Attention Investors Demat : Prevent unauthorized transactions in your Demat account. Update your Mobile Number with your Depository Participant. Receive alerts on your Registered Mobile for all debit and other important transactions in your Demat account directly from NSDL on the same day – issued in the interest of investors" KYC – "KYC is one time exercise while dealing insecurities markets. Once KYC is done through a SEBI registered intermediary (broker, DP, Mutual Fund etc.), you need not undergo the same process again when you approach another intermediary