# Putnam Mortgage Securities Fund

Putnam Mortgage Securities Fund (CIK 732337) is an SEC-registered fund company with 1 reporting fund series and $386.6M in net assets as of 2026-03-31.

## Registrant

- CIK: 732337
- File number: 811-03897
- LEI: V36NQTUWG8SKLKSHZZ27
- Address: 100 Federal Street, Boston, US-MA, 02110
- Phone: 617-292-1000
- Net assets: $386.6M
- Total assets: $1.5B
- Fund series: 1
- Latest report: 2026-03-31

## Fund series (1)

| Series | Net assets |
| --- | --- |
| [Putnam Mortgage Securities Fund](https://search.stillhousedata.com/fund/S000006570) | $386.6M |

## Largest reported holdings (across all series)

| Holding | Value |
| --- | --- |
| [FNMA or FHLMC](https://search.stillhousedata.com/security/01F052649) | $110.5M |
| [FNMA or FHLMC](https://search.stillhousedata.com/security/01F060642) | $73.4M |
| [FNMA or FHLMC](https://search.stillhousedata.com/security/01F062648) | $71.4M |
| [FNMA or FHLMC](https://search.stillhousedata.com/security/01F020646) | $60.4M |
| [Putnam Short Term Investment Fund](https://search.stillhousedata.com/security/74676P664) | $53.5M |
| [FNMA or FHLMC](https://search.stillhousedata.com/security/01F022642) | $36.2M |
| [FNMA or FHLMC](https://search.stillhousedata.com/security/01F030645) | $22.8M |
| [FNMA or FHLMC](https://search.stillhousedata.com/security/01F032641) | $22.0M |
| [FNMA or FHLMC](https://search.stillhousedata.com/security/01F042640) | $18.8M |
| [FNMA or FHLMC](https://search.stillhousedata.com/security/01F020448) | $16.6M |
| [GNMA](https://search.stillhousedata.com/security/21H022648) | $13.8M |
| [GNMA](https://search.stillhousedata.com/security/21H032647) | $12.8M |
| [GNMA](https://search.stillhousedata.com/security/21H020642) | $12.4M |
| [GNMA](https://search.stillhousedata.com/security/21H060648) | $12.2M |
| [GNMA](https://search.stillhousedata.com/security/21H040640) | $12.2M |

## More

- [CIK 732337 on SEC EDGAR (source of record)](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=732337&type=&dateb=&owner=include&count=40)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/registrant/732337.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.