A recent Bank of America survey reveals that market sentiment remains 'extremely optimistic,' despite growing concerns over corporate overinvestment. The survey, conducted among 162 portfolio managers overseeing $440 billion in assets, shows a slight increase in cash balances from 3.2% in January to 3.4%. Investors continue to favor commodities and equities over bonds, while macroeconomic optimism has reached its highest level since February 2022. However, a record number of respondents believe corporate spending is overly aggressive, prompting chief investment officers to focus on strengthening balance sheets rather than increasing capital expenditures. The potential burst of the AI bubble has emerged as the top tail risk for investors, reflecting heightened caution in the market.