# MORGAN STANLEY MORTGAGE SECURITIES TRUST

MORGAN STANLEY MORTGAGE SECURITIES TRUST (CIK 806564) is an SEC-registered fund company with 1 reporting fund series and $595.1M in net assets as of 2025-07-31.

## Registrant

- CIK: 806564
- File number: 811-04917
- LEI: WKCEPKI1XKBG42N8NC94
- Address: 1585 Broadway, NEW YORK, US-NY, 10036
- Phone: 800-869-6397
- Net assets: $595.1M
- Total assets: $769.3M
- Fund series: 1
- Latest report: 2025-07-31

## Fund series (1)

| Series | Net assets |
| --- | --- |
| [Morgan Stanley Mortgage Securities Trust](https://search.stillhousedata.com/fund/S000002467) | $595.1M |

## Largest reported holdings (across all series)

| Holding | Value |
| --- | --- |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F052680) | $59.7M |
| [United States Treasury](https://search.stillhousedata.com/security/912797QR1) | $37.5M |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F030686) | $25.7M |
| [United States Treasury](https://search.stillhousedata.com/security/912797NA1) | $24.7M |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F042681) | $19.0M |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F050684) | $12.7M |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F060683) | $10.1M |
| [United States Treasury](https://search.stillhousedata.com/security/912797QL4) | $10.0M |
| [United States Treasury](https://search.stillhousedata.com/security/912797QG5) | $9.9M |
| [United States Treasury](https://search.stillhousedata.com/security/912797NU7) | $9.8M |
| [Morgan Stanley & Co. LLC](https://search.stillhousedata.com/security/61747C707) | $8.7M |
| NYKREDIT REALKREDIT AS | $8.2M |
| [Government National Mortgage Association](https://search.stillhousedata.com/security/21H060689) | $7.0M |
| [UMBS, TBA](https://search.stillhousedata.com/security/01F022683) | $6.6M |
| [Su Casita](https://search.stillhousedata.com/security/864248AA7) | $6.2M |

## More

- [CIK 806564 on SEC EDGAR (source of record)](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=806564&type=&dateb=&owner=include&count=40)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/registrant/806564.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.