Stock codes in mainland China consist of numeric sequences rather than alphabetic tickers, utilizing distinct ranges to designate specific exchanges and share classes. Equities listed on the Shanghai Stock Exchange typically begin with prefixes such as 600 or 601 for main board stocks and 688 for the STAR Market, while Shenzhen Stock Exchange listings commonly start with 000 for main board shares, 300 for the ChiNext market, and 002 for small- and medium-sized enterprise boards.