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BERKSHIRE ASSET MANAGEMENT LLC
> LSR
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 03/31/2010 | LIFE SCIENCES RESEARCH INC | LSR | 20,179 | 7,133 | 1,346,000 | 267,000 | $66.70 |
| 12/31/2009 | LIFE SCIENCES RESEARCH INC | LSR | 13,046 | 13,046 | 1,079,000 | 1,079,000 | $82.71 |
| 12/31/2008 | LIFE SCIENCES RESEARCH INC | LSR | 0 | -49,045 | 0 | -1,761,000 | |
| 09/30/2008 | LIFE SCIENCES RESEARCH INC | LSR | 49,045 | 49,045 | 1,761,000 | 1,761,000 | $35.91 |
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