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NYSE:CME News 21 December 2025

Tokyo Stock Exchange Outlook (Dec. 21, 2025): Nikkei 225 Futures Jump After BOJ Hike as IPOs, New TOPIX Indices and AI Tools Shape 2026

Tokyo Stock Exchange Outlook (Dec. 21, 2025): Nikkei 225 Futures Jump After BOJ Hike as IPOs, New TOPIX Indices and AI Tools Shape 2026

TOKYO — As Japan heads into the final full week of trading before year-end holidays, the Tokyo Stock Exchange (TSE) is balancing three big forces at once: a higher-rate era after the Bank of Japan’s latest hike, fresh volatility tied to global AI enthusiasm (and occasional panic), and a steady drumbeat of market-structure changes—from IPO mechanics to new indices and…
21 December 2025
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Stock Market Today

  • U.S. Stock Market Faces Concentration Risk Despite Diversification Efforts
    January 31, 2026, 1:11 PM EST. U.S. stock market diversification faces challenges as tech giants like Nvidia, Apple, Microsoft, and Alphabet dominate returns. These companies hold over 26% of the S&P 500 index, causing market concentration to rise sharply. Vanguard and other index funds are now legally classified as nondiversified due to these weightings. This shift highlights a growing 'nondiversification risk' for investors who believed broad index funds offered protection by spreading risk. Regulatory changes since 2019 have acknowledged this trend as tech firms' valuations soared, driven partly by enthusiasm for artificial intelligence. Investors are urged to reevaluate their assumptions about market risk and diversification amid this concentration.
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