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Filing Details

Accession Number:: 0001103543-10-000002
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2010-04-28 13:00:00
Reporting Period:: 2010-04-26

Filing Date:: 2010-04-28
Accepted Time:: 2010-04-28 19:41:24
SEC Url:: Form 4 Filing

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
1381752	S Matthew Mcilwain	1000 Second Avenue Suite 3700 Seattle WA 98104		Yes	No	Yes	No

Reported Non-Derivative Transactions

Show Other Fields >>

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	3,210	$0.00	34,960	No	4	J	Direct
Common Stock	Disposition	2010-04-26	100,000	$13.85	8,614,176	No	4	S	Indirect	See footnote
Common Stock	Disposition	2010-04-26	1,490,439	$0.00	7,123,737	No	4	J	Indirect	See footnote

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

Footnotes

Pro rata distribution of shares by Madrona Venture Fund I-B, LP and Madrona Managing Director Fund, LLC to their respective limited partners and members. The reporting person is a managing director and member of various entities affiliated with Madrona Venture Group, LLC.
Not applicable.
4,000 shares were acquired through reporting person's 401k plan.
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. The reporting person is a managing director and member of various entities affiliated with Madrona Venture Group, LLC. The reporting person does not have sole voting or dispositive authority over these shares and disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.
Pro rata 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. The reporting person is a managing director and member of various entities affiliated with Madrona Venture Group, LLC. The reporting person does not have sole voting or dispositive authority over these shares and disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.
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. The reporting person is a managing director and member of various entities affiliated with Madrona Venture Group, LLC. The reporting person does not have sole voting or dispositive authority over these shares and disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.