<SUBMISSION>
<ACCESSION-NUMBER>0000950153-06-000991
<TYPE>NT 10-K
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20060129
<FILING-DATE>20060414
<DATE-OF-FILING-DATE-CHANGE>20060414
<EFFECTIVENESS-DATE>20060414
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>CSK AUTO CORP
<CIK>0001051848
<ASSIGNED-SIC>5531
<IRS-NUMBER>860765798
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>0131
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>NT 10-K
<ACT>34
<FILE-NUMBER>001-13927
<FILM-NUMBER>06760377
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>645 E MISSOURI AVENUE
<CITY>PHOENIX
<STATE>AZ
<ZIP>85012
<PHONE>6022659200
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>645 E MISSOURI AVENUE
<CITY>PHOENIX
<STATE>AZ
<ZIP>85012
</MAIL-ADDRESS>
</FILER>
<DOCUMENT>
<TYPE>NT 10-K
<SEQUENCE>1
<FILENAME>p72178ntnt10vk.htm
<DESCRIPTION>NT 10-K
<TEXT>
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<HEAD>
<TITLE>nt10vk</TITLE>
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<TD width="1%" style="border-left: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
<TD align="center" valign="top" style="border-top: 1px solid #000000">OMB APPROVAL</TD>
<TD width="1%" style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD width="1%" style="border-left: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
<TD valign="top" style="border-top: 1px solid #000000"><DIV style="margin-left:0px; text-indent:-0px">OMB Number:&nbsp;3235-0058</DIV></TD>
<TD width="1%" style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD width="1%" style="border-left: 1px solid #000000">&nbsp;</TD>
<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Expires:&nbsp;March&nbsp;31, 2006</DIV></TD>
<TD width="1%" style="border-right: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD width="1%" style="border-left: 1px solid #000000">&nbsp;</TD>
<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Estimated average burden
hours per response ... 2.50</DIV></TD>
<TD width="1%" style="border-right: 1px solid #000000">&nbsp;</TD>
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<TR valign="bottom">
<TD width="1%" style="border-left: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
<TD align="center" valign="top" style="border-top: 1px solid #000000">SEC FILE NUMBER</TD>
<TD width="1%" style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD width="1%" style="border-left: 1px solid #000000">&nbsp;</TD>
<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">001-13927</DIV></TD>
<TD width="1%" style="border-right: 1px solid #000000">&nbsp;</TD>
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<TR valign="bottom" style="font-size: 2pt">
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</TR>
<TR valign="bottom">
<TD width="1%" style="border-left: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
<TD align="center" valign="top" style="border-top: 1px solid #000000">CUSIP NUMBER</TD>
<TD width="1%" style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD width="1%" style="border-left: 1px solid #000000">&nbsp;</TD>
<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"></DIV></TD>
<TD width="1%" style="border-right: 1px solid #000000">&nbsp;</TD>
</TR>

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</DIV>

<DIV align="center" style="font-size: 12pt; margin-top: 1pt"><B>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION<BR>
Washington, D.C. 20549</B>
</DIV>

<DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>FORM 12b-25</B>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 12pt"><B>NOTIFICATION OF LATE FILING</B>
</DIV>




