# Core Bond Portfolio

Core Bond Portfolio is a registered fund series of Core Bond Portfolio (series S000005237). Net assets $751.5M as of 2026-03-31.

## Profile

- Series ID: S000005237
- Registrant: Core Bond Portfolio
- LEI: 3BIRQP3EJTB29FBSFZ15
- Net assets: $751.5M
- Total assets: $858.2M
- As of: 2026-03-31

## Advisers

- [Boston Management and Research (Advisor)](https://search.stillhousedata.com/firm/104853)

## Top holdings (200 reported)

_Showing 15 of 200 holdings by value._

| Holding | Ticker | Value | % of fund |
| --- | --- | --- | --- |
| [Morgan Stanley & Co. LLC](https://search.stillhousedata.com/security/61747C707) | — | $82.1M | 1093.09% |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F050643) | — | $79.7M | 1060.79% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CMA6) | — | $19.9M | 264.19% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CEC1) | — | $19.7M | 262.04% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CEN7) | — | $17.8M | 236.95% |
| [United States Treasury](https://search.stillhousedata.com/security/912810TW8) | — | $16.9M | 224.48% |
| [Eaton Vance Short Duration Income ETF](https://search.stillhousedata.com/security/61774R825) | — | $14.5M | 193.18% |
| [Freddie Mac](https://search.stillhousedata.com/security/3132DWNJ8) | — | $11.8M | 156.69% |
| NYKREDIT REALKREDIT A/S | — | $11.0M | 145.83% |
| [Fannie Mae](https://search.stillhousedata.com/security/31418FED5) | — | $10.2M | 135.36% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CBP5) | — | $7.3M | 97.17% |
| [United States Treasury](https://search.stillhousedata.com/security/91282CNC1) | — | $7.2M | 96.10% |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F042640) | — | $7.2M | 95.43% |
| [Freddie Mac](https://search.stillhousedata.com/security/3132DWMX8) | — | $6.8M | 90.91% |
| [Fannie Mae](https://search.stillhousedata.com/security/31418FMJ3) | — | $6.8M | 89.95% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-03-31 | $751.5M |
| 2025-12-31 | $759.0M |
| 2025-09-30 | $745.3M |
| 2025-06-30 | $696.3M |
| 2025-03-31 | $659.2M |
| 2024-12-31 | $581.9M |
| 2024-09-30 | $676.3M |
| 2024-06-30 | $598.6M |

## More

- [Registrant: Core Bond Portfolio](https://search.stillhousedata.com/registrant/1104129)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000005237.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.