IPOs and Listings: How Companies Go Public

Every share you’ve traded in this course so far was second-hand. Exchanges, brokers, order books, index funds — all of it is the secondary market, where existing shares pass between investors like used cars between drivers. But used cars were new once. Someone built them, priced them, and rolled them off the lot. This lesson is about the lot: the primary market, where shares are born — how a private company becomes a public one, who gets rich on day one, who gets diluted, and why the confetti-and-bell-ringing ceremony is mostly a very expensive magic trick performed on the people watching from home.

Private vs public — who owns a company before the bell

Analogy. A private company is a dinner party: the founder picked the guest list, everyone at the table knows each other, and you can’t just walk in and buy a seat. A public company is a restaurant: anyone with money can sit down, the health inspector visits regularly, and the kitchen has to publish what’s in the food. An IPO is the day the dinner party puts up a sign and starts seating strangers.

Definition. A private company has shares, but they don’t trade on any exchange — they’re held by a small circle: founders, employees (usually via stock options or grants), and professional early investors like venture capitalists (VCs) and private equity funds. A public company has listed its shares on an exchange where anyone can buy them. An initial public offering (IPO) is the transaction that crosses the line: the company sells shares to public investors for the first time, and the shares begin trading on an exchange.

Why would a comfortable private company invite the public in? Three big reasons:

• Raise capital. Selling new shares brings in cash for growth — factories, hiring, paying down debt — without borrowing.
• Liquidity for early holders. Founders, employees, and VCs have spent years rich on paper. A listing gives them a market where that paper can finally become money.
• Acquisition currency. Public shares have a visible price, so a company can buy other companies with its own stock instead of cash. Hard to do when nobody agrees what a private share is worth.

And why do some companies stay private for a decade longer than they used to (SpaceX, Stripe)? Because going public has a price tag beyond the banker fees:

• Regulatory burden. Quarterly reports, audited accounts, disclosure of executive pay, an army of lawyers — forever.
• Public scrutiny. Every stumble becomes a headline and a share-price chart. Some founders prefer to fail in private.
• Cheap private money exists now. Giant late-stage funds will happily write nine-figure checks to private companies, so the “we need capital” pressure arrives later than it did in 1999.

Worked example — a pre-IPO ownership table

Meet Croissant Robotics, a fictional company with 90 million shares outstanding, all private:

Nobody here can easily sell. The employee with 50,000 shares “worth” $1M owns a number in a spreadsheet, not money. Keep this table — we’ll watch it change when the IPO happens.

Misconception. “Private companies don’t have shares.” They absolutely do — often millions of them, with a legal ownership registry, option pools, and internal valuations. What they lack is a public market for those shares. Privacy is about where (and whether) the shares trade, not whether they exist.

When it matters. Whenever you read “Company X valued at $50B in its latest funding round,” remember: that’s a price negotiated by a handful of private buyers for a sliver of shares, not a market-tested price. Private valuations can be — and regularly are — wildly different from what the public market later agrees to pay.

The IPO process, step by step

Analogy. An IPO is less “put the house on the market” and more “royal wedding with bankers.” There’s a planning committee, an engagement announcement, a months-long tour to charm the guests, a guest list with strict allocations, and one chaotic public ceremony at the end. Here’s the procession.

Step 1 — Hire the underwriters

The company picks underwriters: investment banks (Goldman Sachs, Morgan Stanley, and friends) who run the deal. They advise on valuation, drum up buyers, handle the paperwork, and — in a traditional “firm commitment” deal — actually buy the shares from the company and resell them to investors, taking the placement risk. For this they charge a fee, historically around 7% of the money raised for typical US deals. Raise $200M, and roughly $14M goes to the banks. Weddings aren’t cheap.

Step 2 — File the prospectus (the S-1)

In the US the company files an S-1 registration statement with the SEC — the prospectus. It’s a brutally detailed confession: audited financials, business model, competition, executive pay, and a long “Risk Factors” chapter where lawyers list every way the company could die. It’s public. Anyone — including you — can read an S-1 for free before an IPO. Almost nobody does, which tells you something about the average IPO buyer.

