About us

Sienna Investment Managers is the alternative investment platform of the publicly traded investment holding company GBL.

Our teams have a proven track record in impact investment and offer a broad spectrum of expertise. Sienna Investment Managers has business lines specializing in the following asset classes: real estate, listed assets, private credit, private equity and venture capital.

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 alternative 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 €30 billion of asset value.

Sienna Investment Managers is authorized by the Commission de Surveillance du Secteur Financier (CSSF) in Luxembourg and by the Autorité des Marchés Financiers (AMF) in France. The company has more than 260 employees, with men and women in almost equal numbers and many nationalities being represented.

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

+ €30bn
of AuM
+ €100m
+ 260


Sienna pays a particular attention to ESG issues in all its investment solutions.

First, this strategy is inspired by the particularly strong commitments of its shareholder GBL- a company listed on Euronext- in the fight against climate change, promotion of diversity, transparency and access to sustainable finance solutions.

In January 2022, GBL became the first investment holding company at the global level to have climate targets aligned with a 1.5°C trajectory validated by the Science Based Targets initiative.

GBL’s achievements are recognized in particular by the UN PRI (Evaluation 2021), S&P Global Rating (ESG Evaluation score at 82/100) and Sustainalytics (ESG rating 9.2, “Negligible Risk” status). These commitments are intended to be followed up quickly by Sienna.

Solar Panel Park

Then, this applies that its regulated asset management subsidiaries, which are subject to all European directives (in particular SFDR and Taxonomy) and local regulation (such as the Energy and Climate Law in France). These subsidiaries thus apply the best industry standards in terms of ESG:

  • General ESG policy ;
  • Exclusion policy ;
  • Salary policy ;
  • Risk integration policy.

Four axes characterize Sienna’s approach beyond these regulatory requirements:

  • Constant desire to develop a range of products benefiting for the vast majority from the best rankings or labels: SRI, Greenfin, LuxFlag, SFDR 8 or 9 ;
  • Notion of impact, which aims to give our financial management a stakeholder dimension for a just transition beyond the role of investor. The notion of impact aims to give our financial management a dimension of actor for a just transition beyond the function of investor, and in particular by setting up impact financing whose conditions take into account precise ESG parameters. In 2022, Sienna has launched 3 impact funds, two of which are in the social field and one concerning the energy transition ;
  • Desire to participate with the major financial “coalitions” in the transition of finance itself in its ESG dimension ;
  • Key role of ESG data, without which diagnoses and action plans too often remain wishful thinking. In this respect, Sienna IM took a stake in Iceberg Data Lab, the environmental data specialist, alongside Axa and Natixis. The group also conducted in spring 2022 with SIRSA/Reporting 21 its first direct ESG data collection campaign based on questionnaires developed with Ethifinance.

Investment Advisory to GBL

Sienna Investment Managers is advising its shareholder GBL for its investments through Sienna Capital. The investments are primarily focused on leading alternative fund managers and direct co-investment in privately owned companies. As of June 30th 2022, the total Net Asset Value of those investments amount to €2.6 billion.

For more information on Sienna Capital Portfolio : Alternative investments – Sienna | GBL

Our team

Sienna Investment Managers employs more than 260 people organized into specialized investment teams and corporate functions.

Meet our team

Business Meeting