Cybercriminals have stolen private details of potentially millions of Balenciaga, Gucci and Alexander McQueen customers in an April attack on parent company Kering. The stolen data includes names, e-mail addresses, phone numbers, addresses and total spending amounts at luxury stores worldwide. The hacker group Shiny Hunters claims to have data linked to 7.4 million unique e-mail addresses and contacted Kering in June demanding Bitcoin ransom. Kering confirmed the breach, disclosed it to data protection authorities, and e-mailed affected customers. No financial information like card details were stolen. The breach occurred during a wave of attacks on luxury brands including Cartier and Louis Vuitton.