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Boston Partners
> PLUG
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 03/31/2013 | PLUG POWER INC | PLUG | 0 | -3,573,185 | 0 | -1,787,000 | |
| 12/31/2012 | PLUG POWER INC | PLUG | 3,573,185 | 0 | 1,787,000 | -1,188,000 | $0.50 |
| 09/30/2012 | PLUG POWER INC | PLUG | 3,573,185 | 0 | 2,975,000 | -1,098,000 | $0.83 |
| 06/30/2012 | PLUG POWER INC | PLUG | 3,573,185 | 0 | 4,073,000 | -608,000 | $1.14 |
| 03/31/2012 | PLUG POWER INC | PLUG | 3,573,185 | 1,992,200 | 4,681,000 | 1,456,000 | $1.31 |
| 12/31/2011 | PLUG POWER INC | PLUG | 1,580,985 | 355,735 | 3,225,000 | 983,000 | $2.04 |
| 09/30/2011 | PLUG POWER INC | PLUG | 1,225,250 | 1,225,250 | 2,242,000 | 2,242,000 | $1.83 |
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