# EDGAR Filing Document

**Accession Number:** 0000225322
**File Stem:** 0000878467-23-000001
**Filing Date:** 2023-2
**Character Count:** 2887
**Document Hash:** e1c3b5f2a9223cf4af0ea92bc67f3110
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000878467-23-000001.hdr.sgml**: 20230210

**ACCESSION NUMBER**: 0000878467-23-000001

**CONFORMED SUBMISSION TYPE**: 485APOS

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20230210

**DATE AS OF CHANGE**: 20230210

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FIDELITY SUMMER STREET TRUST
- **CENTRAL INDEX KEY:** 0000225322
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0430

**FILING VALUES:**
- **FORM TYPE:** 485APOS
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-02737
- **FILM NUMBER:** 23609320

**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
**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FIDELITY SUMMER STREET TRUST
- **CENTRAL INDEX KEY:** 0000225322
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0430

**FILING VALUES:**
- **FORM TYPE:** 485APOS
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-58542
- **FILM NUMBER:** 23609319

**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

Securities Act of 1933 Registration No. 002-58542

Investment Company Act of 1940 Registration No. 811-02737

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 [X]

[ ] Pre-Effective Amendment No. ______

[X] Post-Effective Amendment No. __<u>211</u>__

and

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 [X]

[X] Amendment No. __<u>211</u>__

**Fidelity Summer Street Trust**

(Exact Name of Registrant as Specified in Charter)

**245 Summer Street, Boston, Massachusetts 02210**

(Address of Principal Executive Offices)(Zip Code)

Registrant's Telephone Number: **617-563-7000**

**Cynthia Lo Bessette, Secretary and Chief Legal Officer**

**245 Summer Street**

**Boston, Massachusetts 02210**

(Name and Address of Agent for Service)

***It is proposed that this filing will become effective on April 26, 2023 pursuant to paragraph (a)(2) of Rule 485 at 5:30 p.m. Eastern Time.***

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