In the following video, Motley Fool analyst Blake Bos looks at several key insiders in major companies, to find out which have been increasing their positions in their own companies over the past 30 days, and which have been selling off. He notes that there has been more than 2.5 times more selling than buying, gives investors a list of the companies being bought or sold by key executives within the company, and reminds investors why internal ownership can be such an important metric to keep an eye on.