MTLS / Materialise NV - Depositary Receipt (Common Stock) - SEC-arkivering, Årsberetning, Fuldmagtserklæring

Materialise NV - Depositary Receipt (Common Stock)
US ˙ NasdaqGS ˙ US57667T1007

Grundlæggende statistik
LEI 5493004CXYDPCZ5RQK28
CIK 1091223
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Materialise NV - Depositary Receipt (Common Stock)
SEC Filings (Chronological Order)
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June 1, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 1 June 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 1 June 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 October 2025,

June 1, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2026 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2026 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

May 29, 2026 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Materialise NV (Exact name of Registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Materialise NV (Exact name of Registrant as specified in its charter) Kingdom of Belgium Commission File Number: Not Applicable (Jurisdiction of incorporation or organization) 001-36515 (IRS Employer Identification No.) Technologielaan 15, 3001 Leuven, Belgium (Address of principal executi

May 29, 2026 EX-1.01

CONFLICT MINERALS REPORT OF MATERIALISE NV

Exhibit 1.01 CONFLICT MINERALS REPORT OF MATERIALISE NV Materialise NV (the "Company") is providing this Conflict Minerals Report pursuant to Rule 13p-1 under the Securities Exchange Act of 1934, as amended, and Form SD for the reporting period from January 1 to December 31, 2025. The terms used in this report are as defined in Rule 13p-1, Form SD and Release No. 34-67716, unless otherwise defined

May 26, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 26 May 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 26 May 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 October 2025,

May 26, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2026 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2026 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 w

May 18, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 18 May 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 18 May 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 October 2025,

May 18, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2026 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2026 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 w

May 15, 2026 EX-99.1

Materialise to Hold Annual Shareholders’ Meeting on June 16, 2026

Exhibit 99.1 Materialise to Hold Annual Shareholders’ Meeting on June 16, 2026 Regulated information1 LEUVEN, Belgium, May 15th, 2026 (GLOBE NEWSWIRE) - Materialise NV (Euronext & NASDAQ &: MTLS), a global leader in 3D-printed medical devices and software, and a pioneer in additive manufacturing software and services, today announced that it will host its Annual General Shareholders’ Meeting (AGM)

May 15, 2026 EX-99.2

Materialise NV Technologielaan 15 3001 Leuven Enterprise number: 0441.131.254 RPR/RPM Leuven (the "Company" or “we”) MANAGEMENT REPORT TO THE ANNUAL GENERAL MEETING TO BE HELD ON 16 JUNE 2026

Exhibit 99.2 Materialise NV Technologielaan 15 3001 Leuven Enterprise number: 0441.131.254 RPR/RPM Leuven (the "Company" or “we”) MANAGEMENT REPORT TO THE ANNUAL GENERAL MEETING TO BE HELD ON 16 JUNE 2026 Ladies and Gentlemen, In accordance with the requirements laid down by law and the articles of association of the Company, the board of directors of the Company (the “Board of Directors”) is plea

May 15, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2026 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2026 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 w

May 11, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 11 May 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 11 May 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 October 2025,

May 11, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2026 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2026 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 w

May 8, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2026 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2026 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 w

May 7, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2026 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2026 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 w

May 7, 2026 EX-99.1

Materialise reports first quarter 2026 results

Exhibit 99.1 Materialise reports first quarter 2026 results Materialise transfers eyewear business to its management team Regulated information1 LEUVEN, Belgium-(BUSINESS WIRE)—May 7, 2026 - Materialise NV (Euronext & NASDAQ:MTLS), a global leader in 3D-printed medical devices and software, and a pioneer in additive manufacturing software and services, today announced its financial results for the

May 4, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 4 May 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 4 May 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 October 2025, i

May 4, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2026 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2026 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 w

April 27, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2026 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2026 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

April 27, 2026 EX-99.1

SHARE-BUY BACK PROGRAM

MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 27 April 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025.

April 23, 2026 EX-99.1

EXHIBIT 99.1

2025 ANNU AL REPORT Published: April 23, 2026 materialise.comContents 1 2 3 4 5 6 7 Introduction At a Glance The Group’s business Investor and Shareholder Information Corporate governance Risk factors and Legal information Operating and financial review Financial statements Non-financial information (CSRD)IntroductionIntroduction This document (the Annual Report) of Materialise NV, a public limite

April 23, 2026 EX-11.1

INSIDER TRADING POLICY

EXHIBIT 11.1 INSIDER TRADING POLICY I.Purpose of this Policy Materialise NV (“Materialise” or the “Company”) has adopted this Insider Trading Policy (this “Policy”) to ensure that any person employed or engaged by the Company, including members of the Board of Directors of Materialise (the “Board”), other PDMRs (as defined below), employees, consultants/private entrepreneurs and contractors and (o

April 23, 2026 EX-12.2

CERTIFICATION

EXHIBIT 12.2 CERTIFICATION I, Koen Berges, certify that: 1. I have reviewed this annual report on Form 20-F of MATERIALISE NV (the “company”); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with r

April 23, 2026 EX-12.1

CERTIFICATION

EXHIBIT 12.1 CERTIFICATION I, Brigitte de Vet- Veithen, certify that: 1. I have reviewed this annual report on Form 20-F of MATERIALISE NV (the “company”); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misl

April 23, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2026 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2026 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

April 23, 2026 EX-13.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002

EXHIBIT 13.2 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of MATERIALISE NV (the “Company”) on Form 20-F for the fiscal year ended December 31, 2025, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Koen Berges, certify, pursuant to 18 U

April 23, 2026 EX-13.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002

EXHIBIT 13.1 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of MATERIALISE NV (the “Company”) on Form 20-F for the fiscal year ended December 31, 2025, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Brigitte de Vet-Veithen, certify, purs

April 23, 2026 EX-2.3

DESCRIPTION OF SECURITIES

EXHIBIT 2.3 DESCRIPTION OF SECURITIES The following description is a summary of certain information relating to the share capital of Materialise NV, certain provisions of the restated articles of association of Materialise NV, the Belgian Companies and Associations Code and the deposit agreement governing the American Depositary Shares, or ADSs, each representing one ordinary share. For the purpos

April 23, 2026 20-F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURIT

April 20, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 20 April 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 20 April 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 October 2

April 20, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2026 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2026 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

April 13, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2026 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2026 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

April 13, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 13 April 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 13 April 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 October 2

April 7, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 7 April 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 7 April 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 October 202

April 7, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2026 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2026 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

March 30, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2026 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2026 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

March 30, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 30 March 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 30 March 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 October 2

March 23, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2026 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2026 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

March 23, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 23 March 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 23 March 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 October 2

March 16, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 16 March 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 16 March 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 October 2

March 16, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2026 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2026 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

March 9, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 9 March 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 9 March 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 October 202

March 9, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2026 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2026 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

March 2, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2026 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2026 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

March 2, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 2 March 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 2 March 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 October 202

February 23, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2026 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2026 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

February 23, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 23 February 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 23 February 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 Oct

February 19, 2026 EX-99.1

Materialise Reports Fourth Quarter and Full Year 2025 Results

Exhibit 99.1 Materialise Reports Fourth Quarter and Full Year 2025 Results Regulated information1 LEUVEN, Belgium-(BUSINESS WIRE)— February 19, 2026 - Materialise NV (Euronext & NASDAQ:MTLS), a global leader in 3D-printed medical devices and software, and a pioneer in additive manufacturing software and services, today announced its financial results for the fourth quarter and full year ended Dece

February 19, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2026 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2026 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

February 19, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2026 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2026 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

February 17, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2026 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2026 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

February 17, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 17 February 2026 – 22h00 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 17 February 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 Oct

February 9, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 9 February 2026 Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 9 February 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 October 2025, in

February 9, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2026 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2026 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

February 2, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2026 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2026 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

