股票股指期权：盘中隐波与标的呈现正相关上行，隐波溢价扩大

Report Summary 1. Market Conditions - On July 29, 2025, in the stock index option market, the intraday implied volatility showed a positive correlation with the underlying assets and increased, and the implied volatility premium expanded [1]. 2. Market Data 2.1 Underlying Market Statistics - Indices: The closing prices of the Shanghai - Shenzhen 300 Index, the CSI 1000 Index, and the Shanghai Composite 50 Index were 4152.02, 6773.88, and 2808.59 respectively, with increases of 16.20, 43.91, and 5.82. Their trading volumes were 230.81 billion, 259.26 billion, and 47.05 billion shares, with changes of 8.05 billion, 6.52 billion, and - 2.69 billion shares [1]. - ETFs: The closing prices of the Huatai - Bairui 300 ETF, the Southern 500 ETF, and the ChinaAMC Science - Innovation 50 ETF were 4.235, 6.431, and 1.125 respectively, with increases of 0.021, 0.040, and 0.015. Their trading volumes were 8.06 billion, 2.13 billion, and 37.52 billion shares, with changes of 2.03 billion, 0.11 billion, and - 0.73 billion shares [1]. 2.2 Option Market Statistics - Trading Volume and Open Interest: The trading volumes of the Shanghai - Shenzhen 300 Index Option, the CSI 1000 Index Option, and the Shanghai Composite 50 Index Option were 71146, 181506, and 26240 respectively, with changes of - 5069, 476, and - 5095. Their open interests were 191714, 253286, and 70462 respectively, with changes of 3662, 7762, and 1265 [1]. - PCR Indicators: The VL - PCR of the Shanghai - Shenzhen 300 Index Option, the CSI 1000 Index Option, and the Shanghai Composite 50 Index Option were 58.24%, 81.44%, and 44.26% respectively, and the OI - PCR were 72.66%, 96.82%, and 55.62% respectively [1]. 2.3 Option Volatility Statistics - ATM - IV and HV: For the Shanghai - Shenzhen 300 Index Option, the near - month ATM - IV was 15.72% with a change of - 0.07%, and the same - term HV was 6.49% with a change of - 0.04%. For the CSI 1000 Index Option, the near - month ATM - IV was 19.03% with a change of - 0.36%, and the same - term HV was 8.53% with a change of 0.04% [4]. - Skew and VIX: The skew of the Shanghai - Shenzhen 300 Index Option was 9.81% with a change of - 2.44%, and the VIX was 19.76 with a change of 0.059. The skew of the CSI 1000 Index Option was 1.81% with a change of - 1.18%, and the VIX was 23.21 with a change of - 0.002 [4]. 3. Option - Specific Charts - For each type of option (such as the Shanghai Composite 50 Index Option, the Shanghai - Shenzhen 300 Index Option, etc.), there are charts showing the full - contract PCR, the main - contract volatility, the main - contract skew, the volatility cone, and the volatility term structure [8][12][15].