How to Analyze a Stock
Six questions every investor should answer before buying — plus the red flags that show up before most people notice a problem.
Is the business getting bigger?
Growth is the first filter. A business that isn't expanding is slowly losing ground to inflation, competition, and changing markets. Before you look at anything else, you want to know whether this company is moving forward — and how fast.
Revenue Growth (YoY)
How much revenue increased compared to the same period last year.
Healthy signs
10%+ is strong. 20%+ is high-growth. Consistent growth over 5+ years is more meaningful than one great year.
Watch out for
Decelerating growth in a 'growth stock' is the most common reason valuations collapse — watch the trend, not just the number.
Revenue Trend
The multi-year arc of revenue — is it consistently rising, lumpy, or flat?
Healthy signs
Steady upward slope over 5–10 years. Even modest 7–8% annual growth compounding over a decade is transformative.
Watch out for
One strong year surrounded by flat years is noise, not a trend. Look for sustained, repeatable growth.
Gross Profit Growth
Revenue growth is good. Gross profit growing faster than revenue is better — it means the business is scaling efficiently.
Healthy signs
Gross profit growing in line with or faster than revenue.
Watch out for
Gross profit growing slower than revenue means margins are compressing — the company may be buying growth through discounts or rising input costs.
How good is the business model?
Revenue tells you how big the business is. Margins tell you how good it is. A company doing $10B in revenue at 2% net margin is a very different animal from one doing $2B at 25%. Margins reveal pricing power, operational discipline, and the fundamental quality of what the company sells.
Gross Margin
Revenue minus direct cost of goods or services — what's left before running the business.
Healthy signs
Software / SaaS: 70–80%+. Consumer brands: 40–60%. Retail / distribution: 20–40%. Higher means the product itself is valuable.
Watch out for
Declining gross margin is a structural problem — it means the company is losing pricing power or costs are rising faster than revenue.
Operating Margin
Profit after all operating costs (salaries, rent, R&D, marketing) — what the core business actually earns.
Healthy signs
>15% is efficient. >25% is excellent. Great businesses like Microsoft and Apple sustain 35%+ for years.
Watch out for
Operating margin far below gross margin means overhead is eating the business. Sales, admin, or R&D costs may be out of control.
Net Margin
The bottom line — what's left after taxes and interest, per dollar of revenue.
Healthy signs
>10% is solid. >20% is exceptional. Compare within the same industry — margins vary enormously by sector.
Watch out for
Net margin consistently near zero means the business is running to stand still. Any headwind (rate hike, cost spike) can push it into losses.
EBITDA Margin
Earnings before interest, taxes, depreciation, and amortization — a proxy for operating cash generation.
Healthy signs
Useful for comparing companies with different debt structures or depreciation policies. >20% is generally strong.
Watch out for
Don't use EBITDA as a substitute for free cash flow — it ignores real costs like CapEx. It's a comparison tool, not a final verdict.
Can it pay its bills this year?
Solvency is about the long run. Liquidity is about right now. A company can be fundamentally healthy — good products, loyal customers, profitable operations — but still go bankrupt if it runs out of cash to pay near-term obligations. Liquidity analysis asks: is there enough runway to survive the next 12 months?
Current Ratio
Current assets divided by current liabilities — how many dollars of short-term assets back each dollar of short-term debt.
Healthy signs
>2 is comfortable. >1 means it can cover obligations. Most healthy businesses operate between 1.5–3.
Watch out for
<1 means short-term liabilities exceed short-term assets — the company must borrow, raise equity, or sell assets to get through the year.
Cash on Hand
Raw cash and equivalents. How many months of operating expenses can the company cover without raising new money?
Healthy signs
At least 6–12 months of burn for growth companies. Established profitable businesses typically hold 1–2 quarters of revenue.
Watch out for
Cash falling rapidly quarter-over-quarter in a money-losing company is the clearest sign of a liquidity crisis forming.
Working Capital
Current assets minus current liabilities — the short-term financial cushion.
Healthy signs
Positive working capital with a growing trend. Many great businesses (like Amazon) have negative working capital by design — customers pay before suppliers are paid.
Watch out for
Negative working capital outside of a deliberate business model (like retail or subscription) is a stress signal.
Can it survive the long term?
Debt is not inherently bad — it's cheap capital that can amplify returns. The question is whether the debt load is manageable if conditions worsen. This section asks the stress-test question: if revenue dropped 30% for two years, would this company survive? The answer lives in the balance sheet.
Debt / Equity
Total debt divided by shareholder equity. How leveraged is the company relative to its own capital base?
Healthy signs
<1 is conservative. Between 1–2 is common in capital-intensive industries. Some sectors (utilities, real estate) routinely operate higher.
Watch out for
>3 in a cyclical business is dangerous — an earnings downturn can wipe out equity and make the debt unpayable.
Debt / EBITDA
How many years of earnings (before non-cash items) would it take to repay all debt.
Healthy signs
<2x is comfortable. Between 2–4x is manageable. Widely used by credit analysts and lenders as a standard check.
Watch out for
>5x means the company is heavily leveraged. A bad year could make debt service unsustainable without refinancing.
Interest Coverage (EBIT / Interest)
How many times over can the company cover its interest bill from operating earnings.
Healthy signs
>5x is strong. Between 3–5x is adequate. The business can absorb a meaningful earnings decline and still service debt.
