# EDGAR Filing Document

**Accession Number:** 0000742212
**File Stem:** 0001193125-26-199132
**Filing Date:** 2026-5
**Character Count:** 8184
**Document Hash:** fb75737e2c8a9c0db4282e99a05b651f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-199132.hdr.sgml**: 20260501

**ACCESSION NUMBER**: 0001193125-26-199132

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260501

**DATE AS OF CHANGE**: 20260501

**EFFECTIVENESS DATE**: 20260501

**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:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-89971
- **FILM NUMBER:** 26928941

**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

### Small Cap Growth Stock Portfolio (Series ID: S000000039)

| Class ID   | Class Name                       | Ticker Symbol   |
|:---|:---|:---|
| C000000074 | Small Cap Growth Stock Portfolio |  |

### Large Cap Core Stock Portfolio (Series ID: S000000040)

| Class ID   | Class Name                     | Ticker Symbol   |
|:---|:---|:---|
| C000000075 | Large Cap Core Stock Portfolio |  |

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

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

### Equity Income Portfolio (Series ID: S000000042)

| Class ID   | Class Name              | Ticker Symbol   |
|:---|:---|:---|
| C000000077 | Equity Income Portfolio |  |

### Index 500 Stock Portfolio (Series ID: S000000043)

| Class ID   | Class Name                | Ticker Symbol   |
|:---|:---|:---|
| C000000078 | Index 500 Stock Portfolio |  |

### Active/Passive Moderate Portfolio (Series ID: S000000044)

| Class ID   | Class Name                        | Ticker Symbol   |
|:---|:---|:---|
| C000000079 | Active/Passive Moderate Portfolio |  |

### Active/Passive Balanced Portfolio (Series ID: S000000045)

| Class ID   | Class Name                        | Ticker Symbol   |
|:---|:---|:---|
| C000000080 | Active/Passive Balanced Portfolio |  |

### High Yield Bond Portfolio (Series ID: S000000046)

| Class ID   | Class Name                | Ticker Symbol   |
|:---|:---|:---|
| C000000081 | High Yield Bond Portfolio |  |

### Select Bond Portfolio (Series ID: S000000047)

| Class ID   | Class Name            | Ticker Symbol   |
|:---|:---|:---|
| C000000082 | Select Bond Portfolio |  |

### Government Money Market Portfolio (Series ID: S000000048)

| Class ID   | Class Name                        | Ticker Symbol   |
|:---|:---|:---|
| C000000083 | Government Money Market Portfolio |  |

### Small Cap Value Portfolio (Series ID: S000000049)

| Class ID   | Class Name                | Ticker Symbol   |
|:---|:---|:---|
| C000000084 | Small Cap Value Portfolio |  |

### Mid Cap Growth Stock Portfolio (Series ID: S000000050)

| Class ID   | Class Name                     | Ticker Symbol   |
|:---|:---|:---|
| C000000085 | Mid Cap Growth Stock Portfolio |  |

### International Growth Portfolio (Series ID: S000000051)

| Class ID   | Class Name                     | Ticker Symbol   |
|:---|:---|:---|
| C000000086 | International Growth Portfolio |  |

### International Equity Portfolio (Series ID: S000000052)

| Class ID   | Class Name                     | Ticker Symbol   |
|:---|:---|:---|
| C000000087 | International Equity Portfolio |  |

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

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

### Index 400 Stock Portfolio (Series ID: S000000054)

| Class ID   | Class Name                | Ticker Symbol   |
|:---|:---|:---|
| C000000089 | Index 400 Stock Portfolio |  |

### Focused Appreciation Portfolio (Series ID: S000000055)

| Class ID   | Class Name                     | Ticker Symbol   |
|:---|:---|:---|
| C000000090 | Focused Appreciation Portfolio |  |

### Growth Stock Portfolio (Series ID: S000000056)

| Class ID   | Class Name             | Ticker Symbol   |
|:---|:---|:---|
| C000000091 | Growth Stock Portfolio |  |

