SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549

                                 SCHEDULE 13G/A
                                 (Rule 13d-102)
                                (Amendment No. 4)
           INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO
            RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
                            PURSUANT TO RULE 13d-2(b)





                                  CARMAX, INC.
--------------------------------------------------------------------------------
                                (Name of Issuer)


                          Common Stock, $0.50 par value
--------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    143130102
--------------------------------------------------------------------------------
                                 (CUSIP Number)


                                December 31, 2006
--------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

           [X]   Rule 13d-1(b)
           [ ]   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
disclosures provided in a prior cover page.

The information required on 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).


                                    1 of 10



---------------------                                   ------------------------
                     |                                 |
CUSIP No. 143130102  |                13G/A            |
                     |                                 |
---------------------                                   ------------------------

--------------------------------------------------------------------------------

      1        NAME OF REPORTING PERSONS
               I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

               Maverick Capital, Ltd. - 75-2482446
--------------------------------------------------------------------------------

      2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                   (a)  |_|
                                                                   (b)  |_|
--------------------------------------------------------------------------------

      3        SEC USE ONLY

--------------------------------------------------------------------------------

      4        CITIZENSHIP OR PLACE OF ORGANIZATION

               Texas

--------------------------------------------------------------------------------

    NUMBER OF                   5   SOLE VOTING POWER
    SHARES
  BENEFICIALLY                       0
   OWNED BY                     ------------------------------------------------
     EACHR
   EPORTING                     6   SHARED VOTING POWER
  PERSON WITH
                                    0
                                ------------------------------------------------
                                7   SOLE DISPOSITIVE POWER

                                    0
                                ------------------------------------------------

                                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*

               IA
--------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT

                                    2 of 10



---------------------                                   ------------------------
                     |                                 |
CUSIP No. 143130102  |                13G/A            |
                     |                                 |
---------------------                                   ------------------------

--------------------------------------------------------------------------------

      1        NAME OF REPORTING PERSONS
               I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

               Maverick Capital Management, LLC - 75-2686461
--------------------------------------------------------------------------------

      2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                   (a)  |_|
                                                                   (b)  |_|
--------------------------------------------------------------------------------

      3        SEC USE ONLY

--------------------------------------------------------------------------------

      4        CITIZENSHIP OR PLACE OF ORGANIZATION

               Texas

--------------------------------------------------------------------------------

    NUMBER OF                   5   SOLE VOTING POWER
    SHARES
  BENEFICIALLY                       0
   OWNED BY                     ------------------------------------------------
     EACHR
   EPORTING                     6   SHARED VOTING POWER
  PERSON WITH
                                    0
                                ------------------------------------------------
                                7   SOLE DISPOSITIVE POWER

                                    0
                                ------------------------------------------------

                                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*

               HC
--------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT



                                    3 of 10


---------------------                                   ------------------------
                     |                                 |
CUSIP No. 143130102  |                13G/A            |
                     |                                 |
---------------------                                   ------------------------

--------------------------------------------------------------------------------

      1        NAME OF REPORTING PERSONS
               I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

               Lee S. Ainslie III
--------------------------------------------------------------------------------

      2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                  (a)  |_|
                                                                  (b)  |_|
--------------------------------------------------------------------------------

      3        SEC USE ONLY

--------------------------------------------------------------------------------

      4        CITIZENSHIP OR PLACE OF ORGANIZATION

               United States
--------------------------------------------------------------------------------

        NUMBER OF               5        SOLE VOTING POWER
         SHARES
      BENEFICIALLY
        OWNED BY                         0
          EACH                  ------------------------------------------------
       REPORTING
      PERSON WITH               6        SHARED VOTING POWER


                                         0
--------------------------------------------------------------------------------

                                7        SOLE DISPOSITIVE POWER

                                         0
--------------------------------------------------------------------------------

                                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*

               HC
--------------------------------------------------------------------------------

         *SEE INSTRUCTIONS BEFORE FILLING OUT


                                    4 of 10


Item 1(a)   Name of Issuer.

            Carmax, Inc.

Item 1(b)   Address of Issuer's Principal Executive Offices.

            12800 Tuckahoe Creek Parkway
            Richmond, Virginia 23238

Item 2(a)   Name of Person Filing.

            This Amendment to Schedule 13G (the  "Schedule  13G") is being filed
            on behalf  of each of the  following  persons  (each,  a  "Reporting
            Person"):

            (i)      Maverick Capital, Ltd.;
            (ii)     Maverick Capital Management, LLC; and
            (iii)    Lee S. Ainslie III ("Mr. Ainslie").

            The Schedule 13G relates to Shares (as defined  herein) held for the
            accounts of Maverick Capital, Ltd.'s clients.


Item 2(b)   Address of Principal Business Office, or, if none, Residence.

            The  address  of the  principal  business  office  of  (i)  Maverick
            Capital,  Ltd. and Maverick Capital Management,  LLC is 300 Crescent
            Court, 18th Floor,  Dallas, Texas 75201, and (ii) Mr. Ainslie is 767
            Fifth Avenue, 11th Floor, New York, New York 10153.

Item 2(c)   Citizenship or Place of Organization.

