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S-1 EXPLAINED · TEN QUESTIONS
S-1 Journal

To go public, a company has to put everything in writing.

Every company that lists in the US files an S-1 with the SEC — revenue, customers, risks, the share structure, the founder’s letter. Lie in it, and you are legally liable. No public document gets closer to what a company actually believes.

Google Inc. Form S-1
GOOGLE  ·  2004
Tesla Motors Inc. S-1
TESLA  ·  2010
WHAT IS S-1 JOURNAL

We read the whole thing,
so you don’t have to.

The S-1 is the registration statement a company files with the SEC before it goes public. Business model, KPIs, financials, the competitive landscape, the risk factors — it is the first time the company puts its own numbers on the record.

S-1 Journal reads those few hundred pages so you don’t have to. Not a recap of the news, butthe filing itself, quoted where it counts — turned into something you can actually make a call on.

The S-1 is formally the Registration Statement; the prospectus we read is its core.

SOURCE
THE FILING ITSELF
LENS
AN INVESTOR’S LENS
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
FORM
S-1
REGISTRATION STATEMENT
◀What we actually read
SpaceX Falcon Heavy launch (credit: SpaceX / Unsplash)
IN FOCUS
SPACEX

It’s called SpaceX —
and 93% of its market is AI

Read the filing, ten questions deep →
WHY IT’S WORTH READING

Why read the filing?

It can’t lie.
A false statement carries real liability — so the S-1 is far more candid than any deck or press release.
It admits its weak spots.
The risk-factors section is the company naming what it’s actually afraid of, in its own words.
Its ambition shows.
In the founder’s letter and the business section you can read the future it’s betting on.
The bet is visible.
The market-size and unit-economics assumptions show exactly what management is wagering.
ANATOMY OF AN S-1

What’s inside a filing

A few hundred pages — but the parts worth reading are always the same.

01
Prospectus SummaryBusiness Overview
The company in a few paragraphs, up front.
02
Risk FactorsRisk Factorsthe real talk
Where the company lists its own worst cases.
03
Use of ProceedsUse of Proceeds
Where the money it raises actually goes.
04
BusinessBusiness
The business model and the market, in detail.
05
MD&AMD&A
Management’s own read on the numbers.
06
ManagementManagement
Who runs it — and what they’re paid.
07
Principal StockholdersPrincipal Stockholders
Who actually holds control.
08
Founders' LetterFounder’s Letterthe set piece
Optional — and where the worldview shows.
THE FRAMEWORK

The news gives you the outcome.
The S-1 shows you the bet before it becomes one.

Every filing, through the same ten questions.
01What does it actually do?
02What does it compete on?
03How big is the market, really?
04Who’s using it?
05How does it make money?
06Do the numbers hold up?
07Who runs it?
08Who controls it?
09What is it afraid of?
10Where does the money go?

