An S-1 is the registration statement a U.S. company must file with the SEC before it can sell shares to the public for the first time. It discloses the business, its financials, risk factors, how the proceeds will be used, and who the major shareholders are. Companies often amend it (filed as S-1/A) as terms firm up before the offering prices — the original S-1 is usually the more substantive document, since amendments are frequently narrow restatements of one section.
It's the earliest public signal that a company is planning to go public, often filed months before a price is even set — which makes it the primary source for researching a deal before any bank commentary or news coverage exists: revenue, growth, ownership structure and risk factors are all in there. Because SEC review can take multiple rounds, the S-1 you read on day one may differ meaningfully from the final version, so always check the filing date and amendment number before relying on a specific figure.
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