How Does the IPO Book-Building Process Work in India? Price Bands, Bidding & Allotment

In the Indian capital markets, the book-building process is the primary mechanism through which companies discover the true market value of their equity shares before listing on the BSE and NSE. Governed by SEBI (Issue of Capital and Disclosure Requirements) Regulations, book building ensures fair price discovery driven by institutional and retail demand.

Fixed Price Issue vs. Book-Building Issue

Historically, public issues operated under two distinct models:

• Fixed Price Issue: The issuer and merchant bankers set a rigid offer price upfront (e.g. exactly ₹150 per share). Investors either bid at that price or abstain.
• Book-Building Issue: The issuer provides a Price Band (e.g. ₹380 to ₹400). Investors submit bids indicating the quantity of shares and price they are willing to pay within this corridor. Over 98% of contemporary Indian IPOs use book building.

Understanding Price Bands: Floor Price & Cap Price

Under SEBI ICDR regulations, the difference between the Floor Price (lower end) and the Cap Price (upper end) cannot exceed 20%. In practice, most Indian mainboard issues utilize a tight 3% to 5% spread.

For example, in an issue priced at ₹475–₹500, ₹475 is the Floor Price and ₹500 is the Cap Price. To stay updated with ongoing price bands, explore our IPO Calendar Schedule.

The “Cut-Off Price” Mechanism for Retail Investors

One of the most critical decisions for a retail applicant is whether to bid at a specific price or select the Cut-Off Price checkbox on their ASBA / UPI form:

• Selecting Cut-Off: Signals to the registrar that you agree to pay whatever final price is discovered at the end of the bidding period (which almost always equals the Cap Price in oversubscribed issues).
• Bidding below Cap Price: If an issue is oversubscribed and settles at the Cap Price (e.g. ₹500), any bids submitted at ₹480 or ₹490 are automatically rejected from allotment. Retail investors are therefore strongly advised to always select “Cut-Off Price”.

How the Final Issue Price is Discovered

When the bidding window closes (usually at 5:00 PM on Day 3), the Book Running Lead Managers (BRLMs) compile the consolidated order book from BSE and NSE. The final issue price is determined at the highest price where 100% of the offered shares find valid buyers.

Frequently Asked Questions

Why should retail investors always bid at the cut-off price?

Bidding at the cut-off price ensures your application remains valid regardless of where the final issue price settles. Bids below the final discovered price are automatically disqualified.

How long is the typical IPO book-building bidding window open?

Under SEBI regulations, an IPO book-building issue must remain open for a minimum of 3 working days and a maximum of 10 working days (typically 3 days for Indian mainboard issues).

Can an investor modify or cancel their bid during book building?

Retail and Non-Institutional Investors (sNII/bNII) can modify or cancel their bids while the issue window remains open. Qualified Institutional Buyers (QIBs) are prohibited from canceling bids once submitted.