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Russ Greene highlights that Apple, Microsoft, Nvidia, Alphabet, Meta, and Amazon have a combined market value of $21 trillion.
According to Greene, this total exceeds the entire combined stock market value of all European stock markets.
Greene has previously examined the impact of local data center opposition on potential tax revenue in certain U.S. regions, noting community and economic concerns in a prior article. He has also reported that April 2025 saw high demand and backlogs for gas turbines, as a few companies dominated the market mainly due to AI-related factors, according to a separate note. These observations add further context to his recent market valuations comparison.