Group 1: Soros Fund Management's Investments - Billionaire investor George Soros has significantly increased positions in mega-cap stocks, notably Apple and Amazon, with new investments totaling hundreds of millions of dollars [1][2] - In Q3 2025, Soros Fund Management acquired over 1.843 million shares of Amazon, valued at $404.808 million, resulting in a total holding of $488.803 million, which is a 482% increase from Q2 [1] - The firm also purchased 328,605 shares of Apple worth $84.718 million, raising its total investment in Apple to $89.053 million, reflecting a 1,954% quarter-over-quarter increase [2] - Additionally, Soros Fund Management acquired 631,397 shares of Alphabet, valued at $155.297 million, bringing total holdings to 658,367 shares worth $160.049 million, marking a 2,341% increase from Q2 [2] Group 2: Total Investment and Market Context - Overall, Soros Fund Management invested $644.823 million in Amazon, Apple, and Alphabet within a single quarter [3] - Warren Buffett's Berkshire Hathaway also entered a new position in Alphabet during Q3 2025, purchasing 17.846 million shares valued at $4.93 billion, which constitutes 1.6% of its portfolio [3] - On December 31, 2025, Warren Buffett stepped down as CEO of Berkshire Hathaway, with Greg Abel succeeding him on January 1, 2026, while Buffett remains as chairman [3]