Sizzling semiconductor trade at risk of cooling - and stalling US stocks rally

• Semiconductor stocks now comprise 18% of the S&P 500's weighting, with semis and memory stocks accounting for 70% of the index's $5.1 trillion market cap gain in 2026 through Monday
• Worldwide semiconductor revenue is expected to rise 64% to $1.3 trillion this year, with S&P 500 semis companies projected to grow earnings by 95%, up from 62% expected at year-start
• The SOX index's relative strength index hit 85.5 on Friday, its most 'overbought' reading since the March 2000 tech bubble peak, while investor Michael Burry disclosed bearish bets on a semis ETF

Market Summary: Semiconductor Rally Raises Concerns About Sustainability

The Philadelphia SE Semiconductor Index has surged 64% since March 30, significantly outpacing the S&P 500's 17% gain, but analysts warn the rally may be overheating and could threaten broader market stability.

Key Performance Data

Major semiconductor stocks have posted exceptional gains during this period:

• Micron and Advanced Micro Devices: doubled in value
• Intel: nearly tripled
• Semiconductor stocks now comprise 18% of S&P 500 weighting

Gains in semis and memory stocks accounted for 70% of the $5.1 trillion in market capitalization added by the S&P 500 in 2026. Worldwide semiconductor revenue is projected to rise 64% to $1.3 trillion this year, according to Gartner, with S&P 500 semiconductor companies expected to increase earnings by 95%.

Market Drivers

The AI infrastructure buildout is fueling massive capital spending on data centers, driving demand beyond industry leader Nvidia to include companies like Sandisk and Western Digital. The multi-year capital expenditure cycle is creating strong fundamental support for the sector.

Warning Signs

Technical indicators suggest the trade may be overextended:

• The relative strength index hit 85.5 on Friday, the most "overbought" reading since the tech-bubble peak in March 2000
• Barely over half of S&P 500 stocks are above their 50-day moving averages despite the index hitting all-time highs
• Notable investor Michael Burry reportedly holds bearish bets on semiconductor ETFs
• Chase Investment Counsel sold its Qualcomm position Monday, citing concerns about "parabolic moves"

Analysts caution that semiconductors' substantial weighting means any correction poses significant risk to the broader market rally.