Step 3 — The roadshow

Management and the bankers tour the world’s big institutional investors — pension funds, mutual funds, hedge funds — pitching the company in hotel ballrooms and video calls for about two weeks. The audience isn’t retail; it’s the institutions who’ll be offered shares at the IPO price.

Step 4 — Book-building

As the roadshow runs, the banks collect indications of interest: each institution says how many shares it would take and at what price. This is book-building — assembling a demand curve, one fund at a time. If the book is “many times oversubscribed” (demand far exceeds the shares on offer), the price range gets revised up.

Step 5 — Pricing, the night before

The evening before trading begins, the company and underwriters set the final offer price — say $20 — based on the book. This is the price at which the company actually sells its shares. Everything that happens on the screen tomorrow is secondary-market noise; the company’s money is fixed tonight.

Step 6 — Allocation

The underwriters decide who gets shares at the offer price. Hot deals are rationed: a fund that asked for a million shares might get 100,000. Allocations skew heavily toward large institutions and the banks’ best clients. Retail investors typically get little or nothing at the offer price. Remember this — it explains the pop.

Step 7 — The first trade

Next morning, the stock opens on the exchange. The exchange runs an opening auction to match the flood of orders, and the first public print appears — often well above the offer price. The bell rings, the confetti falls, and from this second onward it’s just a normal stock in the secondary market you already know.

Primary vs secondary shares — and the dilution math

Analogy. Picture a pizza cut into 90 slices, owned by the dinner-party guests. There are two ways to feed newcomers. You can bake extra slices — the pizza grows, the kitchen gets paid, but everyone’s old slices are now a smaller fraction of the whole. Or existing guests can hand over their own slices for cash — the pizza stays the same size, the kitchen gets nothing, and the sellers walk away with money. IPOs usually do both.

Definition. Primary shares are newly created shares sold by the company — the cash goes into the company’s bank account, and the share count rises. Secondary shares are existing shares sold by current holders (founders, VCs, employees) — the cash goes to those sellers, not the company, and the share count doesn’t change. The mix is disclosed in the prospectus. Dilution is what primary shares do to existing owners: more total slices means each old slice is a smaller percentage of the company.

Worked example — Croissant Robotics dilutes its founders

Croissant Robotics has 90M shares. In the IPO it issues 10M brand-new primary shares at the $20 offer price.

• Cash raised by the company: 10M × $20 = $200M (minus that ~7% underwriting fee — about $14M — so roughly $186M lands in the account).
• New total share count: 90M + 10M = 100M shares.
• The founders’ stake: they still own the same 45M shares, but 45M ÷ 100M = 45%. Before the IPO it was 45M ÷ 90M = 50%.

The founders sold nothing and still gave up five percentage points of ownership. That’s dilution: nobody took their shares; the pie just grew around them. In exchange, the company they own 45% of now has $186M of fresh cash inside it — so a smaller slice of a (hopefully) more valuable pizza.

Misconception. “Dilution means the founders lost money.” Not necessarily. Their percentage fell, but the company gained $186M of assets. If the cash is invested well, 45% of the bigger company can be worth more than 50% of the smaller one was. Dilution is a trade, not a theft — though it is a theft if the company raises cash and burns it.

When it matters. Read the prospectus line that splits primary from secondary shares. A deal that’s mostly primary says “we need fuel to grow.” A deal that’s heavily secondary says “the insiders would like their money now, thanks” — which isn’t automatically damning, but you should at least notice who’s heading for the exit while inviting you in.

The IPO pop — money left on the table

Analogy. Imagine selling your house through an agent who prices it at $400k, sells it that evening to his favorite clients, and the next morning it’s revalued at $600k. The agent’s clients are thrilled. The agent is thrilled — his clients owe him a favor. You got $400k for a $600k house and a newspaper story calling the sale “a huge success.” That, structurally, is an IPO pop.

