Dematerialization requirement enables shifting securities from trade-for-trade to rolling settlement upon majority demat holdings and certification. Shifting securities from Trade-for-Trade Settlement to normal Rolling Settlement is permissible where companies have connectivity with both depositories and at least half of non promoter holdings are in dematerialized mode, certified by the RTA or, if no separate RTA exists, by a practicing Company Secretary or Chartered Accountant; exchanges must ensure no other grounds exist for maintaining Trade for Trade and report the action in the Monthly/Quarterly Development Report.