<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
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<TD width="10%">&nbsp;</TD>
<TD width="2%">&nbsp;</TD>
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<TD width="2%">&nbsp;</TD>
<TD width="69%">&nbsp;</TD>
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<TR valign="bottom">
<TD nowrap valign="top"><I>(Check one):</I></TD>
<TD>&nbsp;</TD>
<TD colspan="4" valign="top" align="left">
<FONT face="wingdings">&#254;</FONT>&nbsp; Form&nbsp;10-K
<FONT face="wingdings">&#111;</FONT>&nbsp; Form&nbsp;20-F
<FONT face="wingdings">&#111;</FONT>&nbsp; Form&nbsp;11-K
<FONT face="wingdings">&#111;</FONT>&nbsp; Form&nbsp;10-Q
<FONT face="wingdings">&#111;</FONT>&nbsp; Form&nbsp;10-D
<FONT face="wingdings">&#111;</FONT>&nbsp; Form&nbsp;N-SAR
<FONT face="wingdings">&#111;</FONT>&nbsp; Form&nbsp;N-CSR
</TD>
</TR>
<TR valign="bottom" style="line-height: 6pt"><!-- Blank Space -->
<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>
</TR>
<TR valign="bottom">
<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
<TD>&nbsp;</TD>
<TD nowrap align="left" valign="top">For Period Ended:</TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top" colspan="2">January 29, 2006</TD>
</TR>
<TR style="font-size: 1px">
<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 colspan="3" align="left" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom" style="line-height: 3pt"><!-- Blank Space -->
<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>
</TR>
<TR valign="bottom">
<TD valign="top">&nbsp;</TD>
<TD>&nbsp;</TD>
<TD colspan="3" valign="top" align="left"><FONT face="wingdings">&#111;</FONT>&nbsp;&nbsp; Transition Report on Form&nbsp;10-K</TD>
<TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="line-height: 3pt"><!-- Blank Space -->
<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>
</TR>
<TR valign="bottom">
<TD valign="top">&nbsp;</TD>
<TD>&nbsp;</TD>
<TD colspan="3" valign="top" align="left"><FONT face="wingdings">&#111;</FONT>&nbsp;&nbsp; Transition Report on Form&nbsp;20-F</TD>
<TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="line-height: 3pt"><!-- Blank Space -->
<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>
</TR>
<TR valign="bottom">
<TD valign="top">&nbsp;</TD>
<TD>&nbsp;</TD>
<TD colspan="3" valign="top" align="left"><FONT face="wingdings">&#111;</FONT>&nbsp;&nbsp; Transition Report on Form&nbsp;11-K</TD>
<TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="line-height: 3pt"><!-- Blank Space -->
<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>
</TR>
<TR valign="bottom">
<TD valign="top">&nbsp;</TD>
<TD>&nbsp;</TD>
<TD colspan="3" valign="top" align="left"><FONT face="wingdings">&#111;</FONT>&nbsp;&nbsp; Transition Report on Form&nbsp;10-Q</TD>
<TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="line-height: 3pt"><!-- Blank Space -->
<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>
</TR>
<TR valign="bottom">
<TD valign="top">&nbsp;</TD>
<TD>&nbsp;</TD>
<TD nowrap colspan="3" valign="top" align="left"><FONT face="wingdings">&#111;</FONT>&nbsp;&nbsp; Transition Report on Form&nbsp;N-SAR</TD>
<TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="line-height: 6pt"><!-- Blank Space -->
<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>
</TR>
<TR valign="bottom">
<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
<TD>&nbsp;</TD>
<TD colspan="2" align="left" valign="top" nowrap>For the Transition Period Ended:
</TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top"></TD>
<TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
<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 colspan="2" align="left" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
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</TABLE>
</DIV>
<P>
<DIV style="width: 100%; border: 1px solid black; padding: 12px;">

<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><I>Read Instruction (on back page) Before Preparing Form. Please Print or Type.</I>
</DIV>

<DIV align="center" style="font-size: 10pt"><B>Nothing in this form shall be construed to imply that the Commission has verified any information contained herein.</B></DIV>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">If the notification relates to a portion of the filing checked above, identify the Item(s) to which
the notification relates:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>PART I &#151; REGISTRANT INFORMATION</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 18pt">CSK Auto Corporation<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 2pt">Full Name of Registrant
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 18pt"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 2pt">Former Name if Applicable
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 18pt">645 E. Missouri Ave. Suite 400<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 2pt">Address of Principal Executive Office <I>(Street and Number)</I>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 18pt">Phoenix, Arizona 85012<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 2pt">City, State and Zip Code
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>PART II &#151; RULES 12b-25(b) AND (c)</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">If the subject report could not be filed without unreasonable effort or expense and the registrant seeks relief pursuant to Rule&nbsp;12b-25(b), the following should be completed. (Check box if appropriate)
</DIV>

