# When to sell: the hardest decision _Most selling is provoked by the loudest signal in the room, the share price. The decision that actually matters is quieter: has the business changed, or only its quote?_ Neil Woodford · 23 June 2026 · 5 min read ![When to sell (the hardest decision)](https://cdn.sanity.io/images/v3acfbvo/production/1739b316eab7349887b0dc16da0c6464fb2fe29a-2240x1260.png?w=1600&fit=max&auto=format) --- When one of your holdings jumps in price, you might be faced with one of the hardest questions in investing. When a share moves up sharply, your instinct might be to grab the profit and run. Buying is the optimistic act. You have done the work, you like the business, and you commit. Selling is a different discipline where a decision should be motivated only when the original investment rationale no longer holds. The trouble is, keeping this discipline is not easy. The price is up, and greed says lock it in. The price is down, and fear says cut it. Either way, the loudest signal is the share price, and the share price is often the thing that tells you the least. ## The trigger that feels urgent carries little information In the short term, share prices are very noisy and volatile, moving for all sorts of reasons unrelated to the business underneath them. I have watched a holding fall around 20% in a single week for no reason I could identify, while the company itself carried on exactly as before. The value of the business had not changed. The price had. Those are two different facts, and confusing them is, in my experience, one of the most expensive habits a long-term investor can have. This is why I do not use stop losses, the standing instruction to sell automatically once a price falls by a set amount. A stop-loss can force a sale at the exact moment when the right response is the opposite: to take advantage of the volatility rather than be flushed out by it. It outsources the decision to the market, and the market is, in the short term, emotional, frequently irrational and not invested with any special insight. _(Neil in the margin: The article defines these inline, so I'll just add the wrinkle: stop losses are beloved of trend-following and momentum traders, whose entire method assumes price itself carries information. Neil is rejecting that premise, not just the tool.)_ The same objection applies, in reverse, to selling simply because a number is high. A UK bank stock rose more than 54% over a single year and remained, in my judgement, undervalued throughout that period. A 54% gain is not in itself a reason to sell, any more than it is a reason to buy. Price in isolation tells you little about value. What matters is the gap between the two, and that gap can be wider after a rise than it was before it. _(Neil in the margin: The point being made is a value-investing one: a rising price only overtakes value if value stands still. If earnings or the fair-value estimate rise alongside the price, the discount can persist or even widen after a big gain.)_ ## Three reasons that look the same and are not When the urge to sell arrives, it is worth being precise about which of these three things is actually happening, because they feel identical from the inside and demand quite different responses. The first is **noise**: the price has moved, sharply, and nothing about the business has changed. This is what we see on a Bloomberg screen on most days. It is not a sell signal. _(Neil in the margin: The Bloomberg Terminal is the standard professional data-and-news system, roughly £2,000 a month per user. Neil's point is that most of what flickers across it on any given day is exactly the noise he's telling you to ignore.)_ The second is a **price move past value**: the business is fine, often better than fine, but the share price has run so far ahead of any reasonable assessment of what the business is worth that the original investment case is no longer valid. The investment thesis has, in effect, completed. This is a genuine reason to sell, and it has nothing to do with whether the move was large or small, only with where the price now sits relative to value. The third is a **broken thesis**: the facts that made you buy have changed. The competitive advantage you were relying on has eroded, the management has made a decision that breaks the case, the end market has structurally shifted, the technology lead has gone. This is the most important sell trigger, and in my experience, the hardest to act on, because admitting a thesis has broken means admitting you were, at least partly, wrong. The discipline is to think about selling on the second and third of these, and to sit still through the first. The difficulty is that the noise is loud, and a broken thesis or overvaluation is harder to spot. ## What am I actually checking before I sell? When a holding lurches, trying to anticipate its next move would mean knowing the minds of every buyer and seller who has been active in the stock, and, in some cases, the minds of Donald Trump and several hundred American politicians voting on an energy bill. That is not something I can do. So I do not try. Instead, I go back to three questions that have nothing to do with the day's price. _(Neil in the margin: A nod to the fact that some holdings' prices swing on politics and regulation rather than fundamentals — utilities and energy names especially, where a single legislative vote can reprice the whole sector overnight.)_ Do I still understand the fundamentals of this business? Do I still know why it is in the portfolio in the first place? And, most important of all, do I still know what a fair valuation of the business looks like, and where the price sits relative to that? If the answer to all three is yes, then a price move, in either direction, is not a reason to act. It may even be a reason to do the opposite of what the noise is urging. If one of those answers has genuinely changed, that is your trigger, and it will be a fact about the business, not a number on a screen. You can, of course, trade the volatility if you enjoy it. Some people do. But these short-term decisions are, in my view, no better than guesses, and they tend to do two quiet kinds of damage. They rack up friction costs: the commissions and the bid-offer spreads that compound against you, the gap between the price you buy at and the price you sell at, every time you deal. And they erode your confidence in a well-founded long-term strategy, so that the next lurch finds you a little more rattled and a little more likely to do something you will regret. _(Neil in the margin: The bid-offer (or bid-ask) spread is the gap between the price at which you can buy and the lower price at which you can sell the same instant. You pay it on every round trip, which is why frequent trading quietly bleeds returns even before commissions.)_ ## The one catalyst worth waiting for Investors spend whole careers hunting for the catalyst, the event that will finally make a holding's price reflect its worth, and they sell when they lose patience waiting for one. I have said before that this hunt tends to be unrewarding. The only catalyst I genuinely believe in is valuation. If a business is good and the price is wrong, time tends to look after the rest, and the investor who is shaken out by the noise in the meantime does not collect. _(Neil in the margin: A catalyst is the specific event — results, a takeover, an index inclusion — that traders hope will force a cheap price up to fair value. Neil's heresy here is that you don't need one: if you're right on value, patience is the catalyst.)_ So the decision about when to sell is, in the end, mostly a decision about refusing to let the loudest input make the choice. Sell when the thesis breaks. Sell when the price has genuinely outrun the value. Sit on your hands when the only thing that has changed is the quote.