美股大涨背后推手：万亿美元回购

Group 1 - The core point of the article highlights that U.S. corporate stock buybacks have surpassed $1 trillion at the fastest pace in history, significantly contributing to the record highs of major stock indices like the S&P 500 and Nasdaq [1][4] - Stock buybacks are a method for companies to repurchase their own shares from the market, which can signal positive corporate health and optimize capital structure, ultimately leading to increased earnings per share and higher stock prices [3][4] - The trend of stock buybacks has accelerated this year, particularly among technology and financial giants, with notable announcements including Apple's $100 billion buyback plan and Alphabet's $70 billion plan [3][4] Group 2 - In July, U.S. companies announced a total of $166 billion in stock buybacks, setting a record for the month, and projections suggest that total buybacks for the year could reach $1.3 trillion [4][6] - The S&P 500 companies repurchased $293.5 billion in stock during the first quarter, setting a quarterly record, which helped the index recover from a downturn caused by tariff concerns [4][6] - Despite the bullish sentiment driven by buybacks, there are growing concerns regarding the sustainability of this market rally, with analysts warning about potential economic slowdowns and mixed signals in labor market data [6][7]