SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933              [X]

     File No. 33-19589

     Pre-Effective Amendment No.                                     [ ]

     Post-Effective Amendment No. 43                                 [X]

                             and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940      [X]

     File No. 811-5447

     Amendment No. 45                                                [X]

                        (Check appropriate box or boxes.)


                AMERICAN CENTURY QUANTITATIVE EQUITY FUNDS, INC.
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               (Exact Name of Registrant as Specified in Charter)


                     4500 MAIN STREET, KANSAS CITY, MO 64111
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               (Address of Principal Executive Offices) (Zip Code)


       Registrant's Telephone Number, including Area Code: (816) 531-5575


   DAVID C. TUCKER, ESQ., 4500 MAIN STREET, 9TH FLOOR, KANSAS CITY, MO 64111
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                     (Name and Address of Agent for Service)

           Approximate Date of Proposed Public Offering: May 1, 2006

It is proposed that this filing will become effective (check appropriate box)

     [ ] immediately upon filing pursuant to paragraph (b)
     [X] on May 1, 2006 pursuant to paragraph (b)
     [ ] 60 days after filing pursuant to paragraph (a)(1)
     [ ] on (date) pursuant to paragraph (a)(1)
     [ ] 75 days after filing pursuant to paragraph (a)(2)
     [ ] on (date) pursuant to paragraph (a)(2) of rule 485.

If appropriate, check the following box:

     [X] This post-effective amendment designates a new effective date for a
         previously filed post-effective amendment.



The sole purpose of this filing  (Post-Effective  Amendment No. 43) is to extend
the date of effectiveness of the  Registrant's  previously filed  Post-Effective
Amendment  No. 42 to May 1, 2006.  Post-Effective  Amendment  No. 42  originally
requested effectiveness as of April 19, 2006.

This  Post-Effective  Amendment No. 43 incorporates by reference the information
contained in Parts A, B and C of Post-Effective Amendment No. 42.




                                   SIGNATURES

     Pursuant  to the  requirements  of the  Securities  Act and the  Investment
Company  Act  of  1940,  the  Registrant  certifies  that  it  meets  all of the
requirements for effectiveness of this Registration Statement amendment pursuant
to Rule 485(b) promulgated under the Securities Act of 1933, as amended, and has
duly caused this amendment to be signed on its behalf by the  undersigned,  duly
authorized,  in the City of Kansas  City,  State of  Missouri on the 18th day of
April, 2006.


                        AMERICAN CENTURY QUANTITATIVE EQUITY FUNDS, INC.
                        (Registrant)


                        By: /*/ William M. Lyons
                            -------------------------------------------
                            William M. Lyons
                            President and Principal Executive Officer


     Pursuant  to  the   requirements  of  the  Securities  Act  of  1933,  this
Registration  Statement amendment has been signed below by the following persons
in the capacities and on the dates indicated.


SIGNATURE                        TITLE                             DATE
---------                        -----                             ----

*William M. Lyons           President, Director and
------------------------    Principal Executive Officer      April 18, 2006
William M. Lyons


*Maryanne Roepke            Senior Vice President,           April 18, 2006
------------------------    Treasurer and
Maryanne Roepke             Chief Financial Officer


*Antonio Canova             Director                         April 18, 2006
------------------------
Antonio Canova


*John Freidenrich           Director                         April 18, 2006
------------------------
John Freidenrich


*Ronald J. Gilson           Chairman of the Board and        April 18, 2006
------------------------    Director
Ronald J. Gilson


*Kathryn A. Hall            Director                         April 18, 2006
------------------------
Kathryn A. Hall


*Myron S. Scholes           Director                         April 18, 2006
------------------------
Myron S. Scholes


*John B. Shoven             Director                         April 18, 2006
------------------------
John B. Shoven


*Jeanne D. Wohlers          Director                         April 18, 2006
------------------------
Jeanne D. Wohlers




*By:  /s/ Ryan L. Blaine
      ------------------------------------------
      Ryan L. Blaine
      Attorney-in-Fact (pursuant to Power of
      Attorney dated December 2, 2005)