Warren Buffett acquired 20.2 Million Liberty Media Corp. (Tracking Stock - SiriusXM) Series A shares worth $830 Million. That's 0.25% of their equity portfolio (30th largest holding). The investor owns 3.46% of the outstanding Liberty Media Corp. (Tracking Stock - SiriusXM) Series A stock. The first Liberty Media Corp. (Tracking Stock - SiriusXM) Series A trade was made in Q2 2016. Since then Warren Buffett bought shares ten more times and sold shares on two occasions. The stake costed the investor $755 Million, netting the investor a gain of 10% so far.