February 2, 2026 EX-99.1

MATERIALISE SHARE-BUY BACK PROGRAM

Exhibit 99.1 MATERIALISE SHARE-BUY BACK PROGRAM Leuven – 2 February 2026 – 18:30 CET Regulated information1 Materialise reports on the progress of its share buy-back program announced on 30 October 2025. 2 February 2026 – Materialise NV (Euronext: MTLS) (Nasdaq: MTLS) (“Materialise”) (“the Company”) hereby discloses certain information in relation to its share buyback program announced on 30 Octob

December 2, 2025 EX-99.1

Publication of transparency notification (article 14, first paragraph, of the Law of 2 May 2007 on the disclosure of large shareholdings)

Exhibit 99.1 Publication of transparency notification (article 14, first paragraph, of the Law of 2 May 2007 on the disclosure of large shareholdings) Regulated information[1] Leuven (Belgium) – December, 2 2025, 22:30 CET – Materialise NV (Euronext & Nasdaq: MTLS), a global leader in 3D-printed medical devices and software, and a pioneer in additive manufacturing software and services, today anno

December 2, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2025 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of December 2025 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

November 20, 2025 EX-99.2

COORDINATED STATUTES  14 november 2025  Technologielaan, 15  Heverlee (B-3001 Leuven)  BTW BE0441.131.254 RPR Leuven   NOTARY'S OFFICE  RAES & VAN HAMME ASSOCIATED NOTARIES  Kortrijksesteenweg 1147 B-9051 Ghent  T I +32 9 225 72 88  F I +32 9 224 30

Exhibit 99.2   COORDINATED STATUTES  14 november 2025  "MATERIALISE"  NV  Technologielaan, 15  Heverlee (B-3001 Leuven)  BTW BE0441.131.254 RPR Leuven   NOTARY'S OFFICE  RAES & VAN HAMME ASSOCIATED NOTARIES  Kortrijksesteenweg 1147 B-9051 Ghent  T I +32 9 225 72 88  F I +32 9 224 30 67  www.RVH-Notarissen.be [email protected]  RAES VAN HAMME  NOTARIES  BV  VAT BE0794.752.276  RPR GHENT, GHENT

November 20, 2025 EX-99.1

1

Exhibit 99.1 THIS ANNOUNCEMENT IS NOT DIRECTED AT OR INTENDED TO BE DISTRIBUTED TO PERSONS who are citizen or resident of or located in Switzerland, Canada, Australia, Japan, South Africa OR ANY OTHER JURISDICTION WHERE THE EXTENSION OF AVAILABILITY OF THIS ANNOUNCEMENT WOULD BREACH ANY APPLICABLE LAW OR REGULATION OF OR WOULD REQUIRE ANY REGISTRATION OR LICENCING WITHIN SUCH JURISDICTION. Regulat

November 20, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2025 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2025 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

November 18, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2025 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2025 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

November 18, 2025 EX-99.1

MATERIALISE NV Technologielaan 15, 3001 Leuven, Belgium Admission to trading of all Shares of Materialise NV on Euronext Brussels

Exhibit 99.1 MATERIALISE NV Technologielaan 15, 3001 Leuven, Belgium Admission to trading of all Shares of Materialise NV on Euronext Brussels This prospectus (including all information incorporated by reference herein) (the Prospectus) relates to the admission to trading of all existing shares of and by Materialise NV, a public limited liability company (“naamloze vennootschap”) under Belgian law

November 14, 2025 EX-99.1

Materialise NV Announces Results of 2025 Extraordinary Shareholders’ Meeting

Exhibit 99.1 Materialise NV Announces Results of 2025 Extraordinary Shareholders’ Meeting November 14, 2025 Leuven, Belgium – November 14, 2025 — Materialise NV (NASDAQ: MTLS), a leading provider of additive manufacturing software and of sophisticated 3D printing solutions, today announced the results of the votes cast at its Extraordinary Shareholders’ Meeting, where all the proposed resolutions

November 14, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2025 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2025 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

October 30, 2025 EX-99.1

1

Exhibit 99.1 THIS ANNOUNCEMENT IS NOT DIRECTED AT OR INTENDED TO BE DISTRIBUTED TO PERSONS who are citizen or resident of or located in the United States of America, Switzerland, Canada, Australia, Japan, South Africa OR ANY OTHER JURISDICTION WHERE THE EXTENSION OF AVAILABILITY OF THIS ANNOUNCEMENT WOULD BREACH ANY APPLICABLE LAW OR REGULATION OF OR WOULD REQUIRE ANY REGISTRATION OR LICENCING WIT

October 30, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2025 Commission File Number: 001-36

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2025 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

October 30, 2025 EX-99.2

Materialise to Hold Extraordinary Shareholders’ Meeting on November 14, 2025

Exhibit 99.2 Materialise to Hold Extraordinary Shareholders’ Meeting on November 14, 2025 LEUVEN, Belgium, October 30, 2025 (GLOBE NEWSWIRE) - Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing software and sophisticated 3D printing solutions, today announced that it will host an Extraordinary Shareholders’ Meeting on Friday, November 14, 2025, at 17:00 CET. The Extraordina

October 28, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2025 Commission File Number: 001-36

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2025 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

October 28, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2025 Commission File Number: 001-36

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2025 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

October 28, 2025 EX-99.1

Materialise Reports Third Quarter 2025 Results

Exhibit 99.1 Materialise Reports Third Quarter 2025 Results LEUVEN, Belgium-(BUSINESS WIRE)—October 28, 2025 - Materialise NV (NASDAQ:MTLS), a global leader in 3D-printed medical devices and software and a pioneer in additive manufacturing software and services, today announced its financial results for the third quarter ended September 30, 2025. Highlights – Third Quarter 2025 · Total consolidate

July 24, 2025 EX-99.1

Materialise Reports Second Quarter 2025 Results

Exhibit 99.1 Materialise Reports Second Quarter 2025 Results LEUVEN, Belgium-(BUSINESS WIRE)—July 24, 2025 - Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the second quarter ended June 30, 2025. Highlights – Second Quarter 2025 · Total consolidated revenue decrease

July 24, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 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

July 24, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2025 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

June 12, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2025 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2025 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

June 12, 2025 EX-99.1

Materialise NV Announces Results of 2025 Annual General Shareholders’ Meeting and Extraordinary Shareholders’ Meeting

Exhibit 99.1 Materialise NV Announces Results of 2025 Annual General Shareholders’ Meeting and Extraordinary Shareholders’ Meeting Leuven, Belgium – June 12, 2025—Materialise NV (NASDAQ: MTLS), a leading provider of additive manufacturing software and of sophisticated 3D printing solutions, today announced the results of the votes cast at its Annual General Shareholders’ Meeting held on Tuesday, J

June 12, 2025 EX-3.1

ARTICLES OF ASSOCIATION OF MATERIALISE NV This constitutes an unofficial English translation of the original Dutch document. The Dutch document shall govern in all respects, including interpretation matters.

Exhibit 3.1 ARTICLES OF ASSOCIATION OF MATERIALISE NV This constitutes an unofficial English translation of the original Dutch document. The Dutch document shall govern in all respects, including interpretation matters. HISTORY INCORPORATION Company, according to deed executed before notary Luc Weyts, at the time in Mechelen, on 28 June 1990, an extract of which was published in the Annex to the B

May 16, 2025 EX-99.2

Materialise NV Technologielaan 15 3001 Leuven Enterprise number: 0441.131.254 RPR/RPM Leuven (the "Company" or “we”) MANAGEMENT REPORT TO THE ANNUAL GENERAL MEETING TO BE HELD ON 3 JUNE 2025

Exhibit 99.2 Materialise NV Technologielaan 15 3001 Leuven Enterprise number: 0441.131.254 RPR/RPM Leuven (the "Company" or “we”) MANAGEMENT REPORT TO THE ANNUAL GENERAL MEETING TO BE HELD ON 3 JUNE 2025 Ladies and Gentlemen, In accordance with the requirements laid down by law and the articles of association of the Company, the board of directors of the Company is pleased to report to you about t

May 16, 2025 EX-99.1

Materialise to Hold Annual Shareholders’ Meeting and Extraordinary Shareholders’ Meeting on June 3, 2025

