| 2013-08-23 | Sale | National Research Corporation NRC | director | 4,798 0.0397% | $33.11 | $158,869 | -1.75% | |
| 2012-05-04 | Sale | National Research Corporation NRC | director | 2,356 0.0664% | $48.33 | $113,867 | +0.97% | |
| 2010-12-13 | National Research Corporation NRC | director | 2,000 0.0351% | $29.07 | $58,140 | +1.44% | ||
| 2010-09-13 | National Research Corporation NRC | director | 2,000 0.0317% | $26.50 | $53,000 | +0.4% | ||
| 2009-10-02 | Sale | National Research Corporation NRC | director | 4,356 0.0651% | $23.80 | $103,656 | +2.8% | |
| 2009-04-07 | Sale | National Research Corporation NRC | director | 2,600 0.0492% | $24.85 | $64,622 | +20.26% | |
| 2008-12-23 | Sale | National Research Corporation NRC | director | 2,000 0.0459% | $28.40 | $56,791 | +16.22% | |
| 2008-12-19 | Sale | National Research Corporation NRC | director | 1,200 0.0286% | $28.11 | $33,729 | +21.71% | |
| 2008-12-18 | Sale | National Research Corporation NRC | director | 2,800 0.0653% | $27.76 | $77,731 | +20.75% | |
| 2008-12-16 | Sale | National Research Corporation NRC | director | 4,000 0.0955% | $27.50 | $110,020 | +24.62% | |
| 2008-06-27 | Sale | National Research Corporation NRC | director | 2,000 0.0385% | $28.48 | $56,970 | -8.89% | |
| 2008-05-28 | Sale | National Research Corporation NRC | director | 2,000 0.0385% | $29.52 | $59,048 | -12.04% | |
| 2008-05-23 | Sale | National Research Corporation NRC | director | 4,748 0.0921% | $29.65 | $140,795 | -11.87% | |
| 2008-05-22 | Sale | National Research Corporation NRC | director | 52 0.001% | $29.75 | $1,547 | -12.61% | |
| 2008-02-26 | Sale | National Research Corporation NRC | director | 3,200 0.0531% | $26.27 | $84,072 | -8.23% | |
| 2008-02-22 | Sale | National Research Corporation NRC | director | 2,400 0.0387% | $26.25 | $63,000 | -10.48% | |
| 2008-02-21 | Sale | National Research Corporation NRC | director | 1,998 0.033% | $26.25 | $52,440 | -8.41% | |
| 2008-02-15 | Sale | National Research Corporation NRC | director | 5,602 0.0915% | $26.88 | $150,607 | -11.39% | |
| 2007-09-14 | National Research Corporation NRC | director | 1,008 0.0162% | $25.14 | $25,341 | -1.6% | ||
| 2007-08-30 | National Research Corporation NRC | director | 600 0.0098% | $24.99 | $14,994 | +0.67% |