# Fidelity Series Treasury Bill Index Fund

Fidelity Series Treasury Bill Index Fund is a registered fund series of Fidelity Hereford Street Trust (series S000062807). Net assets $2.0B as of 2026-04-30. Index fund.

## Profile

- Series ID: S000062807
- Registrant: Fidelity Hereford Street Trust
- LEI: 5493000RGG57MG2DSB62
- Net assets: $2.0B
- Total assets: $2.0B
- As of: 2026-04-30
- 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 (23 reported)

_Showing 15 of 23 holdings by value._

| Holding | Ticker | Value | % of fund |
| --- | --- | --- | --- |
| [UST BILLS](https://search.stillhousedata.com/security/912797RS8) | — | $175.9M | 899.55% |
| [UST BILLS](https://search.stillhousedata.com/security/912797RF6) | — | $169.7M | 867.74% |
| [UST BILLS](https://search.stillhousedata.com/security/912797RG4) | — | $167.9M | 858.43% |
| [UST BILLS](https://search.stillhousedata.com/security/912797TF4) | — | $107.8M | 551.29% |
| [UST BILLS](https://search.stillhousedata.com/security/912797UG0) | — | $107.3M | 548.35% |
| [UST BILLS](https://search.stillhousedata.com/security/912797UH8) | — | $107.2M | 547.93% |
| [UST BILLS](https://search.stillhousedata.com/security/912797UF2) | — | $104.5M | 534.32% |
| [UST BILLS](https://search.stillhousedata.com/security/912797TN7) | — | $103.7M | 530.34% |
| [UST BILLS](https://search.stillhousedata.com/security/912797TW7) | — | $103.3M | 527.94% |
| [UST BILLS](https://search.stillhousedata.com/security/912797TQ0) | — | $103.2M | 527.56% |
| [UST BILLS](https://search.stillhousedata.com/security/912797TY3) | — | $103.1M | 527.19% |
| [UST BILLS](https://search.stillhousedata.com/security/912797TP2) | — | $100.7M | 514.74% |
| [UST BILLS](https://search.stillhousedata.com/security/912797TX5) | — | $99.9M | 510.57% |
| [UST BILLS](https://search.stillhousedata.com/security/912797UN5) | — | $96.8M | 494.95% |
| [UST BILLS](https://search.stillhousedata.com/security/912797UP0) | — | $96.7M | 494.62% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-04-30 | $2.0B |
| 2026-01-31 | $1.9B |
| 2025-10-31 | $1.7B |
| 2025-07-31 | $1.6B |
| 2025-04-30 | $1.6B |
| 2025-01-31 | $1.4B |
| 2024-10-31 | $1.4B |
| 2024-07-31 | $1.4B |

## More

- [Registrant: Fidelity Hereford Street Trust](https://search.stillhousedata.com/registrant/917286)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000062807.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.