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<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>As
filed with the Securities and Exchange Commission on January 18, 2007</B>
</DIV>


<DIV align="right" style="font-size: 10pt; margin-top: 6pt"><B>Registration No.&nbsp;333-</B>
</DIV>


<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 1pt solid black; font-size: 1pt">&nbsp;</DIV>




<DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><B>Washington, D.C. 20549</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><B><DIV align="center"><DIV style="font-size: 3pt; margin-top: 12pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></B>
</DIV>

<DIV align="center" style="font-size: 18pt; margin-top: 12pt"><B>FORM S-8</B>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 12pt"><B>REGISTRATION STATEMENT<BR>
<I>Under<BR>
The Securities Act of 1933</I></B>
</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 12pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>

</DIV>

<DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B>ISILON SYSTEMS, INC.</B>
</DIV>

<DIV align="center" style="font-size: 10pt"><B>(Exact name of Registrant as specified in its charter)</B></DIV>



<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 12pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>

</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="47%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><B>Delaware</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>91-2101027</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><B>(State or other jurisdiction of</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>(I.R.S. Employer</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><B>incorporation or organization)</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>Identification Number)</B></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>3101 Western Avenue<BR>
Seattle, Washington 98121<BR>
(206)&nbsp;315-7500<BR>
(Address, including zip code, and telephone number, including area code, of principal executive offices)</B>

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 12pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>AMENDED AND RESTATED 2001 STOCK PLAN<BR>
2006 EMPLOYEE STOCK PURCHASE PLAN<BR>
2006 EQUITY INCENTIVE PLAN<BR>
(Full title of the plan)</B>

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 12pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>Steven Goldman<BR>
President and Chief Executive Officer<BR>
Isilon Systems, Inc.<BR>
3101 Western Avenue<BR>
Seattle, Washington 98121<BR>
(206)&nbsp;315-7500<BR>
(Name, address, including zip code, and telephone number, including area code, of agent for service)</B>

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 12pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><I>Copies to:</I>

</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="47%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><B>Craig E. Sherman, Esq.</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>Douglas Choi, Esq.</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><B>Wilson Sonsini Goodrich &#038; Rosati,</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>General Counsel and Secretary</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><B>Professional Corporation</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>Isilon Systems, Inc.</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><B>701 Fifth Avenue, Suite&nbsp;5100</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>3101 Western Avenue</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><B>Seattle, Washington 98104</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>Seattle, Washington 98121</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><B>(206)&nbsp;883-2500</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>(206)&nbsp;315-7500</B></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>

</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>CALCULATION OF REGISTRATION FEE</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="1%">&nbsp;</TD>
    <TD width="37%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="9%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="10%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="7%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="7%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>

    <TD width="1%">&nbsp;</TD>
</TR><TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="23" style="border-bottom: 3px double #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Proposed</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Proposed</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Maximum</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Maximum</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Maximum</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center"><B>Title of Securities</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Amount</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Offering</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Aggregate</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Amount of</B></TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center"><B>to be</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>to be</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Price</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Offering</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Registration</B></TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center"><B>Registered</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Registered (1)(2)</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Per Share</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Price</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Fee</B></TD>
    <TD width="1%">&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
                    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Common Stock, $0.00001 par value</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD colspan="3" align="right" style="border-top: 2px solid #000000">6,497,951 shares (3)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD nowrap align="right" style="border-top: 2px solid #000000">$</TD>
    <TD align="right" style="border-top: 2px solid #000000">1.33 </TD>
    <TD nowrap style="border-top: 2px solid #000000">(4)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="right" style="border-top: 2px solid #000000">8,642,274.83</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="right" style="border-top: 2px solid #000000">$</TD>
    <TD align="right" style="border-top: 2px solid #000000">924.72</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Common Stock, $0.00001 par value</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD colspan="3" align="right" style="border-top: 2px solid #000000">254,162 shares (5)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD nowrap align="right" style="border-top: 2px solid #000000">$</TD>
    <TD align="right" style="border-top: 2px solid #000000">13.00 </TD>
    <TD nowrap style="border-top: 2px solid #000000">(4)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="right" style="border-top: 2px solid #000000">3,304,106.00</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="right" style="border-top: 2px solid #000000">$</TD>
    <TD align="right" style="border-top: 2px solid #000000">353.54</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Common Stock, $0.00001 par value</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD colspan="3" align="right" style="border-top: 2px solid #000000">9,286,741 shares (6)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD nowrap align="right" style="border-top: 2px solid #000000">$</TD>
    <TD align="right" style="border-top: 2px solid #000000">25.49 </TD>
    <TD nowrap style="border-top: 2px solid #000000">(8)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="right" style="border-top: 2px solid #000000">236,719,028.09</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="right" style="border-top: 2px solid #000000">$</TD>
    <TD align="right" style="border-top: 2px solid #000000">25,328.94</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Common Stock, $0.00001 par value</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD colspan="3" align="right" style="border-top: 2px solid #000000">750,000 shares (7)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD nowrap align="right" style="border-top: 2px solid #000000">$</TD>
    <TD align="right" style="border-top: 2px solid #000000">21.67 </TD>
    <TD nowrap style="border-top: 2px solid #000000">(9)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="right" style="border-top: 2px solid #000000">16,252,500.00</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="right" style="border-top: 2px solid #000000">1,739.02</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:30px; text-indent:-15px"><B>Total</B></DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD colspan="3" align="right" style="border-top: 2px solid #000000"><B>16,788,854 shares</B></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="right" style="border-top: 2px solid #000000"><B>264,917,908.92</B></TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="right" style="border-top: 2px solid #000000"><B>28,346.22</B></TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="23" style="border-top: 3px double #000000">&nbsp;</TD>
</TR>

