Post-issue advertisement obligations require clear disclosure of allotment, oversubscription and dispatch details and ban premature oversubscription claims. The post-issue merchant banker must ensure prompt release of an advertisement containing oversubscription details, basis of allotment, number, value and percentage of all applications and successful allottees including ASBA, dates of dispatch of refund orders or instructions to Syndicate Banks by the Registrar, date of dispatch of certificates and date of filing of the listing application in specified English, Hindi and regional newspapers where the issuer's registered office is situated; and must ensure no party connected with the issue publishes advertisements claiming oversubscription or indicating investor response while the issue remains open.