easiest allows both trusted account & account of choice transfers
You can pledge to a broker if you have an arrangement with the broker that he’s going to give you margins against such pleldge, at Zerodha we don’t. We pledge all securities to Clearing Corporation after moving them from the client’s demat account to our collateral account (collateral account is permitted by the Exchanges to be opened for this specific purpose)
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After the Karvy episode, SEBI has barred brokers from pledging client securities with NBFCs.