# EDGAR Filing Document

**Accession Number:** 0002018846
**File Stem:** 0001741773-25-003062
**Filing Date:** 2025-8
**Character Count:** 2148
**Document Hash:** f5a88757e344378dbdea52b3ffc9be52
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001741773-25-003062.hdr.sgml**: 20250829

**ACCESSION NUMBER**: 0001741773-25-003062

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20250829

**DATE AS OF CHANGE**: 20250829

**EFFECTIVENESS DATE**: 20250829

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS Active Exchange Traded Funds Trust
- **CENTRAL INDEX KEY:** 0002018846

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0228

**FILING VALUES:**
- **FORM TYPE:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-278691
- **FILM NUMBER:** 251277115

**BUSINESS ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199
- **BUSINESS PHONE:** 617-954-5000

**MAIL ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199

## Series and Classes Contracts Data

### MFS Active Mid Cap ETF (Series ID: S000094824)

| Class ID   | Class Name             | Ticker Symbol   |
|:---|:---|:---|
| C000263368 | MFS Active Mid Cap ETF |  |

#### 111 Huntington Avenue, Boston, Massachusetts 02199

#### 617-954-5000
August 29, 2025

#### VIA EDGAR
United States Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

#### Re: MFS <sup>®</sup> Active Exchange Traded Funds Trust (the "Trust") (File Nos. 333-278691 and 811-23953) on behalf of MFS <sup>®</sup> Active Mid Cap ETF (the "Fund")
Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, please accept this letter on behalf of the Trust as certification that the Prospectus and the combined Statement of Additional Information for the Fund do not differ from those contained in Post-Effective Amendment No. 4 (the "Amendment") to the Trust's Registration Statement on Form N-1A. The Amendment was filed electronically on August 25, 2025.

Please call the undersigned at (617) 954-5843 or Antoine del Alamo at (617) 954-4586 with any questions you may have.

Sincerely,

BRIAN E. LANGENFELD

Brian E. Langenfeld

Vice President and Managing Counsel

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