If you thought the most fascinating aspect of markets are the charts and repeated patterns that play out, you are wrong. Even more fascinating is a pattern that plays out across thousands of beginners decade after decade, in bull and bear markets, across every asset class from cash equities to weekly options! One trading mistake leading to another sets in motion a near-perpetual cycle of losses, gains and losses again.

None of this requires one to be careless, or foolish by nature. It only requires that you treat markets the same way you approach other things in life — because every one of these mistakes is, in its own way, a perfectly normal human response to an environment that punishes normal human responses more severely than almost anything else in ordinary life. An aspect that a recent SEBI study on trading behaviour of individual traders in equity derivative segment reveals — nine out of 10 individual traders continuing to lose money in FY26, as was the case earlier too!

So, if you want to spare yourself that pain, here are five costly mistakes you need to avoid in markets at any cost.

The 9:15 reflex

The first 15 minutes after the open are the most dangerous quarter-hour in any trading day — not because anything sinister is happening, but because of simple market mechanics. Overnight orders that built up while the exchange was closed are still being resolved. Institutional desks, who have been preparing all night for precisely this window, are actively repositioning large books based on overnight global cues, and their order flow can whip a stock’s price around in ways that have nothing to do with that company’s fundamentals. A new trader who enters at 9:15 is, in effect, walking into a room where everyone else has already been briefed, and mistaking the noise for a signal.

There’s a reason experienced desks talk about the “opening range” — the high and low of the first 15-30 minutes — as something to observe, not trade.

Waiting isn’t passivity. It’s the cheapest piece of risk management a beginner will ever get, and it costs nothing but a little patience. Watch the first 15 minutes instead of trading them, and the picture is almost always clearer by 9:30 than it was at 9:15.

Overconfidence after the first win

A little luck early on is almost worse than an early loss, because it teaches the wrong lesson at exactly the moment a new trader is most impressionable. Two or three profitable trades in a row — which, in a market that moves up more often than it falls, is not a rare event even for someone choosing stocks at random — and a new trader’s position size starts creeping upward. Not because the analysis improved. Not because a repeatable edge was discovered and tested, but simply because the confidence did.

This is overconfidence bias in its purest form: mistaking a short run of favourable outcomes, in a fundamentally noisy environment, for a skill that actually takes years and hundreds of trades to build and verify. Three winning trades tell you almost nothing statistically. They tell your nervous system a great deal, which is precisely the problem.

A useful disciplinet, is to keep size mechanically identical for a fixed number of trades — 20, 50, whatever a beginner can commit to — regardless of how the previous ones went, purely so that confidence earned through actual data eventually replaces confidence borrowed from a lucky week.

Loss aversion, revenge trading

Nobody is prepared for how a loss feels the first time it’s real money and not a demo account. Loss aversion is the well-documented tendency to feel a loss roughly twice as intensely as an equivalent gain, which is exactly why so many beginners hold a losing position far longer than their own plan allowed, hoping it turns around before they have to accept it was wrong. The pain of realising a loss is disproportionate to the loss itself, so the mind reaches for any reason to postpone realising it: it’ll come back, I’ll just wait for breakeven, the fundamentals haven’t changed. Far more often, they are loss aversion wearing the costume of analysis.

The plan you made while calm is the only version of you qualified to set that exit. The version of you staring at a red number in real time is not, because that version of you is negotiating with pain, not analysing a market.

If loss aversion is what keeps a beginner in a losing trade too long, revenge trading is what happens in the minutes after they finally, painfully, get out of one. It is, without much competition, the single-most destructive habit on this list, because it doesn’t just repeat a mistake — it compounds it.

Revenge trading looks, from the outside, like a trader doubling down: a bigger position, taken faster, with less analysis, immediately after a loss, in the same stock or a completely different one. The trade isn’t really about the new setup in front of you.

Beginners are especially vulnerable here for a simple reason — they haven’t yet built the emotional callus that comes from having survived many losses before, so each one still feels like a referendum on whether they belong in the market at all, and revenge trading is the mind’s fastest available answer to that anxious question.

The single most effective rule against it is almost embarrassingly simple, and precisely because it removes the decision from the moment it’s most likely to be made badly: after any loss beyond a size decided in advance, stop trading for the rest of that session. Stop, fully, until the next session, when the version of you who wasn’t just stung by a loss gets to make the next decision instead.

Mental accounting with money that really isn’t yours

Money doesn’t come with a label, but our minds insist on giving it one anyway. This is mental accounting — treating a rupee differently depending on where it came from or what it’s sitting next to — and it shows up in more places than most beginners expect. It shows up when profits sitting in the account, gets risked more casually than the original capital, as though a rupee earned from a win is somehow less real than a rupee that came from a salary. It shows up when a year-end bonus gets treated as disposable in a way regular income never would be. And it shows up most dangerously when the source of trading capital is a personal loan, a credit card, or money borrowed specifically to trade, because borrowed capital carries a cost whether the trade wins or loses.

If the capital has an interest bill attached to it regardless of outcome, that changes the arithmetic of every trade placed with it — and most new traders never run that arithmetic at all, because the money already feels spent the moment it lands in a trading account, rather than treated as the same rupee it always was.

Recency bias

A new trader’s conviction often has a shelf life of about one Telegram message. A tip arrives, and positions get adjusted to match, not because anything material changed about the company or the chart, but because the most recent thing heard feels like the most important thing known. This is recency bias: treating the latest piece of information as disproportionately significant simply because it’s the freshest.

What the disciplined ones do differently

New traders still trading confidently five years later tend to share very little in terms of strategy — some are chart-based, some fundamentals-based, some barely look at a chart at all, preferring to build positions slowly around businesses they’ve researched for months. What they share, almost without exception, is process, and process turns out to matter far more than the specific edge any individual trader claims to have found.

They wait for the market to settle before acting. They size a position the same way after a win as after a loss. They write down the exit — both the level they’ll accept as wrong and the level at which they’ll take profit — before they place the entry, not after. They trade only money whose loss changes nothing essential about their lives, which is a much smaller sum, for almost everyone, than it initially feels like it should be. And they give the last thing they heard exactly as much weight as it deserves, which is usually very little.

Perhaps most importantly, they have a rule for what happens immediately after a loss — a specific, mechanical rule, decided in advance, that takes the decision out of the hands of whichever version of them is currently upset. That single habit, more than any other on this list, is usually the difference between someone who survives their first 18 months and someone who doesn’t.

The author is an AMFI & APMI-registered MF/SIF/PMS distributor, private investor and educator

Published on August 22, 2026