State-owned investment company Central Huijin plans to inject US$40 billion into the Agricultural Bank of China (ABC), the only one of the big four state-owned commercial banks that remains unlisted, the Economic Observer reported (in Chinese). The investment would raise ABC's capital adequacy ratio to 8%, the minimum requirement ratio for commercial banks in China to be listed. The country's other major banks – Bank of China, Industrial and Commercial Bank of China and China Construction Bank – have completed reforms and gone public October last year. ABC is the last of the "big four" banks to undergo shareholder reform, which began in 2003.