There are forex brokerage companies scattered all around the world. Some forex brokers are regulated by government agencies, others by industry self-regulatory organizations, and others again are not regulated at all. Which one you should choose depends on your own personal taste and preference. However, learning about what characterizes the different jurisdictions that forex brokers operate in is a good start no matter what you end up with.
Some of the forex brokers on this list may be there because they do not disclose on their website where their registered office is. There may be many reasons for this, for example that the broker is not authorized to operate in its home country, or that the broker is in the process of moving from one country to another. Other brokers may have more dubious reasons for not disclosing where they are operating.