Post-issue merchant banker obligations require monitoring investor grievance redressal and ensuring timely post-issue disclosures and completion of allotment and refunds. Post-issue merchant bankers must execute and remain responsible for all post-issue functions disclosed in the offer document, including refunds, allotment and delayed-payment interest; monitor investor grievance redressal for allotment and refunds as specified by the Board; ensure publication within ten days after post-issue completion of detailed advertisements on oversubscription, basis of allotment, application and allottee statistics, refund and certificate dispatch dates and filing of the listing application; prevent publication about oversubscription or investor response while the issue is open; and remain responsible until demat credits or refunds are completed and listing permission is obtained.