I will say it is a very good question however the answer is very simple. It all depends on with whom you got your account open. It's interesting right !! So let me tell you in detail. In India, we got two kinds of depositories. Namely **NSDL** is a short form for National Securities **Depository** Limited which deals with "National Stock Exchange" (NSE), whereas **CDSL** is the short form for Central **Depository** Securities Limited which works for Bombay Stock Exchange (BSE).
Every brokerage firm have their tie-up with respective Depositories, we can not decide with whom we can get our documents validated, Basically the purpose of these Depositories to check whether the documents that we provide are legitimate or not.
So when we get our account open on paper it would be mentioned with whom our documents are getting submitted so if its with NDSL then the stock falls under NSE and if it is CDSL then it is BSE.
Exceptions like CAM IPO since almost 67% were held with NSE and it is one of the promotors in this stock that is why it is not listed in NSE and only got listed in BSE.
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