‘Shut period’ means the period for which the securities can not be delivered. During the period under shut, no settlements/ delivery of the security which is under shut will be allowed. The main purpose of having a shut period is to facilitate servicing of the securities viz., finalizing the payment of coupon and redemption proceeds and to avoid any change in ownership of securities during this process. Currently the shut period for the securities held in SGL accounts is one day. For example, the coupon payment dates for the security 6.49% CG 2015 are June 8 and December 8 of every year. The shut period will fall on June 7 and December 7 for this security and trading in this security for settlement on these two dates is not allowed.