Marks and Spencer $MKS.L, one of the UK’s most prominent retailers, is grappling with the aftermath of a major cyberattack that severely disrupted its online operations for over three weeks. The incident, which began around Easter weekend, has raised significant concerns regarding data security, with personal customer information reportedly stolen during the breach. This breach has led to a sharp decline in the company's stock price, dropping by 15% since the attack first occurred. The retailer, known for its 1,000 stores across the UK, has confirmed that it was targeted by ransomware, a form of malicious software designed to lock computer systems and demand payment for access to be restored.