Biggest stock offerings to date

Chinese online giant Alibaba is set for one of the largest stock offerings in history. Here is a list of the biggest initial public offerings (IPOs) to date:

- AgBank ($22.1 billion). Agricultural Bank of China made its market debut in 2010 in Hong Kong and Shanghai.

- ICBC ($21.9 billion). Industrial and Commercial Bank of China went public in 2006, also trading on the Hong Kong and Shanghai markets.

- AIA Group ($20.5 billion). A unit of US insurance giant AIG was spun off in 2010 on the Hong Kong exchange.

- Visa Inc. ($19.6 billion). The US card payment giant went public in New York in 2008.

- NTT DoCoMo ($18.4 billion). The Japanese mobile operator, spun off from NTT, made its market debut in Tokyo in 1998.

- General Motors ($18.1 billion). The US auto giant returned to the stock market in New York and Toronto in 2010, a year and a half after a government-led rescue.

- Enel ($17.4 billion) The Italian energy group began trading in 1999 in Milan and New York.

- Facebook ($16 billion). The world's leading social network was the largest tech sector IPO in 2012 in New York.

- NTT ($13.6 billion). The former state-owned Nippon Telegraph & Telephone Corp made a 1986 market debut in Tokyo.

- Deutsche Telekom ($13 billion). The German telecom giant hit the market in 1996, trading in Frankfurt, New York and Tokyo.