化工行业周报2025年11月第3周：碳酸二甲酯、氯化亚砜价格涨幅居前，建议关注有机硅行业-20251124

Investment Rating - The report maintains a recommendation for the organic silicon industry, highlighting its potential benefits from the chemical sector's internal competition [4]. Core Viewpoints - The chemical sector experienced a decline of 7.47% in the third week of November, underperforming the Shanghai Composite Index by 3.58 percentage points [13]. - The only sub-industry that saw an increase was petroleum processing, which rose by 2.64%, while 31 sub-industries declined, with the largest drop in acrylic fiber at -15.33% [17]. - Key products with significant price increases included dimethyl carbonate (+12.32%) and thionyl chloride (+11.39%), while liquid chlorine saw the largest decrease at -6.25% [22][3]. - The report suggests focusing on leading companies that benefit from the chemical sector's internal competition, such as Xin'an Chemical, Xingfa Group, and Baofeng Energy [4]. Industry Performance - The chemical sector's dynamic PE ratio stands at 23.78, significantly higher than the average PE of 5.33 since 2015 [13]. - The total number of stocks in the industry is 446, with a total market value of 7114.2 billion and a circulating market value of 6648.5 billion [5]. Price and Spread Trends - The report lists the top five products with the highest price increases and decreases, indicating significant volatility in the market [22][3]. - The price spread for propylene (methanol-based) increased by 296.55%, while the PTA spread decreased by 157.04% [42][46]. Inventory Changes - Notable inventory changes include a decrease in stocks of chlorpyrifos (-12.5%) and propylene oxide (-11.83%), while polyester filament saw an increase of 10.21% [66].