| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | FMR LLC | 3,061,553 | 9.96 | $56,761,192 | 30-Sep-09 | | PRIMECAP MANAGEMENT COMPANY | 2,224,450 | 7.24 | $41,241,303 | 30-Sep-09 | | MASSACHUSETTS FINANCIAL SERVICES CO - OTHER | 2,037,139 | 6.63 | $37,768,557 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 1,495,314 | 4.87 | $27,723,121 | 30-Sep-09 | | Copper Rock Capital Partners LLC | 1,251,930 | 4.07 | $23,210,782 | 30-Sep-09 | | FRIESS ASSOCIATES INC | 1,224,800 | 3.99 | $22,707,792 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 1,183,754 | 3.85 | $21,946,799 | 30-Sep-09 | | LUTHER KING CAPITAL MANAGEMENT | 1,170,300 | 3.81 | $21,697,362 | 30-Sep-09 | | FEDERATED INVESTORS, INC. | 5,616,291 | 18.28 | $104,126,035 | 30-Sep-09 | | PRICE (T.ROWE) ASSOCIATES INC | 3,648,366 | 11.87 | $67,640,705 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | FIDELITY SMALL CAP INDEPENDENCE FUND | 1,610,453 | 5.24 | $27,039,505 | 31-Jul-09 | | PRICE (T.ROWE) NEW HORIZONS FUND | 1,579,300 | 5.14 | $29,280,222 | 30-Sep-09 | | Primecap Odyssey Growth Fund | 1,151,500 | 3.75 | $21,348,810 | 30-Sep-09 | | PRICE (T.ROWE) HEALTH SCIENCES FUND | 1,100,000 | 3.58 | $18,590,000 | 30-Jun-09 | | MFS Series Trust II-MFS Growth Fund | 1,007,790 | 3.28 | $15,973,471 | 31-May-09 | | Primecap Odyssey Aggressive Growth Fund | 770,950 | 2.51 | $14,293,413 | 30-Sep-09 | | FIDELITY SELECT PORTFOLIOS - MEDICAL EQUIPMENT & SYSTEMS | 700,000 | 2.28 | $12,978,000 | 30-Sep-09 | | FEDERATED KAUFMANN FUND | 3,634,700 | 11.83 | $61,026,613 | 31-Jul-09 | | LORD ABBETT DEVELOPING GROWTH FUND | 510,058 | 1.66 | $8,563,873 | 31-Jul-09 | | LKCM FUND-LKCM SMALL CAP EQUITY PORTFOLIO | 471,600 | 1.53 | $8,743,464 | 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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