http://finance.yahoo.com/news/chinese-companies-pull-us-stock-095649722.html ...can you hear the giant vacuum noise?
Just read that earlier. Could be one of several reasons; they didn't like having to comply with US financial laws and decided to pull out, their IPO positions were sold for more than they bought them back for, or they know something's up. What's your guess?
The Wanting to get away from complying with the us system is a pretty good bet. China likes to keep their cards very close. Also their economy is also headed down the crapper too and I don't think they want much of that info out in the public domain.