Module 2 · Market Instruments · Lesson 5

Earnings

The single number that drives long-term stock prices.

In the short run, stock prices move on narratives, fear, and noise. In the long run, almost nothing matters except one thing: earnings. Earnings simply means net profit the money left over after a company pays its expenses, taxes, and costs. If a company’s earnings double over a decade, its stock will almost always follow. If a company’s earnings stagnate or fall, no marketing campaign, CEO charisma, or sector hype will save its share price.

Earnings — also called net income, net profit, or “the bottom line” — represent what remains after a company pays all its costs, taxes, and interest. They are the cash the business actually generated for its owners. Revenue is impressive. Earnings are real. A business with $100 billion in revenue and zero earnings is selling more than it costs to make. A business with $5 billion in revenue and $1 billion in earnings is twenty times healthier financially.

This lesson is the practical guide to reading earnings. Five metrics. One real case study. The traps that fool beginners. By the end you will be able to glance at a company and answer the only question that matters in the long run: is this business actually making money, and is it making more of it every year?

The price wobbles. The earnings climb. Over decades, the price has no choice but to follow. Investors who track earnings rather than prices get clarity on what they actually own. Investors who track prices get noise, anxiety, and the urge to trade.

Part One

Beginner visual framework

Simple explanation

The idea in plain English

Earnings show how much profit a company reports. Investors care about earnings because long term stock prices usually need long term profits to support them.

Worked example

How this looks in real investing

If revenue grows 20 percent but earnings are flat, costs may be rising. If earnings grow faster than revenue, margins may be improving.

Common beginner mistake

What to avoid

Looking only at the headline EPS number without checking revenue, margins, cash flow and management guidance.

Action step

Do this before moving on

For one company, compare revenue growth, operating income growth and free cash flow growth.

Quick checkpoint

Can you explain it simply? If not, slow down and reread the visual framework.

Can you apply it? Use the worked example as a template with a real company or fund.

Can you avoid the trap? The common mistake is the part most beginners overlook.

The five earnings metrics that matter

Hundreds of earnings-related metrics exist. Five carry 90 percent of the signal. If you understand these, you can evaluate any company in any industry.

01

Earnings Per Share (EPS) Profit, divided by the number of owners. Formula. EPS = Net Profit ÷ Total Outstanding Shares. If a company earns $1 billion and has 500 million shares, EPS is $2. EPS lets you compare profit on a per-share basis across companies of different sizes and across years. What to watch. Growing EPS is the cleanest signal of a healthy business. Falling or volatile EPS is a warning. Always check diluted EPS too — it includes potential new shares from stock options and convertibles, and is usually lower than basic EPS.

02

P/E Ratio How many years of profit are you paying for? Formula. P/E = Share Price ÷ EPS. A P/E of 20 means investors are paying $20 today for every $1 of current annual profit. It is the most-quoted valuation metric in investing. Rules of thumb. P/E of 5–15 is considered cheap; 15–25 is reasonable for a stable business; over 25 implies high growth expectations baked into the price. Buffett’s value-investing sweet spot historically sat in the 5–15 range. Compare to industry averages — software trades at higher P/Es than supermarkets, and that is fine.

03

Earnings Growth Rate How fast is the profit engine accelerating? Formula. Year-on-year growth rate: (Current Year EPS − Prior Year EPS) ÷ Prior Year EPS × 100. If EPS goes from $4 to $5, that is 25 percent growth. Track this over 5 to 10 years to spot trends rather than one-off quarters. What to watch. Steady 10–15 percent annual growth over a decade is far more valuable than a single 50 percent jump. Consistency compounds. Look for businesses where every year’s earnings exceed the previous year’s, not just the average.

04

Operating Margin How much profit per dollar of sales? Formula. Operating Margin = Operating Income ÷ Revenue × 100. A 25 percent margin means the company keeps $0.25 of every dollar in sales as operating profit. High and stable margins are the signature of strong businesses with pricing power. What to watch. Margins above 20 percent often indicate competitive advantage — pricing power, scale, or brand loyalty. Margins under 5 percent suggest a brutal commodity business with little room for error. Compare to industry averages; airlines run 5 percent, software can hit 40 percent.

05

Free Cash Flow The cash that actually shows up in the bank. Formula. FCF = Operating Cash Flow − Capital Expenditures. Earnings can be massaged through accounting choices. Cash flow is harder to fake — it is the actual money moving in and out. If reported earnings keep rising but FCF stagnates, look closely. What to watch. The best businesses generate FCF that exceeds reported earnings consistently. The worst businesses generate accounting profits but burn cash. Enron reported strong earnings for years while bleeding cash. The cash flow statement told the truth long before the share price did.

