City Index was originally founded in 1983, it began operations as a spread betting brokerage located out of the UK; in 2001, it added CFD trading.
In 2005, it was acquired the IXF Group and its two established brands, IFX Markets and Finspreads.com; in 2008, FX Solutions was acquired.
In 2014, it was acquired by Gain Capital, an NYSE-listed firm. Today the broker is home to over 150,000 retail accounts and $978 million in client assets as of its 2018 financial year-end. It is also regulated across eight different jurisdictions making it one of the most well-established and trustworthy brokerages in operation today.