| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | Barclays Global Investors UK Holdings Ltd | 4,189,028 | 7.25 | $56,928,890 | 30-Sep-09 | | ALGER (FRED) MANAGEMENT INC | 3,221,621 | 5.58 | $43,781,829 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 2,520,266 | 4.36 | $34,250,414 | 30-Sep-09 | | SNYDER CAPITAL MANAGEMENT, LP | 1,842,149 | 3.19 | $25,034,804 | 30-Sep-09 | | Bank of New York Mellon Corporation | 1,561,588 | 2.70 | $21,221,980 | 30-Sep-09 | | STATE STREET CORPORATION | 1,351,832 | 2.34 | $18,371,396 | 30-Sep-09 | | GRANAHAN INVESTMENT MANAGEMENT INC. | 1,288,675 | 2.23 | $17,513,093 | 30-Sep-09 | | TURNER INVESTMENT PARTNERS, INC. | 1,287,406 | 2.23 | $17,495,847 | 30-Sep-09 | | LUTHER KING CAPITAL MANAGEMENT | 1,273,200 | 2.20 | $17,302,788 | 30-Sep-09 | | WELLINGTON MANAGEMENT COMPANY, LLP | 7,691,225 | 13.31 | $104,523,747 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | VANGUARD SPECIALIZED-HEALTH CARE FUND | 3,140,400 | 5.43 | $48,581,988 | 31-Jul-09 | | VANGUARD STRATEGIC EQUITY FUND | 952,700 | 1.65 | $13,699,826 | 30-Jun-09 | | VANGUARD EXPLORER FUND, INC. | 848,850 | 1.47 | $13,131,709 | 31-Jul-09 | | ISHARES RUSSELL 2000 INDEX FD | 845,526 | 1.46 | $11,490,698 | 30-Sep-09 | | ISHARES S&P SMALLCAP 600 INDEX FD | 751,417 | 1.30 | $9,407,740 | 31-Oct-09 | | VANGUARD SMALL-CAP INDEX FUND | 703,137 | 1.22 | $10,111,110 | 30-Jun-09 | | ALGER SMALL CAP GROWTH INSTITUTIONAL PORTFOLIO | 634,512 | 1.10 | $9,815,900 | 31-Jul-09 | | American Beacon Small Cap Value Fd | 565,480 | .98 | $7,684,873 | 30-Sep-09 | | VANGUARD TOTAL STOCK MARKET INDEX FUND | 539,827 | .93 | $7,762,712 | 30-Jun-09 | | TURNER EMERGING GROWTH FUND | 518,544 | .90 | $7,456,662 | 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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