There are two ways to arrive at a stock. You know the name and want to research it. Or you know the kind of situation you want and need to find instruments in it.
The second is harder, and it is where most people go wrong — not because the tools are difficult, but because they use one tool for a job that needs two.
The two questions are different
A screener answers: which instruments currently satisfy this condition? It works from the bottom up, filtering a large universe down to names that match a rule.
A heatmap answers: where is movement concentrated? It works from the top down, showing the whole market at once so structure is visible.
These are complements, not alternatives. A screener will tell you fourteen stocks are up more than five per cent. It will not tell you that eleven of them are in one sector, which is the single most important thing about that list.
Start top-down when you have no hypothesis
If you genuinely do not know what you are looking for, begin with the NIFTY 500 industry heatmap.
The heatmap gives you the market's shape in one view. What to read from it:
- Is movement broad or concentrated? Broad green across most industries is a market move. One industry green against a flat market is a sector event.
- Which industries are at the extremes? Both ends are interesting for different reasons.
- Is there a pattern that makes sense? Related industries moving together usually indicates a real theme. Unrelated industries moving together is often coincidence.
The heatmap will not tell you what to buy. It tells you where to point the screener, which is a considerably more useful starting point than pointing it at everything.
Then go bottom-up
With a sector or a condition in mind, move to the screener.
PocketX organises screening around a segment — the class of instrument — and a screen, the view applied within it. Choosing the universe and choosing the lens are separate decisions, and keeping them separate prevents the most common screening error: applying a momentum lens to a universe full of names it was never meant for.
Before touching a filter, answer one question: what will I do with the names that come out? A shortlist for a week-long trade needs different criteria from a shortlist for a two-year hold. Without that decision, no filter is the right one, and you will rebuild the screen every time you look at it.
The liquidity filter is not optional
Whatever else you screen on, screen on liquidity.
This matters most on any screen sorted by percentage change. Sorting the whole market by "biggest mover today" is an efficient way to surface exactly the names you should not trade — thin counters where a small order produced a large percentage move, and where the same thinness will greet you on the way out.
The move you are looking at may not have been available at any size. That is the trap, and it is invisible unless you check depth.
Reading a gainers screen honestly
A gainers screen describes what has already happened. It is not a prediction.
That does not make it useless — it makes it a starting point requiring a second question: why? A stock up eight per cent is up for a reason: results, an order win, a sector move, an index inclusion, or nothing but thin volume. Those are five different situations with five different forward implications, and the screen cannot distinguish between them.
Checking the news and the instrument's own page tells you which one you are in. Skipping that step is how people buy the top of a one-day pop.
Cross-check between the two views
This is the step that makes the pair worth more than either alone.
You have a name from the screener. Go back to the heatmap and ask: is this a stock story or a sector story?
- Stock up four per cent, sector up three and a half. This is a sector story. Your thesis is about the sector, and if you already own something else in it, you are adding to one bet.
- Stock up four per cent, sector flat. Something company-specific happened. That is a genuine lead worth researching.
- Stock flat, sector up four per cent. Interesting for the opposite reason — why did this one not participate?
That third case is frequently the most productive and the least examined.
Do not stack filters until nothing survives
A predictable failure mode: keep adding criteria until the screen returns two names, then conclude those two must be exceptional.
They are not. They are the residue of an arbitrary intersection. A screen returning two results is over-specified; one returning four hundred is under-specified. Somewhere between fifteen and forty is where a screen is doing useful work — small enough to review, large enough that you are not deceiving yourself about selection.
If your screen returns too few, loosen the criterion you are least confident about, not the one that is easiest to change. Those are rarely the same criterion.
What happens to the shortlist
The screen is the beginning of the work. For each name worth keeping, run the evidence checklist in research a stock before you act: identity, current reading, fundamentals, news, sector, tradeability, then thesis and exit.
Expect most to fail. A shortlist of thirty that produces three or four genuine candidates is a normal and healthy outcome.
Survivors go to a watchlist rather than into an order. A name that surfaced on a screen today is a name that already moved today, and buying it the same afternoon is usually paying for someone else's information.
A workable weekly routine
- Once a week, open the heatmap and note where movement is concentrated. Do not act.
- Point the screener at the areas that looked interesting, with liquidity as a fixed filter.
- Build a list of fifteen to forty, then research five properly.
- Watchlist the survivors and let them come to your price.
Two views, one direction of travel: top-down for structure, bottom-up for names, then back to the top to check whether the name was ever the story. Used together they answer the question. Used separately they each answer half of it, which is why so many screens produce lists that go nowhere.