### Large Company Value Portfolio (Series ID: S000018227)

| Class ID   | Class Name                    | Ticker Symbol   |
|:---|:---|:---|
| C000050275 | Large Company Value Portfolio |  |

### Inflation Managed Portfolio (Series ID: S000018228)

| Class ID   | Class Name                  | Ticker Symbol   |
|:---|:---|:---|
| C000050276 | Inflation Managed Portfolio |  |

### Large Cap Blend Portfolio (Series ID: S000018229)

| Class ID   | Class Name                | Ticker Symbol   |
|:---|:---|:---|
| C000050277 | Large Cap Blend Portfolio |  |

### Research International Core Portfolio (Series ID: S000018230)

| Class ID   | Class Name                            | Ticker Symbol   |
|:---|:---|:---|
| C000050278 | Research International Core Portfolio |  |

### Index 600 Stock Portfolio (Series ID: S000018231)

| Class ID   | Class Name                | Ticker Symbol   |
|:---|:---|:---|
| C000050279 | Index 600 Stock Portfolio |  |

### Emerging Markets Equity Portfolio (Series ID: S000018232)

| Class ID   | Class Name                        | Ticker Symbol   |
|:---|:---|:---|
| C000050280 | Emerging Markets Equity Portfolio |  |

### Short-Term Bond Portfolio (Series ID: S000018233)

| Class ID   | Class Name                | Ticker Symbol   |
|:---|:---|:---|
| C000050281 | Short-Term Bond Portfolio |  |

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

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

### Multi-Sector Bond Portfolio (Series ID: S000018235)

| Class ID   | Class Name                  | Ticker Symbol   |
|:---|:---|:---|
| C000050283 | Multi-Sector Bond Portfolio |  |

### Active/Passive Conservative Portfolio (Series ID: S000091982)

| Class ID   | Class Name                            | Ticker Symbol   |
|:---|:---|:---|
| C000259888 | Active/Passive Conservative Portfolio |  |

### Active/Passive Aggressive Portfolio (Series ID: S000091983)

| Class ID   | Class Name                          | Ticker Symbol   |
|:---|:---|:---|
| C000259889 | Active/Passive Aggressive Portfolio |  |

### Active/Passive Very Aggressive Portfolio (Series ID: S000091984)

| Class ID   | Class Name                               | Ticker Symbol   |
|:---|:---|:---|
| C000259890 | Active/Passive Very Aggressive Portfolio |  |

**Northwestern Mutual Series Fund, Inc.** <br>**720 East Wisconsin Avenue** <br>**Milwaukee, Wisconsin 53202-4797**

May 1, 2026

<u>VIA EDGAR</u>

U.S. Securities and Exchange Commission <br>100 F Street, N.E. <br>Washington, D.C. 20549

Re:

Northwestern Mutual Series Fund, Inc. (the "Registrant") <br>1933 Act Post-Effective Amendment No. 96 <br>Registration No.'s 2-89971; 811-3990 <br>EDGAR CIK No. 0000742212

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended (the "Securities Act") we certify that the form of Prospectus, dated May 1, 2026, that would have been filed under paragraph (c) of Rule 497 would not have differed from the Prospectus contained in Post-Effective Amendment No. 96 ("Amendment") to the Registrant's Registration Statement on Form N-1A. Such Amendment was filed electronically via EDGAR on April 24, 2026.

Please be advised that, pursuant to Rule 497(c) under the Securities Act, the Registrant filed the exact final form of the Registrant's Statement of Additional Information, dated May 1, 2026, electronically via EDGAR on May 1, 2026.

---

| | |
|:---|:---|
| Regards, | Regards, |
|  | /s/ MICHAEL J. MURPHY |
| Assistant General Counsel | Assistant General Counsel |
| Northwestern Mutual | Northwestern Mutual |

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