Ticker · held by 3 filers

MPLX

MPLX LP

All tracked filers currently holding MPLX, ranked by position size. Each row links through to the filer's full portfolio.

Total value held

$92.8M

Total shares

1,757,642

Filers holding

3 · 5 positions

Caveat

long only · 13F-eligible managers only

Filers holding MPLX

sorted by position size · click any filer to see their full portfolio

# Filer Class Shares Value (USD) % of port

1 Duquesne Family Office · Stanley Druckenmiller COM UNIT REP LTD 627,500 $33.5M 0.48%

2 Citadel Advisors · Ken Griffin CALLCOM UNIT REP LTD 519,800 $27.7M 0.00%

3 Citadel Advisors · Ken Griffin PUTCOM UNIT REP LTD 281,900 $15.0M 0.00%

4 Citadel Advisors · Ken Griffin COM UNIT REP LTD 236,462 $12.6M 0.00%

5 BlackRock · Larry Fink COM UNIT REP LTD 91,980 $3.9M 0.00%

What this is

This page reverses the usual 13F view: instead of "what does Buffett hold," it answers "who holds NVDA?" Across the dozen tracked filers, all current 13F-disclosed holders of MPLX are listed, with the position size and what fraction of each filer's overall portfolio it represents.

Caveats: only the filers tracked here are included (~12 names) — not the whole 13F universe (~6,000 filers). Position values are at the most recent quarter-end, not current market price. Only long positions are visible; shorts and synthetics aren't.

v0.2 · 2026 · data via SEC EDGAR · CUSIP→ticker via OpenFIGI