MPLX LP (MPLX) Institutional Ownership and Insiders Activity

MPLX LP (MPLX) is widely held by institutional investors, with 628 firms reporting positions valued at approximately $10.93B based on SEC Form 13F filings for the quarter ended June 30, 2026.

Alps Advisors Inc is the largest disclosed holder, reporting approximately $1.61B in MPLX holdings in its latest filing.

Recent insider activity includes 7 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.