 Shares of CrowdStrike, a cybersecurity firm, finished down 11% after the company warned its software was the one causing the computer systems to crash. Related to the news, shares of Microsoft lagged initially but rebounded somewhat after the cloud service was restored later in the day. Today, the Dow Jones Industrial Average was down 377 points, close at 40,287, and the S&P 500 Index was down 39 points, close at 5,505.