避险情绪上升，股指震荡回调

1. Report Industry Investment Rating - No relevant content provided 2. Core Viewpoints of the Report - On October 17, 2025, all stock indices fluctuated and declined, showing weakness throughout the day. The total trading volume of the Shanghai, Shenzhen, and Beijing stock markets was 1954.4 billion yuan, an increase of 570 million yuan from the previous day. Recently, overseas uncertainty risk factors have increased, and the risk - aversion sentiment has risen. Stocks with large previous gains face technical adjustment pressure due to profit - taking. From a macro perspective, the inflation and credit data in September were weak, strengthening the expectation of demand - stabilizing policies on the policy front, which provides medium - to - long - term support for the stock indices. A major policy meeting will be held next week, and the policy front is highly likely to stabilize demand and expectations. In general, the subsequent market trend depends on the rhythm change of the game between profit - taking sentiment and policy -利好 expectations. In the short term, the stock indices are expected to remain in a wide - range shock. Currently, the implied volatility of options remains relatively stable. Considering the medium - to - long - term upward trend of the stock indices, investors can continue to hold bull spreads or covered calls [3] 3. Summary by Relevant Catalogs 3.1 Option Indicators - Index and ETF Performance: On October 17, 2025, the 50ETF fell 1.55% to 3.110; the 300ETF (Shanghai Stock Exchange) fell 2.05% to 4.624; the 300ETF (Shenzhen Stock Exchange) fell 2.13% to 4.768; the CSI 300 Index fell 2.26% to 4514.23; the CSI 1000 Index fell 2.92% to 7185.48; the 500ETF (Shanghai Stock Exchange) fell 3.03% to 7.114; the 500ETF (Shenzhen Stock Exchange) fell 2.84% to 2.844; the ChiNext ETF fell 3.28% to 2.915; the Shenzhen 100ETF fell 2.92% to 3.393; the SSE 50 Index fell 1.70% to 2967.77; the STAR 50ETF fell 3.63% to 1.43; the E Fund STAR 50ETF fell 3.68% to 1.39 [5] - Volume and Open Interest PCR: The report provides the volume and open interest PCR data of various options on October 17, 2025, and their changes compared with the previous trading day. For example, the volume PCR of SSE 50ETF options was 107.36 (previous day: 94.91), and the open interest PCR was 80.26 (previous day: 84.60) [6] - Implied Volatility and Historical Volatility: The report lists the implied volatility of at - the - money options in November 2025 and the 30 - trading - day historical volatility of the underlying assets for various options. For instance, the implied volatility of at - the - money SSE 50ETF options in November 2025 was 14.46%, and the 30 - trading - day historical volatility of the underlying asset was 13.31% [7] 3.2 Relevant Charts - SSE 50ETF Options: It includes charts of the SSE 50ETF's trend, option volatility, volume PCR, open interest PCR, implied volatility curve, and at - the - money implied volatility of different tenors [9][11][13][19] - SSE 300ETF Options: There are charts of the SSE 300ETF's trend, option volatility, volume PCR, open interest PCR, implied volatility curve, and at - the - money implied volatility of different tenors [20][22][24][26] - SZSE 300ETF Options: The charts cover the SZSE 300ETF's trend, option volatility, volume PCR, open interest PCR, implied volatility curve, and at - the - money implied volatility of different tenors [32][34][36][38] - CSI 300 Index Options: Include charts of the CSI 300 Index's trend, option volatility, volume PCR, open interest PCR, implied volatility curve, and at - the - money implied volatility of different tenors [45][47][49][51] - CSI 1000 Index Options: There are charts of the CSI 1000 Index's trend, option volatility, volume PCR, open interest PCR, implied volatility curve, and at - the - money implied volatility of different tenors [58][62][64][66] - SSE 500ETF Options: The charts involve the SSE 500ETF's trend, option volatility, volume PCR, open interest PCR, implied volatility curve, and at - the - money implied volatility of different tenors [73][75][77][79] - SZSE 500ETF Options: Include charts of the SZSE 500ETF's trend, option volatility, volume PCR, open interest PCR, implied volatility curve, and at - the - money implied volatility of different tenors [86][89][91][92] - ChiNext ETF Options: There are charts of the ChiNext ETF's trend, option volatility, volume PCR, open interest PCR, implied volatility curve, and at - the - money implied volatility of different tenors [99][101][103][105] - Shenzhen 100ETF Options: The charts cover the Shenzhen 100ETF's trend, option volatility, volume PCR, open interest PCR, implied volatility curve, and at - the - money implied volatility of different tenors [112][114][116][118] - SSE 50 Index Options: Include charts of the SSE 50 Index's trend, option volatility, volume PCR, open interest PCR, implied volatility curve, and at - the - money implied volatility of different tenors [125][127][129][131] - STAR 50ETF Options: There are charts of the STAR 50ETF's trend, option volatility, volume PCR, open interest PCR, implied volatility curve, and at - the - money implied volatility of different tenors [138][140][141][147] - E Fund STAR 50ETF Options: The charts cover the E Fund STAR 50ETF's trend, option volatility, volume PCR, open interest PCR, implied volatility curve, and at - the - money implied volatility of different tenors [148][150][151][154]