Group 1 - Retail investors are currently dominating the U.S. stock market, as indicated by major Wall Street institutions like JPMorgan, Barclays, and Charles Schwab [1][2][3] - Barclays' proprietary stock frenzy index shows that the proportion of stocks in the "frenzy zone" is reaching its highest level of the year, reflecting the aggressive use of zero-day options by retail investors [2][4] - The best-performing stocks since the market low on April 9 are concentrated in unprofitable tech stocks and heavily shorted stocks, showcasing the distinct investment preferences of retail investors [1][3] Group 2 - The popularity of zero-day options among retail investors indicates a significant shift in risk appetite, allowing them to gain high leverage with relatively small capital [2][4] - Institutional investors have been forced to adjust their portfolios due to the active participation of retail investors, although they have not adopted aggressive risk-taking strategies [3][4] - The decline in market volatility, driven by stabilizing economic data such as GDP and inflation, is attracting more funds from volatility-controlled funds into the stock market [4]