FULL ARCHIVE

The archive, by year

DateCompanyTitle
Oct 26, 2026AnthropicThis article only: free in full with email sign-upAI & SemiconductorsReading Anthropic’s S-1. First-Half Revenue Up 14x Year on Year, and 50.1% of the Vote in One Share.
Oct 5, 2026DayOne Data CentersEnergy & Data CentersOne Customer Is 69% of Revenue. Shareholders Will Elect 2 of 8 Directors.
Sep 23, 2026Wella FREEConsumer & BeautyWella, the Salon Hair Color Brand. $62.3M in Net Income. $2.7M for the Parent.
Sep 18, 2026NscaleAI & Semiconductors$103.4B in Multi-Year Contracts. $33M in Revenue in 2025.
Sep 3, 2026Oura FREEHealthcareProfitable. And $89.53 a Share in the Red.
Sep 1, 2026SB EnergyEnergy & Data CentersA $439 Billion Backlog. Zero Data Centers Running.
Aug 28, 2026Bamboo InsuranceInsurance & FinancialsHomeowners Insurance the Majors Fled. It Picks What Burns Less.
Aug 21, 2026CoVolt PowerEnergy & NuclearThe Backlog Grew 5.1×. Only 16% of It Is Binding.
Aug 18, 2026FreenomeHealthcareIt Can Find Colorectal Cancer in Blood. Someone Else Sells That Test Alone.
Jul 14, 2026Braveheart BioHealthcareIt Didn’t Invent the Drug. It Didn’t Run the Trials. It In-Licensed the Rest-of-World Rights.
Jul 20, 2026Reformation FREEConsumer & ApparelIt Paid Out $90 Million. Eight Days Later, It Filed an S-1.
Jul 10, 2026Holtec NuclearEnergy & NuclearNearly 40 Years in Nuclear. Next: Two Unproven Bets.
Jul 10, 2026ApnimedHealthcareThe primary endpoint was met —what the FDA questioned was its “meaning”
Jul 6, 2026SyntiantAI & SemiconductorsAn edge-AI company —and about 95% of its revenue is microphones
Jul 2, 2026Jersey Mike’s SubsConsumer & FranchiseThe Shop a 17-Year-Old Bought. Filed for IPO by PE in 18 Months.
May 20, 2026SpaceXSpace & CommunicationsIt’s called SpaceX — and 93% of its market is AI
May 8, 2026LimeMobilityLime, the e-scooter giant — Uber holds it by six strings
Apr 20, 2026X-EnergyEnergy & NuclearAmazon reserved a nuclear plant — none of them are running yet
Apr 17, 2026Cerebras SystemsAI & SemiconductorsTaking on NVIDIA with the world’s largest chip
Dec 17, 2025Andersen Group FREEThey Bought Back the Name of an Accounting Firm That Had Vanished
Jul 28, 2025FigmaFigma builds the screens behind Google Maps, Uber, and Netflix
Sep 14, 2023ArmIt Powers 99% of Phones, Yet Its Own Listing Pays It Nothing
Nov 16, 2020Airbnb FREEBookings down 72%, then a comeback with no ad spend
Aug 24, 2020Snowflake FREEBuilt by Oracle alumni, bought by Warren Buffett
Feb 1, 2012Facebook FREEOne in eight people on Earth — and zero mobile revenue
Jan 29, 2010Tesla FREEA car that didn’t exist yet, and a founder on a $1 salary
Apr 29, 2004Google FREETwo Stanford grad students who said this is not a conventional company

WHAT’S NEW

What’s New

New S-1 explainers and event-driven briefs — every update, in one place.

Oct 26Reading Anthropic’s S-1. First-Half Revenue Up 14x Year on Year, and 50.1% of the Vote in One Share.Anthropic · New S-1 explainer→Oct 22$103.4B in Multi-Year Contracts. $33M in Revenue in 2025.Nscale · New S-1 explainer→Oct 15Wella, the Salon Hair Color Brand. $62.3M in Net Income. $2.7M for the Parent.Wella · New S-1 explainer→Oct 10One Customer Is 69% of Revenue. Shareholders Will Elect 2 of 8 Directors.DayOne Data Centers · New S-1 explainer→Sep 14The blank “sellers” line is filled in. In the same filing, an affiliate of the sellers joins the underwritersBamboo Insurance Services · Amendment No.1 · S-1→Sep 11More customers, lower spend per customer. The first earnings report explains it in the same terms the prospectus had usedReformation · Q2 2026 earnings × S-1→Sep 10A $439 Billion Backlog. Zero Data Centers Running.SB Energy · New S-1 explainer→Sep 8Part of the IPO money would go to the founder’s side. That line is gone from the version that filled in the amountsHoltec Nuclear · Amendment No.2 · S-1→

SCOREBOARD

The answer key: if you’d bought $1,000 on IPO day

Every company we’ve decoded, tracked as a $1,000 buy on IPO day against the S&P 500. Winners and misses, recorded as they are.

See the scoreboard →
Whether it’s a great company or a mediocre one,
the call is yours — now that you’ve read the filing.
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Explanatory analysis for information only — not investment advice or solicitation; decisions are your own. Facts come from each company’s S-1 filing, without any guarantee of accuracy or completeness. Primary sources: SEC EDGAR.

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