Over subscription.
Over subscription is one of the essential deciding factors for investors particularly retail investors to decide whether to go for an IPO or not. Many of you think if an IPO is oversubscribed then there is a great demand for that IPO and financially sound, so you will subscribe assuming there will be listing gains. The assumptions on over subscription are not correct.
Because the shares offer on IPO is limited and allocation to each category of investors( QIB, NII, and Retail investors) is pre-decided. These days most of the time the number of applications made is surpassing the number of shares on offer. This may result in getting few or no shares you have applied for.