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Overview
SOK, the Finnish Cooperative Wholesale Society, is the central company of S Group, Finland's largest retail and service group. S Group runs the supermarket and hypermarket chains S-market, Prisma, Sale and Alepa, as well as service stations, the Sokos department stores, hotels and restaurants, and S-Bank. It is owned by its customers: more than 2.6 million Finns are co-op members. For a brand, S Group is the biggest single route to Finnish shoppers, both in stores and online.
Who is behind S Group and SOK
S Group is made up of regional cooperatives across Finland and SOK Corporation, which they own together. SOK provides the group's central services, such as buying, chain management and strategy, while the regional cooperatives run the stores in their areas. The cooperatives are owned by their co-op members, who are also customers. S Group's purpose is to provide competitive services and benefits to these members in a profitable way.
S Group in numbers
- EUR 15.4 billion in combined net sales in 2025, with an operating profit of EUR 495 million.
- EUR 14.5 billion in retail sales excluding taxes, up 1.5%.
- SOK Corporation's net sales were about EUR 9.7 billion.
- Grocery and non-food retail grew 2.5% to nearly EUR 11 billion, faster than the market.
- A record EUR 558 million in Bonus and other monetary benefits paid to co-op members in 2025, and nearly 112,000 new members joined.
- Nearly EUR 700 million invested in Finland, including stores, vehicle charging and online stores.
Co-op members and Bonus
The S-Etukortti membership card and the Bonus programme are central to how Finns shop at S Group. Co-op members earn Bonus on their purchases across S Group's businesses, which gives them a strong reason to keep coming back. For a brand, this means its products sit in stores and online shops that a large share of Finnish households already use every week.
Online growth and the Prisma.fi marketplace
S Group is investing in e-commerce. Online sales at Prisma.fi and the online grocery store S-kaupat kept growing strongly in 2025, sales at Sokos.fi rose more than 30%, and S Group opened a new online grocery collection centre. The biggest change for brands is that Prisma.fi is becoming a marketplace from autumn 2026, so selected outside sellers can sell directly to Finnish shoppers. Read more on our Prisma.fi Marketplace page.
Logistics behind S Group
S Group's retail logistics are handled by Inex Partners, a wholly owned SOK subsidiary. From its logistics centres in Sipoo and regional terminals, Inex delivers goods from domestic and foreign suppliers to S Group's grocery, home and specialty goods stores across Finland.
How brands can work with S Group
- As a supplier to S Group's store chains, where SOK's central buying and chain management decide which products the chains carry, and goods are delivered through Inex's logistics network.
- As a marketplace seller on Prisma.fi, once accepted into the new curated marketplace.
- Through department stores, by working with Sokos for fashion, beauty and home products.
A brand approaching S Group should be ready with:
- Finnish and Swedish product content and labelling for the Finnish market.
- Complete product data, including GTINs, dimensions, weights and categories.
- EU and Finnish product compliance for the category, with documentation for safety and labelling.
- Competitive pricing, since S Group positions itself on affordable shopping baskets.
- Reliable supply and logistics into Finland, whether into Inex's network or to customers directly for marketplace orders.
Why SOK and S Group matter for brands
S Group reaches most Finnish households through its stores, its membership programme and its growing online shops. With Prisma.fi opening as a marketplace, brands now have a new and faster way to reach those shoppers alongside the traditional supplier route.
How eBrands looks at SOK
eBrands is headquartered in Helsinki and works with brands on marketplaces and retail channels across Europe and North America. If you want to sell in Finland through S Group, as a supplier or on the new Prisma.fi marketplace, we are happy to talk it through.
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