Listing pursuant to public issue requires specified allocations between institutional and non institutional investors, with disclosure and allotment limits. Regulation 106ZA requires filing a draft offer document with prescribed fees, fixes a minimum application size and number of allottees, and allocates the net public offer between institutional and non institutional investors with undersubscription of the non institutional portion available to institutional investors. Institutional allotment may be discretionary (with prior disclosure of mode and an institutional cap) while non institutional allotment must be proportionate. The offer document must disclose the broad objects and may include non projection disclosures supporting the basis of issue price with appropriate cautions.