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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1373671	Isilon Systems Inc.	ISLN	Computer Storage Devices (3572)	912101027

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1378830	M Sujal Patel	C/O Isilon Systems, Inc. 3101 Western Avenue Seattle WA 98121	President & Ceo	No	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2010-04-08	12,000	$9.75	2,583,164	No	4	S	Direct
Common Stock	Disposition	2010-04-09	12,000	$9.63	2,571,164	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	S	Direct

Footnotes

The sales reported were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 31, 2009.
The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average price, respectively, of shares disposed. These shares were sold in multiple transactions at prices ranging from $9.39 to $9.86, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) and (4) to this Form 4.
The sales reported were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 31, 2009.
The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average price, respectively, of shares disposed. These shares were sold in multiple transactions at prices ranging from $9.51 to $9.78, inclusive.