IEX Group is a financial technology company that operates a stock exchange. The company was founded in 2012 with the goal of creating a fairer and more transparent stock market. IEX is known for its unique approach to trading, which includes a 350-microsecond delay on all orders to prevent high-frequency traders from gaining an unfair advantage. The company has been featured in Michael Lewis' book 'Flash Boys' and has gained a reputation as a champion for small investors.