MARATHON PETROLEUM CORP (MPC) Institutional Ownership and Insiders Activity

MARATHON PETROLEUM CORP (MPC) is widely held by institutional investors, with 1905 firms reporting positions valued at approximately $54.92B based on SEC Form 13F filings for the quarter ended June 30, 2026.

Blackrock, Inc. is the largest disclosed holder, reporting approximately $6.65B in MPC holdings in its latest filing.

Recent insider activity includes 8 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.