Stock Fundamentals 101: Market Cap, EPS, P/E and More

Stock fundamentals are the measurable facts about a company's business and finances: how big it is, how fast it is growing, how profitable it is, how much it owes, and how much investors pay for each dollar of earnings. Fundamental analysis uses these numbers to judge what a company is worth and how healthy it is, and it complements technical analysis, which studies price and volume.

You do not need an accounting degree to use them. About a dozen figures cover most of what a beginner needs, and they are found in a company's earnings release and its SEC filings. This guide explains each in plain English, shows a worked example, and describes how swing traders use fundamentals alongside charts. It is educational only, not financial advice. Numbers can mislead, past results do not guarantee future results, and you should manage risk and do your own research.

Key takeaways

• Market cap (share price x shares outstanding) measures a company's size and is a better comparison tool than share price.
• Earnings per share (EPS) is net income divided by shares outstanding, and the P/E ratio is price divided by EPS, which tells you how much investors pay per dollar of earnings.
• A P/E is only meaningful in context: compare it with the company's own history, its growth rate and its industry peers.
• Profit margins, debt levels and free cash flow show quality and risk that revenue and EPS alone hide.
• For swing traders, fundamentals are best used as a filter to avoid weak companies and to size risk, while charts handle timing.

What is fundamental analysis?

Fundamental analysis estimates a stock's value from the business behind it: revenue, profits, assets, debts, growth and competitive position. The central question is whether the price is reasonable for what the company earns and is likely to earn. It is the counterpart of technical analysis, which studies price patterns, trend and volume to judge what other traders are doing.

Fundamental vs technical analysis

They are not rivals. A stock can be a great business at a bad time, or a strong chart on a weak business. Using both reduces blind spots.

What is market capitalization?

Market capitalization (market cap) is the total market value of a company's shares: share price multiplied by shares outstanding. A stock at $50 with 100 million shares has a market cap of $5 billion.

It matters because share price alone says nothing about size. A $500 stock with 10 million shares ($5 billion) is the same size as a $5 stock with a billion shares. Common rough bands are:

• Large cap: about $10 billion or more. Generally more stable, tighter spreads.
• Mid cap: roughly $2 billion to $10 billion.
• Small cap: roughly $300 million to $2 billion. More growth potential and more volatility.
• Micro cap: below about $300 million. Thin liquidity, wide spreads, higher risk.

The cutoffs vary by source. For swing traders, size affects liquidity, volatility and how far a stop needs to be.

What is revenue, and why does growth matter?

Revenue (also called sales or the top line) is the money a company brings in from selling its products or services before subtracting any costs. Growth in revenue is the first sign of whether demand for the product is rising.

Look at the growth rate (this year's revenue divided by last year's, minus one) and the trend: is growth accelerating, steady or slowing? A company growing revenue 25 percent a year that slows to 10 percent will often see its stock re-rate even though the business is still growing.

What is earnings per share (EPS)?

Earnings per share is net income divided by the number of shares outstanding. If a company earns $200 million and has 100 million shares, EPS is $2.00. It lets you compare profitability across companies of different sizes and track progress per share over time.

Two cautions:

• GAAP versus adjusted EPS. GAAP follows accounting rules; adjusted (non-GAAP) EPS removes items management calls one-time, such as stock compensation or restructuring. Adjusted numbers can be useful or flattering, so read the reconciliation.
• Share count changes. Buybacks reduce shares and lift EPS even with flat profits; new share issuance does the reverse.

Markets react to EPS relative to expectations, not the number itself. A company that earns $1.10 when analysts expected $1.15 is a miss, even though profits grew.

What are profit margins?

Margins show what percentage of revenue turns into profit at each level, and they reveal pricing power and efficiency.

• Gross margin: (revenue - cost of goods sold) / revenue. Software firms often report very high gross margins, retailers much lower.
• Operating margin: operating income / revenue. Profit from the core business before interest and taxes.
• Net margin: net income / revenue. What is left for shareholders.

Compare a company's margins over several years and with its peers. Rising margins on rising revenue is a strong combination; falling margins on rising revenue means growth is being bought at the expense of profit.

