Security M&S ransomware costs revealed - "prescient" General Counsel praised "They didn’t just rock up and say ‘Would you change my password?’ They appeared as an individual, with their details." Kiera Fields Nov 05, 2025 - 3 min read Image credit: https://unsplash.com/@a_r_shots A ransomware attack on high street retailer Marks and Spencers (M&S) cost it £136 million to respond to – and £324 million in lost sales. Get the full story: Subscribe for free Join peers managing over $100 billion in annual IT spend and subscribe to unlock full access to The Stack’s analysis and events. Subscribe now Already a member? Sign in