Shanghai International Energy Exchange data showed crude oil futures' main contract for October 2026 delivery closed at 592.90 yuan/barrel on Aug 21, up 8.00 yuan, or 1.37%. Total trading volume across all contracts reached 157,930 lots, while open interest fell 571 lots to 74,837 lots. The main contract saw volume of 132,364 lots, with open interest up 465 lots to 43,369 lots.