Materialise(MTLS) - 2021 Q4 - Annual Report

Washington, D.C. 20549 FORM 6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2022 Commission File Number: 001-36515 Materialise NV Technologielaan 15 3001 Leuven Belgium (Address of principal executive office) Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F. Form 20-F ☒ Form 40-F ☐ Indicate by check mark ...