A growing sense of caution is spreading across the investment community as a record percentage of fund managers now see stocks as overvalued. Even as equity markets, particularly in the U.S., continue to press all-time highs, the tension between optimism and concern is shaping portfolio strategies worldwide.

Concern at Historic Highs: Fund Manager Survey Findings

According to the latest Bank of America Global Fund Manager Survey, nearly 80% of asset managers now classify global equities as overvalued—a dramatic increase compared to historical averages of around 30% from a decade ago. This figure is the highest since the survey began in the late 1990s, reflecting mounting anxiety over sustained stock price expansion in the face of middling corporate earnings growth and potentially tightening central bank policies.

Michael Hartnett, chief investment strategist at Bank of America, states, “We have not seen sentiment this mixed since the late 1990s tech boom. Managers are positioned aggressively in stocks even as they warn of stretched valuations. There is an uneasy reliance on momentum, driven by the mega-cap stocks and the ongoing AI revolution.”

Market Backdrop: Bullish Momentum and Narrow Leadership

After a remarkable rally, the S&P 500 and Nasdaq Composite both sit within striking distance of all-time records in September 2025. The S&P 500 has climbed over 12% year-to-date, while the tech-heavy Nasdaq is up 18%—thanks in large part to outsized gains among mega-cap giants including Apple, Microsoft, Nvidia, Alphabet, and Amazon. These “Magnificent Seven” stocks now comprise over 30% of total S&P 500 market capitalization, raising concerns among professionals about market breadth and the vulnerability to sharp reversals.

Data from FactSet highlights that earnings growth for the broader S&P 500 lags the index’s price appreciation, with Q2 2025 earnings showing only modest 3% year-over-year growth—compared to 8% average annual increases in the decade prior to the pandemic. The disconnect has prompted comparisons to previous market bubbles, including the late-1990s dot-com era.

Central Banks and Interest Rate Uncertainty

The Federal Reserve’s prolonged pause on rate hikes in 2025, along with hints of possible future easing, has helped fuel investor appetite for risk assets. However, with inflation remaining sticky at just above 3% and labor markets sending mixed signals, investors are increasingly nervous about the possibility of an unexpected shift in central bank policy.

Recent minutes from the July FOMC meeting underscore the Fed’s data-dependent approach, with policymakers expressing concern that premature easing could reignite inflation. Meanwhile, the European Central Bank and Bank of Japan are grappling with their own inflation and currency challenges, contributing to cross-asset volatility.

“We are effectively in a standoff,” notes Liz Ann Sonders, chief investment strategist at Charles Schwab. “The market is betting on soft-landing scenarios and eventual rate cuts, but the path is far from clear. This is not a time for complacency.”

Investment Sentiment: Defensive Rotations and Hedging Rise

Despite mounting valuation concerns, the latest survey data shows that institutional investors have increased their equity allocations to their highest since early 2022—arguably chasing performance as FOMO (fear of missing out) continues to drive flows. However, beneath the surface, there is evidence of defensive repositioning. Flows into sectors like consumer staples, healthcare, and utilities have accelerated, while high-growth tech and speculative startups are seeing a slowdown in new capital.

Moreover, demand for downside hedges and portfolio insurance—using options, volatility products, and alternative assets—has risen sharply over the past quarter, as indicated by surging volumes in S&P 500 put contracts and volatility exchange-traded products. Gold prices have pushed above $2,200 per ounce, another sign of hedging against potential equity downturns.

Rotation Risks: The AI Factor and Tech Dominance

The dominance of AI and semiconductor stocks—Nvidia, for instance, is up more than 30% in the first three quarters of 2025—remains a paradoxical driver of both bullishness and valuation worries. While investors are enthusiastic about the transformative potential of artificial intelligence, valuation multiples have expanded to levels not seen since the 2000 tech bubble. The forward price-to-earnings ratios for some leading AI names exceed 35, well above the S&P 500 historical average of 16 to 18.

Several analysts warn that any disappointment in AI adoption trends, regulatory headwinds, or geopolitical disruptions—especially in key markets like China—could trigger a swift unwind in tech sector leadership, with broad consequences for index valuations.

Strategic Outlook: Navigating Uncertainty

So what does this mean for investors and capital markets? Experts advise a blend of caution and tactical agility for the remainder of 2025. Diversification across asset classes and geographies is recommended, as is a focus on companies with strong balance sheets and steady cash flows. Some are advocating incremental allocation to bonds, where yields—after the Fed’s hiking cycle—remain attractive relative to equities for the first time in years.

In addition, many asset managers are reviewing their private market and alternative investments, seeking resilient sources of return that are less correlated to equity index performance. Within public equities, value stocks and dividend payers are regaining attention as viable counterweights to growth-driven names.

Conclusion: The Cautious Road Ahead

With most major indices priced for perfection and more fund managers than ever flagging overvaluation risks, the second half of 2025 could prove volatile for global equity markets. While the bull market has shown remarkable resilience so far, investors may need to brace for bigger swings as economic and policy narratives evolve. Carefully monitoring macro data, central bank signals, and corporate earnings will be crucial for navigating uncertain waters over the coming months.