Beneficiary Owner Identification Number (BO ID)

The Beneficiary Owner Identification Number (BO ID) is a unique 16-digit numeric code assigned to each Demat account holder — the beneficial owner of securities — by the depository (CDSL or NSDL) through their respective Depository Participant (DP). The BO ID serves as the primary identifier for a Demat account and is used for all securities transactions including buying and selling of shares, IPO allotments, corporate action credits, inter-depository transfers, and pledge creation. In CDSL's system, the BO ID is a 16-digit number combining the DP's 8-digit identifier with an 8-digit client-specific number. In NSDL's system, the equivalent identifier is formatted differently — typically as a combination of the DP ID (IN followed by 6 digits) and the client ID (8 digits). Investors require their BO ID when: applying for IPOs through the ASBA mechanism (where the Demat account for allotment is specified), participating in rights issues, receiving off-market share transfers, and completing KYC for new financial accounts. The BO ID is printed on the Demat account statement issued by the DP and is accessible through the DP's online portal or CDSL's and NSDL's investor portals.