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Top 10 US tech stocks now nearly 40% of S&P 500, highest since 1990s dotcom bubble, UBS urges portfolio rebalancing.

Market News
18 Jun 2026
Proactive Investors
View Source
Neutral
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The top ten US technology stocks now represent nearly 40% of the S&P 500's market capitalization, the highest concentration since the late 1990s dotcom bubble. This surge is driven by giants like Microsoft, Apple, NVIDIA, Amazon, Alphabet, and Meta, with NVIDIA surpassing a $5 trillion market cap. UBS warns that such concentration echoes past market bubbles and corrections, recommending investors rebalance portfolios by diversifying beyond mega-cap tech stocks into other sectors and lesser-known companies. This approach aims to mitigate risks associated with extreme tech stock concentration while still benefiting from growth areas like AI infrastructure and industrial adoption.

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