Institutional investors control 5.79% of the outstanding shares in OPXA. This represents a greater percentage of ownership than at almost any other company in the Biotechnology industry. Additionally, during the quarter ended March 2013, these large investors purchased a net $56.6 thousand shares.
| Individual stakeholders | 6.59% |
| Other institutional | 4.53% |
| Mutual fund holders | 1.27% |