"Promoters of issue of IPO/FPO have to file Draft Red Herring Prospectus (DRHP) and the IPO/FPO process remains open for 3-4 days, however the OFS process is completed over single trading day.

IPO/FPO consists of Price band as declared in prospectus and investor has to bid within the specified range, whereas OFS provides for a minimum bid price known as floor price, below which an investor will not be allowed to place bid.

IPO/FPO has restriction of 3 bids. OFS does not generally have restriction on number of bids."