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BlackRock Investment Management, LLC
> ATCO
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 12/31/2009 | AMERICAN TECHNOLOGY CORP | ATCO | 1,700 | 0 | 3,000 | 0 | $1.76 |
| 09/30/2009 | AMERICAN TECHNOLOGY CORP | ATCO | 1,700 | 0 | 3,000 | 0 | $1.76 |
| 06/30/2009 | AMERICAN TECHNOLOGY CORP | ATCO | 1,700 | 0 | 3,000 | 2,000 | $1.76 |
| 03/31/2009 | AMERICAN TECHNOLOGY CORP | ATCO | 1,700 | 0 | 1,000 | 0 | $0.59 |
| 12/31/2008 | AMERICAN TECHNOLOGY CORP | ATCO | 1,700 | 1,700 | 1,000 | 1,000 | $0.59 |
| 09/30/2008 | AMERICAN TECHNOLOGY CORP | ATCO | 1,700 | 0 | 1,000 | -2,000 | $0.59 |
| 06/30/2008 | AMERICAN TECHNOLOGY CORP | ATCO | 1,700 | 0 | 3,000 | -1,000 | $1.76 |
| 03/31/2008 | AMERICAN TECHNOLOGY CORP | ATCO | 1,700 | 0 | 4,000 | 0 | $2.35 |
| 12/31/2007 | AMERICAN TECHNOLOGY CORP | ATCO | 1,700 | 0 | 4,000 | -2,000 | $2.35 |
| 09/28/2007 | AMERICAN TECHNOLOGY CORP | ATCO | 1,700 | 0 | 6,000 | -1,000 | $3.53 |
| 12/31/2006 | AMERICAN TECHNOLOGY CORP | ATCO | 1,700 | 0 | 7,000 | 1,000 | $4.12 |
| 09/30/2006 | AMERICAN TECHNOLOGY CORP | ATCO | 1,700 | 1,700 | 6,000 | 6,000 | $3.53 |
| 06/29/2006 | AMERICAN TECHNOLOGY CORP | ATCO | 1,700 | 0 | 6,000 | -1,000 | $3.53 |
| 03/30/2006 | AMERICAN TECHNOLOGY CORP | ATCO | 1,700 | 1,700 | 7,000 | 7,000 | $4.12 |
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