The Financial Conduct Authority of Britain has warned that Olsson Capital is not regulated.
Olsson Capital is a broker that offers trading with cryptocurrencies and CFDs on Forex, commodities, stocks and other underlying assets.
The broker says it is based in Bulgaria, however the phone number leads to Great Britain, so it obviously is targeting British residents among others.
But the FCA has warned that Olsson Capital has no authorization to provide investment services in the UK (nor in any other country that regulates financial trading).
For your trading you should chose regulated brokers only.