# Fidelity Flex U.S. Bond Index Fund

Fidelity Flex U.S. Bond Index Fund is a registered fund series of Fidelity Salem Street Trust (series S000056354). Net assets $4.0B as of 2026-05-31. Index fund.

## Profile

- Series ID: S000056354
- Registrant: Fidelity Salem Street Trust
- LEI: 549300UAIY6D4KDOPE74
- Net assets: $4.0B
- Total assets: $4.2B
- As of: 2026-05-31
- Type: Index

## Advisers

- [FMR Investment Management (UK) Limited (Subadvisor)](https://search.stillhousedata.com/firm/108273)
- [Fidelity Management & Research Company LLC (Advisor)](https://search.stillhousedata.com/firm/108281)
- [Fidelity Management & Research (Hong Kong) Limited (Subadvisor)](https://search.stillhousedata.com/firm/148045)
- [Fidelity Management & Research (Japan) Limited (Subadvisor)](https://search.stillhousedata.com/firm/148239)

## Top holdings (200 reported)

_Showing 15 of 200 holdings by value._

| Holding | Ticker | Value | % of fund |
| --- | --- | --- | --- |
| [Fidelity Revere Street Trust](https://search.stillhousedata.com/security/31635A105) | — | $66.7M | 165.51% |
| [UST NOTES](https://search.stillhousedata.com/security/91282CPZ8) | — | $46.7M | 115.89% |
| [UST NOTES](https://search.stillhousedata.com/security/91282CPT2) | — | $38.3M | 95.12% |
| [UST NOTES](https://search.stillhousedata.com/security/91282CNE7) | — | $37.7M | 93.68% |
| [UST NOTES](https://search.stillhousedata.com/security/91282CNV9) | — | $35.8M | 88.99% |
| [UNITED STATES TREASURY BOND](https://search.stillhousedata.com/security/912810TZ1) | — | $33.2M | 82.35% |
| [UST NOTES](https://search.stillhousedata.com/security/91282CPC9) | — | $32.7M | 81.26% |
| [UST NOTES](https://search.stillhousedata.com/security/91282CQJ3) | — | $32.7M | 81.06% |
| [UST NOTES](https://search.stillhousedata.com/security/91282CMB4) | — | $32.4M | 80.31% |
| [UNITED STATES TREASURY BOND](https://search.stillhousedata.com/security/912810UT3) | — | $31.3M | 77.69% |
| [UST NOTES](https://search.stillhousedata.com/security/91282CNU1) | — | $28.2M | 69.94% |
| [UST NOTES](https://search.stillhousedata.com/security/91282CQN4) | — | $27.1M | 67.38% |
| [UNITED STATES TREASURY BOND](https://search.stillhousedata.com/security/912810TX6) | — | $26.5M | 65.89% |
| [UST NOTES](https://search.stillhousedata.com/security/91282CPP0) | — | $25.9M | 64.30% |
| [UNITED STATES TREASURY BOND](https://search.stillhousedata.com/security/912810UL0) | — | $24.6M | 61.06% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-05-31 | $4.0B |
| 2026-02-28 | $3.8B |
| 2025-11-30 | $3.4B |
| 2025-08-31 | $3.2B |
| 2025-05-31 | $2.8B |
| 2025-02-28 | $2.8B |
| 2024-11-30 | $2.6B |
| 2024-08-31 | $2.4B |

## More

- [Registrant: Fidelity Salem Street Trust](https://search.stillhousedata.com/registrant/35315)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000056354.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.