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What's the difference between Shanghai A shares and Shenzhen B shares?

A shares, that is, RMB ordinary shares, are ordinary shares issued by companies in China for domestic institutions, organizations or individuals to subscribe and trade in RMB. The official name of B shares is RMB special shares, which are denominated in RMB, subscribed and traded in foreign currency, and listed and traded on domestic (Shanghai, Shenzhen) stock exchanges.