# UMBS, TBA Uniform Mortgage-Backed Security, TBA

UMBS, TBA Uniform Mortgage-Backed Security, TBA is a security (CUSIP 01F040446) tracked across SEC portfolio filings. 7 registered fund positions totaling $26.2M via N-PORT as of 2026-03-31.

## Summary

- Issuer: UMBS, TBA
- Class: Uniform Mortgage-Backed Security, TBA
- CUSIP: 01F040446
- Asset category: ABS-MBS
- 13F holders: 0
- N-PORT fund positions: 7
- N-PORT value: $26.2M
- N-PORT report: 2026-03-31

## Top fund holders (N-PORT)

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [TCW METWEST LOW DURATION BOND FUND](https://search.stillhousedata.com/fund/S000001146) | TCW Metropolitan West Funds | $8.7M | 97.36% |
| [Bond Fund of America](https://search.stillhousedata.com/fund/S000009231) | Bond Fund of America | $7.0M | 0.70% |
| [BlackRock Total Return Fund](https://search.stillhousedata.com/fund/S000004071) | BlackRock Bond Fund, Inc. | $5.0M | 2.83% |
| [Six Circles Global Bond Fund](https://search.stillhousedata.com/fund/S000068181) | SIX CIRCLES TRUST | $3.6M | 2.14% |
| [Advantage CoreAlpha Bond Master Portfolio](https://search.stillhousedata.com/fund/S000062381) | Master Investment Portfolio II | $1.2M | 18.51% |
| [BlackRock Balanced Portfolio](https://search.stillhousedata.com/fund/S000003863) | BlackRock Series Fund, Inc. | $447K | 9.61% |
| [BlackRock Strategic Global Bond Fund, Inc.](https://search.stillhousedata.com/fund/S000002866) | BlackRock Strategic Global Bond Fund, Inc. | $132K | 1.50% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/01F040446.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.