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VANGUARD GROUP INC
> ATCO
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 12/31/2009 | AMERICAN TECHNOLOGY CORP | ATCO | 550,652 | 7,100 | 815,000 | -147,000 | $1.48 |
| 09/30/2009 | AMERICAN TECHNOLOGY CORP | ATCO | 543,552 | 7,375 | 962,000 | -57,000 | $1.77 |
| 06/30/2009 | AMERICAN TECHNOLOGY CORP | ATCO | 536,177 | 0 | 1,019,000 | 622,000 | $1.90 |
| 03/31/2009 | AMERICAN TECHNOLOGY CORP | ATCO | 536,177 | 3,499 | 397,000 | -56,000 | $0.74 |
| 12/31/2008 | AMERICAN TECHNOLOGY CORP | ATCO | 532,678 | 0 | 453,000 | 160,000 | $0.85 |
| 09/30/2008 | AMERICAN TECHNOLOGY CORP | ATCO | 532,678 | 531,693 | 293,000 | -239,678 | $0.55 |
| 06/30/2008 | AMERICAN TECHNOLOGY CORP | ATCO | 985 | -175 | 532,678 | 3,200 | $540.79 |
| 03/31/2008 | AMERICAN TECHNOLOGY CORP | ATCO | 1,160 | -167 | 529,478 | 4,800 | $456.45 |
| 12/31/2007 | AMERICAN TECHNOLOGY CORP | ATCO | 1,327 | 1,327 | 524,678 | 524,678 | $395.39 |
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