When you say "big banks" you're actually crossing several regulatory domains. But as an example, here's the FINRA page on what they won't allow: https://www.fin

When you say "big banks" you're actually crossing several regulatory domains. But as an example, here's the FINRA page on what they won't allow: https://www.finra.org/rules-guidance/guidance/eligibility-requirements https://www.finra.org/rules-guidance/guidance/eligibility-re... FINRA (Financial Industry Regulatory Authority) is the public face of the USA's "Securities and Exchange Commission". They write the rulebook on who gets to work in the industry (stockbrokers, investment bankers, and the like).