Ticker · held by 4 filers

MPC

MARATHON PETE CORP

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

Total value held

$5.16B

Total shares

29,851,191

Filers holding

4 · 6 positions

Caveat

long only · 13F-eligible managers only

Filers holding MPC

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

# Filer Class Shares Value (USD) % of port

1 BlackRock · Larry Fink COM 28,177,087 $4.89B 0.11%

2 Citadel Advisors · Ken Griffin COM 912,252 $148.4M 0.02%

3 Citadel Advisors · Ken Griffin CALLCOM 227,200 $36.9M 0.01%

4 Bridgewater Associates · Ray Dalio (founder) COM 195,553 $31.8M 0.12%

5 Renaissance Technologies · Jim Simons (founder) COM 177,899 $28.9M 0.04%

6 Citadel Advisors · Ken Griffin PUTCOM 161,200 $26.2M 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 MPC 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