<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 6pt; width: 18%; border-top: 0px solid #000000">&nbsp;</DIV>
</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">(1)</TD>
    <TD>&nbsp;</TD>
    <TD>Pursuant to Rule 416(a) of the Securities Act of 1933, this registration statement shall also cover any additional shares of the Registrant&#146;s Common Stock that become issuable under the Amended and Restated 2001
Stock Plan, the 2006 Employee Stock Purchase Plan or the 2006 Equity Incentive Plan by reason of any stock dividend, stock split, recapitalization or other similar transaction effected without receipt of consideration that
increases the number of the Registrant&#146;s outstanding shares of Common Stock.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(2)</TD>
    <TD>&nbsp;</TD>
    <TD>For the sole purpose of calculating the registration fee, the number of shares to be registered under this registration statement has been broken down into four subtotals.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(3)</TD>
    <TD>&nbsp;</TD>
    <TD>This subtotal represents the sum of shares issuable upon exercise of outstanding options granted under the Amended and Restated 2001 Stock Plan as of the date of this registration statement. No additional options will
be issued pursuant to the Amended and Restated 2001 Stock Plan.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(4)</TD>
    <TD>&nbsp;</TD>
    <TD>Offering prices of options that are outstanding as of the date of this registration statement are computed in accordance with Rule 457(h) based on the weighted average exercise price (rounded to the nearest cent) of the
outstanding options. Offering prices are estimated solely for the purpose of calculating the registration fee.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(5)</TD>
    <TD>&nbsp;</TD>
    <TD>This subtotal represents the registration of 254,162 shares issuable upon exercise of outstanding options granted under the 2006 Equity Incentive Plan as of the date of this registration statement.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(6)</TD>
    <TD>&nbsp;</TD>
    <TD>This subtotal represents the registration of an aggregate of 9,045,838 shares reserved for issuance under the 2006 Equity Incentive Plan and 240,903 shares authorized but not issued under the Amended and Restated 2001
Stock Plan, which became issuable under the 2006 Equity Incentive Plan pursuant to its terms.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(7)</TD>
    <TD>&nbsp;</TD>
    <TD>This subtotal represents the registration of the shares issuable under the 2006 Employee Stock Purchase Plan as of the date of this registration statement.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(8)</TD>
    <TD>&nbsp;</TD>
    <TD>Offering prices of awards that have not yet been granted as of the date of this registration statement are computed in accordance with Rule 457(c) and 457(h) of the Securities Act of 1933, as amended, solely for the
purpose of calculating the registration fee based upon the price of $25.49 per share, the average of the high and low prices of the Common Stock of the Registrant on January&nbsp;11, 2007 on the Nasdaq Global Market.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(9)</TD>
    <TD>&nbsp;</TD>
    <TD>The computation is based upon 85% of the average of the high and low price of the Common Stock as reported on the Nasdaq Global Market on January&nbsp;11, 2007, which is 85% of $25.49, or $21.6665 (rounded up to $21.66).
Pursuant to the 2006 Employee Stock Purchase Plan, the Purchase Price of a share of Common Stock shall be equal to 85% of the Fair Market Value of a share of Common Stock on the Exercise Date.</TD>
</TR>

</TABLE>



<DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>





<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<!-- TOC -->
<A name="toc"><DIV align="CENTER" style="page-break-before:always"><U><B>TABLE OF CONTENTS</B></U></DIV></A>

<P><CENTER>
<TABLE border="0" width="90%" cellpadding="0" cellspacing="0">
<TR>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="76%"></TD>
</TR>
<TR><TD colspan="9"><A HREF="#000">PART I</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#001">Item&nbsp;1. Plan Information</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#002">Item&nbsp;2. Registration Information and Employee Plan Annual Information</A></TD></TR>
<TR><TD colspan="9"><A HREF="#003">PART II</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#004">Item&nbsp;3. Incorporation of Documents by Reference</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#005">Item&nbsp;4. Description of Securities</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#006">Item&nbsp;5. Interests of Named Experts and Counsel</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#007">Item&nbsp;6. Indemnification of Directors and Officers</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#008">Item&nbsp;7. Exemption from Registration Claimed</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#009">Item&nbsp;8. Exhibits</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#010">Item&nbsp;9. Undertakings</A></TD></TR>
<TR><TD colspan="9"><A HREF="#011">SIGNATURES</A></TD></TR>
<TR><TD colspan="9"><A HREF="#012">INDEX TO EXHIBITS</A></TD></TR>
<TR><TD colspan="9"><A HREF="v26525exv5w1.txt">EXHIBIT 5.1</A></TD></TR>
<TR><TD colspan="9"><A HREF="v26525exv23w1.txt">EXHIBIT 23.1</A></TD></TR>
</TABLE>
</CENTER>
<!-- /TOC -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>







<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>ISILON SYSTEMS, INC.<BR>
REGISTRATION STATEMENT ON FORM S-8</B>
</DIV>

<!-- link1 "PART I" -->
<DIV align="left"><A NAME="000"></A></DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>PART I<BR>
INFORMATION REQUIRED IN THE PROSPECTUS</B>

</DIV>
<!-- link2 "Item&nbsp;1. Plan Information" -->
<DIV align="left"><A NAME="001"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;1. </B><U><B>Plan Information</B></U><B>.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The documents containing the information specified in this Item&nbsp;1 will be sent or given to
employees, officers, directors or others as specified by Rule&nbsp;428(b)(1) under the Securities Act of
1933, as amended (the &#147;Securities Act&#148;). In accordance with the rules and regulations of the
Securities and Exchange Commission (the &#147;Commission&#148;) and the instructions to Form S-8, such
documents are not being filed with the Commission either as part of this registration statement or
as prospectuses or prospectus supplements pursuant to Rule&nbsp;424.
</DIV>
<!-- link2 "Item&nbsp;2. Registration Information and Employee Plan Annual Information" -->
<DIV align="left"><A NAME="002"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;2. </B><U><B>Registration Information and Employee Plan Annual Information</B></U><B>.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The documents containing the information specified in this Item&nbsp;2 will be sent or given to
employees, officers, directors or others as specified by Rule&nbsp;428(b)(1) under the Securities Act.
In accordance with the rules and regulations of the Commission and the instructions to Form S-8,
such documents are not being filed with the Commission either as part of this registration
statement or as prospectuses or prospectus supplements pursuant to Rule&nbsp;424 under the Securities
Act.
</DIV>
<!-- link1 "PART II" -->
<DIV align="left"><A NAME="003"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART II</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>INFORMATION REQUIRED IN REGISTRATION STATEMENT</B>

