X0202 4 2007-09-10 false 0001373671 Isilon Systems, Inc. ISLN 0001378830 Patel Sujal M C/O ISILON SYSTEMS, INC. 3101 WESTERN AVENUE SEATTLE WA 98121 true true false false Chief Technology Officer Common Stock 2007-09-10 4 S false 12500 9.6648 D 2962664 D Common Stock 2007-09-11 4 S false 12500 9.7335 D 2950164 D The sales reported were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 31, 2007. The "Amount" and "Price" disclosed in this Column 4 reflect the aggregate amount of securities and the average sales price (ranging from $9.52 to $10.05 per share) in connection with the following dispositions: 100 shares at $9.52; 700 shares at $9.53; 392 shares at $9.54; 908 shares at $9.55; 900 shares at $9.56; 900 shares at $9.57; 600 shares at $9.58; 300 shares at $9.59; 200 shares at $9.61; 600 shares at $9.62; 1,000 shares at $9.63; 700 shares at $9.64; 200 shares at $9.66; 500 shares at $9.67; 400 shares at $9.68; 200 shares at $9.69; 200 shares at $9.70; 100 shares at $9.72; 200 shares at $9.73; 200 shares at $9.74; 300 shares at $9.75; 500 shares at $9.76; 400 shares at $9.77; 161 shares at $9.78; 39 shares at $9.79; 400 shares at $9.80; 100 shares at $9.81; 200 shares at $9.83; 100 shares at $9.84; 100 shares at $9.88; 100 shares at $9.90; 300 shares at $9.92; 100 shares at $9.96; 300 shares at $10.01; 100 shares at $10.05. The sales reported were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 31, 2007. The "Amount" and "Price" disclosed in this Column 4 reflect the aggregate amount of securities and the average sales price (ranging from $9.60 to $9.93 per share) in connection with the following dispositions: 200 shares at $9.60; 800 shares at $9.61; 400 shares at $9.62; 500 shares at $9.63; 1,500 shares at $9.64; 1,400 shares at $9.65; 200 shares at $9.66; 100 shares at $9.67; 500 shares at $9.68; 300 shares at $9.69; 100 shares at $9.71; 200 shares at $9.75; 1,300 shares at $9.76; 300 shares at $9.77; 500 shares at $9.78; 100 shares at $9.80; 200 shares at $9.81; 600 shares at $9.82; 1,264 shares at $9.83; 336 shares at $9.84; 300 shares at $9.85; 500 shares at $9.86; 100 shares at $9.87; 400 shares at $9.88; 100 shares at $9.89; 100 shares at $9.90; 100 shares at $9.91; 100 shares at $9.93. Keenan Conder, Attorney-in-Fact 2007-09-12