Investors Exchange (IEX) is a stock exchange in the United States. It was founded in 2012 in order to mitigate the effects of high-frequency trading. IEX was launched as a national securities exchange in September 2016. On October 24, 2017, it received regulatory approval from the U.S. Securities and Exchange Commission (SEC) to list companies. IEX listed its first public company, Interactive Brokers, on October 5, 2018. The exchange said that companies would be able to list for free for the first five years, before a flat annual rate of $50,000. On September 23, 2019, it announced it was leaving its listing business.