</DIV>
<!-- link2 "Item&nbsp;3. Incorporation of Documents by Reference" -->
<DIV align="left"><A NAME="004"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;3. </B><U><B>Incorporation of Documents by Reference</B></U><B>.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;There are hereby incorporated by reference in this registration statement the following
documents and information heretofore filed by Isilon Systems, Inc. (the &#147;Registrant&#148;) with the
Securities and Exchange Commission:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) The Registrant&#146;s Prospectus pursuant to Rule 424(b) under the Securities Act filed
with the Commission on December&nbsp;14, 2006 relating to the registration statement on Form S-1
(File No.&nbsp;333-137078).
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) The description of the Registrant&#146;s Common Stock under the heading &#147;Description of
Capital Stock&#148; in the Prospectus forming a part of the Registrant&#146;s registration statement
on Form S-1 (File No.&nbsp;333-137078), as amended, which description has been incorporated by
reference in Item&nbsp;1 of the Registrant&#146;s registration statement on Form 8-A, as amended,
filed with the Commission on December&nbsp;7, 2006 (File No.&nbsp;001-33196), pursuant to Section&nbsp;12
of the Securities Exchange Act of 1934, as amended (the &#147;Exchange Act&#148;), including any
amendment or report filed for the purpose of updating such description.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All documents filed by Registrant pursuant to Sections&nbsp;13(a), 13(c), 14 and 15(d) of the
Exchange Act on or after the date of this registration statement and prior to the filing of a
post-effective amendment to this registration statement that indicates that all securities offered
have been sold or that deregisters all securities then remaining unsold shall be deemed to be
incorporated by reference in this registration statement and to be part hereof from the date of
filing of such documents.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Any statement contained in a document incorporated or deemed to be incorporated by reference
herein shall be deemed to be modified or superseded for purposes of this registration statement to
the extent that a statement contained herein or in any other subsequently filed document which also
is or is deemed to be incorporated by reference herein modifies or supersedes such statement. Any
statement so modified or superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this registration statement.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->II-1<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<!-- link2 "Item&nbsp;4. Description of Securities" -->
<DIV align="left"><A NAME="005"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;4. <U> Description of Securities</U>.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>
<!-- link2 "Item&nbsp;5. Interests of Named Experts and Counsel" -->
<DIV align="left"><A NAME="006"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;5. </B><U><B>Interests of Named Experts and Counsel</B></U><B>.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The validity of the shares of Common Stock offered hereby will be passed upon for us by Wilson
Sonsini Goodrich &#038; Rosati, Professional Corporation. Certain investment partnerships comprised of
members of, and persons associated with, Wilson Sonsini Goodrich &#038; Rosati beneficially hold an
aggregate of 46,188 shares of our Common Stock, which represents less than 0.01% of our
outstanding shares of Common Stock.
</DIV>
<!-- link2 "Item&nbsp;6. Indemnification of Directors and Officers" -->
<DIV align="left"><A NAME="007"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;6. </B><U><B>Indemnification of Directors and Officers</B></U><B>.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;145 of the Delaware General Corporation Law authorizes a court to award, or a
corporation&#146;s board of directors to grant, indemnity to officers, directors and other corporate
agents in terms sufficiently broad to permit such indemnification under certain circumstances and
subject to certain limitations.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As permitted by Section&nbsp;102(b)(7) of the Delaware General Corporation Law, the Registrant&#146;s
amended and restated certificate of incorporation includes provisions that eliminate the personal
liability of its directors and officers for monetary damages for breach of their fiduciary duty as
directors and officers.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In addition, as permitted by Section&nbsp;145 of the Delaware General Corporation Law, the amended
and restated bylaws of the Registrant provide that:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Registrant shall indemnify its directors and officers for serving the Registrant
in those capacities or for serving other business enterprises at the Registrant&#146;s
request, to the fullest extent permitted by Delaware law.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Registrant may, in its discretion, indemnify employees and agents in those
circumstances where indemnification is permitted by applicable law.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Registrant is required to advance expenses, as incurred, to its directors and
officers in connection with defending a proceeding, except that such director or
officer shall undertake to repay such advances if it is ultimately determined that such
person is not entitled to indemnification.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Registrant will not be obligated pursuant to the bylaws to indemnify a person
with respect to proceedings initiated by that person, except with respect to
proceedings authorized by the Registrant&#146;s board of directors or brought to enforce a
right to indemnification.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The rights conferred in the amended and restated bylaws are not exclusive, and the
Registrant is authorized to enter into indemnification agreements with its directors,
officers, employees and agents and to obtain insurance to indemnify such persons.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Registrant may not retroactively amend the bylaw provisions to reduce its
indemnification obligations to directors, officers, employees and agents.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant&#146;s policy is to enter into separate indemnification agreements with each of its
directors and officers that provide the maximum indemnity allowed to directors and executive
officers by Section&nbsp;145 of the Delaware General Corporation Law and also provide for certain
additional procedural protections. The Registrant also maintains directors&#146; and officers&#146;
insurance to insure such persons against certain liabilities.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;These indemnification provisions and the indemnification agreements entered into between the
Registrant and its officers and directors may be sufficiently broad to permit indemnification of
the Registrant&#146;s officers and directors for liabilities (including reimbursement of expenses
incurred) arising under the Securities Act.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->II-2<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<!-- link2 "Item&nbsp;7. Exemption from Registration Claimed" -->
<DIV align="left"><A NAME="008"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;7. </B><U><B>Exemption from Registration Claimed</B></U><B>.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>
<!-- link2 "Item&nbsp;8. Exhibits" -->
<DIV align="left"><A NAME="009"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;8. <U> Exhibits</U>.</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3"><B>Exhibit</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000"><B>Number</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Description</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.1</TD>
    <TD valign="top" nowrap>(1)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Amended and Restated Certificate of Incorporation.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.2</TD>
    <TD valign="top" nowrap>(2)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Amended and Restated Bylaws.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.1</TD>
    <TD valign="top" nowrap>(3)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Amended and Restated 2001 Stock Plan.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.2</TD>
    <TD valign="top" nowrap>(4)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Form of Stock Option Agreement under the Amended and Restated 2001 Stock Plan.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.3</TD>
    <TD valign="top" nowrap>(5)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">2006 Employee Stock Purchase Plan.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.4</TD>
    <TD valign="top" nowrap>(6)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Subscription Agreement under the 2006 Employee Stock Purchase Plan.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.5</TD>
    <TD valign="top" nowrap>(7)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">2006 Equity Incentive Plan.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.6</TD>
    <TD valign="top" nowrap>(8)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Form of Stock Option Agreement under the 2006 Equity Incentive Plan.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">5.1</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Opinion of Wilson Sonsini Goodrich &#038; Rosati, Professional Corporation.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">23.1</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Consent of PricewaterhouseCoopers LLP, Independent Registered Public Accounting Firm.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">23.2</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Consent of Wilson Sonsini Goodrich &#038; Rosati, Professional Corporation (see Exhibit&nbsp;5.1).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">24.1</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Power of Attorney (see page II-5).</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">(1)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;3.1 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on September&nbsp;1, 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(2)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;3.2 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on September&nbsp;1, 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(3)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;10.2 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on September&nbsp;1, 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(4)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;10.3 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on September&nbsp;1, 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(5)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;10.6 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on November&nbsp;24, 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(6)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;10.7 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on November&nbsp;24, 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(7)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;10.5 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on November&nbsp;24, 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(8)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;10.4 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on November&nbsp;24, 2006.</TD>
</TR>

