| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | Barclays Global Investors UK Holdings Ltd | 2,230,360 | 6.56 | $33,745,346 | 30-Sep-09 | | Capital Research Global Investors | 1,389,693 | 4.09 | $21,026,055 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 1,385,140 | 4.07 | $20,957,168 | 30-Sep-09 | | BROWN CAPITAL MANAGEMENT, INC. | 1,359,258 | 4.00 | $20,565,573 | 30-Sep-09 | | STATE STREET CORPORATION | 1,186,740 | 3.49 | $17,955,376 | 30-Sep-09 | | WADDELL & REED FINANCIAL INC. | 7,490,710 | 22.02 | $113,334,442 | 30-Sep-09 | | SMITH (THOMAS W.) | 863,723 | 2.54 | $13,068,128 | 30-Sep-09 | | WESTFIELD CAPITAL MANAGEMENT COMPANY | 772,657 | 2.27 | $11,690,300 | 30-Sep-09 | | ROYCE & ASSOCIATES, LLC | 706,481 | 2.08 | $10,689,057 | 30-Sep-09 | | RS Investment Management Co., LLC | 5,218,350 | 15.34 | $78,953,635 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | IVY SCIENCE & TECHNOLOGY FUND | 1,286,400 | 3.78 | $17,958,144 | 30-Jun-09 | | SMALLCAP WORLD FUND | 1,073,493 | 3.16 | $14,985,962 | 30-Jun-09 | | WADDELL & REED ADVISORS FDS-SMALL CAP FUND | 968,600 | 2.85 | $13,521,656 | 30-Jun-09 | | WADDELL & REED ADVISORS FDS-SCIENCE & TECHNOLOGY FUND | 3,773,400 | 11.09 | $52,676,664 | 30-Jun-09 | | RS INVESTMENT TRUST-PARTNERS FUND | 3,585,767 | 10.54 | $54,252,654 | 30-Sep-09 | | IVY SMALL CAP GROWTH FUND | 515,200 | 1.51 | $7,192,192 | 30-Jun-09 | | ISHARES RUSSELL 2000 INDEX FD | 514,668 | 1.51 | $7,786,926 | 30-Sep-09 | | Ivy Fds VIP-Science & Technology Port | 514,600 | 1.51 | $7,183,816 | 30-Jun-09 | | PENNSYLVANIA MUTUAL FUND INC | 435,731 | 1.28 | $6,082,804 | 30-Jun-09 | | VANGUARD SMALL-CAP INDEX FUND | 426,186 | 1.25 | $5,949,556 | 30-Jun-09 |
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Value shown is computed using the security's price on the report date given.
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