What is S1?

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IPO Process Library · 03 S-1 & SEC Disclosure

Last Updated | November 11, 2026

What Is an S-1?

The S-1 is the registration statement a U.S. company files with the SEC to sell shares to the public for the first time. Its core is the prospectus, the disclosure document investors use to decide whether to buy.

Key Takeaways

• The S-1 registers the offering under the Securities Act of 1933; the SEC reviews disclosure, not investment merit.
• It has two parts: Part I (the prospectus) and Part II (additional information and exhibits).
• A company usually submits drafts confidentially, then files publicly before the roadshow and amends as the SEC comments.
• The final prospectus is filed after pricing under Rule 424(b).

AnatomyFiling flowSEC's roleS-1 vs prospectusFAQRelated

What is inside the S-1

Section	What it tells you
Prospectus summary	The pitch in a few pages: business, key metrics, offering terms.
Risk factors	The risks management believes could hurt the business or the stock.
Use of proceeds	How the company intends to spend the money it raises.
Dividend policy and capitalization	Whether it pays dividends and its capital structure before and after the IPO.
Dilution	How much new investors' ownership is diluted relative to existing holders' cost.
MD&A	Management's explanation of results, trends, liquidity, and key metrics.
Business	Products, customers, market, competition, strategy, employees, and IP.
Management and compensation	Directors, executives, pay, and governance.
Principal stockholders and related parties	Who owns what and what insiders have with the company.
Underwriting	The banks, fees, lock-ups, and stabilization terms.
Financial statements	Audited annual and interim statements with notes.

From first draft to effectiveness

01

Draft submissionMany issuers submit a draft registration statement confidentially so the SEC can comment before details are public. The SEC has broadened access to nonpublic review in recent years; check current staff guidance.

02

SEC commentsStaff comments typically arrive within a few weeks of the first submission. The company responds and revises.

03

Public filingThe registration statement is filed publicly on EDGAR, at least 15 days before the roadshow begins for issuers that used nonpublic review.

04

Amendments (S-1/A)Each round of changes is filed as an S-1/A, including the price range once the underwriters set it.

05

Effectiveness and pricingAfter the SEC declares the registration effective, the deal prices and the final prospectus is filed under Rule 424(b).

What the SEC does and does not do

The SEC checks that required disclosures are present and not misleading on their face. It does not approve the business, validate the valuation, or guarantee the accuracy of the content. Issuers, directors, signing officers, auditors, and underwriters carry liability for material misstatements under Section 11 of the Securities Act, which is why S-1 language is cautious and heavily lawyered.

S-1 vs prospectus

The prospectus is Part I of the S-1 and is the document delivered to investors. Part II (exhibits, expenses, indemnification, recent unregistered sales) is filed on EDGAR but not printed in the investor copy. In practice, people say “S-1” and “prospectus” interchangeably.

Common questions

Do foreign companies file an S-1?

Many foreign private issuers file Form F-1 instead, which has similar disclosure content.

Is the S-1 the same as the final prospectus?

The final prospectus filed after pricing includes the offering price and share count, which earlier versions leave out or show as a range.

Keep Reading

How to Read an S-1Business, risk factors, MD&A, financials.Risk Factors in S-1How risk factors are drafted and read.Use of ProceedsWhat companies say they'll do with IPO money.SEC Review ProcessComments, amendments, S-1/A filings.Confidential SubmissionEGC confidential filing and benefits.What Is an IPO?Definition, purpose, and how an IPO creates a public company.

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