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EXHIBIT 8.1

SUBSIDIARIES OF MATERIALISE NV

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Name

  ​ ​

Jurisdiction of Incorporation

Materialise SAS

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France

Materialise GmbH

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Germany

Materialise Japan K.K.

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Japan

Materialise s.r.o.

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The Czech Republic

Materialise USA, LLC

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United States

OBL SAS

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France

Materialise Austria GmbH

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Austria

MATERIALISE SDN. BHD

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Malaysia

Materialise Ukraine LLC

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Ukraine

RapidFit NV*

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Belgium

Materialise SA

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Poland

Meridian Technique Limited

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United Kingdom

Materialise Netherlands BV

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The Netherlands

Materialise Colombia SAS

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Colombia

Materialise Motion NV

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Belgium

Materialise Shanghai Co. Ltd

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China

Materialise Australia PTY Ltd

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Australia

Materialise S.R.L.

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Italy

ACTech Holding GmbH

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Germany

ACTech GmbH

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Germany

ACTech North America Inc.

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United States

Engimplan Engenharia de Implante Industria E Comércio Ltda

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Brazil

Engimplan Holding Ltda

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Brazil

Materialise Limited

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South Korea

Tianjin Zhenyuan Materialise Medical Technology Ltd

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China

Feops NV

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Belgium

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*Materialise announced on March 31, 2026 the sale of business assets relating to its Rapidfit business to the current management team. Closing of the transaction is expected on or around April 30, 2026.