</TABLE>


<!-- link2 "Item&nbsp;9. Undertakings" -->
<DIV align="left"><A NAME="010"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;9. </B><U><B>Undertakings</B></U><B>.</B>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">A.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The undersigned Registrant hereby undertakes:</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;To file, during any period in which offers or sales are being made, a post-effective
amendment to this registration statement:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;To include any prospectus required by section 10(a)(3) of the Securities Act of 1933;
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;To reflect in the prospectus any facts or events arising after the effective date of the
registration statement (or the most recent post-effective amendment thereof) which, individually or
in the aggregate, represent a fundamental change in the information set forth in the registration
statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered
(if the total dollar value of securities offered would not exceed that which was registered) and
any deviation from the low or high end of the estimated maximum offering range may be reflected in
the form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the
changes in volume and price represent no more than a 20&nbsp;percent change in the maximum aggregate
offering price set forth in the &#147;Calculation of Registration Fee&#148; table in the effective
registration statement;
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->II-3<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;To include any material information with respect to the plan of distribution not
previously disclosed in the registration statement or any material change to such information in
this registration statement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Provided, however</I>, that paragraphs (i)&nbsp;and (ii)&nbsp;of this section do not apply if the
information required to be included in a post-effective amendment by those paragraphs is contained
in periodic reports filed with or furnished to the Commission by the Registrant pursuant to section
13 or section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in
the registration statement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;That, for the purpose of determining any liability under the Securities Act of 1933, each
such post-effective amendment shall be deemed to be a new registration statement relating to the
securities offered therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)&nbsp;To remove from registration by means of a post-effective amendment any of the securities
being registered which remain unsold at the termination of the offering.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4)&nbsp;That, for the purpose of determining liability of the Registrant under the Securities Act
of 1933 to any purchaser in the initial distribution of the securities, the undersigned Registrant
undertakes that in a primary offering of securities of the undersigned Registrant pursuant to this
registration statement, regardless of the underwriting method used to sell the securities to the
purchaser, if the securities are offered or sold to such purchaser by means of any of the following
communications, the undersigned Registrant will be a seller to the purchaser and will be considered
to offer or sell such securities to such purchaser:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;Any preliminary prospectus or prospectus of the undersigned Registrant relating to the
offering required to be filed pursuant to Rule&nbsp;424;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;Any free writing prospectus relating to the offering prepared by or on behalf of the
undersigned Registrant or used or referred to by the undersigned Registrant;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;The portion of any other free writing prospectus relating to the offering containing
material information about the undersigned Registrant or its securities provided by or on behalf of
the undersigned Registrant; and
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv)&nbsp;Any other communication that is an offer in the offering made by the undersigned
Registrant to the purchaser.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.&nbsp;The undersigned Registrant hereby undertakes that, for purposes of determining any
liability under the Securities Act of 1933, each filing of the Registrant&#146;s annual report pursuant
to section 13(a) or section 15(d) of the Securities Exchange Act of 1934 (and, where applicable,
each filing of an employee benefit plan&#146;s annual report pursuant to section 15(d) of the Securities
Exchange Act of 1934) that is incorporated by reference in the registration statement shall be
deemed to be a new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona fide offering
thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.&nbsp;Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be
permitted to directors, officers and controlling persons of the Registrant pursuant to the
foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy as expressed in
the Act and is, therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the Registrant of expenses incurred or paid by a
director, officer or controlling person of the Registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person in connection with
the securities being registered, the Registrant will, unless in the opinion of its counsel the
matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the
question whether such indemnification by it is against public policy as expressed in the Securities
Act of 1933 and will be governed by the final adjudication of such issue.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->II-4<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<!-- link1 "SIGNATURES" -->
<DIV align="left"><A NAME="011"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SIGNATURES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, Isilon Systems, Inc., a
corporation organized and existing under the laws of the State of Delaware, certifies that it has
reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has
duly caused this registration statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Seattle, State of Washington, on this 16th day of January, 2007.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="50%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">ISILON SYSTEMS, INC.</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">By:
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Steven Goldman</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top"><DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Steven Goldman
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top"><I>President, Chief Executive Officer and Director</I></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>POWER OF ATTORNEY</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes
and appoints Steven Goldman and Stuart W. Fuhlendorf, and each of them, as his attorneys-in-fact,
with full power of substitution in each, for him in any and all capacities to sign any and all
amendments to this registration statement on Form S-8, and to file the same, with all exhibits
thereto and other documents in connection therewith, with the Securities and Exchange Commission,
hereby ratifying and confirming all that each of said attorneys-in-fact, or his substitutes, may do
or cause to be done by virtue hereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, this registration statement has