Exhibit 99.1 Materialise to Hold Annual Shareholders’ Meeting and Extraordinary Shareholders’ Meeting on June 3, 2025 LEUVEN, Belgium, May 16, 2025 (GLOBE NEWSWIRE) - Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing software and sophisticated 3D printing solutions, today announced that it will host its Annual General Shareholders’ Meeting (AGM) on Tuesday, June 3, 2025, a

May 16, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2025 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2025 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 w

May 13, 2025 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Materialise NV (Exact name of Registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Materialise NV (Exact name of Registrant as specified in its charter) Kingdom of Belgium Commission File Number: Not Applicable (Jurisdiction of incorporation or organization) 001-36515 (IRS Employer Identification No.) Technologielaan 15, 3001 Leuven, Belgium (Address of principal executi

May 13, 2025 EX-1.01

CONFLICT MINERALS REPORT OF MATERIALISE NV

Exhibit 1.01 CONFLICT MINERALS REPORT OF MATERIALISE NV Materialise NV (the "Company") is providing this Conflict Minerals Report pursuant to Rule 13p-1 under the Securities Exchange Act of 1934, as amended, and Form SD for the reporting period from January 1 to December 31, 2024. The terms used in this report are as defined in Rule 13p-1, Form SD and Release No. 34-67716, unless otherwise defined

April 24, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2025 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2025 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

April 24, 2025 EX-99.1

Materialise Reports First Quarter 2025 Results

Exhibit 99.1 Materialise Reports First Quarter 2025 Results LEUVEN, Belgium-(BUSINESS WIRE)—April 24, 2025 - Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the first quarter ended March 31, 2025. Highlights – First Quarter 2025 · Boosted by 18.7% growth in our Mater

April 24, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2025 Commission File Number: 001-3651

6-K 1 tm2513055d26k.htm FORM 6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2025 Commission File Number: 001-36515 Materialise NV Technologielaan 15 3001 Leuven Belgium (Address of principal executive office) Indicate by check mar

April 22, 2025 EX-12.2

CERTIFICATION

EXHIBIT 12.2 CERTIFICATION I, Koen Berges, certify that: 1. I have reviewed this annual report on Form 20-F of MATERIALISE NV (the “company”); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with r

April 22, 2025 S-8 POS

As filed with the Securities and Exchange Commission on April 22, 2025

As filed with the Securities and Exchange Commission on April 22, 2025 Registration No.

April 22, 2025 EX-11.1

INSIDER TRADING POLICY

EXHIBIT 11.1 INSIDER TRADING POLICY I.Purpose of this Policy The purchase or sale of securities while possessing material nonpublic information (“inside information”) or the disclosure of inside information (“tipping”) to others who may trade in such securities is sometimes referred to as “insider trading” and is prohibited by U.S. federal and state securities laws. As an essential part of your wo

April 22, 2025 EX-13.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002

EXHIBIT 13.2 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of MATERIALISE NV (the “Company”) on Form 20-F for the fiscal year ended December 31, 2024, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Koen Berges, certify, pursuant to 18 U

April 22, 2025 EX-FILING FEES

Calculation of Filing Fee Table Form S-8 (Form Type) Materialise NV (Exact name of Registration as Specified in its Charter) Table 1 – Newly Registered Securities

Exhibit 107.1 Calculation of Filing Fee Table Form S-8 (Form Type) Materialise NV (Exact name of Registration as Specified in its Charter) Table 1 – Newly Registered Securities Security Type Security Class Title(1) File Calculation Rule Amount Registered(2) Proposed Maximum Offering Price Per Unit(3) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Ordinary shares, no no

April 22, 2025 EX-4.3

FORM OF WARRANT AGREEMENT UNDER 2023 WARRANT PLAN This constitutes an unofficial English translation of the original Dutch document. The Dutch document shall govern in all respects, including interpretation matters.

EXHIBIT 4.3 FORM OF WARRANT AGREEMENT UNDER 2023 WARRANT PLAN This constitutes an unofficial English translation of the original Dutch document. The Dutch document shall govern in all respects, including interpretation matters. Between Materialise NV Technologielaan 15 3001 Leuven Belgium Hereinafter referred to as “the Company” hereinafter referred to as “the Selected Participant” Each or both of

April 22, 2025 S-8

As filed with the Securities and Exchange Commission on April 22, 2025

As filed with the Securities and Exchange Commission on April 22, 2025 Registration Statement No.

April 22, 2025 20-F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURIT

April 22, 2025 EX-13.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002

EXHIBIT 13.1 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of MATERIALISE NV (the “Company”) on Form 20-F for the fiscal year ended December 31, 2024, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Brigitte de Vet - Veithen, certify, pu

April 22, 2025 EX-12.1

CERTIFICATION

EXHIBIT 12.1 CERTIFICATION I, Brigitte de Vet- Veithen, certify that: 1. I have reviewed this annual report on Form 20-F of MATERIALISE NV (the “company”); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misl

February 20, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2025 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2025 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

February 20, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2025 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2025 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

February 20, 2025 EX-99.1

Materialise Reports Fourth Quarter and Full Year 2024 Results

Exhibit 99.1 Materialise Reports Fourth Quarter and Full Year 2024 Results LEUVEN, Belgium-(BUSINESS WIRE)— February 20, 2025 - Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software solutions and of sophisticated 3D printing services, today announced its financial results for the fourth quarter and full year ended December 31, 2024. Highlights – Fourth Qua

October 24, 2024 EX-99.1

Materialise Reports Third Quarter 2024 Results

Exhibit 99.1 Materialise Reports Third Quarter 2024 Results LEUVEN, Belgium-(BUSINESS WIRE)—October 24, 2024 - Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the third quarter ended September 30, 2024. Highlights – Third Quarter 2024 · Total revenue increased 14.2%

October 24, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-36

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 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

October 24, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-36

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 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

August 26, 2024 POS AM

As filed with the Securities and Exchange Commission on August 26, 2024

As filed with the Securities and Exchange Commission on August 26, 2024 Registration No.

July 31, 2024 EX-99.1

Materialise Reports Second Quarter 2024 Results

Exhibit 99.1 Materialise Reports Second Quarter 2024 Results LEUVEN, Belgium-(BUSINESS WIRE)—July 31, 2024 - Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the second quarter ended June 30, 2024. Highlights – Second Quarter 2024 · Total revenue increased 6.2% to 68,

July 31, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 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

July 31, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-36515

v UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 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 o

June 7, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2024 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2024 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

June 7, 2024 EX-99.1

Materialise Announces Results of 2024 Annual General Shareholders’ Meeting

Exhibit 99.1 Materialise Announces Results of 2024 Annual General Shareholders’ Meeting Leuven, Belgium – June 7, 2024—Materialise NV (NASDAQ: MTLS), a leading provider of additive manufacturing software and of sophisticated 3D printing solutions, today announced the results of the votes cast at its Annual General Shareholders’ Meeting held on Tuesday, June 4, 2024 at 10.00am (CET). At the Annual

May 22, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 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 w

May 22, 2024 EX-99.2

Materialise NV Technologielaan 15 3001 Leuven Enterprise number: 0441.131.254 RPR/RPM Leuven (the "Company" or “we”) MANAGEMENT REPORT TO THE ANNUAL GENERAL MEETING TO BE HELD ON 4 JUNE 2024

Exhibit 99.2 Final version – Free translation for information purposes only Materialise NV Technologielaan 15 3001 Leuven Enterprise number: 0441.131.254 RPR/RPM Leuven (the "Company" or “we”) MANAGEMENT REPORT TO THE ANNUAL GENERAL MEETING TO BE HELD ON 4 JUNE 2024 Ladies and Gentlemen, In accordance with the requirements laid down by law and the articles of association of the Company, the board