Definition. The pop is the jump from the offer price to the first-day trading price. Underpricing — setting the offer price below what the market will pay — is not an occasional accident; it’s the historical norm. Across decades of US IPOs the average first-day return has run roughly 10–20%, with hot periods far wilder. The money implied by that gap is called money left on the table: cash the company could have raised but handed to the allocated investors instead.

Why does everyone tolerate it?

• Underwriters like it. A guaranteed pop makes allocations a gift they can hand to their best clients, who repay the banks with future business. The bank’s fee is a percentage of the raise, but its relationships are priced in pops.
• It buys hype. “Stock soars 30% on debut” reads better than “stock priced with surgical accuracy.” Companies accept some underpricing as a marketing expense and insurance against the humiliation of a first-day drop.
• Genuine uncertainty. Nobody truly knows the right price for a company that’s never traded. Pricing low reduces the risk of a failed, undersubscribed deal.

Worked example — Croissant Robotics leaves $100M on the table

Croissant priced its 10M primary shares at $20 and the stock closes day one at $30.

• The market just declared the shares were worth $30 each.
• The company sold them for $20 each — $10 per share below market-clearing value.
• Money left on the table: $10 × 10M shares = $100M.

The company raised $200M when the market was apparently willing to hand it $300M for the same shares. That missing $100M didn’t vanish — it became the day-one gain of the institutions allocated at $20. Meanwhile the headlines said the IPO “popped 50%” and everyone called it a triumph. For whom, exactly?

And the retail investor at the opening bell? You couldn’t get an allocation at $20 — those went to the institutions in Step 6. Your market order filled at the open, around $30. The famous average IPO pop is measured from the offer price to the close — a return earned by people who bought before public trading began. Buying at the open means buying after the pop. You’re not early; you’re the person the early people are selling to.

Misconception. “A big pop means the IPO went great.” For the allocated funds, yes. For the company, a big pop is literally the measure of how badly it mispriced its own sale. The perfect IPO, from the company’s standpoint, pops approximately 0%.

When it matters. Any time you feel the gravitational pull of a hyped debut. The trade everyone envies — buying at the offer price — was never on the menu for you. The trade actually available — buying at the open — has a very different, and much worse, historical record.

Lock-ups — the insider countdown

Analogy. After the wedding, the in-laws agree not to list their spare rooms on Airbnb for six months — it would rather spoil the impression that everyone’s staying. A lock-up is the same promise in securities form: the insiders agree not to flood the market with their shares while the marriage is young.

Definition. A lock-up agreement bars insiders — founders, employees, VCs — from selling their shares for a set period after the IPO, typically 90 to 180 days. It’s a contract with the underwriters, not a law, and it exists so the fragile new stock isn’t immediately buried under an avalanche of insider selling. Here’s the catch: when the lock-up expires, all of that pent-up supply becomes sellable on the same day. Insiders often hold far more shares than were sold in the IPO itself — Croissant Robotics floated 10M shares, while 90M sit locked behind the gate.

Think back to your supply-and-demand machinery: a lock-up expiry is a sudden rightward lurch in potential supply with no reason for demand to move. Studies find share prices drop a few percent on average around expiry — and the date is printed in the prospectus, so the market often starts flinching before the day itself.

Misconception. “Insiders selling at expiry means they think the company is doomed.” Mostly it means they’ve been illiquid for ten years and would like a house. Routine diversification, not prophecy. The signal worth watching is unusual behavior — executives dumping everything at the first legal second is a different look than a scheduled, modest trim.

When it matters. If you’re considering a recently listed stock, check the calendar before you check the chart.

Before you reveal the answer, try it yourself: Croissant Robotics IPO’d on March 1 by selling 10M shares, with 90M insider shares locked for 180 days. What’s the structural risk around late August, and why might the price wobble even earlier?

The alternatives — direct listings and SPACs

A traditional IPO is not the only door into the public market. Two rivals got famous in the last decade — one elegant, one infamous.

Direct listing. The company simply lists its existing shares on an exchange — no new shares, no underwriter-set price, no allocations. The opening auction discovers the price from real supply and demand on day one. Spotify (2018) made it famous. The trade-off: the company raises no new capital (it’s purely an exit door for existing holders), and there’s no underwriter stabilizing the debut. Best suited to famous, cash-rich companies that need liquidity, not money.

