Some. Since trader can have multiple accounts. So, some in IBKR, some in ToS and...

edoceo on Oct 3, 2020 | parent | context | favorite | on: Morgan Stanley Closes Acquisition of E*TRADE

Some. Since trader can have multiple accounts. So, some in IBKR, some in ToS and some in RH. It's not binary. Maybe you put all your meme stock gambling in RH for example