Today's noteworthy initiations include: Sirius XM (SIRI) initiated with an Underweight at Barclays...Rentech Nitrogen (RNF) initiated with an Outperform at Imperial Capital...Digital Realty (DLR) initiated with a Sell at Cantor...DuPont Fabros (DFT) initiated with a Buy at Cantor...CoreSite Realty (COR) initiated with a Buy at Cantor...IBM (IBM) initiated with a Buy at Sterne Agee...Leapfrog (LF) initiated with a Strong Buy at Ascendiant Capital. :theflyonthewall.com