Tom Gayner's position in Liberty Media Corp. (Tracking Stock - SiriusXM) Series C is currently worth $20.9 Million. That's 0.29% of their equity portfolio (70th largest holding). Tom Gayner acquired their 522 Thousand shares in Q2 2016. So far they never sold any shares in the company. The stake costed the investor $16.1 Million, netting the investor a gain of 30% so far.