Institutional investors hold a majority ownership of MRO through the 83.00% of the outstanding shares that they control. This interest is also higher than at almost any other company in the Oil & Gas Production industry. Last, during the quarter ended December 2012, these large investors purchased a net $2.2 million shares.
| Mutual fund holders | 42.41% |
| Other institutional | 40.59% |
| Individual stakeholders | 0.39% |