# EDGAR Filing Document

**Accession Number:** 0000225322
**File Stem:** 0000225322-25-000266
**Filing Date:** 2025-8
**Character Count:** 2524
**Document Hash:** c8f00703c752a9bdc68149d1e65bc2d9
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000225322-25-000266.hdr.sgml**: 20250808

**ACCESSION NUMBER**: 0000225322-25-000266

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250808

**DATE AS OF CHANGE**: 20250808

**EFFECTIVENESS DATE**: 20250808

**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:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-58542
- **FILM NUMBER:** 251196490

**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 Short Duration High Income Fund (Series ID: S000042758)

| Class ID   | Class Name                                                | Ticker Symbol   |
|:---|:---|:---|
| C000132244 | Fidelity Short Duration High Income Fund                  | FSAHX           |
| C000132245 | Fidelity Advisor Short Duration High Income Fund: Class I | FSFHX           |
| C000132246 | Fidelity Advisor Short Duration High Income Fund: Class A | FSBHX           |
| C000132247 | Fidelity Advisor Short Duration High Income Fund: Class M | FSEHX           |
| C000132248 | Fidelity Advisor Short Duration High Income Fund: Class C | FSDHX           |
| C000205018 | Fidelity Advisor Short Duration High Income Fund: Class Z | FIJWX           |

**Supplement to the Fidelity® Short Duration High Income Fund Class A, Class M, Class C, Class I, and Class Z June 28, 2025 Summary Prospectus**

*Eric Mollenhauer no longer serves as Co-Portfolio Manager of the fund*.

*Kevin Nielsen no longer serves as Co-Portfolio Manager of the fund.* 

ASDH-SUSTK-0825-111 1.9881392.111 August 8, 2025

**Supplement to the Fidelity® Short Duration High Income Fund June 28, 2025 Summary Prospectus**

*Eric Mollenhauer no longer serves as Co-Portfolio Manager of the fund*.

*Kevin Nielsen no longer serves as Co-Portfolio Manager of the fund.*

SDH-SUSTK-0825-107 1.9886586.107 August 8, 2025