The picture in three lines
- Judge index moves in percent, not points: 300 points is a small move on one index and a large one on another.
- A share quote packs in price, change, range, volume, market value and valuation ratios such as P/E and yield.
- One day's move is mostly noise; breadth, sectors and the reason behind a move tell you more.
How to read the stock market starts with accepting that most daily movement is noise. The headline number, whether an index is up or down, is only the top layer. Underneath sit percentages, sector moves, individual quotes and the news that drove them. Read in that order, a market screen becomes a lot less dramatic and a lot more informative.
Points versus percent
Index moves are often reported in points, which can mislead. A 300-point move is 0.75% on an index standing at 40,000, but 3.75% on one at 8,000. Always convert to percent before comparing markets or days.
Formula: percentage move = points ÷ previous level × 100.
Illustrative example: an index closes at 4,800 and ends the next day at 4,860. That is 60 points, or 60 ÷ 4,800 = 1.25%. Also remember that indices are built differently: the price-weighted Dow Jones Industrial Average and Nikkei 225 react most to high-priced shares, while value-weighted indices such as the S&P 500 react most to the biggest companies. Our stock market guide shows the difference with a worked example.
What a share quote tells you
| Field | What it means |
|---|---|
| Last price | The price of the most recent trade |
| Change | Movement since the previous close, in currency and percent |
| Bid / ask | Best current prices to sell and to buy |
| Day range | Lowest and highest trades today |
| 52-week range | Lowest and highest prices over the past year |
| Volume | Number of shares traded today; compare it with the usual amount |
| Market value (capitalisation) | Share price × shares in issue |
| P/E ratio | Share price ÷ earnings per share over a year |
| Dividend yield | Annual dividend ÷ share price, as a percentage |
Illustrative example: a company with 500 million shares at $40 has a market value of $20 billion. If it earned $3 per share last year and the price is $45, the P/E is 45 ÷ 3 = 15. A $1.20 annual dividend on a $40 share is a 3% yield. Ratios are starting points for questions, not verdicts: a low P/E can signal value or trouble.
How to read the stock market beneath the headline
Fig. 2 · A five-step daily read
- PercentConvert the index move into percent and compare it with a typical day.
- BreadthCheck how many shares rose versus fell. A rise led by a handful of giants is narrower than it looks.
- SectorsSee which industries led and lagged; that points to the cause.
- CauseFind the news: data, central-bank comments, earnings or events abroad.
- ContextPlace the day against the past weeks and months before drawing any conclusion.
Breadth is the most overlooked of these. If an index rose 1% but more shares fell than rose, the gain came from a few large companies, and the average share had a poor day.
Volume and volatility: context for any move
A price move on unusually heavy volume carries more information than the same move on thin trading, because more buyers and sellers took part. Most quote screens show the day's volume next to an average; a figure several times the usual level suggests something specific has happened, such as results or a takeover report.
Volatility tells you how large a move is relative to normal. A 2% fall in a share that usually moves 0.5% a day is notable; the same fall in a share that often moves 4% is routine. Some markets publish volatility indices derived from options prices, which rise when investors pay more to protect against falls.
The daily relay: Asia, Europe, America
The trading day rolls around the globe. Tokyo, Sydney, Hong Kong and India trade first, Europe opens as Asia winds down, and New York trades from 09:30 to 16:00 local time. Futures on major indices trade outside those hours, which is why news reports talk about how markets are "set to open". Our live market board shows which exchanges are open right now.
Prices at the open often gap from the previous close because they absorb everything that happened overnight. Early trading after big news can be erratic; many longer-term investors simply ignore the first minutes.
Reading market news without overreacting
- Separate the event from the explanation. A report that shares fell "on growth fears" is an interpretation written after the fact.
- Check the size. A "plunge" of 1% is within the ordinary range for most indices.
- Watch expectations, not just results. Shares often fall on good earnings that were not as good as forecast.
- Mind the currency. A foreign index can rise in its own currency and fall in yours.
Charts in one paragraph
Most market screens show candlestick charts. Each candle covers one period and shows its opening, highest, lowest and closing price; a filled or red body usually means the close was below the open. Longer periods, such as weekly candles, smooth out much of the noise that dominates a single day. Charts describe what has happened; they do not reveal what will happen next.
If you use charts, pick one timeframe that matches how long you intend to hold, and resist switching to shorter ones when the price moves against you. A move that looks dramatic on a five-minute chart often disappears on a daily one.
Asked and answered
What is a good P/E ratio?
There is no single good number. Ratios vary with growth, interest rates and industry. Compare a company with its own history and with similar businesses, and remember that earnings can change quickly.
Why do markets move before they open?
Index futures and some pre-market trading continue outside regular hours, reacting to news and to other regions. The regular session then opens at a level that reflects those moves.
Should I check the market every day?
Only if it helps you. Daily moves are mostly noise for long-term investors, and checking often can encourage costly overtrading.
Sources
- Published trading hours of NYSE, Nasdaq, TSE, HKEX, ASX and NSE
- S&P Dow Jones Indices and Nikkei index methodology documents