How to Read the Stock Market? Explained Simply

How to read the stock market starts with scale. A headline saying an index "fell 300 points" tells you almost nothing until you know the level of the index; a quote screen full of numbers is only useful once you know which of them describe the price and which describe the company.

How to read the stock market's headline number: points versus percent

News reports usually quote index changes in points, but indices sit at very different levels, so points are hard to compare. Convert to percent:

Weighting matters too. In a market-value-weighted index such as the S&P 500, a handful of very large companies can drive the day's number. In a price-weighted index such as the Dow Jones Industrial Average, the shares with the highest prices carry the most weight. Our stock market guide explains the main index families.

Reading a share quote, line by line

Illustrative example: a share that closed yesterday at $84.00 and now trades at $86.10 is up $2.10, or 2.10 ÷ 84.00 × 100 = 2.5%. If the company has 2 billion shares outstanding and the price were $45, its market capitalisation would be 2 billion × $45 = $90 billion.

Volume, breadth and sectors

Volume gives a price move context. A rise on heavy volume shows many participants agreeing; the same rise on thin volume, such as before a holiday, says less. Compare today's volume with the share's usual level, not with other companies.

Breadth measures how many shares rose versus fell. An index can gain while most of its members decline if a few heavyweights rally. Advance-decline figures and the number of new highs and lows make that visible.

Sectors show where money is moving. Banks, energy, technology and consumer staples respond differently to interest rates, commodity prices and growth expectations, so a day when defensive sectors lead tells a different story from one led by technology.

What drives a typical trading day

• Overnight news and other markets. Asian and European sessions, index futures and currency moves set the tone before New York opens at 09:30.
• Economic releases. Inflation, jobs and central bank decisions arrive on a published calendar.
• Company results. Earnings season can move individual shares by double-digit percentages in a day.
• The open and the close. Trading is usually heaviest in the first and last parts of the session, including the closing auction.

Moves in the dollar often show up in shares too; our forex guide covers what drives currencies.

Reading an earnings release

Company results move shares more than almost anything else. The headline numbers are revenue and earnings per share, but the price reaction depends on how they compare with what analysts expected, not on whether profits rose. Guidance, the company's own outlook for coming quarters, often matters more than the quarter just reported. A share can fall on record profits if guidance disappoints, or rise on a loss that was smaller than feared. Reading the release itself, rather than a one-line summary, shows which of these is driving the move.

Other markets on the same screen

Shares rarely move alone. Government bond yields influence how much investors will pay for future profits, so a sharp rise in yields often weighs on shares with high valuations. A stronger dollar can hurt US exporters and multinational earnings. Oil and metals prices feed into energy and mining shares. Gold often draws attention in stressed markets. A quick look at bonds, the dollar and commodities alongside the index usually explains more about the day than the index alone.

Pre-market, after-hours and futures

Some brokers offer trading outside the regular session. Prices there can be volatile because fewer participants are active, and a pre-market move does not always hold after the open. Index futures trade for most of the day and night, which is why they are often used as an early read on where the cash market will open.

Charts and what they show

A daily chart summarises each session as a candle or bar: open, high, low and close. Reading those patterns is the subject of our price action guide. Charts show what happened; they do not explain why, and patterns that look obvious in hindsight are far less clear in real time.

Signals worth ignoring

Single-day moves in a long-term holding, dramatic point changes without percent context, and social media claims about "what the market is telling us" are mostly noise. The information that lasts is in company results, interest rates and the broad direction of the economy.