The Mulliez family of northern France controls one of Europe’s largest private fortunes — estimated at $48 billion — across operating companies that include Auchan, Decathlon, Leroy Merlin, Boulanger, Kiabi, and Norauto. The family has held these businesses for roughly 90 years across four generations without selling and without going public. The mechanism is worth studying.
The Association Familiale Mulliez
Formed in 1955 by Gérard Mulliez Sr., the AFM is the holding structure that has prevented dilution of family control across hundreds of descendants. By 2020, the AFM had approximately 1,400 family members as shareholders.
The rules are strict: shares cannot be sold to anyone outside the family. Shares are valued by an internal committee rather than by market price. Family members can liquidate to other family members at the internal valuation. Voting power is concentrated through governance mechanisms.
This structural design prevents two failure modes that destroy most family fortunes: external pressure to sell (the IPO temptation) and internal pressure to liquidate (the heir wanting cash).
The operating philosophy
The Mulliez approach to their operating companies has been called “long-term industrial” — they treat each business as a multi-generational asset rather than as an investment to optimize for sale. Capital expenditure decisions span decades. Management compensation is structured around long-term metrics. Leverage is conservative.
The family does not retain operational control directly. Each business has professional management. The family’s role is governance, capital allocation across the portfolio, and protecting the long-term horizon from short-term pressures that public companies experience.
The challenges of scale
With 1,400+ family members across four generations, governance is genuinely complex. The AFM operates with formal voting structures, intra-family arbitration mechanisms, and clear succession protocols. The complexity is the cost of the structure — but it has worked.
Not every family member is wealthy in equal measure. Some live modestly, some lavishly. But the underlying ownership is preserved across generations, and the capital base compounds.
The lessons for other families
The Mulliez structure is bespoke to French law and the specific industries the family operates. But the principles transfer: irrevocable structural commitments to prevent dilution, internal valuation mechanisms to allow generational liquidity, professional management with family governance, and patience measured in decades rather than years.
Families attempting similar structures should retain specialized counsel — the documents are intricate and the consequences of poor drafting compound across generations.
What the Mulliez model is not
It is not a hedge against bad operating decisions. If the underlying businesses fail, the structure does not save them. The discipline of the AFM is the precondition; the quality of the operating businesses is the substance.
Families that focus only on the holding structure without investing in operational excellence at the businesses end with elaborate ownership of declining assets. The Mulliez model worked because both halves of the equation were executed well.
[ QUICK POLL // 60 SECONDS ]