BookbuildingABB
Bookbuilding is how underwriters collect orders from investors at different prices before an offering, then use that demand to set the final price and decide who gets shares.
Bookbuilding is how underwriters discover the price of a new share offering. They collect orders from investors, build a 'book' of demand, and use it to set the final price and allocations of an Initial Public Offering or follow-on deal.
- Category
- Fundamentals and Macroeconomics
- Reading time
- 3 min
- Also called
- Book-building, Book building, Accelerated bookbuild
- Updated
Bookbuilding in plain words
Bookbuilding is how underwriters measure investor demand for a new share issue and use it to decide how big the offering should be and what it should cost.1
Investors place orders with the banks saying how many shares they want and up to what price, and they identify themselves.2
The banks then advise the company on the final IPO price and on who gets how many shares.2 Rules differ by country.
How bookbuilding works
File and set a range
In the US, the company files a registration statement that includes a first estimated price range.1
Run the roadshow
Management goes on a roadshow, and that is when most orders come in.3
Collect orders
Each investor states a quantity, any price limit and who they are.2
Assess the book
Underwriters weigh order quality, size and price sensitivity.
Price and allocate
Once the book closes, the final price is set and shares are allocated.3
Start trading
Shares list on the Exchange and begin trading.
Worked examples
Example 1 — Oversubscribed IPO
Priced at $21A hypothetical IPO offers 10M shares at a $18–$20 range and receives orders for 40M.
| Shares offered | 10M |
| Demand | 40M |
| Cover | 4x |
Heavy demand lets the banks advise pricing at the top of the range or even above it.2
Example 2 — Weak book
DownsizedA hypothetical IPO at $18–$20 gets orders for only 8M of 10M shares.
| Offered | 10M |
| Demand | 8M |
| Cover | 0.8x |
Because book-building helps determine the size and pricing of an issue, the deal may be cut in size or priced below the range.1
Example 3 — Accelerated bookbuild
Done in hoursA hypothetical shareholder sells 5M shares overnight at a 4% discount.
| Shares | 5M |
| Discount | 4% |
| Time | Overnight |
For follow-on deals, an accelerated bookbuild can squeeze the whole process into a matter of hours.3
Bookbuilding vs fixed-price offering
| Aspect | Bookbuilding | Fixed price |
|---|---|---|
| Price set | After collecting demand | Before the offer |
| Price discovery | Strong | Weak |
| Allocation | Underwriter discretion | Often pro rata |
| Typical use | Large IPOs, follow-ons | Smaller offers |
Where bookbuilding is used
IPOs
Most large Initial Public Offering deals use it.
Follow-on offers
Companies raise more equity.
Block sales
Large holders sell via accelerated books.
Bond deals
Debt issues also build order books with a Broker syndicate.
Advantages and disadvantages
Advantages
- Improves price discovery.
- Lets issuers size the deal to demand.
- Gives underwriters control over the investor mix.
- Accelerated books are fast.
Disadvantages
- Allocations can favour big clients.
- Orders may be inflated.
- Pricing can leave money on the table.
- Process is opaque to retail investors.
Going deeper
Read as far as you need. Each level builds on the one before it.
What the book is
Beginner
The “book” is literally a list of orders, which underwriters use to judge real demand.1
The roadshow
Intermediate
Orders gathered on the roadshow decide the final price and how the shares are split among investors.3
Allocation power
Advanced
The banks advise on both price and allocation, so regulators watch for conflicts of interest in who gets shares.2 Rules differ by country.
Common mistakes
Reading oversubscription literally
Investors inflate orders expecting cuts.
Assuming a first-day pop
Weak books can trade below the offer.
Ignoring lock-ups
Insider sales can follow later.
Confusing with auctions
Bookbuilding uses discretion, not a pure auction.
Check your understanding
Test yourself before moving on. Each answer comes with an explanation.
Key points to remember
- Bookbuilding collects demand to set price and size.
- US IPOs start with an estimated price range.
- The roadshow builds the book.
- Underwriters recommend price and allocation.
- Accelerated books are done in hours.
Frequently asked questions
Can retail investors join the book?
Why is the price sometimes above the range?
Is bookbuilding the same everywhere?
Further learning
- Initial Public Offering
The main use of bookbuilding.
- Exchange
Where shares list.
- Liquidity
After-market trading.
- Market Capitalisation
Valuing the issuer.
Sources
This article is written in our own words. The sources below support the specific facts, rules and figures marked with a number in the text. Links open the original publisher’s page.
- SEC. Commission Guidance Regarding Prohibited Conduct in Connection with IPO Allocations (Release 33-8565) (opens in a new tab) Checked .
- Financial Conduct Authority. Occasional Paper 15: Quid pro quo? What factors influence IPO allocations to investors? (opens in a new tab) Checked .
- IOSCO. FR16/2018 Conflicts of interest and associated conduct risks during the equity capital raising process (opens in a new tab) Checked .
Educational content, not financial advice. Examples use hypothetical prices and simplified costs; actual fees, margin rules and regulations vary by broker, market and country. We are not affiliated with any publisher linked above. Last reviewed . Report an error or request a source credit.