BALANCED FUND

Fund Overview

Adviser:

Mason Street Advisors, LLC

Objective/Focus:

The Portfolio seeks to capitalize on changing financial markets and economic conditions following a flexible policy for allocating assets according to a benchmark of 35-55% equities, 40-60% fixed income or debt and 0-20% money market instruments. The objective is to realize as high a level of total return rate as is consistent with prudent investment risk, through income and capital appreciation.

Asset Class:

Balanced

Style:

Hybrid-Market-Oriented for stocks, High/Medium/Low Credit Quality, Moderate Interest Rate Sensitivity for bonds, and High Quality, Short Maturity for money market.

No investment strategy can guarantee a profit or protect against a loss.

The Portfolio may gain exposure to foreign investments by investing in one or more of the Series Fund’s foreign portfolios. Each of those underlying portfolios has its own investment risks, including that it will not perform as expected. In addition, the Portfolio will bear a pro rata share of the underlying portfolios’ expenses.

Fund Facts as of 12/31/18

Fund Inception

12-31-1981

First Available for Variable Annuity

12-31-1981

First Available for Variable Life

07-01-1984

Net Assets

$2.1 Billion

Top 10 Portfolio Holdings % of Net Assets

Northwestern Mutual Series Fund, Inc.,

Select Bond Portfolio

39.7%

Northwestern Mutual Series Fund, Inc.,

High Yield Bond Portfolio

6.3%

Northwestern Mutual Series Fund, Inc.,

Growth Stock Portfolio

6.1%

Northwestern Mutual Series Fund, Inc.,

Research International Core Portfolio

5.0%

Northwestern Mutual Series Fund, Inc.,

Mid Cap Growth Stock Portfolio

4.3%

Northwestern Mutual Series Fund, Inc.,

Mid Cap Value Portfolio

4.1%

Northwestern Mutual Series Fund, Inc.,

Domestic Equity Portfolio

3.3%

Northwestern Mutual Series Fund, Inc.,

Large Cap Blend Portfolio

3.2%

Northwestern Mutual Series Fund, Inc.,

Focused Appreciation Portfolio

3.2%

Northwestern Mutual Series Fund, Inc.,

Equity Income Portfolio

3.1%

Total % of Net Assets

78.3%

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Disclosed Holdings

Sector Weightings % of Equities

Fixed Income

46.0%

Domestic Equity

37.9%

Foreign Equity

10.0%

Short-Term Investments & Other Net Assets

6.1%

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.