Forex brokers in Greece are overseen by both the EU regulator known as the European Securities and Markets Authority (ESMA), as well as the national regulator Hellenic Capital Market Commission (HCMC). Because of this, forex brokers in Greece are limited by the same restrictions as brokers in other EU countries when it comes to things like trading leverage and negative balance protection mechanisms for forex and CFD traders.
In addition to overseeing and licensing forex brokers in Greece, HCMC is also responsible for overseeing the broader financial markets in Greece, as well as companies listed on the Athens Stock Exchange.
Still, many forex brokers from other European countries also offer their services to Greek forex traders. There is no requirement for a forex broker to be regulated in Greece in order to serve the market there, and the regulator will accept forex broker licenses from any other EU member state.