When you see JPM on the shareholder list, it's not the bank JPM owning the shares, they are the clearer or prime broker of a number of funds who will use CFD's to avoid certain taxes for the fund. In this way, JPM comes up as beneficial owner when they almost certainly aren't.
They seem to be significantly more profitable than other brokers and they operate in quite a few countries. Apparently only 4% of people visiting their site are from the UK. Despite that, their App is downloaded more often than IG markets.
Their churn rate is also ridiculously high which probably explains the profitability....mugging customers tends not to draw repeat business... HOWEVER, they are generating money absurdly quick