Billionaire investor George Soros significantly increased his stakes in mega-cap technology stocks, acquiring over $644 million in Apple, Amazon, and Alphabet during Q3 2025. Soros Fund Management saw remarkable quarter-over-quarter growth in holdings, particularly in Alphabet and Apple. Additionally, Warren Buffett's Berkshire Hathaway initiated a substantial new position in Alphabet, coinciding with Buffett stepping down as CEO at the beginning of 2026.