All of them
Just kidding, you are probably a newbie and it is good that you are asking this question first when you assess your potential broker. However, you should know that ActivTrades is a broker with more than 20 years experience in the industry and they have a robust regulation status, having licences from many different financial authorities from all around the world.
They enjoy a reputation as one of the most trustworthy brokers out there.
As for regulation, they have: FCA (UK), CSSF (Luxembourg), SCB (Bahamas), CMVM & CONSOB (Italy), CMVM (Portugal), and BACEN (Brasil).