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Elyseum Family Office
Elyseum Investment was established in 2011 by Yann Thomas, formerly Managing Director at SGAM Alternative Investments, and Etienne Mouthon. The founders built...
Elyseum Family Office
Elyseum Investment was established in 2011 by Yann Thomas, formerly Managing Director at SGAM Alternative Investments, and Etienne Mouthon. The founders built the platform from their own entrepreneurial wealth and positioned it as an independent multi-family office serving other families and entrepreneurs. The firm remains management-owned and operates from four European offices. Investment activity centers on private equity, real estate private debt and value-add equity, plus direct co-investments in infrastructure and tangible assets. Confirmed holdings include the Manchester Airport Hotel Portfolio, Extendam Mercure Hotel Portfolio in Germany, Western Europe and USA value-add mixed-use assets, HEMS Helicopter Fleet in France and Spain, LCI co-investment helicopter fleet, Flexam Tangible Asset Income Fund fleet and Vectron Locomotives in Europe. The firm also holds positions in renewable energy producer Langa International and the Windward Offshore wind project. Geographic exposure spans Europe, North America and Africa. Investment stages include buyout, growth and venture capital. The platform reports a combined portfolio exceeding €2.5 billion. It maintains a business partnership with 123Venture through RIVE Private Investment and works with Libra Group on helicopter co-investment vehicles. Philanthropic activity includes support for the Lead Like a Girl programme in South Africa via The Beast Foundation. No dated operational events from the last 24 months appear in public sources. Elyseum Investment functions as a management-owned independent group rather than a captive single-family office. This structure allows it to offer discretionary portfolio management and financial engineering services to multiple external families while deploying its own capital alongside them in co-investment vehicles.
General information
Firm type
Multi Family Office
Year founded
2011
AUM
Over €2.5 billion (per firm website)
Location
Region
Europe
Country
Switzerland
City
Geneva
Corporate office
7 Rue des Alpes – 1201 Genève, Switzerland
Additional offices
Paris, France · London, United Kingdom · Luxembourg
Principals
Yann Thomas
Founder
Etienne Mouthon
Founder
Sector focus
Frequently asked questions
Who runs investment decisions at Elyseum Family Office?
Yann Thomas and Etienne Mouthon, the founding partners, lead investment decisions. Thomas previously served as Managing Director at SGAM Alternative Investments. Mouthon also serves as Director of RIVE Private Investment.
How does Elyseum source proprietary deal flow?
The firm leverages its network of business partners including 123Venture and Libra Group. It also draws on relationships developed through prior roles at SGAM Alternative Investments and through its own direct asset platforms in infrastructure and real estate.
Does Elyseum participate in fund commitments or only direct deals?
Elyseum executes both fund commitments and direct co-investments through SPVs. Its private equity and infrastructure activity includes direct holdings in renewable energy, aviation assets and rail equipment alongside external managers.
What investment stages does Elyseum typically target?
The firm targets buyout, growth and venture capital stages. Its infrastructure and real estate mandates focus on value-add and operational improvement rather than early-stage development.
Where does the underlying wealth come from?
The platform originated from the entrepreneurial wealth of founders Yann Thomas and Etienne Mouthon. It now manages capital for additional families and entrepreneurs under a multi-family office mandate.
Does Elyseum maintain philanthropic structures?
Elyseum supports the Lead Like a Girl programme in South Africa through its partnership with The Beast Foundation. No separate family foundation is disclosed in public materials.
What is Elyseum's known posture on co-investments alongside external GPs?
The firm regularly structures co-investment vehicles with partners such as Libra Group on aviation assets and with 123Venture through RIVE Private Investment. It also deploys capital directly into renewable energy and real estate projects.
Profile maintained by Altss using OSINT (open-source intelligence), regulatory filings, licensed data partners, and verified direct submissions. Read the methodology. Last updated: . Continuous refresh with full update cycles at least every 30 days.
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