According to @charliebilello, the S&P 500 has experienced a notable number of large down days in 2025, signaling heightened volatility and risk-off sentiment among equity investors (source: @charliebilello via @QCompounding, June 18, 2025). For crypto traders, such equity market drawdowns historically correlate with increased volatility in leading cryptocurrencies like BTC and ETH, as risk appetites shift and correlations between equities and digital assets intensify during major sell-offs. Monitoring these S&P 500 movements is crucial for managing crypto portfolio risk and identifying short-term trading opportunities.