# EDGAR Filing Document

**Accession Number:** 0000742212
**File Stem:** 0001193125-25-139575
**Filing Date:** 2025-6
**Character Count:** 2821
**Document Hash:** f5ecd6a71766cdfbfd4475eae876d805
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-139575.hdr.sgml**: 20250612

**ACCESSION NUMBER**: 0001193125-25-139575

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250612

**DATE AS OF CHANGE**: 20250612

**EFFECTIVENESS DATE**: 20250612

**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:** 251041714

**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

### Domestic Equity Portfolio (Series ID: S000000041)

| Class ID   | Class Name                | Ticker Symbol   |
|:---|:---|:---|
| C000000076 | Domestic Equity Portfolio |  |

**Northwestern Mutual Series Fund, Inc.**

**Domestic Equity Portfolio**

Supplement Dated June 12, 2025, to the <br>Prospectuses Dated May 1, 2025

The following information supplements the Statutory Prospectus for the Northwestern Mutual Series Fund, Inc. (the "Fund") and the Summary Prospectus for the Domestic Equity Portfolio, each dated May 1, 2025, as may be supplemented (the "Prospectuses"). You should read this Supplement together with the Prospectuses.

***<u>Sub-Adviser Change for the Domestic Equity Portfolio</u>***

On or about July 31, 2025, Putnam Investment Management, LLC ("Putnam") will replace Delaware Investments Fund Advisers as the sub-adviser for the Fund's Domestic Equity Portfolio (the "Portfolio"). Putnam will provide investment sub-advisory services for the Portfolio pursuant to an Investment Sub-Advisory Agreement approved by the Fund's Board of Directors on June 5, 2025.

In approving the new Investment Sub-Advisory Agreement, the Fund relied on an Exemptive Order issued by the Securities and Exchange Commission that permits the Fund and its investment adviser to hire or terminate a sub-adviser at any time without shareholder approval so long as, among other conditions, shareholders are provided notice of the change. Additional information about Putnam, its investment strategies for the Portfolio, associated risks, and other information will be made available in the near future, consistent with the requirements of the Exemptive Order.

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

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