X0202 4 2007-09-25 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 2007-09-25 4 S false 12500 8.2779 D 2937664 D Common Stock 2007-09-26 4 S false 12500 8.1786 D 2925164 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 $8.18 to $8.39 per share) in connection with the following dispositions: 200 shares at $8.18; 100 shares at $8.19; 300 shares at $8.20; 1,400 shares at $8.21; 1,200 shares at $8.22; 1,100 shares at $8.23; 900 shares at $8.24; 500 shares at $8.25; 400 shares at $8.26; 400 shares at $8.27; 100 shares at $8.28; 800 shares at $8.29; 900 shares at $8.30; 400 shares at $8.31; 600 shares at $8.32; 500 shares at $8.33; 800 shares at $8.34; 200 shares at $8.35; 300 shares at $8.36; 500 shares at $8.37; 200 shares at $8.38; 700 shares at $8.39. 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 $8.00 to $8.37 per share) in connection with the following dispositions: 4 shares at $8.00; 500 shares at $8.01; 1,033 shares at $8.02; 1,100 shares at $8.03; 800 shares at $8.04; 100 shares at $8.05; 600 shares at $8.06; 563 shares at $8.08; 100 shares at $8.10; 100 shares at $8.14; 200 shares at $8.15; 200 shares at $8.17; 100 shares at $8.19; 200 shares at $8.20; 600 shares at $8.21; 500 shares at $8.22; 1,200 shares at $8.23; 100 shares at $8.25; 700 shares at $8.26; 400 shares at $8.27; 300 shares at $8.28; 700 shares at $8.29; 200 shares at $8.30; 100 shares at $8.31; 800 shares at $8.32; 600 shares at $8.33; 200 shares at $8.34; 100 shares at $8.35; 100 shares at $8.36; 300 shares at $8.37. Keenan Conder, Attorney-in-Fact 2007-09-26