May 22, 2024 EX-99.1

Materialise to Hold Annual Shareholders’ Meeting on June 4, 2024

Exhibit 99.1 Materialise to Hold Annual Shareholders’ Meeting on June 4, 2024 LEUVEN, Belgium, May 22, 2024 (GLOBE NEWSWIRE) - Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing software and sophisticated 3D printing solutions, today announced that it will host its Annual General Shareholders’ Meeting at 10:00 am CEST on Tuesday, June 4, 2024. The convening notices and othe

May 13, 2024 EX-1.01

CONFLICT MINERALS REPORT OF MATERIALISE NV

Exhibit 1.01 CONFLICT MINERALS REPORT OF MATERIALISE NV Materialise NV (the "Company") is providing this Conflict Minerals Report pursuant to Rule 13p-1 under the Securities Exchange Act of 1934, as amended, and Form SD for the reporting period from January 1 to December 31, 2023. The terms used in this report are as defined in Rule 13p-1, Form SD and Release No. 34-67716, unless otherwise defined

May 13, 2024 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Materialise NV (Exact name of Registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Materialise NV (Exact name of Registrant as specified in its charter) Kingdom of Belgium Commission File Number: Not Applicable (Jurisdiction of incorporation or 001-36515 (IRS Employer Identification No.) organization) Technologielaan 15, 3001 Leuven, Belgium (Address of principal executi

April 25, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2024 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2024 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

April 25, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2024 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2024 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

April 25, 2024 EX-99.1

Materialise Reports First Quarter 2024 Results

Exhibit 99.1 Materialise Reports First Quarter 2024 Results LEUVEN, Belgium-(BUSINESS WIRE)—April 25, 2024 - Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the first quarter ended March 31, 2024. Highlights – First Quarter 2024 · Total revenue decreased by 3.4% to 6

April 12, 2024 EX-97.1

MATERIALISE NV COMPENSATION RECOVERY POLICY

EXHIBIT 97.1 MATERIALISE NV COMPENSATION RECOVERY POLICY The Board has determined that it is in the best interests of the Company and its shareholders to adopt this Policy enabling the Company to recover from specified current and former Company executives certain incentive-based compensation in the event of an accounting restatement resulting from material noncompliance with any financial reporti

April 12, 2024 EX-12.1

CERTIFICATION

EXHIBIT 12.1 CERTIFICATION I, Brigitte de Vet- Veithen, certify that: 1.I have reviewed this annual report on Form 20-F of MATERIALISE NV (the “company”); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misle

April 12, 2024 20-F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURIT

April 12, 2024 EX-12.2

CERTIFICATION

EXHIBIT 12.2 CERTIFICATION I, Koen Berges, certify that: 1. I have reviewed this annual report on Form 20-F of MATERIALISE NV (the “company”); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with r

April 12, 2024 EX-4.5

WARRANTS PLAN 2023 (English translation)

EXHIBIT 4.5 WARRANTS PLAN 2023 (English translation) SUBSCRIPTION RIGHTS 2023 REGULATIONS 1.Definitions The terms listed below have the following meaning: Affiliated Company a company affiliated with the Company within the meaning of Article 11 of the Code on Companies and Associations ; Authorized representative of the Board of Directors The person to whom the Board of Directors of the Company ha

April 12, 2024 EX-13.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002

EXHIBIT 13.1 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of MATERIALISE NV (the “Company”) on Form 20-F for the fiscal year ended December 31, 2023, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Brigitte de Vet - Veithen, certify, pu

April 12, 2024 EX-13.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002

EXHIBIT 13.2 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of MATERIALISE NV (the “Company”) on Form 20-F for the fiscal year ended December 31, 2023, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Koen Berges, certify, pursuant to 18 U

February 21, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2024 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2024 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

February 21, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2024 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2024 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

February 21, 2024 EX-99.1

Materialise Reports Fourth Quarter and Full Year 2023 Results

Exhibit 99.1 Materialise Reports Fourth Quarter and Full Year 2023 Results LEUVEN, Belgium-(BUSINESS WIRE)— February 21, 2024 - Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software solutions and of sophisticated 3D printing services, today announced its financial results for the fourth quarter and full year ended December 31, 2023. Highlights – Fourth Qua

October 26, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2023 Commission File Number: 001-36

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2023 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

October 26, 2023 EX-99.2

3D Printing Pioneer Materialise Appoints Brigitte de Vet-Veithen as New CEO

Exhibit 99.2 3D Printing Pioneer Materialise Appoints Brigitte de Vet-Veithen as New CEO Fried Vancraen, Co-founder and CEO, to become Chairman of the Board LEUVEN, Belgium, October 26, 2023 — Materialise NV (NASDAQ:MTLS), a global leader in 3D printing software and services, today announced that the company’s Board of Directors has appointed Brigitte de Vet-Veithen as Chief Executive Officer. Bri

October 26, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2023 Commission File Number: 001-36

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2023 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

October 26, 2023 EX-99.1

Materialise Reports Third Quarter 2023 Results

Exhibit 99.1 Materialise Reports Third Quarter 2023 Results LEUVEN, Belgium-(BUSINESS WIRE)—October 26, 2023 - Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the third quarter ended September 30, 2023. Highlights – Third Quarter 2023 · Total revenue increased 3.2% t

July 26, 2023 EX-99.1

Materialise Reports Second Quarter 2023 Results

Exhibit 99.1 Materialise Reports Second Quarter 2023 Results LEUVEN, Belgium-(BUSINESS WIRE)—July 26, 2023 - Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the second quarter ended June 30, 2023. Highlights – Second Quarter 2023 • Total revenue increased 11.6% to 64

July 26, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2023 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2023 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

July 26, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2023 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2023 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

June 8, 2023 EX-99.1

Materialise Announces Results of 2023 Annual General Shareholders’ Meeting

Exhibit 99.1 Materialise Announces Results of 2023 Annual General Shareholders’ Meeting Leuven, Belgium – June 8, 2023—Materialise NV (NASDAQ: MTLS), a leading provider of additive manufacturing software and of sophisticated 3D printing solutions, today announced the results of the votes cast at its Annual General Shareholders’ Meeting held on Tuesday, June 6, 2023 at 10.00am (CET). At the Annual

June 8, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2023 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2023 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

May 31, 2023 EX-1.01

CONFLICT MINERALS REPORT OF MATERIALISE NV

Exhibit 1.01 CONFLICT MINERALS REPORT OF MATERIALISE NV Materialise NV (the "Company") is providing this Conflict Minerals Report pursuant to Rule 13p-1 under the Securities Exchange Act of 1934, as amended, and Form SD for the reporting period from January 1 to December 31, 2022. The terms used in this report are as defined in Rule 13p-1, Form SD and Release No. 34-67716, unless otherwise defined

May 31, 2023 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Materialise NV (Exact name of Registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Materialise NV (Exact name of Registrant as specified in its charter) Kingdom of Belgium Commission File Number: Not Applicable (Jurisdiction of incorporation or organization) 001-36515 (IRS Employer Identification No.) Technologielaan 15, 3001 Leuven, Belgium (Address of principal executi

May 15, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2023 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2023 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 w

May 15, 2023 EX-99.1

Materialise to Hold Annual Shareholders’ Meeting on June 6, 2023

Exhibit 99.1 Materialise to Hold Annual Shareholders’ Meeting on June 6, 2023 LEUVEN, Belgium, May 15, 2023 (GLOBE NEWSWIRE) - Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing software and of sophisticated 3D printing solutions, today announced that it will host its Annual General Shareholders’ Meeting at 10:00 am CEST on Tuesday, June 6, 2023. The convening notices and o

May 15, 2023 EX-99.2

Materialise NV Technologielaan 15 3001 Leuven Enterprise number: 0441.131.254 RPR/RPM Leuven (the "Company" or “we”) MANAGEMENT REPORT TO THE ANNUAL GENERAL MEETING TO BE HELD ON 6 JUNE 2023

