Dematerialisation requirement: majority of non promoter holdings must be dematerialised before shifting securities to rolling settlement. Companies with connectivity to both depositories may be moved from Trade for Trade Settlement to Rolling Settlement only if a majority of non promoter holdings are dematerialised, evidenced by a certificate from the Registrar and Transfer Agent or, lacking a separate RTA, from a practicing Company Secretary or Chartered Accountant, and provided there exist no other reasons to continue TFTS; stock exchanges must report action taken in their Development Reports.