<SUBMISSION>
<ACCESSION-NUMBER>0000950153-08-000652
<TYPE>NT 10-K
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20080203
<FILING-DATE>20080404
<DATE-OF-FILING-DATE-CHANGE>20080404
<EFFECTIVENESS-DATE>20080404
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>CSK AUTO CORP
<CIK>0001051848
<ASSIGNED-SIC>5531
<IRS-NUMBER>860765798
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>0204
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>NT 10-K
<ACT>34
<FILE-NUMBER>001-13927
<FILM-NUMBER>08741401
</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>
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<DOCUMENT>
<TYPE>NT 10-K
<SEQUENCE>1
<FILENAME>p75180ntnt10vk.htm
<DESCRIPTION>NT 10-K
<TEXT>
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<TD align="center" valign="top" style="border-top: 1px solid #000000">OMB APPROVAL</TD>
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<TD valign="top" style="border-top: 1px solid #000000"><DIV style="margin-left:0px; text-indent:-0px">OMB Number:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3235-0058
</DIV></TD>
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<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Expires:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;April&nbsp;30, 2009</DIV></TD>
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<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Estimated average <br>burden
hours per response  . . . 2.50</DIV></TD>
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<TD align="center" valign="top" style="border-top: 1px solid #000000">SEC FILE NUMBER<BR>001-13927</TD>
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<TD align="center" valign="top" style="border-top: 1px solid #000000">CUSIP NUMBER<BR>125965103</TD>
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<DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>UNITED STATES<BR>
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: 18pt; margin-top: 12pt"><B>FORM 12b-25</B>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>Commission File Number: 001-13927</B></DIV>



<DIV align="center" style="font-size: 12pt; margin-top: 0pt"><B>NOTIFICATION OF LATE FILING</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">(Check
One): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT face="Wingdings">&#254;</FONT> Form&nbsp;10-K&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT face="Wingdings">&#111;</FONT> Form&nbsp;20-F &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT face="Wingdings">&#111;</FONT> Form 11-K &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<FONT face="Wingdings">&#111;</FONT> Form 10-Q &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT face="Wingdings">&#111;</FONT> Form 10-D &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT face="Wingdings">&#111;</FONT> Form&nbsp;N-SAR<br>
For Period Ended:<U> February&nbsp;3, 2008</U>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;<FONT face="Wingdings">&#111;</FONT> Transition Report on Form&nbsp;10-K<BR>
&nbsp;&nbsp;<FONT face="Wingdings">&#111;</FONT> Transition Report on Form&nbsp;20-F<BR>
&nbsp;&nbsp;<FONT face="Wingdings">&#111;</FONT> Transition Report on Form&nbsp;11-K<BR>
&nbsp;&nbsp;<FONT face="Wingdings">&#111;</FONT> Transition Report on Form&nbsp;10-Q<BR>
&nbsp;&nbsp;<FONT face="Wingdings">&#111;</FONT> Transition Report on Form&nbsp;N-SAR

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">For the Transition Period Ended:<U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><I>Read Instruction (on back page) Before Preparing Form. Please Print or Type.</I>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Nothing in this form shall be construed to imply that the Commission has verified any
information contained herein.</B><br>
If the notification relates to a portion of the filing checked above, identify the Item(s) to which
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: 6pt">CSK Auto Corporation
</DIV>


<DIV align="left" style="font-size: 10pt"><DIV style="width: 100%; border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></DIV>



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


<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><DIV style="width: 100%; border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></DIV>


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


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">645 E. Missouri Ave. Suite&nbsp;400
</DIV>


<DIV align="left" style="font-size: 10pt"><DIV style="width: 100%; border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></DIV>



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


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Phoenix, Arizona 85012
</DIV>


<DIV align="left" style="font-size: 10pt"><DIV style="width: 100%; border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></DIV>



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


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>PART II &#151; RULE 12b-25 (b)&nbsp;AND (c)</B><BR>
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 align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT face="Wingdings">&#254;</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">(a) The reasons described in reasonable detail in Part III of this form could not be eliminated without
unreasonable effort or expense;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">(b) The subject annual report, semi-annual report, transition report on Form&nbsp;10-K, Form&nbsp;20-F, Form&nbsp;11-K or
Form&nbsp;N-SAR or <BR>
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
portion thereof will be filed on or before the fifth calendar day following the prescribed due date; and</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">(c) 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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</DIV>


