# UMBS, TBA Uniform Mortgage-Backed Security, TBA

UMBS, TBA Uniform Mortgage-Backed Security, TBA is a security (CUSIP 01F050643) tracked across SEC portfolio filings. 36 registered fund positions totaling $703.9M via N-PORT as of 2026-03-31.

## Summary

- Issuer: UMBS, TBA
- Class: Uniform Mortgage-Backed Security, TBA
- CUSIP: 01F050643
- Asset category: ABS-MBS
- 13F holders: 0
- N-PORT fund positions: 36
- N-PORT value: $703.9M
- N-PORT report: 2026-03-31

## Top fund holders (N-PORT)

_Showing 15 of 36 fund positions by value._

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [Calvert Bond Fund](https://search.stillhousedata.com/fund/S000008718) | Calvert Social Investment Fund | $355.2M | 838.26% |
| [American Balanced Fund](https://search.stillhousedata.com/fund/S000008801) | American Balanced Fund | $106.8M | 4.05% |
| [Core Bond Portfolio](https://search.stillhousedata.com/fund/S000005237) | Core Bond Portfolio | $79.7M | 1060.79% |
| [LORD ABBETT BOND DEBENTURE FUND INC](https://search.stillhousedata.com/fund/S000006820) | LORD ABBETT BOND DEBENTURE FUND INC | $75.6M | 33.07% |
| [Six Circles Global Bond Fund](https://search.stillhousedata.com/fund/S000068181) | SIX CIRCLES TRUST | $55.2M | 32.44% |
| [Bond Fund of America](https://search.stillhousedata.com/fund/S000009231) | Bond Fund of America | $54.7M | 5.50% |
| Eaton Vance Ltd Duration Income Fund | Eaton Vance Ltd Duration Income Fund | $46.3M | 393.81% |
| [Select Bond Portfolio](https://search.stillhousedata.com/fund/S000000047) | NORTHWESTERN MUTUAL SERIES FUND INC | $42.2M | 148.77% |
| [AB Core Bond Portfolio](https://search.stillhousedata.com/fund/S000011057) | BERNSTEIN SANFORD C FUND INC | $33.2M | 74.22% |
| [AB GLOBAL BOND FUND, INC.](https://search.stillhousedata.com/fund/S000010128) | AB GLOBAL BOND FUND, INC. | $31.2M | 46.74% |
| [Morgan Stanley Long Duration Government Opportunities Fund](https://search.stillhousedata.com/fund/S000002426) | Morgan Stanley Long Duration Government Opportunities Fund | $24.2M | 1068.12% |
| [TCW METWEST LOW DURATION BOND FUND](https://search.stillhousedata.com/fund/S000001146) | TCW Metropolitan West Funds | $23.5M | 263.70% |
| [Pioneer Bond Fund](https://search.stillhousedata.com/fund/S000003927) | Pioneer Bond Fund /DE/ | $19.7M | 39.75% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $10.8M | 1.84% |
| [MML Managed Bond Fund](https://search.stillhousedata.com/fund/S000003834) | MML Series Investment Fund II | $10.5M | 151.45% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/01F050643.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.