| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | FMR LLC | 3,591,413 | 9.58 | $34,872,620 | 30-Sep-09 | | WADDELL & REED FINANCIAL INC. | 2,157,321 | 5.76 | $20,947,586 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 1,937,773 | 5.17 | $18,815,775 | 30-Sep-09 | | PRIMECAP MANAGEMENT COMPANY | 1,542,273 | 4.11 | $14,975,470 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 1,193,228 | 3.18 | $11,586,243 | 30-Sep-09 | | Capital Research Global Investors | 1,160,680 | 3.10 | $11,270,202 | 30-Sep-09 | | Portolan Capital Management, LLC | 1,148,873 | 3.06 | $11,155,556 | 30-Sep-09 | | JAY, JEFFREY R. | 967,800 | 2.58 | $9,397,338 | 30-Sep-09 | | PIONEER INVESTMENT MANAGEMENT INC. | 742,900 | 1.98 | $7,213,559 | 30-Sep-09 | | DIMENSIONAL FUND ADVISORS LP | 671,557 | 1.79 | $6,520,818 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | FIDELITY OTC PORTFOLIO | 1,000,600 | 2.67 | $9,715,826 | 30-Sep-09 | | FIDELITY SELECT PORTFOLIOS - MEDICAL EQUIPMENT & SYSTEMS | 800,000 | 2.13 | $7,768,000 | 30-Sep-09 | | Primecap Odyssey Aggressive Growth Fund | 794,673 | 2.12 | $7,716,274 | 30-Sep-09 | | SMALLCAP WORLD FUND | 754,200 | 2.01 | $6,652,044 | 30-Jun-09 | | FIDELITY SELECT PORTFOLIOS - HEALTH CARE | 592,418 | 1.58 | $5,752,378 | 30-Sep-09 | | Ivy Fds VIP-Small Cap Growth Port | 530,300 | 1.41 | $4,677,246 | 30-Jun-09 | | Primecap Odyssey Growth Fund | 500,000 | 1.33 | $4,855,000 | 30-Sep-09 | | ISHARES RUSSELL 2000 INDEX FD | 452,659 | 1.21 | $4,395,318 | 30-Sep-09 | | Pioneer Growth Opportunities Fund | 429,100 | 1.14 | $3,784,662 | 30-Jun-09 | | AMERICAN FDS INSURANCE SER-GLOBAL SMALL CAPITALIZATION F | 406,480 | 1.08 | $3,946,920 | 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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