| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | KINGDON CAPITAL MANAGEMENT LLC | 4,852,041 | 6.01 | $6,307,653 | 30-Sep-09 | | KOPP INVESTMENT ADVISORS. INC. | 4,301,925 | 5.33 | $5,592,502 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 3,702,860 | 4.59 | $4,813,718 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 3,328,846 | 4.12 | $4,327,499 | 30-Sep-09 | | Invesco Ltd. | 2,926,700 | 3.63 | $3,804,710 | 30-Sep-09 | | DIMENSIONAL FUND ADVISORS LP | 1,431,347 | 1.77 | $1,860,751 | 30-Sep-09 | | STATE STREET CORPORATION | 1,297,279 | 1.61 | $1,686,462 | 30-Sep-09 | | SHAW D.E. & CO., INC. | 1,060,794 | 1.31 | $1,379,032 | 30-Sep-09 | | Socratic Fund Management, L.P. | 1,000,000 | 1.24 | $1,300,000 | 30-Sep-09 | | NORTHERN TRUST CORPORATION | 889,502 | 1.10 | $1,120,772 | 30-Jun-09 |
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| Holder | Shares | % Out | Value* | Reported | | Powershares Exhg Traded Fd Tr-POWERSHARES WILDERHILL CLEAN E | 2,929,357 | 3.63 | $3,690,989 | 31-Jul-09 | | ISHARES RUSSELL 2000 INDEX FD | 1,107,679 | 1.37 | $1,439,982 | 30-Sep-09 | | VANGUARD TOTAL STOCK MARKET INDEX FUND | 1,044,387 | 1.29 | $1,315,927 | 30-Jun-09 | | VANGUARD SMALL-CAP INDEX FUND | 915,147 | 1.13 | $1,153,085 | 30-Jun-09 | | ISHARES RUSSELL 2000 VALUE INDEX FD | 618,604 | .77 | $804,185 | 30-Sep-09 | | DFA U.S. MICRO CAP SERIES | 459,541 | .57 | $551,449 | 30-Apr-09 | | COLLEGE RETIREMENT EQUITIES FUND-STOCK ACCOUNT | 438,943 | .54 | $553,068 | 30-Jun-09 | | VANGUARD SMALL-CAP GROWTH INDEX FUND | 373,473 | .46 | $470,575 | 30-Jun-09 | | VANGUARD EXTENDED MARKET INDEX FUND | 338,597 | .42 | $426,632 | 30-Jun-09 | | Wells Fargo Advantage Small/Mid Cap Value Fd | 329,670 | .41 | $428,571 | 30-Sep-09 |
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Value shown is computed using the security's price on the report date given.
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