Dematerialisation requirement enables shifting securities from trade for trade to rolling settlement once compliance and certification are met. Companies with connectivity to both depositories may be shifted from the Trade for Trade Segment to the Rolling Segment if at least one-half of non promoter holdings under the listing agreement are in dematerialised form, evidenced by a certificate from the Registrar and Transfer Agent or, if no RTA, from a practicing company secretary or chartered accountant, and if there are no other grounds for continuation in the Trade for Trade Segment. Stock exchanges must report actions taken in their periodic development reports.