03/04/2026 | Press release | Distributed by Public on 03/04/2026 08:20
111 Huntington Avenue, Boston, Massachusetts 02199
617-954-5000
March 4, 2026
VIA EDGAR
United States Securities and Exchange Commission
100 F Street, N.E.
Washington, D.C. 20549
Re: MFS® Series Trust X (the "Trust") (File Nos. 33-1657 and 811-4492) on behalf of MFS® Emerging Markets Debt Local Currency Fund (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 Statement of Additional Information for the Fund do not differ from those contained in Post-Effective Amendment No. 185 (the "Amendment") to the Trust's Registration Statement on Form N-1A. The Amendment was filed electronically on February 26, 2026.
Please call the undersigned at (617) 954-5655 or Jonathan Umana-Oliveira at (617) 954-5153 with any questions you may have.
Sincerely,
/s/WILLIAM B. WILSON
William B. Wilson
Assistant Vice President and Senior Counsel