What Is an IPO? How a Company Goes Public and How New Listings Trade
An IPO (initial public offering) is the first time a company sells its shares to the general public. The company registers the offering with the SEC, investment banks called underwriters manage and sell it, and the stock then lists on an exchange. Here is how the process works step by step, what the prospectus and lockup tell you, why the first trade rarely happens at the IPO price, and what a brand-new listing's chart can and can't show a trader.
What is an IPO? An IPO, or initial public offering, is the first time a company sells its shares to the general public. The company registers the offering with the SEC, investment banks called underwriters manage and sell the shares, and the stock then lists on an exchange such as the NYSE or Nasdaq, where anyone with a brokerage account can trade it.
I trade momentum, so new listings land on my scanners whether I want them or not. Most IPO explainers are written as "should you buy this, and which broker gets you in". This one is the mechanics: who does what, what the SEC does and doesn't do, why day one opens where it opens, what the lockup is, and what a chart with almost no history can tell you.
Quick Answer
A private company files a registration statement (usually Form S-1) with the SEC, investment banks underwrite and market the deal, the company sets an offer price from investor demand, and the shares are sold to the underwriters' clients. Then the stock lists on an exchange and trades in the open market at whatever buyers and sellers agree on. The SEC reviews the disclosure. It does not approve the deal or vouch for the company.
Every process fact on this page comes from the SEC's investor bulletin on investing in an IPO, related Investor.gov and FINRA pages, and Nasdaq's own rule filing, all read in October 2026. There are no company names, deal sizes or IPO return figures here. The numbers I found in other explainers mostly didn't trace back to anything primary.
One thing it isn't: a stock split, which only divides shares that already trade. An IPO creates a public market for a company that didn't have one. In market terms it's the primary market (the company selling new shares) handing off to the secondary market (everyone trading with each other), which the beginner guide to how the stock market works covers in more depth.
Why companies go public
The SEC's going public page puts it simply: a company sells shares to the public "usually to raise additional capital." Going public also gives founders, early investors and employees a market to sell into over time, and gives the company stock it can use for pay and deals. The cost is real: underwriting fees, legal and audit work, and public reporting forever after.
What Is an IPO and How Does It Work?
An IPO works in a fixed order. The company hires underwriters, files a registration statement with the SEC, answers SEC staff comments, markets the deal to investors, sets the offer price, and waits for the registration to be declared effective. Then shares are allocated and the stock opens on an exchange through an auction, not at the offer price.
- Pick underwriters.The SEC defines them as "the investment banks that manage and sell the IPO for the company". There's usually a lead bank plus a syndicate of other firms. They're paid a percentage of the offering.
- File a registration statement.A company can't legally offer shares unless the offering is registered or exempt. Most IPOs use Form S-1, and most of an S-1 is the prospectus.
- SEC staff review. Staff comment on the disclosure, and the company files amendments, labelled S-1/A.
- Market the deal.Management and the underwriters present the company to prospective investors (the roadshow) and gather indications of interest. The SEC calls the compiled list the "order book": how many shares each client-investor wants and at what price.
- Set the price.The underwriters use the order book to "recommend a price for the shares to the issuer, who ultimately determines the price of the IPO." Most explainers describe pricing as happening shortly before trading starts.
- Declared effective.Shares can't be sold until the SEC staff declare the registration statement effective. A final prospectus with the offer price is then filed.
- Allocate, list, trade.Shares go to the underwriters' clients, the stock lists, and the first trade happens on the exchange.
IPO timeline, from filing to first trade
The SEC does not approve IPOs
A lot of explainers say the SEC "approves" an IPO. It doesn't. The bulletin says the staff review "is not a guarantee that a company's disclosure is complete or accurate, and the staff does not evaluate the merits of any IPO." And being declared effective "does not represent an approval of the merits of the IPO." Effective means the paperwork cleared review. It says nothing about whether the stock is any good. From filing until that point the company is also in what people call the quiet period, which Investor.gov defines in its glossary, when its offering-related communications have to stay within the securities laws.
The full timeline, step by step
The steps above stop at the first trade. For a trader the story keeps going: price support in the first days, then the lockup expiry, then the same quarterly reporting every other public company does. The table runs the whole thing with who is responsible at each step.
