Credit Suisse has asked its employees to avoid discussions around Britain's EU referendum.
The Swiss lender has issued guidance telling staff not to attend or arrange client events where a so-called Brexit may be discussed, and not to talk about the issue in public.
The memo was sent out by chief financial officer David Mathers and Adrian Ratcliffe, general counsel for global markets in Europe.
First reported by Bloomberg, the guidance said: “Examples of potentially restricted activity include issuing advertisements or communications directly to the public relating to the referendum.”
Employees have been asked to “ensure that [they do] not engage in activities that are intended to promote or bring about particular outcome in the referendum”.
Staff are also forbidden from arranging client events were the referendum “is on the agenda or may be raised in questions and answers”.
It emerged last month that the Bank of America had banned its staff from using the word Brexit during discussions with clients.