US Stocks Close Mixed as Tech Earnings Week Begins; Dow Falls 307 Points, TSMC ADR Gains Nearly 1%

Wall Street's major indices closed mixed on Monday as investors focused on easing Middle East tensions and anticipated key tech company earnings reports this week. The Dow Jones Industrial Average dropped 307.16 points, or 0.59%, while the S&P 500 fell 0.19% and the Nasdaq Composite slipped 0.05%.

In contrast, the Philadelphia Semiconductor Index rose 0.6%, with TSMC's ADR closing up 0.99% at $402.30. This resilience in chip stocks comes as investors look for clues on AI development from earnings reports expected from Alphabet, Intel, and Tesla this week.

Geopolitical tensions remained a backdrop, with reports indicating ongoing communication between the US and Iran via intermediaries. US President Donald Trump's statement on Truth Social, vowing "multiple times the price" for Iranian actions, contributed to oil price fluctuations.

Individual stock performance varied, with Apple being the largest drag on the S&P 500, falling 2%. Microsoft saw a gain of 2.15%, and Alphabet rose 1.5%. Other chipmakers like Micron and Broadcom gained nearly 2%, while Nvidia and AMD also saw modest increases.