Citi, Bank of America, Citadel, IMF, Apollo & BIS have all warned for one reason or another.

Crowded long positions in tech + rising bond yields is a classic warning sign of potential volatility.
Record leveraged ETF money shows retail is still very bullish and using max leverage.
Extra liquidity from M2 is the main fuel keeping stocks elevated despite warnings.

Bank of America red flags note coverage: https://www.axios.com/2026/06/09/stocks-tech-bofa-analysts
Citadel on Fed risks: https://www.bloomberg.com/news/articles/2026-06-08/citadel-securities-sees-risk-of-fed-forced-to-raise-rates-soon
Apollo mid year outlook: https://www.apollo.com/wealth/insights-news/insights/the-view-from-apollo/2026/06/2026-mid-year-outlook