Turnover of grocery stores in Belgium 2016, by type 

The source adds the following information:
F1: Large distribution/hypermarket: Carrefour Hyper, Carrefour Market, Carrefour Market by Mestdagh, Colruyt, Delhaize Supermarket, Match and Cora.
F2: Average size distribution supermarkets: Carrefour Market (Franchise), Spar Retail (Retail Partners Colruyt Group), Okay, AD Delhaize, Proxy Delhaize, Intermarché, Smatch and other supermarkets from 400m². It excludes hypermarkets and hard discounters, such as Aldi and Lidl.
Hard discount: Lidl and Aldi.
F3: Small distribution: All self service shops with a selling surface of less than 400m² (e.g. Spar (Retail Partners Colruyt Group), Carrefour Express, Supra et Spar (Lambrechts), Louis Delhaize (Louis Delhaize Group) not included above), and all shops with a “traditional service” (e.g. night-shops”).