# Multi-Sector Bond Portfolio

Multi-Sector Bond Portfolio is a registered fund series of NORTHWESTERN MUTUAL SERIES FUND INC (series S000018235). Net assets $1.4B as of 2026-03-31.

## Profile

- Series ID: S000018235
- Registrant: NORTHWESTERN MUTUAL SERIES FUND INC
- LEI: P0C14V6IL3O47L1ZG636
- Net assets: $1.4B
- Total assets: $1.9B
- As of: 2026-03-31

## Advisers

- [Pacific Investment Management Company LLC (Subadvisor)](https://search.stillhousedata.com/firm/104559)
- [Mason Street Advisors, LLC (Advisor)](https://search.stillhousedata.com/firm/114085)

## Top holdings (200 reported)

_Showing 15 of 200 holdings by value._

| Holding | Ticker | Value | % of fund |
| --- | --- | --- | --- |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F062663) | — | $80.3M | 590.46% |
| Deutsche Bank Securities, Inc. | — | $72.9M | 536.06% |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F060659) | — | $29.0M | 213.37% |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F050643) | — | $20.4M | 150.10% |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F042665) | — | $19.7M | 144.51% |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F050650) | — | $19.0M | 139.79% |
| [United States Treasury](https://search.stillhousedata.com/security/912810TM0) | — | $17.9M | 131.75% |
| Cashmere Valley Bank | — | $17.4M | 127.85% |
| EUROPEAN UNION | — | $14.8M | 108.88% |
| [United States Treasury](https://search.stillhousedata.com/security/912810UB2) | — | $14.6M | 107.68% |
| [Argentina Republic Government International Bonds](https://search.stillhousedata.com/security/040114HV5) | — | $10.8M | 79.66% |
| [SAUDI INTERNATIONAL BOND](https://search.stillhousedata.com/security/80413TBG3) | — | $9.9M | 73.15% |
| [BMO Mortgage Trust](https://search.stillhousedata.com/security/05593RAC6) | — | $8.6M | 63.01% |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F040651) | — | $8.4M | 61.70% |
| Citigroup Global Markets, Inc. | — | $7.8M | 57.36% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-03-31 | $1.4B |
| 2025-12-31 | $1.4B |
| 2025-09-30 | $1.4B |
| 2025-06-30 | $1.3B |
| 2025-03-31 | $1.3B |
| 2024-12-31 | $1.3B |
| 2024-09-30 | $1.3B |
| 2024-06-30 | $1.3B |

## More

- [Registrant: NORTHWESTERN MUTUAL SERIES FUND INC](https://search.stillhousedata.com/registrant/742212)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000018235.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.