Sector strength: where is the money going?

Breadth tells you whether today belongs to buyers or sellers. Sectors tell you where they are busy. Money tends to move into and out of groups of related companies together: banks on a rate surprise, metals on a commodity move, IT on a currency swing. A stock moving with a strong sector usually has more behind it than one moving on its own.

How Live Flow builds the sector panels

Each F&O stock is placed in a sector using NSE's industry classification, shortened to names such as Banks, IT, Auto, Metals or Pharma (Banks are separated out of Financials). For every sector, Live Flow works out:

• the average change of its F&O stocks from yesterday's close (a simple average: each stock counts once, whatever its size)
• how many of them are up and how many are down
• the sector's estimated buy share: the volume-weighted average of its stocks' buy share (lesson 6 explains the estimate)

The Positive sectors and Negative sectors panels list sectors from strongest to weakest by that average.

Why sectors matter for one stock

Imagine two stocks, each up 2%. One is in a sector where eleven of twelve stocks are up. The other is the only gainer in a sector where everything else is falling. The first is riding a broad flow of money; the second is moving on something specific to it, such as news or a large order, which can stop as suddenly as it started. Neither is "right", but they behave differently, and the first usually has more company if the move continues.

Practical habits:

• On a bullish day, look first at stocks in the top two or three sectors.
• On a bearish day, look first at the bottom sectors.
• Treat a stock moving against its own sector with extra caution, and ask what is driving it.

Traps to watch for

1. Small sectors. A sector with only three F&O stocks can top the list because one of them jumped. Check the up/down count before believing the average.
2. The average hides spread. A +1% sector can be half the stocks at +3% and half at −1%.
3. Leadership rotates. The strongest sector at 10:00 is not always the strongest at 14:00. Re-check before each new trade.
4. Sector moves are not forecasts. Strength today says where money went today; it does not say it will continue tomorrow, or even this afternoon.

Putting breadth and sectors together

1. The count tells you which side the market favours.
2. The sector panels tell you which groups lead on that side.
3. Only then do you look at individual stocks, which is where the next module begins.