Filed by: American Century World Mutual Funds, Inc. Pursuant to Rule 425 under the Securities Act of 1933, as amended Subject Company: Mason Street Funds, Inc. Investment Company Act File No. 811-07961 AMERICAN CENTURY INVESTMENTS/MASON STREET FUNDS STRATEGIC ALLIANCE WE ARE PLEASED TO ANNOUNCE THE ACQUISITION OF MASON STREET FUNDS BY AMERICAN CENTURY INVESTMENTS. THE ACQUISITION INVOLVES 10 OF THE EXISTING MASON STREET FUNDS REORGANIZING INTO NEW OR EXISTING AMERICAN CENTURY FUNDS. The reorganization is separated into four types of transactions: Merged Funds, Adopted and Subadvised Funds, Adopted Funds and "Federated Transaction." MERGED FUNDS: Four of the Mason Street Funds will be reorganized into existing American Century funds. These include: Mason Street Index 500 Fund American Century Equity Index Fund Mason Street Large Cap Core Fund American Century Equity Growth Fund Mason Street Asset Allocation Fund American Century Strategic Allocation: Moderate Fund Mason Street Growth Stock Fund American Century Select Fund ADOPTED AND SUBADVISED FUNDS: Four Mason Street Funds will be reorganized into newly created American Century funds. American Century Investment Management, Inc. (ACIM) will act as an investment advisor and Mason Street Advisors will act as investment subadvisor. These funds include: Mason Street Small Cap Growth Fund American Century - Mason Street Small Cap Growth Fund Mason Street Aggressive Growth Fund American Century - Mason Street Mid Cap Growth Fund Mason Street Select Bond Fund American Century - Mason Street Select Bond Fund Mason Street High Yield Bond Fund American Century - Mason Street High-Yield Bond Fund ADOPTED FUNDS: Two Mason Street Funds will be reorganized into newly created American Century funds. ACIM or one of its affiliates will act as the investment advisor after the reorganization. These funds include: Mason Street International Equity Fund American Century International Value Fund Mason Street Municipal Bond Fund American Century Long-Term Tax-Free Fund FEDERATED TRANSACTION: One of the Mason Street Funds will be reorganized into an existing investment portfolio of the Federated Funds. Mason Street Index 400 Fund Federated Mid-Cap Index Fund Federated Mid-Cap Index Fund REGISTRATION STATEMENTS RELATING TO THE NEWLY CREATED AMERICAN CENTURY FUNDS HAVE BEEN FILED WITH THE SECURITIES AND EXCHANGE COMMISSION (THE SEC) BUT HAVE NOT YET BECOME EFFECTIVE. THE FUNDS MAY NOT BE SOLD, NOR MAY OFFERS TO BUY BE ACCEPTED, PRIOR TO THE TIME THE REGISTRATION STATEMENTS BECOME EFFECTIVE. THIS COMMUNICATION SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THE FUNDS IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE. THE INFORMATION INCLUDED HEREIN IS ALSO NOT A SOLICITATION OF ANY PROXY. THE ISSUERS OF THE AMERICAN CENTURY FUNDS LISTED ABOVE (AMERICAN CENTURY MUTUAL FUNDS, INC., AMERICAN CENTURY INVESTMENT TRUST, AMERICAN CENTURY CAPITAL PORTFOLIOS, INC., AMERICAN CENTURY QUANTITATIVE EQUITY FUNDS, INC., AMERICAN CENTURY WORLD MUTUAL FUNDS, INC., AMERICAN CENTURY STRATEGIC ASSET ALLOCATIONS, INC., AND AMERICAN CENTURY MUNICIPAL TRUST) HAVE FILED A PROXY STATEMENT/PROSPECTUS AND OTHER RELEVANT DOCUMENTS REGARDING THE REORGANIZATION WITH THE SEC. INVESTORS ARE URGED TO READ THE PROXY STATEMENT/PROSPECTUS AND OTHER DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE PLANNED EORGANIZATION, OR INCORPORATED BY REFERENCE INTO THE PROXY STATEMENT/PROSPECTUS, BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT THE REORGANIZATION AND RELATED MATTERS. YOU CAN OBTAIN THE PROXY STATEMENT/PROSPECTUS AND OTHER RELATED DOCUMENTS FREE OF CHARGE AT THE SEC WEB SITE (WWW.SEC.GOV). FOR INSTITUTIONAL USE ONLY/NOT FOR PUBLIC USE AMERICAN CENTURY INVESTMENT SERVICES, INC. DISTRIBUTOR TP-FLY-47243 0512
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425 Filing
American Century Emerging Markets Fund - I Class (AMKIX) 425Business combination disclosure
Filed: 23 Dec 05, 12:00am