(Update Nov 6) Keso wrote an interesting piece about Ma Yun and Alibaba IPO. DBANotes also has an interesting article about Alibaba IPO. The author Fenng works for Ali.
(Original) The ticker symbol is 1688.HK. It opened at HKD 30.00, a big jump from the IPO price HKD 13.50.
I have not looked at its prospectus, as I am not interested in big name IPO, nor am I an expert in B2B. Andy Yu wrote a good blog about B2B, the business Alibaba is involved in.
On the other hand, I do like the other arm of Alibaba group, the Alimama, or Ali Soft. Alimama is an online ad platform for small business. I think at some point it will challenges Baidu and Google.
Alibaba and Alimama are separate divisions of Alibaba group, the group owned and managed by big mouth Ma Yun.