| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | RHO CAPITAL PARTNERS INC | 3,373,403 | 3.17 | $2,462,584 | 30-Jun-09 | | WELLINGTON MANAGEMENT COMPANY, LLP | 1,629,200 | 1.53 | $1,254,484 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 1,551,648 | 1.46 | $1,194,768 | 30-Sep-09 | | CONUS PARTNERS INC | 974,568 | .92 | $750,417 | 30-Sep-09 | | PERCEPTIVE ADVISORS LLC | 950,000 | .89 | $731,500 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 912,060 | .86 | $702,286 | 30-Sep-09 | | DIMENSIONAL FUND ADVISORS LP | 871,836 | .82 | $671,313 | 30-Sep-09 | | Marathon Capital Management | 731,900 | .69 | $563,563 | 30-Sep-09 | | BANK OF AMERICA CORPORATION | 290,151 | .27 | $223,416 | 30-Sep-09 | | CALPERS (CALIFORNIA-PUBLIC EMPLOYEES RETIREMENT SYSTEM) | 234,113 | .22 | $170,902 | 30-Jun-09 |
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| Holder | Shares | % Out | Value* | Reported | | VANGUARD TOTAL STOCK MARKET INDEX FUND | 711,245 | .67 | $519,208 | 30-Jun-09 | | VANGUARD EXTENDED MARKET INDEX FUND | 702,536 | .66 | $512,851 | 30-Jun-09 | | DFA U.S. SMALL CAP VALUE SERIES | 552,418 | .52 | $375,644 | 30-Apr-09 | | SPARTAN EXTENDED MARKET INDEX FUND | 87,639 | .08 | $67,482 | 30-Sep-09 | | VANGUARD INSTITUTIONAL INDEX-INST TOTAL STOCK MARKET IND | 60,242 | .06 | $26,506 | 31-Mar-09 | | VANGUARD BALANCED INDEX FUND | 47,497 | .04 | $34,672 | 30-Jun-09 | | SPARTAN TOTAL MARKET INDEX FUND | 20,350 | .02 | $15,669 | 30-Sep-09 | | DFA U.S. Core Equity 2 Portfolio | 16,600 | .02 | $11,288 | 30-Apr-09 | | FIDELITY NASDAQ COMPOSITE INDEX FUND | 4,370 | .00 | $3,364 | 30-Sep-09 | | FIDELITY NASDAQ COMPOSITE INDEX TRACKING STOCK | 3,931 | .00 | $3,026 | 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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