Majority of non promoter holdings in dematerialized form enables shift from trade for trade to rolling settlement, certificate required. Securities of companies that have established connectivity with both depositories may be shifted from Trade for Trade Settlement to Rolling Settlement if at least half of other-than-promoter holdings are dematerialized, supported by a certificate from the Registrar and Transfer Agent or, if no RTA exists, from a practising Company Secretary or Chartered Accountant, and provided there are no other grounds for continuing Trade for Trade Settlement; stock exchanges must report actions in Monthly/Quarterly Development Reports to SEBI.