Part Two

Case study: Apple’s earnings, 2005–2024

The clearest example of earnings driving stock returns is Apple. In 2005, Apple’s EPS was around $0.10. By 2024, EPS had risen above $6.50 — roughly 35× growth over 20 years.

Part Three

How to read an earnings report in 15 minutes

Annual reports run hundreds of pages. You do not need to read them all. Five steps cover the signal.

One. Find the 10-K (annual) or 10-Q (quarterly) report. US companies file with the SEC at sec.gov/edgar. International companies post equivalents on their investor relations sites. The number you want is “Net Income” near the bottom of the income statement.

Two. Check the EPS trend over five years. Look at “Diluted EPS” for each of the last five years. Is it growing? Stable? Falling? A clear upward trend is the strongest signal. Volatile EPS suggests a cyclical business or fragile earnings.

Three. Compare operating margin against prior years and competitors. Operating income ÷ revenue. Rising margins suggest the company has pricing power or improving efficiency. Falling margins suggest cost pressure or competitive intensity.

Four. Compare cash flow to reported earnings. Find “Cash Flow from Operations” minus “Capital Expenditures.” If FCF tracks reported earnings, the earnings are real. If reported earnings keep rising but FCF stagnates, accounting is doing more work than the business is.

Five. Calculate the P/E ratio. Current share price ÷ trailing 12-month EPS. Compare to the company’s five-year average P/E and to the industry average. A historically low P/E with strong earnings growth is an opportunity. A historically high P/E with slowing growth is a warning.

Part Four

The earnings traps that fool beginners

Companies have decades of practice making earnings look better than they are. Watch for these five patterns.

One-off gains dressed as recurring earnings. A company that sells a building or wins a lawsuit reports the proceeds as profit. EPS jumps. The headline looks great. Recurring earnings have not changed. Always check whether the latest quarter included any non-recurring items, listed clearly in the notes.

Aggressive share buybacks pumping EPS. EPS can rise even with flat profits if the company buys back shares to reduce the denominator. This is not the same as real growth. Check whether net income (the top of the ratio) is actually growing or whether the company is just shrinking the share count.

Accounting choices that smooth earnings. Inventory methods, depreciation schedules, and revenue recognition rules can all be adjusted within legal limits. Compare cash flow to earnings. If they diverge persistently, something is being smoothed.

“Adjusted” or “pro forma” earnings. Many tech companies report “non-GAAP” or “adjusted” EPS that excludes “one-time” expenses — except many of those expenses recur every year (stock-based compensation, restructuring charges). Always check the GAAP number alongside the adjusted one.

Trap	Signal It’s Happening	Defence
One-off gains	Sudden EPS spike vs trend	Read footnotes to income statement
Buyback inflation	EPS rises, net income flat	Watch net income alongside EPS
Earnings smoothing	Reported earnings >> cash flow	Compare to operating cash flow
Adjusted EPS abuse	Big gap between GAAP and “adjusted”	Always read GAAP first
Peak-cycle profits	Record earnings in cyclical industry	Compare 10-year EPS average

Peak-cycle earnings that look permanent. Cyclical industries (mining, energy, semiconductors) produce huge profits at cycle peaks. Buying these stocks at peak earnings — when the P/E looks low — is one of the most expensive mistakes in investing. The next year, earnings may drop 50 percent and the “cheap” stock turns out to have been expensive.

Investor Wisdom

What the great investors said about earnings

Ten quotes on profit, patience, and the long arithmetic of compounding.

Beginner visual framework

Key Takeaways

Six things to take from this lesson

01	Earnings — net profit — are the long-run engine of stock prices. Track earnings before tracking prices.
02	Five metrics dominate: EPS, P/E ratio, earnings growth rate, operating margin, and free cash flow.
03	A P/E ratio shows years of profit you’re paying for. Compare across companies and time periods.
04	Free cash flow exposes accounting tricks. If reported earnings rise but cash flow doesn’t, look closer.
05	Apple’s share price tracked Apple’s earnings over 20 years. The pattern holds for almost every quality company.
06	Beware traps: one-off gains, buyback-inflated EPS, smoothed earnings, “adjusted” non-GAAP figures, peak-cycle profits.

Five Commitments

What you commit to before moving on

Read each one. If you cannot honestly commit to it, the lesson is not finished.

---

End of Lesson

Module 2 . Lesson 5 of 21 . Continue to Lesson 6 . Debt.