Following a cyber attack that disrupted payments and led to bare shelves, Co-op is offering its members £10 off when they spend £40 or more as a gesture of gratitude.
In May, a significant cyber attack impacted the Co-op's stock availability, resulting in empty shelves for shoppers as the disruption continued.
The attack also resulted in hackers stealing members' personal data, including names and contact information.
The Co-op was just one of a number of retailers and other firms to have been hit by a raft of cyber attacks striking the sector in recent months.
Marks & Spencer was forced to halt all online orders after a cyber incident in April, which bosses have said was likely to cost the business around £300 million, while Harrods was also hit.
The convenience retailer announced the “thank you” as its 2,300 food stores returned to usual trading, with all marketing activity resuming including a new national summer advertising campaign.
The offer, to “express gratitude” to the grocer’s six and a half million members who supported the business during the attack, provides 25% off a £40 in-store shop.
The offer, which can be used by members once, takes effect from June 18 and runs until midnight on June 24.
The deal will also be available to new members.
Co-op managing director of food Matt Hood said: “I’m very proud that, thanks to the work of our colleagues, we are very near to making a full and complete recovery from the recent cyber-attack on our Co-op, and I’m delighted to see our stores looking back to normal and being able to serve our shoppers and communities.
“We are so grateful to our member owners for their support and patience with us during what was a very difficult time and hope this gesture of appreciation goes a little way to showing them our thanks, with more value rewards to come over the summer.”
