-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, CL5dKqxUAGyzJeidCUWS5dDhABsqWEA7LYM/Uuq5nFWgboSjaUiyl9O4U/cwEVej /CDRe61nq6omJqpKraV6Lw== 0000100334-09-000009.txt : 20090223 0000100334-09-000009.hdr.sgml : 20090223 20090223121607 ACCESSION NUMBER: 0000100334-09-000009 CONFORMED SUBMISSION TYPE: 425 PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20090223 DATE AS OF CHANGE: 20090223 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: AMERICAN CENTURY WORLD MUTUAL FUNDS INC CENTRAL INDEX KEY: 0000872825 IRS NUMBER: 431567889 STATE OF INCORPORATION: MD FISCAL YEAR END: 1130 FILING VALUES: FORM TYPE: 425 SEC ACT: 1934 Act SEC FILE NUMBER: 811-06247 FILM NUMBER: 09627106 BUSINESS ADDRESS: STREET 1: 4500 MAIN STREET CITY: KANSAS CITY STATE: MO ZIP: 64111 BUSINESS PHONE: 816-531-5575 MAIL ADDRESS: STREET 1: 4500 MAIN STREET CITY: KANSAS CITY STATE: MO ZIP: 64111 FORMER COMPANY: FORMER CONFORMED NAME: TWENTIETH CENTURY WORLD INVESTORS INC DATE OF NAME CHANGE: 19920703 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: AMERICAN CENTURY MUTUAL FUNDS, INC. CENTRAL INDEX KEY: 0000100334 STANDARD INDUSTRIAL CLASSIFICATION: UNKNOWN SIC - 0000 [0000] IRS NUMBER: 446006315 STATE OF INCORPORATION: MO FISCAL YEAR END: 1031 FILING VALUES: FORM TYPE: 425 BUSINESS ADDRESS: STREET 1: 4500 MAIN STREET CITY: KANSAS CITY STATE: MO ZIP: 64111 BUSINESS PHONE: 816-531-5575 MAIL ADDRESS: STREET 1: 4500 MAIN STREET CITY: KANSAS CITY STATE: MO ZIP: 64111 FORMER COMPANY: FORMER CONFORMED NAME: AMERICAN CENTURY MUTUAL FUNDS INC DATE OF NAME CHANGE: 19970107 FORMER COMPANY: FORMER CONFORMED NAME: TWENTIETH CENTURY INVESTORS INC DATE OF NAME CHANGE: 19920703 CENTRAL INDEX KEY: 0000100334 S000006205 GROWTH FUND C000017101 INVESTOR CLASS TWCGX CENTRAL INDEX KEY: 0000872825 S000006608 LIFE SCIENCES FUND C000018045 INVESTOR CLASS ALSIX S000006609 TECHNOLOGY FUND C000018049 INVESTOR CLASS ATCIX CENTRAL INDEX KEY: 0000100334 S000006205 GROWTH FUND C000017103 INSTITUTIONAL CLASS TWGIX CENTRAL INDEX KEY: 0000872825 S000006608 LIFE SCIENCES FUND C000018047 INSTITUTIONAL CLASS AILSX S000006609 TECHNOLOGY FUND C000018051 INSTITUTIONAL CLASS ATYIX 425 1 feb232009-425.htm 425 425 
                                   Filed by: American Century Mutual Funds, Inc.
                                                  Pursuant to Rule 425 under the
                                              Securities Act of 1933, as amended

                      Subject Company: American Century World Mutual Funds, Inc.
                                               SEC Registration No.:  333-157039


                                                                      [ACI LOGO]


American Century World Mutual Funds, Inc.

PROSPECTUS SUPPLEMENT

LIFE SCIENCES FUND * TECHNOLOGY FUND

Supplement dated February 23, 2009 * Prospectuses dated April 1, 2008


The Board of Directors  has  approved  agreements  and plans of  reorganization,
whereby the assets of each of Life Sciences and  Technology  will be transferred
to the American Century Growth Fund in exchange for shares of that fund.

Each  reorganization  is subject to the approval of  shareholders of the fund. A
special  meeting of shareholders of Life Sciences and Technology will be held on
May 5, 2009.  Shareholders as of the close of business on February 20, 2009, are
entitled  to  vote at the  meeting.  Detailed  information  about  the  proposed
reorganizations  will be provided in the proxy materials,  which are expected to
be mailed to shareholders in early March.

If approved by shareholders, the reorganizations will be effective May 29, 2009,
or such other date as American Century may decide.













THE INFORMATION  INCLUDED  HEREIN IS NOT A SOLICITATION  OF ANY PROXY.  AMERICAN
CENTURY MUTUAL FUNDS,  INC. HAS FILED A PRELIMINARY  PROXY  STATEMENT/PROSPECTUS
AND  OTHER  RELEVANT  DOCUMENTS  REGARDING  THE  REORGANIZATIONS  WITH  THE U.S.
SECURITIES  AND EXCHANGE  COMMISSION  (THE "SEC").  INVESTORS  ARE URGED TO READ
THESE DOCUMENTS BECAUSE THEY CONTAIN IMPORTANT INFORMATION. YOU CAN OBTAIN THESE
DOCUMENTS  FREE OF CHARGE AT THE SEC WEB SITE  (WWW.SEC.GOV).  IN ADDITION,  THE
PROXY   STATEMENT/PROSPECTUS  WILL  BE  AVAILABLE  FREE  OF  CHARGE  BY  CALLING
1-866-615-7264 AFTER MARCH 5, 2009.


American Century Investment Services, Inc., Distributor
©2009 American Century Proprietary Holdings, Inc. All rights reserved.

CL-SPL-64892  0902
-----END PRIVACY-ENHANCED MESSAGE-----