• The Philadelphia Semiconductor Index (SOX) fell 3.6% in early trading, with major chip stocks like Micron, ARM, and Intel (INTC) leading declines.
  • The broad-based sell-off signals a risk-off sentiment in the semiconductor sector, despite recent AI-driven rallies.
  • Declines range from 1.4% for Broadcom (AVGO) to 6.7% for Micron, reflecting widespread pressure across memory, AI, and legacy chip stocks.

The Philadelphia Semiconductor Index (SOX) took a sharp dive in early trading Thursday, falling 3.6% as a wave of selling swept across the sector. Micron Technology (MU) (MU) was the hardest hit, dropping 6.7%, while ARM Holdings (ARM) (ARM) fell 4.6% and Intel (INTC) lost 4.0%. Other notable decliners included Advanced Micro Devices (AMD) (AMD), down 3.5%; Taiwan Semiconductor Manufacturing Co. (TSM), off 3.4%; Marvell Technology (MRVL) (MRVL), sliding 2.7%; and NVIDIA (NVDA) (NVDA), which gave back 2.3%. Broadcom (AVGO) showed relative resilience, dipping just 1.4%.

The sell-off comes as investors reassess the sustainability of AI-driven demand, which had propelled the sector to lofty valuations. “The market is taking a breather after a strong run,” said an analyst at a major investment bank, who spoke on condition of anonymity because they were not authorized to comment publicly. “There’s concern that AI capex may not grow as fast as hoped, and memory prices are still under pressure.”

Micron’s outsized decline reflects ongoing worries about the memory chip cycle, with DRAM and NAND prices facing headwinds from oversupply and weak end-demand in PCs and smartphones. Intel’s slide comes amid continued execution challenges and competitive pressures from AMD and NVIDIA in the data-center market. NVIDIA, despite its AI dominance, was not immune to the broader risk-off mood.

Taiwan Semiconductor, a bellwether for global chip demand, fell in sympathy with the broader index. Marvell and ARM, both with exposure to networking and IP licensing, also suffered as investors rotated out of tech. Broadcom’s smaller decline may reflect its diversified business model, which includes software and infrastructure.

The SOX has been volatile in recent months, driven by shifting expectations around AI adoption and macroeconomic uncertainty. Thursday’s move underscores how quickly sentiment can turn, even in a sector often seen as a long-term growth play. Market participants will be watching for any news on AI capex from major cloud providers or inventory adjustments from chipmakers. Without positive catalysts, the near-term outlook remains cautious.