MPLX LP (MPLX) Institutional Ownership Changes & 13F Activity

MPLX LP (MPLX) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Brave Warrior Advisors, Appaloosa Management, Sequoia Financial Advisors, Matrix Private Capital Group, and Renaissance Technologies LLC.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Brave Warrior AdvisorsSell-1,220,5913,253,524$185,678,615
Q1 2026Appaloosa ManagementSell-125,040502,460$28,675,392
Q1 2026Sequoia Financial AdvisorsBuy5,209200,244$11,427,930
Q4 2025Appaloosa ManagementBuy92,500627,500$33,489,675
Q4 2025Brave Warrior AdvisorsBuy6,6414,474,115$238,783,518
Q4 2025Sequoia Financial AdvisorsSell-1,592195,035$10,409,030
Q3 2025Brave Warrior AdvisorsBuy192,4414,467,474$223,150,326
Q3 2025Appaloosa ManagementSell-43,500535,000$26,723,250
Q3 2025Sequoia Financial AdvisorsBuy3,359196,627$9,821,521
Q2 2025Brave Warrior AdvisorsSell-89,0534,275,033$220,206,950
Q2 2025Sequoia Financial AdvisorsBuy2,744193,268$9,955,228
Q1 2025Brave Warrior AdvisorsSell-54,0684,364,086$233,565,883
Q1 2025Sequoia Financial AdvisorsSell-28,278190,524$10,196,847
Q4 2024Sequoia Financial AdvisorsBuy24,379218,802$10,471,858
Q4 2024Brave Warrior AdvisorsSell-14,8124,418,154$211,452,850
Q3 2024Brave Warrior AdvisorsBuy197,4884,432,966$197,089,668
Q3 2024Sequoia Financial AdvisorsBuy185,402194,423$8,644,053
Q3 2024Appaloosa ManagementSell-33,000578,500$25,720,110
Q2 2024Brave Warrior AdvisorsBuy1,209,8694,235,478$180,389,008
Q2 2024Appaloosa ManagementSell-48,500611,500$26,043,785
Q1 2024Brave Warrior AdvisorsBuy3,008,6093,025,609$125,744,310
Q4 2023Appaloosa ManagementBuy477,675660,000$24,235,200
Q4 2023Brave Warrior AdvisorsBuy5,00017,000$624,240
Q2 2023Brave Warrior AdvisorsBuy12,00012,000$407,280
Q2 2023Appaloosa ManagementSell-10,000182,325$6,188,111
Q2 2023Matrix Private Capital GroupSell-4,7968,000$271,520
Q2 2022Appaloosa ManagementBuy71,945192,325$5,606
Q1 2022Appaloosa ManagementSell-399,326120,380$3,994
Q3 2021Appaloosa ManagementSell-27,300519,706$14,796
Q2 2021Appaloosa ManagementSell-394,015547,006$16,197

Frequently asked questions about MPLX activity

  • Which institutional owners are buying MPLX?

    Institutional owners buying MPLX include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in MPLX activity?

    "Buy" means an investor increased their reported position in MPLX compared to the prior reporting period. This reflects growing exposure to MPLX LP (MPLX) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in MPLX increasing?

    Institutional interest in MPLX can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.

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