# EDGAR Filing Document

**Accession Number:** 0000917286
**File Stem:** 0000035402-26-004187
**Filing Date:** 2026-6
**Character Count:** 12179
**Document Hash:** ef1661455e14a2c9d5156eed69d570dc
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000035402-26-004187.hdr.sgml**: 20260626

**ACCESSION NUMBER**: 0000035402-26-004187

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260430

**FILED AS OF DATE**: 20260626

**DATE AS OF CHANGE**: 20260626

**PERIOD START**: 20260430

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FIDELITY HEREFORD STREET TRUST
- **CENTRAL INDEX KEY:** 0000917286

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0430

**FILING VALUES:**
- **FORM TYPE:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-07139
- **FILM NUMBER:** 261127215

**BUSINESS ADDRESS:**
- **STREET 1:** 245 SUMMER STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
- **BUSINESS PHONE:** 617-563-7000

**MAIL ADDRESS:**
- **STREET 1:** 245 SUMMER STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210

## Series and Classes Contracts Data

### Fidelity Series Treasury Bill Index Fund (Series ID: S000062807)

| Class ID   | Class Name                               | Ticker Symbol   |
|:---|:---|:---|
| C000203454 | Fidelity Series Treasury Bill Index Fund | FHQFX           |

## Form NPORT-P: Monthly Portfolio Investments Report

### NPORT-P: Part A: General Information

**Item A.1. Information about the Registrant.**

- **a. Name of Registrant:** Fidelity Hereford Street Trust

- **b. Investment Company Act file number:** 811-07139

- **c. CIK number of Registrant:** 0000917286

- **d. LEI of Registrant:** 549300KQI5JTFSYJTM18

- **e. Address and telephone number of Registrant.**

  - **Street Address 1:** 245 Summer Street

  - **City:** Boston

  - **State:** MA

  - **Foreign country:** US

  - **Zip / Postal Code:** 02210

  - **Telephone number:** 1-800-FIDELITY

**Item A.2. Information about the Series.**

- **a. Name of Series:** Fidelity Series Treasury Bill Index Fund

- **b. EDGAR series identifier (if any):** S000062807

- **c. LEI of Series:** 5493000RGG57MG2DSB62

**Item A.3. Reporting period.**

- **a. Date of fiscal year-end:** 2026-04-30

- **b. Date as of which information is reported:** 2026-04-30

**Item A.4. Final filing**

Does the Fund anticipate that this will be its final filing on Form N-PORT? **No**

### Fund Information

**Total Assets:** $1961750148.56

**Total Liabilities:** $5863410.65

**Net Assets:** $1955886737.91

**Currency Risk Metrics (dv01):**

- 

**Credit Spread Risk - Investment Grade (dv01):**

- **3-Month:** 48625.99741400 | **1-Year:** 3638.54028600 | **5-Year:** 13066.14546400 | **10-Year:** 0.00000000 | **30-Year:** 0.00000000

**Credit Spread Risk - Non-Investment Grade (dv01):**

- **3-Month:** 0.00000000 | **1-Year:** 0.00000000 | **5-Year:** 0.00000000 | **10-Year:** 0.00000000 | **30-Year:** 0.00000000

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000203454 | 0.28%                | 0.31%                | 0.30%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $62426.03                | $-155352.01                                |
| Month 2  | $48387.75                | $-287335.13                                |
| Month 3  | $-124722.39              | $194953.20                                 |

### Schedule of Portfolio Investments

| Name                         | Title                      | Identifiers                                   | Payoff Profile   | Asset Category   | Issuer Category   | Country   |   Balance | Units   | Value (USD)   | % of Net Assets   | Maturity Date   | Coupon Type   | Annualized Rate (%)   | Restricted?   |   Fair Value Level | Lending Status   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| UST BILLS                    | UST BILLS 0% 09/17/2026    | CUSIP: 912797UG0<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 108760000 | PA      | $107250755.97 | 5.48%             | 2026-09-17      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 07/02/2026    | CUSIP: 912797TF4<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 108500000 | PA      | $107825431.63 | 5.51%             | 2026-07-02      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 07/23/2026    | CUSIP: 912797TP2<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 101520000 | PA      | $100677968.76 | 5.15%             | 2026-07-23      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 07/28/2026    | CUSIP: 912797UR6<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  97460000 | PA      | $96610362.24  | 4.94%             | 2026-07-28      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 08/13/2026    | CUSIP: 912797TW7<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 104340000 | PA      | $103259197.24 | 5.28%             | 2026-08-13      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 08/27/2026    | CUSIP: 912797TY3<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 104340000 | PA      | $103111694.91 | 5.27%             | 2026-08-27      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 09/03/2026    | CUSIP: 912797RS8<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 178160000 | PA      | $175941505.36 | 9.00%             | 2026-09-03      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 08/06/2026    | CUSIP: 912797RG4<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 169540000 | PA      | $167899002.00 | 8.58%             | 2026-08-06      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 07/30/2026    | CUSIP: 912797TQ0<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 104120000 | PA      | $103185490.72 | 5.28%             | 2026-07-30      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 08/20/2026    | CUSIP: 912797TX5<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 100980000 | PA      | $99861768.69  | 5.11%             | 2026-08-20      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 09/24/2026    | CUSIP: 912797UH8<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 108760000 | PA      | $107169237.09 | 5.48%             | 2026-09-24      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 07/16/2026    | CUSIP: 912797TN7<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 104520000 | PA      | $103728626.82 | 5.30%             | 2026-07-16      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 06/18/2026    | CUSIP: 912797TD9<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |   1440000 | PA      | $1433072.40   | 0.07%             | 2026-06-18      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 06/16/2026    | CUSIP: 912797UA3<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |   1440000 | PA      | $1433379.69   | 0.07%             | 2026-06-16      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| Fidelity Revere Street Trust | Fidelity Cash Central Fund | CUSIP: 31635A105<br>LEI: 549300BDV45LJNXBZC55 | Long             | STIV             | RF                | US        |  13145006 | NS      | $13147634.72  | 0.67%             |  |  |  | No            |                  1 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 09/10/2026    | CUSIP: 912797UF2<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 105900000 | PA      | $104507362.05 | 5.34%             | 2026-09-10      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 07/09/2026    | CUSIP: 912797RF6<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 170900000 | PA      | $169719479.20 | 8.68%             | 2026-07-09      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 07/21/2026    | CUSIP: 912797UQ8<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  97440000 | PA      | $96654846.99  | 4.94%             | 2026-07-21      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 06/11/2026    | CUSIP: 912797QX8<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |   1540000 | PA      | $1533686.00   | 0.08%             | 2026-06-11      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 07/07/2026    | CUSIP: 912797UN5<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  97460000 | PA      | $96806504.39  | 4.95%             | 2026-07-07      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 07/14/2026    | CUSIP: 912797UP0<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  97460000 | PA      | $96741207.16  | 4.95%             | 2026-07-14      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 06/23/2026    | CUSIP: 912797UB1<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |   1680000 | PA      | $1671012.52   | 0.09%             | 2026-06-23      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |
| UST BILLS                    | UST BILLS 0% 06/30/2026    | CUSIP: 912797UC9<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |   1560000 | PA      | $1550563.62   | 0.08%             | 2026-06-30      | Fixed         | 0.00%                 | No            |                  2 | On Loan: No      |

### Signature

**Date Signed:** 2026-05-30

**Name of Applicant:** Laura M. Del Prato

**Signature:** Laura M. Del Prato

**Name of Signer:** Laura M. Del Prato

**Title:** President and Treasurer