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 2025, in accordance with Article 8:4 of the Royal Decree of 29 April 2019 implementing the Belgian Code on Companies and Associations. Under this program, Materialise has granted a discretionary mandate to an independent financial intermediary to repurchase Materialise shares for an amount of up to EUR 30 million.

Materialise reports the purchase of 46,665 Materialise shares in the period from 16 March 2026 up to and including 20 March 2026. The shares were repurchased at an average price of 4.39 EUR per share for a total consideration of 204,627 EUR.

46,665 shares were repurchased through the central order book of the following exchanges:

Date of
repurchase

Exchange

Number of
shares

Total amount
(EUR)

Total amount
(USD)

Average price
(EUR)

16-Mar-2026

NASDAQ

5,269

23,948

27,487

4.55

17-Mar-2026

NASDAQ

4,901

22,379

25,806

4.57

18-Mar-2026

NASDAQ

10,446

46,457

53,426

4.45

19-Mar-2026

NASDAQ

8,667

37,980

43,636

4.38

20-Mar-2026

NASDAQ

17,382

73,862

85,347

4.25

Total of the week

46,665

204,627

235,702

4.39

No shares were repurchased through cross trades or block trades.

Since the start of the share buy-back program on the 26^th of January 2026, Materialise has bought back 448,484 shares for a total amount of 2,039,810 EUR (2,411,424 USD) under the share buy-back program. This corresponds to 0.8% of the total shares outstanding.

Materialise currently holds 448,484 of its own shares.

The overview relating to the share buy-back program is available on https://investors.materialise.com/ and will be updated on a weekly basis.

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

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.

MATERIALISE NV 6-K