| TOP INSTITUTIONAL HOLDERS |
| Holder | Shares | % Out | Value* | Reported | | Barclays Global Investors UK Holdings Ltd | 2,395,370 | 4.94 | $14,827,340 | 30-Sep-09 | | WELLS FARGO & COMPANY | 1,742,634 | 3.60 | $10,786,904 | 30-Sep-09 | | ESSEX INVESTMENT MANAGEMENT CO INC | 1,493,164 | 3.08 | $9,242,685 | 30-Sep-09 | | FEDERATED INVESTORS, INC. | 11,163,406 | 23.04 | $69,101,483 | 30-Sep-09 | | DIMENSIONAL FUND ADVISORS LP | 1,196,250 | 2.47 | $7,404,787 | 30-Sep-09 | | U.S. BANCORP (MINNESOTA) | 1,098,514 | 2.27 | $6,799,801 | 30-Sep-09 | | NEXT CENTURY GROWTH INVESTORS LLC | 1,057,121 | 2.18 | $6,543,578 | 30-Sep-09 | | OBERWEIS ASSET MANAGEMENT INC. | 1,017,800 | 2.10 | $6,300,182 | 30-Sep-09 | | ELLIOTT MANAGEMENT CORPORATION | 5,680,325 | 11.72 | $35,161,211 | 30-Sep-09 | | VANGUARD GROUP, INC. (THE) | 902,537 | 1.86 | $5,586,704 | 30-Sep-09 |
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| Holder | Shares | % Out | Value* | Reported | | FEDERATED KAUFMANN FUND | 3,555,556 | 7.34 | $17,173,335 | 31-Jul-09 | | ISHARES RUSSELL 2000 INDEX FD | 710,334 | 1.47 | $4,396,967 | 30-Sep-09 | | DFA U.S. SMALL CAP VALUE SERIES | 601,902 | 1.24 | $1,426,507 | 30-Apr-09 | | VANGUARD TOTAL STOCK MARKET INDEX FUND | 588,138 | 1.21 | $1,970,262 | 30-Jun-09 | | FIRST AMERICAN SMALL CAP SELECT FUND | 437,972 | .90 | $2,711,046 | 30-Sep-09 | | Managers AMG Funds-Essex Small/Micro Cap Growth Fund | 426,097 | .88 | $1,930,219 | 31-Aug-09 | | FEDERATED KAUFMANN SMALL CAP FUND | 378,563 | .78 | $1,828,459 | 31-Jul-09 | | ISHARES RUSSELL 2000 GROWTH INDEX FD | 373,416 | .77 | $2,311,445 | 30-Sep-09 | | Wells Fargo Advantage Discovery Fd | 304,150 | .63 | $1,882,688 | 30-Sep-09 | | COLLEGE RETIREMENT EQUITIES FUND-STOCK ACCOUNT | 229,555 | .47 | $769,009 | 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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