Like a lot of brokers, we do have prop trading, most of them do it from separate entities so you’d not see them on this list. We have to report margins to the exchange on a daily basis (client and prop), so it is not possible to use client margin for this. Over 25% of total funds lying in the business belongs to the firm, so if you see 9% it means that we are utilizing less than 50% of our own funds.
Check this thread , has answers to your other question