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investing - where to trade online? (Greek citizen)
You will likely need to open an account in another EU country, like a broker operating out of France, Britain or Germany, to get the best options.  If you are comfortable using an english language site and interface, I highly recommend Interactive Brokers as they let you trade in many markets simultaneously, have simple currency conversion, and great tools.  But, they are geared toward active traders so you might be better with a more retail oriented broker if you are new to trading stocks. There are many options.  Here is a list to start with: