Sainsbury's Bank plc, trading as Sainsbury's Bank, is a British bank wholly owned by Sainsbury's, a national supermarket chain in the United Kingdom. The bank began trading on 19 February 1997 as a joint venture between J Sainsbury plc and Bank of Scotland. Sainsbury's took full ownership of the bank in January 2014. The bank's head office is located in Edinburgh, Scotland and its registered office in London, England. In 2017 it had over 2.1 million active customers.