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      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 14pt; FONT-FAMILY: Times New Roman">UNITED
STATES</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 14pt; FONT-FAMILY: Times New Roman">SECURITIES
AND EXCHANGE COMMISSION</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">WASHINGTON,
D.C. 20549</font></div>
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      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 20pt; FONT-FAMILY: Times New Roman">FORM
8-K</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 14pt; FONT-FAMILY: Times New Roman">CURRENT
REPORT</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: normal; FONT-SIZE: 13pt; FONT-FAMILY: Times New Roman">Pursuant
to Section 13 or 15(d) of the Securities Exchange Act of 1934</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><font style="FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><font style="FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><font style="FONT-SIZE: 14pt; FONT-FAMILY: Times New Roman"><font style="FONT-SIZE: 13pt; FONT-FAMILY: Times New Roman">Date of Report (Date of
Earliest Event Reported):&#160;&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 13pt; FONT-FAMILY: Times New Roman; TEXT-DECORATION: none">April
22, 2008</font></font></font></font></font></font></font></div>
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      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 24pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: none">Isilon Systems,
Inc.</font></font></div>
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name of registrant as specified in its charter)</font></div>
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other jurisdiction of incorporation)</font></div>
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315-7500</font></div>
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telephone number, including area code)</font></div>
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      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
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Applicable</font></font></div>
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name or former address, if changed since last report)</font></div>
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      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
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appropriate box below if the Form 8-K filing is intended to simultaneously
satisfy the filing obligation of the registrant under any of the following
provisions:</font></div>
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      communications pursuant to Rule 425 under the Securities Act (17 CFR
      230.425)</font></div>
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      communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
      240.14d-2(b))</font></div>
              </td>
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              <td align="left" valign="top" width="7%">
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      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">
        <div>&#160;</div>
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        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><a name="toc"><br></a></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman; TEXT-DECORATION: underline">TABLE
OF CONTENTS</font></font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><a href="#item5">Item 5.03.&#160; Amendment to Articles of Incorporation or Bylaws;
Change&#160;in Fiscal Year</a></font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><a href="#Signatures"><font style="FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">SIGNATURES</font></a></div>
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        <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
      </div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><br>&#160;</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><a name="item5"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">Item
5.03. Amendment to Articles of Incorporation or Bylaws; Change in Fiscal
Year</font></a></font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">
          <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        </div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">
          <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
          <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">
            <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">On April
22, 2008, the board of directors of Isilon Systems, Inc. approved a change in
the company&#8217;s fiscal year from a 52/53-week fiscal year ending on the Sunday
closest to December 31 to a calendar year.</font></font></font></div>
            <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">This is
not deemed a change in fiscal year for purposes of reporting subject to Rule
13a-10 or Rule 15d-10 of the Securities Exchange Act of 1934, as amended, as the
new fiscal year commences within seven days of the prior fiscal year-end, and
the new fiscal year commences with the end of the prior fiscal year.
Accordingly, the company will not be filing a transition report; instead, the
fiscal year 2008 will include the one-day transition period of December 31,
2007.</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><a name="Signatures">SIGNATURES</a></font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
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to the requirements of the Securities Exchange Act of 1934, the registrant has
duly caused this report to be signed on its behalf by the undersigned hereunto
duly authorized.</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
      <div>
        <table cellpadding="0" cellspacing="0" width="100%">
            <tr>
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              <td align="left" valign="top" width="9%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: times new roman">&#160;
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      Systems, Inc.</font></div>
              </td>
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            <tr>
              <td align="left" valign="top" width="46%"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
              <td align="left" valign="top" width="9%"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
              <td align="left" valign="top" width="45%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: times new roman">(Registrant)</font></div>
              </td>
            </tr>
            <tr>
              <td align="left" valign="top" width="46%"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
              <td align="left" valign="top" width="9%"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
              <td align="left" valign="top" width="45%"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
            </tr>
            <tr>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: times new roman">Date:&#160;&#160;April&#160;25,
      2008</font></div>
              </td>
              <td align="left" valign="top" width="9%" style="PADDING-BOTTOM: 2px">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: times new roman">By:</font></div>
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      M. Conder</font></font></font></div>
              </td>
            </tr>
            <tr>
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      </font></td>
              <td align="left" valign="top" width="9%"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
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      M. Conder</font></div>
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              <td align="left" valign="top" width="46%"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-STYLE: normal; FONT-FAMILY: times new roman">&#160;
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              <td align="left" valign="top" width="9%"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-STYLE: normal; FONT-FAMILY: times new roman">&#160;
      </font></td>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-STYLE: normal; FONT-FAMILY: times new roman">VP
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              </td>
            </tr>
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      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
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form8k.htm
UNITED
STATES
SECURITIES
AND EXCHANGE COMMISSION
WASHINGTON,
D.C. 20549
FORM
8-K
CURRENT
REPORT
Pursuant
to Section 13 or 15(d) of the Securities Exchange Act of 1934
Date of Report (Date of
Earliest Event Reported):
April
22, 2008
Isilon Systems,
Inc.
(Exact
name of registrant as specified in its charter)
Delaware
(State or
other jurisdiction of incorporation)
001-33196
91-2101027
(Commission
      File Number)
(IRS
      Employer Identification No.)
3101
      Western Avenue, Seattle, Washington
98121
(Address
      of principal executive offices)
(Zip
      Code)
(206)
315-7500
(Registrant's
telephone number, including area code)
Not
Applicable
(Former
name or former address, if changed since last report)
Check the
appropriate box below if the Form 8-K filing is intended to simultaneously
satisfy the filing obligation of the registrant under any of the following
provisions:
[   
      ]
Written
      communications pursuant to Rule 425 under the Securities Act (17 CFR
      230.425)
[   
      ]
Soliciting
      material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      140.14a-12)
[   
      ]
Pre-commencement
      communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
      240.14d-2(b))
[   
      ]
Pre-commencement
      communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
      240.13e-4(c))
TABLE
OF CONTENTS
Item 5.03.  Amendment to Articles of Incorporation or Bylaws;
Change in Fiscal Year
SIGNATURES
Item
5.03. Amendment to Articles of Incorporation or Bylaws; Change in Fiscal
Year
On April
22, 2008, the board of directors of Isilon Systems, Inc. approved a change in
the company's fiscal year from a 52/53-week fiscal year ending on the Sunday
closest to December 31 to a calendar year.
This is
not deemed a change in fiscal year for purposes of reporting subject to Rule
13a-10 or Rule 15d-10 of the Securities Exchange Act of 1934, as amended, as the
new fiscal year commences within seven days of the prior fiscal year-end, and
the new fiscal year commences with the end of the prior fiscal year.
Accordingly, the company will not be filing a transition report; instead, the
fiscal year 2008 will include the one-day transition period of December 31,
2007.
SIGNATURES
Pursuant
to the requirements of the Securities Exchange Act of 1934, the registrant has
duly caused this report to be signed on its behalf by the undersigned hereunto
duly authorized.
Isilon
      Systems, Inc.
(Registrant)
Date:  April 25,
      2008
By:
/s/
Keenan
      M. Conder
Keenan
      M. Conder
VP
      General Counsel and Secretary