Belgian supermarket Colruyt has 104 outlets in FranceGoogle Maps
The agreement includes retaining over 1,300 employees, plus some warehouse staff.
The Belgian firm said it had faced increasingly difficult conditions in France's food retail market.
Despite efforts to improve profitability, its French operations remained unable to generate the scale needed to cover fixed and logistical costs.
Losses have mounted in recent years, with the group reportedly posting a €20million loss for its French arm in the financial year ending March 2025 and some €60million over the last three years in total.
By contrast, Les Mousquetaires is pursuing an aggressive expansion strategy with the aim of capturing 20% of the French market by 2028.