| Step | What happens | Who |
|---|---|---|
| 1. Pick underwriters | A lead investment bank, usually with a syndicate of other firms, agrees to manage and sell the offering | Company, investment banks |
| 2. File the registration statement | Typically Form S-1. Most of it is the prospectus. It becomes public on the SEC's EDGAR database | Company and its lawyers |
| 3. SEC staff review | Staff comment on the disclosure and the company files amendments (S-1/A). This is a disclosure check, not a merits review | SEC staff, company |
| 4. Marketing (the roadshow) | Management and the underwriters present the company to prospective investors and collect indications of interest into an order book | Management, underwriters, institutional investors |
| 5. Pricing | Underwriters recommend an offer price from the order book. The company ultimately decides it | Underwriters, company |
| 6. Declared effective | Shares can now be sold. A final prospectus with the offer price is filed (usually a 424B3 or 424B4) | SEC staff, company |
| 7. Allocation | Shares go to the underwriters' clients, often mostly institutional and high net-worth accounts | Underwriters, syndicate brokers |
| 8. Opening cross | On Nasdaq the stock stays halted while orders build, then a single-price Halt Cross sets the first trade | Exchange, anyone with an order in |
| 9. Price support | Underwriters may buy shares in the first few days to keep the price from falling too far below the offer | Underwriters |
| 10. Lockup expiry | Locked-up insider shares become sellable. Investor.gov says most lockups run 180 days | Insiders, the market |
| 11. Ongoing reporting | Quarterly and annual reports on Forms 10-Q and 10-K, from now on | Company |
Rows 1 to 7 happen on paper. Row 8 is the first moment anything prints on a chart. I left out how long the whole thing takes because the explainers I read disagreed by more than a year.
What Is an IPO Prospectus?
An IPO prospectus is the offering document. The SEC describes it as "the offering document describing the company, the IPO terms and other information that an investor may use when deciding whether to invest." It makes up most of the S-1, it's free to read on the SEC's EDGAR database, and the SEC notes that the information you'd use to decide "often can only be found in the prospectus."
There are two versions. The preliminary prospectus (the "red herring") goes out while the deal is being marketed, before the price is set. After the registration statement is declared effective, the company files a final prospectus, usually listed on EDGAR as a 424B3 or 424B4, which adds the final offer price. The SEC points out that a new public company "typically has no prior reporting history", so the prospectus is often the only source you get.
The sections I'd skim first
- Prospectus Summary and Risk Factors.What the business is and everything the company's lawyers think could go wrong.
- Use of Proceeds. What the company says it will do with the money.
- Dilution.The gap between what new buyers pay and what existing holders paid on average. The SEC calls it "usually significant".
- Underwriting or Plan of Distribution. Who the underwriters are and how the shares are being sold.
- Principal and Selling Shareholders. Who owns what, and who is selling in the deal.
- Shares Eligible for Future Sale.How many shares can't trade yet and when they can. More on this in the lockup section.
- Description of Capital Stock.Share classes and voting rights. The SEC warns a dual-class structure can make it "more difficult, if not impossible" for public shareholders to influence the company.
IPO Price vs Opening Price on Day One
The IPO price is the negotiated number the underwriters' clients pay. The opening price is the first trade on the exchange, set by an auction of real buy and sell orders. They're different numbers, and the SEC says the offer price "may bear little relationship to the trading price." Trading does not open at the IPO price.
The SEC's explanation of why they differ is worth reading. The offer price "reflects a negotiated estimate as to the value of the company." Underpricing an IPO gives initial investors a discount and helps the underwriters sell every share. If the stock gets a big "bump" once trading starts, the underwriters' clients are happy, but the company may not be, since it could have raised more. The SEC frames it as the company and the investors wanting different things from the same number.
How the first trade is actually set
On day one the stock often starts trading later than the regular open. On Nasdaq, per its rule filing describing the IPO halt and Halt Cross, a new listing stays halted while traders enter orders. Before the halt lifts, Nasdaq shows indicative information about where the cross would clear "every second via the Order Imbalance Indicator". Then the Halt Cross executes the eligible orders at a single price. That price is the first print on your chart. Other exchanges run their own opening process, which I haven't covered here.
A made-up company prices its IPO at $20. The underwriters' clients pay $20. The opening cross might clear at $26 (+30% from the offer) if buy orders swamp sell orders, or at $17 (-15%) if they don't. Either way, someone who buys at the open pays the cross price, not $20. A market order doesn't cap what you pay.
That last line is why the difference between market and limit orders matters more on an IPO open than almost anywhere else. A limit order caps what you pay, at the cost of maybe not getting filled. There's also no earlier session to read: the stock has never traded, so the usual premarket range from extended hours doesn't exist yet.
Price support in the first few days
The SEC says underwriters "can support the trading price of the new issue in its first few days of trading," including by buying shares, often to keep it from falling too far below the offer price. Then the warning: "Once this support ends, the stock price may decline significantly below the offering price." You won't see that support labelled anywhere on a chart.
Why You Probably Can't Buy at the IPO Price
Most individuals buy a new stock after it opens, not at the offer price. The SEC bulletin says underwriters often distribute most IPO shares to institutional and high net-worth clients, and that the more common route for individuals is buying "when they are resold in the public market in the days following the IPO."
