Index 400 Stock 

Fund Overview
Adviser: Mason Street Advisors, LLC
Objective/Focus: Invests substantially 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
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.
Fund Facts as of 09/30/14
Fund Inception 04-30-1999
First Available for Variable Annuity 04-30-1999
First Available for Variable Life 06-30-1999
Net Assets $623.38 Million
Top 10 Portfolio Holdings % of Net Assets
Equinix, Inc. 0.7%
Skyworks Solutions, Inc. 0.7%
Hanesbrands, Inc. 0.7%
Endo International PLC 0.7%
Salix Pharmaceuticals, Inc. 0.6%
Henry Schein, Inc. 0.6%
SL Green Realty Corp. 0.6%
Advance Auto Parts, Inc. 0.6%
Church & Dwight Co., Inc. 0.6%
Signet Jewelers, Ltd. 0.6%
Total % of Net Assets 6.4%
Download Publicly Disclosed Holdings
Sector Weightings % of Equities
Financials 22.3%
Information Technology 17.2%
Industrials 16.1%
Consumer Discretionary 13.7%
Health Care 9.7%

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. MSA is the principal investment adviser for all the Portfolios in the Northwestern Mutual Series Fund (Series Fund). (Portfolios in the Series Funds are identified by the parenthetical next to the portfolio name.) MSA has engaged and oversees subadvisers who provide day-to-day management for certain of the Series Fund Portfolios. Each subadviser 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, Credit Suisse Asset Management, LLC, 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.

"Standard & Poor's®", "S&P®", "S&P SmallCap 600" and "Standard & Poor's SmallCap 600" are trademarks of The McGraw-Hill Companies, Inc. and have been licensed for use by The Northwestern Mutual Life Insurance Company. The Portfolio is not sponsored, endorsed, sold or promoted by Standard & Poor's, and Standard & Poor's makes no representation regarding the advisability of investing in the Portfolio.

NMFN-S05 (1012)