Csk Auto Corp - Amended Statement of Ownership (SC 13G/A)

SC 13G/A

VIKING GLOBAL PERFORMANCE LLC
VIKING GLOBAL INVESTORS LP
VIKING GLOBAL EQUITIES LP
VIKING GLOBAL EQUITIES II LP
O. ANDREAS HALVORSEN
DAVID C. OTT
THOMAS W. PURCELL, JR.
DANIEL J. CAHILL

NASD

0001051848
CSK Auto Corporation
86-0765798

CARL CASLER
203-863-5039

0001132625
j3$jjjjj

SC 13G/A

viking1.txt

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Schedule 13G/A
(Rule 13d-102)

INFORMATION TO BE INCLUDED IN STATEMENTS PURSUANT TO RULES 13d-1(b),(c)
AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2
UNDER THE SECURITIES EXCHANGE ACT OF 1934*
(Amendment No. 2)

CSK Auto Corporation
(Name of Issuer)

Common Stock
(Title of Class of Securities)

125965103
(CUSIP Number)

December 31, 2007
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:
[ ] Rule 13d-1(b)
[X] Rule 13d-1(c)
[ ] Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Schedule 13G/A PAGE 2 OF 14

CUSIP No. 125965103
_____________________________________________________________________________
 (1) NAME OF REPORTING PERSON
 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
 Viking Global Performance LLC
_____________________________________________________________________________
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 (a) [ ]
 (b) [x]
_____________________________________________________________________________
 (3) SEC USE ONLY

_____________________________________________________________________________
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 Delaware
_____________________________________________________________________________

NUMBER OF (5) SOLE VOTING POWER
 0
SHARES ______________________________________________________________

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY ______________________________________________________________

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING ______________________________________________________________

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
_____________________________________________________________________________
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
_____________________________________________________________________________
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0%
_____________________________________________________________________________
 (12) TYPE OF REPORTING PERSON
 OO
_____________________________________________________________________________

Schedule 13G/A PAGE 3 OF 14

CUSIP No. 125965103
_____________________________________________________________________________
 (1) NAME OF REPORTING PERSON
 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
 Viking Global Investors LP
_____________________________________________________________________________
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 (a) [ ]
 (b) [x]
_____________________________________________________________________________
 (3) SEC USE ONLY

_____________________________________________________________________________
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 Delaware
_____________________________________________________________________________

NUMBER OF (5) SOLE VOTING POWER
 0
SHARES ______________________________________________________________

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY ______________________________________________________________

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING ______________________________________________________________

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
_____________________________________________________________________________
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
_____________________________________________________________________________
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0%
_____________________________________________________________________________
 (12) TYPE OF REPORTING PERSON
 PN
_____________________________________________________________________________

Schedule 13G/A PAGE 4 OF 14

CUSIP No. 125965103
_____________________________________________________________________________
 (1) NAME OF REPORTING PERSON
 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
 Viking Global Equities LP
_____________________________________________________________________________
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 (a) [ ]
 (b) [x]
_____________________________________________________________________________
 (3) SEC USE ONLY

_____________________________________________________________________________
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 Delaware
_____________________________________________________________________________

NUMBER OF (5) SOLE VOTING POWER
 0
SHARES ______________________________________________________________

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY ______________________________________________________________

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING ______________________________________________________________

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
_____________________________________________________________________________
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
_____________________________________________________________________________
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0%
_____________________________________________________________________________
 (12) TYPE OF REPORTING PERSON
 PN
_____________________________________________________________________________

Schedule 13G/A PAGE 5 OF 14

CUSIP No. 125965103
_____________________________________________________________________________
 (1) NAME OF REPORTING PERSON
 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
 Viking Global Equities II LP
_____________________________________________________________________________
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 (a) [ ]
 (b) [x]
_____________________________________________________________________________
 (3) SEC USE ONLY

_____________________________________________________________________________
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 Delaware
_____________________________________________________________________________

NUMBER OF (5) SOLE VOTING POWER
 0
SHARES ______________________________________________________________

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY ______________________________________________________________

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING ______________________________________________________________

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
_____________________________________________________________________________
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
_____________________________________________________________________________
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0%
_____________________________________________________________________________
 (12) TYPE OF REPORTING PERSON
 PN
_____________________________________________________________________________

Schedule 13G/A PAGE 6 OF 14

CUSIP No. 125965103
_____________________________________________________________________________
 (1) NAME OF REPORTING PERSON
 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
 O. Andreas Halvorsen
_____________________________________________________________________________
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 (a) [ ]
 (b) [x]
_____________________________________________________________________________
 (3) SEC USE ONLY

_____________________________________________________________________________
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 Norway
_____________________________________________________________________________

NUMBER OF (5) SOLE VOTING POWER
 0
SHARES ______________________________________________________________

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY ______________________________________________________________

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING ______________________________________________________________

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
_____________________________________________________________________________
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
_____________________________________________________________________________
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0%
_____________________________________________________________________________
 (12) TYPE OF REPORTING PERSON
 IN
_____________________________________________________________________________

