| Top Holders
| | | Shares Held | % O/S | Share Change | Filing Date | | Little (Roger G) | 2,138,205 | 23.2 | 0 | 03/01/13 | | Royce & Associates, LLC | 623,720 | 6.8 | 72,046 | 03/31/13 | | Baird Investment Management | 168,527 | 1.8 | 0 | 03/31/13 | | Dimensional Fund Advisors, LP | 157,380 | 1.7 | -520 | 03/31/13 | | Little (Mark C) | 106,675 | 1.2 | 0 | 03/01/13 | | The Vanguard Group, Inc. | 69,782 | 0.8 | 0 | 03/31/13 | | California Public Employees' Retirement System | 39,300 | 0.4 | 0 | 03/31/13 | | Renaissance Technologies Corp. | 27,300 | 0.3 | 300 | 03/31/13 | | Henseler (Udo) | 19,420 | 0.2 | 19,420 | 03/01/13 | | Northern Trust Investments, N.A. | 16,166 | 0.2 | 0 | 03/31/13 |
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