Exhibit 99.2 Final version – Free translation for information purposes only Materialise NV Technologielaan 15 3001 Leuven Enterprise number: 0441.131.254 RPR/RPM Leuven (the "Company" or “we”) MANAGEMENT REPORT TO THE ANNUAL GENERAL MEETING TO BE HELD ON 6 JUNE 2023 Ladies and Gentlemen, In accordance with the requirements laid down by law and the articles of association of the Company, the board

April 27, 2023 EX-99.2

Materialise NV Announces New Chief Financial Officer Koen Berges to Succeed Johan Albrecht

Exhibit 99.2 Materialise NV Announces New Chief Financial Officer Koen Berges to Succeed Johan Albrecht Leuven, Belgium – April 27, 2023 – Materialise NV (NASDAQ: MTLS), a leading provider of additive manufacturing software and sophisticated 3D printing services, today announced that Koen Berges has been named the company’s new chief financial officer effective May 15, 2023. Mr. Berges will succee

April 27, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2023 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2023 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

April 27, 2023 EX-99.1

Materialise Reports First Quarter 2023 Results

Exhibit 99.1 Materialise Reports First Quarter 2023 Results LEUVEN, Belgium-(BUSINESS WIRE)—April 27, 2023 - Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the first quarter ended March 31, 2023. Highlights – First Quarter 2023 · Total revenue increased 24.4% to 65,

April 27, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2023 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2023 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

April 18, 2023 20-F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURIT

April 18, 2023 EX-1.1

Restated Articles of Association of Materialise NV (English translation)

EXHIBIT 1.1 ARTICLES OF ASSOCIATION OF MATERIALISE NV This constitutes an unofficial English translation of the original Dutch document. The Dutch document shall govern in all respects, including interpretation matters. 1. Name - duration - registered office - object ARTICLE 1: Name. The company has the legal form of a public limited company and is named “MATERIALISE”. ARTICLE 2: Duration. The com

April 18, 2023 EX-12.2

Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EXHIBIT 12.2 CERTIFICATION I, Johan Albrecht, certify that: 1. I have reviewed this annual report on Form 20-F of MATERIALISE NV (the “company”); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading wit

April 18, 2023 EX-13.1

Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

EXHIBIT 13.1 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of MATERIALISE NV (the “Company”) on Form 20-F for the fiscal year ended December 31, 2022, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Wilfried Vancraen, certify, pursuant t

April 18, 2023 EX-13.2

Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

EXHIBIT 13.2 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of MATERIALISE NV (the “Company”) on Form 20-F for the fiscal year ended December 31, 2022, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Johan Albrecht, certify, pursuant to 1

April 18, 2023 EX-12.1

Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EXHIBIT 12.1 CERTIFICATION I, Wilfried Vancraen, certify that: 1. I have reviewed this annual report on Form 20-F of MATERIALISE NV (the “company”); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading

February 14, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2023 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2023 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

February 14, 2023 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2023 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2023 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

February 14, 2023 EX-99.1

Materialise Reports Fourth Quarter and Full Year 2022 Results

Exhibit 99.1 Materialise Reports Fourth Quarter and Full Year 2022 Results LEUVEN, Belgium—(BUSINESS WIRE)— February 14, 2023 — Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software solutions and of sophisticated 3D printing services, today announced its financial results for the fourth quarter and full year ended December 31, 2022. Highlights – Fourth Qua

February 10, 2023 SC 13G/A

MTLS / Materialise NV / ARK Investment Management LLC - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No.

October 27, 2022 EX-99.1

Materialise Reports Third Quarter 2022 Results

Exhibit 99.1 Materialise Reports Third Quarter 2022 Results LEUVEN, Belgium?(BUSINESS WIRE)?October 27, 2022 ? Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the third quarter ended September 30, 2022. Highlights ? Third Quarter 2022 ? Total revenue increased 11.7%

October 27, 2022 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2022 Commission File Number: 001-36

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 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

October 27, 2022 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2022 Commission File Number: 001-36

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 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

July 28, 2022 EX-99.1

Materialise Reports Second Quarter 2022 Results

Exhibit 99.1 Materialise Reports Second Quarter 2022 Results LEUVEN, Belgium?(BUSINESS WIRE)?July 28, 2022 ? Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the second quarter ended June 30, 2022. Highlights ? Second Quarter 2022 ? Total revenue increased 14.5% to 58

July 28, 2022 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2022 Commission File Number: 001-36515

6-K 1 d240702d6k.htm 6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2022 Commission File Number: 001-36515 Materialise NV Technologielaan 15 3001 Leuven Belgium (Address of principal executive office) Indicate by check mark whether

July 28, 2022 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2022 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 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

June 13, 2022 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2022 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 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

June 13, 2022 EX-99.1

Materialise Announces Results of 2022 Annual General Shareholders’ Meeting

Exhibit 99.1 Materialise Announces Results of 2022 Annual General Shareholders? Meeting Leuven, Belgium ? June 10, 2022?Materialise NV (NASDAQ: MTLS), a leading provider of additive manufacturing software and of sophisticated 3D printing solutions, today announced the results of the votes cast at its Annual General Shareholders? Meeting held on Tuesday, June 7, 2022 at 10.00am (CET). At the Annual

May 31, 2022 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Materialise NV (Exact name of registrant as specified in its charter) Kingdom of Belgium Commission File Number: Not Applicable (State or ot

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Materialise NV (Exact name of registrant as specified in its charter) Kingdom of Belgium Commission File Number: Not Applicable (State or other jurisdiction of incorporation or organization) 001-36515 (I.R.S. Employer Identification No.) Technologielaan 15, 3001 Leuven, Belgium (Address of

May 31, 2022 EX-1.01

CONFLICT MINERALS REPORT OF MATERIALISE NV

EX-1.01 2 d365351dex101.htm EX-1.01 Exhibit 1.01 CONFLICT MINERALS REPORT OF MATERIALISE NV Materialise NV (the “Company”) is providing this Conflict Minerals Report pursuant to Rule 13p-1 under the Securities Exchange Act of 1934, as amended, and Form SD for the reporting period from January 1 to December 31, 2021. The terms used in this report are as defined in Rule 13p-1, Form SD and Release No

May 16, 2022 EX-99.1

Materialise to Hold Annual Shareholders’ Meeting on June 7, 2022

Exhibit 99.1 Materialise to Hold Annual Shareholders? Meeting on June 7, 2022 LEUVEN, Belgium?May 16, 2022 ? Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing software and of sophisticated 3D printing solutions, today announced that it will host its Annual General Shareholders? Meeting at 10:00 am CEST on Tuesday, June 7, 2022. The convening notices and other documents per

May 16, 2022 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2022 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 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 w

May 2, 2022 EX-1.1

Restated Articles of Association of Materialise NV (English translation)

Exhibit 1.1 This constitutes an unofficial English translation of the original Dutch document. The Dutch document shall govern in all respects, including interpretation matters. ARTICLES OF ASSOCIATION 1. Name - duration - registered office - object ARTICLE 1: Name. The company has the legal form of a public limited company and is named ?MATERIALISE?. ARTICLE 2: Duration. The company is establishe

May 2, 2022 20-F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EX

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F ? REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURIT

May 2, 2022 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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

May 2, 2022 EX-12.2

Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EX-12.2 EXHIBIT 12.2 CERTIFICATION I, Johan Albrecht, certify that: 1. I have reviewed this annual report on Form 20-F of MATERIALISE NV (the “company”); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not mislea

May 2, 2022 EX-13.1

Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

EX-13.1 EXHIBIT 13.1 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of MATERIALISE NV (the “Company”) on Form 20-F for the fiscal year ended December 31, 2021, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Wilfried Vancraen, certify, pu

May 2, 2022 EX-12.1

Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EX-12.1 EXHIBIT 12.1 CERTIFICATION I, Wilfried Vancraen, certify that: 1. I have reviewed this annual report on Form 20-F of MATERIALISE NV (the “company”); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not mis

May 2, 2022 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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

May 2, 2022 EX-13.2

Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

EX-13.2 EXHIBIT 13.2 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of MATERIALISE NV (the “Company”) on Form 20-F for the fiscal year ended December 31, 2021, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Johan Albrecht, certify, pursu

