The Three Sentences to Write Before Buying Any Stock
Updated: 4 days ago
A weak stock idea often sounds smart in the moment. A strong one can survive being written down.
Before buying a stock, write three sentences. Not a valuation model. Not a five-page memo. Just three clear lines that force the idea out of your head and onto paper:
“I believe this asset will create value because...” “The verifiable facts supporting this idea are...” “I will re-examine my reasoning if...”
That small habit does two useful things. It slows down the urge to act, and it creates a record of what the decision was really based on. Weeks or months later, when the price has moved and emotions are louder, the written version becomes hard to fool.
This article is for information only and is not financial advice. Stocks can fall sharply, and every investor needs to make decisions based on their own situation, time horizon, and risk tolerance.
The first sentence names the reason the stock should create value
The first sentence is the heart of the idea:
“I believe this asset will create value because...”
This sentence should explain why owning the stock could make sense as a business decision, not merely why the share price might rise next week.
A poor version sounds like this:
“I believe this asset will create value because everyone is talking about it.”
That is not a thesis. That is a description of attention.
A better version sounds like this:
“I believe this asset will create value because the company sells a product customers keep buying, has room to raise prices without losing too much demand, and can reinvest profits at attractive returns.”
That is still simple, but it gives the idea structure. It points to customers, pricing power, and reinvestment. Those are business reasons.
Another example:
“I believe this asset will create value because the market is treating a temporary earnings decline as permanent, while the company’s core service remains essential and cash-generative.”
That sentence says the opportunity comes from a gap between perception and reality. It also gives a direction for later research. Is the decline really temporary? Is the service really essential? Is the business still producing cash?
The first sentence should answer three questions.
What is the source of value
A stock creates value only if the business behind it becomes more valuable, returns cash to owners, or the market later pays a higher price for the same stream of profits.
That value may come from:
Growing sales without destroying margins
Improving profitability after a difficult period
Returning cash through dividends or buybacks
Owning rare assets that are hard to replace
Selling below a reasonable estimate of intrinsic value
The sentence does not need to use advanced language. It needs to be specific enough to test.
What has to go right
Every stock idea depends on something. A bank may depend on credit quality. A retailer may depend on inventory control. A chip company may depend on heavy demand from a few large buyers. A dividend stock may depend on stable cash flow.
Writing the first sentence forces that dependence into view.
If the sentence says, “because demand will grow,” then demand matters. If it says, “because margins will recover,” then margins matter. If it says, “because the balance sheet is strong,” then debt levels and cash flow matter.
This sounds obvious, but many investors buy first and define the thesis later. That makes it easier to confuse a price rise with being right.
How long the idea may need
A stock can be a poor short-term trade and still become a good long-term investment. The reverse is also true.
The first sentence does not need an exact holding period, but it should hint at the timeframe. A turnaround may need years. A short-term mispricing may need only one or two events. A dividend idea may depend on long-term income rather than quick price movement.
If the only reason to buy is “the chart looks strong,” that is a different kind of decision from buying because the business can compound earnings over time. Both require discipline, but they should not be mixed.
The second sentence separates evidence from opinion
The second sentence is where the idea either becomes more credible or starts to fall apart:
“The verifiable facts supporting this idea are...”
This sentence matters because the investing brain loves stories. Stories feel complete even when the evidence is thin.
A story says:
“This company is the future.”
A fact says:
“Revenue has grown in recent years, gross margins have stayed stable, and the company has reduced debt.”
A story says:
“The dividend is safe.”
A fact says:
“Free cash flow has covered the dividend in most recent years, and debt maturities appear manageable based on published filings.”
The second sentence should include facts that another person could check. If someone cannot verify it, it does not belong in this line.
Good facts often come from:
Annual reports and interim reports
Balance sheets and cash flow statements
Investor presentations, used carefully
Dividend history
Debt maturity schedules
Segment revenue and margin data
Market share information from credible sources
Regulatory filings and official company statements
The key word is verifiable. A chief executive saying the future is bright is not enough. A company gaining customers while keeping margins stable is stronger evidence. A low price-to-earnings ratio is a fact, but it is not enough by itself. It might signal value, or it might signal that earnings are about to fall.
A useful second sentence might read:
“The verifiable facts supporting this idea are that the company has produced positive free cash flow for several years, reduced net debt, maintained a dividend covered by earnings, and continued to grow its main product line.”
That sentence gives the investor something to monitor. It does not guarantee success, but it keeps the claim grounded.
Keep facts and forecasts apart
A common mistake is to treat forecasts as facts.
This is a fact:
“The company reported €500 million in revenue last year.”
This is a forecast:
“The company will reach €750 million in revenue within three years.”
Forecasts are not bad. Investing requires some view of the future. But a forecast should not be smuggled into the fact sentence.
A clean version would say:
“The verifiable facts supporting this idea are that revenue has grown in recent years, customer retention has remained high, and management has guided for further expansion.”
The guidance is still not a guarantee, but the sentence makes clear what is reported history and what comes from management’s stated expectations.
Check whether the facts are enough
The second sentence should also reveal when the evidence is too weak.
If it reads like this:
“The verifiable facts supporting this idea are that the share price has fallen, the product is popular, and the company has been mentioned often in the press.”
That may not be enough.
A falling share price is not proof of value. A popular product is not proof of profits. Press attention is not proof of durable advantage.
Better evidence connects popularity to economics. Do customers renew? Does the company earn attractive margins? Does growth require constant borrowing or share issuance? Does the business produce cash, or only adjusted profit?
A stock idea improves when the evidence touches the actual engine of the business.
The third sentence protects you from defending a bad idea
The third sentence is the most uncomfortable one:
“I will re-examine my reasoning if...”
