| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | TPG Capital, L.P. | 7,073,260 | 9.89 | $99,520,768 | 30-Sep-09 | | AXA | 2,342,434 | 3.27 | $32,958,046 | 30-Sep-09 | | GRANAHAN INVESTMENT MANAGEMENT INC. | 2,144,250 | 3.00 | $30,169,597 | 30-Sep-09 | | JP MORGAN CHASE & COMPANY | 1,759,773 | 2.46 | $24,760,006 | 30-Sep-09 | | Capital Research Global Investors | 1,665,058 | 2.33 | $23,427,366 | 30-Sep-09 | | JANUS CAPITAL MANAGEMENT, LLC | 1,636,850 | 2.29 | $23,030,479 | 30-Sep-09 | | Greylock Equity GP Limited Partnership | 10,304,629 | 14.41 | $59,148,570 | 31-Dec-08 | | FMR LLC | 7,905,919 | 11.05 | $111,236,280 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 1,289,054 | 1.80 | $18,136,989 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 1,280,521 | 1.79 | $18,016,930 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | FIDELITY GROWTH COMPANY FUND | 5,667,919 | 7.92 | $79,747,620 | 30-Sep-09 | | VANGUARD EXPLORER FUND, INC. | 1,551,700 | 2.17 | $16,370,435 | 31-Jul-09 | | JP MORGAN SMALL CAP EQUITY FUND | 1,327,164 | 1.86 | $18,673,197 | 30-Sep-09 | | JANUS GLOBAL TECHNOLOGY FUND | 1,268,530 | 1.77 | $17,848,217 | 30-Sep-09 | | LORD ABBETT DEVELOPING GROWTH FUND | 762,400 | 1.07 | $8,043,320 | 31-Jul-09 | | AMERICAN FDS INSURANCE SER-GLOBAL SMALL CAPITALIZATION F | 706,748 | .99 | $9,943,944 | 30-Sep-09 | | FIDELITY SELECT PORTFOLIOS - TECHNOLOGY | 565,000 | .79 | $7,949,550 | 30-Sep-09 | | ISHARES RUSSELL 2000 INDEX FD | 544,018 | .76 | $7,654,333 | 30-Sep-09 | | EQ Advisors Trust-EQ/Alliance Bernstein Small Cap Growth Por | 522,109 | .73 | $4,792,960 | 30-Jun-09 | | FIDELITY OTC PORTFOLIO | 489,100 | .68 | $6,881,637 | 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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