The latest AAII survey via Bloomberg indicates a persistent bullish sentiment among U.S. investors, with the bull-bear spread at 18.2, down from 25.9 last week. This week, bulls constitute 45.5% of respondents, a decline from 49.6%, while bears have increased to 27.3% from 23.7%. The survey also shows a slight rise in neutral sentiment to 27.3% from 26.7%. This sustained optimism has been a significant factor supporting the strength observed in the stock market, marking one of the most persistent bullish trends in the past two decades.