What Is Underwriter?
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IPO Process Library · 04 Underwriters & Syndicate
Last Updated | November 11, 2026
What Is an Underwriter?
An underwriter is an investment bank that manages an IPO: advising on structure and valuation, preparing the company for investors, building the order book, and in most U.S. deals buying the shares from the company to resell to investors.
- Lead bookrunners run the deal; co-managers and the wider syndicate add distribution and research.
- Most U.S. IPOs are firm commitment: underwriters buy the shares and take on pricing and placement risk.
- Banks are paid a gross spread, often around 7% on mid-sized deals and lower on very large ones.
- A greenshoe option lets underwriters sell up to 15% more shares to stabilize the stock.
What underwriters do
- Advise on timing, structure, valuation, and the primary/secondary mix.
- Diligence: test disclosure and management claims alongside counsel to support their due-diligence defense.
- Market: prepare the roadshow, run investor meetings, and build the book of orders.
- Price and allocate shares with the company.
- Stabilize and cover the stock after trading starts, using the over-allotment option.
- Provide research and market-making after the IPO, subject to FINRA research rules.
Syndicate hierarchy
| Role | What it means |
|---|---|
| Lead left bookrunner | The bank listed first, usually on the left of the cover page. Leads pricing and has the largest economics and allocation. |
| Joint bookrunners | Share in running the book and in fees; typically also provide research. |
| Co-managers | Smaller roles; add distribution reach and sometimes sector coverage. |
| Selling group | Brokers who sell shares to their own clients under the lead banks' terms. |
Firm commitment vs best efforts
| Firm commitment | Best efforts | |
|---|---|---|
| Who bears risk | Underwriters buy the shares and resell them | Underwriters only try to sell; unsold shares are not their risk |
| Use | Standard for U.S. exchange-listed IPOs | Smaller or riskier offerings |
| Pricing | Set at pricing after book-building | Often fixed in advance, with minimum-raise conditions |
How underwriters are paid
The underwriting discount, or gross spread, is the difference between the price investors pay and what the company receives. Spreads are commonly cited around 7% for mid-sized U.S. IPOs and are lower in percentage terms for very large offerings. Banks also receive reimbursement of certain expenses, and the offering terms are reviewed by FINRA. The over-allotment option (greenshoe) typically covers up to 15% of the base deal and is exercisable for 30 days.
How a company picks underwriters
Common questions
Do underwriters guarantee the stock price?
No. They commit to buy and place the shares at the IPO price, but the after-market price is set by trading.
Can the company negotiate the spread?
Yes, in part, and deal size, competition among banks, and the number of banks involved all influence it.
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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