Core Insights - The rapid increase in margin debt indicates that the bullish sentiment in the market may be reaching its peak [1] Group 1 - The recent surge in margin debt suggests a potential shift in market dynamics, as investors may be over-leveraging [1] - This trend could signal a cooling off period for the current bullish market, raising concerns about sustainability [1] - Analysts are closely monitoring margin debt levels as a key indicator of market health and investor behavior [1]