Honestly I wouldn’t expect anything to happen. At my company and all previous ones, everyone knows our CEO would never legitimately email or DM us on slack to ask us to real quick wire a few thousand/million/billion to the Caymans, or buy BTC, and he doesn’t have some global root on our servers either. Even people who have more technical access don’t tend to stay logged into elevated production accounts except at the exact time it’s needed.

Jamie Dimon does not have credentials to log into back office systems at JPMS. I’d be surprised if he even had access to execute wire/asset transfers via front-end tools.

Best a hacker could probably achieve is sending some sketchy emails or messages, but even there people are just going to confirm by verbally communicating with him.

Banks are actually the worst analogy for this sort of thing because there is a ridiculous amount of system federation and ultra-conservative system controls. It can take a month to get a simple route or firewall port opened on controlled networks (god I hate change committees).