Group 1: Report Industry Investment Rating - No relevant information provided Group 2: Core Viewpoints of the Report - The polyolefin market rebounded from the bottom. The spot prices of linear LL remained stable for Sinopec and partially stable for PetroChina, while the spot prices of drawn PP remained stable for Sinopec and some were reduced by 100 by PetroChina. Fundamentally, the polyolefin spot market is still mainly driven by supply and demand. Currently, the PE inventory is being slowly digested, and the PP inventory has also improved. After continuous declines, the short - selling pressure has been released, and the stabilization of crude oil prices provides support for chemical products. The market may rebound after the stop - fall, and attention should be paid to the Federal Reserve meeting this week [2] Group 3: Summary by Relevant Catalogs Futures Market - **LL and PP Prices**: For LL, the previous day's closing prices for January, May, and September contracts were 7232, 7252, and 7269 respectively, with increases of 63, 71, and 219 and increases of 0.88%, 0.99%, and 3.11% respectively. For PP, the previous day's closing prices for January, May, and September contracts were 6966, 6988, and 6967 respectively, with increases of 53, 52, and 180 and increases of 0.77%, 0.75%, and 2.65% respectively [2] - **Trading Volume and Open Interest**: The trading volumes of LL for January, May, and September contracts were 264026, 11216, and 49 respectively, and the open interests were 554975, 37371, and 19 respectively, with open - interest changes of - 6135, 1505, and 19 respectively. For PP, the trading volumes for January, May, and September contracts were 297850, 13616, and 288 respectively, and the open interests were 616154, 57544, and 279 respectively, with open - interest changes of - 27201, 2816, and 279 respectively [2] - **Spreads**: The current spreads of LL for January - May, May - September, and September - January were - 20, - 17, and 37 respectively, compared with previous values of - 12, 131, and - 119. For PP, the current spreads for January - May, May - September, and September - January were - 22, 21, and 1 respectively, compared with previous values of - 23, 149, and - 126 [2] Spot Market - **Raw Materials and Semi - finished Products**: The current prices of methanol futures, Shandong propylene, South China propane, PP recycled materials, North China powder, and plastic film were 2398 yuan/ton, 6600 yuan/ton, 595 dollars/ton, 5600 yuan/ton, 6770 yuan/ton, and 8800 yuan/ton respectively. Most of these prices remained unchanged compared with the previous values [2] - **Mid - stream Products**: The current price ranges of LL in the East China, North China, and South China markets were 7150 - 7700 yuan/ton, 7100 - 7450 yuan/ton, and 7300 - 7750 yuan/ton respectively. The current price ranges of PP in the East China, North China, and South China markets were 6750 - 6950 yuan/ton, 6700 - 6850 yuan/ton, and 6700 - 6900 yuan/ton respectively [2] News - On Monday (September 15), the settlement price of WTI crude oil futures for October 2025 on the New York Mercantile Exchange was $63.30 per barrel, up $0.61 or 0.97% from the previous trading day, with a trading range of $62.52 - $63.67. The settlement price of Brent crude oil futures for November 2025 on the London Intercontinental Exchange was $67.44 per barrel, up $0.45 or 0.67% from the previous trading day, with a trading range of $66.78 - $67.85 [2]