| Ownership Summary| Top Holders
| | | Shares Held | % O/S | Share Change | Filing Date | | Dimensional Fund Advisors, LP | 3,164,463 | 5.9 | 220,711 | 03/31/13 | | Cannell Capital, LLC | 3,062,706 | 5.7 | 593,025 | 03/31/13 | | LSV Asset Management | 3,009,814 | 5.6 | 211,420 | 03/31/13 | | Kutler (Jon B) | 3,008,166 | 5.6 | 8,166 | 04/30/12 | | BlackRock Institutional Trust Company, N.A. | 1,986,497 | 3.7 | 409,434 | 03/31/13 | | The Vanguard Group, Inc. | 1,520,134 | 2.8 | -899,240 | 03/31/13 | | Renaissance Technologies Corp. | 1,028,267 | 1.9 | 215,421 | 03/31/13 | | D. E. Shaw & Co., L.P. | 872,574 | 1.6 | -38,751 | 03/31/13 | | Bridgeway Capital Management, Inc. | 722,734 | 1.4 | 93,000 | 03/31/13 | | True Bearing Asset Management, L.P. | 704,360 | 1.3 | 11,718 | 03/31/13 |
|
| Ownership data based on most recent publicly available data according to Thomson Financial. |
| |
