Index 400 Stock Fund

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 9/30/17
Fund Inception 04-30-1999
First Available for Variable Annuity 04-30-1999
First Available for Variable Life 06-30-1999
Net Assets $847.4 Million
Top 10 Portfolio Holdings % of Net Assets
Teleflex, Inc. 0.6%
Take-Two Interactive Software, Inc. 0.6%
MSCI, Inc. 0.6%
Huntington Ingalls Industries, Inc. 0.6%
NVR, Inc. 0.6%
Trimble Navigation, Ltd. 0.6%
SVB Financial Group 0.6%
Domino's Pizza, Inc. 0.6%
Cognex Corp. 0.6%
Broadridge Financial Solutions, Inc. 0.6%
Total % of Net Assets 6.0%
Download Publicly Disclosed Holdings
Sector Weightings % of Equities
Information Technology
17.3%
Financials
17.1%
Industrials 15.6%
Consumer Discretionary
11.7%
Real Estate 9.6%

Before investing in a variable product, you should carefully consider the objectives, risks and charges associated with its investment options. For this and other information about a Contract, you should obtain the appropriate Contract and underlying fund prospectuses by contacting your Northwestern Mutual Financial Representative. Read the prospectuses carefully before you invest.

Mason Street Advisors, LLC (MSA) is the principal investment adviser for all the Portfolios in the Northwestern Mutual Series Fund (Series Fund). (Portfolios in the Series Fund 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, Neuberger Berman Investment Advisers LLC and Credit Suisse Asset Management, LLC

All securities are offered through Northwestern Mutual Investment Services LLC, (NMIS), Suite 600, 611 E. Wisconsin Avenue, Milwaukee, WI 53202, 1-866-664-7737. Member FINRA and SIPC. NMIS is a subsidiary of Northwestern Mutual.