<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>







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







<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>PART III &#151; NARRATIVE</B><BR>
State below in reasonable detail why Forms 10-K, 20-F, 11-K, 10-Q, 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">CSK Auto Corporation (the &#147;Company&#148;) was not able to timely file its Annual Report on Form 10-K
(the &#147;2007 10-K&#148;) for the fiscal year ended February&nbsp;3, 2008 (&#147;fiscal 2007&#148;) by April&nbsp;3, 2008, the
prescribed due date, because of recent developments related to the matter discussed below that the
Company is in the process of addressing and which have diverted necessary resources from the
completion of the 2007 10-K.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">In January&nbsp;2008, the Company&#146;s Board of Directors engaged JPMorgan to assist it in developing and
evaluating strategic alternatives to preserve and maximize shareholder value. As part of that
process, more than twenty parties, including companies in the automotive parts industry and
financial investors, as well as parties seeking to enter control and non-control transactions with
the Company, were granted access to non-public information about the Company. This strategic
review process resulted in the execution of an Agreement and Plan of Merger with O&#146;Reilly
Automotive, Inc. on April&nbsp;1, 2008 (the &#147;Merger Agreement&#148;). This strategic review process and
subsequent negotiation of the Merger Agreement have diverted necessary resources from the
completion of our consolidated financial statements and the 2007 10-K.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The Company intends to file the 2007 10-K as promptly as practicable, and expects that such filing
will be made by the April&nbsp;18, 2008 extended deadline.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>PART IV &#151; OTHER INFORMATION</B><BR>
(1)&nbsp;Name and telephone number of person to contact in regard to this notification
</DIV>

<DIV align="center">
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    <TD width="30%">&nbsp;</TD>
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    <TD width="30%">&nbsp;</TD>
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<TR valign="bottom">
    <TD align="center" valign="top">Randi Val Morrison
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">602
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">631-7139</TD>
</TR>
<TR style="font-size: 1px">
    <TD align="center" valign="top" style="border-top: 1px solid #000000">&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top" style="border-top: 1px solid #000000">&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">(Name)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">(Area Code)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">(Telephone Number)</TD>
</TR>
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</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">(2)&nbsp;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
months or for such shorter period that the registrant was required to file such report(s) been
filed? If the answer is no, identify report(s).
</DIV>


<DIV align="right" style="font-size: 10pt; margin-top: 12pt"><FONT face="Wingdings">&#254;</FONT>
Yes <FONT face="Wingdings">&#111;</FONT> No
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">(3)&nbsp;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?
</DIV>


<DIV align="right" style="font-size: 10pt; margin-top: 12pt"><FONT face="Wingdings">&#254;</FONT>
Yes <FONT face="Wingdings">&#111;</FONT> No
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">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.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">For fiscal 2007, we expect to report net sales of $1,851.6&nbsp;million, representing a decrease of 2.9%
in total net sales compared to net sales of $1,907.8&nbsp;million reported for fiscal year ended
February&nbsp;4, 2007 (&#147;fiscal 2006&#148;). We expect to report that same store sales for fiscal 2007
decreased 2.7% compared to fiscal 2006, consisting of a decrease of 4.4% in retail sales and an
increase of 5.8% in commercial sales. The decrease in net sales was primarily due to one
additional week of sales in the 2006 fiscal year, which resulted in additional net sales of
approximately $34.3&nbsp;million.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">We expect
gross profit for fiscal 2007 to decrease 3.2%, or
    $29.1&#160;million, compared to fiscal 2006. We expect gross
profit to be $867.0&#160;million, or 46.8% of net sales, for fiscal 2007, as
    compared to $896.1&#160;million, or 47.0% of net sales, for
    fiscal 2006. The decrease in gross profit dollars was primarily
    the result of the decline in sales and lower vendor allowances,
    partially offset by a reduction in shrink expense in fiscal
    2007. The decrease in the gross profit percentage for fiscal
    2007 as compared to fiscal 2006 was caused by a number of
    factors, including sales mix and a higher level of clearance
    activity in fiscal 2007 compared to fiscal 2006, higher
    warehousing and distribution costs, higher warranty costs, and
    an increase in commercial sales, which carry lower gross profit
    percentages. These factors were partially offset by an increase
    in the aforementioned reduction in shrink expense in fiscal 2007
    as compared to fiscal 2006.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Our operating profit and net income for fiscal 2006 were $80.4&nbsp;million and $6.3&nbsp;million,
respectively. Although we have not finalized our financial statements for
fiscal 2007, we expect to report a decline in operating profit
relative to fiscal 2006 and a net loss for fiscal 2007. The decrease in
operating profit for fiscal 2007 was primarily
attributable to the decrease in gross profit discussed above and an increase in
operating and administrative expenses based on a full year
of operating costs from the 55 net new stores added in fiscal 2006, operating costs from 17 net new
stores added in fiscal 2007 and increases in certain other costs.
Operating and administrative cost increases in
fiscal 2007 were partially offset by higher costs in fiscal 2006 due to the 53<SUP style="font-size: 85%; vertical-align: text-top">rd</SUP> week
included in fiscal 2006, as well as a decrease in bonuses in fiscal 2007.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Interest expense is expected to be $54.2&nbsp;million for fiscal 2007, compared to $48.8&nbsp;million
reported for fiscal 2006, as our amendments to our term loan facility in fiscal 2007 and
refinancing activities in fiscal 2006 increased our interest rates. In fiscal 2006, we recorded a
$19.5&nbsp;million loss on debt retirement. We do not expect to
report a loss on debt retirement in fiscal 2007.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">With respect to management&#146;s assessment of the effectiveness of internal control over financial
reporting as of February&nbsp;3, 2008, the Company expects to report that it has remediated certain of
the material weaknesses identified in its Annual Report on Form 10-K for fiscal 2006 (the &#147;2006
10-K&#148;). The Company has determined that certain material weaknesses continue to exist and, as a
result, management has concluded that the Company did not maintain effective internal control over
financial reporting as of February&nbsp;3, 2008.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Certain statements contained in this Form 12b-25 are forward-looking statements and are usually
identified by words such as &#147;may,&#148;
</DIV>


