The AI-fueled rally in semiconductor stocks has officially reversed. The Philadelphia Semiconductor Index, known as the SOX, has fallen more than 20% from its late June peak, confirming a bear market. This marks its worst weekly performance since early 2025.
The downturn follows a spectacular three-month surge where the SOX had gained over 105%. Memory chip makers like Kioxia and SanDisk were among the biggest winners, with some shares still up roughly 600% for the year even after the recent pullback.
Investors are now questioning the sustainability of the AI capital expenditure boom. The sell-off reflects both inevitable profit-taking and deeper concerns about whether massive infrastructure spending by hyperscalers will generate the modeled returns.
The pressure spread globally. South Korea's KOSPI and Japan's Nikkei indices also fell into bear market territory, accelerating risk-off sentiment.
The crypto market felt the tremors immediately. Bitcoin dropped to around $63,000, with traders watching key support near $60,000. AI-focused crypto tokens like FET, RENDER, and TAO experienced significant volatility. These assets carry a double exposure: they track broader crypto sentiment and are leveraged to the same AI narrative driving semiconductor stocks.
The sell-off is a stress test for the entire AI investment thesis. While the long-term technology potential remains, the market is recalibrating expectations for timing and valuation. For investors, the correlation between the semiconductor index and crypto means a sustained downturn in chips would likely maintain pressure on digital assets.