What is the P/E ratio?

The price-to-earnings (P/E) ratio is the share price divided by earnings per share. It tells you how many dollars investors pay for one dollar of annual earnings. A stock at $40 with EPS of $2.00 has a P/E of 20.

• Trailing P/E uses the last 12 months' reported earnings.
• Forward P/E uses analysts' estimates of the next 12 months, which are projections and may be wrong.

What counts as high or low depends on growth and the industry. A fast-growing company may deserve a higher P/E; a slow or cyclical one a lower P/E. Negative earnings mean there is no meaningful P/E at all. The ratio is a comparison tool, not a verdict.

Other valuation ratios

Enterprise value (EV) is market cap plus debt minus cash, a measure of the whole business's price tag.

How do you judge balance-sheet health?

Look at debt, cash and the ability to meet short-term obligations. A profitable company can still fail if it cannot pay its bills.

• Debt-to-equity: total debt / shareholders' equity. Higher means more leverage, and interpretation varies by industry.
• Current ratio: current assets / current liabilities. Below 1 means short-term obligations exceed short-term assets.
• Interest coverage: operating income / interest expense. Low coverage means debt payments eat the profit.
• Cash versus near-term debt: how much debt comes due in the next year and whether cash covers it.

Cash flow matters too. Free cash flow (FCF) is operating cash flow minus capital spending, the cash left after running and maintaining the business. Profits that never turn into cash deserve a closer look.

Worked example (hypothetical numbers)

Company X trades at $60 with 80 million shares outstanding.

• Market cap: $60 x 80 million = $4.8 billion (mid cap).
• Revenue: $1.2 billion, up from $1.0 billion (20 percent growth).
• Net income: $96 million, so net margin = 8 percent and EPS = $96M / 80M = $1.20.
• P/E: $60 / $1.20 = 50.
• Debt: $600 million; equity $900 million, so debt-to-equity is about 0.67.
• Free cash flow: $40 million.

What this says: a P/E of 50 means investors are paying for continued fast growth. If growth slows from 20 percent to 8 percent, the P/E could compress, and the stock could fall even if earnings still rise. FCF of $40 million against $96 million of net income is a mild flag worth checking. Debt looks manageable. This is not a buy or sell signal; it is a way to frame the risk before choosing position size and stop.

How do swing traders use fundamentals?

Swing traders use fundamentals mostly as a filter and risk tool, since holds are days to weeks and the chart handles timing. Common uses:

• Screen out weak companies: avoid names with going-concern doubt, shrinking revenue or heavy near-term debt.
• Favor growth with acceleration: breakouts on stocks with rising revenue and earnings often have fuel.
• Know the catalyst calendar: earnings dates drive gaps; see should you hold stocks through earnings.
• Size for risk: low-quality, small-cap names move more, so use wider stops and smaller size; see where to place a stop loss.

Where do you find fundamental data?

The primary source is the SEC's free EDGAR database: 10-K annual reports, 10-Q quarterly reports and 8-K event filings. Company earnings releases and investor presentations summarize them. Most brokers and data sites show the ratios, but check the underlying filing when a number matters.

Common mistakes

• Judging by share price. A $5 stock is not cheap because it is $5. Use market cap and ratios.
• Treating P/E as a buy or sell signal. Cheap stocks can get cheaper; expensive stocks can run.
• Ignoring growth and context. Compare with peers and the company's own history.
• Trusting adjusted numbers blindly. Check what was excluded.
• Skipping the balance sheet. Debt turns a bad quarter into a crisis.
• Using fundamentals for timing. A good business at a bad price level can fall further. Use charts for entries.

The bottom line

Fundamentals tell you what you own: its size, growth, profits, debts and how richly it is priced. They will not tell you when to buy, but they help you avoid fragile companies and understand why a stock is moving. Pair them with price action: fundamentals for what, technicals for when and where.

StockSetups scans the full US-equities universe after the close for chart setups, and its paid plans add fundamentals, a 0 to 100 conviction score and market context beside each setup. Use them to shortlist, then do your own research before every trade.

To put the numbers to work, see how to read an earnings report and how to read a 10-K.