Big tech has never been bigger. The 2 largest S&P 500 companies, Nvidia, $NVDA, and Apple, $AAPL, now account for 15% of the index’s market cap, an all-time high. This comes as $NVDA represents a record 8%, while $AAPL accounts for 7%. By comparison, the combined weight of Exx
Why now
Thesis: Extreme concentration amplifies index vulnerability
Catalyst to watch: NVDA or AAPL earnings miss
Main risk: Concentration unwind hits broad index
Why it matters
Record concentration in two mega-caps raises index fragility if either falters.
Details
Big tech has never been bigger. The 2 largest S&P 500 companies, Nvidia, $NVDA, and Apple, $AAPL, now account for 15% of the index’s market cap, an all-time high. This comes as $NVDA represents a record 8%, while $AAPL accounts for 7%. By comparison, the combined weight of Exxon Mobil, $XOM, and Apple, $AAPL, peaked at ~8% in 2011. During the 2000 Dot-Com Bubble, Microsoft, $MSFT, and General Electric, $GE, topped at ~9% in 1999. Before 2020, the 2 largest stocks never accounted for more than 10% of the index’s market cap. The US equity market has never been this concentrated.
Related assets & topics
NVIDIA · NVDAApple · AAPLExxon Mobil · XOMMicrosoft · MSFTGE Aerospace · GES&P 500 · ^GSPCS&P 500 ETF · SPYSources
- x · 2026-09-26 16:30 UTC