Technology giant Tata Consultancy Services, a top partner of Marks & Spencer, has said that its systems were not breached as part of a high-profile hack of the retailer.

Marks and Spencer

Independent director Keki Mistry told shareholders that no other customers have been impacted

In Tata Consultancy Services’ (TCS) first public comments since cyber criminals attacked Marks & Spencer over the Easter weekend, independent director Keki Mistry told the annual shareholder meeting that it had not been compromised, Reuters reported.

“As no TCS systems or users were compromised, none of our other customers are impacted,” Mistry said. “The purview of the investigation does not include TCS.”

The attack on M&S led to weeks of disruption, at various times payments and click-and-collect were hit. The retailer had to stop trading online – it resumed earlier this month – and there were also some product availability problems in some stores in the aftermath of the hack.

Marks & Spencer expects the attack to cost it about £300m. It is expected that the hit will be partially covered by insurance.

Marks & Spencer was one of a number of retailers, including the Co-op and Harrods, which were targeted by hackers over a short space of time. 

The Co-op this week launched a special ‘thank you’ promotion for customers for sticking by the retailer when it was targeted, while Morrisons – which suffered following a cyber attack on partner Blue Yonder – reported this week that it has “bounced back”.