# EDGAR Filing Document

**Accession Number:** 0000742212
**File Stem:** 0001193125-25-154079
**Filing Date:** 2025-7
**Character Count:** 2103
**Document Hash:** 66710783bb4d2d69035db30587e20d1d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-154079.hdr.sgml**: 20250701

**ACCESSION NUMBER**: 0001193125-25-154079

**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:** 251097082

**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

### Mid Cap Value Portfolio (Series ID: S000000053)

| Class ID   | Class Name              | Ticker Symbol   |
|:---|:---|:---|
| C000000088 | Mid Cap Value Portfolio |  |

**Northwestern Mutual Series Fund, Inc.** <br>**Mid Cap Value Portfolio**

Supplement Dated July 1, 2025 to the <br>Summary Prospectus for the Mid Cap Value Portfolio Dated May 1, 2025

The following information supplements the Summary Prospectus for the Mid Cap Value 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 – Mid Cap Value Portfolio</u>***

Michael Liss, CFA, CPA, Vice President and Senior Portfolio Manager of American Century Investment Management, Inc., 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.

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

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