IPO prospectus: the free document that tells you who’s about to dump on you (if you bother to read it)
IPO hype always follows the same script. Headlines gush about the “deal of the year,” the underwriters do their best to sound optimistic without saying too much, social feeds fill up with rocket emojis, and you’re staring at a ticker you don’t really understand.
Meanwhile, the only thing that actually cuts through the noise is sitting in a dense, free prospectus that almost nobody opens.
And the most important section in that document is not the glossy growth story. It’s the answer to a much simpler question:
Who is selling, and why?
—
Primary vs secondary: two completely different deals
Most people assume an IPO means “the company is raising money to grow.” Sometimes that’s true. Often it’s not.
– Primary offering: The company issues new shares, raises fresh capital, and (in theory) uses that money to hire, build, or expand.
– Secondary offering: Existing shareholders – early investors, founders, executives – are the ones selling their stock to the public. The company itself may raise very little, or nothing at all.
On paper, both are “IPOs.” In reality, they are very different transactions:
– In a primary-heavy IPO, you’re funding future growth.
– In a secondary-heavy IPO, you’re largely providing an exit for insiders.
The headline never clarifies this. The prospectus does. It tells you exactly:
– How many shares are new (primary)
– How many are insider shares (secondary)
– Who the major sellers are and how much they’re unloading
If a large share of the offer is secondary, and especially if key insiders are selling big chunks, you’re not buying into the same story as “we’re raising to fuel expansion.” You’re entering at the point where other people are getting out.
—
Lockups: the quiet countdown to a share tsunami
Another rarely discussed time bomb is the lockup period.
Typically, insiders – founders, executives, employees, early investors – are restricted from selling their shares for about 180 days (six months) after the IPO. That date is written plainly in the prospectus.
When the lockup expires, two things can happen:
1. A massive wave of new shares hits the market.
Employees finally able to sell, funds rebalancing, early investors taking some money off the table.
2. Even the fear of that wave can pressure the stock.
Traders front-run the event, short sellers position ahead of it, and buyers hesitate.
If you don’t know the lockup expiry:
– You don’t know when the effective float (shares that can actually be traded) will suddenly expand.
– You don’t know when your carefully bought position could be competing with a flood of supply.
Prospectuses usually spell out:
– Exact lockup length
– Who is locked up
– Exceptions (e.g., some early holders allowed to sell earlier under specific conditions)
Not checking this is like driving a car without knowing where the cliff is.
—
The pre-IPO checklist: what to read *before* you care about price
After losing enough money on pretty stories and ugly filings, many disciplined investors end up doing the same thing: they build a checklist and refuse to touch an IPO until they’ve worked through it.
A robust IPO checklist usually covers at least:
1. Revenue quality and unit economics
– Is revenue actually growing at a healthy rate?
– What do margins look like: gross, operating, net?
– Does the company produce cash, or just burn it every year?
2. Customer behavior and retention
– Do customers stick around and spend more over time?
– Or is it a treadmill of constant acquisition and high churn?
3. Valuation vs reality
– Compare valuation to public peers, not to the narrative.
– Are you paying a premium for slower growth or worse margins than competitors?
4. IPO price vs last private round
– Is this a markup (investors already made big paper gains pre-IPO)?
– Or a down round, where the public is asked to pay less than late-stage private investors did?
5. Market size (real, not fantasy)
– Ignore the slide that claims “total addressable market = trillions.”
– Focus on the actual, reachable market for the product as it is today and in the next few years.
6. Moat – or lack of one
– What protects this business from competitors?
– Or is the honest answer: “nothing much”?
7. Customer concentration
– Does one client account for 20-40% of revenue?
– If that customer walks, does the whole thesis collapse?
8. Risk factors (the real ones)
– Every prospectus is full of boilerplate risk language. Ignore the generic.
– Rank the specific, business-killing risks: key dependencies, regulatory threats, technological obsolescence, platform reliance, etc.
9. Share structure and control
– Who has voting power after the IPO?
– Are you buying an A-class share with 1 vote while insiders keep super-voting shares with 10 or 20 votes each?
– Does management effectively control the company no matter what public shareholders think?
10. Lockup and who’s cashing out
– When can insiders sell?
– Which insiders are already selling in the IPO?
– How much of their stake are they unloading?
11. Accounting quality
– Any history of restatements?
– Are they using bizarre “adjusted” metrics that exclude recurring costs to manufacture “profitability”?
– Do the numbers line up, or do they feel engineered?
12. Management track record
– Have key executives been involved in past blowups, scandals, or serial underperformance?
– Has leadership successfully scaled and managed a public company before?
13. IPO market cycle
– Are we in a hot IPO window where anything with a story gets funded?
