The Disposition Effect: Why You Sell Winners Too Early and Hold Losers Too Long (And How XEQT Fixes It)

I still remember the exact moment I realized my brain was working against me as an investor.

It was late 2019, and I was sitting at my desk staring at two positions in my portfolio. One was a Canadian tech stock I’d bought at $14 that had climbed to $22 — a tidy 57% gain in about eight months. The other was an energy company I’d picked up at $31 that had slid to $19. Down nearly 40%.

So what did I do? I sold the tech stock. Locked in that sweet $8 per share profit, felt like a genius, and treated myself to a nice dinner. I’m good at this, I thought.

The energy stock? I held it. “It’s just a rough patch,” I told myself. “Energy always comes back. I’ll wait for the recovery.”

Here’s what happened next: that tech stock kept climbing. Within 18 months it was trading above $45. I’d left more than 100% of additional gains on the table. And the energy company? It continued its slow bleed, eventually settling around $11. I finally sold it two years later at a devastating loss.

I didn’t know it at the time, but I had just experienced one of the most well-documented and destructive behavioral biases in all of investing: the disposition effect.

And if you’ve ever picked individual stocks, there’s a very good chance you’ve done the exact same thing.

1. What Is the Disposition Effect?

The disposition effect is the tendency for investors to sell assets that have increased in value (winners) while holding on to assets that have decreased in value (losers). It was formally identified by behavioral finance researchers Hersh Shefrin and Meir Statman in their landmark 1985 paper, “The Disposition to Sell Winners Too Early and Ride Losers Too Long.”

In plain language: when you have a stock that’s gone up, your brain screams “Take the money and run!” And when you have a stock that’s gone down, your brain whispers “Just hold on a little longer… it’ll come back.”

This isn’t a fringe observation. It’s one of the most replicated findings in behavioral finance. Study after study — across different countries, different time periods, different types of investors — has confirmed that the vast majority of retail investors do this. Not sometimes. Consistently.

And it is absolutely devastating to long-term returns.

The irony is almost painful: we systematically do the exact opposite of what would make us money. We cut our flowers and water our weeds. We keep a portfolio of losers and a memory book of gains we took too early.

If you’re nodding along right now, don’t worry — you’re not alone, and you’re not broken. This is literally how human psychology works. But understanding it is the first step to beating it.

2. Why We Do This: The Psychology Behind the Disposition Effect

The disposition effect isn’t random. It’s driven by several deeply rooted psychological mechanisms that have been extensively studied. Let’s break down the main culprits.

Loss Aversion: Losses Hurt Twice as Much

Nobel Prize-winning researchers Daniel Kahneman and Amos Tversky demonstrated through their groundbreaking Prospect Theory (1979) that losses are psychologically about twice as painful as equivalent gains are pleasurable.

Think about it: finding $100 on the sidewalk feels great. But losing $100 from your wallet? That stings way more than the $100 found felt good. It’s not rational, but it’s profoundly human.

When applied to investing, this means:

• Selling a losing stock makes the loss “real” — and your brain desperately wants to avoid that pain
• Holding a loser keeps the loss “on paper” — which feels less painful, even though it’s economically the same
• Selling a winner feels like a guaranteed reward — your brain loves certainty, especially when gains are involved

Your brain is essentially running a cost-benefit analysis, but it’s using rigged scales. The pain side weighs double.

The Desire to Feel Like a “Winner”

There’s a deeply satisfying emotional reward that comes from selling a stock at a profit. You get to tell yourself — and maybe your friends, your partner, or that one guy at work who also trades — “I bought it at $14 and sold it at $22.”

That’s a completed narrative. You made a smart decision, it paid off, and you cashed in. Your brain files it under “evidence that I’m a good investor.”

But if you hold that winning stock and it drops back down? Now the narrative is ruined. That unrealized gain that felt so real starts evaporating, and suddenly you feel like you “lost” money you never actually had.

So your brain pushes you to sell winners early to protect the story — even if holding longer would have been the better financial decision.

Hope and Denial with Losers

On the other side, holding a losing stock is fueled by hope and denial:

• “It’ll come back” — The most dangerous four words in investing. Sometimes stocks do recover. But many don’t, and the time you spend waiting is time your capital isn’t working elsewhere.
• “I’ll sell when I break even” — This is your brain setting an arbitrary anchor (your purchase price) that has absolutely zero relevance to the stock’s future prospects.
• “The market is wrong” — Maybe. But the market being wrong about your specific stock for months or years on end is… unlikely.
• “If I sell now, I’m admitting I was wrong” — And that, for many investors, is the real issue. Selling a loser feels like a confession of poor judgment.

