$Sirius XM (SIRI.US)$ saw financial giants take bullish positions in options two days after the music streaming company ranked as the most-shorted stock.
The stock skyrocketed 13% to$3.515 at 12:35 p.m., building on its rebound from the lowest in more than a decade. That could squeeze speculators betting against the company that saw its total short volume climb 31% to 23.73 million on Monday from the previous trading da...