Shares of XM (NASDAQ:XMSR) and Sirius (NASDAQ:SIRI) have been gaining ground lately. Will shares rise even higher or have investors missed out? Will the merger happen? What would it mean for investors? In this installment of Missing Out, I ask Motley Fool senior analyst Rick Munarriz.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.