About us

Sienna Investment Managers is the asset management 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 five 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 €32 billion of asset value.

The group counts more than 280 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.

Sienna Im Timeline Website

of AuM
+ €100m
+ 280


Sienna pays 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 PRI (Evaluation 2021), S&P Global Rating (ESG Evaluation score at 82/100) and Sustainalytics (ESG rating 9.2, “Negligible Risk” status). Sienna IM has been a PRI signatory since 2015, thanks to its initial signatory by Sienna Private Credit. The list of all initiatives joined by Sienna IM and its expertise can be found here.

Solar Panel Park

This applies to 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 apply the best industry standards in terms of ESG:

  • General ESG policy, click here
  • Exclusion policy, click here
  • Salary policy ;
  • Risk integration policy.


Discover Sienna IM’s sustainability organisation – click here

In 2022, Scope 1, 2 and 3 greenhouse gas (GHG) emissions, excluding financed emissions, according to the GHG Protocol, amounted to 4,749 tonnes of CO2e of which :

  • Scope 1 : 55.5 tCO2e – 1%
  • Scope 2 : 46.9 tCO2e – 1%
  • Scope 3 (excluding financed emissions) : 4,646 tCO2e – 98%

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

  • Constant desire to develop a range of products benefiting 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, and in particular by setting up impact financing whose conditions take into account precise ESG parameters. In 2022, Sienna 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. In spring 2022, the group also conducted, alongside SIRSA/Reporting 21, its first direct ESG data collection campaign based on questionnaires developed with Ethifinance.

Our team

Sienna Investment Managers employs more than 280 people organized into specialized investment teams and corporate functions.

Meet our team

Business Meeting

Discover our brochure by clicking here.