Reviewed on 24 Oct 2026 · Source: IPO Bulletin explainer; checked against SEBI ICDR Regulations 2018 (as amended) and exchange bidding guidelines
A bid is an investor’s offer to buy a specified number of shares in an IPO at a price within the announced price band. In a book-built issue, you submit a bid through your broker, your bank’s net banking or a UPI-enabled app, stating the quantity in lots and either a specific price or the cut-off option. A bid can be revised upward or downward, or cancelled, while the issue is open, and a revised bid replaces the earlier one. Each bid is recorded in the exchange’s order book, and the totals across all prices form the book from which the final price is discovered. The amount blocked for a bid is the number of shares multiplied by the highest price at which you bid, so bidding at the cap blocks the largest sum. If the final price is lower, the extra is released. Only one bid per category per PAN is generally allowed, with bids from the same PAN in the same category treated as duplicates. Bids placed by retail investors on the last day are accepted until the exchange cut-off, typically 5 pm, though UPI approval for the mandate needs to be completed within the same window.
Example: You place a bid for 2 lots of 100 shares at the cap price of Rs 150. Rs 30,000 is blocked. If the final price is Rs 145, Rs 29,000 is debited on allotment and Rs 1,000 is released.
A price band is the range, with a lower limit (floor) and an upper limit (cap), within which investors may bid for shares in a book-built IPO. The company and its lead managers announce the band in the price band advertisement, usually a few working days before the issue opens, and the Red Herring Prospectus carries the same range. The final issue price is discovered through bidding and is fixed inside this range, so it can never be higher than the cap or lower than the floor. Under SEBI rules the cap should not exceed 120 percent of the floor price, which keeps the range reasonably tight. Retail investors normally bid at the cap or at the cut-off price so that their bid stays valid whatever the final price turns out to be. The band matters because it sets the maximum money you must keep blocked in your bank account: lot size multiplied by the cap price. Companies can revise the band during the issue, but that requires public notice and an extension of the bidding period by at least three working days. Fixed-price issues do not have a band; they have a single price.
A bid is an investor's offer to buy a specified number of shares in an IPO at a price within the announced price band. In a book-built issue, you submit a bid through your broker, your bank's net banking or a UPI-enabled app, stating the quantity in lots and either a specific price or the cut-off option. A bid can be revised upward or downward, or cancelled, while the issue is open, and a revised bid replaces the earlier one. Each bid is recorded in the exchange's order book, and the totals across all prices form the book from which the final price is discovered. The amount blocked for a bid is the number of shares multiplied by the highest price at which you bid, so bidding at the cap blocks the largest sum. If the final price is lower, the extra is released. Only one bid per category per PAN is generally allowed, with bids from the same PAN in the same category treated as duplicates. Bids placed by retail investors on the last day are accepted until the exchange cut-off, typically 5 pm, though UPI approval for the mandate needs to be completed within the same window.
Allotment is the step after an IPO closes in which the company decides who receives shares and how many. Once bidding ends, the registrar prepares the basis of allotment, which explains how the shares were shared between categories and applicants. If an issue is not oversubscribed in a category, most valid applicants get what they asked for. If it is oversubscribed, shares are rationed. In the retail category, successful applicants are chosen by a computerised lottery and each winner usually receives one lot, because the demand is far larger than the supply. Larger categories receive shares in proportion to their bids. After allotment, shares are credited to the demat accounts of successful applicants, and money for unsuccessful applications is released from the ASBA block. SEBI requires the whole process, from issue close to listing, to be completed within three working days. You can check your allotment status on the registrar's website using your application number, PAN or demat details, and on the exchange page for the issue.
Worked example
You place a bid for 2 lots of 100 shares at the cap price of Rs 150. Rs 30,000 is blocked. If the final price is Rs 145, Rs 29,000 is debited on allotment and Rs 1,000 is released.
