IPO Bookbuilding Process: How Underwriters Price and Allocate Shares

Key Takeaways

• Bookbuilding is the four-stage process (S-1 filing, roadshow, pricing, allocation) by which underwriters determine the final IPO offer price.
• Average first-day IPO pops were $85 million during the 1999–2000 bubble, meaning issuers left that much money on the table per deal.
• Treating the preliminary price range as a firm forecast is wrong; hot deals routinely price above range and cold deals price below or get pulled.
• IPO allocations go almost entirely to institutional accounts, directly affecting your ability to buy shares at the offer price.

What It Is

Bookbuilding is the process by which an investment bank underwriting an IPO collects indications of interest from institutional investors, builds an order book at different prices, and uses that book to set the final offer price and allocate shares.

The mechanism dominates the US market. Alternatives such as Dutch auctions (used by Google in 2004) and fixed-price offerings exist but account for a tiny share of deals. The core workflow has four legs: filing, marketing, pricing, and allocation.

The Intuition

An issuer going public faces an information problem. It does not know what price the market will bear, and it does not know which investors will hold the stock versus flip it on day one. Setting the price too low leaves money on the table. Setting it too high leaves the deal undersubscribed and the stock falling on the first day.

Bookbuilding solves the problem by letting the underwriter poll real buyers at real prices before the stock exists in the public market. Institutions that see the roadshow give the bank a view of where the curve sits. The bank then picks a price below the clearing level so demand outruns supply on day one, producing a controlled pop rather than a collapse.

How It Works

The process runs in four stages.

1. Filing the S-1. The company files Form S-1 with the SEC on the EDGAR system. The S-1 discloses the business, financials, risk factors, management, and use of proceeds. The SEC reviews the filing and issues comment letters. The company responds by amending the S-1 until the staff is satisfied.

2. Roadshow. Once the S-1 is near final, the lead bookrunner takes management on a roadshow, typically one to two weeks of meetings with institutional investors. The preliminary prospectus (the red herring) includes a price range, for example $18 to $20 per share. Institutions give the bookrunner indications of interest at specific price points and share quantities.

3. Pricing. On pricing day, usually the afternoon before trading, the issuer and lead bank look at the order book. If demand is strong across the top of the range, the deal may price above range. If demand is soft, the deal may price below range, shrink in size, or be pulled. Pricing is a negotiation between issuer (wanting a high price) and underwriter (wanting an easy sale).

4. Allocation. Because demand usually exceeds supply, the lead bank decides who gets shares. This discretion is central to the business. Large long-only mutual funds and pension funds tend to get priority. Retail investors get a small slice, if any, through their broker's allocation. FINRA Rule 5130 restricts allocations to restricted persons such as industry insiders.

Worked Example

A software company files an S-1 with a proposed range of $20 to $22 and 10 million shares. The roadshow generates an order book of 120 million shares of demand at $22, implying 12 times oversubscription. The bookrunner raises the range to $23 to $25 and repolls. Final demand at $25 still clears 60 million shares.

The deal prices at $24, one dollar below the maximum clearing price. The next morning the stock opens at $32 and closes at $30. The first-day pop is 25 percent. With 10 million shares sold, the issuer left $60 million on the table ($30 minus $24, times 10 million). Loughran and Ritter documented that the average IPO left roughly $9 million on the table in their 1990-1998 sample, rising to $85 million during the 1999-2000 bubble.

Common Mistakes

1. Treating the price range as a forecast. The range is an anchoring device, not a prediction. Hot deals often price well above range; cold ones price below or are pulled. The range tells you where the bank started, not where the market is.

2. Assuming retail investors can buy at the offer price. Almost all IPO allocations go to institutional accounts with long-term relationships at the bank. Retail buyers usually access the stock only after trading opens, paying the opening price rather than the offer price.

3. Confusing first-day pop with success. A 50 percent pop means the bank priced low. The existing shareholders just handed a big check to the new buyers. Academic research by Loughran and Ritter suggests issuers tolerate this because of side benefits like research coverage and spinning of hot allocations to executives.

4. Ignoring the quiet period. US securities law restricts what the issuer and its bankers can say about the company during the marketing window. Founders who freelance in the press during this period create SEC headaches that can delay the deal.

5. Overweighting signed indications. Indications of interest are not binding orders. Buyers can and do shrink or pull their bids on pricing night, especially if the broader market turns against the sector that day.

Frequently Asked Questions

Q: What is the IPO bookbuilding process in simple terms? Bookbuilding is how an investment bank figures out what price investors will pay for a new stock. Before the IPO, the bank collects non-binding orders from institutions at different price levels, then sets the final offer price the night before trading begins based on where demand is strongest.

Q: How does the IPO bookbuilding process affect investment decisions? The price and allocation decisions made during bookbuilding determine whether you can buy shares at the offer price or only in the open market on day one. Retail investors almost never receive IPO allocations, so the first-day opening price, often well above the offer price, is the entry point most people actually face.

Q: What is a real-world example of the IPO bookbuilding process? When a software company ran its IPO with a $20–$22 range and received 120 million shares of demand at $22, the bookrunner raised the range to $23–$25. The deal ultimately priced at $24 and opened at $32, a 33 percent pop representing $80 million left on the table by the issuer.

Q: How can investors use knowledge of the bookbuilding process? Understanding that first-day pops mean money transferred from the issuer to early buyers helps investors evaluate whether the IPO was well priced. Watching the deal-size and price-range changes during marketing is a live signal of institutional demand before the stock trades.

Q: How is the IPO bookbuilding process different from a Dutch auction? In bookbuilding the bank retains full discretion over pricing and allocation, using the order book to negotiate a deal-clearing price below the equilibrium to produce a first-day pop. In a Dutch auction, all bids are aggregated and the clearing price is set mechanically at the level that sells all shares, giving the issuer maximum proceeds but removing bank control of the buyer list.

Sources

1. Latham & Watkins. "US IPO Guide." https://www.lw.com/en/insights-landing/admin/upload/SiteAttachments/lw-us-ipo-guide.pdf
2. Loughran, T. and Ritter, J.R. "Why Don't Issuers Get Upset About Leaving Money on the Table in IPOs?" The Review of Financial Studies. https://papers.ssrn.com/sol3/papers.cfm?abstract_id=243145
3. Wall Street Prep. "Form S-1: SEC Prospectus Filing." https://www.wallstreetprep.com/knowledge/s-1-filing-form-sec/
4. SoFi. "What Is IPO Book Building?" https://www.sofi.com/learn/content/ipo-book-building-process/

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.