Deutsche Bank says it is reviewing whether to relocate parts of its UK operations to Germany if Britain leaves the EU.
The bank has set up a working group to look at its options.
British Prime Minister David Cameron has promised an in-out referendum on EU membership by 2017.
But calls are now growing for him to hold it as early as next year.
Danny Cox of stockbroker Hargreaves Lansdown says Deutsche is a significant employer in Britain.
IN: "Deutsche...
OUT: ...later."
DUR: 28 seconds