April 28, 2022 EX-99.1

Materialise Reports First Quarter 2022 Results

Exhibit 99.1 Materialise Reports First Quarter 2022 Results LEUVEN, Belgium?(BUSINESS WIRE)?April 28, 2022 ? Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the first quarter ended March 31, 2022. Highlights ? First Quarter 2022 ? Total revenue increased 16.3% to 52,

April 28, 2022 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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

March 3, 2022 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2022 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 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

March 3, 2022 EX-99.1

Materialise Reports Fourth Quarter and Full Year 2021 Results

Exhibit 99.1 Materialise Reports Fourth Quarter and Full Year 2021 Results LEUVEN, Belgium?(BUSINESS WIRE)?March 3, 2022 ? Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the fourth quarter and full year ended December 31, 2021. Highlights ? Fourth Quarter 2021 ? Tot

March 3, 2022 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2022 Commission File Number: 001-3651

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 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

February 14, 2022 SC 13G/A

MTLS / Materialise NV / Nikko Asset Management Americas, Inc. - SC13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* Materialise NV (Name of Issuer) Ordinary Shares, no nominal value per share (Title of Class of Securities) 57667T100 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule

February 9, 2022 SC 13G/A

MTLS / Materialise NV / ARK Investment Management LLC - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No.

February 4, 2022 SC 13G/A

MTLS / Materialise NV / Sumitomo Mitsui Trust Holdings, Inc. - AMENDMENT NO. 2 Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 2*) Materialise NV (Name of Issuer) Ordinary Shares, no nominal value per share (Title of Class of Securities) 57667T100 (CUSIP Number) December 31, 2021 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rul

January 5, 2022 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of January 2022 Commission File Number: 001-36

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of January 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

January 5, 2022 EX-99.1

Materialise Completes Acquisition of Link3D

Exhibit 99.1 Materialise Completes Acquisition of Link3D Acquisition Accelerates Creation of Materialise Software Platform for Additive Manufacturing Leuven (Belgium)?January 5, 2022. Materialise (NASDAQ:MTLS) today announces the closing of its acquisition of Link3D Inc. The closing of the transaction follows Materialise?s earlier announcement confirming the exercise of its option to acquire Link3

November 26, 2021 SC 13G/A

MTLS / Materialise NV / ARK Investment Management LLC - SCHEDULE 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No.

November 15, 2021 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2021 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2021 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

November 15, 2021 EX-99.1

Materialise Exercises Option to Acquire Link3D

Exhibit 99.1 Materialise Exercises Option to Acquire Link3D Acquisition Accelerates Creation of Materialise Software Platform for Additive Manufacturing Leuven (Belgium) ? November 15, 2021. Materialise, a global leader in 3D printing solutions, has agreed to exercise its option to acquire Link3D Inc., an additive workflow and digital manufacturing software company that supports customers in major

October 28, 2021 EX-99.1

Materialise Reports Third Quarter 2021 Results

Exhibit 99.1 Materialise Reports Third Quarter 2021 Results LEUVEN, Belgium?(BUSINESS WIRE)?October 28, 2021 ? Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the third quarter ended September 30, 2021. Highlights ? Third Quarter 2021 ? Total revenue increased 28% to

October 28, 2021 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2021 Commission File Number: 001-36

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2021 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

October 28, 2021 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2021 Commission File Number: 001-36

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2021 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

August 24, 2021 LETTER

LETTER

United States securities and exchange commission logo August 24, 2021 Carla Van Steenbergen Chief Legal Officer Materialise NV 44650 Helm Ct.

August 24, 2021 CORRESP

Materialise NV Technologienlaan 15 3001 Leuven

Materialise NV Technologienlaan 15 3001 Leuven Belgium August 24, 2021 United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.

August 20, 2021 F-3

As filed with the Securities and Exchange Commission on August 20, 2021

Table of Contents As filed with the Securities and Exchange Commission on August 20, 2021 Registration No.

August 20, 2021 POS AM

As filed with the Securities and Exchange Commission on August 20, 2021

As filed with the Securities and Exchange Commission on August 20, 2021 Registration No.

July 29, 2021 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2021 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2021 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

July 29, 2021 EX-99.1

Materialise Reports Second Quarter 2021 Results

Exhibit 99.1 Materialise Reports Second Quarter 2021 Results LEUVEN, Belgium?(BUSINESS WIRE)?July 29, 2021 ? Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the second quarter ended June 30, 2021. Highlights - Second Quarter 2021 ? Total revenue increased 33% to 50,7

July 29, 2021 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2021 Commission File Number: 001-36515

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2021 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

June 14, 2021 EX-1.1

Materialise NV Registered Ordinary Shares in the form of American Depositary Shares (each representing one Ordinary Share, with no nominal value) UNDERWRITING AGREEMENT

Exhibit 1.1 EXECUTION VERSION Materialise NV Registered Ordinary Shares in the form of American Depositary Shares (each representing one Ordinary Share, with no nominal value) UNDERWRITING AGREEMENT June 9, 2021 J.P. Morgan Securities LLC As Representative of the several Underwriters listed in Schedule I hereto c/o J.P. Morgan Securities LLC 383 Madison Avenue New York, New York 10179 Ladies and G

June 14, 2021 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2021 Commission File Number: 001-36515

6-K 1 d167333d6k.htm FORM 6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2021 Commission File Number: 001-36515 Materialise NV Technologielaan 15 3001 Leuven Belgium (Address of principal executive office) Indicate by check mark wh

June 10, 2021 424B5

Joint Book-Running Managers J.P. Morgan Stifel KBC Securities USA KeyBanc Capital Markets

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-226006 Prospectus Supplement (To Prospectus Dated July 6, 2018) 4,000,000 American Depositary Shares Representing 4,000,000 Ordinary Shares Materialise NV We are offering 4,000,000 American Depositary Shares (?ADSs?). Each ADS will represent one ordinary share with no nominal value per share. All of the ADSs offered pursuant t

June 9, 2021 6-K

Form 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2021 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

June 9, 2021 424B5

Joint Book-Running Managers J.P. Morgan Stifel

Table of Contents The information in this prospectus supplement is not complete and may be changed.

June 9, 2021 EX-99.1

2

Exhibit 99.1 INDEX TO CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS Condensed Consolidated Interim Financial Statements as of and for the three months ended March 31, 2021 and 2020 Condensed consolidated income statements (unaudited) 2 Condensed consolidated statements of comprehensive income (unaudited) 3 Condensed consolidated statements of financial position (unaudited) 4 Condensed consol

May 28, 2021 EX-1.01

CONFLICT MINERALS REPORT OF MATERIALISE NV

Exhibit 1.01 CONFLICT MINERALS REPORT OF MATERIALISE NV Materialise NV (the ?Company?) is providing this Conflict Minerals Report pursuant to Rule 13p-1 under the Securities Exchange Act of 1934, as amended, and Form SD for the reporting period from January 1 to December 31, 2020. The terms used in this report are as defined in Rule 13p-1, Form SD and Release No. 34-67716, unless otherwise defined

May 28, 2021 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Materialise NV (Exact name of registrant as specified in its charter) Kingdom of Belgium 001-36515 Not Applicable (State or other jurisdicti

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Materialise NV (Exact name of registrant as specified in its charter) Kingdom of Belgium 001-36515 Not Applicable (State or other jurisdiction of incorporation or organization) (Commission File Number) (IRS Employer Identification No.) Technologielaan 15, 3001 Leuven, Belgium Not Applicabl

April 30, 2021 EX-12.1

Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EXHIBIT 12.1 CERTIFICATION I, Wilfried Vancraen, certify that: 1. I have reviewed this annual report on Form 20-F of MATERIALISE NV (the ?company?); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading

April 30, 2021 EX-2.3

Description of Securities (incorporated by reference to Exhibit 2.3 to the Company’s Annual Report on Form 20-F for the year ended December 31, 2020)

