Can its new CEO orchestrate a turnaround? Shares of autonomous vacuum cleaner company iRobot (IRBT 3.67%) were up 12.3% during May, according to data provided by S&P Global Market Intelligence. While that was enough to outpace the nearly 5% for the S&P 500, shareholders might still be disappointed with the final outcome of the month considering the stock was up more than 50% at one point. It's hard to pinpoint the biggest factor that sent iRobot up more than 50% in early May but it was possibly the news of ...