What is a Form S-1 registration statement?

The Securities Act of 1933 says securities offered to the public must be registered with the SEC unless an exemption applies. Form S-1 is the general registration form. Because it is the form most companies use for an initial public offering, “filed an S-1” has become shorthand for “is going public”.

What does an S-1 contain?

An S-1 has two parts. Part I is the prospectus, the document investors receive. It includes a summary of the business and the offering, risk factors, the use of proceeds, dilution, the capitalization table, management’s discussion and analysis, a description of the business and management, executive compensation, principal shareholders, and audited financial statements. Part II contains information that does not have to be delivered to investors, such as offering expenses, indemnification of directors and the list of exhibits.

For an IPO, the first public S-1 often leaves the price range and share count blank. Those details are added in a later amendment shortly before the roadshow.

How does SEC review work?

The SEC’s Division of Corporation Finance reviews the registration statement and sends comment letters. The company answers by filing amendments, which appear on EDGAR as S-1/A. Comment letters and responses are later made public on EDGAR as form types UPLOAD and CORRESP. Many issuers first submit a draft registration statement confidentially, which the SEC’s “Going Public” resource describes as available to all issuers; the draft must be publicly filed before the offering is marketed, generally at least 15 days before a roadshow begins.

When review is complete, the company asks the SEC to declare the registration statement effective. Only then can shares be sold under it. The final prospectus with the offering price is filed under Rule 424(b), usually as form type 424B4 for an IPO.

S-1 versus S-3, S-4 and S-8

The docket shows several related registration forms. They differ by purpose and eligibility:

Form	Used for
S-1	General registration, including IPOs and companies not eligible for S-3
S-3	Short-form registration for established reporting companies, often a “shelf” for future offerings
S-3ASR	Automatic shelf registration for well-known seasoned issuers, effective immediately on filing
S-4	Securities issued in a merger, acquisition or exchange offer
S-8	Shares offered to employees under benefit or equity compensation plans

Form S-3 is shorter because it incorporates the company’s existing Exchange Act reports by reference instead of repeating them. Eligibility requires, among other things, that the company has been reporting for at least 12 months and has filed its reports on time. Large companies on our docket file S-3ASR shelves and S-8s far more often than S-1s, which is why the table below may show those forms.

What should you read first in an S-1?

Start with the prospectus summary and the risk factors, then read “Use of Proceeds” to see what the money is for and “Dilution” to see how much new investors pay relative to the book value per share. The principal shareholders table shows who controls the company before and after the offering. For a company with dual-class shares, the description of capital stock explains the voting rights of each class.

The EDGAR search guide explains how to follow an S-1 through its amendments and find the final prospectus.