Index 600 Stock 

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Fund Overview
Adviser: Mason Street Advisors, LLC
Objective/Focus: The objective is to achieve investment results that approximate the performance of the S&P SmallCap 600® Index’s performance.
Asset Class: Small-Cap Stocks
Style: Blend
Investing in small company stocks involves a greater degree of risk than investing in medium or large company stocks.
Indices are unmanaged, cannot be invested in directly and do not include expenses or sales charges.
Fund Facts as of 03/31/12
Fund Inception 04-30-2007
First Available for Variable Annuity 04-30-2007
First Available for Variable Life 06-30-2011
Net Assets $66.95 Million
Top 10 Portfolio Holdings % of Net Assets
iShares S&P SmallCap 600 Index Fund 4.0%
Kilroy Realty Corp. 0.6%
Salix Pharmaceuticals, Ltd. 0.5%
BioMed Realty Trust, Inc. 0.5%
Mid-America Apartment Communities, Inc. 0.5%
Extra Space Storage, Inc. 0.5%
Cubist Pharmaceuticals, Inc. 0.5%
Tanger Factory Outlet Centers, Inc. 0.5%
ProAssurance Corp. 0.5%
Lufkin Industries, Inc. 0.5%
Total % of Net Assets 8.6%
Download Publicly Disclosed Holdings
Sector Weightings % of Equities
Financials 19.7%
Information Technology 18.1%
Consumer Discretionary 15.0%
Industrials 14.6%
Health Care 10.4%

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.