X0202 4 2007-08-27 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 2007-08-27 4 S false 12500 9.8949 D 2987664 D Common Stock 2007-08-28 4 S false 12500 9.794 D 2975164 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 $9.75 to $10.06 per share) in connection with the following dispositions: 100 shares at $9.75; 100 shares at $9.76; 300 shares at $9.77; 500 shares at $9.78; 500 shares at $9.79; 605 shares at $9.80; 393 shares at $9.81; 402 shares at $9.82; 100 shares at $9.83; 1,100 shares at $9.85; 700 shares at $9.86; 900 shares at $9.87; 300 shares at $9.88; 500 shares at $9.89; 363 shares at $9.90; 1,000 shares at $9.91; 537 shares at $9.92; 1,100 shares at $9.93; 100 shares at $9.94; 100 shares at $9.97; 216 shares at $9.98; 284 shares at $9.99; 700 shares at $10.00; 500 shares at $10.01; 400 shares at $10.02; 500 shares at $10.03; 100 shares at $10.04; 100 shares at $10.06. 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 $9.64 to $9.90 per share) in connection with the following dispositions: 100 shares at $9.64; 900 shares at $9.65; 2,030 shares at $9.70; 270 shares at $9.71; 700 shares at $9.74; 200 shares at $9.75; 600 shares at $9.76; 500 shares at $9.77; 200 shares at $9.78; 400 shares at $9.79; 200 shares at $9.80; 2,400 shares at $9.85; 1,500 shares at $9.86; 1,400 shares at $9.87; 700 shares at $9.88; 200 shares at $9.89; 200 shares at $9.90. Keenan Conder, Attorney-in-Fact 2007-08-29