What Is an S-1 Filing? How to Read a US IPO Prospectus
What an S-1 filing is, who files it, and how to read each section of a US IPO prospectus: summary, risk factors, use of proceeds, dilution, MD&A and financials.
An S-1 filing is the registration statement a US company files with the Securities and Exchange Commission (SEC) to sell shares to the public for the first time. It contains the prospectus: the document describing the business, its risks, its finances and the terms of the offering. Foreign companies use Form F-1, and real estate investment trusts use Form S-11. The final version, with the price, is filed after pricing as a 424B4.
This guide explains where an S-1 fits in the IPO process and walks through its sections in the order they usually appear.
S-1, S-1/A, F-1 and 424B4: which is which?
| Filing | What it is | When |
|---|---|---|
| DRS | Draft registration statement, reviewed confidentially | Months before the IPO |
| S-1 | Registration statement for US companies | Public filing, at least 15 days before the roadshow |
| F-1 | Registration statement for foreign private issuers | Same stage as the S-1 |
| S-1/A | Amendment: answers SEC comments, adds the price range | Any time before effectiveness |
| 424B4 | Final prospectus with the price and share count | Right after pricing |
The full sequence, from confidential filing to the first trade, is in how a US IPO works.
How to read an S-1, section by section
Cover page and prospectus summary
The cover shows the number of shares, the expected price range (in later amendments), the exchange and proposed ticker, and the underwriters. The prospectus summary gives a few pages on the business, key metrics, the offering and summary financial data. Start here.
Risk factors
Often 20 to 60 pages, listing the risks the company considers material: competition, customer concentration, regulation, losses, dual-class voting, and more. Company-specific risks are more informative than the generic ones at the end.
Use of proceeds
How the company plans to use the money it raises, such as working capital, repaying debt or acquisitions. If existing stockholders sell shares, the company doesn't receive that part.
Capitalization and dilution
Capitalization shows cash, debt and equity before and after the offering. Dilution shows the gap between the IPO price and the net tangible book value per share. New investors usually pay more per share than the book value of what they receive.
Management's discussion and analysis (MD&A)
Management explains revenue, costs, profitability, cash flow and key operating metrics over recent periods, and what drove the changes. It's one of the most useful sections for understanding the business model.
Business
What the company does, its products, customers, market, competition, intellectual property, employees and facilities.
Management, executive compensation and principal stockholders
Directors and executive officers, how they are paid, and who owns the shares before and after the offering, including any selling stockholders. Multiple share classes with different voting rights are explained here and in "Description of capital stock".
Shares eligible for future sale and underwriting
How many shares can be sold after the IPO and when, including lock-up agreements (most often 180 days). The underwriting section names the banks, the underwriting discount and the over-allotment option, usually up to 15% more shares.
Financial statements
Audited financial statements with notes, at the back of the document (the "F-pages"). Smaller "emerging growth companies" may show two years of audited financials instead of three.
Where to find an S-1 filing
- SEC EDGAR: search by company name on EDGAR and filter the filing type to S-1, F-1 or 424B4.
- Eyepio: US IPO pages are built from the final prospectus and link to the filing. Browse the upcoming US IPOs, the US IPO calendar, or listings by exchange such as Nasdaq and NYSE.
What an S-1 doesn't tell you
- The final price until the 424B4 is filed, only a range in later amendments.
- How shares are allocated among investors, which underwriters decide.
- How the stock will trade. The opening price is set by the exchange's opening auction on the first day.
Frequently asked questions
What is an S-1 filing?
The registration statement a US company files with the SEC to register shares for an initial public offering. It includes the prospectus with the business description, risk factors, financial statements and offering terms.
What is the difference between an S-1 and an F-1?
The S-1 is for US companies; the F-1 is for foreign private issuers listing in the US. The content is similar, and F-1 filers may present financials under IFRS.
Does an S-1 filing mean the IPO will happen?
No. A company can delay or withdraw its registration statement, for example because of market conditions. Some S-1s are withdrawn without an IPO.
What is a 424B4?
The final prospectus filed under SEC Rule 424(b)(4) after the IPO is priced. It includes the IPO price, the final number of shares and the net proceeds.
Is an S-1 filing public?
The public S-1 is, on EDGAR. Many companies first submit a confidential draft registration statement, which becomes public only when the company files publicly, at least 15 days before its roadshow.
- #s-1
- #f-1
- #prospectus
- #sec
- #edgar
