market breadth
Market Breadth measures how many stocks are actually rising or falling in a market, more than what the headline index number says.
In plain English
Here is a mistake many people make without knowing it. They see the Nigerian Exchange All Share Index up two percent for the day, feel a warm glow, and assume the whole market is having a good time. But that single number can be lifted entirely by three or four heavyweight stocks like Dangote Cement or MTN Nigeria climbing hard, while forty other listed companies calmly fall or go nowhere. You checked the headline and made a call, maybe even bought something, without ever asking how many stocks were actually joining the party.
Market breadth is the tool that answers that exact question. Instead of looking at one index number, it looks at the crowd behind it, counting how many stocks advanced, how many declined, and how many stayed flat. A market where six hundred stocks rise and only one hundred fall is described as having strong breadth, a healthy, broad based rally. A market where the index rises but eight hundred stocks fall and only fifty rise has weak breadth, and that is often a warning sign that the rally is thin and fragile, resting on a handful of giants rather than genuine, widespread strength.
Think of a London street party where the news reports say the whole street is celebrating, but when you walk down it, you notice only three houses have their lights on and music playing while the rest are dark and calm. The headline told you one story, your own eyes told you another. Market breadth is that walk down the street.
People who trade or invest based on index levels alone can be caught out. A diaspora investor sending money home to buy Nigerian shares through a local stockbroker might see the index green and assume it is a good entry point, when breadth indicators would have shown the rally was narrow and possibly running out of steam.
On a day the All Share Index gains 1.8 percent, breadth data shows 120 stocks advanced, 210 declined, and 30 were unchanged. Despite the green headline number, more stocks fell than rose, telling an analyst the rally was narrow, likely driven by one or two large cap names, not a broad market move.
Questions people ask
Is market breadth only useful for professional traders?
No. Any investor can check it before buying, since it gives a fuller consider than the index alone and helps you avoid entering a market that looks strong on the surface but is weak underneath.
Where can a Nigerian investor find market breadth data?
Some local financial news sites and brokerage platforms publish advancers versus decliners data for the Nigerian Exchange daily, and international data providers offer similar figures for markets like the FTSE 100 or S&P 500.
Does weak breadth always mean a crash is coming?
Not always, but it is a caution flag. Weak breadth over several days or weeks often precedes a pullback, so it is worth watching rather than ignoring, even though it is not a guaranteed prediction.
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