# EDGAR Filing Document

**Accession Number:** 0000742212
**File Stem:** 0001193125-25-154076
**Filing Date:** 2025-7
**Character Count:** 2982
**Document Hash:** 7ea08977f8130e83ef522a715efdcbc6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-154076.hdr.sgml**: 20250701

**ACCESSION NUMBER**: 0001193125-25-154076

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250701

**DATE AS OF CHANGE**: 20250701

**EFFECTIVENESS DATE**: 20250701

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NORTHWESTERN MUTUAL SERIES FUND INC
- **CENTRAL INDEX KEY:** 0000742212

**ORGANIZATION NAME:**
- **EIN:** 391603401
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-89971
- **FILM NUMBER:** 251097079

**BUSINESS ADDRESS:**
- **STREET 1:** 720 E WISCONSIN AVE
- **CITY:** MILWAUKEE
- **STATE:** WI
- **ZIP:** 53202
- **BUSINESS PHONE:** 4142992508

**MAIL ADDRESS:**
- **STREET 1:** 720 EAST WISCONSIN AVE
- **CITY:** MILWAUKEE
- **STATE:** WI
- **ZIP:** 53202

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** NORTHWESTERN MUTUAL VARIABLE LIFE SERIES FUND INC
- **DATE OF NAME CHANGE:** 19940830

## Series and Classes Contracts Data

### Long-Term US Government Bond Portfolio (Series ID: S000018234)

| Class ID   | Class Name                             | Ticker Symbol   |
|:---|:---|:---|
| C000050282 | Long-Term US Government Bond Portfolio |  |

**Northwestern Mutual Series Fund, Inc.** <br>**Long-Term U.S. Government Bond Portfolio**

Supplement Dated July 1, 2025 to the <br>Summary Prospectus for the Long-Term U.S. Government Bond Portfolio Dated May 1, 2025

The following information supplements the Summary Prospectus for the Long-Term U.S. Government Bond Portfolio of Northwestern Mutual Series Fund, Inc. (the "Fund") dated May 1, 2025 (the "Summary Prospectus"). You should read this Supplement together with the Summary Prospectus.

***<u>Portfolio Managers Update – Long-Term U.S. Government Bond Portfolio</u>***

Stephen Rodosky, Managing Director of Pacific Investment Management Company LLC, has announced his plans to retire. As a result, he will no longer serve as a portfolio manager for the Portfolio, effective December 31, 2025.

Additionally, effective June 30, 2025, Tim Crowley joined Stephen Rodosky and Michael Cudzil as a co-portfolio manager for the Long-Term U.S. Government Bond Portfolio. Accordingly, the "Portfolio Managers" information set forth under the "Summary – PORTFOLIO MANAGEMENT" section is hereby deleted and replaced with the following:

"**Portfolio Managers**: *Stephen Rodosky*, joined PIMCO in 2001 and is a Managing Director in PIMCO's Newport Beach office. He has managed the Portfolio since 2007.

*Michael Cudzil*, joined PIMCO in 2012 and is a Managing Director in PIMCO's Newport beach office. He has managed the Portfolio since February 2016.

*Tim Crowley*, joined PIMCO in 2008 and is an Executive Vice President in PIMCO's Newport Beach Office. He has managed the Portfolio since June 2025."

**Please retain this Supplement for future reference.**

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