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June 14, 2026

Definition

Book Built Issue Categories

In a book-built IPO, the net offer is split into reserved portions for QIBs, non-institutional investors and retail investors.

Under SEBI ICDR Regulations, a standard book-built mainboard IPO reserves at least 50% of the net offer for QIBs, at least 15% for non-institutional investors (NIIs) and at least 35% for retail individual investors. Where the company qualifies only via the alternative route, the QIB portion rises to 75% and retail falls to 10%.

Unsubscribed shares in one category can, within rules, spill over to others. Eligible employees and existing shareholders may also have separate reserved quotas disclosed in the offer document.

Related terms

  • Qualified Institutional Buyer (QIB)A QIB is a large, sophisticated institutional investor — such as a mutual fund, bank, insurer or FPI — that is allotted a dedicated portion of an IPO.
  • Non-Institutional Investor (NII)An NII, often called an HNI, is an investor who applies for more than ₹2 lakh worth of shares in an IPO and falls outside the retail and QIB categories.
  • Retail Individual Investor (RII)An RII is an individual investor applying for up to ₹2 lakh in an IPO, who gets a reserved quota and can bid at the cut-off price.

Plain-English explainer from The Dispatch Investors Encyclopedia. General information, not financial advice.