TLDR
- Bank of America’s proprietary Bull & Bear Indicator reached 8.0, activating a contrarian sell alert for risky assets.
- Strategist Michael Hartnett cautioned that AI companies could represent 47–48% of total U.S. equity market value, exceeding dot-com bubble concentration.
- Hedge funds purchased technology equities at their most aggressive pace in almost 90 days last week, according to Goldman Sachs data.
- Elevated bond yields combined with inflationary pressures represent primary risks to continued AI sector momentum.
- Bitcoin has declined over 11% year-to-date while crude oil has surged more than 70%, highlighting divergent asset class performance.
Michael Hartnett, a prominent strategist at Bank of America, delivered a stark assessment this week suggesting the U.S. equity market’s concentration in artificial intelligence companies may be nearing historically extreme territory.
In his May 22 client note, Hartnett projected that if major anticipated public offerings from firms such as SpaceX, OpenAI, and Anthropic materialize, the artificial intelligence sector could command between 47% and 48% of total U.S. market capitalization. This concentration would exceed levels witnessed during the late-1990s internet boom, Japan’s asset bubble in the 1980s, and the Nifty Fifty phenomenon, trailing only the 1880s railroad mania.
Hartnett identified robust price trends, declining market volatility, and elevated retail investor engagement as indicators that speculative dynamics are already manifesting across financial markets.
Contrarian Indicator Reaches Critical Threshold
The Bull & Bear Indicator maintained by Bank of America climbed to 8.0, activating what the institution characterizes as a contrarian sell warning. This proprietary gauge monitors investor allocation patterns and market sentiment, with readings exceeding 8 historically correlating with subdued subsequent performance.
Hartnett observed that 17 prior sell warnings have occurred since 2002. International equities declined by an average of 2% to 3% during the two-to-three-month windows following these signals, with peak declines ranging from 15% to 20% in certain instances.
Nevertheless, capital continues flowing into markets. U.S.-focused equity funds recorded their eighth consecutive week of positive flows. Technology-sector funds alone attracted $9 billion, marking the largest single-week influx since October 2025.
Private clients at BofA now maintain an all-time high allocation of 65.7% in equities. Cash holdings have contracted to approximately 10%, approaching historical minimums.
Hartnett identified ascending bond yields as the principal threat to market advances. He cautioned that “bond vigilantes” are beginning to challenge prevailing market enthusiasm, with vulnerabilities emerging across emerging markets, residential real estate, and private equity sectors.
He highlighted weakness in Asian currencies including the Indian rupee and Indonesian rupiah as evidence of financial stress. He also noted dramatic increases in semiconductor pricing throughout Asia, with Korean semiconductor export prices climbing 148% year-over-year and DRAM prices surging 223%, contending that Asia is transmitting inflationary pressure globally.
Institutional Investors Accelerate Technology Exposure
A separate client communication from Goldman Sachs released Friday revealed that hedge funds accumulated technology equities last week at their fastest velocity in nearly three months.
Purchasing activity measured by dollar volume was concentrated in North American and Asian emerging market technology names. Funds increased positions in semiconductor manufacturers and software developers while reducing exposure to telecommunications equipment and IT service providers.
Hedge fund positioning in technology stocks relative to the MSCI World Index now stands at its most elevated level in over five years. Allocations to global information technology equities have reached record highs since Goldman Sachs Prime Brokerage initiated tracking in 2016.
Goldman observed that AI-focused enterprises, especially semiconductor and chip producers, have maintained resilience despite global economic volatility associated with the Iran conflict.
Divergent Performance Across Asset Categories
Oil has emerged as the strongest-performing major asset class in 2026, advancing more than 70% year-to-date. Emerging-market equities have appreciated over 17%. Bitcoin has depreciated more than 11% during the same period.
Hartnett maintained that commodities and emerging market equities represent compelling long-term investment themes. He additionally suggested that consumer-oriented stocks could present attractive opportunities once the present market cycle reaches its apex.
He refrained from forecasting an imminent market collapse. His recommendation for market participants was to remain “long and paranoid,” acknowledging powerful market momentum while recognizing escalating risks from inflation, interest rate dynamics, and concentrated positioning. Significant policy tightening measures, he projected, are improbable until U.S. inflation returns to the 4% to 5% range.
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