The following video is from Monday's Investor Beat, in which host Alison Southwick and Motley Fool analysts Lyons George and Taylor Muckerman dissect the hardest-hitting investing stories of the day.

In this segment from Investor Beat, Taylor and Lyons explain why they're keeping a close watch on shares of MarkWest Energy (NYSE:MWE) and Sierra Wireless (NASDAQ:SWIR).

Alison Southwick, Lyons George, and Taylor Muckerman have no position in any stocks mentioned. The Motley Fool recommends and owns shares of Sierra Wireless. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.