We would like to show you a description here but the site won’t allow us. Online Trading - Open Stock/ Share Market Trading Account | HDFC securities Ph: 022-691 51436, Email: [email protected]. KYC is one time exercise while dealing in securities 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. HDFC Securities has a proprietary trading desk. Make sure your Mobile number is linked to your Aadhaar number