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Saturday, December 5, 2009, 12:46PM ET - U.S. Markets Closed. Dow  0.22% Nasdaq  0.98%

Isilon Systems, Inc. (ISLN)

On Dec 4: 6.18   0.18 (3.00%)

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Major Holders Get Major Holders for:
BREAKDOWN % of Shares Held by All Insider and 5% Owners: 28% % of Shares Held by Institutional & Mutual Fund Owners: 37% % of Float Held by Institutional & Mutual Fund Owners: 52% Number of Institutions Holding Shares: 75 MAJOR DIRECT HOLDERS (FORMS 3 & 4) Holder Shares Reported ATLAS VENTURE FUND V LP N/A 14-Nov-08 FIDELMAN BARRY J N/A 14-Nov-08 MCILWAIN MATTHEW S 31,750 27-Feb-09 MADRONA VENTURE FUND I-A L P 8,714,176 27-Feb-09 PATEL SUJAL M 2,762,164 19-Nov-09
TOP INSTITUTIONAL HOLDERS Holder Shares % Out Value* Reported ARTIS CAPITAL MANAGEMENT, LLC 1,949,837 3.00 $11,894,005 30-Sep-09 SC X Management, LLC 11,651,603 17.96 $71,074,778 30-Sep-09 STEPHENS INVESTMENT MANAGEMENT LLC 1,125,909 1.74 $6,868,044 30-Sep-09 Barclays Global Investors UK Holdings Ltd 919,879 1.42 $5,611,261 30-Sep-09 RENAISSANCE TECHNOLOGIES, LLC 892,002 1.37 $5,441,212 30-Sep-09 VANGUARD GROUP, INC. (THE) 843,258 1.30 $5,143,873 30-Sep-09 WALL STREET ASSOCIATES 819,600 1.26 $4,999,560 30-Sep-09 Symmetry Peak Management LLC 727,940 1.12 $4,440,434 30-Sep-09 DIMENSIONAL FUND ADVISORS LP 562,005 .87 $3,428,230 30-Sep-09 FMR LLC 524,800 .81 $3,201,280 30-Sep-09 TOP MUTUAL FUND HOLDERS Holder Shares % Out Value* Reported ISHARES RUSSELL 2000 INDEX FD 381,853 .59 $2,329,303 30-Sep-09 FIDELITY SELECT PORTFOLIOS - TECHNOLOGY 290,400 .45 $1,771,440 30-Sep-09 VANGUARD SMALL-CAP INDEX FUND 273,348 .42 $1,158,995 30-Jun-09 RS Investment Trust-Technology Fund 234,160 .36 $1,428,376 30-Sep-09 ISHARES RUSSELL 2000 GROWTH INDEX FD 199,763 .31 $1,218,554 30-Sep-09 VANGUARD TOTAL STOCK MARKET INDEX FUND 198,228 .31 $840,486 30-Jun-09 VANGUARD SMALL-CAP GROWTH INDEX FUND 171,367 .26 $726,596 30-Jun-09 COLLEGE RETIREMENT EQUITIES FUND-STOCK ACCOUNT 125,319 .19 $531,352 30-Jun-09 EQ ADVISORS TRUST-EQ/SMALL COMPANY INDEX PORTFOLIO 112,900 .17 $478,696 30-Jun-09 DFA U.S. MICRO CAP SERIES 101,435 .16 $260,687 30-Apr-09 View Transactions for Insiders & Institutional Holders * Value shown is computed using the security's price on the report date given.
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