| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | BAMCO INC. | 4,294,519 | 6.84 | $62,785,867 | 30-Sep-09 | | MORGAN STANLEY | 3,871,981 | 6.17 | $56,608,362 | 30-Sep-09 | | PRICE (T.ROWE) ASSOCIATES INC | 2,686,910 | 4.28 | $39,282,624 | 30-Sep-09 | | STANDARD LIFE INVESTMENTS (USA) LIMITED | 1,307,600 | 2.08 | $19,117,112 | 30-Sep-09 | | General Atlantic LLC | 12,266,332 | 19.53 | $179,333,773 | 30-Sep-09 | | Technology Crossover Management V, L.L.C. | 6,424,802 | 10.23 | $93,930,605 | 30-Sep-09 | | JANUS CAPITAL MANAGEMENT, LLC | 1,221,836 | 1.95 | $17,863,242 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 1,192,900 | 1.90 | $17,440,198 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 1,119,872 | 1.78 | $16,372,528 | 30-Sep-09 | | WADDELL & REED FINANCIAL INC. | 1,060,301 | 1.69 | $15,501,600 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | BARON GROWTH FUND | 2,500,000 | 3.98 | $44,150,000 | 30-Jun-09 | | MORGAN STANLEY INST FD INC-SMALL COMPANY GROWTH PORT | 2,035,167 | 3.24 | $35,941,049 | 30-Jun-09 | | PRICE (T.ROWE) NEW HORIZONS FUND | 1,457,800 | 2.32 | $21,313,036 | 30-Sep-09 | | BARON SMALL CAP FUND | 1,000,000 | 1.59 | $17,660,000 | 30-Jun-09 | | PRICE (T.ROWE) SMALL CAP STOCK FUND | 500,000 | .80 | $7,310,000 | 30-Sep-09 | | JANUS VENTURE FUND | 472,565 | .75 | $6,908,900 | 30-Sep-09 | | BLACKROCK FUNDS-SMALL CAP GROWTH EQUITY PORTFOLIO | 450,782 | .72 | $7,960,810 | 30-Jun-09 | | VANGUARD SMALL-CAP INDEX FUND | 374,848 | .60 | $6,619,815 | 30-Jun-09 | | ISHARES RUSSELL 2000 INDEX FD | 322,778 | .51 | $4,719,014 | 30-Sep-09 | | Janus Triton Fund | 298,020 | .47 | $4,357,052 | 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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