Exhibit 2.3 DESCRIPTION OF SECURITIES The following description is a summary of certain information relating to the share capital of Materialise NV, certain provisions of the restated articles of association of Materialise NV, the Belgian Companies and Associations Code and the deposit agreement governing the American Depositary Shares, or ADSs, each representing one ordinary share. For the purpos

April 30, 2021 EX-12.2

Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EXHIBIT 12.2 CERTIFICATION I, Johan Albrecht, certify that: 1. I have reviewed this annual report on Form 20-F of MATERIALISE NV (the ?company?); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading wit

April 30, 2021 EX-13.2

Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

EXHIBIT 13.2 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of MATERIALISE NV (the ?Company?) on Form 20-F for the fiscal year ended December 31, 2020, as filed with the U.S. Securities and Exchange Commission on the date hereof (the ?Report?), I, Johan Albrecht, certify, pursuant to 1

April 30, 2021 20-F

Form 20-F

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F ? REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURIT

April 30, 2021 EX-1.1

Restated Articles of Association of Materialise NV (English translation)

Exhibit 1.1 This constitutes an unofficial English translation of the original Dutch document. The Dutch document shall govern in all respects, including interpretation matters. ARTICLES OF ASSOCIATION 1. Name - duration - registered office - object ARTICLE 1: Name. The company has the legal form of a public limited company and is named ?MATERIALISE?. ARTICLE 2: Duration. The company is establishe

April 30, 2021 EX-13.1

Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

EXHIBIT 13.1 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE U.S. SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of MATERIALISE NV (the ?Company?) on Form 20-F for the fiscal year ended December 31, 2020, as filed with the U.S. Securities and Exchange Commission on the date hereof (the ?Report?), I, Wilfried Vancraen, certify, pursuant t

April 30, 2021 EX-16.1

Acknowledgement letter of BDO Bedrijfsrevisoren, CVBA

Exhibit 16.1 April 30, 2021 Securities and Exchange Commission 100 F Street N.E. Washington, D.C. 20549 United States of America We have been furnished with a copy of the response to Item 16F of Form 20-F for the event that occurred on November 5, 2020, to be filed by our former client, Materialise NV. We agree with the statements made in response to that Item insofar as they relate to our Firm. V

April 30, 2021 6-K

Current Report of Foreign Issuer - FORM 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2021 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

April 29, 2021 6-K

Current Report of Foreign Issuer - 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2021 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

April 29, 2021 EX-99.1

Materialise Reports First Quarter 2021 Results

Exhibit 99.1 Materialise Reports First Quarter 2021 Results LEUVEN, Belgium?(BUSINESS WIRE)?April 29, 2021 ? Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the first quarter ended March 31, 2021. Highlights ? First Quarter 2021 ? Total revenue was 45,554 kEUR for th

April 13, 2021 6-K

Current Report of Foreign Issuer - FORM 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K 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 2021 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

April 13, 2021 EX-99.1

Materialise Acquires Option to Buy Link3D

Exhibit 99.1 Materialise Acquires Option to Buy Link3D Potential Acquisition to Accelerate Roadmap to Offer Cloud-based Access to Integrated Software Platform Leuven (Belgium) ? April 13, 2021. Materialise, a global leader in 3D printing solutions, has acquired an option to buy Link3D Inc., an additive workflow and manufacturing execution systems (MES) company. The acquisition will extend Material

March 9, 2021 6-K

Current Report of Foreign Issuer - 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2021 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

March 9, 2021 EX-99.1

Segment P&L (Unaudited) In 000 Materialise Software Materialise Medical Materialise Manu- facturing Total segments Unallocated (1)(2) Consoli- dated € € € € € € For the three months ended December 31, 2020 Revenues 10,216 17,188 17,889 45,293 8 45,30

EX-99.1 Exhibit 99.1 Materialise Reports Fourth Quarter and Full Year 2020 Results LEUVEN, Belgium—(BUSINESS WIRE)—March 9, 2021 — Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the fourth quarter and full year ended December 31, 2020. Highlights – Fourth Quarter an

March 9, 2021 6-K

Current Report of Foreign Issuer - FORM 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2021 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

February 16, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 2)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No.

February 11, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Materialise NV

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Materialise NV (Name of Issuer) Ordinary Shares, no nominal value per share (Title of Class of Securities) 57667T100 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule

February 5, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1*)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1*) Materialise NV (Name of Issuer) Ordinary Shares, no nominal value per share (Title of Class of Securities) 57667T100 (CUSIP Number) December 31, 2020 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule

January 5, 2021 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2) Materialise NV (Name of Issuer) Ordinary Shares, no nominal value per share (Title of Class of Securities

SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2) Materialise NV (Name of Issuer) Ordinary Shares, no nominal value per share (Title of Class of Securities) 57667T100 (CUSIP Number) Wilfried Vancraen Technologielaan 15 3001 Leuven Belgium +32 (16) 39 66 11 (Name, address and telephone number of

January 4, 2021 EX-10.2

Letter Agreement Regarding Share Issuance and Registration Rights, dated December 31, 2020, among Materialise NV, Wilfried Vancraen and Hilde Ingelaere (incorporated by reference to Exhibit 10.2 to the Company’s Report on Form 6-K, furnished to the SEC on January 4, 2021)

EX-10.2 Exhibit 10.2 Letter Agreement Regarding Share Issuance and Registration Rights Letter Agreement, dated as of December 31, 2020 (this “Agreement”), among Materialise NV, a limited liability company (naamloze vennootschap) organized and existing under the laws of the Kingdom of Belgium (the “Company”), Wilfried Vancraen (“Mr. Vancraen”) and Hilde Ingelaere (“Ms. Ingelaere” and, together with

January 4, 2021 6-K

Current Report of Foreign Issuer - 6-K

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of January 2021 Commission File Number: 001-36515 Materialise NV Technologielaan 15 3001 Leuven Belgium (Address of principal executive office) Indicate by check mark whether the registrant fi

January 4, 2021 EX-2.1

Merger Deed (English translation) (incorporated by reference to Exhibit 2.1 to the Company’s Report on Form 6-K, furnished to the SEC on January 4, 2021)

EX-2.1 Exhibit 2.1 SR/2200523-1 V26607 Annexes: 3 Rep.: EXTRAORDINARY GENERAL MEETING The year two thousand twenty. On thirty one December. In Ghent, Kortrijksesteenweg 1147, at the offices. Before us, Stijn RAES, notary public in Ghent, second canton. IS HELD: the extraordinary general meeting of the limited liability company “MATERIALISE”, with address at Heverlee (B-3001 Leuven), Technologielaa

January 4, 2021 EX-10.1

Indemnification Agreement, among Materialize NV, Ailanthus NV, Wilfried Vancraen, Hilde Ingelaere and Lunebeke NV (English translation) (incorporated by reference to Exhibit 10.1 to the Company’s Report on Form 6-K, furnished to the SEC on January 4, 2021)

EX-10.1 Exhibit 10.1 THIS AGREEMENT is made on the date mentioned below BETWEEN: (1) Wilfried Vancraen, having his domicile at J. Van der Vorstlaan (LOO) 19, 3040 Huldenberg (“Wilfried Vancraen”); (2) Hilde Ingelaere, having her domicile at J. Van der Vorstlaan (LOO) 19, 3040 Huldenberg (“Hilde Ingelaere”); and (3) Lunebeke NV in formation, a company in formation (in accordance with section 2:2 of

January 4, 2021 EX-99.1

Materialise Announces Results of 2020 Extraordinary General Shareholders’ Meeting

EX-99.1 Exhibit 99.1 Materialise Announces Results of 2020 Extraordinary General Shareholders’ Meeting Leuven, Belgium – January 4, 2021 – Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing software and of sophisticated 3D printing solutions, today announced the results of the votes cast at its extraordinary general shareholders’ meeting held on Thursday, December 31, 2020.

