周五过后，美股“隐形护盘手”撤离！

Group 1 - Investors are holding a significant amount of call options, which are set to expire on Friday, potentially leading to a halt in the market's upward momentum as these positions are closed [1][3] - The total value of the options expiring this week is approximately $3.4 trillion, which is considered normal for a monthly expiration [3] - The Cboe put-call ratio has dropped to 0.7, the lowest since February 14, indicating a strong preference for call options among investors [3] Group 2 - As the stock market continues to rise, the preference for call options has become increasingly evident over the past two weeks [3] - Option market makers typically need to buy stocks or index futures to hedge their risk exposure when investors heavily purchase call options [3] - Market volatility is expected to increase next week as market makers will no longer need to hedge large long positions [3]