DOSSIER · 13F Holders · Q3 2026
MPLX LP
4 institutions still hold MPLX LP as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.
CUSIP 55336V900·4 13F holders·last filed Sep 30, 2026
AI Holders Summary · Q3 2026
4 institutions reported MPLX LP in Q3 2026. IMC-Chicago, LLC leads at 45.9% of the visible book.
Top holders
Sorted by position value. Source: SEC EDGAR 13F-HR filings.