# EDGAR Filing Document

**Accession Number:** 0001891490
**File Stem:** 0001445546-23-000645
**Filing Date:** 2023-1
**Character Count:** 1459
**Document Hash:** 59b21089978c4f7bd66f91d388f6520a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001445546-23-000645.hdr.sgml**: 20230126

**ACCESSION NUMBER**: 0001445546-23-000645

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20230126

**DATE AS OF CHANGE**: 20230126

**EFFECTIVENESS DATE**: 20230126

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FIRST TRUST COMBINED SERIES 621
- **CENTRAL INDEX KEY:** 0001891490
- **IRS NUMBER:** 000000000

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-268808
- **FILM NUMBER:** 23555413

**BUSINESS ADDRESS:**
- **STREET 1:** C/O FIRST TRUST PORTFOLIOS L.P.
- **STREET 2:** 120 EAST LIBERTY DRIVE, SUITE 400
- **CITY:** WHEATON
- **STATE:** IL
- **ZIP:** 60187
- **BUSINESS PHONE:** 630 765 8000

**MAIL ADDRESS:**
- **STREET 1:** C/O FIRST TRUST PORTFOLIOS L.P.
- **STREET 2:** 120 EAST LIBERTY DRIVE, SUITE 400
- **CITY:** WHEATON
- **STATE:** IL
- **ZIP:** 60187

NO SERIES-AND-CLASSES-CONTRACTS-DATA BLOCK FOUND

```

                                                                   Rule 497(d)

                     The First Trust(R) Combined Series 621
    Tax Exempt Municipal Income Trust, Intermediate, Series 47 (the "Trust")

                          Supplement to the Prospectus

           Notwithstanding anything to the contrary in the Prospectus, the due
date of the Fire Protection District No. 4, Benton County, Washington bond is
12/01/2033.

January 26, 2023

```