期指：美联储降息25个基点，震荡走势

Report Summary 1. Industry Investment Rating No industry investment rating is provided in the report. 2. Core View On September 17, all four major stock index futures contracts for the current month rose, with IF up 0.8%, IH up 0.2%, IC up 1.26%, and IM up 1.25%. The total trading volume of stock index futures rebounded, indicating increased trading enthusiasm among investors. The trends of different contracts in terms of trading volume, open interest, basis, and positions of the top 20 member institutions vary. The trend intensities of IF and IH are 1, while those of IC and IM are 1.68850. Important drivers include diplomatic news, Fed's interest - rate cut, and the performance of the A - share market [1][2][7]. 3. Summary by Relevant Catalogs 3.1 Stock Index Futures Data - Trading Volume and Open Interest: The total trading volume of IF increased by 8,988 lots, IH by 5,233 lots, IC by 2,247 lots, and IM by 23,931 lots. The total open interest of IF decreased by 2,680 lots, IH increased by 4,021 lots, IC decreased by 10,820 lots, and IM decreased by 579 lots [2]. - Closing Price and Basis: For example, the closing price of IF2509 was 4,553.2 with a basis of - 2.18 points; the closing price of IH2509 was 2,956.2 with a basis of 3.42 points; the closing price of IC2509 was 7,252.4 with a basis of - 7.64 points; the closing price of IM2509 was 7,547 with a basis of - 7.81 points [1]. - Positions of the Top 20 Member Institutions: The changes in long and short positions of different contracts vary. For instance, in IF2509, long positions decreased by 12,990 and short positions decreased by 13,237 [6]. 3.2 Trend Intensity - The trend intensities of IF and IH are 1, and those of IC and IM are 1.68850. The trend intensity ranges from - 2 (most bearish) to 2 (most bullish) [7]. 3.3 Important Drivers - Diplomatic news: Regarding Sino - US high - level interactions and the TikTok ban, relevant departments have provided information [7]. - Fed's Interest - Rate Cut: The Fed cut interest rates by 25 basis points, emphasizing employment downside risks and expecting two more cuts this year [7]. - A - Share Market Performance: The Shanghai Composite Index rose 0.37% to 3,876.34 points, the Shenzhen Component Index rose 1.16%, and the ChiNext Index rose 1.95%. The A - share market had a total trading volume of 2.4 trillion yuan, up from 2.37 trillion yuan the previous day [7].