Offer your thoughts or opinion on the input financial query or topic using your financial background.

Find out the difference between two stocks of the same company (how to identify ADRs, etc)
Generally, when I run across this kind of situation, I look for the Investor Relations section of the corporate website for a 'Stock Information' (or similar) tab or link.   This usually contains information explaining the different shares classes, how they relate (if at all), voting and/or dividend rights, and taxation differences for the different classes. However, I have trouble finding such a page on a central BYD corporate investor relations page.   I did find this page detailing the HK1211 shares: http://www.byd.com/investor/base_information.html.  I don't know what or why, but something tells me this is an older page. Searching on, I also found this page which looks newer and clarifies that the difference you are seeing is between 'A' and 'H' shares. http://www.byd.cn/BYDEnglish/basic/article.jsp?articleId=1524676.  (I'm guessing but I'd think somewhere in the announcements on this byd.cn site, you may find more details of any structural differences between share classes -- I just didn't want to page through them all.)