XM Satellite Radio Holdings Inc (XMSR) opened at $13.32. So far today the stock has hit a low of $13.26 and a high of $13.64. XMSR is now trading at $13.51, up $0.31 (2.35%). After hitting a one-year high of $17.70 in January, the stock has been shaky all year as investors await firm news on the planned Sirius (SIRI) merger. The stock has climbed recently as current investor buzz is that the merger looks more likely to succeed. Analysts have said the DOJ could make a ruling on the merger within the next month, and they believe there is better than a 50% chance the merger will b...