| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | QVT Financial LP | 10,116,033 | 6.15 | $8,193,986 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 5,670,499 | 3.45 | $4,593,104 | 30-Sep-09 | | HARRIS (WILLIAM) INVESTORS, INC. | 4,076,870 | 2.48 | $3,302,264 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 3,665,436 | 2.23 | $2,969,003 | 30-Sep-09 | | PRINCIPAL FINANCIAL GROUP, INC. | 3,563,000 | 2.17 | $2,886,030 | 30-Sep-09 | | JP MORGAN CHASE & COMPANY | 1,685,016 | 1.02 | $1,364,862 | 30-Sep-09 | | GRANAHAN INVESTMENT MANAGEMENT INC. | 1,207,620 | .73 | $978,172 | 30-Sep-09 | | NORTHERN TRUST CORPORATION | 845,351 | .51 | $693,187 | 30-Jun-09 | | GEODE CAPITAL MANAGEMENT, LLC | 425,566 | .26 | $344,708 | 30-Sep-09 | | PERKINS CAPITAL MANAGEMENT, INC. | 365,500 | .22 | $296,055 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | ISHARES NASDAQ BIOTECHNOLOGY INDEX FUND | 1,763,576 | 1.07 | $1,199,231 | 31-Oct-09 | | VANGUARD SMALL-CAP INDEX FUND | 1,707,701 | 1.04 | $1,400,314 | 30-Jun-09 | | VANGUARD TOTAL STOCK MARKET INDEX FUND | 1,507,184 | .92 | $1,235,890 | 30-Jun-09 | | VANGUARD VARIABLE INSURANCE FUND-SMALL COMPANY GROWTH | 1,160,900 | .71 | $951,938 | 30-Jun-09 | | VANGUARD SMALL-CAP GROWTH INDEX FUND | 1,076,422 | .65 | $882,666 | 30-Jun-09 | | VANGUARD EXTENDED MARKET INDEX FUND | 1,000,752 | .61 | $820,616 | 30-Jun-09 | | PRINCIPAL SMALL CAP GROWTH FD | 662,110 | .40 | $542,930 | 30-Jun-09 | | PRINCIPAL SMALL CAP BLEND FD | 401,100 | .24 | $328,902 | 30-Jun-09 | | SPARTAN EXTENDED MARKET INDEX FUND | 290,751 | .18 | $235,508 | 30-Sep-09 | | COLLEGE RETIREMENT EQUITIES FUND-SOCIAL CHOICE ACCOUNT | 193,980 | .12 | $159,063 | 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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