Mental Accounting: Each Stock Is Its Own Story

Behavioral economist Richard Thaler identified the concept of “mental accounting” — our tendency to treat money differently depending on where it comes from or what mental “bucket” we put it in.

When you own individual stocks, each position becomes its own mental account with its own profit-and-loss story. You don’t think about your portfolio as a whole. You think about each stock individually:

• “My bank stock is up 15%”
• “My cannabis stock is down 60%”
• “My tech stock is flat”

This fragmented thinking makes the disposition effect much worse. Instead of asking “Is my overall portfolio positioned well?”, you’re constantly running through individual win/loss narratives that trigger emotional reactions.

Remember this concept. It’s going to be very important when we talk about how XEQT fixes everything.

3. Real-World Examples of the Disposition Effect

This isn’t just academic theory. The disposition effect plays out in real portfolios every single day. Here are some examples that might hit close to home.

The Canadian Investor Who Sold Shopify Too Early

Picture a Canadian investor — let’s call her Sarah — who bought Shopify (SHOP) in 2017 at around $100 per share. By mid-2018, the stock had climbed to roughly $150. Sarah was thrilled. A 50% gain! Time to lock it in.

She sold, pocketed her profit, and felt great about it.

Meanwhile, she was also holding Bombardier (BBD.B), which she’d bought at around $3.50 in 2016. By 2018 it was hovering around $4, but by 2019 it had slid back below $2. She held through the decline, telling herself the turnaround was coming.

What happened? Shopify went on to peak above $2,200 during the 2021 bull run (adjusted for the 10:1 stock split). Even at today’s prices, it’s a multi-bagger from $150. Sarah left thousands of percent in gains on the table.

Bombardier? It lingered in the low single digits for years, eventually doing a share consolidation. Sarah’s “it’ll come back” thesis never played out.

This is the disposition effect in its most brutal form: selling the future winner for a quick dopamine hit, while patiently nursing the loser that was never going to recover.

Terrance Odean’s Research: Selling Winners 50% More Often

University of California professor Terrance Odean conducted one of the most famous studies on the disposition effect in his 1998 paper “Are Investors Reluctant to Realize Their Losses?”

Using data from 10,000 brokerage accounts, Odean found that:

• Investors were approximately 50% more likely to sell a winning stock than a losing stock
• The winners that were sold went on to outperform the losers that were held by an average of 3.4 percentage points over the following year
• This pattern persisted across virtually all account sizes and investor experience levels

Let that sink in: the stocks people sold (winners) continued to beat the stocks people held (losers). Investors were systematically selling their best performers and keeping their worst.

The Cost in Numbers

Here’s a simplified illustration of how the disposition effect destroys returns over time:

The exact numbers will vary, but the pattern is consistent: the disposition effect investor dramatically underperforms both the rational stock picker and the passive index investor. And unlike the “rational investor” scenario, the XEQT investor achieves solid returns without needing any discipline around individual sell decisions.

4. Why the Disposition Effect Is So Costly

The disposition effect doesn’t just feel bad — it destroys wealth through multiple channels. Here’s why it’s one of the most expensive behavioral biases you can have.

Winners Tend to Keep Winning (Momentum)

One of the most robust findings in finance is the momentum effect: stocks that have been going up tend to continue going up in the short-to-medium term (6 to 12 months), and stocks that have been going down tend to continue falling.

When you sell your winners early, you’re fighting against momentum. You’re exiting positions right when they have the statistical wind at their backs. Meanwhile, by holding your losers, you’re riding negative momentum — staying in positions that are statistically likely to continue underperforming.

It’s like leaving a party that’s just getting started and heading to one that’s already winding down.

You End Up with a Portfolio of Losers

Over time, the disposition effect has a compounding effect on your portfolio composition. Think about it:

• Every time a stock goes up significantly, you sell it
• Every time a stock goes down, you hold it
• After a few years, what’s left? A portfolio full of your worst-performing stocks

Your portfolio becomes a graveyard of broken theses and hopes deferred. All the good stuff has been sold. All the bad stuff remains. This is the exact opposite of what you want.

Tax Inefficiency: The Double Whammy

Here’s where the disposition effect gets really expensive from a Canadian tax perspective:

• Selling winners creates taxable capital gains — In a non-registered account, 50% of your capital gains are included in your taxable income. By selling winners, you’re triggering tax events constantly.
• Holding losers means you’re NOT harvesting tax losses — Capital losses can offset capital gains, reducing your tax bill. But you can only claim the loss when you actually sell. By holding your losers indefinitely, you’re sitting on tax deductions you’re not using.

