Guide · Investment thesis framework
How to write an investment thesis
An investment thesis turns a pile of raw material — 10-Ks, transcripts, news, your own notes — into a structured argument for owning a security. This guide walks through the framework Moatery uses, then shows a worked example by running the same facts through a legendary investor's lens.
What an investment thesis actually is
A thesis is not a price target and it is not a list of bullet points from a sell-side deck. A thesis is a falsifiable argument: I believe this business will be worth materially more than today's price because of X, Y, Z — and here is what would prove me wrong.
The point of writing it down is not the document. The point is forcing yourself to commit, in plain language, to a small number of claims you can check against reality later. A thesis you cannot disprove is not a thesis — it is a story.
The seven-part investment thesis framework
Most useful theses, regardless of style, answer the same seven questions. Keep each section short — one paragraph, not three pages.
- 1
The business in one paragraph
What does this company actually sell, to whom, and how does it make money? If you cannot do this without jargon, you do not understand it yet.
- 2
The moat
Why can this company earn above-average returns for years without being competed away? Brand, switching costs, network effects, scale, regulation, or something rarer. Name it.
- 3
The numbers that matter
Pick three to five operating metrics that genuinely drive the business — not every line in the 10-K. For a consumer brand, gross margin and unit growth. For a SaaS company, net retention and gross margin. Write down today's level and the trajectory.
- 4
Management and capital allocation
What has management actually done with cash over the last five years — buybacks, dividends, acquisitions, debt paydown, organic reinvestment? Does the track record match the words on the earnings call?
- 5
The price
Why is the price wrong today? Be specific. "Multiple compression on transitory tariff pressure," "post-IPO lockup overhang," "category misclassified as cyclical." If you cannot name the mispricing, you are not buying a bargain — you are buying a quality compounder at full price, which is a different thesis.
- 6
What would prove you wrong
Two or three concrete, observable things that — if they happened — would kill the thesis. Gross margin falls below X. Net retention drops below Y. The founder sells more than Z% of their stake. Write them down before you buy.
- 7
Holding period and exit
Are you buying a 20-year compounder or a 24-month re-rating? The answer changes which signals matter. Most thesis failures trace back to mixing up the two.
Use a legendary lens to pressure-test it
The seven sections above are necessary but not sufficient. The hardest part of writing a thesis is noticing what you missed — the question a disciplined investor would have asked and you did not.
This is where reading the same material through a published investor's philosophy helps. Buffett asks different questions than Lynch. Munger cares about different things than Marks. Li Lu's holding-period assumptions are different from Graham's margin-of-safety arithmetic. None of them is right in the abstract — but each one will flag a weakness in your draft the others would not catch.
Moatery is built around this idea. You paste in the raw material — filings, transcripts, your own notes — and the tool drafts a memo through one of six legendary lenses: Buffett, Munger, Graham, Lynch, Marks, or Li Lu. Then it runs the same facts through a second lens and surfaces where they disagree. That disagreement is usually where the real risk lives.
Investment thesis example: Crocs through Li Lu's lens
Here is the seven-part framework applied to Crocs (CROX), drafted through Li Lu's lens. This is a condensed version — the full worked example with a Q1 2026 impact check is here.
Business
Crocs sells one product — a foam clog — to a global audience, at a price point most consumers buy without thinking, through a mix of wholesale and a growing direct-to-consumer channel. HEYDUDE is a second brand.
Moat
Brand and global distribution on a single, comfortable, instantly recognizable product. Gross margins near 60% through tariff pressure are the proof.
Numbers that matter
International unit growth above 7%, gross margin near 60%, share count down from ~56.5M to ~50.7M, debt continuing to fall.
Management
Aggressive buybacks at single-digit P/Es while paying down debt — capital allocation aligned with the price the market is offering.
Price
A single-digit P/E on the core brand alone, with HEYDUDE effectively valued at zero. The market is pricing a one-product franchise as if the product were going away.
What would prove me wrong
Gross margin breaks below 55%; international unit growth turns negative two quarters in a row; management does another debt-funded acquisition.
Holding period
Five years, sized to the question "is this still a durable consumer staple?" rather than "is the next quarter good?"
That memo, drafted through Li Lu's lens, lands on a cautious-but-engaged verdict. Run the same facts through Buffett's lens and the verdict upgrades — because Buffett's framework prices current cash economics at the offered price more heavily than Li Lu's 20-year durability lens does. The disagreement between the two lenses is the thesis's most useful artifact: it forces you to decide which question you are actually answering before you buy.
Five mistakes that quietly kill a thesis
- Writing it after you bought. The thesis exists to discipline the decision. After the trade it just rationalizes it.
- Confusing a good business with a good price. A wonderful company at any price is a great way to underperform for a decade.
- No falsifiers. If nothing could prove you wrong, you are not analyzing — you are believing.
- Too many metrics. Three to five operating numbers you actually check each quarter beats a 40-tab model you never reopen.
- One lens only. Reading the same material through a second philosophy is the cheapest source of second opinions in investing.
How to revisit a thesis each quarter
A thesis is a living document. Each quarter, walk through the seven sections and mark each one Confirmed, Weakened, or Broken against the new filings and transcript. A thesis with two or more Weakened sections — or a single Brokenfalsifier — is a position to trim or exit, regardless of price action.
This is what Moatery is built to make automatic. The original memo, the quarterly impact check, and the side-by-side second-lens read all live in one place, so the decision to keep holding is grounded in the same framework as the decision to buy.