This is where investors protect themselves from stubbornness.
The point is not to panic every time the price falls. The point is to name the conditions that would weaken the original thesis. A lower price alone may not change the reasoning. In some cases, it may make the stock more attractive. But a broken thesis is different from an unpleasant price move.
A weak third sentence says:
“I will re-examine my reasoning if the stock goes down.”
That may encourage emotional selling.
A stronger version says:
“I will re-examine my reasoning if revenue growth stalls for several quarters, gross margins decline without a clear temporary cause, or debt rises faster than cash flow.”
That gives clear triggers. They link back to the original thesis.
The third sentence can include several types of review triggers.
Business triggers
These relate to the company itself.
Examples include:
Sales decline in the main business line
Margins fall for reasons that appear structural
Debt increases while cash flow weakens
A key customer leaves
Management changes the strategy in a major way
The company issues shares repeatedly to fund normal operations
These triggers work best when they connect to the first sentence. If the thesis depends on high customer loyalty, then a rise in cancellations matters. If the thesis depends on a strong balance sheet, then sudden borrowing matters.
Valuation triggers
Sometimes the business performs well, but the price becomes too high for the likely return.
A third sentence can say:
“I will re-examine my reasoning if the share price rises to a level where future returns depend on unusually high growth assumptions.”
That does not mean selling automatically. It means checking the math again.
This matters because good companies can become poor investments at extreme prices. The quality of a business and the attractiveness of its stock are related, but they are not the same.
Behaviour triggers
Some triggers are about the investor, not the company.
For example:
“I will re-examine my reasoning if I cannot explain the thesis in plain language after reading the latest report.”
Or:
“I will re-examine my reasoning if I find myself ignoring negative information because I want the stock to recover.”
These are valuable because many mistakes come from identity and emotion. Once someone says “I am a long-term shareholder,” it can become hard to admit that the facts changed.
A written review trigger gives permission to think again.
The three sentences work because they create a record
Memory is flexible. After a stock rises, it is easy to claim the thesis was obvious. After it falls, it is easy to say the market is irrational. A written note makes that harder.
The three sentences create a small investment journal. Over time, that journal becomes useful in ways a watchlist cannot.
It can show patterns such as:
Buying based on excitement rather than evidence
Underestimating debt
Overestimating growth
Selling too fast when the thesis remains intact
Holding too long after the thesis has changed
Confusing a cheap stock with a good stock
This is where the habit becomes more than a pre-purchase checklist. It becomes a feedback tool.
If several losing investments shared the same weak second sentence, the problem may be research quality. If several mistakes ignored the third sentence, the problem may be discipline. If the first sentence often depended on vague claims, the problem may be unclear thinking.
The goal is not to avoid every loss. No process can do that. The goal is to make losses more informative and successes less random.
A simple template to use before buying
Here is a practical template:
I believe this asset will create value because [Write the main business reason, valuation reason, or income reason in one sentence.] The verifiable facts supporting this idea are [List the reported numbers, observable trends, and credible evidence that support the thesis.] I will re-examine my reasoning if [Name the business, valuation, or behaviour triggers that would weaken the thesis.]
Here is a complete example for a fictional company:
I believe this asset will create value because the company sells a necessary service with recurring demand, has kept customer losses low, and trades at a price that does not appear to reflect steady cash generation. The verifiable facts supporting this idea are that recent annual reports show positive free cash flow, moderate debt, stable operating margins, and a dividend that has usually been covered by earnings. I will re-examine my reasoning if customer losses rise, free cash flow no longer covers the dividend, debt increases without a clear investment case, or the valuation rises beyond a level supported by conservative assumptions.
This is not a full analysis. It is a filter. It helps decide whether more research is worth doing and whether the eventual purchase rests on clear thinking.
Common mistakes when using the three sentences
The method is simple, but it can still be weakened.
One mistake is writing sentences that are too broad. “This is a great company” does not help. Great in what way? High margins? Strong brand loyalty? Low capital needs? Better distribution? A sentence should point to the feature that matters.
Another mistake is using price action as evidence. “The stock is up 20%” may prove that other buyers arrived. It does not prove the company is worth more. Price can confirm momentum, but it cannot replace business analysis.
A third mistake is refusing to update. The third sentence has no value if it is ignored. Re-examining does not always mean selling. It means reading the new evidence without protecting the old story.
The final mistake is demanding certainty. The three sentences will not remove risk. They only make the risk clearer. Investing always involves incomplete information. The aim is to know what you believe, why you believe it, and what would make you think again.
The real benefit is slower, cleaner thinking
The market invites speed. Prices move all day. News arrives in fragments. Strong opinions appear everywhere. A simple written process creates distance from that noise.
Before buying any stock, write the three sentences by hand or in a note. If the first sentence feels vague, the thesis is not ready. If the second sentence lacks verifiable facts, the research is not ready. If the third sentence has no review trigger, the discipline is not ready.
The best part is that the habit takes only a few minutes. It can prevent impulsive decisions, improve later reviews, and make each investment more honest.
A stock purchase should begin with a clear claim, clear evidence, and clear conditions for changing your mind. Those three sentences will not make every investment profitable, but they can make every decision more deliberate.
Turn the Three Sentences Into a Living Investment Thesis
Those three sentences give you a starting point. The next challenge is keeping that reasoning useful as new facts emerge.
PerCapita Asset Intelligence helps you take the next step: structure the thesis, challenge its assumptions, compare alternatives, identify what could prove you wrong, monitor what changes and reassess the reasoning over time.
ANALYZE → CHALLENGE → COMPARE → WATCH → REASSESS → REMEMBER
Your investment idea should not disappear into a note after you buy.
Turn it into a decision record you can return to.
BUILD YOUR ASSET THESIS →
Comments