MID CAP GROWTH STOCK FUND

Fund Overview

Adviser:

Mason Street Advisors, LLC

Subadviser:

Wellington Management Company LLP

Objective/Focus:

Invests in stocks of mid-sized companies selected for their above-average growth potential. The objective is long-term capital growth.

Asset Class:

Mid-Cap Stocks

Style:

Growth

Investing in small company stocks involves a greater degree of risk than investing in medium or large company stocks.

Investing in medium company stocks involves a greater degree of risk than investing in large company stocks.

Fund Facts as of 12/31/18

Fund Inception

12-12-1990

First Available for Variable Annuity

12-03-1990

First Available for Variable Life

05-03-1994

Net Assets

$943.4 Million

Top 10 Portfolio Holdings % of Net Assets

Genpact, Ltd.

2.4%

WEX, Inc.

2.1%

Lennox International, Inc.

2.1%

VeriSign, Inc.

2.0%

Markel Corp.

2.0%

CDW Corp.

1.7%

IDEX Corp.

1.7%

TransUnion

1.6%

Teradata Corp.

1.6%

Ball Corp.

1.6%

Total % of Net Assets

18.8%

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Disclosed Holdings

Sector Weightings % of Equities

Information Technology

27.5%

Health Care

19.2%

Industrials

19.0%

Financials

14.5%

Consumer Discretionary

7.0%

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), 720 E. Wisconsin Avenue, Milwaukee, WI 53202, 1-866-664-7737. Member FINRA and SIPC. NMIS is a subsidiary of Northwestern Mutual.