been signed below by the following persons in the capacities and on the dates indicated.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="35%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Signature</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Title</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Date</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="center" nowrap valign="top">/s/ Steven Goldman
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Steven Goldman</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
President, Chief Executive Officer
and Director (Principal Executive
Officer)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January 16, 2007</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="center" nowrap valign="top">/s/ Stuart W. Fuhlendorf
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Stuart W. Fuhlendorf</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
Chief Financial Officer and Vice
President of Finance (Principal
Accounting and Financial Officer)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January 16, 2007</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="center" nowrap valign="top">/s/  Sujal M. Patel
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Sujal M. Patel</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
Chief Technology Officer and Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January 16, 2007</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="center" nowrap valign="top">/s/ Elliott H. Jurgensen, Jr.
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Elliott H. Jurgensen, Jr.</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January 16, 2007</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="center" nowrap valign="top">/s/ William D. Ruckelshaus
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
William D. Ruckelshaus</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
Chairman of the Board and Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January 16, 2007</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="center" nowrap valign="top">/s/ Gregory L. McAdoo
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Gregory L. McAdoo</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January 16, 2007</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="center" nowrap valign="top">/s/ Barry J. Fidelman
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Barry J. Fidelman</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January 16, 2007</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="center" nowrap valign="top">/s/ Matthew S. McIlwain
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
Matthew S. McIlwain</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January 16, 2007</TD>
</TR>
<TR valign="bottom" style="padding-top: 1em">
    <TD align="center" nowrap valign="top">/s/ James G. Richardson
<DIV style="font-size: 1pt; border-bottom: 1px solid #000000">&nbsp;</DIV>
James G. Richardson</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">
Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January 16, 2007</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->II-5<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<!-- link1 "INDEX TO EXHIBITS" -->
<DIV align="left"><A NAME="012"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>INDEX TO EXHIBITS</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3"><B>Exhibit</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000"><B>Number</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Description</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.1</TD>
    <TD valign="top" nowrap>(1)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Amended and Restated Certificate of Incorporation.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.2</TD>
    <TD valign="top" nowrap>(2)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Amended and Restated Bylaws.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.1</TD>
    <TD valign="top" nowrap>(3)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Amended and Restated 2001 Stock Plan.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.2</TD>
    <TD valign="top" nowrap>(4)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Form of Stock Option Agreement under the Amended and Restated 2001 Stock Plan.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.3</TD>
    <TD valign="top" nowrap>(5)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">2006 Employee Stock Purchase Plan.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.4</TD>
    <TD valign="top" nowrap>(6)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Subscription Agreement under the 2006 Employee Stock Purchase Plan.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.5</TD>
    <TD valign="top" nowrap>(7)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">2006 Equity Incentive Plan.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">4.6</TD>
    <TD valign="top" nowrap>(8)</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Form of Stock Option Agreement under the 2006 Equity Incentive Plan.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">5.1</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Opinion of Wilson Sonsini Goodrich &#038; Rosati, Professional Corporation.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">23.1</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Consent of PricewaterhouseCoopers LLP, Independent Registered Public Accounting Firm.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">23.2</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Consent of Wilson Sonsini Goodrich &#038; Rosati, Professional Corporation (see Exhibit&nbsp;5.1).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top" align="right">24.1</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">Power of Attorney (see page II-5).</DIV></TD>
</TR>
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    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">(1)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;3.1 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on September&nbsp;1, 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(2)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;3.2 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on September&nbsp;1, 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(3)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;10.2 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on September&nbsp;1, 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(4)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;10.3 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on September&nbsp;1, 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(5)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;10.6 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on November&nbsp;24, 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(6)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;10.7 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on November&nbsp;24, 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(7)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;10.5 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on November&nbsp;24, 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(8)</TD>
    <TD>&nbsp;</TD>
    <TD>Incorporated by reference from Exhibit&nbsp;10.4 to the Registrant&#146;s registration
statement (No.&nbsp;333-137078) on Form S-1, as amended, filed on November&nbsp;24, 2006.</TD>
</TR>

