The Mulliez story begins in and around Roubaix, in northern France — a region of spinning mills, textile factories and Catholic business families.[page:25] By the mid‑20th century, the clan had already produced several entrepreneurs, but the real consolidation came in 1955 when Gérard Mulliez and relatives created Association Familiale Mulliez as a kind of shareholder pact for the family.[page:25]

AFM is not a flashy listed company. It is a private holding designed to keep control of multiple brands inside a single extended family.[page:25] The idea is simple and radical at the same time: instead of each cousin going off to build a separate fortune, everyone buys into the same pool of businesses and agrees to manage them collectively. In a French context, it has been described as a kind of “family communism” — capital held in common, deployed for growth.[page:25]

The Mulliez clan’s motto, “Tous dans tout,” captures their operating code: all family members in all businesses.[page:25] In practice, this means that cousins do not just own a slice of one chain; they share exposure to the entire ecosystem — from hypermarkets and DIY to sports, fashion, automotive services and finance. It is a way to lock loyalty and diversify risk across generations.

AFM itself is structured as a pacte d’actionnaires — a shareholder agreement framework under French law — that binds family shareholders around common rules for governance and succession.[page:25] They can debate strategy, but selling out to outsiders is structurally difficult. That is why, even after decades of expansion and crisis, the big banners are still ultimately “Mulliez companies,” not just anonymous corporations.

The most visible piece of the AFM empire is Auchan, one of Europe’s largest hypermarket chains, in which the family controls around 84%.[page:25] From Northern France the brand spread through Western and Eastern Europe and into Asia, bringing the Mulliez family’s model of large, car‑oriented hypermarkets and private-label goods to millions of households.[page:25]

Alongside grocery, AFM controls Adeo, a group of hardware and DIY retailers that includes Leroy Merlin, Bricoman, Weldom and Zodio.[page:25] Leroy Merlin alone has become a dominant home‑improvement brand in France and several other countries. Through Adeo, the family owns the “fixing your house” aisle just as much as Auchan owns the weekly groceries. The combination of food and DIY puts AFM at the center of both everyday consumption and big-ticket home spending.

If Auchan and Leroy Merlin handle food and bricks, Decathlon handles bodies in motion. AFM holds about 85% of Decathlon, the discount sports retailer whose blue‑and‑white boxes dominate the outskirts of European cities.[page:25] Selling own‑brand equipment across dozens of sports, Decathlon has become one of the most successful sporting‑goods chains in the world — and a textbook example of the family’s love for private labels and scale.[page:25]

In clothing, the family is behind Kiabi, Pimkie (until selling it in 2023), Phildar and men’s fashion chains like Brice and Jules, often grouped under structures like Happychic.[page:25] These banners target mass‑market segments: kids, “young women,” budget menswear. By covering multiple demographics and price points, AFM turns textile know‑how from the old Roubaix mills into modern fast‑fashion volume — largely without a luxury halo or celebrity designers. The brands sell affordability and ubiquity, not prestige.

The Mulliez map stretches far beyond trolleys and T‑shirts. Through Boulanger, AFM controls one of France’s major electronics and appliance chains; through Electro Dépôt and Youg’s (before disposals), it extended into discount formats.[page:25] In automotive services, Norauto and Midas Europe handle car repairs and maintenance, locking in another recurring‑revenue segment tied to everyday life.[page:25]

Financial services flow through Oney (formerly Banque Accord), offering consumer credit and payment solutions tailored to the group’s retail chains.[page:25] On the property side, Ceetrus and Nhood manage retail real estate and “retail services management,” turning the family into both landlord and operator for many of the sites where its banners sit.[page:25] Voltalia adds a foothold in energy, while concepts like Agapes Restauration (Flunch, Les 3 Brasseurs) and Cultura (through related holdings) plug the food and culture gaps.[page:25] It is an ecosystem where money moves in loops: from shopper to retailer to lender to landlord — often staying under the AFM umbrella.

Since 2014, AFM has been headed by Barthélemy Guislain, representing a newer generation of family leadership.[page:25] He presides over an association that, by design, is not about one charismatic patriarch but about a structured “family of founders” with rotating roles and a shared doctrine. Articles in French business media describe this as a process where a new generation takes the helm without breaking the pact.[page:25]

Around the core sit dozens of Mulliez relatives and in‑laws, some of them front‑line executives, others quiet shareholders. Side vehicles like Sodival, controlled by a Mulliez son‑in‑law, hold assets such as Cultura, the books‑and‑culture chain.[page:25] Outside ventures — Hugues Mulliez at Telecel Group, for instance — radiate from the same family network.[page:25] Power stays notably opaque: there is no single “Mulliez” on magazine covers, only a cluster of names woven through boards and holding charts.

In a Le Monde profile, journalists described the AFM model as “family communism” — a deliberately collective approach to capitalism where the clan pools capital and spreads rewards across lineages.[page:25] It is a striking phrase for one of France’s richest families, whose fortunes are built on selling cheap goods at scale. But it captures the internal political economy: individual ambition is channeled into new banners and formats, not into leaving the system.[page:25]

For shoppers, the Mulliez presence is almost invisible: they see Auchan, Decathlon, Leroy Merlin or Kiabi, not AFM.[page:25] For mayors, landlords and suppliers, the picture is different. They negotiate not with a single store, but with a sprawling family holding whose businesses anchor jobs and tax bases across Europe. In a continent obsessed with the power of Paris and Brussels, Association Familiale Mulliez is a reminder that some of the most durable influence sits in private family pacts — not parliaments.[page:25]