道指开盘跌0.1%，标普500跌0.2%，纳指跌0.4%

Group 1 - Caterpillar's stock fell by 2.3% as the company raised its annual tariff cost expectations [1] - Dell's stock dropped by 7.3% due to Q3 profit forecasts falling short of expectations [1] - Autodesk's stock increased by 11.4% after reporting Q2 earnings that exceeded expectations [1] - SentinelOne's stock rose by 8.8% after the company raised its full-year revenue guidance for fiscal year 2026 [1] - Alibaba's stock gained 7.8% as its cloud business accelerated growth and it developed a more advanced AI chip [1]