TLDR
- Bank of America’s proprietary Bull & Bear Indicator reached 8.0, activating a contrarian sell alert for risk-on assets.
- Strategist Michael Hartnett cautioned that AI-focused equities may balloon to 47–48% of total U.S. market capitalization, eclipsing dot-com era extremes.
- Goldman Sachs data reveals hedge funds accumulated technology shares at their quickest rate in almost three months during the past week.
- Escalating bond yields and inflationary pressures identified as primary risks to the current AI-driven market surge.
- Cryptocurrency benchmark Bitcoin has dropped 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 cautionary message this week suggesting the U.S. equity market’s fixation on artificial intelligence technology may be nearing concentration levels unseen since some of the most notorious speculative manias in financial history.
In his May 22 client note, Hartnett projected that if highly anticipated public offerings from heavyweight firms such as SpaceX, OpenAI, and Anthropic come to fruition, the artificial intelligence sector’s portion of total U.S. market value could swell to between 47% and 48%. Such concentration would exceed the peaks witnessed during the late-1990s internet frenzy, Japan’s asset bubble of the 1980s, and the Nifty Fifty phenomenon, trailing only behind the railroad expansion of the 1880s.
Hartnett identified robust price trends, declining market volatility, and substantial retail trader involvement as indicators that speculative fervor has already taken root across financial markets.
Contrarian Sell Indicator Activates at BofA
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 historical readings exceeding 8 typically foreshadowing diminished forward returns.
Hartnett observed that 17 prior sell warnings have materialized since 2002. International equity markets declined by an average of 2% to 3% during the subsequent two-to-three-month windows, with peak-to-trough declines occasionally stretching between 15% and 20%.
Nevertheless, capital continues flowing into markets. Domestic equity funds recorded their eighth consecutive week of net inflows. Technology-focused funds alone attracted $9 billion, marking the largest single-week accumulation since October 2025.
BofA’s private wealth clients currently maintain an unprecedented 65.7% equity allocation in their investment portfolios. Meanwhile, cash positions have contracted to approximately 10%, hovering near all-time lows.
Hartnett identified ascending bond yields as the principal danger to the ongoing market advance. He cautioned that “bond vigilantes” are beginning to resist prevailing market euphoria, with vulnerabilities emerging across emerging markets, residential real estate, and private equity sectors.
He highlighted deterioration in Asian currencies including the Indian rupee and Indonesian rupiah as evidence of mounting financial strain. Additionally, he drew attention to a dramatic surge in semiconductor pricing across Asia, noting Korean semiconductor export values have climbed 148% year-over-year while DRAM chip prices have skyrocketed 223%, contending that Asia is transmitting inflation globally.
Hedge Fund Community Amplifies Technology Exposure
Meanwhile, a client communication from Goldman Sachs released Friday revealed that hedge fund managers purchased technology equities during the previous week at their most aggressive pace in nearly three months.
The acquisition activity was concentrated by dollar volume in North American and Asian emerging market securities. Fund managers accumulated semiconductor manufacturers and software developers while reducing positions in communications infrastructure and information technology services providers.
Hedge fund positioning in technology relative to the MSCI World Index benchmark now stands at its most elevated level in more than five years. Long exposures to global information technology stocks have reached record territory extending back to 2016, when Goldman Sachs Prime Brokerage initiated systematic tracking of these investment flows.
Goldman’s analysis noted that AI-related enterprises, especially semiconductor fabricators and chip designers, have demonstrated resilience despite worldwide economic volatility arising from the Iran conflict.
Divergent Asset Class Performance Patterns
Oil has emerged as the dominant major asset class in 2026, advancing more than 70% year-to-date. Emerging-market equity indices have appreciated over 17%. Conversely, Bitcoin has declined in excess of 11% during the same period.
Hartnett indicated that commodities and emerging market assets continue to represent compelling long-term investment themes. He further suggested that consumer-oriented equities may present attractive entry points once the present market cycle reaches its zenith.
He refrained from forecasting an imminent market collapse. His guidance for market participants was to maintain a posture that is “long and paranoid,” reconciling powerful market momentum against mounting threats from inflation dynamics, interest rate trajectories, and overcrowded positioning. Significant policy tightening measures, he projected, remain improbable until U.S. inflation metrics climb back toward the 4% to 5% range.
