Lessons in Concentration Risk from Norway's $2 Trillion Fund

Norway's Government Pension Fund Global, the world's largest sovereign wealth fund at $2 trillion in assets, has released stress-test results that quantify a risk institutional investors have discussed qualitatively for years: extreme concentration in artificial intelligence equities. The fund's modeling shows an AI valuation correction would erase 53% of its equity portfolio value—more than double the impact of a severe climate shock and exceeding even geopolitical fragmentation scenarios. This analysis arrives as AI-linked stocks represent an unprecedented share of global market capitalization, with the "Magnificent Seven" alone accounting for roughly 30% of the S&P; 500. For institutional allocators, the findings raise fundamental questions about passive indexing, benchmark construction, and the emerging tension between momentum-driven capital flows and prudent diversification.

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