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Security / ransomware / retail / marks and spencer

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."

By Kiera Fields

Updated Nov 11, 2025 10:17 AM / Published Nov 5, 2025 10:23 AM 3 min read

M&S ransomware costs revealed - "prescient" General Counsel praised — 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.

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Kiera Fields

Kiera Fields is head of special projects at The Stack and was previously at Business Insider. She writes about leadership, tech and business, covering everything from earnings calls to C-suite interviews.