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Multi Family OfficeInvests through funds, not into companiesLAST VERIFIED Oct 2026 · 3 SOURCES

Cohaesia Family Office

Boulogne-Billancourt family office founded in 2010 that advises private families on the legal, tax and financial side of their wealth and implements the agreed strategy.

Identity

HEADQUARTERS
Boulogne-Billancourt, France
FOUNDED
2010
OUTSIDE CAPITAL
Yes — also manages others' money

Investment approach

GEOGRAPHY
France

Overview

Cohaesia Family Office is a SARL in Boulogne-Billancourt created in 2010 by Agnès Guittard and Stéphanie Zimmermann, both formerly in private wealth roles at Fimagest/Fortis and La Française des Placements. It advises and assists families on their whole estate, coordinating lawyers, notaries and asset managers, and carries out the strategies it recommends. It provides clients with consolidated reports on each asset class, and is registered as an insurance broker and financial investment adviser.

People

  • Agnès Guittard
    Co-founder · source
  • Stéphanie Zimmermann
    Co-founder · source

Frequently asked questions

Cohaesia Family Office is a multi family office based in Boulogne-Billancourt, France, founded in 2010.

Cohaesia Family Office does not publicly state whether it puts its own money into companies or invests through funds.

Key people at Cohaesia Family Office include Agnès Guittard (Co-founder) and Stéphanie Zimmermann (Co-founder).

Yes. Cohaesia Family Office manages capital from outside investors.