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MPLX LP MPLX

US equityMarket cap rank #272
$58.30
−$0.51 (-0.87%)
Market open · Sep 24, 2:00 pm ET
After hours $58.50 -0.53%
Open$58.69
Prev close$58.81
Day range$58.00 – $59.08
Volume660.2K
Market cap$59.11B
P/E (TTM)12.5
Dividend yield7.18%

Ownership & positioning

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

Institutional ownership83.3%-0.15 pts vs. prior quarter
Institutions holding670-1 vs. prior quarter
Insider trades (recent)7 buys / 0 sellsNet buying
Short interest0.72% of floatDays to cover 7.0 · as of 31 Aug 2026
Short-sale volume share19.3%5-day average of daily volume

Short-sale volume as % of daily volume

10%16%21%27%Aug '26Sep '26Sep '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$11.67M (13 inflow days, 7 outflow days).

Largest holders

  • Marathon Petroleum Corporation63.86%
  • ALPS Advisors, Inc.2.82%
  • Invesco Ltd.1.80%
  • Harvest Fund Advisors LLC1.28%
  • Tortoise Capital Advisors, L.L.C.1.04%

By investor type

  • Public Company65.55%
  • Mutual Fund16.14%
  • VC/PE Fund0.72%
  • Private Company0.60%
  • Individual/Insider0.15%
  • Family Office/Trust0.11%
  • Hedge Fund0.11%
  • Government Pension Fund0.04%
Institutional holders670
Institutional ownership83.3%

Insider activity

Total transactions15
Bought7
Sold0

Short interest

Report dateShares short% of floatDays to cover
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
15 Jul 2026 7,106,766 0.7% 5.7
30 Jun 2026 5,979,529 0.6% 4.3
15 Jun 2026 6,647,807 0.7% 4.4
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