The purchase would put the US company among several other key investors in the massive IPO next month, including the sovereign investment funds of Qatar and Kuwait, British bank Standard Chartered and two Hong Kong tycoons.
AgBank — the last of China’s big four lenders to list — plans to float its shares in Hong Kong and Shanghai next month.
Recent estimates on the size of the offering have ranged from about $19 billion to about $28 billion.
The world’s biggest IPO so far is the $22 billion offering of Industrial and Commercial Bank of China in 2006.