Yes, you can own more than one demat and trading account. There is no such restriction on how many demat accounts you can have. However, there may be with multiple brokers and firms. While you have the freedom to open many accounts, it is not a viable option. Every account has a cost in terms of annual maintenance charges (AMC), other costs which makes it uneconomical to have too many accounts. Also, you need to track so many accounts and that is cumbersome. This is because you would have to pay maintenance charges for each of these accounts, which may turn out to be a costly affair in the long run.