Why iRobot Stock Plunged More Than 19% in September

Shares of consumer robot specialist iRobot (NASDAQ: IRBT), best known for its Roomba robotic vacuum, plunged 19.2% in September, according to data from S&P Global Market Intelligence. For context, the S&P 500 returned 2.1% in the month.

For the year, however, iRobot stock remains a big winner: It's up 83.3% over the one-year period through Oct. 4, leaving in the dust the S&P 500's 20.5% return over this period.

Source: Fool.com