Index 400 Stock 

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Fund Overview
Adviser: Mason Street Advisors, LLC
Objective/Focus: Invests in most or all of its assets in the stocks in the S&P MidCap 400® Index, which is an unmanaged index of 400 selected common stocks compiled by Standard & Poor’s® and weighted toward medium market capitalizations. The objective is to achieve investment results that approximate the performance of the S&P MidCap 400® Index.
Asset Class: Mid-Cap Stocks
Style: Blend/Market-Oriented
Fund Facts as of 12/31/11
Fund Inception 04-30-1999
First Available for Variable Annuity 04-30-1999
First Available for Variable Life 06-30-1999
Net Assets $439.40 Million
Top 10 Portfolio Holdings % of Net Assets
Kansas City Southern 0.7%
Hansen Natural Corp. 0.6%
Vertex Pharmaceuticals, Inc. 0.6%
AMETEK, Inc. 0.6%
The Macerich Co. 0.6%
Church & Dwight Co., Inc. 0.6%
Green Mountain Coffee Roasters, Inc. 0.5%
Henry Schein, Inc. 0.5%
Federal Realty Investment Trust 0.5%
SL Green Realty Corp. 0.5%
Total % of Net Assets 5.7%
Download Publicly Disclosed Holdings
Sector Weightings % of Equities
Financials 20.6%
Industrials 16.6%
Information Technology 15.4%
Consumer Discretionary 13.0%
Health Care 10.1%

You should carefully consider the investment objectives, risks, expenses and charges of the investment company before you invest. Your Northwestern Mutual Investment Services Registered Representative can provide you with a contract and fund prospectus that will contain the information noted above, and other important information that you should read carefully before you invest or send money.

Mason Street Advisors, LLC (MSA), a wholly owned company of Northwestern Mutual, is a federally registered investment adviser. Mason Street Advisors, LLC (MSA) is the principal investment adviser for all the Portfolios in the Northwestern Mutual Series Fund (Series Fund) (NMSF). (Portfolios in the Series Funds are identified by the parenthetical next to the portfolio name.) MSA has engaged and oversees sub-advisers who provide day-to-day management for certain of the Series Fund Portfolios. Each sub-adviser may be replaced without the approval of shareholders. Please see the prospectus for more information. Additional fund options are advised by Russell Investments, Fidelity Investments® and Neuberger Berman Management, LLC.

All securities are offered through Northwestern Mutual Investment Services LLC, (NMIS), Subsidiary of Northwestern Mutual and member FINRA and SIPC.

NMFN-S05 (0601)