Nicolai Tangen, CEO of Norges Bank Investment Management (NBIM), which manages Norway's $2.3 trillion sovereign wealth fund, has cautioned investors not to anticipate a repeat of the strong gains seen in global markets over the past six months, forecasting "tougher times ahead." This warning follows the fund's record first-half profit of nearly $185 billion, with a 12.95% return, significantly boosted by semiconductor stocks like Samsung, SK Hynix, TSMC, ASML, Intel, and Nvidia. Tangen explicitly stated that investors should not expect similar returns going forward, comparing current market conditions to the speculation before the 1929 crash.

Despite the cautious outlook, Tangen advises against abandoning investment strategies during volatility, emphasizing the importance of long-term and well-diversified approaches. NBIM's strategy involves broad diversification, owning approximately 1.5% of all global companies and 3% of listed European companies, which means it participates in both market upturns and downturns. This approach, while successful in the recent boom, also means the fund is exposed to significant losses if markets fall.

Experts have raised concerns about the fund's exposure. Javier Capape, a sovereign wealth fund specialist, noted Norway's fund is "unusually exposed" with roughly 70% in equities and 30% in bonds. NBIM has conducted stress tests, estimating an AI correction could reduce the fund's value by 18%, or about $432 billion, equivalent to nearly seven years of Norway's energy revenues. Other potential scenarios, like a fragmented global economy or a regional debt crisis, could lead to even larger losses, up to 37% and 32% respectively.

Despite these risks and warnings about an AI-driven stock market bubble, the fund is unlikely to significantly alter its current allocation strategy. Tangen attributes much of the fund's recent "fantastic" equity returns to "luck" and riding an international market wave, acknowledging the concentration risk with the top 10 companies holding one-fifth of the total index value. Columnist Roar Valderhaug praised Tangen for warning the public about potential drops, but also noted that fund leaders have a history of being overly dramatic in their warnings, likening Tangen's recent statements to "crying wolf" or even a "werewolf" warning.