滚动更新丨美股三大股指集体低开，亚马逊跌逾7%

Group 1 - Amazon's stock dropped over 7% due to lower-than-expected guidance for Q3 operating profit and underperformance of its AWS business compared to Microsoft and Google [1][7] - Apple's stock rose over 1% as its Q3 earnings exceeded expectations [1] - Reddit's stock increased by over 12% following a better-than-expected revenue forecast for Q3 [1] Group 2 - Major U.S. stock indices opened lower, with the Dow Jones down 0.84%, Nasdaq down 1.38%, and S&P 500 down 0.95% [1][2] - European stock indices also experienced declines, with Germany's DAX down 2.17%, France's CAC40 down 2.39%, and the UK's FTSE 100 down 0.68% [5][6] Group 3 - The U.S. non-farm payrolls increased by 73,000 in July, down from a previous increase of 147,000 [9] - The dollar index experienced a sharp decline, dropping over 80 points to 99.4, a decrease of 0.6% [8] Group 4 - OpenAI has raised $8.3 billion, achieving a valuation of $300 billion, with investors including Blackstone Group and TPG [11]