The conglomerate's next CEO will have massive shoes to fill.Berkshire Hathaway (BRK.A -0.55%) (BRK.B -0.59%) was once an ordinary textile maker before Warren Buffett took over the company in 1965 and grew it into a massive conglomerate. Along the way, he generated truly remarkable gains for its long-term investors. Over those decades, its stock surged by just over 5,520,000% through the end of 2024, while the total returns from the benchmark S&P 500 (including reinvested dividends) were about 39,000%.Under ...