On Tuesday, June 23, 2026, the stock market experienced a significant "chip-wreck," particularly impacting semiconductor companies that had been driving the year's stock market advance with triple-digit percentage gains. This selloff was triggered by doubts regarding the sustainability of the AI-driven rally. The Philadelphia Semiconductor Index, a closely watched gauge, plunged 7.9%, with all 30 of its members experiencing drops. Companies like Micron Technology Inc., Marvell Technology Inc., and On Semiconductor Corp., each of which had more than doubled in 2026, led this decline.
The rout of tech stocks began in Asia, specifically with Korean chipmakers, and continued into the US trading session, suggesting a global reach. Losses were particularly pronounced in Asia, with South Korea's Kospi plummeting 10% from its record high, marking its sharpest one-day drop since March. The Nasdaq 100 also fell significantly, dropping 3.3%, while the S&P 500 declined 1.4%, and the Dow Jones Industrial Average lost 0.09%.
This widespread selloff ignited fears of an artificial intelligence bubble in the stock market. While no one can definitively confirm an AI bubble, the severe decline in several technology giants served as the latest trigger for concern that the AI frenzy powering the equity bull market might be overblown. Analysts are now cautioning about the risk of renewed volatility, highlighting market instability when movements are so rapid, in either direction, as noted by Michael McCarthy, market analyst at Moomoo Securities Australia. The concern extends to rising debt-funded AI spending and speculation about the Federal Reserve potentially adopting a more hawkish stance.