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

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<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&#147;will,&#148; &#147;expect,&#148; &#147;anticipate,&#148; &#147;believe,&#148; &#147;estimate,&#148; &#147;continue,&#148; &#147;could,&#148; &#147;should&#148; or other
similar expressions. We intend forward-looking statements to be covered by the safe harbor
provisions for forward- looking statements contained in the Private Securities Litigation Reform
Act of 1995. These forward-looking statements reflect current views about our plans, strategies and
prospects and speak only as of the date of this Form 12b-25.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">We believe that it is important to communicate our future expectations to our investors. However,
forward-looking statements are subject to risks, uncertainties and assumptions often beyond our
control, including, but not limited to, competitive pressures, the overall condition of the
national and regional economies, factors affecting import of products, factors impacting consumer
spending and driving habits such as high gas prices, war and terrorism, natural disasters and/or
extended periods of inclement weather, consumer debt levels and inflation, demand for our products,
integration and management of any past and future acquisitions, conditions affecting new store
development, relationships with vendors, risks related to compliance with Section&nbsp;404 of the
Sarbanes-Oxley Act of 2002 (&#147;SOX&#148; and such Section, &#147;SOX 404&#148;) and litigation and regulatory
matters. Actual results may differ materially from anticipated results described in these
forward-looking statements. For more information related to these and other risks, please refer to
the Risk Factors section in the 2006 10-K. In addition to causing our actual results to differ, the
factors listed and referred to above may cause our intentions to change from those statements of
intention set forth in this Form 12b-25. Such changes in our intentions may cause our results to
differ. We may change our intentions at any time and without notice based upon changes in such
factors, our assumptions or otherwise.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Except as required by applicable law, we do not intend and undertake no obligation to update
publicly any forward-looking statements, whether as a result of new information, future events or
otherwise. Given the uncertainties and risk factors that could cause our actual results to differ
materially from those contained in any forward-looking statement, you should not place undue
reliance upon forward-looking statements and should carefully consider these risks and
uncertainties, together with the other risks described from time to time in our other reports and
documents filed with the SEC.
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">CSK Auto Corporation
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">(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 thereunto duly
authorized.
</DIV>


<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">&nbsp;</TD>
    <TD colspan="3" align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">Date: April 4, 2008 &nbsp;</TD>
    <TD valign="top">By:&nbsp;&nbsp;</TD>
    <TD colspan="2" style="border-bottom: 1px solid #000000" align="left">/s/ James D. Constantine
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">James D. Constantine&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Executive Vice President of Finance and Chief
Financial Officer&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
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<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>ATTENTION</B>
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<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Intentional misstatements or omissions of fact constitute Federal criminal violations (</B><B><I>see </I></B><B>18
U.S.C. 1001).</B>
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