A private company files a registration statement with the SEC, typically on Form S-1. It then sells shares to public investors for the first time. That transaction, an initial public offering, turns the firm into a reporting company. It must then file quarterly and annual financial statements with the agency. The SEC's own guidance walks through every step.
Federal law controls the road to a first trade. A company may not lawfully offer or sell shares unless the deal is registered or an exemption applies. Underwriters, a prospectus and a negotiated price sit in between. Each one shapes what investors finally see. For related coverage, see How Tariffs Work And Who Actually Pays Them.
What Is an IPO?
An IPO is the first sale of a company's shares to public investors. The SEC describes it as the first time a company offers its shares of capital stock to the general public. The offering creates a trading market, usually through a listing on an exchange such as the New York Stock Exchange or Nasdaq.
How Does the Registration Process Work?
The company files a registration statement, typically Form S-1, with the prospectus at its core. SEC staff review the filing for gaps and often request revisions. Per the SEC's investor bulletin on IPOs, staff comment letters are posted on EDGAR no earlier than 20 business days after effectiveness.
Once staff comments are cleared, the SEC declares the statement effective. The company may then proceed with the sale. Per the same bulletin, so-called emerging growth companies phase in some disclosure rules for up to five years. That status generally applies while revenue stays below $1.235 billion.
Who Sets the Offer Price?
The company and its underwriters set the price together in the final days before trading. Underwriters gather indications of interest from large investors. The issuer weighs that order book against its own goal of raising capital. The final price appears in a prospectus filing, usually a Form 424B4, per the bulletin.
The interests at the table are not the same. A higher price lets the company raise more money. Underwriters earn fees as a share of the offering yet also want a price their clients will accept. The SEC notes that underpricing can produce a first-day bump while leaving the issuer with less capital than it might have raised. This connects to our earlier piece, How Corporate Share Buybacks Work — and Who Benefits.
What Happens After the First Trade?
The first close often sits far from the offer price. Per the SEC, it is not uncommon for the closing price shortly after an IPO to land well above or below the offering price. Underwriters can support the new stock for only a few days, and prices may sag once that support ends.
Insiders face their own clock. Many enter lock-up agreements that bar share sales for a set period, typically 180 days, per the SEC's bulletin. When that window closes, a wave of eligible shares can reach the market, and the added supply can pull the price down.
Can Individual Investors Buy IPO Shares?
Often only in small amounts. SEC investor materials say most shares in a sought-after deal flow to institutional and high-net-worth clients of the underwriting syndicate. Online brokers hold small allotments, so individual demand can exceed what those firms receive.
You can still study every filing. See the SEC's fast answer on why individuals have difficulty getting shares, which details the syndicate rules. Form S-1 and its amendments are public on EDGAR. The SEC advises checking that you read the latest version before the deal prices. The prospectus summary, the risk factors and the use of proceeds sections carry the core facts about the business.
Conclusion
An IPO blends law, negotiation and timing. A company registers with the SEC, underwriters build an order book, and a price emerges from competing goals. The first-day pop reflects scarce supply as much as strong demand, and lock-up expirations reshape the float within months. The filings, not the first-day headline, hold the durable record.
