| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | WELLINGTON MANAGEMENT COMPANY, LLP | 4,042,021 | 5.65 | $102,748,173 | 30-Sep-09 | | Matrix VI Management Co., L.L.C. | 2,588,742 | 3.62 | $65,805,821 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 2,161,799 | 3.02 | $54,952,930 | 30-Sep-09 | | ALGER (FRED) MANAGEMENT INC | 2,156,406 | 3.01 | $54,815,840 | 30-Sep-09 | | BROOKSIDE CAPITAL MANAGEMENT, LLC | 2,043,539 | 2.86 | $51,946,761 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 2,003,127 | 2.80 | $50,919,488 | 30-Sep-09 | | Highland Management Partners V, Inc. | 1,649,058 | 2.30 | $41,919,054 | 30-Sep-09 | | FMR LLC | 10,732,577 | 15.00 | $272,822,107 | 30-Sep-09 | | North Bridge Venture Management IV, L.P. | 10,542,721 | 14.73 | $125,774,661 | 31-Dec-08 | | Invesco Ltd. | 1,297,250 | 1.81 | $32,976,095 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | FIDELITY OTC PORTFOLIO | 3,507,500 | 4.90 | $89,160,650 | 30-Sep-09 | | FIDELITY CONTRAFUND INC | 1,870,194 | 2.61 | $47,540,331 | 30-Sep-09 | | FIDELITY DISCIPLINED EQUITY FUND (USA) | 1,300,000 | 1.82 | $33,046,000 | 30-Sep-09 | | FIDELITY SELECT PORTFOLIOS - TECHNOLOGY | 783,782 | 1.10 | $19,923,738 | 30-Sep-09 | | VANGUARD EXPLORER FUND, INC. | 768,087 | 1.07 | $18,418,726 | 31-Jul-09 | | AMERICAN CENTURY HERITAGE FUND | 750,400 | 1.05 | $19,075,168 | 30-Sep-09 | | CALAMOS GROWTH FUND | 750,000 | 1.05 | $19,065,000 | 30-Sep-09 | | Fidelity Select Portfolios-Select Communications Equipment | 632,124 | .88 | $16,068,592 | 30-Sep-09 | | AIM SMALL CAP GROWTH FUND | 631,192 | .88 | $16,044,900 | 30-Sep-09 | | FIDELITY SELECT PORTFOLIOS - WIRELESS | 586,612 | .82 | $14,911,677 | 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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