The financial metrics in a research note fall into five families: margins tell you how profitable a business is, cash flow tells you how real that profit is, multiples tell you how expensive the shares are, returns tell you how well capital is being used, and leverage tells you how much debt sits underneath. Read together they describe a business. Read alone, any one of them can mislead you.

A note will quote dozens of numbers. This module covers the ones that actually move a verdict, explains what each reveals, and shows why the scan only works when you read the whole dashboard rather than a single figure.

Read the dashboard, not a single number

Before any of the individual metrics, one habit is worth more than all of them, and almost everyone gets it wrong at the start.

The commonest analytical mistake is to fasten onto a single number. A low price to earnings ratio looks cheap right up until you notice the company is shrinking, at which point cheap turns out to have been a fair price for a business worth less each year. A fat margin looks healthy right up until you notice it is funded by borrowing.

Think of every metric that follows as a gauge on the same dashboard. No single gauge tells you whether the aircraft is flying well. What tells you is whether the gauges agree with one another, and the most valuable moment in any scan is when one of them disagrees with the rest.

The three margins: gross, operating and net

Margins ask a single question at three different depths: of each pound of revenue that comes in, how much is still there by the time we reach this line of the income statement?

Reading all three tells you not just how profitable a company is, but where the profit is made or lost.

• Gross margin. Revenue minus the direct cost of making the product. This is the closest thing to a measure of pricing power. A company that can charge well above what its product costs to produce has something the market values.
• Operating margin (EBIT ÷ revenue × 100). What survives after the cost of actually running the business, including salaries, premises and marketing. This measures operating efficiency rather than pricing.
• Net margin. The final profit after interest and tax. This is what genuinely reaches shareholders.

Now the useful part, which is reading the gaps rather than the levels. A wide gap between gross and operating margin says the product is profitable but the organisation around it is expensive, and overheads are eating the difference. A healthy gross margin sitting above a thin net margin usually points somewhere else entirely, to interest payments on debt. In both cases the margin figures alone would not have told you. The distance between them did.

EBITDA margin and the Rule of 40

EBITDA margin (EBITDA ÷ revenue × 100) removes depreciation, interest and tax so that two companies can be compared on core operating profitability without their financing and accounting choices getting in the way. That is its purpose and also its limitation. The costs it strips out are real, and depreciation in particular stands in for equipment that will eventually need replacing.

For growth and software businesses, analysts pair it with the Rule of 40, which says revenue growth rate plus profit margin should total at least 40%.

The reason this test exists is worth understanding, because on its own it looks arbitrary. A young company can justify thin profits if it is growing quickly, since it is deliberately spending today to be larger tomorrow. It can equally justify slow growth if it is highly profitable, since it is turning a mature position into cash. What it cannot justify is neither. A company growing 30% with a 15% margin totals 45 and passes. One growing 10% with a 5% margin totals 15 and does not, because it is neither expanding fast enough to matter nor printing enough cash to be valued as a mature business.

Free cash flow: the metric that is hardest to dress up

Free cash flow is the cash a business generates after the capital spending needed to keep running, so operating cash flow minus capital expenditure.

Analysts lean on it more heavily than on reported earnings, and the reason is worth being precise about. Reported profit involves judgement at many points, including when revenue is recognised, how quickly assets are depreciated and what is treated as a one-off. Every one of those judgements is legitimate, and every one of them gives management room to present a better number. Cash arriving in the bank involves far less judgement. That does not make free cash flow impossible to flatter, since deferring necessary capital spending will lift it for a year or two, but it is a much narrower opening.

Note the word persistently. A single weak year is often just a company building inventory or paying for a new factory, both of which are ordinary. It is the pattern across several years that carries the message.

Valuation multiples: how expensive is it?

Margins and cash flow describe the business. Multiples describe the price you are being asked to pay for it, by comparing that price to something fundamental. The answer is always of the form “so many pounds per unit of value”.

P/E is the most quoted of the three and the most abused. It fails completely for a loss making company, since dividing by a negative number produces nothing useful, and it is calculated inconsistently, with some sources using last year’s earnings and others next year’s forecast. Two P/E figures for the same company can differ substantially and both be honestly produced.

EV/EBITDA is harder to game, and the reason is in the numerator. Enterprise value counts the debt as well as the equity, so it prices the whole business rather than just the shareholders’ slice. A company can lower its P/E by borrowing to buy back its own shares, but it cannot lower its EV/EBITDA that way, because the debt it took on is added straight back in. This is why acquirers, who have to assume the debt when they buy, prefer it.

A last point that applies to all three. A multiple has no meaning on its own. It only means something against something else, whether that is the company’s own history, its direct peers, or its growth rate. “Trading on 18 times” is not a fact about value until you know what the alternatives trade on.

Returns: how well is capital used?

Return metrics ask a question the others do not. Not how much profit a company makes, but how much profit it wrings from the money invested in it. A business earning £10M on £50M of capital is doing something quite different from one earning £10M on £500M.

Return on equity (ROE) measures profit against shareholders’ funds. Return on invested capital (ROIC) measures it against all the capital in the business, debt included.

The gap between the two is where the lesson is. Borrowing lifts ROE almost mechanically, because debt adds to the capital doing the earning while the denominator of ROE counts only the equity. So a high ROE sitting next to a modest ROIC is not usually telling you the business is exceptional. It is telling you the balance sheet is doing the work, and a balance sheet can stop doing that work when lending conditions change.

One benchmark makes returns actionable. A company that earns less on its capital than that capital costs is destroying value as it grows, however good the growth looks in the revenue line. Growth is only worth having above that line.

Leverage: how much debt?

Leverage metrics measure financial risk, and the one you will meet most often is net debt to EBITDA. Read it as a rough number of years: how many years of current earnings it would take to clear the borrowings.

Below 1× is conservative. Between 1× and 3× is ordinary for many businesses. Above 3× to 4× the debt starts to constrain what the company can do when conditions turn, which is precisely when it would most like to have options.

Read it alongside interest cover, which asks how comfortably operating profit covers the interest bill. The two answer different questions, and the second is the more urgent. Net debt to EBITDA asks whether the debt can eventually be repaid. Interest cover asks whether it can be serviced this year. A company can survive a long time with a lot of debt. It cannot survive missing the interest.

The dashboard scan

Put the five families together and a healthy company tells one consistent story. Margins are solid and stable rather than lurching. Free cash flow tracks or exceeds reported earnings. Returns sit above the cost of capital. Leverage is at a level the business can service. And the valuation multiple is justified by the growth on offer.

What you are really scanning for is the sentence that does not fit. Rising profits alongside falling cash. High returns alongside heavy debt. An expanding margin alongside a shrinking market share. The contradiction is not noise to be smoothed over. It is almost always where the real story about the company is hiding, and finding it is the whole point of reading the dashboard rather than one gauge.