An alternative investment platform

Sienna Capital has built a diversified portfolio of talented managers and direct/co-investments alongside top sponsors.

Long-term Investor

Sienna Capital aims to generate risk-adjusted returns, by providing long-term, patient, and supportive capital to its fund managers and portfolio companies.

Active Partner

Sienna Capital acts as an active partner for its investment managers and direct investments. Sienna Capital has created a unique direct investing and fund environment, using its ecosystem to source, collaborate, and invest with best-in-class management teams and companies globally.

About us

Sienna Capital is an alternative investments platform related to the publicly traded investment holding company Groupe Bruxelles Lambert (“GBL”).

Sienna Capital aims to generate attractive risk-adjusted returns by constructing a diversified portfolio of investment managers and direct/co-investments performing extraordinarily well in a broad range of asset classes and strategies.

Our investment decisions are based on a rigorous and consistent process.

Our strategy

Our approach offers a differentiated investment proposition: long term patient capital in exchange for attractive economics and a role as a value-added partner.

Sienna Capital acts as an active partner for the managers it invests with, using its deep expertise to support managers in all aspects of their funds.

Sienna Capital leverages its broad network and strong ties to GBL to source attractive deals.


Sienna Capital has a diversified portfolio consisting of investment managers in a broad range of asset classes, and direct/co-investments alongside top sponsors.

Our Investment Managers

Sienna Capital has invested in nine disclosed asset managers, providing it exposure to a broad range of asset classes and strategies including: private equity, growth capital, venture capital, healthcare, technology, and hedge fund.

Through 19 funds, Sienna Capital has successfully deployed capital into more than 150 underlying companies.

Our Direct and Co-investments

Sienna Capital has successfully made 5 disclosed co-investments alongside top sponsors including: KKR, The Carlyle Group, Backed and Ergon.

Our ESG commitment

As an engaged investor, Sienna Capital believes that responsible management is key to ensure the best interests of its stakeholders. Sienna Capital seeks sustainable growth of its portfolio assets in order to create long-term value.

Sienna Capital London Limited is an Appointed Representative of Mirabella Advisors LLP, which is authorised and regulated by the Financial Conduct Authority number 606792