According to data on the US SEC announcement platform, Buffett's Berkshire company bought over 1.4 million shares of tracking stock LSXMA, which tracks the equity of Sirius XM under the Free Media Group, every day from January 23rd to January 25th, along with LSXMK bought between January 12th and January 17th. Analysts suggest that Berkshire's main logic for betting on these stocks may be to see the trading opportunities behind them.