On the last day of 2023, Warren Buffett (Trades, Portfolio)'s Berkshire Hathaway made a significant addition to its holdings in Occidental Petroleum Corp (NYSE:OXY), a move that has caught the attention of investors and market analysts alike. The transaction involved the acquisition of 83,858,848 shares, which increased Berkshire Hathaway's total share count in OXY to 327,574,652. This trade, executed at a price of $59.71 per share, had a notable impact of 1.57% on the portfolio, and it adjusted Berkshire's overall position in the company to a commanding 34.00%.