# EDGAR Filing Document

**Accession Number:** 0001174520
**File Stem:** 0000276776-23-000003
**Filing Date:** 2023-1
**Character Count:** 2869
**Document Hash:** dd7fd4aac1a3085e52ef8feeff60f985
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000276776-23-000003.hdr.sgml**: 20230103

**ACCESSION NUMBER**: 0000276776-23-000003

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20230103

**DATE AS OF CHANGE**: 20230103

**EFFECTIVENESS DATE**: 20230103

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PIONEER SERIES TRUST X
- **CENTRAL INDEX KEY:** 0001174520
- **IRS NUMBER:** 030460956
- **FISCAL YEAR END:** 0331

**FILING VALUES:**
- **FORM TYPE:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-89354
- **FILM NUMBER:** 23501184

**BUSINESS ADDRESS:**
- **STREET 1:** 60 STATE STREET
- **STREET 2:** 5TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109
- **BUSINESS PHONE:** 617-742-7825

**MAIL ADDRESS:**
- **STREET 1:** 60 STATE STREET
- **STREET 2:** 5TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PIONEER FUNDAMENTAL GROWTH FUND
- **DATE OF NAME CHANGE:** 20051213

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PIONEER LARGE CAP GROWTH FUND
- **DATE OF NAME CHANGE:** 20020530

## Series and Classes Contracts Data

### Pioneer Corporate High Yield Fund (Series ID: S000031914)

| Class ID   | Class Name                                 | Ticker Symbol   |
|:---|:---|:---|
| C000099381 | Pioneer Corporate High Yield Fund: Class A | RCRAX           |
| C000099382 | Pioneer Corporate High Yield Fund: Class C | RCRCX           |
| C000099383 | Pioneer Corporate High Yield Fund: Class Y | RCRYX           |
| C000205106 | Pioneer Corporate High Yield Fund: Class K |  |

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[Logo - AMUNDI US]

							January 3, 2023

VIA ELECTRONIC TRANSMISSION
---------------------------

Securities and Exchange Commission
Division of Investment Management
100 F Street, NE
Washington, DC  20549

Re:  Pioneer Series Trust X (the "Trust"), on behlf of Pioneer
     Corporate High Yield Fund (the "Fund");
     (File Nos. 333-89354 and 811-21108)
     CIK No. 0001174520

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, we
certify that the form of the prospectus and statement of additional
information for the Fund, a series of the Trust, which would have been filed
under paragraph (c) of Rule 497, does not differ from that contained in
Post-Effective Amendment No. 57 to the Trust's registration statement on
Form N-1A, filed electronically on December 22, 2022
(Accession No. 0001193125-22-310883).

If you have any questions  concerning the foregoing certification, please
contact me at (617) 422-4388.

					 Very truly yours,

					/s/ Daniel J. Hynes
    					-------------------------
    					Daniel J. Hynes
    					Senior Legal Product Manager

cc:     Christopher J. Kelley, Esq.
        Toby R. Serkin, Esq.

Amundi Asset Management US, Inc.
60 State Street
Boston, MA  02109-1820

```