The following video is from Tuesday's Investor Beat, in which host Chris Hill and analysts Jason Moser and Matt Koppenheffer dissect the hardest-hitting investing stories of the day.

Alcoa (NYSE:AA) reports a mixed bag of earnings. Barnes & Noble (NYSE:BKS) needs to find a new CEO. IBM (NYSE:IBM) gets a downgrade. And Intuitive Surgical (NASDAQ:ISRG) falls on a lowered forecast. In this installment of Investor Beat, Jason and Matt discuss four stocks making big moves today.

The relevant video segment can be found between 2:29 and 5:32.

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