Currently, Jean-Louis de Cartier de Marchienne occupies the position of Chairman for Cartamundi NV, Chairman at Cartamundi Services NV (a subsidiary of Cartamundi NV) and Chairman for Brepols Publishers BV.

He is also on the board of Promat International NV, SCR-Sibelco NV and FBNet Belgium.

In the past he was Chairman at Etex NV.