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sv8
Table of Contents
As
filed with the Securities and Exchange Commission on January 18, 2007
Registration No. 333-
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM S-8
REGISTRATION STATEMENT
Under
The Securities Act of 1933
ISILON SYSTEMS, INC.
(Exact name of Registrant as specified in its charter)
Delaware
91-2101027
(State or other jurisdiction of
(I.R.S. Employer
incorporation or organization)
Identification Number)
3101 Western Avenue
Seattle, Washington 98121
(206) 315-7500
(Address, including zip code, and telephone number, including area code, of principal executive offices)
AMENDED AND RESTATED 2001 STOCK PLAN
2006 EMPLOYEE STOCK PURCHASE PLAN
2006 EQUITY INCENTIVE PLAN
(Full title of the plan)
Steven Goldman
President and Chief Executive Officer
Isilon Systems, Inc.
3101 Western Avenue
Seattle, Washington 98121
(206) 315-7500
(Name, address, including zip code, and telephone number, including area code, of agent for service)
Copies to:
Craig E. Sherman, Esq.
Douglas Choi, Esq.
Wilson Sonsini Goodrich & Rosati,
General Counsel and Secretary
Professional Corporation
Isilon Systems, Inc.
701 Fifth Avenue, Suite 5100
3101 Western Avenue
Seattle, Washington 98104
Seattle, Washington 98121
(206) 883-2500
(206) 315-7500
CALCULATION OF REGISTRATION FEE
Proposed
Proposed
Maximum
Maximum
Maximum
Title of Securities
Amount
Offering
Aggregate
Amount of
to be
to be
Price
Offering
Registration
Registered
Registered (1)(2)
Per Share
Price
Fee
Common Stock, $0.00001 par value
6,497,951 shares (3)
$
1.33
(4)
8,642,274.83
$
924.72
Common Stock, $0.00001 par value
254,162 shares (5)
$
13.00
(4)
3,304,106.00
$
353.54
Common Stock, $0.00001 par value
9,286,741 shares (6)
$
25.49
(8)
236,719,028.09
$
25,328.94
Common Stock, $0.00001 par value
750,000 shares (7)
$
21.67
(9)
16,252,500.00
1,739.02
Total
16,788,854 shares
264,917,908.92
28,346.22
(1)
Pursuant to Rule 416(a) of the Securities Act of 1933, this registration statement shall also cover any additional shares of the Registrant's Common Stock that become issuable under the Amended and Restated 2001
Stock Plan, the 2006 Employee Stock Purchase Plan or the 2006 Equity Incentive Plan by reason of any stock dividend, stock split, recapitalization or other similar transaction effected without receipt of consideration that
increases the number of the Registrant's outstanding shares of Common Stock.
(2)
For the sole purpose of calculating the registration fee, the number of shares to be registered under this registration statement has been broken down into four subtotals.
(3)
This subtotal represents the sum of shares issuable upon exercise of outstanding options granted under the Amended and Restated 2001 Stock Plan as of the date of this registration statement. No additional options will
be issued pursuant to the Amended and Restated 2001 Stock Plan.
(4)
Offering prices of options that are outstanding as of the date of this registration statement are computed in accordance with Rule 457(h) based on the weighted average exercise price (rounded to the nearest cent) of the
outstanding options. Offering prices are estimated solely for the purpose of calculating the registration fee.
(5)
This subtotal represents the registration of 254,162 shares issuable upon exercise of outstanding options granted under the 2006 Equity Incentive Plan as of the date of this registration statement.
(6)
This subtotal represents the registration of an aggregate of 9,045,838 shares reserved for issuance under the 2006 Equity Incentive Plan and 240,903 shares authorized but not issued under the Amended and Restated 2001
Stock Plan, which became issuable under the 2006 Equity Incentive Plan pursuant to its terms.
(7)
This subtotal represents the registration of the shares issuable under the 2006 Employee Stock Purchase Plan as of the date of this registration statement.
(8)
Offering prices of awards that have not yet been granted as of the date of this registration statement are computed in accordance with Rule 457(c) and 457(h) of the Securities Act of 1933, as amended, solely for the
purpose of calculating the registration fee based upon the price of $25.49 per share, the average of the high and low prices of the Common Stock of the Registrant on January 11, 2007 on the Nasdaq Global Market.
(9)
The computation is based upon 85% of the average of the high and low price of the Common Stock as reported on the Nasdaq Global Market on January 11, 2007, which is 85% of $25.49, or $21.6665 (rounded up to $21.66).
Pursuant to the 2006 Employee Stock Purchase Plan, the Purchase Price of a share of Common Stock shall be equal to 85% of the Fair Market Value of a share of Common Stock on the Exercise Date.
TABLE OF CONTENTS
PART I
Item 1. Plan Information
Item 2. Registration Information and Employee Plan Annual Information
PART II
Item 3. Incorporation of Documents by Reference
Item 4. Description of Securities
Item 5. Interests of Named Experts and Counsel
Item 6. Indemnification of Directors and Officers
Item 7. Exemption from Registration Claimed
Item 8. Exhibits
Item 9. Undertakings
SIGNATURES
INDEX TO EXHIBITS
EXHIBIT 5.1
EXHIBIT 23.1
Table of Contents
ISILON SYSTEMS, INC.
REGISTRATION STATEMENT ON FORM S-8
PART I
INFORMATION REQUIRED IN THE PROSPECTUS
Item 1.
Plan Information
.
The documents containing the information specified in this Item 1 will be sent or given to
employees, officers, directors or others as specified by Rule 428(b)(1) under the Securities Act of
1933, as amended (the "Securities Act"). In accordance with the rules and regulations of the
Securities and Exchange Commission (the "Commission") and the instructions to Form S-8, such
documents are not being filed with the Commission either as part of this registration statement or
as prospectuses or prospectus supplements pursuant to Rule 424.
Item 2.
Registration Information and Employee Plan Annual Information
.
The documents containing the information specified in this Item 2 will be sent or given to
employees, officers, directors or others as specified by Rule 428(b)(1) under the Securities Act.
In accordance with the rules and regulations of the Commission and the instructions to Form S-8,
such documents are not being filed with the Commission either as part of this registration
statement or as prospectuses or prospectus supplements pursuant to Rule 424 under the Securities
Act.
PART II
INFORMATION REQUIRED IN REGISTRATION STATEMENT
Item 3.
Incorporation of Documents by Reference
.
There are hereby incorporated by reference in this registration statement the following
documents and information heretofore filed by Isilon Systems, Inc. (the "Registrant") with the
Securities and Exchange Commission:
(1) The Registrant's Prospectus pursuant to Rule 424(b) under the Securities Act filed
with the Commission on December 14, 2006 relating to the registration statement on Form S-1
(File No. 333-137078).
(2) The description of the Registrant's Common Stock under the heading "Description of
Capital Stock" in the Prospectus forming a part of the Registrant's registration statement
on Form S-1 (File No. 333-137078), as amended, which description has been incorporated by
reference in Item 1 of the Registrant's registration statement on Form 8-A, as amended,
filed with the Commission on December 7, 2006 (File No. 001-33196), pursuant to Section 12
of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), including any
amendment or report filed for the purpose of updating such description.
