# EDGAR Filing Document

**Accession Number:** 0000225322
**File Stem:** 0000225322-25-000271
**Filing Date:** 2025-8
**Character Count:** 10089
**Document Hash:** d50fb2e7b4acaf472dea4e1606d8aa97
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000225322-25-000271.hdr.sgml**: 20250828

**ACCESSION NUMBER**: 0000225322-25-000271

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250828

**DATE AS OF CHANGE**: 20250828

**EFFECTIVENESS DATE**: 20250828

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FIDELITY SUMMER STREET TRUST
- **CENTRAL INDEX KEY:** 0000225322

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

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-58542
- **FILM NUMBER:** 251269840

**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

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FIDELITY HIGH INCOME FUND
- **DATE OF NAME CHANGE:** 19890309

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FIDELITY AGGRESSIVE INCOME FUND
- **DATE OF NAME CHANGE:** 19810205

## Series and Classes Contracts Data

### Fidelity Sustainable U.S. Equity Fund (Series ID: S000072129)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                             | Ticker Symbol | Class ID   |
| Fidelity Advisor Sustainable U.S. Equity Fund: Class A | FSEKX         | C000227895 |
| Fidelity Advisor Sustainable U.S. Equity Fund: Class M | FSEPX         | C000227896 |
| Fidelity Advisor Sustainable U.S. Equity Fund: Class C | FSEOX         | C000227897 |
| Fidelity Advisor Sustainable U.S. Equity Fund: Class I | FSEQX         | C000227898 |
| Fidelity Advisor Sustainable U.S. Equity Fund: Class Z | FSEWX         | C000227899 |
| Fidelity Sustainable U.S. Equity Fund                  | FSEBX         | C000227900 |

---

### Fidelity SAI Sustainable Sector Fund (Series ID: S000075898)

---

|  |  |  |
|:---|:---|:---|
| Class Name                           | Ticker Symbol | Class ID   |
| Fidelity SAI Sustainable Sector Fund | FIDJX         | C000235239 |

---

### Fidelity SAI Sustainable U.S. Equity Fund (Series ID: S000075899)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                | Ticker Symbol | Class ID   |
| Fidelity SAI Sustainable U.S. Equity Fund | FIDEX         | C000235240 |

---

## Series and Classes Contracts Data

### Fidelity Sustainable U.S. Equity Fund (Series ID: S000072129)

| Class ID   | Class Name                                             | Ticker Symbol   |
|:---|:---|:---|
| C000227895 | Fidelity Advisor Sustainable U.S. Equity Fund: Class A | FSEKX           |
| C000227896 | Fidelity Advisor Sustainable U.S. Equity Fund: Class M | FSEPX           |
| C000227897 | Fidelity Advisor Sustainable U.S. Equity Fund: Class C | FSEOX           |
| C000227898 | Fidelity Advisor Sustainable U.S. Equity Fund: Class I | FSEQX           |
| C000227899 | Fidelity Advisor Sustainable U.S. Equity Fund: Class Z | FSEWX           |
| C000227900 | Fidelity Sustainable U.S. Equity Fund                  | FSEBX           |

### Fidelity SAI Sustainable Sector Fund (Series ID: S000075898)

| Class ID   | Class Name                           | Ticker Symbol   |
|:---|:---|:---|
| C000235239 | Fidelity SAI Sustainable Sector Fund | FIDJX           |

### Fidelity SAI Sustainable U.S. Equity Fund (Series ID: S000075899)

| Class ID   | Class Name                                | Ticker Symbol   |
|:---|:---|:---|
| C000235240 | Fidelity SAI Sustainable U.S. Equity Fund | FIDEX           |

**Supplement to the**

**Fidelity® SAI Sustainable Sector Fund and Fidelity® SAI Sustainable U.S. Equity Fund**

**July 30, 2025**

**STATEMENT OF ADDITIONAL INFORMATION**

*The following information supplements information for Fidelity® SAI Sustainable Sector Fund found in the "Management Contracts" section.*

The following table provides information relating to other accounts managed by Kenyon Hunt as of June 30, 2025:

---

| | | | |
|:---|:---|:---|:---|
|  | Registered Investment <br> <u>Companies</u>\* | Other Pooled<br> Investment<br> <u>Vehicles</u> | Other<br> <u>Accounts</u> |
| Number of Accounts Managed | 2 |  | 7 |
| Number of Accounts Managed with Performance-Based Advisory Fees |  |  |  |
| Assets Managed (in millions) | $421 |  | $68 |
| Assets Managed with Performance-Based Advisory Fees (in millions) |  |  |  |

---

\* Includes Fidelity® SAI Sustainable Sector Fund ($417 (in millions) assets managed).

As of June 30, 2025, the dollar range of shares of Fidelity® SAI Sustainable Sector Fund beneficially owned by Mr. Hunt was none.

The following table provides information relating to other accounts managed by Anthony Italiano as of June 30, 2025:

---

| | | | |
|:---|:---|:---|:---|
|  | Registered Investment <br> <u>Companies</u>\* | Other Pooled<br> Investment<br> <u>Vehicles</u> | Other<br> <u>Accounts</u> |
| Number of Accounts Managed | 2 |  | 18 |
| Number of Accounts Managed with Performance-Based Advisory Fees |  |  |  |
| Assets Managed (in millions) | $423 |  | $24 |
| Assets Managed with Performance-Based Advisory Fees (in millions) |  |  |  |

---

\* Includes Fidelity® SAI Sustainable Sector Fund ($417 (in millions) assets managed).

