Direct answer
What is a practical investment thesis template?
Use a template that forces the claim and its failure conditions to sit beside the supporting evidence. The minimum useful record has nine fields: question, claim, horizon, supporting evidence, weakening evidence, assumptions, catalysts, risks, and invalidation conditions.
Copy this structure
- Question: What exactly are you testing?
- Claim: What do you believe and why might consensus be wrong?
- Horizon: When should the evidence become observable?
- Supporting evidence: Which dated facts strengthen the claim?
- Weakening evidence: Which facts conflict with it?
- Assumptions: What must remain true?
- Catalysts: What could change market understanding?
- Risks: What can impair the expected outcome?
- Invalidation: What would make you abandon or rewrite the thesis?
Source every material statement
Use the filing section, table, transcript passage, or official series that supports a statement. A homepage link is rarely precise enough. Preserve the date and note whether the evidence is company-reported, independently measured, or inferred.
Add a review log
For each review, record what changed, what did not change, and whether the new evidence strengthens, weakens, or merely complicates the thesis. Do not silently overwrite the original reasoning.
Limits
- A template improves discipline but cannot guarantee complete coverage.
- Material information may be unavailable or reported with delay.
- The output remains research, not a personalized recommendation.
Common questions
Questions about this workflow
Can I use this investment thesis template in a spreadsheet?
Yes. A spreadsheet can hold the fields, but source links, revisions, and evidence-change history become harder to maintain as the number of companies and reviews grows.
What is an invalidation condition?
It is an observable condition that would make the core reasoning no longer credible, such as a broken unit-economics assumption, lost market access, or a persistent cash-flow deterioration.