| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | Invesco Ltd. | 2,469,685 | 2.50 | $3,284,681 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 1,712,469 | 1.74 | $2,277,583 | 30-Sep-09 | | DIMENSIONAL FUND ADVISORS LP | 1,607,444 | 1.63 | $2,137,900 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 1,194,690 | 1.21 | $1,588,937 | 30-Sep-09 | | WHITEBOX ADVISORS, LLC | 688,563 | .70 | $915,788 | 30-Sep-09 | | NORTHERN TRUST CORPORATION | 590,516 | .60 | $454,697 | 30-Jun-09 | | MARXE, AUSTIN W. & GREENHOUSE, DAVID M. | 298,443 | .30 | $396,929 | 30-Sep-09 | | GEODE CAPITAL MANAGEMENT, LLC | 267,891 | .27 | $356,295 | 30-Sep-09 | | CITIGROUP INC. | 261,690 | .27 | $348,047 | 30-Sep-09 | | CALPERS (CALIFORNIA-PUBLIC EMPLOYEES RETIREMENT SYSTEM) | 238,167 | .24 | $183,388 | 30-Jun-09 |
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| Holder | Shares | % Out | Value* | Reported | | Powershares Exhg Traded Fd Tr-POWERSHARES WILDERHILL CLEAN E | 5,213,260 | 5.29 | $3,545,016 | 31-Jul-09 | | VANGUARD TOTAL STOCK MARKET INDEX FUND | 884,376 | .90 | $680,969 | 30-Jun-09 | | VANGUARD EXTENDED MARKET INDEX FUND | 610,340 | .62 | $469,961 | 30-Jun-09 | | DFA U.S. MICRO CAP SERIES | 459,583 | .47 | $330,899 | 30-Apr-09 | | DFA U.S. SMALL CAP VALUE SERIES | 418,216 | .42 | $301,115 | 30-Apr-09 | | SPARTAN EXTENDED MARKET INDEX FUND | 237,013 | .24 | $315,227 | 30-Sep-09 | | DFA U.S. SMALL CAP SERIES | 125,796 | .13 | $90,573 | 30-Apr-09 | | VANGUARD INSTITUTIONAL INDEX-INST TOTAL STOCK MARKET IND | 106,553 | .11 | $85,242 | 31-Mar-09 | | COLLEGE RETIREMENT EQUITIES FUND-SOCIAL CHOICE ACCOUNT | 74,722 | .08 | $57,535 | 30-Jun-09 | | VANGUARD BALANCED INDEX FUND | 63,300 | .06 | $48,741 | 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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