About us

Sienna Investment Managers is a multiple-expertise pan-European asset manager of the publicly traded investment holding company GBL. Spanning listed and private assets (real estate, private debt, private equity, and venture capital), Sienna IM builds bespoke and innovative solutions for its clients, with purpose.

Our mission

Sienna Investment Managers seeks to challenge the status quo and change mindsets with the firm belief that today’s investments shape the communities of tomorrow. While we naturally strive for performance, we are also committed to priviledge investments that have a positive impact. In the current environment, investors are looking for more than results: their asset managers must commit to making a difference, while anticipating, analyzing, and managing risk in a judicious and agile manner.

Our clients benefit from all of the experience and knowledge of the private markets that Sienna Investment Managers’ investment professionals have accumulated over many years within the GBL group.


Starting with a project initiated in 2013, Sienna Investment Managers is currently managing €34 billion of asset value.

The group counts around 300 employees, with men and women in almost equal numbers and over 20 nationalities being represented.

Thanks to the track record it has built and with the backing of the GBL group, Sienna Investment Managers’ ambition is to become a European leader in third-party asset management.

of AuM
+ €100m
~ 300

Our team

Sienna Investment Managers employs around 300 people organized into specialized investment teams and corporate functions.

Meet our team

Business Meeting

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