US stocks today: S&P 500, Nasdaq open lower as caution builds ahead of Big Tech earnings

US stocks opened lower on Monday as investors turned cautious ahead of major Big Tech earnings. The S&P 500 fell 0.16 percent to 7497.47 and the Nasdaq Composite dropped 0.56 percent to 25693.72 at the opening bell, while the Dow Jones edged up 0.12 percent to 52287.14. The cautious tone in US tech-heavy indices is likely to weigh on Indian IT stocks and broader market sentiment at open.