Key Takeaways
- • The PHLX Semiconductor Index fell 12.25% on Thursday, November 5, 2026, closing at 9,011.14, its second-largest one-day decline on record and largest since March 16, 2020.
- • The iShares Semiconductor ETF (SOXX) dropped 12.15% to $131.90 and the VanEck Semiconductor ETF (SMH) fell 11.21% to $447.73, with both funds still up year to date.
- • Micron fell 17.46%, Lam Research fell 16.36%, and NVIDIA fell 9.26%, with equipment and memory names hit hardest, which the article reads as a possible signal of capex slowdown concerns.
- • By one estimate, chipmakers lost more than $1.5 trillion in market value, out of roughly $3 trillion erased across the S&P 500, and the Nasdaq Composite fell 5.52%.
- • Analysts offered competing explanations: AI regulation concerns after Democrats won Congress, hedge funds locking in gains from crowded winners (per Nomura's Charlie McElligott), and weak results from two chip designers with heavy institutional selling (per Nationwide's Mark Hackett).
Summary
Chip stocks erased roughly $1.5 trillion in market value in a single session on Thursday, November 5, 2026, as the PHLX Semiconductor Index dropped 1,257.52 points, or 12.25%, to 9,011.14 from its Wednesday close of 10,268.65. According to a Reuters markets columnist, it was the second-biggest one-day decline on record and the index's largest drop since March 16, 2020, when it fell 15.90% during the COVID crash. It was also the first close below 10,000 since April 28.
The two largest semiconductor ETFs fell in step. SOXX closed at $131.90, down $18.24, or 12.15%, its worst day since March 2020, while SMH fell $56.54, or 11.21%, to $447.73. Both funds remain positive for 2026, with SOXX up 31.62% and SMH up 24.32% year to date. Over the week through November 5, SOXX lost 22.99% and SMH lost 20.29%. SOXX, which tracks an index of 30 U.S.-listed chip companies, holds $43.89 billion in assets; SMH holds $67.25 billion, with NVIDIA as its top position at 20.57%.
Equipment and memory names led the decline. Micron Technology dropped 17.46% to $656.39, and Lam Research fell 16.36% to $185.20 after an intraday slide of about 36% over the past month. NVIDIA fell a smaller 9.26% to $181.60. The article notes that because chipmaking equipment and memory sales depend on future spending plans, the disproportionate selloff in those names points to investors pricing in a capex slowdown rather than a drop in current orders. The Nasdaq Composite fell 5.52%, its biggest daily decline in 19 months.
The causes remain disputed. Some investors pointed to concerns about tougher AI regulation after Democrats won Congress, including in states where opposition to new data centers has grown. Nomura's Charlie McElligott argued the larger driver was hedge funds selling the year's biggest winners to lock in gains, with weaker fundamentals playing a smaller role. Nationwide's Mark Hackett cited weak results from two chip designers, along with heavy institutional selling and hedge funds reducing borrowing. The article observes that crowded-position selling typically runs its course faster than a genuine demand break, while regulatory concerns can persist longer because new rules take months to draft.
For SOXX holders, the index now sits 38.4% below its June 22 record close of 14,634.72. The article suggests SOXX, with its greater equipment and memory exposure, could rebound harder if capex concerns prove overstated, while SMH's Nvidia weighting has held up better and may capture less of any recovery. Nvidia's earnings report is expected Tuesday, November 17, after the close, though the company has not confirmed the date. A close back above 10,000 following that report would suggest November 5 was mainly position selling, while a close below 9,011.14 would point to a real capex unwind.
The two largest semiconductor ETFs fell in step. SOXX closed at $131.90, down $18.24, or 12.15%, its worst day since March 2020, while SMH fell $56.54, or 11.21%, to $447.73. Both funds remain positive for 2026, with SOXX up 31.62% and SMH up 24.32% year to date. Over the week through November 5, SOXX lost 22.99% and SMH lost 20.29%. SOXX, which tracks an index of 30 U.S.-listed chip companies, holds $43.89 billion in assets; SMH holds $67.25 billion, with NVIDIA as its top position at 20.57%.
Equipment and memory names led the decline. Micron Technology dropped 17.46% to $656.39, and Lam Research fell 16.36% to $185.20 after an intraday slide of about 36% over the past month. NVIDIA fell a smaller 9.26% to $181.60. The article notes that because chipmaking equipment and memory sales depend on future spending plans, the disproportionate selloff in those names points to investors pricing in a capex slowdown rather than a drop in current orders. The Nasdaq Composite fell 5.52%, its biggest daily decline in 19 months.
The causes remain disputed. Some investors pointed to concerns about tougher AI regulation after Democrats won Congress, including in states where opposition to new data centers has grown. Nomura's Charlie McElligott argued the larger driver was hedge funds selling the year's biggest winners to lock in gains, with weaker fundamentals playing a smaller role. Nationwide's Mark Hackett cited weak results from two chip designers, along with heavy institutional selling and hedge funds reducing borrowing. The article observes that crowded-position selling typically runs its course faster than a genuine demand break, while regulatory concerns can persist longer because new rules take months to draft.
For SOXX holders, the index now sits 38.4% below its June 22 record close of 14,634.72. The article suggests SOXX, with its greater equipment and memory exposure, could rebound harder if capex concerns prove overstated, while SMH's Nvidia weighting has held up better and may capture less of any recovery. Nvidia's earnings report is expected Tuesday, November 17, after the close, though the company has not confirmed the date. A close back above 10,000 following that report would suggest November 5 was mainly position selling, while a close below 9,011.14 would point to a real capex unwind.
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