All documents filed by Registrant pursuant to Sections 13(a), 13(c), 14 and 15(d) of the
Exchange Act on or after the date of this registration statement and prior to the filing of a
post-effective amendment to this registration statement that indicates that all securities offered
have been sold or that deregisters all securities then remaining unsold shall be deemed to be
incorporated by reference in this registration statement and to be part hereof from the date of
filing of such documents.
Any statement contained in a document incorporated or deemed to be incorporated by reference
herein shall be deemed to be modified or superseded for purposes of this registration statement to
the extent that a statement contained herein or in any other subsequently filed document which also
is or is deemed to be incorporated by reference herein modifies or supersedes such statement. Any
statement so modified or superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this registration statement.
II-1
Table of Contents
Item 4.
Description of Securities
.
Not applicable.
Item 5.
Interests of Named Experts and Counsel
.
The validity of the shares of Common Stock offered hereby will be passed upon for us by Wilson
Sonsini Goodrich & Rosati, Professional Corporation. Certain investment partnerships comprised of
members of, and persons associated with, Wilson Sonsini Goodrich & Rosati beneficially hold an
aggregate of 46,188 shares of our Common Stock, which represents less than 0.01% of our
outstanding shares of Common Stock.
Item 6.
Indemnification of Directors and Officers
.
Section 145 of the Delaware General Corporation Law authorizes a court to award, or a
corporation's board of directors to grant, indemnity to officers, directors and other corporate
agents in terms sufficiently broad to permit such indemnification under certain circumstances and
subject to certain limitations.
As permitted by Section 102(b)(7) of the Delaware General Corporation Law, the Registrant's
amended and restated certificate of incorporation includes provisions that eliminate the personal
liability of its directors and officers for monetary damages for breach of their fiduciary duty as
directors and officers.
In addition, as permitted by Section 145 of the Delaware General Corporation Law, the amended
and restated bylaws of the Registrant provide that:
•
The Registrant shall indemnify its directors and officers for serving the Registrant
in those capacities or for serving other business enterprises at the Registrant's
request, to the fullest extent permitted by Delaware law.
•
The Registrant may, in its discretion, indemnify employees and agents in those
circumstances where indemnification is permitted by applicable law.
•
The Registrant is required to advance expenses, as incurred, to its directors and
officers in connection with defending a proceeding, except that such director or
officer shall undertake to repay such advances if it is ultimately determined that such
person is not entitled to indemnification.
•
The Registrant will not be obligated pursuant to the bylaws to indemnify a person
with respect to proceedings initiated by that person, except with respect to
proceedings authorized by the Registrant's board of directors or brought to enforce a
right to indemnification.
•
The rights conferred in the amended and restated bylaws are not exclusive, and the
Registrant is authorized to enter into indemnification agreements with its directors,
officers, employees and agents and to obtain insurance to indemnify such persons.
•
The Registrant may not retroactively amend the bylaw provisions to reduce its
indemnification obligations to directors, officers, employees and agents.
The Registrant's policy is to enter into separate indemnification agreements with each of its
directors and officers that provide the maximum indemnity allowed to directors and executive
officers by Section 145 of the Delaware General Corporation Law and also provide for certain
additional procedural protections. The Registrant also maintains directors' and officers'
insurance to insure such persons against certain liabilities.
These indemnification provisions and the indemnification agreements entered into between the
Registrant and its officers and directors may be sufficiently broad to permit indemnification of
the Registrant's officers and directors for liabilities (including reimbursement of expenses
incurred) arising under the Securities Act.
II-2
Table of Contents
Item 7.
Exemption from Registration Claimed
.
Not applicable.
Item 8.
Exhibits
.
Exhibit
Number
Description
4.1
(1)
Amended and Restated Certificate of Incorporation.
4.2
(2)
Amended and Restated Bylaws.
4.1
(3)
Amended and Restated 2001 Stock Plan.
4.2
(4)
Form of Stock Option Agreement under the Amended and Restated 2001 Stock Plan.
4.3
(5)
2006 Employee Stock Purchase Plan.
4.4
(6)
Subscription Agreement under the 2006 Employee Stock Purchase Plan.
4.5
(7)
2006 Equity Incentive Plan.
4.6
(8)
Form of Stock Option Agreement under the 2006 Equity Incentive Plan.
5.1
Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation.
23.1
Consent of PricewaterhouseCoopers LLP, Independent Registered Public Accounting Firm.
23.2
Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation (see Exhibit 5.1).
24.1
Power of Attorney (see page II-5).
(1)
Incorporated by reference from Exhibit 3.1 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on September 1, 2006.
(2)
Incorporated by reference from Exhibit 3.2 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on September 1, 2006.
(3)
Incorporated by reference from Exhibit 10.2 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on September 1, 2006.
(4)
Incorporated by reference from Exhibit 10.3 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on September 1, 2006.
(5)
Incorporated by reference from Exhibit 10.6 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on November 24, 2006.
(6)
Incorporated by reference from Exhibit 10.7 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on November 24, 2006.
(7)
Incorporated by reference from Exhibit 10.5 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on November 24, 2006.
(8)
Incorporated by reference from Exhibit 10.4 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on November 24, 2006.
Item 9.
Undertakings
.
A.
The undersigned Registrant hereby undertakes:
(1) To file, during any period in which offers or sales are being made, a post-effective
amendment to this registration statement:
(i) To include any prospectus required by section 10(a)(3) of the Securities Act of 1933;
(ii) To reflect in the prospectus any facts or events arising after the effective date of the
registration statement (or the most recent post-effective amendment thereof) which, individually or
in the aggregate, represent a fundamental change in the information set forth in the registration
statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered
(if the total dollar value of securities offered would not exceed that which was registered) and
any deviation from the low or high end of the estimated maximum offering range may be reflected in
the form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the
changes in volume and price represent no more than a 20 percent change in the maximum aggregate
offering price set forth in the "Calculation of Registration Fee" table in the effective
registration statement;
II-3
Table of Contents
(iii) To include any material information with respect to the plan of distribution not
