Step 1
One-sentence thesis + time horizon
Write the core claim in plain language: what must be true, over what time horizon, and why the market is likely mispricing it. If you cannot define th...
Keyword: investment thesis template
Investment Thesis Template: From Narrative to Testable Decision
A structured investment thesis template that turns a stock idea into testable assumptions, disconfirming evidence, downside controls, and review triggers.
An investment thesis is a testable claim about why a stock should deliver returns and what would prove you wrong. This template helps you convert a narrative idea into explicit assumptions, disconfirming evidence, downside mapping, and a review cadence so you can size positions, hold, or exit with rules instead of emotions. Use it before buying, after major earnings surprises, or whenever conviction changes. It is not a price prediction tool; it is a discipline tool that makes decisions auditable.
30-second action
Turn this page into one decision step
Pick the smallest next action now: test your bias pattern, run a scenario, or copy a prompt before making a portfolio move.
Quick Take
- One-sentence thesis + time horizon
- Assumptions and evidence checklist
- Counter-thesis + downside map
Visual Playbook
Step 2
Assumptions and evidence checklist
List the few assumptions that drive the outcome and how you will check them. Checklist: return driver, leading indicators, disconfirming signals, requ...
Step 3
Counter-thesis + downside map
Write the strongest bear case before entry. Then map the downside path: what breaks first, which risks are reversible, and what protective actions you...
Framework
1) One-sentence thesis + time horizon
Write the core claim in plain language: what must be true, over what time horizon, and why the market is likely mispricing it. If you cannot define the claim, you cannot validate the position.
2) Assumptions and evidence checklist
List the few assumptions that drive the outcome and how you will check them. Checklist: return driver, leading indicators, disconfirming signals, required margins of safety, and what data would change your mind.
3) Counter-thesis + downside map
Write the strongest bear case before entry. Then map the downside path: what breaks first, which risks are reversible, and what protective actions you would take if the base case weakens.
4) Valuation band + sizing rules
Translate conviction into decision rules: entry range, add/reduce conditions, initial size cap, and the maximum loss you are willing to tolerate. If you cannot state sizing rules, the thesis is not actionable.
5) Review cadence + invalidation triggers
Define when to re-underwrite (e.g., quarterly) and what evidence invalidates the thesis. This prevents narrative drift during volatility and reduces the urge to “average down” without new information.
Template Snapshot
Decision fields to lock before execution
- Thesis in one sentence
- Invalidation trigger and evidence threshold
- Risk budget and position-size boundary
- Review date and expected catalyst window
Action Checklist (Shareable)
- Write your decision objective in one sentence before reading price action.
- Run at least one relevant case in KeepRule Scenarios (/scenarios).
- Tie the action to one principle and one invalidation trigger (/prompts).
- Set position size from downside tolerance first, then expected upside.
- Schedule a 7-day post-mortem using the same checklist before any new change.
Share Kit
Why KeepRule
- Structured decision system across Scenarios, Principles, Masters, and Prompts.
- Built for repeatable execution, not one-off opinions.
- Designed for long-term investors who want fewer emotional mistakes.
Recommended KeepRule Paths
FAQ
How long should a thesis document be?
One focused page is enough for most positions if assumptions, evidence checks, valuation logic, sizing rules, and invalidation triggers are explicit. Longer documents often hide missing decision rules.
What is the difference between a thesis and a story?
A story sounds plausible. A thesis is testable: it states specific assumptions, what evidence would support or contradict them, and what actions you will take when the evidence changes.
What counts as an invalidation trigger?
A trigger is a predefined condition that makes you re-underwrite or exit, such as a broken return driver, a change in industry structure, repeated misses on the key metric you chose, or leverage/liquidity risk that violates your risk budget.
Should I rewrite the thesis after every earnings report?
Update only when key assumptions materially change. Instead of rewriting, add a short “evidence log” entry: what changed, whether it strengthens or weakens the thesis, and whether any triggers are closer.
Can this template be used for ETFs?
Yes. Replace company-level assumptions with exposure, factor, and macro assumptions (fees, tracking difference, concentration, and regime risk). The same rule applies: define what must be true and how you will measure it.
Write one thesis before your next position
Pick one watchlist name and complete thesis, assumptions, sizing rules, and invalidation triggers before placing any order.