Dematerialisation requirement enables shifting securities from trade for trade to rolling settlement subject to certified compliance and no other grounds. Shift from Trade for Trade Settlement to Normal Rolling Settlement is allowed where a company has connectivity with both depositories and at least fifty percent of non promoter holdings are dematerialised, certified by the Registrar and Transfer Agent or, if no RTA exists, by a practicing Company Secretary or Chartered Accountant; exchanges must ensure no other grounds for continued TFTS exist and report actions in regular development reports.