<DIV align="center">
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<TR valign="bottom">
<TD width="5%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD><!-- VRule -->
<TD width="1%">&nbsp;</TD>
<TD width="3%">&nbsp;</TD>
<TD width="2%">&nbsp;</TD>
<TD width="88%">&nbsp;</TD>
</TR>
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<TR valign="bottom">
<TD valign="middle" rowspan="5"><DIV style="margin-left:15px; text-indent:-0px"><FONT face="wingdings">&#111;</FONT></DIV></TD>
</TR>

<TR valign="bottom">
<TD style="border-right: 1px solid #000000">&nbsp;</TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">(a)
</TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">The reason described in reasonable detail in Part III of this form could not be
eliminated without unreasonable effort or expense</TD>
</TR>


<TR valign="bottom" style="line-height: 3pt"><!-- Blank Space -->
<TD style="border-right: 1px solid #000000">&nbsp;</TD>
<TD align="left" valign="top">&nbsp;</TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD style="border-right: 1px solid #000000">&nbsp;</TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">(b)
</TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">The subject annual report, semi-annual report, transition report on Form&nbsp;10-K, Form&nbsp;20-F, Form&nbsp;11-K, Form&nbsp;N-SAR or Form&nbsp;N-CSR, or portion thereof, will be filed on or before the fifteenth calendar day following the prescribed due date; or the subject quarterly report or transition report on Form&nbsp;10-Q or subject distribution report on Form&nbsp;10-D, or portion thereof, will be filed on or before the fifth calendar day following the prescribed due date; and </TD>
</TR>
<TR valign="bottom" style="line-height: 3pt"><!-- Blank Space -->
<TD style="border-right: 1px solid #000000">&nbsp;</TD>
<TD align="left" valign="top">&nbsp;</TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD>&nbsp;</TD>
<TD style="border-right: 1px solid #000000">&nbsp;</TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">(c)
</TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">The accountant&#146;s statement or other exhibit required by Rule&nbsp;12b-25(c) has been attached if applicable.</TD>
</TR>
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</TABLE>
</DIV>



<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>PART III &#151; NARRATIVE</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">State below in reasonable detail why Forms 10-K, 20-F, 11-K, 10-Q, 10-D, N-SAR, N-CSR, or the transition report or portion thereof, could not be filed within the prescribed time period.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The Company will not be able to file its Annual Report on Form 10-K (&#147;2005 10-K&#148;) for the fiscal year ended
January&nbsp;29, 2006 (&#147;fiscal 2005&#148;) by April&nbsp;14, 2006, the prescribed due date. The Company intends to
file the 2005 10-K as promptly as practicable, but does not expect that such filing will be made by
its May&nbsp;1, 2006 extended deadline.

<P>The Company has previously disclosed in a Form 8-K filed March&nbsp;27, 2006 an Audit Committee-led
internal investigation (the &#147;Investigation&#148;) primarily relating to accounting for inventory and
vendor allowances. In order to account properly for the impact of the errors identified in
connection with the Investigation to date, the Company previously disclosed that it expects that
its financial results for each of the three fiscal years 2002, 2003 and 2004, selected consolidated
financial data for each of the five fiscal years 2000 through 2004 and interim financial
information for each of its quarters in fiscal year 2004 and for the first three quarters of fiscal
2005, will be restated and that the financial statements for these periods should no longer be
relied upon.

<P>Until the Investigation is substantially complete, the Company will be unable to complete its
financial statements for fiscal 2005, including any necessary restatements, and the related work on
assessing its internal control over financial reporting under Section&nbsp;404 of the Sarbanes-Oxley Act
of 2002.

