期指：短线或反弹，趋势上慢牛格局进一步明确

Report Summary 1. Report Industry Investment Rating No information provided. 2. Core View of the Report - On September 18, all four major stock index futures contracts for the current month declined. The IF dropped 1.35%, the IH fell 1.45%, the IC decreased 1%, and the IM declined 1.19%. In the short term, the stock index futures may rebound, and the slow - bull pattern in the trend is becoming clearer [1]. - On the trading day, the total trading volume of stock index futures rebounded, indicating an increase in investors' trading enthusiasm. The total trading volume of IF, IH, IC, and IM increased by 57,520 lots, 35,836 lots, 72,444 lots, and 143,070 lots respectively. In terms of positions, the total positions of IF, IH, IC, and IM increased by 14,691 lots, 10,071 lots, 19,056 lots, and 25,806 lots respectively [1][2][3]. 3. Summary by Relevant Catalogs 3.1 Stock Index Futures Data - September 18 Quotes: The closing prices of the four major stock index futures all decreased. For example, the closing price of IF2509 was 4,487.2, down 1.35%; IH2509 was 2,910.8, down 1.45%; IC2509 was 7,171.6, down 1%; IM2509 was 7,454.8, down 1.19%. There were also corresponding changes in trading volume, open interest, and basis [1]. - Trading Volume and Open Interest Changes: The total trading volume of all four major stock index futures increased, and the total open interest also showed an upward trend [2][3]. 3.2 Long and Short Positions of Top 20 Members - For different contracts such as IF2509, IH2509, IC2509, and IM2509, there were changes in the increase or decrease of long and short positions. For example, in IF2509, long positions decreased by 17,195, and short positions decreased by 18,103 [5]. 3.3 Trend Intensity - The trend intensity of IF and IH is 1, and the trend intensity of IC and IM is also 1, indicating a certain degree of upward trend [7]. 3.4 Important Drivers - In the overseas market, chip stocks boosted the four major US stock indexes to record highs, while Chinese concept stocks declined. In the domestic A - share market, the Shanghai Composite Index fell 1.15%, the Shenzhen Component Index fell 1.06%, and the ChiNext Index fell 1.64%. The trading volume reached 3.17 trillion yuan, an increase from the previous day [8].