X0202 4 2007-08-16 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 2007-08-16 4 S false 12500 8.7816 D 3012664 D Common Stock 2007-08-17 4 S false 12500 9.1138 D 3000164 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 $8.56 to $9.23 per share) in connection with the following dispositions: 200 shares at $8.56; 100 shares at $8.57; 100 shares at $8.58; 100 shares at $8.59; 100 shares at $8.62; 200 shares at $8.64; 100 shares at $8.65; 100 shares at $8.66; 100 shares at $8.67; 200 shares at $8.69; 600 shares at $8.70; 300 shares at $8.71; 100 shares at $8.72; 200 shares at 8.73; 700 shares at $8.74; 1,000 shares at $8.75; 1,500 shares at $8.76; 1,100 shares at $8.77; 500 shares at $8.78; 300 shares at $8.79; 1,100 shares at $8.80; 500 shares at $8.81; 700 shares at $8.82; 100 shares at $8.83; 500 shares at $8.84; 500 shares at $8.85; 200 shares at $8.86; 300 shares at $8.87; 300 shares at $8.93; 300 shares at $8.94; 100 shares at $8.98; 100 shares at $9.07; 100 shares at $9.16; and 100 shares at $9.23. 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 $8.89 to $9.44 per share) in connection with the following dispositions: 100 shares at $8.89; 100 shares at $8.96; 200 shares at $8.97; 200 shares at $8.98; 200 shares at $8.99; 200 shares at $9.00; 200 shares at $9.01; 200 shares at $9.02; 1,000 shares at $9.05; 700 shares at $9.06; 1,200 shares at $9.07; 200 shares at $9.08; 1,500 shares at $9.09; 100 shares at $9.10; 700 shares at $9.11; 400 shares at $9.12; 700 shares at $9.13; 562 shares at $9.14; 1,638 shares at $9.15; 600 shares at $9.16; 700 shares at $9.17; 100 shares at $9.18; 100 shares at $9.20; 100 shares at $9.21; 100 shares at $9.28; 100 shares at $9.30; 100 shares at $9.35; 100 shares at $9.37; 200 shares at $9.39; 100 shares at $9.40; and 100 shares at 9.44. Keenan Conder, Attorney-in-Fact 2007-08-20