XTX Markets Limited is a British algorithmic trading company based in London. It was founded in January 2015 by Alexander Gerko, who is currently co-CEO alongside Hans Buehler. The company employs 190 people globally and uses algorithms to trade the difference in market prices across a variety of venues.

The foreign exchange market is a global decentralized or over-the-counter (OTC) market for the trading of currencies. This market determines foreign exchange rates for every currency. It includes all aspects of buying, selling and exchanging currencies at current or determined prices. In terms of trading volume, it is by far the largest market in the world, followed by the credit market.