Investor.gov's page on why individuals have difficulty getting IPO shares gives the reasons. The underwriters and the company "have wide latitude in allocating IPO shares," and "the SEC does not regulate the business decision of how IPO shares are allocated." Only a limited number of broker-dealers are in the syndicate, and some have no individual clients. Most underwriters target institutional or wealthy investors. In a hot deal, demand far exceeds supply and the shares go to the most valued clients. Online brokers that offer IPOs often have only a small allotment.
Even if your broker does offer a deal, Investor.gov's note on IPO eligibility says no firm can guarantee you shares, a firm can't sell you IPO shares unless it has decided the investment is suitable for you, and firms may limit them to customers with certain balances or activity. Flipping (selling IPO shares immediately) isn't illegal, but your firm may refuse you future IPOs if you do it. And under FINRA Rule 5130, member firms can't sell a new issue to accounts where a "restricted person", broadly an industry insider, has a beneficial interest.
Does the chart have enough structure to trade?
Upload a chart screenshot. SnapPChart grades the momentum setup in the image, long or short, from the candles, EMAs, VWAP, MACD and volume. On a new listing with few candles, there may be no clear level to grade an entry against.
Grade this chartWhat Is an IPO Lockup Period?
An IPO lockup period is a stretch after the offering when company insiders agree not to sell their shares. Investor.gov says the terms vary, "but most prevent insiders from selling their shares for 180days." It's a contract between the insiders and the underwriter, not a holding period set by law, and the terms are in the prospectus.
Per Investor.gov's glossary entry on lockup agreements, lockups "prohibit company insiders" (employees, their friends and family, and large shareholders) "from selling their shares for a set period of time after an IPO." The insiders and the underwriter "typically enter into" the agreement before the IPO. Some lockups also limit how many shares can be sold over a period, so shares can come free in stages. A company using a lockup has to disclose the terms in its registration documents, including the prospectus. You'll see "90 to 180 days" in a lot of articles. That range isn't the SEC's wording, and the actual length is whatever the prospectus says.
Why traders care: Investor.gov says "a company's stock price may drop in anticipation that locked up shares will be sold into the market when the lockup ends." Note the word may. I'm not going to tell you what a lockup expiry does to a chart, because I don't know, and I haven't found a primary source that does.
Day-one supply is small
The bulletin says the shares traded on the first day "are generally only shares that were sold in the IPO." Locked-up and restricted insider shares can't trade yet, and flipping policies hold back some of the rest. The SEC says that "limited trading volume, particularly in the case of a highly sought-after IPO, can operate to drive the trading price of an issue steeply up." That's the float idea from the explainer on float vs shares outstanding, squeezed into a single day.
Market overhang, and where to find it
The shares that exist but can't trade yet are what the SEC calls the "market overhang." The price "may decline over time as shares that were previously restricted become available for sale," and when lockups expire it "may decline significantly if a large number of shares become available for sale all at once." The prospectus section called Shares Eligible for Future Sale shows how big the overhang is and when it unlocks. That's the closest thing to a sourced lockup calendar you'll get.
IPO vs Direct Listing vs SPAC
A traditional IPO is the underwriter-led route: banks market the deal, set a price with the company and sell shares to their clients before trading starts. A direct listing skips the underwriter-run offering and roadshow. A SPAC is a shell company that does its own IPO first, then merges with a private company later. All three end with a stock trading on an exchange.
- Direct listing.The company's shares list on an exchange without the traditional underwriter-led sale and roadshow, and existing holders can sell into the market. Exchange rules on whether the company itself can raise new money this way have changed over the years, so I'm not going to state a rule here.
- SPAC. FINRA's investor guide to SPACs defines one as "a shell company that is formed to raise capital through an IPO for the purpose of acquiring a private company or business to be identified after the IPO." FINRA flags less information up front, speculative investments, sponsor fees and incentives, conflicts of interest, and trading price risk.
Whatever the route, the SEC's summary of IPO risk applies: "By their nature, however, IPOs can be risky and speculative investments." Add two reasons from the same bulletin. There's no reporting history to check the prospectus against, and research from banks involved in the deal may carry a conflict of interest. After listing, the company has to file quarterly and annual reports (Forms 10-Q and 10-K) like any other public company, which is where that history starts.
What a New Listing's Chart Can and Can't Tell You
A new listing's chart has very little history, so most of what traders usually read on a chart isn't there yet. There are no long moving averages, no prior support or resistance beyond the offer price and the opening print, and no volume baseline. Day-one volume and bid-ask spreads can also be extreme. A thin chart gives you less information to base a trade on.
Go through the usual checklist from the basics of reading candles and trend and watch it come up empty. A daily chart has one candle. A 50- or 200-period simple moving average can't be drawn until that many bars exist. The only reference levels are the offer price and the first print, so the usual way of marking support and resistance has almost nothing to mark. Intraday, VWAP and short EMAs start from the first trade and fill in as the session goes, which is something, but the structure is a few hours old.
