Core Viewpoint - The domestic natural gas heavy truck market has experienced significant growth, with sales in October reaching 21,100 units, a year-on-year increase of nearly 140%, marking a doubling trend for two consecutive months [1][4][16]. Group 1: Market Performance - In October 2025, the sales of natural gas heavy truck engines reached 21,100 units, representing a 138% year-on-year increase [4][12]. - Cumulatively, from January to October 2025, the total sales of natural gas heavy truck engines amounted to 166,800 units, reflecting a 6% year-on-year growth, with a net increase of approximately 9,500 units compared to the same period last year [1][16][20]. - The market saw a reversal in cumulative sales growth after a decline in previous months, indicating a strong recovery in September and October [16][27]. Group 2: Engine Specifications - The dominant engine displacement categories for natural gas heavy trucks in 2025 are 12-13L and 14-15L, accounting for 43.27% and 39.63% of the market, respectively [6]. - The market share of engines with over 15L displacement is relatively low at 4.17%, with a slight increase to 5.48% in October [6]. - In terms of horsepower, the primary segments are 500-600 horsepower and 400-500 horsepower, comprising 43.82% and 37.58% of the market, respectively, while engines with horsepower ≥600 represent 16.36% [9]. Group 3: Leading Companies - Weichai Power continues to dominate the market with a monthly sales volume of 11,000 units in October, achieving a market share of 52.00%, marking its tenth consecutive month at the top [12][14]. - Cummins (including Foton Cummins and Dongfeng Cummins) ranked second with a total of 4,040 units sold, holding a market share of 19.15% [14][20]. - Other notable companies include FAW Jiefang with 2,655 units (12.58% market share), Yuchai with 1,280 units (7.70%), and Dongfeng Longqing with 1,220 units (7.32%) [14][20]. Group 4: Sales Rankings - The top-selling natural gas heavy truck engines from January to October 2025 include the WP13NG480E61 from Weichai with 44,600 units sold, representing a market share of 26.74% [22][23]. - Weichai has five models in the top ten sales list, while Cummins has three, and Dongfeng Longqing and FAW Jiefang each have one model [23]. Group 5: Future Outlook - The natural gas heavy truck market is expected to continue its growth trajectory, with a strong performance in the last quarter of the year, indicating a positive outlook for the industry [27].