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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
Common Stock	Acquisiton	2010-10-12	2,640	$4.90	9,240	No	4	M	Direct
Common Stock	Acquisiton	2010-10-12	2,040	$2.57	11,280	No	4	M	Direct
Common Stock	Disposition	2010-10-12	4,680	$25.17	6,600	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
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	2010-10-12	2,640	$0.00	2,640	$4.90
Common Stock	Stock Option (Right to Buy)	Disposition	2010-10-12	2,040	$0.00	2,040	$2.57

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
174,440		2018-08-05	No	4	M	Direct
86,840		2019-05-15	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 option is exercisable at the rate of 25% of the shares on May 1, 2010 and 1/12th of the remaining shares on each quarterly anniversary thereafter, such that the option will be fully exercisable on May 1, 2013.
The sales reported by Ms. Godwin were effected pursuant to a Rule 10b5-1 trading plan adopted on May 26, 2010.