Two handfuls of stocks in the US market constitute more than 30% of the country’s market capitalisation and 18% of the global equity market. This bodes ill for investors should anything go wrong at these companies. 

The mega-cap stocks are Apple, Microsoft, Amazon, Nvidia, both share classes of Google owner Alphabet, Meta Platforms, Berkshire Hathaway, Tesla and UnitedHealth Group. Combined, these 10 stocks are worth more than all the listed equities in China, Canada, Japan, France and the UK combined. ..

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