Dematerialization requirement enables move from trade-for-trade to rolling settlement when non promoter holdings are dematerialized and no other grounds exist. Stock exchanges may shift securities that have established connectivity with both depositories from trade for trade to normal rolling settlement if at least fifty percent of non promoter holdings are dematerialized, evidenced by a certificate from the Registrar and Transfer Agent or, if none exists, from a practicing company secretary or chartered accountant, and provided there are no other grounds for continuation of trade for trade; exchanges must report action taken in the Monthly/Quarterly Development Report.