#1
Three Reasons to Sell
"There are only three valid reasons to sell: you made a mistake in your analysis, the company no longer meets your criteria, or you found a much better opportunity."
Sell only for three specific reasons.
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Philip Fisher📌 Selling & Review
Philip Fisher's Selling & Review Rules
These are 4 Selling & Review principles distilled from Philip Fisher's writing and public remarks. Use them as a decision checkpoint: translate each rule into a yes/no test, write what evidence would change your mind, and set a review date before you act. When a rule feels vague, open the full principle page and capture the driver you can verify (cash flows, leverage, incentives, competitive edge). This is educational, not investment advice—double-check primary sources and fit every rule to your time horizon, risk budget, and constraints.
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- Clarify your decision: time horizon, position size, and what would change your mind.
- Choose 3–5 principles from this Selling & Review set and write each as a yes/no check.
- Define 2–3 disconfirming signals (invalidation triggers) before you act.
- Record the inputs you used (numbers, sources, assumptions) so you can audit later.
4 principles·Selling & Review
4 Key Selling & Review Principles
#2
Don't Sell on Price Alone
"A stock that seems too high in price can still be a good hold if the company's growth prospects remain outstanding. Never sell just because the price has gone up."
Don't sell great companies just because the price rose.
Read Full Analysis →#3
Review Your Original Thesis
"Periodically review whether your original reasons for buying still hold. If they do, hold; if they don't, sell. The thesis, not the price, should drive the decision."
The original investment thesis should guide sell decisions.
Read Full Analysis →#4
Three Reasons to Sell
"Sell only when: 1) You made a mistake in original analysis, 2) The company no longer meets the fifteen points, or 3) A clearly better opportunity exists."
Sell only when original thesis breaks or better opportunities emerge.
Read Full Analysis →How to apply Philip Fisher's Selling & Review principles
Use this page as a workflow, not a collection of quotes. Pick 3–5 principles, translate each into a concrete check, and review your decisions on a fixed cadence. These are educational guardrails—always verify facts and match them to your own constraints.
- Clarify your decision: time horizon, position size, and what would change your mind.
- Choose 3–5 principles from this Selling & Review set and write each as a yes/no check.
- Define 2–3 disconfirming signals (invalidation triggers) before you act.
- Record the inputs you used (numbers, sources, assumptions) so you can audit later.
- Run the checklist when you feel urgency (FOMO, panic) and delay action if you cannot answer.
- Review outcomes on your cadence: what you followed, what you ignored, and what to adjust next cycle.
Boundaries and common misreads
- Don’t treat a principle as a buy/sell signal—convert it into evidence you can verify.
- Avoid “name-dropping” Philip Fisher: if you can’t explain the reasoning, you can’t borrow the rule.
- If the situation is outside your circle of competence, the right move is often to pass.
- Separate risk from uncertainty: write what could go wrong and what would confirm it.
- If two principles conflict, slow down and document the trade-off instead of forcing certainty.
Rehearse a scenario decision → ·Run a weekly toolkit → ·Browse all principles →
About Philip Fisher
Fisher is renowned for his "scuttlebutt" method of research – gathering information about companies by talking to customers, suppliers, competitors, and employees. This qualitative approach to understanding businesses complemented the quantitative methods prev…
Frequently Asked Questions
What are Philip Fisher's key selling & review principles?
Philip Fisher has 4 key principles on selling & review. The most important one is "Three Reasons to Sell" — There are only three valid reasons to sell: you made a mistake in your analysis, the company no longer meets your criteria, or you found a much better...
How does Philip Fisher apply selling & review in practice?
Philip Fisher applies selling & review through several key principles including "Three Reasons to Sell" and "Don't Sell on Price Alone". These principles guide practical investment decisions and have been tested across decades of market cycles.
What makes Philip Fisher's approach to selling & review unique?
Philip Fisher's approach to selling & review is distinguished by a focus on long-term thinking and fundamental analysis. With 4 specific principles in this area, Philip Fisher provides a comprehensive framework that investors at any level can study and apply to improve their decision-making.
How do I validate Philip Fisher's Selling & Review rules without blindly copying them?
Treat each principle as a hypothesis. Write the evidence you would need, collect it from primary sources when possible (filings, letters, transcripts), and note what would invalidate the conclusion. If you can’t define inputs and triggers, you’re not applying the rule—you’re quoting it.
What’s a practical review cadence for applying Selling & Review principles?
Pick a cadence you can sustain (weekly or monthly) and review process signals first: whether you followed your checklist, respected your boundaries, and documented assumptions. Only then look at outcomes. The goal is fewer low-quality decisions, not perfect prediction.