            (i)    Maverick Capital, Ltd. is a Texas limited partnership;
            (ii)   Maverick Capital Management, LLC is a Texas limited liability
                   company; and
            (iii)  Mr. Ainslie is a citizen of the United States.

Item 2(d)   Title of Class of Securities.

            Common Stock, $0.50 par value (the "Shares").

Item 2(e)   CUSIP Number.

            143130102

                                    5 of 10


Item 3.        If this  statement  is filed  pursuant to  ss.ss.240.13d-1(b)  or
               240.13d-2(b) or (c), check whether the person filing is a:

     (a)  [ ]  Broker  or  dealer  registered  under  section  15 of the Act (15
               U.S.C. 78o).

     (b)  [ ]  Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

     (c)  [ ]  Insurance  company as defined in section  3(a)(19) of the Act (15
               U.S.C. 78c).

     (d)  [ ]  Investment  company  registered under section 8 of the Investment
               Company Act of 1940 (15 U.S.C. 80a-8).

     (e)  [X]  An      investment      advisor      in      accordance      with
               ss.240.13d-1(b)(1)(ii)(E).

     (f)  [ ]  An employee  benefit plan or endowment  fund in  accordance  with
               ss.240.13d-1(b)(1)(ii)(F).

     (g)  [X]  A parent  holding  company or control  person in accordance  with
               ss.240.13d-1(b)(1)(ii)(G).

     (h)  [ ]  A savings  association  as defined in Section 3(b) of the Federal
               Deposit Insurance Act (12 U.S.C. 1813).

     (i)  [ ]  A  church  plan  that  is  excluded  from  the  definition  of an
               investment  company  under  Section  3(c)(14)  of the  Investment
               Company Act of 1940 (15 U.S.C. 80a-3).

     (j)  [ ]  Group, in accordance with ss.240.13d-1(b)(1)(ii)(J).

Item 4         Ownership.

               Ownership as of December 31, 2006 is incorporated by reference to
               items  (5) - (9) and  (11)  of the  cover  page of the  Reporting
               Person.

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  person  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.

               Not applicable.

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.


                                   6 of 10



Item 9      Notice of Dissolution of Group.

            Not applicable.

Item 10     Certification.

            By signing below each of the Reporting  Persons  certifies  that, to
            the best of such  person's  knowledge,  and belief,  the  securities
            referred to above were acquired and are held in the ordinary  course
            of business  and 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 are not held in
            connection with or as a participant in any  transaction  having that
            purpose or effect.


                                   SIGNATURES

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

Date:  February 14, 2007          MAVERICK CAPITAL, LTD.

                                  By:  Maverick Capital Management, LLC,
                                       Its General Partner

                                       By:  Lee S. Ainslie III, Manager

                                            By: /s/John T. McCafferty
                                                --------------------------------
                                                John T. McCafferty
                                                Under Power of Attorney dated
                                                February 13, 2003

Date:  February 14, 2007          MAVERICK CAPITAL MANAGEMENT, LLC

                                  By:   Lee S. Ainslie III, Manager

                                        By: /s/John T. McCafferty
                                            ------------------------------------
                                            John T. McCafferty
                                            Under Power of Attorney dated
                                            February 13, 2003


                                    7 of 10



Date:  February 14, 2007                 LEE S. AINSLIE III


                                         By: /s/John T. McCafferty
                                             -----------------------------------
                                             John T. McCafferty
                                             Under Power of Attorney dated
                                             February 13, 2003


                                    8 of 10



                                  EXHIBIT INDEX

A.     Joint Filing  Agreement,  dated  February 13, 2003, by and among Maverick
       Capital, Ltd., Maverick Capital Management, LLC, and Lee S. Ainslie III.



                                                                       Exhibit A

                             Joint Filing Agreement

       The  undersigned  hereby  agree that the  statement  on Schedule 13G with
respect  to the  Common  Stock,  $0.50 par value of  Carmax,  Inc.,  dated as of
February 13, 2003,  is, and any  amendments  thereto  (including  amendments  on
Schedule  13D) signed by each of the  undersigned  shall be,  filed on behalf of
each of us pursuant to and in  accordance  with the  provisions of Rule 13d-1(k)
under the Securities Exchange Act of 1934.

Date:    February 13, 2003


                            MAVERICK CAPITAL, LTD.

                            By:   Maverick Capital Management, LLC
                                  Its General Partner

                                  By:  Lee S. Ainslie III, Manager


                                       By:   /s/John T. McCafferty
                                             -----------------------------------
                                             John T. McCafferty
                                             Under Power of Attorney dated
                                             February 13, 2003


                                      MAVERICK CAPITAL MANAGEMENT, LLC

                                      By:   Lee S. Ainslie III, Manager

                                            By:  /s/John T. McCafferty
                                                 -------------------------------
                                                 John T. McCafferty
                                                 Under Power of Attorney dated
                                                 February 13, 2003


                                      LEE S. AINSLIE III

                                      By:   /s/John T. McCafferty
                                            ------------------------------------
                                            John T. McCafferty
                                            Under Power of Attorney dated
                                            February 13, 2003