On Monday, the stock market experienced a significant selloff, prompting a record number of investors to purchase S&P 500 put options. Despite the market downturn, both retail and professional investors took the opportunity to 'buy the dip.' This strategy, typically associated with retail investors, was notably adopted by big-money investors during this selloff. The Nations TailDex index, which measures market expectations of extreme events, spiked to its highest level since the 2020 pandemic, indicating heightened market anxiety.