The S&P 500 Index fell 0.4% on Monday from a historic high as investors tracked escalating tensions in the Middle East and awaited upcoming corporate earnings reports [1]. Ten of the 11 sectors in the S&P 500 posted losses, led by the materials and industrial sectors [1]. The energy sector stood out as the only gainer, buoyed by rising oil prices following an exchange of fire between US and Iranian forces in the Persian Gulf on Monday [1]. The clash drove oil prices higher and increased investor caution [1].

The Nasdaq 100 index also declined, falling 0.2% as 10-year Treasury yields stayed near their daily highs, further pressuring technology stocks [1]. The US and Iran exchanged fire in the Persian Gulf on May 4, a development that rattled markets and contributed to the retreat in the S&P 500 from its record high achieved earlier this month [1].

Monday's losses reflect a shift in investor sentiment driven by geopolitical risk and macroeconomic factors. The focus now turns to key earnings reports scheduled to be released in coming days, which could steer market direction amid a tense global backdrop.

Investors will closely monitor developments in the Persian Gulf and central bank policy signals as they evaluate risk across various sectors. Market participants await further clarity on geopolitical dynamics alongside economic data releases and corporate earnings announcements later this week [1].