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Heartland Advisors
> NADX
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 03/31/2010 | NATIONAL DENTEX CORP /MA/ | NADX | 524,682 | 0 | 5,142,000 | -157,000 | $9.80 |
| 12/31/2009 | NATIONAL DENTEX CORP /MA/ | NADX | 524,682 | 0 | 5,299,000 | 829,000 | $10.10 |
| 09/30/2009 | NATIONAL DENTEX CORP /MA/ | NADX | 524,682 | 0 | 4,470,000 | 1,054,000 | $8.52 |
| 06/30/2009 | NATIONAL DENTEX CORP /MA/ | NADX | 524,682 | 0 | 3,416,000 | 1,375,000 | $6.51 |
| 03/31/2009 | NATIONAL DENTEX CORP /MA/ | NADX | 524,682 | 0 | 2,041,000 | -346,000 | $3.89 |
| 12/31/2008 | NATIONAL DENTEX CORP /MA/ | NADX | 524,682 | 0 | 2,387,000 | -814,000 | $4.55 |
| 09/30/2008 | NATIONAL DENTEX CORP /MA/ | NADX | 524,682 | -5,318 | 3,201,000 | -3,498,000 | $6.10 |
| 06/30/2008 | NATIONAL DENTEX CORP /MA/ | NADX | 530,000 | 89,250 | 6,699,000 | 1,018,000 | $12.64 |
| 03/31/2008 | NATIONAL DENTEX CORP /MA/ | NADX | 440,750 | 0 | 5,681,000 | -1,424,000 | $12.89 |
| 12/31/2007 | NATIONAL DENTEX CORP /MA/ | NADX | 440,750 | 119,797 | 7,105,000 | 2,011,000 | $16.12 |
| 09/30/2007 | NATIONAL DENTEX CORP /MA/ | NADX | 320,953 | 268,490 | 5,094,000 | 4,109,000 | $15.87 |
| 06/30/2007 | NATIONAL DENTEX CORP /MA/ | NADX | 52,463 | 52,463 | 985,000 | 985,000 | $18.78 |
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