股票股指期权：偏度正偏分位较高，可考虑牛市看涨价差

Report Date - The report is dated July 24, 2025 [1] Investment Rating - No investment rating for the industry is provided in the report Core Viewpoint - Due to the high positive skew percentile of stock index options, a bullish call spread strategy can be considered [2] Data Summary Underlying Market Statistics - The closing prices of the Shanghai Stock Exchange 50 Index, CSI 300 Index, and CSI 1000 Index are 2812.44, 4149.04, and 6701.12 respectively, with increases of 11.24, 29.27, and 93.90 [3] - The trading volumes of the Shanghai Stock Exchange 50 Index, CSI 300 Index, and CSI 1000 Index are 60.28 billion, 319.63 billion, and 285.42 billion hands respectively, with changes of -7.65 billion, 19.13 billion, and -8.69 billion hands [3] Option Market Statistics - The trading volumes of Shanghai Stock Exchange 50 Index Options, CSI 300 Index Options, and CSI 1000 Index Options are 36,748, 87,017, and 196,037 respectively, with changes of -18,679, -46,300, and -29,170 [3] - The open interests of Shanghai Stock Exchange 50 Index Options, CSI 300 Index Options, and CSI 1000 Index Options are 62,312, 173,462, and 232,248 respectively, with changes of 2,593, 6,427, and 6,805 [3] Option Volatility Statistics - The ATM - IV of Shanghai Stock Exchange 50 Index Options, CSI 300 Index Options, and CSI 1000 Index Options are 16.65%, 16.55%, and 20.21% respectively, with changes of 0.21%, -0.11%, and 0.91% [6] - The Skew of Shanghai Stock Exchange 50 Index Options, CSI 300 Index Options, and CSI 1000 Index Options are 16.39%, 14.22%, and 7.27% respectively, with changes of 0.57%, 5.34%, and 1.49% [6]