Earnings, revenue growth, and guidance

In the long run, a share price follows the company's ability to grow its profits. In the short run, it follows how those profits compare with what the market expected. This lesson gives you the financial vocabulary to read an earnings report without an accounting degree — and the single idea that explains most earnings-day moves: results are judged against expectations, and the future matters more than the past.

What you'll learn

• The core lines of an income statement: revenue, profit, and margins
• Earnings per share (EPS) and why it's the headline number
• How to read growth rates — year-over-year and quarter-over-quarter
• What guidance is and why it often moves price more than results
• How "beats" and "misses" versus consensus drive the reaction

1. From revenue to profit

A simplified income statement:

Margins

Margins show how much of each dollar of revenue becomes profit:

• Gross margin = gross profit ÷ revenue
• Operating margin = operating income ÷ revenue
• Net margin = net income ÷ revenue

(Illustrative.) Revenue $10 billion, operating income $2.5 billion → operating margin 25%.

Rising margins mean the company is keeping more of each sale — often a strong signal. Falling margins can reveal pricing pressure or rising costs even when revenue is growing.

2. Earnings per share (EPS)

EPS = net income ÷ number of shares

EPS makes profit comparable per share and is the headline number in almost every earnings report.

(Illustrative.) Net income $3 billion, 1.5 billion shares → EPS $2.00.

Companies often report two versions:

• GAAP (or IFRS) EPS — calculated under standard accounting rules
• Adjusted (non-GAAP) EPS — excluding items the company considers one-off

3. Growth rates

Investors pay for growth. Two common comparisons:

(Illustrative.) Revenue this quarter $10.8 billion vs $9.0 billion a year ago → YoY growth = (10.8 − 9.0) ÷ 9.0 = 20%.

The trend in growth often matters more than the level. A company growing 20% whose growth was 30% last quarter is decelerating — and markets frequently punish deceleration, even at healthy growth rates.

4. Guidance: the forward view

Many companies give guidance — their own forecast for the next quarter or year (for example "revenue of $11.0–11.4 billion next quarter").

Because share prices look forward, guidance is often the most important part of the report:

• Strong results + raised guidance → often a strong reaction
• Strong results + lowered or cautious guidance → the stock can fall anyway
• Weak results + reassuring guidance → the stock can hold up or even rise

The management conference call after the report adds colour — commentary on demand, costs, and risks — and can move the stock again.

5. Beats, misses, and expectations

Before each report, analysts publish estimates. Their average is the consensus. As with economic data (see Inflation, employment, and growth data), the market reacts to the surprise.

Worked example

(Illustrative.)

Headline: "Company beats on revenue and earnings." Share price reaction: down 8%. The results were good, but the guidance implied slower growth than the market had priced in.

Common beginner mistakes

• Reading only the EPS headline and ignoring revenue, margins, and guidance.
• Assuming a beat means the stock will rise.
• Trusting adjusted figures without checking what was excluded.
• Ignoring the growth trend — acceleration vs deceleration.
• Holding a large position into earnings without planning for a gap in either direction.

Key terms

Practice

1. Pick a large company and find its latest quarterly report. Record revenue, operating margin, EPS, and YoY revenue growth.
2. Compare each with the consensus estimate (many financial websites show this).
3. Find the guidance for next quarter. Was it above or below what analysts expected?
4. Check the share price reaction the next day. Which factor best explains it?

Quick recap

• Revenue flows down to profit; margins show how much of each sale is kept.
• EPS is the headline number; check whether it's standard or adjusted.
• Growth trends — accelerating or decelerating — matter as much as growth levels.
• Guidance often moves the price more than the results themselves.
• The market reacts to surprises versus consensus, not to results in isolation.