How to analyze a stock before you buy: the thirty-minute checklist

Most investors do their analysis after the purchase. They buy because the company is in the news, because a friend owns it or because the chart looks right, and only then start looking for reasons. The checklist below reverses the order. It takes about thirty minutes for a company you have never looked at, less once the routine is familiar, and it ends in one of three outcomes: buy, watch, or pass. The same eight questions work for a global brand and for a small company nobody covers. Throughout, an imaginary company - Example Co, the same one as in the guide to financial statements - serves as the worked example.

Question 1: what does the company do, and why do customers pay for it

Before any number, write three sentences: what the company sells, who buys it, and why they choose it over the alternatives. If the third sentence is hard, you have found the first thing to investigate. A business you cannot describe is a business you cannot judge, and no multiple will rescue a purchase made without this step.

Then ask what protects the business. Does it have something competitors cannot easily copy - a brand customers ask for by name, a network that grows more useful with every user, switching costs that make leaving painful, a cost advantage from scale, a licence or a patent? A company with none of these can still be a fine investment, but it will have to compete on price forever, and its margins will say so.

Question 2: does it earn, and is the earning growing

Open the financials and look at five years, not one. Three lines matter at this stage: revenue, operating income and net income. You want revenue growing, operating income growing at least as fast, and net income that follows without one-off items doing the work. The margins turn these into a story: a rising operating margin on rising revenue is a business that is getting stronger. A falling one is a business buying its growth.

Example Co grows revenue by roughly 8 % a year while the operating margin rises from 12 % to 15 %: earnings grow faster than sales, which is what operating leverage looks like. If the margin had fallen while revenue rose, the next question would be why - price cuts, rising costs, a weaker mix - and whether the trend will stop. The guide to financial statements explains each line and where the one-off items hide.

Question 3: what does it owe, and does the profit turn into cash

Two numbers from the other two statements. From the balance sheet, net debt - debt minus cash - and how many years of operating earnings it would take to repay it (net debt to EBITDA). From the cash flow statement, free cash flow next to net income: a company whose cash lags its profit year after year is either investing heavily or reporting earnings that are not there. Example Co carries net debt of 200 against EBITDA of 200, one year of earnings, and turns 100 of net income into 80 of free cash flow. Both are comfortable.

• Net debt to EBITDA above three deserves an explanation - acceptable for a utility, a warning for a cyclical manufacturer.
• Free cash flow well below net income for several years means the profit is paper until proven otherwise.
• Interest coverage below three means a bad year could become a question of survival.

Question 4: what does the price already assume

A good company is not automatically a good investment, because the price has to leave room. Three comparisons answer whether it does. The first is the stock's own history: a company trading at a P/E of 15 after averaging 18 for five years is cheaper than usual, which is interesting if nothing has deteriorated and a warning if something has. The second is the closest peers: the same multiple next to companies with similar growth and margins. The third is Bulios Fair Price, which estimates what the shares are worth by several methods at once - a reference point for the gap between price and value, never a price target.

Example Co trades below its own history and below its peers on every measure while its margins are rising. That is the pattern worth a closer look: either the market has a reason - a lost customer, a lawsuit, a competitor with a cheaper product - or it has not noticed. Question 6 is where you find out which.

Question 5: what would prove you wrong

Every purchase rests on a thesis, usually unspoken: "earnings will keep growing", "the margin will recover", "the market will notice". Write it down in one sentence, then write the three things that would show it is false. Not vague risks like "a recession" - concrete events you could check in the next annual report: a margin below 13 %, a top customer leaving, debt rising to fund a buyback. This list is what makes the next earnings report readable: instead of reacting to the headline, you check your three items.

Question 6: what does the market know that you do not

Before you decide, spend five minutes on what has happened lately. The last two earnings reports and the guidance that came with them. News from the past months - a lost contract, a new regulation, a management change. Whether insiders have been buying or selling their own shares. And what other investors are saying about the company, read as a list of arguments to test. If the stock is cheap, this is where the reason usually shows up. If no reason appears, the gap between price and value is yours to use.

Question 7: buy, watch, or pass

The checklist ends in one of three places, and the middle one is the most useful. Buy when the business is understood, the numbers hold, the price leaves room and nothing in question 6 explains the gap. Watch when the business is good but the price is full, or when one test from question 5 is close to failing: put it on the watchlist with a note and a price alert, and let the next report decide. Pass when you could not describe the business, the cash does not follow the profit, or the debt makes a bad year dangerous. Passing is a normal result, and most companies analyzed should end here.

Even a yes comes with a size. A first position in a single stock should be small enough that being wrong costs you a lesson rather than a year - for most portfolios that means a few percent, and no single company above a tenth of the whole. You can always add after the thesis survives a report or two; you cannot un-buy a position that was too big.

Question 8: when do you look again

An analysis is a snapshot. The company reports four times a year, and each report is the moment to reread your thesis and its three tests - not the daily price. If the tests pass, nothing needs doing. If one fails, the question is whether the thesis is broken or merely delayed, and that is a decision to make calmly, with the note you wrote in question 5 in front of you. Between reports, the price moving is not information about the business.

The checklist on one page

Where to go next

This checklist is the routine; the stock analysis track is the depth behind each question. The first level covers the statements and the basic multiples, the second the quality of earnings and the valuation methods, the third discounted cash flow and the accounting red flags that the eight questions can only hint at. The Bulios Certification at the end of the track tests exactly this craft.