The current institutional shareholding score of Marathon Petroleum Corp is 7.00, ranking 25 out of 120 in the Oil & Gas industry. The latest institutional shareholding proportion is 78.63%, representing a quarter-over-quarter increase of 2.25%. The largest institutional shareholder is David G. Herro, holding a total of 2.76M shares, representing 0.96% of shares outstanding, with 0.12% decrease in holdings.