How IPOs Work: Process, Pricing, Timeline
How IPOs work: underwriter selection, S-1 filing, roadshow, bookbuilding, pricing, stabilization, and the quiet period. The ECM flagship deal end to end.
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An IPO takes a private company public in five stages: pick underwriters, file the S-1 registration with the SEC, market the shares on a roadshow while building the order book, price the night before trading, then stabilize the stock and observe a 25-day quiet period. CFI breaks the process into exactly those five steps. The catalog version takes three to four months from kickoff to listing day, though the final sprint from roadshow to pricing runs one to two weeks.
TL;DR
- Underwriters are picked and signed months before any public filing.
- The S-1 registers the business, financials, risks, and share count with the SEC.
- The roadshow builds the order book that sets the offer price.
- IPOs are usually underpriced, so first-day demand runs hot by design.
- A 25-day quiet period follows listing before analysts publish freely.
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How does a company prepare to go public?
Preparation starts with the syndicate. The company selects a lead bookrunner plus co-managers to spread risk and widen distribution, then signs engagement letters covering fees and the 15 percent overallotment option, per CFI. Lawyers and accountants join at once: audited financials get rebuilt to public-company standards, governance gets repaired, and the S-1 registration statement takes shape with the business description, financials, management backgrounds, risk factors, and ticker. Underwriting comes in three flavors: firm commitment, where the banks buy the whole issue; best efforts, where they sell what they can; and all-or-none, where the deal dies unless every share sells. Most large IPOs are firm commitments, which is why the banks diligence so hard before signing. For the desk that runs this deal, see our equity capital markets guide.
What happens on the roadshow?
The company and its bankers tour institutional investors for one to two weeks, pitching the equity story ten times a day while sales desks collect orders into the book. Nasdaq describes a typical five-to-nine-day run of management meetings where investors indicate interest for IPO day. The red herring prospectus, preliminary because it omits price and date, is the marketing document; the cooling-off rules limit what else the company may say. A book oversubscribed two to three times counts as a good IPO, per CFI, because that depth lets the banks price with confidence. Pricing happens the night before trading: the company and leads set the offer price and share count from the book, market conditions, and the company's funding goal.
| Stage | Typical window | What decides it |
|---|---|---|
| Underwriter selection | Months before filing | Distribution, sector record, fees |
| S-1 and SEC review | Six to twelve weeks | Disclosure quality, comment letters |
| Roadshow and bookbuild | One to two weeks | Investor demand in the book |
| Pricing | Night before listing | Book depth, market, funding goal |
| Stabilization | First trading days | Underwriter support bids |
| Quiet period | 25 days after listing | SEC rules, then research resumes |
Why are IPOs underpriced?
Deliberately, to make sure the deal clears. CFI is direct: IPOs are often underpriced so the issue is fully subscribed even if the company leaves money on the table. Underpricing compensates investors for buying an unproven public story, rewards the accounts that showed up in the book, and buys a stable aftermarket instead of a broken deal. The famous first-day pop is mostly this discount unwinding in public. Bankers also keep the 7 percent gross spread convention on many deals, split 20 percent to the lead, 60 percent as selling concession across the syndicate, and 20 percent for expenses, per CFI. After listing, the lead stabilizes the stock by buying into weakness, then the 25-day quiet period ends and covering analysts publish. The debt-side mirror runs faster and quieter: see how corporate bonds are issued.
Frequently Asked Questions
How long does the IPO process take?
Roughly three to four months from organizational kickoff to listing for a standard deal, per the classic timeline. The S-1 review takes the longest; the roadshow-to-pricing sprint is one to two weeks.
What is bookbuilding in an IPO?
Collecting investor orders during the roadshow to discover what the shares are worth. The book's depth and price sensitivity set the offer price the night before trading.
What is the greenshoe option?
The 15 percent overallotment option in the engagement letter, per CFI. It lets underwriters sell extra shares and buy them back to stabilize the price, which is the stabilization mechanism after listing.
Why does the quiet period matter?
For 25 days after the IPO, SEC rules restrict what the company and its underwriters may say publicly. Investors rely on the prospectus until research coverage resumes, which is why the filing has to stand alone.
What should I prepare for an ECM interview?
The standard technical stack plus genuine markets interest: recent IPOs, how they priced, and how they traded after. Our ECM guide lists the exact preparation, and the DCM comparison covers the debt side of the same markets skill set.
Sources
- Corporate Finance Institute, "IPO Process": https://corporatefinanceinstitute.com/resources/equities/ipo-process/ (checked September 2026)
- DFIN, "Navigating the IPO Process: Timeline for Going Public": https://www.dfinsolutions.com/knowledge-hub/thought-leadership/knowledge-resources/ipo-timeline-process (referenced via search, September 2026)
- Nasdaq, "How Nasdaq Supports the IPO Process": https://www.nasdaq.com/newsroom/how-nasdaq-supports-ipo-process (referenced via search, September 2026)
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