How to Analyze a Stock Before Buying: A 6-Step Framework

Before looking at a single number, answer these questions in plain English:

• What does the company sell, and who buys it?
• How does it make money — subscription, transaction, advertising, hardware?
• Is demand growing, stable, or declining?
• Could you explain the business to a 12-year-old in two sentences?

Warren Buffett calls this staying within your 'circle of competence.' If you can't describe how a company earns revenue, you can't evaluate whether it's doing it well.

Look at the last 3–5 years of revenue and earnings trends. Consistent growth matters more than any single quarter.

• Revenue growth: is it accelerating, stable, or slowing?
• Gross margin: is the company keeping more of each revenue dollar over time?
• Operating leverage: do margins expand as revenue grows? (That's a sign of a scalable model)
• EPS trend: is the company actually becoming more profitable per share?

Watch for revenue growth driven entirely by acquisitions — organic growth is much more meaningful. Also check whether earnings per share growth is boosted by buybacks reducing share count rather than genuine profit improvement.

A great business with a fragile balance sheet is a risky investment. Check:

• Debt-to-equity or net debt vs EBITDA: is the company over-leveraged?
• Interest coverage ratio: can earnings comfortably service debt?
• Free cash flow: is the company converting earnings into real cash?
• Cash on hand vs upcoming debt maturities: any near-term refinancing risk?

Free cash flow is the most important financial health signal. Companies that consistently convert over 80% of net income into free cash flow are usually doing something right.

A moat is a durable competitive advantage that protects future profits. Without one, any profit margin will eventually be competed away.

• Network effects: does the product get more valuable as more people use it? (Visa, Meta)
• Switching costs: is it painful for customers to leave? (Salesforce, Adobe)
• Cost advantages: can the company produce for less than any rival? (Costco, Amazon)
• Intangible assets: patents, brands, regulatory licenses? (J&J, Coca-Cola)
• Efficient scale: a natural monopoly in a limited market? (waste management, rails)

Moats aren't binary — they erode. Ask not just 'does a moat exist' but 'is it widening or narrowing?' A stock losing its moat is one of the most dangerous situations in investing.

Even a great business is a bad investment at the wrong price. Use multiple valuation lenses:

• Forward P/E: what are you paying for next year's earnings?
• EV/EBITDA: accounts for debt — useful for comparing capital-structure-heavy businesses
• Price-to-free-cash-flow: often the cleanest valuation metric
• PEG ratio: P/E divided by growth rate — adjusts for how much growth you're getting
• Compare to 5-year historical ranges: is the stock cheap or rich vs its own past?

No single metric captures full value. A cheap P/E with declining revenue is not a bargain. A high P/E with compounding free cash flow growth might be the best investment available.

Every investment thesis has a way it could be wrong. Write down the bear case explicitly:

• What would cause revenue to disappoint? (new competitor, regulatory change, pricing pressure)
• Is the stock pricing in perfect execution? What happens if a product launch disappoints?
• What's the debt situation if revenue drops 20%?
• Is the valuation supported by estimates that are achievable, or optimistic?
• Is there key-person risk (company heavily dependent on one founder or executive)?

The goal isn't to find a risk-free stock — it's to understand the risks clearly enough to decide if the expected return justifies them.