Allotment procedure requires proportionate allocation within investor categories with minimum application-size and retail minimum bid-lot protections. Regulation 50 mandates allotment of specified securities on a proportionate basis within investor categories, rounded to the nearest integer and subject to a minimum allotment equal to the issuer disclosed minimum application size; a monetary cap applies to allotments under specified reservations. Retail individual investors must receive not less than the minimum bid lot where shares are available in that category, with any remaining retail shares allocated proportionately. The executive director or managing director of the designated stock exchange, together with post-issue lead merchant bankers and registrars, must ensure the basis of allotment is finalised fairly in accordance with Schedule XV.