Dematerialisation requirement ensures shift to rolling settlement when non-promoter holdings are dematerialised and certified by registrar. Shifting securities from the Trade-for-Trade Segment to Rolling Settlement requires both depository connectivity and that at least 50% of non-promoter holdings be dematerialised. The issuer must submit a certificate from its Registrar and Transfer Agent, or from a practising company secretary/chartered accountant if no separate RTA exists. Stock exchanges must ensure there are no other grounds for continuation in Trade-for-Trade before shifting and report the action taken in the prescribed development report.