How IPOs Work: From Private Company to Public Ticker

People treat an IPO as the moment a company meets the market. It is the moment the company stops meeting the market, because the price was agreed in a conference room days earlier by a bank, a management team and a list of institutions you are not on. By the time the ticker appears in your app, the pricing decision is history and you are trading against the people who made it.

This guide follows one offering from the filing to the lockup expiry six months later, with the same deal and the same numbers carried the whole way.

What the company is buying

The obvious purchase is capital. New shares raise money that never has to be repaid. It funds expansion, research or paying down debt.

The less obvious purchases usually weigh more. Early investors and employees are holding paper they cannot sell, a listing creates the market that frees them, public shares become currency for acquisitions, and a visible price gives the business a number to hire against, borrow against and be bought at.

The bill is permanent. Quarterly filings, disclosed executive pay, an analyst base to answer to, and audit and legal costs a private company never sees.

The S-1, and the one section worth reading

The process starts with a registration statement filed with the Securities and Exchange Commission, the Form S-1, which carries audited financials, risk factors, the ownership table, the use of proceeds, and the business described in the company’s own words.

Read the risk factors first. Everything else in the document is written to sell you something. The risk factors are the one place a company is legally motivated to write down what could go wrong, at length, in sentences its lawyers approved for exactly that purpose.

While that is in review, the company hires underwriters. A lead bank runs the deal. A syndicate joins to distribute the shares. Under a firm commitment underwriting the banks buy the entire offering from the company at a discount and resell it, so they carry the risk of not placing the stock.

The fee, in dollars

That discount is the gross spread. On mid-size U.S. IPOs it runs conventionally around 7 percent of gross proceeds.

Our company sells 10 million new shares at 18 dollars. Gross proceeds 10,000,000 x $18 = $180,000,000. Gross spread at 7 percent, $180,000,000 x 0.07 = $12,600,000, split across the syndicate. The company receives $180,000,000 - $12,600,000 = $167,400,000, or $167,400,000 / 10,000,000 = $16.74 net per share, before legal, accounting and listing costs that run to several million more.

Most deals also carry a greenshoe option, letting underwriters sell up to 15 percent more shares than planned, and here that is 10,000,000 x 0.15 = 1,500,000 extra shares, used to stabilise the price in the first days of trading.

Book building, and the room you are not in

With the S-1 filed, management tours institutional investors while the banks collect indications of interest: how many shares each account wants and at what price. That accumulating demand schedule is the book.

The range published in the filing, say 15 to 17 dollars, moves as the book fills. Heavy demand lifts it. A deal that struggles gets repriced down or pulled entirely. Our 18 dollar price came from a book that filled above the range.

Allocation is discretionary. This is the part retail folklore misses. The lead bank decides who gets shares. The largest allocations go to institutions that show up for many deals and hold what they are given, and a handful of brokers run small retail allocation programs that are a rounding error against the whole.

The first-day pop, and who paid for it

The deal prices at 18, opens at 26 and closes the first day at 24.

Headlines call that a successful IPO. Look at who ended up with the money. The institutions allocated at 18 hold $24 - $18 = $6 a share, a 33 percent gain in a session. The company sold 10 million shares at 18 when buyers were evidently willing to pay 24, leaving 10,000,000 x $6 = $60,000,000 on the table, nearly five times the 12.6 million dollar fee it paid the banks to get the price right.

Participant	Price paid	Position after day one at 24
Company (seller)	Received 16.74 net per share	Capital raised, dilution done
Allocated institution	18.00	Up 6.00 per share
Retail buyer at the open	26.00	Down 2.00 per share
Retail buyer at the close	24.00	Flat, awaiting lockup expiry

The lockup, and the two structures that skip all of this

Insiders, employees and pre-IPO investors sign lockup agreements, typically 180 days, during which they cannot sell, so the float, the shares actually available to trade, is small in the early months, which is why new listings move violently in both directions and why the spread on them is wider than the size of the company suggests. Market makers and liquidity explains the mechanism behind that.

When the lockup expires, the supply picture changes at once. If the IPO floated 10 million shares out of 120 million outstanding, the expiry makes up to 110 million eligible to sell, and even a modest fraction reaching the market is more stock than the float absorbed all year. Markets anticipate the date, so the pressure often arrives in the weeks beforehand. The date is printed in the prospectus. That makes it one of the very few genuinely knowable events in a new listing.

A direct listing skips the underwritten offering entirely. Existing shares are listed. Holders sell into the open market from day one. No syndicate sets a price, no gross spread is paid, there is no traditional lockup, and price discovery happens in a large opening auction, which works the way the opening auction does on any other day, with far more size.

A special purpose acquisition company raises money into a shell that then merges with a private business, taking it public without the S-1 offering process. Read the incentives before the story: sponsors typically receive a large founder stake at a nominal price, and shareholders who redeem before the merger take their cash back while those who stay absorb the dilution.

The advice writes itself. Almost nobody follows it. Wait for two or three reported quarters on any new listing. You get audited results as a public company, an analyst base, the lockup behind you and a float wide enough that the spread is tolerable. The cost of that patience is missing the occasional run, and it removes the most common way of losing money on a new ticker.

Read what is Wall Street for where underwriting sits in the wider primary market, and how the stock market works for what happens once the ticker is live. New listings join indices on their own schedule, covered in stock market indices explained. When the first results land, how to read an earnings report tells you where to look, and the stock screener lets you put the new listing’s valuation next to its established peers.