Index 600 Stock Fund

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.
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.
Fund Facts as of 9/30/17
Fund Inception 04-30-2007
First Available for Variable Annuity 04-30-2007
First Available for Variable Life 06-30-2011
Net Assets $209.71 Million
Top 10 Portfolio Holdings % of Net Assets
iShares Core S&P Small-Cap 600 ETF 2.3%
MKS Instruments, Inc. 0.6%
Healthcare Services Group, Inc. 0.5%
ALLETE, Inc. 0.5%
Nektar Therapeutics 0.5%
Spire, Inc. 0.4%
Barnes Group, Inc. 0.4%
CACI International, Inc. - Class A
0.4%
Lumentum Holdings, Inc.
0.4%
Cantel Medical Corp. 0.4%
Total % of Net Assets 6.4%
Download Publicly Disclosed Holdings
Sector Weightings % of Equities
Industrials
18.4%
Financials
15.8%
Information Technology 15.0%
Consumer Discretionary
14.9%
Health Care 12.6%

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.