Stocks › Oil & Gas Midstream › MPLX

MPLX LP MPLX

US equityMarket cap rank #389Oil & Gas Midstream

$55.91 +$0.57 (+1.03%)

Market closed · Nov 6, 8:10 pm ET · Last extended-hours $56.03 +0.21%

Open$55.39

Prev close$55.34

Day range$55.03 – $56.06

Volume1.91M

Market cap$56.64B

P/E (TTM)13.1

Dividend yield7.70%

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership83.4%-0.61 pts vs. prior quarter

Institutions holding665+1 vs. prior quarter

Insider trades (recent)39 buys / 9 sellsNet buying

Short interest0.64% of floatDays to cover 5.2 · as of 15 Oct 2026

Short-sale volume share20.7%5-day average of daily volume

Short-sale volume as % of daily volume

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$1.63M (12 inflow days, 8 outflow days).

Net flow by order size, last 20 sessions

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 71.0% of shares outstanding.

Largest holders

Marathon Petroleum Corporation63.86%
ALPS Advisors, Inc.3.00%
Invesco Ltd.1.80%
Harvest Fund Advisors LLC1.28%
Tortoise Capital Advisors, L.L.C.1.04%
Goldman Sachs Asset Management, L.P.0.96%
Mirae Asset Global Investments Co., Ltd0.79%
Kayne Anderson Capital Advisors, L.P.0.58%

By investor type

Public Company65.55%
Mutual Fund16.27%
VC/PE Fund0.72%
Private Company0.60%
Individual/Insider0.15%
Family Office/Trust0.11%
Hedge Fund0.11%
Government Pension Fund0.04%

Reported short interest has fallen from 0.76% to 0.64% of float over the last 6 biweekly reports (31 Jul 2026 to 15 Oct 2026).

Recent institutional activity

Holder	Type	Period	Share change	New stake
BlackRock	Mutual Fund	2026/Q3	+91,246	0.0%
ALPS Advisors, Inc.	Mutual Fund	2026/Q3	+1,530,630	2.8%
Hudson River Trading LLC	Private Company	2026/Q3	+748,114	0.1%
Mirae Asset Global Investments Co., Ltd	Mutual Fund	2026/Q3	+692,332	0.8%
Arax Advisory Partners, LLC	Mutual Fund	2026/Q3	+594,312	0.1%
Mizuho Financial Group, Inc.	Public Company	2026/Q3	+575,000	0.1%
FMR	Mutual Fund	2026/Q3	+560,024	0.4%
Recurrent Investment Advisors LLC	Mutual Fund	2026/Q3	+544,714	0.1%
Royal Bank of Canada	Public Company	2026/Q3	+478,480	0.2%
CIBC World Markets Corp.	Private Company	2026/Q3	+310,924	0.2%
Cohen & Steers Capital Management, Inc.	Mutual Fund	2026/Q3	+248,907	0.1%
Morgan Stanley Investment Management Inc.	Mutual Fund	2026/Q3	+240,391	0.2%
Energy Income Partners LLC	Mutual Fund	2026/Q3	+222,817	0.5%
Citadel Advisors LLC	Hedge Fund	2026/Q3	+203,901	0.0%
NEOS Investment Management, LLC	Mutual Fund	2026/Q3	+152,041	0.0%

Institutional buy/sell activity by reporting period, largest moves first.

Insider transactions

Date	Insider	Title	Transaction	Shares	Price	Held after
13 Aug 2026	Christopher Helms	Lead Independent Director of MPLX GP LLC	Other Acquisition	+1,336	–	86,208
13 Aug 2026	Frank Semple	Independent Director of MPLX GP LLC	Other Acquisition	+1,072	–	63,476
13 Aug 2026	John Surma	Independent Director of MPLX GP LLC	Other Acquisition	+1,563	–	95,448
13 Aug 2026	Christine Breves	Independent Director of MPLX GP LLC	Other Acquisition	+218	–	15,038
13 Aug 2026	Ray Walker	Independent Director of MPLX GP LLC	Other Acquisition	+81	–	4,609
13 Aug 2026	Garry Peiffer	Independent Non-Executive Director of MPLX GP LLC	Other Acquisition	+1,232	–	137,810
13 Aug 2026	John Stice	Independent Non-Executive Director of MPLX GP LLC	Other Acquisition	+982	–	59,113
14 May 2026	Christopher Helms	Lead Independent Director of MPLX GP LLC	Other Acquisition	+1,415	–	84,413
14 May 2026	Frank Semple	Independent Director of MPLX GP LLC	Other Acquisition	+1,194	–	61,946
14 May 2026	John Surma	Independent Director of MPLX GP LLC	Other Acquisition	+1,656	–	93,426
14 May 2026	Christine Breves	Independent Director of MPLX GP LLC	Other Acquisition	+276	–	14,361
14 May 2026	Ray Walker	Independent Director of MPLX GP LLC	Other Acquisition	+78	–	4,069
14 May 2026	Garry Peiffer	Independent Non-Executive Director of MPLX GP LLC	Other Acquisition	+1,303	–	136,120
14 May 2026	John Stice	Independent Non-Executive Director of MPLX GP LLC	Other Acquisition	+1,098	–	57,673
29 Apr 2026	Christopher Helms	Lead Independent Director of MPLX GP LLC	Other Acquisition	+2,696	–	83,447
29 Apr 2026	Frank Semple	Independent Director of MPLX GP LLC	Other Acquisition	+3,028	–	61,201
29 Apr 2026	John Surma	Independent Director of MPLX GP LLC	Other Acquisition	+3,028	–	92,219
29 Apr 2026	Christine Breves	Independent Director of MPLX GP LLC	Other Acquisition	+2,696	–	14,534
29 Apr 2026	Ray Walker	Independent Director of MPLX GP LLC	Other Acquisition	+2,696	–	4,440
29 Apr 2026	Garry Peiffer	Independent Non-Executive Director of MPLX GP LLC	Other Acquisition	+2,696	–	135,266

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report date	Shares short	% of float	Days to cover
15 Oct 2026	6,482,303	0.6%	5.2
30 Sep 2026	6,685,785	0.7%	4.2
15 Sep 2026	6,632,787	0.7%	5.4
31 Aug 2026	7,346,297	0.7%	7.0
14 Aug 2026	7,459,259	0.7%	4.7
31 Jul 2026	7,680,934	0.8%	4.5

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