http://blogs.wsj.com/marketbeat/2012/08/02/knight-capital-trading-error-cost-firm-440-million/ http://blogs.wsj.com/marketbeat/2012/08/02/knight-capital-tr...

http://blogs.wsj.com/marketbeat/2012/08/02/knight-capital-trading-error-cost-firm-440-million/ http://blogs.wsj.com/marketbeat/2012/08/02/knight-capital-tr... Basically, they deployed a new HFT algo and it started buying high and selling low. oops!