Your portfolio called. It's tired of all its exes.

Let’s get personal. When was the last time you dumped a loser? No, I don’t mean your ex. I mean that deadbeat in your portfolio still lurking like those Kingfisher Airlines shares some people held onto, convinced they'd bounce back, even as the airline headed to its final landing.

Why is it still there? Guilt? Hope? Habit? Maybe you’re still romanticising that stock since it made you feel like Warren Buffett on a random Tuesday in 2021. But this reluctance to let go, more often than not, stems from emotion rather than fact or fundamentals.

Why does this happen? The answer lies not in market trends or balance sheets but in behavioural finance. Our portfolios, ideally structured around logic and long-term goals, also carry emotional weight. And just like clutter in our homes, emotional baggage in our investments can cloud judgment and drag down performance.

In this article, I explore the psychological biases like the Disposition Effect, loss aversion and the sunk cost fallacy that prevent investors from making clear-eyed decisions and tell you how to steer clear of them to build a cleaner, more purposeful portfolio.

Rational markets, emotional investors

Classical economic theory assumes that individuals act rationally by processing available information to maximise expected outcomes. Financial markets, under this lens, are expected to reflect such rationality through efficient pricing. But anyone who’s ever opened their Demat account after a market dip knows that’s far from reality.

We should now listen to behavioural finance, the more psychologically savvy cousin of classical economics. It emerged precisely to explain this gap between theory and reality. Investor behaviour is often shaped not by logic or information, but by cognitive biases, emotional attachments and psychological heuristics.

One of the most notorious of these biases is the Disposition Effect. It is the systematic tendency to sell appreciating assets too soon while retaining depreciating ones for far too long. This reveals a sense of psychological discomfort with acknowledging financial error and an eagerness to lock in success prematurely.

In this respect, a profitable stock may come to represent a kind of symbolic capital—a “trophy asset,” if you will. The losing investment, by contrast, acquires the emotional baggage of regret, sometimes even denial, much like a relationship that one maintains not out of conviction, but out of a misplaced hope for eventual redemption. (That ex you keep stalking on Instagram, convinced they’ll “come around.”)

The psychology behind the bias

As Daniel Kahneman and Amos Tversky’s prospect theory demonstrated, human beings are not wired to treat gains and losses symmetrically. The psychological pain of losing Rs 100 consistently outweighs the pleasure derived from gaining the same amount—a phenomenon known as loss aversion. In other words, losses loom larger than gains and this asymmetry has profound consequences for investor behaviour.

Now layer on mental accounting, another cognitive quirk, and the plot thickens. Rather than viewing a portfolio as an integrated whole, investors tend to evaluate each position in isolation.

Like episodes in a sprawling family saga, we end up treating each stock like a separate character: your star performer (that reliable large-cap), the struggling one you're rooting for (a shaky small-cap biotech) and the doomed fling you’d rather forget (that one IPO disaster).

This habit of splitting your portfolio into emotional silos distorts how you see risk and return. Instead of making decisions based on logic or long-term goals, you're now reacting to guilt, misplaced loyalty, or the hope of a turnaround story.

The sunk cost fallacy is another major culprit. The reason we continue to invest in underperforming assets is not because they show promise, but because we have already sunk too much money into them. But what you need to remember is that money lost is just that—lost. Moving on is the right thing to do.

Ask yourself: If I were to invest in this stock today, given everything I know now, would I still go ahead? If the answer is no, then it’s time to sell. Holding on for “closure” may work in rom-coms, but in the markets, it’s a fast track to financial disappointment.

What you can do

Fortunately, behavioural biases, while deep-rooted, are not immutable. With thoughtful planning and consistent discipline, they can be managed, even if they cannot be completely removed. One such tool is the quarterly exit audit: a structured review of the portfolio aimed at detaching emotional baggage from investment decisions.

Here’s how:

• Evaluate every position. Without looking at purchase prices, ask: Would I buy this asset today?
• For losing positions, assess whether the underlying fundamentals remain intact. If not, exit.
• For winning positions, identify whether selling is motivated by a coherent strategy or a desire to “book profits” and feel temporarily clever.

Value Research Online offers tools like the Fund Monitor and Stock Screener that can be used to spot underperforming funds or stocks based on relative benchmarks and risk-adjusted metrics, reducing the emotional burden of decision-making. The goal is not to eliminate emotion, which is an impossible task, but to design a system where emotion plays a subordinate role to strategy.

Letting go of the emotional baggage

Investment decisions are as much reflections of emotional memory as they are of financial judgement. The hallmark of a mature investor is not emotional absence. But having an emotional awareness.

True mastery lies in acknowledging bias, containing its effects, thereby enabling clear, deliberate action. And in case nobody told you: knowing when to let go is the hottest thing you can do with your money this year.

Also read: How one Mysuru family brought their finances together

This article was originally published on June 11, 2025.