Isilon Systems Inc.

Seattle, Wash. • 206-315-7500 • www.isilon.com

Exchange and Ticker: Nasdaq: ISLN

Filing Range: 8.3M shares @ $8.5 to $9.5

Offering Price: $13.0

Close on First Day: $23.60

Offering Size: $108.6M

Shares Outstanding: 61.08M

Underwriters: Morgan Stanley/Merrill Lynch

Co-managers: Needham & Co. Inc./ RBC Capital Markets

Company Counsel: Wilson Sonsini Goodrich & Rosati

Manager Counsel : Fenwick & West LLP

Auditor: Pricewaterhouse Coopers LLP

Market Capitalization on 31/12/06: $1671.9M

Close price at current month end: $27.37

DESCRIPTION

Company, formerly known as Endurant Systems, makes distributed storage systems for delivery of media-rich content, such as video, audio, digital images, computer models, and test and simulation data. Competitors include EMC, Hewlett-Packard, Hitachi Data Systems, IBM, Network Appliance and Sun Microsystems.

VENTURE BACKERS

Atlas Venture, Eastman Kodak Co., Focus Ventures, Lehman Brothers, Madrona Group, Sequoia Capital.

Source: Thomson Financial