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Filing Details

Accession Number:: 0001246360-10-002894
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2010-08-04 13:00:00
Reporting Period:: 2010-08-02

Filing Date:: 2010-08-04
Accepted Time:: 2010-08-04 16:40:00
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
1186035	Brett Helsel	3101 Western Avenue Seattle WA 98121	Svp Engineering	No	No	No	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2010-08-02	37,500	$4.76	45,700	No	4	M	Direct
Common Stock	Acquisiton	2010-08-02	12,500	$2.57	58,200	No	4	M	Direct
Common Stock	Disposition	2010-08-02	25,000	$18.06	33,200	No	4	S	Direct
Common Stock	Disposition	2010-08-02	12,500	$18.06	20,700	No	4	S	Direct
Common Stock	Disposition	2010-08-02	12,500	$18.07	8,200	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
No	4	S	Direct
No	4	S	Direct

Reported Derivative Transactions

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Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Disposition	2010-08-02	37,500	$0.00	37,500	$4.76
Common Stock	Stock Option (Right to Buy)	Disposition	2010-08-02	12,500	$0.00	12,500	$2.57

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
252,500		2018-05-12	No	4	M	Direct
82,500		2019-05-15	No	4	M	Direct

Footnotes

The option is exercisable at the rate of 25% of the shares on March 11, 2009 and 1/12th of the remaining shares on each quarterly anniversary thereafter, such that the option will be fully exercisable on March 11, 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 Mr. Helsel were effected pursuant to a Rule 10b5-1 trading plan adopted on February 25, 2010.
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 $17.75 to $18.60, 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 footnote (4) to this Form 4.
The sales reported by Mr. Helsel were effected pursuant to a Rule 10b5-1 trading plan adopted on February 25, 2010.
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 $17.78 to $18.59, 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 footnote (6) to this Form 4.
The sales reported by Mr. Helsel were effected pursuant to a Rule 10b5-1 trading plan adopted on February 25, 2010.
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 $17.78 to $18.59, 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 footnote (8) to this Form 4.