previously disclosed in the registration statement or any material change to such information in
this registration statement.
Provided, however
, that paragraphs (i) and (ii) of this section do not apply if the
information required to be included in a post-effective amendment by those paragraphs is contained
in periodic reports filed with or furnished to the Commission by the Registrant pursuant to section
13 or section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in
the registration statement.
(2) That, for the purpose of determining any liability under the Securities Act of 1933, each
such post-effective amendment shall be deemed to be a new registration statement relating to the
securities offered therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
(3) To remove from registration by means of a post-effective amendment any of the securities
being registered which remain unsold at the termination of the offering.
(4) That, for the purpose of determining liability of the Registrant under the Securities Act
of 1933 to any purchaser in the initial distribution of the securities, the undersigned Registrant
undertakes that in a primary offering of securities of the undersigned Registrant pursuant to this
registration statement, regardless of the underwriting method used to sell the securities to the
purchaser, if the securities are offered or sold to such purchaser by means of any of the following
communications, the undersigned Registrant will be a seller to the purchaser and will be considered
to offer or sell such securities to such purchaser:
(i) Any preliminary prospectus or prospectus of the undersigned Registrant relating to the
offering required to be filed pursuant to Rule 424;
(ii) Any free writing prospectus relating to the offering prepared by or on behalf of the
undersigned Registrant or used or referred to by the undersigned Registrant;
(iii) The portion of any other free writing prospectus relating to the offering containing
material information about the undersigned Registrant or its securities provided by or on behalf of
the undersigned Registrant; and
(iv) Any other communication that is an offer in the offering made by the undersigned
Registrant to the purchaser.
B. The undersigned Registrant hereby undertakes that, for purposes of determining any
liability under the Securities Act of 1933, each filing of the Registrant's annual report pursuant
to section 13(a) or section 15(d) of the Securities Exchange Act of 1934 (and, where applicable,
each filing of an employee benefit plan's annual report pursuant to section 15(d) of the Securities
Exchange Act of 1934) that is incorporated by reference in the registration statement shall be
deemed to be a new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona fide offering
thereof.
C. Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be
permitted to directors, officers and controlling persons of the Registrant pursuant to the
foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy as expressed in
the Act and is, therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the Registrant of expenses incurred or paid by a
director, officer or controlling person of the Registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person in connection with
the securities being registered, the Registrant will, unless in the opinion of its counsel the
matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the
question whether such indemnification by it is against public policy as expressed in the Securities
Act of 1933 and will be governed by the final adjudication of such issue.
II-4
Table of Contents
SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, Isilon Systems, Inc., a
corporation organized and existing under the laws of the State of Delaware, certifies that it has
reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has
duly caused this registration statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Seattle, State of Washington, on this 16th day of January, 2007.
ISILON SYSTEMS, INC.
By:
/s/ Steven Goldman
Steven Goldman
President, Chief Executive Officer and Director
POWER OF ATTORNEY
KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes
and appoints Steven Goldman and Stuart W. Fuhlendorf, and each of them, as his attorneys-in-fact,
with full power of substitution in each, for him in any and all capacities to sign any and all
amendments to this registration statement on Form S-8, and to file the same, with all exhibits
thereto and other documents in connection therewith, with the Securities and Exchange Commission,
hereby ratifying and confirming all that each of said attorneys-in-fact, or his substitutes, may do
or cause to be done by virtue hereof.
Pursuant to the requirements of the Securities Act of 1933, this registration statement has
been signed below by the following persons in the capacities and on the dates indicated.
Signature
Title
Date
/s/ Steven Goldman
Steven Goldman
President, Chief Executive Officer
and Director (Principal Executive
Officer)
January 16, 2007
/s/ Stuart W. Fuhlendorf
Stuart W. Fuhlendorf
Chief Financial Officer and Vice
President of Finance (Principal
Accounting and Financial Officer)
January 16, 2007
/s/  Sujal M. Patel
Sujal M. Patel
Chief Technology Officer and Director
January 16, 2007
/s/ Elliott H. Jurgensen, Jr.
Elliott H. Jurgensen, Jr.
Director
January 16, 2007
/s/ William D. Ruckelshaus
William D. Ruckelshaus
Chairman of the Board and Director
January 16, 2007
/s/ Gregory L. McAdoo
Gregory L. McAdoo
Director
January 16, 2007
/s/ Barry J. Fidelman
Barry J. Fidelman
Director
January 16, 2007
/s/ Matthew S. McIlwain
Matthew S. McIlwain
Director
January 16, 2007
/s/ James G. Richardson
James G. Richardson
Director
January 16, 2007
II-5
Table of Contents
INDEX TO EXHIBITS
Exhibit
Number
Description
4.1
(1)
Amended and Restated Certificate of Incorporation.
4.2
(2)
Amended and Restated Bylaws.
4.1
(3)
Amended and Restated 2001 Stock Plan.
4.2
(4)
Form of Stock Option Agreement under the Amended and Restated 2001 Stock Plan.
4.3
(5)
2006 Employee Stock Purchase Plan.
4.4
(6)
Subscription Agreement under the 2006 Employee Stock Purchase Plan.
4.5
(7)
2006 Equity Incentive Plan.
4.6
(8)
Form of Stock Option Agreement under the 2006 Equity Incentive Plan.
5.1
Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation.
23.1
Consent of PricewaterhouseCoopers LLP, Independent Registered Public Accounting Firm.
23.2
Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation (see Exhibit 5.1).
24.1
Power of Attorney (see page II-5).
(1)
Incorporated by reference from Exhibit 3.1 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on September 1, 2006.
(2)
Incorporated by reference from Exhibit 3.2 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on September 1, 2006.
(3)
Incorporated by reference from Exhibit 10.2 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on September 1, 2006.
(4)
Incorporated by reference from Exhibit 10.3 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on September 1, 2006.
(5)
Incorporated by reference from Exhibit 10.6 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on November 24, 2006.
(6)
Incorporated by reference from Exhibit 10.7 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on November 24, 2006.
(7)
Incorporated by reference from Exhibit 10.5 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on November 24, 2006.
(8)
Incorporated by reference from Exhibit 10.4 to the Registrant's registration
statement (No. 333-137078) on Form S-1, as amended, filed on November 24, 2006.