– Or in a cold environment where only genuinely strong businesses are coming to market?
14. Post-quiet-period research
– Once the quiet period ends, analysts finally publish formal coverage.
– Those reports often surface details and risks that marketing documents don’t emphasize.
15. Sentiment as noise, not signal
– What are people saying about the deal? Treat it as sentiment, not evidence.
– Hype is not data. Skepticism isn’t either. The filing is what counts.
—
Be your own short seller before you hit “buy”
One of the most valuable exercises before taking any IPO position is to write the bear case yourself.
Not a straw-man version. The most brutal, convincing argument you can construct for why the stock might:
– Fall 50% or more
– Never reach profitability
– Get disrupted or regulated away
– Dilute shareholders repeatedly to stay alive
If you can’t clearly explain:
– How this investment could go wrong
– What specific events would invalidate your thesis
– Which metrics you’ll watch for early warning signs
…then you don’t truly understand the deal yet. You just like the story.
Thinking like a short seller doesn’t mean you have to short the stock. It means you refuse to be the last optimist in a room full of better-informed sellers.
—
Never trust summaries – including your own
Another habit that quietly saves money: don’t trust shortcuts.
– Headlines round numbers.
– Marketing decks highlight only the prettiest metrics.
– Your own notes get distorted over time.
When something matters – number of shares offered, insider sales, lockup date, margin structure, customer concentration – go back to the actual prospectus and verify the figure on the page.
If you can’t point to where it is in the document, you don’t really know it. A “strong feeling” or remembered tweet is not a replacement for a real number in the filing.
—
How to quickly navigate a 300-page prospectus without going insane
A typical IPO filing is long, but you don’t need to read it front to back like a novel. You need to target the sections that answer the big questions:
1. Summary and offering details
– Basic business description, share count, primary vs secondary breakdown.
2. Use of proceeds
– What exactly will new capital fund? Debt repayment, acquisitions, general corporate purposes?
3. Principal and selling shareholders
– Who owns what before and after the offering?
– Which holders are selling now, and how much?
4. Capitalization and share structure
– Total shares outstanding post-IPO.
– Classes of stock and their voting rights.
5. Risk factors
– Look for specific operational and regulatory risks, not the generic “we might face competition.”
6. Management’s discussion and analysis (MD&A)
– Narrative explanation of revenue drivers, margin trends, and key business metrics.
– Clues about seasonality, cohort behavior, or dependency on specific partners.
7. Financial statements and notes
– Income statement, balance sheet, cash flow.
– Notes on revenue recognition, stock-based compensation, and any unusual accounting.
Once you build the habit, you can get a solid grasp on an IPO in an hour – and you’ll know ten times more than someone trading off a headline.
—
Reading insider behavior as a signal
Insider actions around the IPO can tell you a lot about how confident they truly are:
– Insiders not selling, long lockups:
Suggests management and early investors believe there’s more upside ahead, or at least want to show alignment.
– Heavy selling at IPO, short lockups, fast follow-on stock sales:
Can be a sign that early backers are eager to get out while the window is open.
None of this is absolute – some investors have fund life constraints, some need liquidity – but the pattern matters. When the people who know the business best are racing to convert equity to cash, you should at least ask why.
—
Why the IPO cycle itself matters
The broader IPO environment heavily shapes outcomes:
– In frothy markets, weak companies with great narratives can still get out the door at rich valuations. Many of those later disappoint as reality catches up.
– In tough markets, only stronger, more resilient businesses can clear the bar. Those offerings can be more reasonably priced – but sentiment can still be fragile.
Your checklist should include a reality check on where we are in the cycle and whether you’re paying bubble prices for a cyclical story.
—
Thinking like a professional, not a tourist
Institutional investors don’t buy IPOs because a headline said “explosive growth ahead.” They:
– Tear apart the prospectus
– Build their own models
– Stress-test scenarios
– Interview management
– Compare valuations across a wide set of peers
You’re not going to replicate all of that as an individual, but you can steal their mindset:
– Data over narrative
– Structure over vibes
– Downside first, upside second
And the prospectus – that boring, long, free document almost nobody touches – is the one place where the marketing gloss drops and the legal reality appears.
—
The quiet edge: do the work others skip
The main edge in IPOs isn’t secret information. It’s willingness to read what others ignore.
If you:
– Distinguish between primary and secondary offerings
– Track who’s selling and when they can sell more
– Understand the real economics, customer behavior, and risks
– Know exactly who holds control after the IPO
– Force yourself to write the bear case
…you’re already playing a very different game from the crowd chasing rocket emojis.
Most people treat a prospectus as an unreadable wall of text. The truth: it’s a detailed map showing you who’s about to dump on you, on what terms, and on what timeline.
You just have to open it.