UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549





FORM 20-F/A

(Amendment No. 2)







|☐ | 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, 2017

OR



|☐ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------

OR



|☐ | SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | -------------------------------------------------------------------------------------------

Commission File Number: 001-36515





MATERIALISE NV

(Exact
name of Registrant as specified in its charter)





Not
Applicable

(Translation of Registrants name into English)

Kingdom of Belgium

(Jurisdiction of incorporation or organization)

Technologielaan 15, 3001 Leuven, Belgium

(Address of principal executive offices)





Peter Leys,
telephone +32 (16) 39 66 11, facsimile +32 (16) 39 66 00, Technologielaan 15, 3001 Leuven, Belgium

(Name, Telephone, E-mail and/or Facsimile number and Address of Company Contact Person)

Securities registered or to
be registered pursuant to Section 12(b) of the Act:



|                                                                                             |  |                                          
|-------------------------------------------------------------------------------------------- |  | -----------------------------------------
|Title of each
class                                                                          |  | Name of each exchange on
which registered
|American Depositary Shares, each representing one
Ordinary Share, no nominal value per share |  | The NASDAQ Stock Market LLC              
|Ordinary Shares, no nominal value per share*                                                 |  | The NASDAQ Stock Market LLC              



|* | Not for trading but only in connection with the registration of the American Depositary Shares pursuant to the requirements of the Securities and Exchange Commission.
|- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------

Securities registered or to be registered pursuant to Section 12(g) of the Act: None.

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act: None.





The number of outstanding shares of each of the issuers classes of capital or common stock as of December 31, 2017 was: 47,325,438 Ordinary Shares

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities
Act.    ☐  Yes    ☒  No

If this report is an annual or transition report,
indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.    ☐  Yes    ☒  No

Note  Checking the box above will not relieve any registrant required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange
Act of 1934 from their obligations under those Sections.

Indicate by check mark whether the registrant (1) has filed all reports required to be
filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for
the past 90 days.    ☒  Yes    ☐  No

Indicate by check mark whether the
registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of
this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    ☒  Yes    ☐  No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated
filer, or an emerging growth company. See the definitions of large accelerated filer, accelerated filer, and emerging growth company in Rule 12b-2 of the Exchange Act.



|                        |  |   |  |                         |  |  
|----------------------- |  | - |  | ----------------------- |  | -
|Large accelerated filer |  | ☐ |  | Accelerated filer       |  | ☒
|                        |  |   | 
|Non accelerated filer   |  | ☐ |  | Emerging growth company |  | ☒

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if
the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐



| | The term new or revised financial accounting standard refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012.
|- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:



|             |  |                                                                                                          |  |         
|------------ |  | -------------------------------------------------------------------------------------------------------- |  | --------
|U.S. GAAP  ☐ |  | International Financial Reporting Standards as issued by the International Accounting Standards Board  ☒ |  | Other  ☐

If Other has been checked in response to the previous question, indicate by check mark which financial statement
item the registrant has elected to follow.    ☐  Item 17    ☐  Item 18

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule
12b-2 of the Exchange Act.).    ☐  Yes    ☒  No

(APPLICABLE ONLY TO ISSUERS INVOLVED IN BANKRUPTCY PROCEEDINGS DURING THE PAST FIVE YEARS)

Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Sections 12, 13 or 15(d) of the Securities Exchange
Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.    ☐  Yes    ☐  No











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EXPLANATORY NOTE

This
Amendment No. 2 on Form 20-F/A (this Amendment) amends the Annual Report on Form 20-F for the year ended December 31, 2017 of Materialise NV (the
Company), as originally filed with the U.S. Securities and Exchange Commission (the SEC) on April 30, 2018 (the Original Form 20-F), as amended by Amendment No. 1
on Form 20-F/A, as filed with the SEC on May 30, 2018 (Amendment No. 1 and the Original Form 20-F as amended by Amendment No. 1, the
Form 20-F). The Company is filing this Amendment solely to include the financial statements and related notes of RSPRINT Powered by Materialise NV (RSPRINT), and the audit report of BDO
Bedrijfsrevisoren Burg. CVBA relating thereto, as required by Rule 3-09 of Regulation S-X under the Securities Exchange Act of 1934, as amended (Rule 3-09).

The Company owns a 50%
non-controlling interest in RSPRINT and accounts for RSPRINT using the equity method of accounting. RSPRINT met the significant subsidiary test of an equity investee as of and for the years ended
December 31, 2017 and 2016.

The Form 20-F is being further amended to include as
exhibits: (i) audited financial statements of RSPRINT as of and for the years ended December 31, 2017 and 2016 and unaudited financial statements as of and for the year ended December 31, 2015, prepared in accordance with
International Financial Reporting Standards as issued by the International Accounting Standards Board (collectively IFRS); (ii) the consent of BDO Bedrijfsrevisoren Burg. CVBA, the independent auditor of RSPRINT; and
(iii) certifications by the Companys Chief Executive Officer and Chief Financial Officer.

Other than as required to reflect
the amendment discussed above, this Amendment does not, and does not purport to, amend, update or restate any other information in the Original Form 20-F or Amendment No. 1, or reflect any
events that have occurred after the filing of the Original Form 20-F.



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PART III



|ITEM 19. | EXHIBITS
|-------- | --------



|     |  |                                                                                                                                                  
|---- |  | -------------------------------------------------------------------------------------------------------------------------------------------------
|     | 
|12.1 |  | Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                               
|     | 
|12.2 |  | Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                               
|     | 
|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
|     | 
|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
|     | 
|23.1 |  | Consent of BDO Bedrijfsrevisoren Burg. CVBA, independent accountants                                                                             
|     | 
|99.1 |  | Audited Financial Statements of RSPRINT Powered by Materialise NV, as of and for the years ended December 31, 2017 and 2016                      



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Signatures

The registrant hereby certifies that it meets all of the requirements for filing on Form 20-F and that
it has duly caused and authorized the undersigned to sign this Amendment No. 2 to the annual report on its behalf.



|               |  |                        
|-------------- |  | -----------------------
|MATERIALISE NV
|               | 
|By:            |  | /s/ Wilfried Vancraen  
|Name:          |  | Wilfried Vancraen      
|Title:         |  | Chief Executive Officer

Date: June 26, 2018