William Demant Invest A/S is an evergreen investment company, wholly owned by the charitable William Demant Foundation. William Demant Invest is the majority shareholder in Demant, Ãssur and Vision RT and has significant holdings in Vitrolife, CellaVision, Jeudan and Borkum Riffgrund 1. When investing in new companies, William Demant Invest generally looks for medtech/healthcare industries and strong underlying market factors such as demographic trends and structural growth.