Woofun AI reports that Michael Hartnett, Chief Investment Strategist at Bank of America, issued a warning as the bank's proprietary "Bull & Bear Indicator" reached a historical extreme of 9.6. Current investor optimism rests on four assumptions: no economic hard landing, no Fed rate hike, no AI capex cut, and no Democratic midterm sweep, creating a market with minimal short interest. Fund flow data confirms exuberance, with U.S. stock assets receiving $55.8 billion in net inflows while money market funds saw $119.6 billion outflow, the largest weekly cash exodus since April 2026. The tech sector attracted a record $48.8 billion in three weeks, described as an institution-led momentum chase.

Hartnett advises exiting risk assets in summer to shift toward long-duration government bonds, defensive sectors, high dividend stocks, and the U.S. dollar. He identifies the U.S. mega-cap ETF MAGS as a key indicator: a drop below $65 would drag down cyclical sectors, while a break above $70 signals re-entry opportunity. The primary tail risk involves super-mega tech companies cutting AI capex, failing to drive Mag7 to new highs, which could trigger significant negative impacts on growth and asset prices, catalyzing massive short positions in banks, brokers, and industrial stocks.