| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | FMR LLC | 2,731,400 | 8.87 | $30,673,622 | 30-Sep-09 | | FEDERATED INVESTORS, INC. | 2,710,391 | 8.80 | $30,437,690 | 30-Sep-09 | | FRONTIER CAPITAL MANAGEMENT COMPANY INC | 2,259,535 | 7.34 | $25,374,578 | 30-Sep-09 | | ORBIMED ADVISORS LLC. | 1,818,803 | 5.91 | $20,425,157 | 30-Sep-09 | | LORD ABBETT & CO | 1,667,772 | 5.42 | $18,729,079 | 30-Sep-09 | | Invesco Ltd. | 1,277,804 | 4.15 | $14,349,738 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 899,775 | 2.92 | $10,104,473 | 30-Sep-09 | | PIONEER INVESTMENT MANAGEMENT INC. | 882,940 | 2.87 | $9,915,416 | 30-Sep-09 | | DEERFIELD MANAGEMENT | 843,905 | 2.74 | $9,477,053 | 30-Sep-09 | | ALGER (FRED) MANAGEMENT INC | 3,990,203 | 12.96 | $44,809,979 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | FIDELITY GROWTH COMPANY FUND | 2,721,400 | 8.84 | $30,561,322 | 30-Sep-09 | | FEDERATED KAUFMANN FUND | 2,545,895 | 8.27 | $17,057,496 | 31-Jul-09 | | ALGER MIDCAP GROWTH INSTITUTIONAL PORTFOLIO | 793,700 | 2.58 | $5,317,790 | 31-Jul-09 | | LORD ABBETT DEVELOPING GROWTH FUND | 768,407 | 2.50 | $5,148,326 | 31-Jul-09 | | ALGER SMALL CAP GROWTH INSTITUTIONAL PORTFOLIO | 569,200 | 1.85 | $3,813,640 | 31-Jul-09 | | AIM SMALL CAP GROWTH FUND | 453,173 | 1.47 | $5,089,132 | 30-Sep-09 | | PIONEER INDEPENDENCE FUND | 442,242 | 1.44 | $3,405,263 | 30-Jun-09 | | ISHARES RUSSELL 2000 INDEX FD | 382,715 | 1.24 | $4,297,889 | 30-Sep-09 | | Pacific Select Fund-Small Cap Growth Portfolio | 353,445 | 1.15 | $2,721,526 | 30-Jun-09 | | BNY-MELLON SMALL CAP STOCK FUND | 330,100 | 1.07 | $3,707,023 | 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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