International Stock Brokers. Tuesday, February 21st, 2017. This list reviews the best online brokers for trading internationally in 2017. To qualify, online brokers must be based in the United States, regulated by the United States, and offer international investors outside of the United States access to trading US securities. Before choosing a brokerage, make sure to check directly with the broker and confirm they support your country of residence. As an example, here is a list of the international countries that Firstrade currently accepts new customers from: Australia, Belgium, China, France, Germany, Hong Kong, Ireland, Israel, Italy, Japan, Republic Of Korea, Macau, Mexico, New Zealand, Poland, Spain, Taiwan (Province of China), United Kingdom, and the United States. If you live in any of these countries, Firstrade will allow you to open a brokerage account online and invest in US securities including stocks and options. Currently, there are only select US online equity brokers th...