美股“反转”背后：重磅经济数据发布时间确定，12月降息概率跌破50%；孙正义的“OpenAI 炼金术”；巴菲特首次买入谷歌，持仓市值达49亿美元

Group 1 - The U.S. stock market experienced a "V-shaped reversal" on November 14, with significant movements influenced by the upcoming release of key economic data, including the non-farm payroll report and GDP revision [4][8][9] - SoftBank Group reported a net profit of $16.6 billion for the second fiscal quarter, largely attributed to a $14.6 billion increase in OpenAI's valuation, despite the fact that $8 billion of this profit was based on a future investment commitment rather than actual cash outflow [4][13][17] - SoftBank's stock price fell 12.8% over three days following the earnings report, resulting in a market capitalization loss of approximately $26.9 billion [15][17] Group 2 - Warren Buffett's Berkshire Hathaway made its first investment in Google, acquiring nearly 17.85 million shares, which now have a market value of approximately $4.93 billion, making Google the tenth largest holding in the portfolio [31][32] - Bridgewater Associates significantly reduced its holdings in Nvidia by approximately 65.3%, indicating a cautious outlook on the stock's future performance [33] - The overall market sentiment is shifting, with major investment firms adjusting their positions in high-growth tech stocks amid concerns over valuation and economic conditions [33][41] Group 3 - SoftBank's strategy to divest from Nvidia to fund its investment in OpenAI reflects a broader trend of reallocating resources within the tech sector, as companies seek to capitalize on AI opportunities [14][25] - The financial maneuvers involving OpenAI highlight a potential risk of overcommitment, with analysts estimating a funding gap of up to $54.5 billion for SoftBank due to its ambitious investment plans [28][29] - The AI sector is experiencing a cycle of inflated valuations driven by inter-company agreements, which may not translate into actual cash flow, raising concerns about the sustainability of these valuations [24][26]