| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | PRICE (T.ROWE) ASSOCIATES INC | 1,314,212 | 5.48 | $43,579,269 | 30-Sep-09 | | WADDELL & REED FINANCIAL INC. | 1,168,500 | 4.87 | $38,747,460 | 30-Sep-09 | | BABSON CAPITAL MANAGEMENT LLC | 838,742 | 3.50 | $27,812,684 | 30-Sep-09 | | LORD ABBETT & CO | 789,608 | 3.29 | $26,183,401 | 30-Sep-09 | | AVIVA PLC | 722,530 | 3.01 | $23,959,094 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 721,212 | 3.01 | $23,915,389 | 30-Sep-09 | | DRIEHAUS CAPITAL MANAGEMENT, INC. | 720,326 | 3.00 | $23,886,010 | 30-Sep-09 | | Barclays Global Investors UK Holdings Ltd | 644,589 | 2.69 | $21,374,571 | 30-Sep-09 | | Pictet Asset Management Ltd | 466,600 | 1.95 | $15,472,456 | 30-Sep-09 | | GRANAHAN INVESTMENT MANAGEMENT INC. | 435,270 | 1.82 | $14,433,553 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | PRICE (T.ROWE) NEW HORIZONS FUND | 971,900 | 4.05 | $32,228,204 | 30-Sep-09 | | WADDELL & REED ADVISORS FDS-SCIENCE & TECHNOLOGY FUND | 755,700 | 3.15 | $25,059,012 | 30-Sep-09 | | LORD ABBETT DEVELOPING GROWTH FUND | 656,713 | 2.74 | $20,147,954 | 31-Jul-09 | | VANGUARD EXPLORER FUND, INC. | 338,800 | 1.41 | $10,394,384 | 31-Jul-09 | | IVY SCIENCE & TECHNOLOGY FUND | 309,900 | 1.29 | $10,276,284 | 30-Sep-09 | | IVY REAL ESTATE SECURITIES FUND | 309,900 | 1.29 | $10,276,284 | 30-Sep-09 | | ISHARES RUSSELL 2000 INDEX FD | 187,522 | .78 | $5,387,507 | 31-Oct-09 | | VANGUARD TOTAL STOCK MARKET INDEX FUND | 183,271 | .76 | $3,971,482 | 30-Jun-09 | | VANGUARD SMALL-CAP INDEX FUND | 172,722 | .72 | $3,742,885 | 30-Jun-09 | | JOHN HANCOCK SMALL CAP EQUITY FUND | 155,757 | .65 | $4,474,898 | 31-Oct-09 |
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Value shown is computed using the security's price on the report date given.
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