November 30, 2020 EX-99.1

Materialise to Hold Special and Extraordinary General Shareholders’ Meeting on December 31, 2020

EX-99.1 Exhibit 99.1 Materialise to Hold Special and Extraordinary General Shareholders’ Meeting on December 31, 2020 Leuven, Belgium—November 30, 2020—Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing software and of sophisticated 3D printing solutions, today announced that it will host an extraordinary general shareholders’ meeting at 10:30 AM CET on Thursday, December 3

November 30, 2020 6-K

Current Report of Foreign Issuer - 6-K

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2020 Commission File Number: 001-36515 Materialise NV Technologielaan 15 3001 Leuven Belgium (Address of principal executive office) Indicate by check mark whether the registrant f

November 24, 2020 SC 13D/A

MTLS / Materialise NV / Vancraen Wilfried - SC 13D/A Activist Investment

SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1) Materialise NV (Name of Issuer) Ordinary Shares, no nominal value per share (Title of Class of Securities) 57667T100 (CUSIP Number) Wilfried Vancraen Technologielaan 15 3001 Leuven Belgium +32 (16) 39 66 11 (Name, address and telephone number of

November 17, 2020 EX-2.1

Proposal for Merger by Acquisition between Materialise NV and Ailanthus NV (unofficial English translation)

EX-2.1 Exhibit 2.1 This constitutes an unofficial English translation of the original Dutch document. The Dutch document shall govern in all respects, including interpretation matters. MATERIALISE NV AILANTHUS NV Technologielaan 15 J. Van der Vorstlaan (LOO) 19 3001 Leuven 3040 Huldenberg RPR (Commercial court Leuven) RPR (Commercial Court Leuven) 0441.131.254 0461.745.338 PROPOSAL FOR MERGER BY A

November 17, 2020 6-K

Current Report of Foreign Issuer - 6-K

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2020 Commission File Number: 001-36515 Materialise NV Technologielaan 15 3001 Leuven Belgium (Address of principal executive office) Indicate by check mark whether the registrant f

November 10, 2020 6-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K/A (Amendment No. 1) REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2020 Commissio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K/A (Amendment No. 1) REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2020 Commission File Number: 001-36515 Materialise NV Technologielaan 15 3001 Leuven Belgium (Address of principal executive office) Indicate by check mark whether

November 10, 2020 EX-3.1

Articles of Association of Materialise NV (unofficial English translation)

Exhibit 3.1 This constitutes an unofficial English translation of the original Dutch document. The Dutch document shall govern in all respects, including interpretation matters. ARTICLES OF ASSOCIATION 1. Name - duration - registered office - object ARTICLE 1: Name. The company has the legal form of a public limited company and is named ?MATERIALISE?. ARTICLE 2: Duration. The company is establishe

November 9, 2020 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2020 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of November 2020 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

November 9, 2020 EX-3.1

This constitutes an unofficial English translation of the original Dutch document. The Dutch document shall govern in all respects, including interpretation matters.

Exhibit 3.1 This constitutes an unofficial English translation of the original Dutch document. The Dutch document shall govern in all respects, including interpretation matters. ARTICLES OF ASSOCIATION 1. Name - duration - registered office - object ARTICLE 1: Name. The company has the legal form of a public limited company and is named ?MATERIALISE?. ARTICLE 2: Duration. The company is establishe

November 9, 2020 EX-99.1

Materialise Announces Results of 2020 Special and Extraordinary General Shareholders’ Meeting

Exhibit 99.1 Materialise Announces Results of 2020 Special and Extraordinary General Shareholders? Meeting Leuven, Belgium ? November 9, 2020?Materialise NV (NASDAQ: MTLS), a leading provider of additive manufacturing software and of sophisticated 3D printing solutions, today announced the results of the votes cast at its special and extraordinary general shareholders? meeting held on Thursday, No

October 30, 2020 EX-99.1

Materialise to Hold Special and Extraordinary General Shareholders’ Meeting on November 5, 2020

EX-99.1 Exhibit 99.1 Materialise to Hold Special and Extraordinary General Shareholders’ Meeting on November 5, 2020 Leuven, Belgium—October 20, 2020- Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing software and of sophisticated 3D printing solutions, today announced that it will host a special and extraordinary general shareholders’ meeting at 12:00 PM CEST on Thursday,

October 30, 2020 6-K

Current Report of Foreign Issuer - 6-K

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2020 Commission File Number: 001-36515 Materialise NV Technologielaan 15 3001 Leuven Belgium (Address of principal executive office) Indicate by check mark whether the registrant fi

October 29, 2020 6-K

Current Report of Foreign Issuer - FORM 6-K

Form 6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2020 Commission File Number: 001-36515 Materialise NV Technologielaan 15 3001 Leuven Belgium (Address of principal executive office) Indicate by check mark whether the registra

October 29, 2020 EX-99.2

Materialise to Accelerate Digital Transformation in the Footcare Industry

EX-99.2 Exhibit 99.2 Materialise to Accelerate Digital Transformation in the Footcare Industry Materialise Materialise Agrees to Acquire RS Print and RSscan and Enters into Collaboration with Superfeet to Accelerate Personalization of Footcare Solutions Leuven, Belgium, Oct. 29, 2020 (GLOBE NEWSWIRE) — Materialise NV (Nasdaq: MTLS), a global leader in 3D printing solutions, today announced the sig

October 29, 2020 EX-99.1

Segment P&L (Unaudited) In 000 Materialise Software Materialise Medical Materialise Manufacturing Total segments Unallocated (1)(2) Consolidated € € € € € € For the three months ended September 30, 2020 Revenues 9,478 17,161 14,154 40,793 22 40,785 S

EX-99.1 Exhibit 99.1 Materialise Reports Third Quarter 2020 Results LEUVEN, Belgium—(BUSINESS WIRE)—October 29, 2020 — Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the third quarter ended September 30, 2020. Highlights – Third Quarter 2020 • Total revenue was 40,7

October 29, 2020 6-K

Current Report of Foreign Issuer - FORM 6-K

Form 6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2020 Commission File Number: 001-36515 Materialise NV Technologielaan 15 3001 Leuven Belgium (Address of principal executive office) Indicate by check mark whether the registra

October 9, 2020 SC 13G/A

MTLS / Materialise NV / ARK Investment Management LLC - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No.

September 21, 2020 EX-99.1

Materialise and Ditto Join Forces to Advance Digital Technologies in the Eyewear Industry

EX-99.1 Exhibit 99.1 Materialise and Ditto Join Forces to Advance Digital Technologies in the Eyewear Industry Materialise Announces Strategic Investment in Ditto September 21, 2020 07:10 AM Eastern Daylight Time LEUVEN, Belgium & OAKLAND, Calif.—(BUSINESS WIRE)—Materialise NV (Nasdaq:MTLS), a global leader in 3D printing solutions, today announced that it has made a strategic investment in Ditto,

September 21, 2020 6-K

Current Report of Foreign Issuer - 6-K

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of September 2020 Commission File Number: 001-36515 Materialise NV Technologielaan 15 3001 Leuven Belgium (Address of principal executive office) Indicate by check mark whether the registrant

July 30, 2020 EX-99.1

Segment P&L (Unaudited) In 000 Materialise Software Materialise Medical Materialise Manufacturing Total segments Unallocated (1)(2) Consoli– dated € € € € € € For the three months ended June 30, 2020 Revenues 9,540 11,735 16,777 38,052 29 38,117 Segm

EX-99.1 Exhibit 99.1 Materialise Reports Second Quarter 2020 Results LEUVEN, Belgium—(BUSINESS WIRE)—July 30, 2020 — Materialise NV (NASDAQ:MTLS), a leading provider of additive manufacturing and medical software and of sophisticated 3D printing services, today announced its financial results for the second quarter ended June 30, 2020. Highlights – Second Quarter 2020 • Total revenue decreased 21.

July 30, 2020 6-K

Current Report of Foreign Issuer - FORM 6-K

Form 6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2020 Commission File Number: 001-36515 Materialise NV Technologielaan 15 3001 Leuven Belgium (Address of principal executive office) Indicate by check mark whether the registrant

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