The following video is a segment from Wednesday's Energy Roundup, in which Motley Fool energy analysts Joel South and Taylor Muckerman dig deep into the biggest stories facing energy investors today.

In this segment, Joel tells investors about hedge fund and activist investor Bill Ackman's recent purchase of a 9.8% stake in Air Products & Chemicals (APD 0.72%) and why at this valuation the purchase was a little unusual.