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Initial Public Offering (IPO)

An initial public offering is the first sale of a company's shares to the public. It is a primary sale, so the money raised goes to the company or to shareholders selling alongside it, and the shares offered at the offering price are allocated by the underwriters rather than sold to whoever asks first.

Last reviewed by Steven Fox, CFP®, EA on

Quick Summary

  • The SEC describes an IPO as when a company first sells its shares to the public. The company registers the offering and publishes a prospectus, which is free to read on EDGAR.
  • Almost no individual investor buys at the offering price. The SEC says underwriters have wide latitude in allocating shares, that it does not regulate how they are allocated, and that most underwriters target institutional or wealthy investors.
  • The practical consequence is that a retail buyer on the first day is buying in the secondary market at whatever price is available, not at the offering price. The gap between the two is what people mean by an IPO pop.
  • The SEC declaring a registration statement effective is not approval of the company or of the offering, and the agency says so in terms.
  • A newly public company has no prior reporting history, a limited supply of tradable shares, and insider lock-up agreements that expire later. Each of those affects the early price in ways that have nothing to do with the business.

Definition

An initial public offering is the transaction in which a private company first sells shares of its stock to the public and lists them on an exchange. The Securities and Exchange Commission's investor glossary puts it plainly, saying an IPO "generally refers to when a company first sells its shares to the public." Under the federal securities laws a company may not lawfully offer or sell those shares unless the transaction is registered with the SEC or an exemption applies, so the offering is preceded by a registration statement, typically on Form S-1, most of which is the prospectus.

The word that carries the weight is "public." An IPO is a primary market transaction, which the SEC defines as one in which newly issued securities are sold to investors and the issuer receives the proceeds. Every purchase afterward happens in the secondary market, where existing shares change hands between investors and the company receives nothing. That distinction is what separates an IPO from any later purchase of the same stock, and it is why the two transactions have almost nothing in common beyond the ticker.

Advanced Explanation

Who actually gets shares at the offering price, and why it is very unlikely to be an individual. This is the part of the subject that most affects an ordinary reader, and the SEC states it without hedging. The underwriters and the issuing company control the process and "have wide latitude in allocating IPO shares," and "the SEC does not regulate the business decision of how IPO shares are allocated." Shares are distributed through an underwriting syndicate whose members do not receive equal allocations, the split between institutions and individuals is decided before trading starts, and, in the agency's own words, "most underwriters target institutional or wealthy investors in IPO distributions." When an offering is in heavy demand, underwriters "usually offer those shares to their most valued clients." Several online brokers do offer IPO participation, but the SEC notes they often have only a small allotment, so an individual's ability to buy at the offering price is limited whichever firm they use.

So the retail decision is almost never the one being described. There are two ways to buy into a new public company. The first is to be an underwriter's client and buy at the offering price. The second, which the SEC calls more common for individual investors, is to buy the shares when they are resold in the public market in the days that follow. Those are different prices and different bets. The SEC warns that the offering price "may bear little relationship to the trading price," that it is "not uncommon for the closing price of the shares shortly after the IPO to be well above or below the offering price," and that underwriters can support the trading price in the first few days with their own buying, after which "the stock price may decline significantly below the offering price."

The registration is public, free, and more informative than anything else available. A company undertaking an IPO files its Form S-1, and its amendments marked S-1/A, on the SEC's EDGAR database, followed by a final prospectus usually identified as a 424B3 or 424B4 filing that carries the settled offering terms. For a company with no reporting history, the SEC observes that the information capable of informing a decision "often can only be found in the prospectus." That is a rare situation in investing: the single most useful document exists, is written under liability for its accuracy, and costs nothing to read.

What the SEC's involvement does and does not mean. Staff review the registration statement for compliance with disclosure requirements and frequently require revisions. When the review is complete the staff issues an order declaring the statement effective. The agency is explicit that this "does not represent an approval of the merits of the IPO or an indication that the information disclosed is complete or accurate," and that the staff does not evaluate the merits of any offering. Effectiveness is permission to sell, not a verdict on the company.

Three supply facts that move the early price and have nothing to do with the business. The shares trading on the first day are generally only the shares sold in the offering. Other outstanding shares are often held by founders, employees and early investors and cannot be sold yet, either because they are restricted securities or because their holders have signed lock-up agreements, which the SEC says most commonly run 180 days and which must be disclosed in the registration documents. Underwriter policies that discourage flipping, the practice of immediately reselling allocated shares, restrict the float further. The SEC describes the combined effect as market overhang, and notes both that limited supply against high demand can drive the price steeply up and that the price may decline over time as restricted shares become available, sometimes sharply when a lock-up expires and a large block becomes sellable at once.

