The U.K.’s data protection regulator has fined Yahoo’s U.K. division £250,000 (U.S. $331,203) following a cyber-attack in November 2014 that placed the personal information of over 500 million users at risk.

Neil Hodge is a freelance business journalist and photographer based in Nottingham, United Kingdom. He writes on insurance and risk management, corporate governance, internal audit, compliance, and legal...