Filing of offer document: pre-filing and Board observation requirements govern public and rights issues prior to registration. Issuers of public or rights issues meeting the regulation's threshold must file a draft offer document and prescribed fees with the Board through the lead merchant banker at least thirty days before registration or filing; the Board may issue observations within thirty days from specified events, and issuers and lead merchant bankers must comply with those observations prior to registering the prospectus or filing the letter of offer. The issuer must simultaneously file a copy of the final prospectus or letter of offer with the Board through the lead merchant banker, the lead merchant banker must file copies with recognised stock exchanges, and a soft copy must be furnished to the Board as specified in Schedule V.