As noted on November 21, 2012, Liberty Media Corp's purchase was done indirectly through "Through Wholly Owned Subsidiaries" over 2 transactions from November 19, 2012 to November 20, 2012. The share price ranged from $2.71 to $2.74 according to the regulatory filing detailing the transactions.
If we look over the past 12 months, Liberty Media Corp has sold no shares of Sirius Xm Radio Inc stock. Over the same time period, Liberty Media Corp has purchased 8,120,000 shares of Sirius Xm Radio Inc, with a total cost of $22,250,200.
Let's take a quick, high-level look at insider trading at Sirius Xm Radio Inc over the past 12 months. A total of 135,563,195 shares of Sirius Xm Radio Inc stock was sold by insiders, totaling $316,081,055. Over the same time 12 month time period, 310,657,099 shares of Sirius Xm Radio Inc, for a total value of $761,280,550 were purchased by company insiders.
To view the complete SEC Filing: Sirius Xm Radio Inc Form 4 (Insider Trading) SEC Filing