A detail worth checking in any prospectus you read. Some offerings include shares held by existing owners, described as selling shareholders, who may include founders and management. The SEC notes that the proceeds from those sales go to the selling shareholders rather than to the company. The cover page discloses how many shares they are selling, and a later section discloses how many each of them holds before and after. A large insider sale is not by itself damning, but it is a fact about the transaction that the registration statement is required to make available.

Two adjacent routes to a listing, named only to keep them apart. A direct listing places existing shares on an exchange without a capital-raising offering, and a merger with a special purpose acquisition company reaches a listing by a different mechanism again. Neither is an initial public offering in the sense used here, and each carries its own disclosure.

How to Remember

The offering price is a wholesale price paid by invited buyers. By the time the shares reach a screen the ordinary investor can trade on, they are being sold at retail by whoever bought them first.

Used in a Sentence

“Priya read the prospectus on EDGAR the week before the initial public offering, then noticed that the shares opened at a third above the offering price she had been quoting to herself.”

How It Works

The company files a registration statement with the SEC and circulates a preliminary prospectus. Underwriters collect indications of interest from the investors they solicit, build an order book of how many shares each would take and at what price, and recommend a price to the company, which sets it. The SEC declares the registration statement effective, the shares are allocated to the underwriters' clients at the offering price, and trading begins on an exchange the next morning. From that moment every transaction is between investors.

A hypothetical illustration of why the offering price is not a price most people can pay. A company prices its offering at $18.00 a share. Allocated buyers pay $18.00. When trading opens the following morning the shares change hands at $27.00, and Marcus, who has no allocation, buys 200 shares there for $5,400 plus any fees. The $9.00 difference is a 50% gain for the allocated buyer and nothing at all for Marcus, whose cost basis is $27.00.

Suppose the price then settles at $20.00 over the following weeks. The allocated buyer is up $2.00 a share, or about 11%. Marcus is down $7.00 a share on his $27.00 basis, or about 26%, on exactly the same company over exactly the same period. Neither outcome says anything about whether the business is any good. All figures are illustrative.

Pros and Cons

Pros

  • The prospectus is the most detailed disclosure the company has ever been required to publish, it is free on EDGAR, and it is written under liability for its accuracy.
  • Becoming public creates continuing disclosure obligations, so quarterly and annual financial statements follow on Forms 10-Q and 10-K.
  • Listing creates a trading market, which gives employees and early investors a way to sell and gives outside investors a way to buy.
  • The offering raises capital the company can use, which for a growing business can be the point of the exercise.

Cons

  • The SEC says directly that IPOs "can be risky and speculative investments," and a newly public company has no track record as a public reporter.
  • Individual investors usually cannot buy at the offering price, so the price they actually pay is set by early trading rather than by the negotiated offering.
  • Underwriters may support the price in the first days of trading, and the SEC notes the price may fall significantly once that support ends.
  • The limited float can push the early price up for reasons of supply, and the price may fall as restricted shares and locked-up shares become sellable.
  • There are no analyst estimates, no history of meeting or missing guidance, and no seasoned market opinion to test the price against.

People Also Asked

Answers to the most frequently asked questions.

Can an ordinary investor buy shares at the IPO price?
Usually not. The SEC states that underwriters and the issuing company control allocation, that the agency does not regulate that business decision, and that most underwriters target institutional or wealthy investors. Some online brokers offer IPO participation to their customers, but the SEC notes they often receive only a small allotment. The realistic path for most individuals is buying in the public market after trading begins, at whatever price the market is then setting.
Does the SEC approve an IPO before it happens?
No. SEC staff review the registration statement for compliance with disclosure requirements and often require revisions, and then declare it effective. The agency says explicitly that effectiveness "does not represent an approval of the merits of the IPO or an indication that the information disclosed is complete or accurate." Registration is about disclosure, not about whether the investment is sound.
Where does the money from an IPO actually go?
In a primary offering it goes to the company, which is what makes an IPO different from buying the same shares a week later. Some offerings also include selling shareholders, existing owners who sell part of their holding alongside the company, and the SEC notes that those proceeds go to the selling shareholders rather than to the business. The prospectus cover page discloses how many shares fall into each category.
What is a lock-up agreement and why does the expiry date matter?
A lock-up agreement prevents company insiders and large shareholders from selling their shares for a set period after the offering, most commonly 180 days according to the SEC, and its terms must be disclosed in the registration documents. It matters because the shares trading in the first months are only a fraction of the shares that exist. When a lock-up ends, a large number of shares can become available for sale at once, and the SEC notes the price may decline significantly in anticipation of that.
Is a big first-day jump a sign of a good investment?
It is a sign that the offering was priced below what early buyers would pay, which benefits whoever received an allocation. For someone buying after that jump it is the opposite of good news, because it raises the price they pay for the same company. The SEC warns that the offering price may bear little relationship to the trading price and that the early price can be supported by underwriter buying that later stops.

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