Dematerialization requirement for shifting to rolling settlement - non-promoter holdings must be dematerialized before shift. Stock exchanges may shift trading in securities of companies with connectivity to both depositories from Trade for Trade Settlement to normal Rolling Settlement only if at least 50% of the shareholding other than promoter holdings is in dematerialized mode, supported by a certificate from the company's RTA or, if no RTA exists, a practicing Company Secretary/Chartered Accountant, and provided there are no other grounds for continuation of TFTS; exchanges must report action taken to the regulator in Monthly/Quarterly Development Reports.