Morgan StanleyEfforts are being intensified to ensure that employees comply with their vaccination requirements for re-entry into the office.

According to an internal memo, employees of the company used to only need to state that they had been vaccinated, but now they need to provide proof of vaccination by October 1. The additional measures are intended to make "people who work in the office feel more at ease," the memo said.

After Morgan Stanley introduced the policy in June, nearly 90 per cent of the bank's employees (nearly 95 per cent in New York) pledged that they had been vaccinated. In recent weeks, Wall Street firms have adjusted their rules or stepped up enforcement as a highly contagious variant of delta has spread.

Although Morgan Stanley has not set a final date for the company's return to the office, James Gorman, chief executive, said at a meeting in June that he would be "disappointed" if people did not come back by International Labour Day in September.

Since then, the spread of the Delta variant and the slower-than-expected rate of public vaccination have complicated efforts to get more people back to the office, according to the memo.

"in the coming weeks, we will continue to assess the best and safest way to get most employees back to the office, recognising that this step may take longer than we originally expected," the bank said.