Schedule 13G/A PAGE 7 OF 14

CUSIP No. 125965103
_____________________________________________________________________________

 (1) NAME OF REPORTING PERSON
 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
 David C. Ott
_____________________________________________________________________________

 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 (a) [ ]
 (b) [x]
_____________________________________________________________________________

 (3) SEC USE ONLY
_____________________________________________________________________________

 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 United States
_____________________________________________________________________________

NUMBER OF (5) SOLE VOTING POWER
 0
SHARES ______________________________________________________________

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY ______________________________________________________________

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING ______________________________________________________________

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
_____________________________________________________________________________
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
_____________________________________________________________________________
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0%
_____________________________________________________________________________
 (12) TYPE OF REPORTING PERSON
 IN
_____________________________________________________________________________

Schedule 13G/A PAGE 8 OF 14

CUSIP No. 125965103
_____________________________________________________________________________
 (1) NAME OF REPORTING PERSON
 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
 Thomas W. Purcell, Jr.
_____________________________________________________________________________

 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 (a) [ ]
 (b) [x]
_____________________________________________________________________________

 (3) SEC USE ONLY
_____________________________________________________________________________

 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 United States
_____________________________________________________________________________

NUMBER OF (5) SOLE VOTING POWER
 0
SHARES ______________________________________________________________

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY ______________________________________________________________

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING ______________________________________________________________

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
_____________________________________________________________________________
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
_____________________________________________________________________________
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0%
_____________________________________________________________________________
 (12) TYPE OF REPORTING PERSON
 IN
_____________________________________________________________________________

Schedule 13G/A PAGE 9 OF 14

CUSIP No. 125965103
_____________________________________________________________________________
 (1) NAME OF REPORTING PERSON
 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
 Daniel J. Cahill
_____________________________________________________________________________

 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 (a) [ ]
 (b) [x]
_____________________________________________________________________________

 (3) SEC USE ONLY
_____________________________________________________________________________

 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
 United States
_____________________________________________________________________________

NUMBER OF (5) SOLE VOTING POWER
 0
SHARES ______________________________________________________________

BENEFICIALLY (6) SHARED VOTING POWER
 0
OWNED BY ______________________________________________________________

EACH (7) SOLE DISPOSITIVE POWER
 0
REPORTING ______________________________________________________________

PERSON WITH (8) SHARED DISPOSITIVE POWER
 0
_____________________________________________________________________________
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED
 BY EACH REPORTING PERSON
 0
_____________________________________________________________________________
 (10) CHECK BOX IF THE AGGREGATE AMOUNT
 IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
 (11) PERCENT OF CLASS REPRESENTED
 BY AMOUNT IN ROW (9)
 0%
_____________________________________________________________________________
 (12) TYPE OF REPORTING PERSON
 IN
_____________________________________________________________________________

Schedule 13G/A PAGE 10 OF 14

ITEM 1(a). NAME OF ISSUER:
CSK Auto Corporation

ITEM 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
645 E. Missouri Avenue, Suite 400, Phoenix, Arizona 85012

ITEM 2(a). NAME OF PERSON FILING:
Viking Global Performance LLC ("VGP"), Viking Global Investors LP ("VGI"), Viking Global Equities LP ("VGE"), Viking Global Equities II LP ("VGEII") O. Andreas Halvorsen, David C. Ott, Thomas W. Purcell, Jr.and Daniel J. Cahill.

ITEM 2(b). ADDRESS OF PRINCIPAL OFFICE OR, IF NONE, RESIDENCE:
The business address of each of the Reporting Persons is 55 Railroad Avenue, Greenwich, CT 06830.

ITEM 2(c). CITIZENSHIP:
VGE, VGEII and VGI are each Delaware limited partnerships and VGP is a Delaware limited liability company. O. Andreas Halvorsen is a citizen of Norway, David C. Ott, Thomas W. Purcell, Jr. and Daniel J. Cahill are all citizens of the United States.

ITEM 2(d). TITLE OF CLASS OF SECURITIES:
Class A Common Stock, par value $.01

ITEM 2(e). CUSIP NUMBER: 125965103

ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO 13d-1(b) OR 13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A:

(a) [ ] Broker or dealer registered under Section 15 of the Act

(b) [ ] Bank as defined in Section 3(a)(6) of the Act

(d) [ ] Investment Company registered under Section 8 of the Investment Company Act of 1940

(e) [ ] Investment Adviser registered under Section 203 of the Investment Advisers Act of 1940: see Rule 13d-
1(b)(1)(ii)(E)

(f) [ ] Employee Benefit Plan, Pension Fund which is subject to the provisions of the Employee Retirement Income Security Act of 1974 or Endowment Fund; see Rule 13d-
1(b)(1)(ii)(F)

Schedule 13G/A PAGE 11 OF 14

 (g) [ ] Parent Holding Company, in accordance with Rule 13d-
 1(b)(ii)(G);

 (h) [ ] Savings Associations as defined in Section 3(b) of the
 Federal Deposit Insurance Act;

 (i) [ ] Church Plan that is excluded from the definition of an
 investment company under Section 3(c)(14) of the
 Investment Company Act of 1940;

