Spanish supermarket giant Mercadona has reinforced its position as Europe’s most revered retailer, according to the latest NielsenIQ data. So far in 2025, Mercadona customers have spent 37% of their total FMCG budget with the chain — the highest share of wallet across Europe.
The share of wallet indicator reflects the proportion of consumer spending devoted to a retailer, offering a clear measure of customer loyalty beyond market share.
Joining Mercadona in Europe’s top ten is another Spanish retailer, Consum, which ranks tenth with a 22% share. France’s E.Leclerc follows Mercadona with 32.5%, while the UK’s Tesco sits third at 29.2%. The ranking also features Carrefour, Intermarché, Esselunga, Coopérative U, Selex and Edeka.
However, NielsenIQ warns that customer loyalty is weakening as e-commerce and discount retailers fragment the market. Only two of the top ten have grown their share since 2023.