YouTube/Marcus by Goldman Sachs Goldman Sachs is revamping GS Bank, its online retail banking service. GS Bank will be rebranded as "Marcus by Goldman Sachs," and offer a new mobile experience for users, according to an email sent out to customers by the US Bank. Goldman Sachs is revamping GS Bank, its retail online bank aimed at Main Street. The US bank sent an email to customers of GS Bank Thursday, saying the bank was rebranding the service to "Marcus by Goldman," was improving the "mobile experience," and would soon roll out tools to "improve your financial wellness." The bank is also rolling out a chat function where users can communicate with "savings specialists." "Our brand name change and website enhancements will be ready in December," the bank wrote in the email alert.