Watch out for
<1.5x is a danger zone — one bad quarter and the company may struggle to meet interest payments. Below 1x means it's already burning capital to pay interest.
Net Debt
Total debt minus cash on hand — the true economic debt burden.
Healthy signs
Companies with large cash hoards may carry significant gross debt but negligible net debt (Apple is the classic example).
Watch out for
Always use net debt, not gross debt. A $5B debt load with $4.5B in cash is very different from $5B debt with $100M in cash.
Are the earnings real?
Net income is an accounting number. Cash flow is reality. Companies can legally boost reported earnings using accruals, capitalization choices, and timing of expenses — none of which require fraud. Cash cannot be faked. Either money hits the bank account or it doesn't. This is the single most important section for separating high-quality businesses from ones that merely look profitable on paper.
Operating Cash Flow (OCF)
Cash actually generated by running the business — before investment spending or financing.
Healthy signs
Should be consistently positive and growing in line with net income for a healthy business.
Watch out for
Net income growing while OCF shrinks is the most reliable early warning sign of earnings quality problems. It almost always means revenues are being booked before cash is collected.
Free Cash Flow (FCF)
Operating cash flow minus capital expenditures — the cash available after maintaining and growing the asset base.
Healthy signs
Consistently positive FCF is the hallmark of a great business. FCF is what funds buybacks, dividends, acquisitions, and debt repayment.
Watch out for
Negative FCF for years without a credible path to positive FCF is a structural problem, not a growth investment.
FCF Conversion (FCF / Net Income)
What percentage of reported net income actually shows up as free cash flow.
Healthy signs
>80% consistently means earnings are high quality — nearly every dollar of reported profit is real cash. >100% is exceptional.
Watch out for
<50% consistently means something is eating the profit — aggressive CapEx, deteriorating receivables, or accounting choices. Investigate further.
CapEx as % of Revenue
How much the company must reinvest in physical assets to sustain and grow revenue.
Healthy signs
Asset-light businesses (software, services, platforms) spend 2–5% of revenue on CapEx, leaving most FCF available. This is a structural advantage.
Watch out for
Capital-intensive businesses (airlines, manufacturing, telcos) spend 10–20%+ and generate less FCF per dollar of revenue — not bad, but requires a higher bar for returns.
Is management using capital well?
Two companies in the same industry with the same revenue can deliver very different returns for shareholders depending on how efficiently they deploy capital. A business that earns 25% on the capital it invests compounds wealth rapidly. One that earns 6% barely beats the cost of that capital. Efficiency ratios reveal this difference.
Return on Equity (ROE)
Net income divided by shareholder equity — profit generated per dollar of equity invested.
Healthy signs
>15% is solid. >20% is excellent. Sustained 20%+ ROE over a decade is the signature of a compounding machine.
Watch out for
ROE can be inflated by heavy debt (leverage artificially boosts this number). Always check alongside debt levels — high ROE with high debt is not the same as high ROE with low debt.
Return on Assets (ROA)
Net income divided by total assets — how efficiently the asset base is being used to generate profit.
Healthy signs
>5% is reasonable across most industries. >10% is strong. Asset-light businesses naturally score higher.
Watch out for
Declining ROA over time means the company is deploying more assets to produce the same or less profit — a sign of diminishing returns on investment.
Return on Invested Capital (ROIC)
The gold standard. Operating profit after tax divided by total invested capital (debt + equity). Shows whether the business creates or destroys value.
Healthy signs
ROIC above the company's cost of capital (roughly 8–10% for most large companies) means every dollar invested creates more than a dollar of value.
Watch out for
ROIC below cost of capital means growth actually destroys value — the company would be better off returning cash to shareholders than reinvesting it.
Shares Outstanding Trend
Whether the share count is rising (dilution) or falling (buybacks) over time.
Healthy signs
Declining share count means management is returning capital confidently. Per-share metrics (EPS, FCF/share) grow even if absolute profits are flat.
Watch out for
Rising share count every year means shareholders own a smaller slice of the same pie. EPS growth can mask this — always check the share count trend.
What to watch before it's too late
These patterns show up in the numbers before problems become obvious to the market. None of them guarantee disaster — but every one of them warrants a deeper look.
Revenue growing, cash flow shrinking
If revenue rises but operating cash flow falls or stagnates for 2–3 years, the earnings are likely accrual-driven. Cash will eventually demand a correction.
Accounts receivable growing faster than revenue
The company is booking sales before collecting payment. This can mean customers are struggling to pay, or that the company is pulling future revenue into the present quarter — a classic earnings manipulation pattern.
Gross margin declining while revenue grows
The business is buying growth through price cuts, discounts, or rising input costs. Eventually margins compress enough that the growth becomes unprofitable.
Debt rising while FCF stays flat or falls
A business that needs to borrow more each year just to sustain operations is not self-funding. External capital becomes a dependency, not a tool.
Share count increasing every year
Persistent dilution quietly transfers wealth from existing shareholders to new ones (often employees via stock comp, or the company itself via secondary offerings). EPS growth can mask this entirely — check shares outstanding.
Interest coverage below 2x
The company earns less than twice what it pays in interest. A 20% revenue decline — common in a recession — could make debt payments unsustainable. Very little margin of safety.
Goodwill growing rapidly without revenue to match
Goodwill appears when a company overpays for acquisitions. Serial acquirers that grow goodwill without growing revenue or earnings are destroying shareholder value through bad deals.
Ready to apply it?
Pick any stock and walk through each section using the charts.