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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
1439716	E. Mary Godwin	3101 Western Avenue Seattle WA 98121	Vp Operations	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	Acquisiton	2010-04-26	40,000	$4.90	46,600	No	4	M	Direct
Common Stock	Disposition	2010-04-26	40,000	$13.79	6,600	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Disposition	2010-04-26	40,000	$0.00	40,000	$4.90

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
185,000		2018-08-05	No	4	M	Direct

Footnotes

The option is exercisable at the rate of 25% of the shares on July 9, 2009 and 1/12th of the remaining shares on each quarterly anniversary thereafter, such that the option will be fully exercisable on July 9, 2012.
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 $13.716 to $13.82, 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 herein.