<P>As previously disclosed, the Company will be evaluating whether any of the matters identified
in the course of the Investigation were the result of one or more material weaknesses in its
internal controls in addition to those previously reported in its Annual Report on Form 10-K for the fiscal year ended January 30, 2005 (&#147;fiscal 2004&#148;). Based on current
information, the Company would expect to identify additional material weaknesses in its internal
controls at January&nbsp;29, 2006. The Company will conclude its analyses and report its findings in
this regard when it is prepared to file its 2005 10-K.</DIV>


<DIV align="left" style="margin-top: 12pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; background: transparent; color: #000000">
<TR>
<TD width="15%"></TD>
<TD width="1%"></TD>
<TD width="84"></TD>
</TR>
<TR valign="top">
<TD valign="middle" nowrap align="left">SEC 1344 (03-05)</TD>
<TD>&nbsp;</TD>
<TD><B>Persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.</B></TD>
</TR>
</TABLE>
</DIV>



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

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<DIV style="font-size: 10pt; font-family: 'Times New Roman',Times,serif">




<DIV align="center" style="font-size: 10pt; margin-top: 6pt">(Attach extra Sheets if Needed)<BR>
<B>PART IV &#151; OTHER INFORMATION</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="1%" nowrap align="left">(1)</TD>
<TD width="1%">&nbsp;</TD>
<TD>Name and telephone number of person to contact in regard to this notification</TD>
</TR>
</TABLE>
</DIV>
<DIV align="right">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="98%">
<!-- Begin Table Head -->
<TR valign="bottom">
<TD width="47%">&nbsp;</TD>
<TD width="5%">&nbsp;</TD>
<TD width="8%">&nbsp;</TD>
<TD width="5%">&nbsp;</TD>
<TD width="35%">&nbsp;</TD>
</TR>
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<TR style="font-size: 10pt">
<TD align="center" valign="top" style="border-bottom: 1px solid #000000">James B. Riley&nbsp;</TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top" style="border-bottom: 1px solid #000000">(602)&nbsp;</TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top" style="border-bottom: 1px solid #000000">631-7688&nbsp;</TD>
</TR>
<TR valign="bottom">
<TD valign="top" align="center"><DIV style="margin-left:0px; text-indent:-0px">(Name)</DIV></TD>
<TD>&nbsp;</TD>
<TD nowrap align="center" valign="bottom">(Area Code)
</TD>
<TD>&nbsp;</TD>
<TD align="center" valign="bottom">(Telephone Number)</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</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="1%" nowrap align="left">(2)</TD>
<TD width="1%">&nbsp;</TD>
<TD>Have all other periodic reports required under Section&nbsp;13 or 15(d) of the Securities Exchange Act of 1934 or Section&nbsp;30 of the Investment Company Act of 1940 during the preceding 12&nbsp;months or for such shorter period that the registrant was required to file such report(s) been filed? If answer is no, identify report(s).</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent; margin-top: 1pt">
<TD width="1%" nowrap align="left">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD align="right">Yes&nbsp;<FONT face="wingdings">&#254;</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No&nbsp;<FONT face="wingdings">&#111;</FONT></TD>
</TR>

<TR>
<TD style="font-size: 6pt">&nbsp;</TD>
</TR>

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
<TD width="1%" nowrap align="left">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD><DIV style="border-bottom: 1px solid #000000; font-size: 10pt">&nbsp;</DIV></TD>
</TR>

</TABLE>
</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="1%" nowrap align="left">(3)</TD>
<TD width="1%">&nbsp;</TD>
<TD>Is it anticipated that any significant change in results of operations from the corresponding period for the last fiscal year will be reflected by the earnings statements to be included in the subject report or portion thereof?</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent; margin-top: 1pt">
<TD width="1%" nowrap align="left">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD align="right">Yes&nbsp;<FONT face="wingdings">&#254;</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No&nbsp;<FONT face="wingdings">&#111;</FONT></TD>
</TR>

