Sienna Investment Managers

Sienna Investment Managers is a multi-expertise asset manager of the publicly traded investment holding company Groupe Bruxelles Lambert (GBL). With a team of around 150 professionals, Sienna IM builds bespoke and innovative solutions for its clients, with purpose, spanning listed and private assets. As of end 2025, the Group oversees circa €33 billion under management, of which more than 90% (on the SFDR eligible scope) are classified as Article 8 or 9.