A recent analysis by Bank of America revealed that cash levels in global investors' portfolios have dropped to 3.9%, marking one of the lowest readings in history and triggering a sell signal. This survey included 171 fund managers managing $450 billion in assets. Additionally, the concentration of the top 10 stocks in the S&P 500 has reached a record high of 40% of the index's market value, significantly higher than the 26% seen seven years ago and 14 percentage points above levels during the 2000 Dot-Com Bubble. The U.S. stock market has never been larger, accounting for 74% of the MSCI world market capitalization, three times more than Europe and Japan combined. Furthermore, U.S. households' stock allocation has hit a record 43.4% of financial assets, surpassing the levels seen during the Dot-Com Bubble by five percentage points. Warren Buffett's Berkshire Hathaway has also reached a cash position of $325 billion, the largest allocation to cash in over 30 years, as institutional investors' allocation to U.S. stocks reached a record 36%, while their cash levels hit the lowest since 2001.