Following on from remonstrations on Wall Street in September, 11 people were arrested when they blocked entrances to the San Francisco-based headquarters of the lender.
After being handed a court appearance order, the individuals rejoined other protestors - taking the overall number to about 200 - in front of the institute.
An employee of the bank, who wished to remain anonymous, said it is wrong that a corporate executive at the lender can make millions of dollars, while at the same time so many people are struggling to make ends meet.
She added: "If I didn't have to go to work, I would be out there."
A number of groups were involved in the demonstrations against the bank - which has been in operation for more than 150 years - including the California Partnership, Causa Justa Just Cause, United Here Local 2850, the Chinese Progressive Association and Young Workers United.
By Tony Aynsley