Its role Investor / Financier
Sienna Investment Managers (Sienna IM) is a pan-European multi-expertise asset manager affiliated with the publicly traded investment holding company Groupe Bruxelles Lambert (GBL). Headquartered in Paris with offices in Luxembourg, London, Milan, Hamburg, Frankfurt, Madrid, Amsterdam, and Seoul, it manages approximately €33-40 billion in assets as of late 2025.
The firm specializes in both listed and private assets, offering strategies across private equity, private credit (including energy transition and biodiversity financing), real estate, and venture capital. It serves institutional and select retail clients through bespoke solutions, with a strong emphasis on sustainability—over 90% of eligible assets under management are classified as Article 8 or 9 under the SFDR framework.
Sienna IM supports long-term investments in sectors like renewable energy infrastructure and low-carbon technologies relevant to industrial decarbonization, though it is not a chemical producer. Its ESG exclusions policy limits exposure to controversial activities, including chemical weapons.
chemXplore tracks 2 projects involving Sienna IM, of which 2 are active.
Closest to start-up first.
Messer deal secures a 10‑year supply pact and a 30% stake in four sites; 2026 revenue guided at €12–13m; German sales accelerating strongly; €45m cash and 36 MW installed capacity.
active all projects
What each is building and closing, and the pipelines and grids between them, on one map.
The 6 sharing the most projects, of 8.
