The Co-op has admitted to unlawfully blocking more than 100 rival supermarkets from opening branches near to its stores.

The UK’s competition watchdog found Co-op had breached an order which limits supermarkets’ ability to prevent nearby land being used by rival retailers.

Blocking other grocers from opening nearby hits competition between supermarkets and means shoppers have less choice when trying to get cheaper prices, the Competition and Markets Authority (CMA) said.

A spokesperson for Co-op, said: “This is a matter we take very seriously, and we have taken all necessary action to ensure this issue is resolved and does not happen again.”

The Co-op admitted 107 breaches of the Groceries Market Investigation (Controlled Land) Order 2010. It has re-written 104 agreements and agreed to resolve three others, the CMA said. It released a list of the 107 locations.

The Co-op’s spokesperson added: “As a business that is committed to operating fairly, we recognise this is extremely disappointing.”

The Co-op owns almost 2,400 stores across the UK and holds a 5.2% market share in the UK’s £190.9bn supermarket industry, according to the CMA.

The chain said the number of breaches amounted to “less than 2% of transactions” across its property portfolio, which includes its supermarkets and funeral directors.

Many of the UK’s biggest supermarkets have also breached the land order in recent years, but not to the extent that Co-op was found to in the CMA’s latest action.

• Tesco 23 breaches in 2020
• Waitrose 7 breaches in 2022
• Sainsbury’s 18 breaches in 2023
• Asda 14 breaches in 2023
• Morrisons 55 breaches in 2023
• Marks and Spencer 10 breaches in 2023

Daniel Turnbull, senior director of markets at the CMA said: “Restrictive agreements by our leading retailers affect competition between supermarkets and impact shoppers trying to get the best deals.”

The order bans new restrictive covenants which prohibit land being used for a supermarket.

It also bans exclusivity arrangements which prevent landlords from allowing stores to compete with an existing supermarket which were over five years long.