As of June 30, 2025, the dollar range of shares of Fidelity® SAI Sustainable Sector Fund beneficially owned by Mr. Italiano was none.

The following table provides information relating to other accounts managed by Michael Robertson as of June 30, 2025:

---

| | | | |
|:---|:---|:---|:---|
|  | Registered Investment <br> <u>Companies</u>\* | Other Pooled<br> Investment<br> <u>Vehicles</u> | Other<br> <u>Accounts</u> |
| Number of Accounts Managed | 4 |  | 5 |
| Number of Accounts Managed with Performance-Based Advisory Fees |  |  |  |
| Assets Managed (in millions) | $494 |  | $12 |
| Assets Managed with Performance-Based Advisory Fees (in millions) |  |  |  |

---

\* Includes Fidelity® SAI Sustainable Sector Fund ($417 (in millions) assets managed).

As of June 30, 2025, the dollar range of shares of Fidelity® SAI Sustainable Sector Fund beneficially owned by Mr. Robertson was none.

The following table provides information relating to other accounts managed by Stacie Wang as of June 30, 2025:

---

| | | | |
|:---|:---|:---|:---|
|  | Registered Investment <br> <u>Companies</u>\* | Other Pooled<br> Investment<br> <u>Vehicles</u> | Other<br> <u>Accounts</u> |
| Number of Accounts Managed | 1 |  | 4 |
| Number of Accounts Managed with Performance-Based Advisory Fees |  |  |  |
| Assets Managed (in millions) | $417 |  | $59 |
| Assets Managed with Performance-Based Advisory Fees (in millions) |  |  |  |

---

\* Includes Fidelity® SAI Sustainable Sector Fund ($417 (in millions) assets managed).

As of June 30, 2025, the dollar range of shares of Fidelity® SAI Sustainable Sector Fund beneficially owned by Ms. Wang was none.

*The following information supplements information for Fidelity® SAI Sustainable U.S. Equity Fund found in the "Management Contracts" section.*

The following table provides information relating to other accounts managed by Preeti Sayana as of June 30, 2025:

---

| | | | |
|:---|:---|:---|:---|
|  | Registered Investment <br> <u>Companies</u>\* | Other Pooled<br> Investment<br> <u>Vehicles</u> | Other<br> <u>Accounts</u> |
| Number of Accounts Managed | 6 | 1 | 3 |
| Number of Accounts Managed with Performance-Based Advisory Fees | 2 |  |  |
| Assets Managed (in millions) | $983 | $55 | $5 |
| Assets Managed with Performance-Based Advisory Fees (in millions) | $171 |  |  |

---

\* Includes Fidelity® SAI Sustainable U.S. Equity Fund ($303 (in millions) assets managed).

As of June 30, 2025, the dollar range of shares of Fidelity® SAI Sustainable U.S. Equity Fund beneficially owned by Ms. Sayana was none.

EFS-SSTK-0825-101-1.9911707.101 August 28, 2025

**Supplement to the**

**Fidelity® Sustainable U.S. Equity Fund**

**July 30, 2025**

**STATEMENT OF ADDITIONAL INFORMATION**

*The following information supplements information found in the "Management Contract" section.*

The following table provides information relating to other accounts managed by Preeti Sayana as of June 30, 2025:

---

| | | | |
|:---|:---|:---|:---|
|  | Registered Investment <br> <u>Companies</u>\* | Other Pooled<br> Investment<br> <u>Vehicles</u> | Other<br> <u>Accounts</u> |
| Number of Accounts Managed | 6 | 1 | 3 |
| Number of Accounts Managed with Performance-Based Advisory Fees | 2 |  |  |
| Assets Managed (in millions) | $983 | $55 | $5 |
| Assets Managed with Performance-Based Advisory Fees (in millions) | $171 |  |  |

---

\* Includes Fidelity® Sustainable U.S. Equity Fund ($29 (in millions) assets managed).

As of June 30, 2025, the dollar range of shares of Fidelity® Sustainable U.S. Equity Fund beneficially owned by Ms. Sayana was none.

SUS-SSTK-0825-102-1.9905032.102 August 28, 2025

**Supplement to the**

**Fidelity® Sustainable U.S. Equity Fund**

**Class A, Class M, Class C, Class I, and Class Z**

**July 30, 2025**

**STATEMENT OF ADDITIONAL INFORMATION**

*The following information supplements information found in the "Management Contract" section.*

The following table provides information relating to other accounts managed by Preeti Sayana as of June 30, 2025:

---

| | | | |
|:---|:---|:---|:---|
|  | Registered Investment <br> <u>Companies</u>\* | Other Pooled<br> Investment<br> <u>Vehicles</u> | Other<br> <u>Accounts</u> |
| Number of Accounts Managed | 6 | 1 | 3 |
| Number of Accounts Managed with Performance-Based Advisory Fees | 2 |  |  |
| Assets Managed (in millions) | $983 | $55 | $5 |
| Assets Managed with Performance-Based Advisory Fees (in millions) | $171 |  |  |

---

\* Includes Fidelity® Sustainable U.S. Equity Fund ($29 (in millions) assets managed).

As of June 30, 2025, the dollar range of shares of Fidelity® Sustainable U.S. Equity Fund beneficially owned by Ms. Sayana was none.

ASUS-SSTK-0825-102-1.9905033.102 August 28, 2025