Volume is loud and hard to read. Relative volume compares today against an average, and a stock with no past sessions has no average, so RVOL is undefined on day one. Spreads can be wide while price discovery is still going on, and the guide to the bid-ask spread covers why that eats into every entry and exit. If you trade momentum, the same continuation rules from the momentum trading strategy playbook apply, they just have less to work with.
What a chart grade sees, and what it doesn't
SnapPChart reads the screenshot you upload and nothing else. It grades momentum continuation setups, long or short, from the candles, EMAs, VWAP, MACD and volume visible in the image. When a setup qualifies you get a grade and, on full analyses, an entry, a stop with its reasoning, and targets. It reads the established trend rather than the last few candles, so a chart with only a handful of bars gives it little structure and often no pullback level to grade. Expect a mediocre chart-quality score or a skip on those.
It doesn't know anything about the offering. Not the offer price (unless you've drawn it on the chart), the lockup date, the float, the overhang, the company or the news. All of that lives in the prospectus and the headlines, and reading it is your job. For a wider look at what AI can and can't read off a chart, there's an overview of AI chart analysis and a longer piece on where AI fits in trading.
Frequently Asked Questions
What is an IPO date?
People use it for two different days. One is the pricing date, when the company and underwriters set the offer price. The other is the first trading day, when the stock actually opens on the exchange. They can fall on different calendar days, so check which one a calendar or headline means. Expected dates you see before a deal are expectations, not commitments. A deal can be delayed, resized or pulled, and on the trading day itself the first print often comes later than the regular 9:30 a.m. ET open.
What is an IPO roadshow?
It's the marketing stretch after the registration statement is filed. The company's management and the underwriters present the business to prospective investors, mostly institutions, and collect indications of interest: how many shares each would want and at what price. Those go into the order book the underwriters use to recommend a price. Legally it sits in what securities lawyers call the waiting period, after filing and before the SEC staff declare the registration statement effective, when oral offers are allowed but sales are not.
What is the quiet period in an IPO?
Investor.gov says federal securities law doesn't actually define the term. It's used for the stretch around the registration filing when the company has to keep its offering-related communications within the rules. At a minimum it runs from the filing of the registration statement until the SEC staff declare it effective. Breaking those rules is called gun-jumping. You'll see day counts attached to the quiet period online. I couldn't trace any of them to a primary source, so I'm not quoting one.
Where does the money raised in an IPO go?
Not always all to the company. Some IPOs include selling shareholders, existing owners who sell part of their stake in the offering. The SEC's investor bulletin is direct about it: proceeds from selling shareholders do not go to the company, they go to those shareholders. The prospectus splits this out. The Use of Proceeds section says what the company plans to do with its share, and the Principal and Selling Shareholders section shows who is selling and how much.
Can SnapPChart grade an IPO chart?
It grades whatever chart screenshot you upload, including a newly listed stock. It reads the candles, EMAs, VWAP, MACD and volume in the image and grades a momentum continuation setup, long or short. On a chart with only a handful of candles there isn't much trend structure or pullback level to work with, so a mediocre chart-quality score or a skip is the likely result. It knows nothing about the offering, the offer price unless you've drawn it on the chart, the lockup date, the float or the company.
Everything here is general education. It isn't investment, financial or trading advice, it makes no prediction about any IPO or stock, and no company, broker, fund or security is being recommended. IPO process facts, pricing, allocation, price support, day-one supply, market overhang, prospectus sections and the 180-day lockup wording are from the SEC's Updated Investor Bulletin: Investing in an IPO (Oct. 14, 2022), the SEC's Going Public page and Investor.gov's glossary pages on IPOs, lockup agreements, allocation, eligibility and the quiet period. SPAC wording and the new-issue rule are from FINRA. The Nasdaq IPO halt and Halt Cross description is from Nasdaq's rule filing published in the Federal Register on February 20, 2025. All were read in October 2026, and rules can change, so check the current documents. The $20 offer and the $26 and $17 opening prices are hypothetical. Trading involves risk, including the loss of the money you put in. SnapPChart grades one static chart screenshot. It does not know offer terms, lockups, float, company information or news, and it does not place trades.
Writes about AI-assisted day trading, technical analysis, and the systems traders actually use to stay disciplined.
New listing, few candles. See what the chart actually supports.
Upload a chart screenshot. SnapPChart grades the momentum continuation setup on it, long or short, from the candles, EMAs, VWAP, MACD and volume in the image, and when it qualifies gives you, on full analyses, an entry, a stop with its reasoning, and targets. It doesn't know the offering, the lockup or the news. One skipped C-grade trade can pay for the subscription.