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PADCO ADVISORS INC /MD NEW
> NATI
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 12/31/2010 | NATIONAL INSTRUMENTS CORP | NATI | 0 | -1,150 | 0 | -37,000 | |
| 09/30/2010 | NATIONAL INSTRUMENTS CORP | NATI | 0 | -1,150 | 0 | -37,000 | |
| 09/30/2010 | NATIONAL INSTRUMENTS CORP | NATI | 0 | -1,150 | 0 | -37,000 | |
| 06/30/2010 | NATIONAL INSTRUMENTS CORP | NATI | 1,150 | 430 | 37,000 | 16,000 | $32.17 |
| 03/31/2010 | NATIONAL INSTRUMENTS CORP | NATI | 1,440 | 720 | 48,000 | 27,000 | $33.33 |
| 12/31/2009 | NATIONAL INSTRUMENTS CORP | NATI | 720 | 160 | 21,000 | 6,000 | $29.17 |
| 09/30/2009 | NATIONAL INSTRUMENTS CORP | NATI | 560 | -410 | 15,000 | -7,000 | $26.79 |
| 06/30/2009 | NATIONAL INSTRUMENTS CORP | NATI | 970 | 360 | 22,000 | 11,000 | $22.68 |
| 03/31/2009 | NATIONAL INSTRUMENTS CORP | NATI | 610 | -5,760 | 11,000 | -144,000 | $18.03 |
| 12/31/2008 | NATIONAL INSTRUMENTS CORP | NATI | 6,370 | 6,370 | 155,000 | 155,000 | $24.33 |
| 09/30/2008 | NATIONAL INSTRUMENTS CORP | NATI | 910 | 520 | 27,000 | 16,000 | $29.67 |
| 06/30/2008 | NATIONAL INSTRUMENTS CORP | NATI | 390 | -4,560 | 11,000 | -118,000 | $28.21 |
| 03/31/2008 | NATIONAL INSTRUMENTS CORP | NATI | 4,950 | 2,220 | 129,000 | 38,000 | $26.06 |
| 12/31/2007 | NATIONAL INSTRUMENTS CORP | NATI | 2,730 | 2,730 | 91,000 | 91,000 | $33.33 |
| 06/30/2007 | NATIONAL INSTRUMENTS CORP | NATI | 0 | -3,978 | 0 | -104,000 | |
| 03/31/2007 | NATIONAL INSTRUMENTS CORP | NATI | 3,978 | -3,980 | 104,000 | -113,000 | $26.14 |
| 12/31/2006 | NATIONAL INSTRUMENTS CORP | NATI | 7,958 | 2,080 | 217,000 | 56,000 | $27.27 |
| 09/30/2006 | NATIONAL INSTRUMENTS CORP | NATI | 5,878 | 5,878 | 161,000 | 161,000 | $27.39 |
| 06/30/2006 | NATIONAL INSTRUMENTS CORP | NATI | 1,680 | -2,720 | 46,000 | -98,000 | $27.38 |
| 03/31/2006 | NATIONAL INSTRUMENTS CORP | NATI | 4,400 | -880 | 144,000 | -25,000 | $32.73 |
| 12/31/2005 | NATIONAL INSTRUMENTS CORP | NATI | 5,280 | -354 | 169,000 | 30,000 | $32.01 |
| 09/30/2005 | NATIONAL INSTRUMENTS CORP | NATI | 5,634 | -6,823 | 139,000 | -125,000 | $24.67 |
| 06/30/2005 | NATIONAL INSTRUMENTS CORP | NATI | 12,457 | -14,192 | 264,000 | -457,000 | $21.19 |
| 03/31/2005 | NATIONAL INSTRUMENTS CORP | NATI | 26,649 | 13,526 | 721,000 | 363,000 | $27.06 |
| 12/31/2004 | NATIONAL INSTRUMENTS CORP | NATI | 13,123 | -4,041 | 358,000 | -162,000 | $27.28 |
| 09/30/2004 | NATIONAL INSTRUMENTS CORP | NATI | 17,164 | -279 | 520,000 | -15,000 | $30.30 |
| 06/30/2004 | NATIONAL INSTRUMENTS CORP | NATI | 17,443 | 9,928 | 535,000 | 299,000 | $30.67 |
| 03/31/2004 | NATIONAL INSTRUMENTS CORP | NATI | 7,515 | -4,715 | 236,000 | -320,000 | $31.40 |
| 12/31/2003 | NATIONAL INSTRUMENTS CORP | NATI | 12,230 | 930 | 556,000 | 101,000 | $45.46 |
| 09/30/2003 | NATIONAL INSTRUMENTS CORP | NATI | 11,300 | 9,500 | 455,000 | 387,000 | $40.27 |
| 06/30/2003 | NATIONAL INSTRUMENTS CORP | NATI | 1,800 | 800 | 68,000 | 33,000 | $37.78 |
| 03/31/2003 | NATIONAL INSTRUMENTS CORP | NATI | 1,000 | -480 | 35,000 | -13,000 | $35.00 |
| 12/31/2002 | NATIONAL INSTRUMENTS CORP | NATI | 1,480 | 1,480 | 48,000 | 48,000 | $32.43 |
| 09/30/2002 | NATIONAL INSTRUMENTS CORP | NATI | 0 | -1,930 | 0 | -63,000 | |
| 06/30/2002 | NATIONAL INSTRUMENTS CORP | NATI | 1,930 | -2,280 | 63,000 | -113,000 | $32.64 |
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