 Stocks are falling in afternoon trading with the Nasdaq and S&P 500 down for a third consecutive session as investors weigh a massive IT outage. Tech continues to lag and shares of CrowdStrike are plunging 9% as a massive worldwide IT outage grounded flights and disrupted stock exchanges around the globe following an overnight faulty update by the cybersecurity firm that crippled Microsoft's PC operating systems. Shares of Microsoft are down half a percent.