec	Tax Withholding of RSU	306	$54.85	$16.78K
2025-12-12	Lyon Shawn M	Senior VP, Log. & Storage	Tax Withholding of RSU	245	$54.85	$13.44K
2025-12-12	Hennigan Michael J	Executive Chairman	Tax Withholding of RSU	1,335	$54.85	$73.22K
2025-12-12	Floerke Gregory Scott	Exec. VP and COO	Tax Withholding of RSU	242	$54.85	$13.27K
2025-11-14	Breves Christine S	Director	RSU Award	230	-	-