Warren Buffett (Trades, Portfolio)'s investment firm has recently made a notable addition to its diverse portfolio by increasing its stake in Liberty SiriusXM Group (NASDAQ:LSXMA). On January 17, 2024, the firm added 1,203,024 shares of LSXMA at a trade price of $30.43. This transaction has expanded Buffett's total holdings in the company to 22,501,458 shares, reflecting a 0.22% impact on the portfolio and a 6.89% stake in the traded stock.