<TR>
<TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
<TD width="1%" nowrap align="left">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD><DIV style="border-bottom: 1px solid #000000; font-size: 10pt">&nbsp;</DIV></TD>
</TR>


<TR>
<TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
<TD width="1%" nowrap align="left">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD>If so, attach an explanation of the anticipated change, both narratively and quantitatively, and, if appropriate, state the reasons why a reasonable estimate of the results cannot be made.</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
<TD width="1%" nowrap align="left">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD>&nbsp;</TD>
</TR>
</TABLE>
</DIV>

<DIV style="border-bottom: 1px solid #000000; font-size: 10pt">In light of the ongoing Investigation, other than the preliminary net sales for the Company as
discussed below, the Company must defer release of its financial results for the fourth quarter and
full year fiscal 2005. Net sales for fiscal 2005, including sales derived from the Murray&#146;s stores
for the period December&nbsp;19, 2005 through January&nbsp;29, 2006, increased by approximately $43.7
million, or 2.8%, compared to fiscal 2004.

<p>Same store sales, which exclude the operations of Murray&#146;s, were approximately flat year over
year, consisting of an increase of 8.1% in commercial same store sales and a decline of 1.6% in
retail same store sales. Net sales for the fourth quarter of fiscal 2005 increased by
approximately $5.4&nbsp;million, or 1.4%, compared to the fourth quarter of fiscal 2004. Same store
sales declined 0.2% for the fourth quarter of fiscal 2005, consisting of an increase of 9% in
commercial same store sales and a decline of 2.0% in retail same store sales.

<p>Additional information can be found in the Company&#146;s press release issued and Form 8-K filed
April&nbsp;14, 2006.

<p>The foregoing reflects the Company&#146;s views about the accounting adjustments, its financial
condition, performance and other matters that constitute &#147;forward-looking&#148; statements, as such term
is defined by the federal securities laws. You can find many of these statements by looking for
words such as &#147;may,&#148; &#147;will,&#148; &#147;expect,&#148; &#147;anticipate,&#148; &#147;believe,&#148; &#147;estimate,&#148; &#147;should,&#148; &#147;continue,&#148;
&#147;predict,&#148; &#147;preliminary&#148; and similar words used herein. These forward-looking statements are
subject to the safe harbor protection provided by federal securities laws. These forward-looking
statements are subject to numerous risks, uncertainties and
assumptions. These risks and uncertainties include, but are not limited to, the results and effect of the Company&#146;s review
of its accounting practices, any potential Securities and Exchange Commission or New York Stock
Exchange inquiry with respect to the potential adjustments or the Company&#146;s accounting practices,
the ability of the Company to file its periodic reports, the impact on the Company&#146;s business and
the risks detailed from time to time in the Company&#146;s periodic filings under the Securities
Exchange Act of 1934. Because the statements are subject to risks and uncertainties, actual
developments and results may differ materially from those express or implied by the forward-looking
statements. Readers are cautioned not to place undue reliance on the statements, which speak only
as of the date hereof.</DIV>

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



<DIV align="center" style="font-size: 10pt; margin-top: 24pt"><DIV style="border-bottom: 1px solid #000000; font-size: 10pt; width: 75%">CSK Auto Corporation&nbsp;</DIV>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 2pt">(Name of Registrant as Specified in Charter)
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">has caused this notification to be signed on its behalf by the undersigned hereunto duly authorized.
</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="36%">&nbsp;</TD>
<TD width="10%">&nbsp;</TD>
<TD width="3%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="36%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Date
</DIV></TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">April 14, 2006</TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">By</TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">/s/ James B. Riley</TD>
</TR>
<TR style="font-size: 1px">
<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top" style="border-top: 1px solid #000000">&nbsp;
</TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">&nbsp;</TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top" style="border-top: 1px solid #000000">&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">James B. Riley<BR>Senior Vice
President<BR>Chief Financial Officer</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


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


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