# EDGAR Filing Document

**Accession Number:** 0001091223
**File Stem:** 0001104659-25-117796
**Filing Date:** 2025-12
**Character Count:** 6358
**Document Hash:** 9d015a2ea9932c039cf57b308fcf1262
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-117796.hdr.sgml**: 20251202

**ACCESSION NUMBER**: 0001104659-25-117796

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 3

**CONFORMED PERIOD OF REPORT**: 20251202

**FILED AS OF DATE**: 20251202

**DATE AS OF CHANGE**: 20251202

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MATERIALISE NV
- **CENTRAL INDEX KEY:** 0001091223
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-PREPACKAGED SOFTWARE [7372]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 000000000

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36515
- **FILM NUMBER:** 251544211

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** TECHNOLOGIELAAN 15
- **CITY:** LEVUEN
- **PROVINCE COUNTRY:** C9
- **ZIP:** 3001
- **BUSINESS PHONE:** 32 16 39 66 11

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** TECHNOLOGIELAAN 15
- **CITY:** LEVUEN
- **PROVINCE COUNTRY:** C9
- **ZIP:** 3001

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

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**FORM 6-K**

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**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**

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**Materialise NV**

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**Technologielaan 15**

**3001 Leuven**

**Belgium**

**(Address of principal executive office)**

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Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ⌧ Form 40-F ◻

Attached as Exhibit 99.1 hereto is a copy of a press release regarding the receipt by Materialise NV of a transparency notification.

**EXHIBIT INDEX**

---

| | |
|:---|:---|
| **Exhibit** | **Description** |
| [99.1](tm2532603d1_ex99-1.htm) | [Press Release dated December 2, 2025](tm2532603d1_ex99-1.htm) |

---

**SIGNATURE**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

---

| | |
|:---|:---|
| MATERIALISE NV | MATERIALISE NV |
| By: | /s/ Brigitte de Vet-Veithen |
| Name: | Brigitte de Vet-Veithen |
|  | De Vet Management BV |
| Title: | Chief Executive Officer |

---

Date: December 2, 2025

## Exhibit 99.1

**Exhibit 99.1**

![](tm2532603d1_ex99-1img001.jpg)

**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 announces, in application of article 14, first paragraph, of the Law of May 2, 2007 on the disclosure of large shareholdings in issuers whose shares are admitted to trading on a regulated market (the ***Transparency Law***), that on November 28, 2025 it received a transparency notification from Wilfried Vancraen, Hilde Ingelaere and the IDEM partnership.

The notification contains the following information:

&nbsp;&nbsp;&nbsp;&nbsp;· Date
 of the notification: November 28, 2025

&nbsp;&nbsp;&nbsp;&nbsp;· Reason
 for the notification: holding of voting securities upon first admission to trading

&nbsp;&nbsp;&nbsp;&nbsp;· Notification
 by: a parent undertaking or a controlling person

&nbsp;&nbsp;&nbsp;&nbsp;· Persons
 subject to the notification requirement:

---

| | |
|:---|:---|
| &nbsp;&nbsp;**Name** | &nbsp;&nbsp;**Address (for legal entities)** |
| &nbsp;&nbsp;Wilfried Vancraen |  |
| &nbsp;&nbsp;Hilde Ingelaere |  |
| &nbsp;&nbsp;Wilfried Vancraen & Hilde Ingelaere |  |
| &nbsp;&nbsp;IDEM | &nbsp;&nbsp;J. Van der Vorstlaan 19, 3040 Huldenberg, Belgium |

---

&nbsp;&nbsp;&nbsp;&nbsp;· Date
 on which the threshold is crossed: November 20, 2025

&nbsp;&nbsp;&nbsp;&nbsp;· Threshold
 that is crossed: 70%

&nbsp;&nbsp;&nbsp;&nbsp;· Denominator:
 90,712,021

&nbsp;&nbsp;&nbsp;&nbsp;· Notified
 details:

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| **Voting rights** | | **After the transaction** | **After the transaction** | **After the transaction** | **After the transaction** |
|  | **Previous<br> notification**<br>**# of voting rights** | **# of voting rights** | **# of voting rights** | **% of voting rights** | **% of voting rights** |
| **Holders of voting rights** |  | **Linked to<br> securities** | **Not linked to<br> the securities** | **Linked to<br> securities** | **Not linked to<br> the securities** |
| Wilfried Vancraen |  | 248225 |  | 0.27% |  |
| Hilde Ingelaere |  | 248225 |  | 0.27% |  |
| Wilfried Vancraen & Hilde Ingelaere |  | 50000 |  | 0.06% |  |
| IDEM |  | 64768818 |  | 71.40% |  |
| **Total** |  | 65315268 | 0 | 72.00% | 0.00% |

---

[1] The enclosed information constitutes regulated information as defined in the Royal Decree of 14 November 2007 regarding the duties of issuers of financial instruments which have been admitted for trading on a regulated market.

![](tm2532603d1_ex99-1img001.jpg)

&nbsp;&nbsp;&nbsp;&nbsp;· Chain
 of control: IDEM, civil partnership, is controlled by Mr Wilfried Vancraen and Ms Hilde Ingelaere
 in accordance with articles 1:14-1:18 of the Code of companies and associations (CCA).

The transparency notice is available at <u>https://investors.materialise.com/</u>.

**About Materialise**

Materialise incorporates more than three decades of 3D printing experience into a range of software solutions and 3D printing services that empower sustainable 3D printing applications. Our open, secure, and flexible end-to-end solutions enable industrial manufacturing and mass personalization in various industries — including healthcare, automotive, aerospace, eyewear, art and design, wearables, and consumer goods. Headquartered in Belgium and with branches worldwide, Materialise combines the largest group of software developers in the industry with one of the world's largest and most complete 3D printing facilities.

**For more information, please contact:**

Felix Theus

T: +32 16 39 66 11

E:<u>felix.theus@materialise.be</u>

Lina Galvis

T: +32 16 39 66 11

E:<u>lina.galvis@materialise.be</u>