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Ydès
Ydès is a law firm based in Lyon, founded 1990; the Altss profile covers its classification, headquarters, registration, AUM band, and key contacts for...
Ydès
General information
Firm type
Law Firm
Year founded
1990
Location
Region
Europe
Country
France
City
Lyon
Corporate office
Lyon, France
Additional offices
Paris, France
Principals
Jean-Pierre Viennois
Founding Partner
Frequently asked questions
Who runs investment decisions at Ydès?
Ydès is a law firm — it does not make investment decisions. It advises family offices, owner-managed businesses, and corporate clients on the legal and tax structuring of their investment decisions. Founding partner Jean-Pierre Viennois remains active in firm leadership.
How is Ydès structured compared to other French law firms?
Ydès is an independent French partnership, not affiliated with any international verein or Big Four network. It operates from Lyon and Paris without the lockstep compensation model or cross-border profit-sharing arrangements common among larger French firms. This independence preserves conflict flexibility for its family office and mid-market clients.
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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