Trading bots use algorithms that execute trades when certain market conditions are met. Since the early 2000s there has been strong growth in these bots especially as market data has become more ...

Other commentators peg the volume of stock trades coming from bots at 60% to 70%. Institutional traders rent or create their own bots that activate when the market hits certain conditions.

Planet Money built a stock trading Twitter bot. The big puzzle is figuring out which company to buy or sell, and how to get a computer to tell the difference between Apple the company and the fruit.