Santander, which employs 200,000 people including about 20,000 in the UK, confirmed that it had been hacked.
“Following an investigation, we have now confirmed that certain information relating to customers of Santander Chile, Spain and Uruguay, as well as all current and some former Santander employees of the group had been accessed,” it said in a statement issued on 14 May.
“Customer data in all other Santander markets and businesses are not affected.”
At that time Santander apologised for “the concern this will understandably cause” and said it was “proactively contacting affected customers and employees directly.”
“No transactional data, nor any credentials that would allow transactions to take place on accounts are contained in the database, including online banking details and passwords,” it said, adding that its banking systems were unaffected so customers could continue to “transact securely.”