When to Sell (and Why Almost Never)
Three legitimate reasons to sell — and a deliberately contrarian argument that a rising price is not one of them.
Fisher's view on selling is famously strict, and deliberately at odds with a lot of conventional trading instinct: if a company still qualifies under the fifteen points to the same degree it did when you bought it, there is, in his own framing, almost never a good reason to sell it — including the reason most investors reach for most often, that the price has simply gone up a great deal.
He gives exactly three legitimate reasons to sell: the original purchase judgment was a mistake, and the facts have proven this since; the company no longer qualifies to the same degree on the fifteen points; or a clearly, substantially better opportunity exists that outweighs even a great existing holding — which he considers genuinely rare in practice.
What's conspicuously absent from that list: selling because the stock's price or P/E "looks high" by conventional standards. A truly outstanding company, correctly identified through the fifteen points, can go on compounding earnings for so long that a price that looked expensive at purchase can look cheap in hindsight years later — and selling out of a great company purely because of a valuation multiple risks giving up exactly the multi-year compounding the whole philosophy is built to capture.
| Reason | What it actually means |
|---|---|
| 1. The original judgment was a mistake | Facts since purchase have shown the fifteen-point analysis was wrong at the time, not just unlucky |
| 2. The company no longer qualifies | A real, visible deterioration in management, competitive position, or growth potential |
| 3. A clearly better opportunity exists | Rare in practice — the bar is a substantially better prospect, not just another reasonable one |
A company correctly identified as an exceptional fifteen-point business, bought at what looked like a full price, can go on to multiply its earnings many times over across the following decade.
The mechanism behind this is straightforward once stated: a P/E multiple compares price to a single year's earnings, but a genuine multi-year compounder's earnings keep growing, which means the multiple an investor is effectively paying relative to the company's earnings several years down the road can look entirely reasonable even when the purchase-day multiple looked demanding. Fisher's argument isn't that valuation never matters — it's that judging a genuine long-term compounder purely by its current-year P/E systematically understates how cheap the purchase can look in hindsight, once growth is given the years it needs to actually happen.
Looked at only through the lens of the original purchase-day P/E, that outcome would have led an investor to sell far too early and miss the vast majority of the eventual gain — Fisher's own experience with several long-held positions is the basis for this specific, deliberately contrarian rule.
Holding through the discomfort of a rising, seemingly expensive-looking price, and through ordinary market volatility, is emotionally much harder than it sounds — which is exactly why Fisher ties the sell decision back to the same fifteen-point framework used to buy, rather than to the price chart. If nothing about the business itself has changed, the price by itself isn't new information about the business.
This discipline is made harder still by a specific social pressure: a rising, seemingly expensive stock invites commentary from people convinced it's due for a fall, and being the investor still holding it can feel isolating or even reckless during a sharp pullback, regardless of whether the underlying fifteen points still hold up. Fisher's own answer is to keep the sell decision anchored entirely to a periodic re-check of the fifteen points, treating both the price's rise and outside opinion about it as irrelevant inputs to a question that was never actually about the price in the first place.
Read together, the buying and selling chapters describe a single, consistent discipline rather than two separate rules: both tie the decision to the same fifteen-point re-assessment, and both explicitly treat the price on its own — whether falling or rising — as insufficient grounds for action. An investor following Fisher's framework consistently ends up trading much less often than one reacting to price alone, which is itself the intended outcome, not a side effect — the multi-year compounding this whole philosophy is built around requires exactly that reduced trading frequency to actually play out.
- Fisher lists exactly three legitimate reasons to sell — a mistaken original judgment, genuine deterioration on the fifteen points, or a clearly superior alternative opportunity.
- A high price or P/E is explicitly not one of them — Fisher considered this one of the most common and costly mistakes investors make with genuinely great companies.
- The sell decision is tied to the same fifteen-point framework used to buy, not to the stock's price chart.
- A genuine multi-year compounder's earnings growth can make a purchase-day P/E that looked demanding look cheap in hindsight — judging it only by that starting multiple misses the whole point of the philosophy.
- This is a deliberately contrarian, demanding discipline — holding through discomfort and outside opinion is the hard part, not identifying the reasons to sell.