Book Built vs Fixed Price IPO: Key Differences Explained

Book Built vs Fixed Price IPO: How Indian Companies Price Their Shares

When a company decides to go public, one of the first questions it must answer is deceptively simple: at what price should it sell its shares? India permits two distinct methods for arriving at that price, and understanding the difference matters because it changes exactly how you, as a retail investor, place your bid. In a fixed price issue, the company decides the price in advance and prints a single number in its offer document. In a book built issue, the company offers a price range and lets investor demand settle the final figure at the end of the bidding window. Almost every large mainboard IPO you hear about, from Bajaj Housing Finance to Hyundai Motor India, uses the book building route. Fixed price issues survive mostly in the smaller corners of the market. This article walks through how each method works, why the book building process has become the default, and what it all means when you sit down to apply.

What is a Fixed Price IPO

In a fixed price issue, the company and its merchant banker decide the exact price of each share before the IPO opens, and that price is disclosed upfront in the offer document. If the price is set at ₹90, every applicant applies at ₹90, and there is no bidding, no range, and no price discovery during the subscription window. The entire amount is blocked in your bank account through ASBA at the time of application, since the price is already known. One consequence of this simplicity is that investors cannot gauge institutional appetite in real time, because there is no live bidding data to watch. You either believe the price is fair and apply, or you do not. Demand for the issue only becomes visible through the overall subscription figures, not through a price that moves with interest. Fixed price issues tend to be used by smaller companies where a full book building exercise would be disproportionately expensive and slow.

What is a Book Built IPO

In a book built issue, the company does not commit to a single price. Instead, it publishes a price band with a floor price at the lower end and a cap price at the upper end, for example ₹120 to ₹144. Investors then place bids at any price within that band, and at the close of the bidding window the final issue price, known as the cut-off price, is determined by the weighted demand received across those levels. If demand is strong and most bids cluster near the top, the price is set at or close to the cap. If interest is lukewarm, the price settles nearer the floor. This is the mechanism SEBI introduced in India in 1995 to make pricing reflect genuine market demand rather than a number chosen by management. Because the final price is unknown until bidding closes, retail investors are given the option to bid at the cut-off price, meaning they agree in advance to accept whatever final price emerges. The maximum amount is blocked at application, and any excess is refunded once the price is fixed.

The Price Band Rules SEBI Enforces

The price band in a book built issue is not left entirely to the company. SEBI sets clear limits to keep the process honest. Under the ICDR Regulations, the cap price in a mainboard book built issue cannot exceed the floor price by more than twenty percent. So if the floor is set at ₹100, the cap cannot go beyond ₹120. This ceiling keeps the band tight enough that investors can meaningfully assess fair value rather than guessing across an enormous range. The price band, or at least the floor price, must be announced at least two working days before the issue opens, published in the same newspapers that carried the pre-issue advertisement, and it must be accompanied by the relevant financial ratios at both ends of the band so that you can judge valuation before committing. A company is permitted to revise the price band while the issue is open, but if it does, the bidding period must be extended to give investors time to reconsider. In a fixed price issue, by contrast, the price cannot be changed once the issue has opened for subscription.

Why Book Building Became the Default

The dominance of book building is not an accident, and the numbers make the case starkly. In 2024, book building was used by the large majority of IPOs and accounted for roughly ninety-seven percent of the total capital raised through public issues in India, while fixed price issues collectively raised a small fraction of that amount across a modest number of offerings. The reason is straightforward. Book building produces an efficient price discovery mechanism, it aligns the issue price with actual investor demand, it reduces the risk of large post-listing price shocks caused by mispricing, and it creates a transparent record of investor interest across categories. There is also a regulatory driver. A mainboard company that fails to meet SEBI's profitability eligibility norms cannot use the fixed price route at all. Such a company must issue through the book building process and allocate at least seventy-five percent of the net offer to Qualified Institutional Buyers. For any issuer of meaningful size, book building is therefore either the sensible commercial choice or an outright requirement.

Book Built vs Fixed Price: A Side-by-Side Comparison

The practical distinctions between the two methods are easiest to absorb in a single view. The table below summarises how each approach behaves across the points that matter most to a retail applicant.

Reading across the rows, the trade-off becomes clear. Fixed price is simpler and cheaper but blunt, offering no real price discovery. Book building is more expensive and takes longer to settle a final price, but it produces pricing that reflects genuine market appetite, which is precisely why regulators and large issuers favour it.

What This Means When You Apply

For most retail investors in India today, the practical reality is that you will almost always be applying to a book built issue, because that is what mainboard IPOs use. When you see a price band such as ₹120 to ₹144 for an issue, you have two sensible choices. You can bid at a specific price within the band, which is what larger investors often do to signal conviction, or you can select the cut-off price, which most retail investors choose because it maximises the chance of allotment by agreeing to pay whatever final price is set. The full amount at the cap price is blocked in your account through ASBA, and if the issue prices below the cap, the difference is unblocked and returned to you. If you ever encounter a fixed price issue, usually a smaller company, the process is even simpler, since there is only one price to apply at and no cut-off option to consider. In both cases, the discipline that matters is the same. Read the offer document, check the valuation at the price on offer, and decide whether the business is worth that price rather than being swayed by listing-day noise or grey market chatter.