There is significant interest inDO by institutional investors. The 100.61% of outstanding shares they control represents a greater percentage of ownership than at any other company in the Contract Drilling industry. Additionally, during the quarter ended March 2013, these large investors purchased a net $1.1 million shares.
| Other institutional | 75.40% |
| Individual stakeholders | 50.45% |
| Mutual fund holders | 25.21% |