Institutional investors hold a majority ownership of PWR through the 92.51% of the outstanding shares that they control. This interest is also higher than at almost any other company in the Engineering & Construction industry. Last, during the quarter ended December 2012, these large investors purchased a net $2.8 million shares.
| Individual stakeholders | 7.32% |
| Mutual fund holders | 53.01% |
| Other institutional | 39.50% |