There is significant interest inPSX by institutional investors. The 71.49% of outstanding shares they control represents a greater percentage of ownership than at any other company in the Oil Refining/Marketing industry. Additionally, during the quarter ended March 2013, these large investors purchased a net $4.9 million shares.
| Other institutional | 38.41% |
| Mutual fund holders | 33.08% |
| Individual stakeholders | 0.05% |