Xin Lang Qi Huo·2025-08-12 08:23Group 1 - The main contract for alumina (2509) closed at a price increase of 4.16% as of August 12, with a trading volume of 296,300 contracts and a net long position of 428 contracts among the top 20 positions [1][2] - Total trading volume for all alumina contracts reached 696,100 contracts, an increase of 356,700 contracts compared to the previous day [1][3] - Among the top 20 positions, long positions totaled 239,200 contracts, up by 16,300 contracts, while short positions totaled 269,500 contracts, an increase of 7,117 contracts [1][4] Group 2 - The top three long positions were held by Dongzheng Futures (21,383 contracts), CITIC Futures (18,350 contracts), and Guotai Junan (18,074 contracts) [1][3] - The top three short positions were held by Guotai Junan (37,564 contracts), Galaxy Futures (20,764 contracts), and CITIC Futures (20,347 contracts) [1][4] - The largest increase in long positions among the top 20 was seen in CITIC Futures (7,295 contracts, up by 2,473 contracts), while the largest decrease was in Dongzheng Futures (3,350 contracts, down by 1,903 contracts) [1][3]