iRobot (IRBT) stock continues to be on the move, up 21% on Friday and while it was up 9% in pre-market trading Monday, it has since dipped about 5% in early trading today. Investors took interest after the Trump administration signaled support to advance the domestic robot industry—music to the ears of investors of iRobot, which makes robotic vacuums and other cleaning robots. However, there may be another factor in play: nearly 40% of IRBT stock is sold short, setting the stage for a potential short sque ...