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Filing Details

Accession Number:: 0001104659-10-042790
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2010-08-06 13:00:00
Reporting Period:: 2010-08-04

Filing Date:: 2010-08-06
Accepted Time:: 2010-08-06 17:03:18
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	Director	Officer	Large Shareholder	Other
1106910	Atlas Venture Fund V Lp	C/O Atlas Venture 890 Winter Street, Suite 320 Waltham MA 02451	No	No	Yes	No
1133805	Atlas Venture Associates V Lp	C/O Atlas Venture 890 Winter Street, Suite 320 Waltham MA 02451	No	No	Yes	No
1133807	Atlas Venture Entrepreneurs Fund V Lp	C/O Atlas Venture 890 Winter Street, Suite 320 Waltham MA 02451	No	No	Yes	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	Explanation
Common Stock	Disposition	2010-08-04	210,000	$17.94	13,685,380	No	4	S	Indirect	See Footnote
Common Stock	Disposition	2010-08-05	100,490	$18.02	13,584,890	No	4	S	Indirect	See Footnote
Common Stock	Disposition	2010-08-06	9,800	$18.12	13,575,090	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See Footnote
No	4	S	Indirect	See Footnote
No	4	S	Indirect	See Footnote

Footnotes

Sale of 207,237 shares of the Issuer's Common Stock by Atlas Venture Fund V, L.P. ("Atlas V") and of 2,763 shares of the Issuer's Common Stock held by Atlas Venture Entrepreneurs' Fund V, L.P. ("AVE V"). These shares are owned directly by Atlas V and AVE V. Atlas Venture Associates V, L.P. is the general partner of Atlas V and AVE V. Each of the Filing Persons disclaims beneficial ownership of such shares except to the extent of its pecuniary interest therein.
Represents a weighted-average price of shares disposed. These shares were sold in multiple transactions at prices ranging from $17.73 to $18.18, 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.
Represents aggregate shares beneficially owned after the reported transaction. Includes 13,505,309 shares held directly by Atlas V and 180,071 shares held directly by AVE V. These shares are owned directly by Atlas V and AVE V. Atlas Venture Associates V, L.P. is the general partner of Atlas V and AVE V. Each of the Filing Persons disclaims beneficial ownership of such shares except to the extent of its pecuniary interest therein.
Sale of 99,168 shares of the Issuer's Common Stock by Atlas V and of 1,322 shares of the Issuer's Common Stock held by AVE V. These shares are owned directly by Atlas V and AVE V. Atlas Venture Associates V, L.P. is the general partner of Atlas V and AVE V. Each of the Filing Persons disclaims beneficial ownership of such shares except to the extent of its pecuniary interest therein.
Represents a weighted-average price of shares disposed. These shares were sold in multiple transactions at prices ranging from $17.90 to $18.11, 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.
Represents aggregate shares beneficially owned after the reported transaction. Includes 13,406,141 shares held directly by Atlas V and 178,749 shares held directly by AVE V. These shares are owned directly by Atlas V and AVE V. Atlas Venture Associates V, L.P. is the general partner of Atlas V and AVE V. Each of the Filing Persons disclaims beneficial ownership of such shares except to the extent of its pecuniary interest therein.
Sale of 9,671 shares of the Issuer's Common Stock by Atlas V and of 129 shares of the Issuer's Common Stock held by AVE V. These shares are owned directly by Atlas V and AVE V. Atlas Venture Associates V, L.P. is the general partner of Atlas V and AVE V. Each of the Filing Persons disclaims beneficial ownership of such shares except to the extent of its pecuniary interest therein.
Represents a weighted-average price of shares disposed. These shares were sold in multiple transactions at prices ranging from $18.00 to $18.17, 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.
Represents aggregate shares beneficially owned after all of the reported transactions. Includes 13,396,470 shares held directly by Atlas V and 178,620 shares held directly by AVE V. These shares are owned directly by Atlas V and AVE V. Atlas Venture Associates V, L.P. is the general partner of Atlas V and AVE V. Each of the Filing Persons disclaims beneficial ownership of such shares except to the extent of its pecuniary interest therein.