SPAC (Special Purpose Acquisition Company). A blank-check shell raises cash in its own IPO (traditionally at $10 a share) with no business at all, then hunts for a private company to merge with. The merger makes the target public without a traditional IPO — faster, with looser rules around rosy financial projections. In the 2020–21 mania, hundreds of SPACs took flying-taxi startups and pre-revenue dreams public. The hangover was brutal: post-merger SPAC companies massively underperformed the market on average in the following years, many losing most of their value, with sponsors’ fee structures (the “promote” — typically a free ~20% stake) and heavy dilution doing much of the damage. Some good companies came through SPACs; the average outcome was an expensive lesson.

Life after the listing

Ringing the bell isn’t the finish line; it’s the start of being graded forever.

• The quiet period. Around the IPO, securities rules restrict what the company and its underwriters can publicly say beyond the prospectus — no hyping the stock outside the official document. Shortly after listing (around 25 days for the underwriters’ analysts), the muzzle comes off.
• Analyst coverage. Banks’ research analysts begin publishing ratings and earnings forecasts — conveniently, often starting with the very banks that ran the deal, whose first ratings are rarely scathing. Coverage brings attention, scrutiny, and the quarterly ritual of beating or missing estimates.
• Index eligibility. Remember the indices lesson: getting listed does not put you in the S&P 500. The index has gates — among them sufficient market cap, enough shares in public hands (float), trading liquidity, time as a public company, and positive earnings (including the most recent quarter and the most recent four quarters summed). A money-losing, freshly listed darling can wait years. When a stock finally is added, index funds — the dumb-but-massive buyers you met earlier — must mechanically buy it, which is why index inclusion is an event traders watch.

Should you buy IPOs? The honest evidence

Time to be the lawyer reading the Risk Factors chapter. The academic record on IPO investing — most famously the decades-long datasets of Jay Ritter, the “Mr. IPO” of finance research — says two things at once:

1. First-day returns are great… for the allocated. That average 10–20% pop is real, but it’s measured from the offer price. Unless you were handed shares at the offer price (you weren’t), it was never your return.
2. Long-run returns are poor on average. Measured over the three-to-five years after listing — the period when you actually could buy — IPOs have, on average, underperformed comparable established stocks. Buying recent IPOs systematically has historically meant paying peak-hype prices for young, unprofitable companies right before lock-up supply and reality arrive.

And the third, sneakier finding: the average hides a brutal skew. A tiny handful of mega-winners (the Amazons) post returns so colossal they prop up the whole category’s reputation, while the typical IPO loses to the market and a large fraction lose money outright. Survivorship in your memory does the rest — you remember the one that 50x’d, not the forty that faded. Buying IPOs hoping to catch the next Amazon is buying lottery tickets and calling it stock-picking.

None of this says never. It says: the structural deck — allocation you can’t access, a pop you buy after, lock-up supply ahead, hype-peak pricing — is stacked, and the burden of proof is on the specific company, via that S-1 you now know how to find, not on the confetti.

Putting it together

A company starts as a dinner party — founders, employees, VCs holding shares nobody can easily sell. The IPO turns it into a restaurant: underwriters are hired, the S-1 confesses everything, the roadshow charms institutions, book-building maps demand, and the offer price is set the night before — which is when the company’s money is fixed, fee’d at ~7%. New primary shares raise cash and dilute (90M shares + 10M new at $20 → $200M raised, founders 50% → 45%); secondary shares just cash out insiders. The first-day pop rewards the allocated institutions and measures the money left on the table ($20 priced, $30 close → $100M); retail at the open buys after the jump. Lock-ups hold insider supply back for 90–180 days, then release the wave. Direct listings skip the bankers’ pricing but raise nothing; SPACs offered speed and delivered, on average, a hangover. After listing come quiet periods, analyst grades, and the long wait for index eligibility. And the evidence says the average IPO, bought when you could actually buy it, has been a below-market bet dressed in confetti.

One last mixed recap before the exam:

Key Takeaways