The S Group (Finnish: S-ryhmä, Swedish: S-gruppen) is a Finnish retailing cooperative organisation with its head office in Helsinki. Founded in 1904, it consists of 19 regional cooperatives operating all around Finland in addition to SOK, Suomen Osuuskauppojen Keskuskunta (The Central Finnish Cooperative Society). S Group operates in the markets for groceries, consumer durables, service station, hotel and restaurant services. It is engaged in close competition with Kesko, with which it shares an oligopolistic position in many of the markets it operates in.
The organisation's member (loyalty) card is called S-Etukortti.
The S Group operates five distinct chains of supermarkets:
Sale – a chain of small grocery stores, mainly located in the countryside
Alepa – this is the equivalent for Sale in the Greater Helsinki region – there are about 110 Alepa stores in Helsinki and the neighbouring cities.
S-market – larger supermarkets with a better selection of goods for sale, and often providing additional services. This is the largest of the S Group's supermarket chains, with nearly 400 stores around Finland.
Prisma – a hypermarket chain with about 90 stores around Finland, Estonia, and Russia in major cities. Formerly, the chain also operated in Latvia and Lithuania.
Food Market Herkku - premier food market operating in the Finnish metropolitan area