Goldman Sachs' US bankers have been xoslot ordered to disclose their Covid vaccine status ahead of a return to the office.
In a memo seen by the BBC, the investment bank said it was mandatory to do so by 17:00 BST on Thursday.
While it strongly encouraged staff to get a vaccine, it said: "We understand that the choice to get vaccinated is a personal one."
Goldman is hoping to bring US staff back to the office on 14 June, it told employees last month.
The notice, which was first reported by the New York Times, said: "Registering your vaccination status allows us to plan for a safer return to the office for all of our people as we continue to abide by local public health measures."
The bank had said staff in the US could work in the office without a mask if they had been vaccinated.
Its UK employees were also previously told that they should expect to be working on-site from 21 June - the date on which the government hopes to lift legal limits on social contact in England.
It is not clear whether UK workers for the bank have been told to report their vaccine status.