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PERRITT CAPITAL MANAGEMENT INC
> NADX
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 03/31/2010 | NATIONAL DENTEX CORP /MA/ | NADX | 176,250 | 4,800 | 1,727,000 | -5,000 | $9.80 |
| 12/31/2009 | NATIONAL DENTEX CORP /MA/ | NADX | 171,450 | -1,350 | 1,732,000 | 261,000 | $10.10 |
| 09/30/2009 | NATIONAL DENTEX CORP /MA/ | NADX | 172,800 | 0 | 1,471,000 | 346,000 | $8.51 |
| 06/30/2009 | NATIONAL DENTEX CORP /MA/ | NADX | 172,800 | 0 | 1,125,000 | 460,000 | $6.51 |
| 03/31/2009 | NATIONAL DENTEX CORP /MA/ | NADX | 172,800 | 13,200 | 665,000 | -61,000 | $3.85 |
| 12/31/2008 | NATIONAL DENTEX CORP /MA/ | NADX | 159,600 | 159,600 | 726,000 | 726,000 | $4.55 |
| 09/30/2008 | NATIONAL DENTEX CORP /MA/ | NADX | 155,500 | 155,500 | 1,000,000 | 1,000,000 | $6.43 |
| 06/30/2008 | NATIONAL DENTEX CORP /MA/ | NADX | 154,500 | -500 | 1,959,000 | -39,000 | $12.68 |
| 03/31/2008 | NATIONAL DENTEX CORP /MA/ | NADX | 155,000 | 1,000 | 1,998,000 | -454,000 | $12.89 |
| 12/31/2007 | NATIONAL DENTEX CORP /MA/ | NADX | 154,000 | 7,350 | 2,452,000 | 106,000 | $15.92 |
| 09/30/2007 | NATIONAL DENTEX CORP /MA/ | NADX | 146,650 | 6,500 | 2,346,000 | -285,000 | $16.00 |
| 06/30/2007 | NATIONAL DENTEX CORP /MA/ | NADX | 140,150 | 2,400 | 2,631,000 | 692,000 | $18.77 |
| 03/31/2007 | NATIONAL DENTEX CORP /MA/ | NADX | 137,750 | 5,100 | 1,939,000 | -382,000 | $14.08 |
| 12/31/2006 | NATIONAL DENTEX CORP /MA/ | NADX | 132,650 | 5,954 | 2,321,000 | -169,000 | $17.50 |
| 09/30/2006 | NATIONAL DENTEX CORP /MA/ | NADX | 126,696 | 2,500 | 2,490,000 | -391,000 | $19.65 |
| 06/30/2006 | NATIONAL DENTEX CORP /MA/ | NADX | 124,196 | 1,500 | 2,881,000 | 31,000 | $23.20 |
| 03/31/2006 | NATIONAL DENTEX CORP /MA/ | NADX | 122,696 | 4,600 | 2,850,000 | 188,000 | $23.23 |
| 12/31/2005 | NATIONAL DENTEX CORP /MA/ | NADX | 118,096 | 13,300 | 2,662,000 | 514,000 | $22.54 |
| 09/30/2005 | NATIONAL DENTEX CORP /MA/ | NADX | 104,796 | 27,668 | 2,148,000 | 754,000 | $20.50 |
| 06/30/2005 | NATIONAL DENTEX CORP /MA/ | NADX | 77,128 | 7,513 | 1,394,000 | 23,000 | $18.07 |
| 03/31/2005 | NATIONAL DENTEX CORP /MA/ | NADX | 69,615 | 28,938 | 1,371,000 | 132,000 | $19.69 |
| 12/31/2004 | NATIONAL DENTEX CORP /MA/ | NADX | 40,677 | 9,577 | 1,239,000 | 363,000 | $30.46 |
| 09/30/2004 | NATIONAL DENTEX CORP /MA/ | NADX | 31,100 | -1,200 | 876,000 | -82,000 | $28.17 |
| 06/30/2004 | NATIONAL DENTEX CORP /MA/ | NADX | 32,300 | 29,520 | 958,000 | 202,000 | $29.66 |
| 03/31/2004 | NATIONAL DENTEX CORP /MA/ | NADX | 2,780 | -21,220 | 756,000 | 180,000 | $271.94 |
| 12/31/2003 | NATIONAL DENTEX CORP /MA/ | NADX | 24,000 | 24,000 | 576,000 | 576,000 | $24.00 |
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