Institutional investors hold a majority ownership of MPC through the 82.95% of the outstanding shares that they control. This interest is also higher than at almost any other company in the Oil Refining/Marketing industry. Last, during the quarter ended June 2014, these large investors purchased a net $3.6 million shares.
Mutual fund holders
Largest Quarterly Institutional Transactions
Latest Institutional Activity
STATE STREET GLOBAL ADVISORS LTD... Bought 1.2 Million shares of Marathon Petroleum Corp