# Select Bond Portfolio

Select Bond Portfolio is a registered fund series of NORTHWESTERN MUTUAL SERIES FUND INC (series S000000047). Net assets $2.8B as of 2026-03-31.

## Profile

- Series ID: S000000047
- Registrant: NORTHWESTERN MUTUAL SERIES FUND INC
- LEI: 03DZ35VFRGD62UKLL347
- Net assets: $2.8B
- Total assets: $3.2B
- As of: 2026-03-31

## Advisers

- [Allspring Global Investments, LLC (Subadvisor)](https://search.stillhousedata.com/firm/104973)
- [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 |
| --- | --- | --- | --- |
| [United States Treasury](https://search.stillhousedata.com/security/91282CQB0) | — | $68.5M | 241.39% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CGS4) | — | $51.8M | 182.53% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CQH7) | — | $47.5M | 167.40% |
| [United States Treasury](https://search.stillhousedata.com/security/912810TC2) | — | $43.6M | 153.76% |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F050643) | — | $42.2M | 148.77% |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F052649) | — | $40.6M | 143.06% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CMZ1) | — | $39.7M | 139.95% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CHJ3) | — | $38.2M | 134.70% |
| [United States Treasury](https://search.stillhousedata.com/security/912810UP1) | — | $36.6M | 129.17% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CPR6) | — | $31.2M | 110.05% |
| [United States Treasury](https://search.stillhousedata.com/security/912810TA6) | — | $30.8M | 108.73% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CQG9) | — | $26.9M | 94.70% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CHR5) | — | $25.3M | 89.05% |
| [United States Treasury](https://search.stillhousedata.com/security/912810SF6) | — | $24.7M | 87.13% |
| [Freddie Mac](https://search.stillhousedata.com/security/3133KNJJ3) | — | $23.9M | 84.42% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-03-31 | $2.8B |
| 2025-12-31 | $2.9B |
| 2025-09-30 | $2.9B |
| 2025-06-30 | $2.8B |
| 2025-03-31 | $2.8B |
| 2024-12-31 | $2.8B |
| 2024-09-30 | $2.9B |
| 2024-06-30 | $2.8B |

## 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/S000000047.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.