Escalating geopolitical risks in the Middle East and growing market anxiety over returns from artificial intelligence (AI) investments sent the US technology sector into a sharp decline on the 23rd. The Magnificent 7 index, a core pillar of the US stock market, plummeted 4.8% in a single day, erasing a staggering $797 billion in market value. This marks the largest one-day drop since April 2025.
The wave of tech selling dragged down all three major New York stock indexes, causing a notable correction. By the close of trading on the 23rd, the S&P 500 fell 1.2%, the tech-heavy Nasdaq 100 dropped sharply by 1.9%, and the Philadelphia Semiconductor Index also dipped 0.5%.
The immediate catalysts for this dramatic tech sell-off were the latest quarterly reports and capital expenditure plans released by major tech companies. Alphabet Inc., the parent company of Google, raised its full-year capital expenditure forecast for 2026 to as high as $205 billion. Meanwhile, Tesla Inc. reported second-quarter profits that fell far short of expectations, and CEO Elon Musk confirmed this year would be a "big year for capital spending." Consequently, Tesla shares plunged 15% on the day, their worst single-day performance since March 2025. Alphabet Inc. shares were heavily hit, dropping 7.1%. Additionally, shares of Microsoft Corporation, Amazon.com Inc., and Meta Platforms Inc., which are set to report earnings next week, fell 2.2%, 4.6%, and 3.4%, respectively.
Market analysts pointed out that the contradiction between aggressive investments in AI infrastructure by US tech giants and the uncertain timeline for realising returns is becoming increasingly apparent. Ken Mahoney, CEO of Mahoney Asset Management, stated that continuous massive capital outlays coupled with the difficulty in determining investment returns have become core factors fuelling anxiety in capital markets. Simultaneously, macro headwinds, such as rising international oil prices due to the escalating US-Iran conflict, further intensified the downward pressure on the tech sector.
According to data, the Magnificent 7 index has now fallen 11% from its all-time high set in late May this year, with cumulative market value losses reaching $2 trillion. Analysts generally believe that as tech giants enter a high-stakes phase of computing power competition and elevated capital spending, the secondary market is scrutinising the "high spending for market share" model more strictly. The tech sector is likely to continue facing valuation corrections and heightened volatility in the near term.