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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	Director	Officer	Large Shareholder	Other
1103465	Madrona Venture Fund I-B, Lp	1000 Second Ave., Suite 3700 Seattle WA 98104	No	No	Yes	No
1103543	P L I-A Fund Venture Madrona	1000 Second Ave., Suite 3700 Seattle WA 98104	No	No	Yes	No
1107551	Madrona Managing Director Fund, Llc	1000 Second Ave. Suite 3700 Seattle WA 98104	No	No	Yes	No
1382421	Madrona Investment Partners, Llc	1000 Second Avenue Suite 3700 Seattle WA 98104	No	No	Yes	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	2010-04-26	100,000	$13.85	8,614,176	No	4	S	Direct
Common Stock	Disposition	2010-04-26	1,490,439	$0.00	7,123,737	No	4	J	Direct

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

Footnotes

Represents a weighted-average price. These shares were sold in multiple transactions at prices ranging from $13.46 to $14.02, inclusive. For all transactions reported in this Form 4 utilizing a weighted-average price, the reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.
Represents 6,945,543 shares held by Madrona Venture Fund I-A, LP, 755,940 shares held by Madrona Venture Fund I-B, LP and 912,693 shares held by Madrona Managing Director Fund, LLC. Madrona Investment Partners, LLC is the general partner of Madrona Venture Fund I-A, LP and Madrona Venture Fund I-B, LP and disclaims beneficial ownership of the shares except to the extent of its pecuniary interest therein.
Distribution of shares by Madrona Venture Fund I-A, LP, Madrona Venture Fund I-B, LP and Madrona Managing Director Fund, LLC to their respective limited partners and members.
Not applicable.
Represents 5,743,803 shares held by Madrona Venture Fund I-A, LP, 625,151 shares held by Madrona Venture Fund I-B, LP and 754,783 shares held by Madrona Managing Director Fund, LLC. Madrona Investment Partners, LLC is the general partner of Madrona Venture Fund I-A, LP and Madrona Venture Fund I-B, LP and disclaims beneficial ownership of the shares except to the extent of its pecuniary interest therein.