What Does ‘Book Building’ Mean in an IPO?

Book Building Definition

Book building is a process companies and their investment bank advisers use to determine the final price of an IPO, based on actual demand from institutional investors, rather than simply picking a fixed price in advance. It’s one of the most common IPO pricing methods used globally, including on exchanges like the London Stock Exchange and, for some large offers, the NGX.

How the Book Building Process Works

The process typically starts with the company and its advisers setting an indicative price range, published in a preliminary prospectus. Institutional investors then submit bids indicating how many shares they’d buy at various prices within (or sometimes outside) that range, over a set marketing period. Advisers compile this demand into an “order book,” and use it to set a final offer price that balances strong demand against the company’s fundraising goals — setting the price too high risks under-subscription, while too low leaves money on the table.

Airtel Africa’s 2019 London listing is a real example: the company set an indicative price range (80–100 pence per share), ran a book-building process among institutional investors, and ultimately priced the offer at the low end (80 pence), reflecting actual investor demand at the time.

Would Dangote’s IPO Use Book Building?

As of this writing, Dangote Petroleum Refinery has not published a prospectus confirming its exact pricing methodology, so we can’t say for certain whether it will use a formal book-building process, a simpler fixed-price offer, or another structure. Given the scale of the deal and the international investor interest it’s likely to attract, book building (or something similar) would be a reasonably common approach for an offer of this size — but that’s an informed expectation based on how comparably large IPOs are typically structured, not a confirmed fact about Dangote’s specific offer.