# Active/Passive Conservative Portfolio — new fund registration

NORTHWESTERN MUTUAL SERIES FUND INC registered 3 new fund series on Form 485APOS, filed 2025-02-13. Featured series: Active/Passive Conservative Portfolio.

## Registration

- Registrant / trust: NORTHWESTERN MUTUAL SERIES FUND INC
- CIK: 0000742212
- Form: 485APOS
- Filed: 2025-02-13
- State of incorporation: MD
- Accession: 0001193125-25-025851
- Reported net assets: $31.9M

## Series & classes (3)

| Series | Class | Ticker | New |
| --- | --- | --- | --- |
| [Active/Passive Conservative Portfolio](https://search.stillhousedata.com/fund/S000091982) | Active/Passive Conservative Portfolio | — | Yes |
| [Active/Passive Aggressive Portfolio](https://search.stillhousedata.com/fund/S000091983) | Active/Passive Aggressive Portfolio | — | Yes |
| [Active/Passive All Equity Portfolio](https://search.stillhousedata.com/fund/S000091984) | Active/Passive All Equity Portfolio | — | Yes |

## Fees (from the effective prospectus)

- 12b-1 fee: 0.00%
- Gross expense ratio: 0.81%
- Management fee: 0.15%
- Net expense ratio: 0.54%
- Other expenses: 0.39%

## Investment objective

The investment objective of the Portfolio is to realize as high a level of total return as is consistent with conservative investment risk through income and secondarily through capital appreciation.

## Advisers

- [Mason Street Advisors, LLC (Advisor)](https://search.stillhousedata.com/firm/114085)

## Other filings by this registrant (15)

- [485APOS — 2026-02-19](https://search.stillhousedata.com/launch/0001193125-26-058781)
- [485APOS — 2025-02-21](https://search.stillhousedata.com/launch/0001193125-25-031752)
- [485APOS — 2024-02-14](https://search.stillhousedata.com/launch/0001193125-24-036555)
- [485APOS — 2023-02-14](https://search.stillhousedata.com/launch/0001193125-23-038111)
- [485APOS — 2022-02-16](https://search.stillhousedata.com/launch/0001193125-22-044225)
- [485APOS — 2021-02-16](https://search.stillhousedata.com/launch/0001193125-21-044722)
- [485APOS — 2020-02-14](https://search.stillhousedata.com/launch/0001193125-20-038099)
- [485APOS — 2018-02-22](https://search.stillhousedata.com/launch/0001193125-18-053480)
- [485APOS — 2017-02-23](https://search.stillhousedata.com/launch/0001193125-17-053636)
- [485APOS — 2016-02-19](https://search.stillhousedata.com/launch/0001193125-16-469981)
- [485APOS — 2015-02-20](https://search.stillhousedata.com/launch/0001193125-15-056321)
- [485APOS — 2014-02-21](https://search.stillhousedata.com/launch/0001193125-14-062793)

## More

- [Registrant profile: NORTHWESTERN MUTUAL SERIES FUND INC](https://search.stillhousedata.com/registrant/742212)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/launch/0001193125-25-025851.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.