| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | GRUBER & MCBAINE CAPITAL MANAGEMENT LLC | 1,787,733 | 7.79 | $5,738,622 | 30-Sep-09 | | JAY, JEFFREY R. | 1,651,917 | 7.19 | $5,302,653 | 30-Sep-09 | | RENAISSANCE TECHNOLOGIES, LLC | 923,600 | 4.02 | $2,964,756 | 30-Sep-09 | | DEERFIELD MANAGEMENT | 4,393,673 | 19.13 | $14,103,690 | 30-Sep-09 | | GRT CAPITAL PARTNERS, LLC | 339,679 | 1.48 | $1,090,369 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 304,966 | 1.33 | $978,940 | 30-Sep-09 | | GMT CAPITAL CORP | 250,600 | 1.09 | $804,426 | 30-Sep-09 | | Bain Capital Venture Investors, LLC | 172,844 | .75 | $554,829 | 30-Sep-09 | | DIMENSIONAL FUND ADVISORS LP | 171,888 | .75 | $551,760 | 30-Sep-09 | | GILDER, GAGNON, HOWE & CO. | 107,207 | .47 | $344,134 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | DFA U.S. SMALL CAP VALUE SERIES | 63,412 | .28 | $102,727 | 30-Apr-09 | | VANGUARD EXTENDED MARKET INDEX FUND | 46,058 | .20 | $99,485 | 30-Jun-09 | | SPARTAN EXTENDED MARKET INDEX FUND | 7,830 | .03 | $25,134 | 30-Sep-09 | | Akros Absolute Return fund | 4,058 | .02 | $13,026 | 30-Sep-09 | | DFA U.S. Core Equity 1 Portfolio | 2,400 | .01 | $3,888 | 30-Apr-09 | | QUANTITATIVE MASTER SERIES TR-EXTENDED MARKET INDEX SERI | 1,700 | .01 | $3,672 | 30-Jun-09 | | DFA U.S. Core Equity 2 Portfolio | 1,600 | .01 | $2,592 | 30-Apr-09 | | DFA T.A. U.S. Core Equity 2 Portfolio | 900 | .00 | $1,458 | 30-Apr-09 | | FIDELITY NASDAQ COMPOSITE INDEX TRACKING STOCK | 586 | .00 | $1,881 | 30-Sep-09 | | FIDELITY NASDAQ COMPOSITE INDEX FUND | 497 | .00 | $1,595 | 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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