Lock-in compliance: lead merchant bankers must certify stamping, depository notification and exchange disclosure prior to listing. Prescribed due diligence certificate requires lead merchant bankers to confirm that locked-in share certificates are stamped 'not transferable' with duration, that dematerialised locked-in shares have been notified to depositories, and that lock-in details were provided to stock exchanges before listing; it also requires certification that minimum promoters' contribution and any excess promoters' contribution are locked-in and that clause-specific lock-in provisions of the SEBI (Disclosure and Investor Protection) Guidelines, 2000 have been complied with.