| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | Invesco Ltd. | 1,673,928 | 7.50 | $20,438,660 | 30-Sep-09 | | MARXE, AUSTIN W. & GREENHOUSE, DAVID M. | 1,118,167 | 5.01 | $13,652,819 | 30-Sep-09 | | DiamondBack Capital Management | 796,750 | 3.57 | $9,728,317 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 762,443 | 3.42 | $9,309,429 | 30-Sep-09 | | DEUTSCHE BANK AKTIENGESELLSCHAFT | 751,830 | 3.37 | $9,179,844 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 696,227 | 3.12 | $8,500,931 | 30-Sep-09 | | ESSEX INVESTMENT MANAGEMENT CO INC | 605,496 | 2.71 | $7,393,106 | 30-Sep-09 | | UBS GLOBAL ASSET MANAGEMENT (AMERICAS) INC | 576,344 | 2.58 | $7,037,160 | 30-Sep-09 | | Pictet Asset Management Ltd | 534,791 | 2.40 | $6,529,798 | 30-Sep-09 | | INGALLS & SNYDER | 515,715 | 2.31 | $6,296,880 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | Powershares Exhg Traded Fd Tr-POWERSHARES WILDERHILL CLEAN E | 1,639,531 | 7.35 | $21,576,227 | 31-Jul-09 | | ISHARES RUSSELL 2000 INDEX FD | 280,675 | 1.26 | $3,427,041 | 30-Sep-09 | | VANGUARD TOTAL STOCK MARKET INDEX FUND | 227,717 | 1.02 | $2,755,375 | 30-Jun-09 | | VANGUARD SMALL-CAP INDEX FUND | 199,865 | .90 | $2,418,366 | 30-Jun-09 | | Managers AMG Funds-Essex Small/Micro Cap Growth Fund | 173,803 | .78 | $1,936,165 | 31-Aug-09 | | BRIDGEWAY FDS INC-ULTRA SMALL COMPANY MARKET FD | 164,500 | .74 | $1,990,450 | 30-Jun-09 | | ISHARES RUSSELL 2000 GROWTH INDEX FD | 147,205 | .66 | $1,797,373 | 30-Sep-09 | | VANGUARD SMALL-CAP GROWTH INDEX FUND | 126,913 | .57 | $1,535,647 | 30-Jun-09 | | VANGUARD EXTENDED MARKET INDEX FUND | 118,919 | .53 | $1,438,919 | 30-Jun-09 | | COLLEGE RETIREMENT EQUITIES FUND-STOCK ACCOUNT | 96,424 | .43 | $1,166,730 | 30-Jun-09 |
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Value shown is computed using the security's price on the report date given.
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