Book Building
IPO Process Library › Roadshow & Book-Building
IPO Process Library · 06 Roadshow & Book-Building
Last Updated | November 11, 2026
Book-Building Explained
Book-building is how underwriters collect and organize investor orders during the roadshow to see how much demand exists at different prices. The resulting book guides the final price, share count, and allocation.
- The book records indications of interest, usually non-binding, by investor, size, and price.
- Demand at each price forms a curve that shows how far the deal can push on valuation.
- Quality of orders matters as much as quantity: long-term holders are favored over short-term traders.
- Bankers adjust for inflated orders and price-sensitive demand before recommending a price.
How the book is built
Reading the demand curve (hypothetical)
| Price | Orders at or above this price | Coverage of the deal |
|---|---|---|
| $18 | 45,000,000 shares | 4.5x |
| $20 | 32,000,000 shares | 3.2x |
| $22 | 18,000,000 shares | 1.8x |
| $24 | 9,000,000 shares | 0.9x |
In this example the book is well covered through $22 but falls short of full coverage at $24, so pricing near the top of the demand curve would be limited to the point where quality demand remains solid.
Quality over quantity
- Long-only funds that hold for years are generally preferred over short-term traders.
- Anchor and cornerstone orders signal conviction and provide stability.
- Inflated orders: some investors over-order to receive larger allocations, so bankers discount them.
- Price sensitivity: orders that drop off sharply above a certain price show where valuation resistance begins.
What the book decides
| Decision | How the book informs it |
|---|---|
| Final price | Where quality demand remains strong relative to the shares offered. |
| Deal size | Whether to upsize the share count or add a secondary component. |
| Allocation | Which investors get shares and how many. |
| Timing | Whether to price early, extend the roadshow, or postpone. |
Common questions
Is a book 'covered' the same as oversubscribed?
Covered means orders at least equal the shares offered. Oversubscribed means orders exceed the shares, often by a multiple.
Can orders change during the roadshow?
Yes. Investors can raise, lower, or cancel indications until pricing.
Methodology & Sources
Synthesizes SEC rules and guidance (Securities Act of 1933, Exchange Act of 1934, Regulation S-K), NYSE/Nasdaq listing standards, FINRA rules, and public S-1 filings. Cross-checked against primary documents. Rules, thresholds, and timelines change; confirm current requirements with counsel before acting. General education, not legal or investment advice.
Author: Erwin Castro
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