Summary Box: China's AgBank IPO nabs $19.2 billion

THE WINDFALL: Agricultural Bank of China's initial public offering has raised more than $19 billion in what could turn out to be the largest IPO ever. If underwriters buy up more shares to meet investor demand, the dual-listing deal could raise $22.12 billion -- the most in IPO history.

THE BACKDROP: Originally AgBank was expected to pull in a whopping $30 billion. But investors appeared unwilling to pay such a premium for a bank whose profitability is viewed as weaker than its urban-focused competitors.

THE ONE TO BEAT: Industrial and Commercial Bank of China's $21.9 billion IPO in October 2006 currently reigns as the biggest such deal.