(j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

IF THIS STATEMENT IS FILED PURSUANT TO Rule 13d-1(c), CHECK THIS

BOX. [x]

ITEM 4. OWNERSHIP.
A. VGP and VGI
(a) Amount beneficially owned 0
(b) Percent of class: 0% (All percentages herein are based on 44,030,484 shares of Common Stock reported to be outstanding as of December 17, 2007 as reflected in the Company's quarterly report, on Form 10Q filed with the Securities and Exchange Commission by the Company for the quarter ended November 4, 2007)

(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote 0
(ii) shared power to vote or to direct the vote 0
(iii) sole power to dispose or to direct the disposition of 0
(iv) shared power to dispose or to direct the disposition of 0

VGP, as the general partner of VGE and VGEII; and VGI, an affiliate of VGP, that provides managerial services to VGE and VGEII, each have the power to dispose of and vote the shares of Common Stock directly owned by VGE and VGEII. VGP and VGI are parties to an investment management agreement with VGE III Portfolio Ltd. which is a company organized under the laws of the Cayman Islands, pursuant to which VGP has investment authority with respect to securities held in such accounts and VGI performs managerial services in connection with such accounts. VGP and VGI have authority to dispose of and vote securities held in such accounts. Neither VGP nor VGI owns directly any shares of Common Stock.

Schedule 13G/A PAGE 12 OF 14

 By reason of the provisions of Rule 13d-3 of the
 Securities Exchange Act of 1934 as amended (the "Act"), VGP
 and VGI may each be deemed to own beneficially shares
 directly held by VGE, VGEII and VGE III Portfolio Ltd.

B. VGE
(a) Amount beneficially owned: 0
(b) Percent of class: 0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote 0
(ii) shared power to vote or to direct the vote 0
(iii) sole power to dispose or to direct the disposition of 0
(iv) shared power to dispose or to direct the disposition of 0

VGE has the power to dispose of and the power to vote the shares of Common Stock directly owned by it, which power may be exercised by its general partner, VGP and by VGI, an affiliate of VGP, which provides managerial services to VGE.

C. VGE II
(a) Amount beneficially owned: 0
(b) Percent of class: 0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote 0
(ii) shared power to vote or to direct the vote 0
(iii) sole power to dispose or to direct the disposition of 0
(iv) shared power to dispose or to direct the disposition of 0

VGEII has the power to dispose of and the power to vote the shares of Common Stock directly owned by it, which power may be exercised by its general partner, VGP and by VGI, an affiliate of VGP, which provides managerial services to VGEII.

D. O. Andreas Halvorsen, David C. Ott, Thomas W. Purcell, Jr. and Daniel J. Cahill
(a) Amount beneficially owned: 0
(b) Percent of class: 0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote 0
(ii) shared power to vote or to direct the vote 0
(iii) sole power to dispose or to direct the disposition of 0
(iv) shared power to dispose or to direct the disposition of 0

Messrs. Halvorsen, Ott, Purcell and Cahill as Operating Committee Members of VGI and VGP, have shared power to dispose of and shared power to vote the Common Stock beneficially owned by VGI and VGP. Neither Messrs. Halvorsen, Ott, Purcell or Cahill directly own any shares of Common Stock. By reason of the provisions of Rule 13d-3 of the Act, each may be deemed to beneficially own the shares directly owned by VGE , VGEII and VGE III Portfolio Ltd.

Schedule 13G/A PAGE 13 OF 14

ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.
If this statement is being filed to report the fact that as of the date hereof the Reporting Persons has ceased to be the beneficial owner of more than five percent of the class of securities, check the following. [X]

ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.
To the knowledge of the Reporting Persons, no other person has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, a number of such Common Stock which represents more than five percent of the number of outstanding shares of Common Stock.

ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.

Not applicable.

ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.
Not applicable.

ITEM 9. NOTICE OF DISSOLUTION OF GROUP.
Not applicable.

ITEM 10. CERTIFICATION. (if filing pursuant to Rule 13d-1(c))
By signing below each Reporting Person certifies that, to the best of its knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and not held in connection with or as a participant in any transaction having that purpose or effect.

Schedule 13G/A PAGE 14 OF 14

SIGNATURES

After reasonable inquiry and to the best of our knowledge and belief, the undersigned certify that the information set forth in this statement is true, complete and correct.

DATED: February 14, 2008
 /s/ O. Andreas Halvorsen
 O. ANDREAS HALVORSEN, individually, and
 as an Operating Committee Member of
 VIKING GLOBAL PERFORMANCE LLC, on behalf
 of itself and VIKING GLOBAL EQUITIES LP,
 VIKING GLOBAL EQUITIES II LP,
 and as an Operating Committee Member
 Viking Global Partners LLC, on behalf of
 VIKING GLOBAL INVESTORS LP.
 /s/ David C. Ott, individually
 DAVID C. OTT
 /s/ Thomas W. Purcell, Jr., individually
 THOMAS W. PURCELL JR.
 /s/ Daniel J. Cahill, individually
 DANIEL J. CAHILL

2078839.1

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