So the disposition effect investor is doing the worst possible thing for taxes: realizing gains (taxable) and deferring losses (which could reduce taxes). A rational investor would do the opposite — defer gains and harvest losses.

In a TFSA or RRSP, the tax implications are sheltered. But in a taxable account, the disposition effect is literally costing you money at tax time on top of the poor returns.

Opportunity Cost: Your Capital Is Trapped

Every dollar tied up in a losing stock is a dollar that’s not working for you elsewhere. If you’re holding a stock that’s down 40% and going nowhere, that capital could be deployed in a broadly diversified fund earning market returns.

The question to ask isn’t “will this stock get back to my purchase price?” The question is: “If I had this cash today, would I buy this stock?” If the answer is no, you should sell — regardless of what you paid for it.

5. How XEQT Eliminates the Disposition Effect

Here’s where we get to the good news. If you’ve been reading this article and recognizing yourself in every example, there’s a remarkably simple solution: stop owning individual stocks and hold XEQT instead.

Here’s exactly why XEQT is the antidote to the disposition effect.

There’s Only ONE Holding — No Winners or Losers to Compare

The disposition effect requires you to have multiple positions that you can mentally rank as “winners” and “losers.” When your entire equity portfolio is a single holding — XEQT — there’s nothing to compare.

You can’t sell the “winner” and keep the “loser” because there is no winner or loser. There’s just your investment. It goes up over time, you buy more, and that’s the whole strategy.

This eliminates the mental accounting problem entirely. You’re no longer running profit-and-loss calculations on 15 different stocks. You have one number. It either went up today or it went down. And either way, your plan is the same: keep holding and keep buying.

You Never Have to Decide Which Position to Sell

One of the hardest decisions in investing is deciding what to sell and when. The disposition effect makes this decision even harder because your brain is pushing you toward the wrong choice.

With XEQT, the sell decision is binary: sell everything or sell nothing. There’s no agonizing over “should I trim my tech position?” or “should I cut my losses on this energy stock?” Those decisions simply don’t exist.

And for most XEQT investors, the answer to “should I sell?” is almost always “no” — because XEQT is a long-term hold by design. You buy it for years or decades, not for a quick trade.

XEQT’s Internal Rebalancing Does the Hard Work

Here’s something beautiful about XEQT that most people don’t appreciate: it automatically does the thing that’s psychologically hardest for individual investors.

XEQT holds four underlying iShares ETFs covering Canadian, US, international, and emerging market equities. When one region outperforms (becomes a “winner”) and another underperforms (becomes a “loser”), XEQT’s management team periodically rebalances — trimming the outperformers and adding to the underperformers.

This is essentially “sell high, buy low” executed systematically and without emotion. It’s the opposite of the disposition effect, built right into the product. And you don’t have to lift a finger or fight your own psychology to make it happen.

Simplicity Removes the Cognitive Load

The disposition effect thrives on complexity. The more individual positions you have, the more opportunities your brain has to create narratives, make comparisons, and push you toward bad decisions.

XEQT is beautifully, radically simple. One ticker. One holding. One strategy: buy regularly and hold for a long time. There’s so little to think about that there’s almost nothing for your behavioral biases to latch onto.

When you hold XEQT in a TFSA or RRSP with automatic contributions, you’ve essentially automated yourself out of the equation. And given what we know about human psychology and investing, removing yourself from the decision-making process is one of the best things you can do for your returns.

6. Practical Strategies to Fight the Disposition Effect

Maybe you’re not ready to go all-in on XEQT. Maybe you genuinely enjoy picking stocks and want to keep some individual positions. That’s okay — but you need to actively fight the disposition effect. Here’s how.

Set Sell Rules in Advance

Before you buy any stock, write down exactly when you’ll sell it — both on the upside and downside:

• Stop-loss level: “If this drops 20% from my purchase price, I’m out.” Set this the day you buy and stick to it.
• Target price or thesis: “I’m holding this until it reaches $X or until my investment thesis changes.” Not until you feel like selling — until a predetermined condition is met.
• Time-based review: “I’ll evaluate this position in 12 months. If the original thesis hasn’t played out, I sell regardless of price.”

Writing these rules down when you’re calm and rational helps you follow them when emotions are running high.

The “Fresh Eyes” Test

This is the single most powerful question you can ask yourself about any position:

“If I had cash equal to the current value of this position, would I buy this stock today at today’s price?”

If the answer is no, sell. It doesn’t matter what you paid for it. Your purchase price is irrelevant to the stock’s future prospects. The only thing that matters is whether the stock is a good investment right now.

This reframes the decision. You’re not “selling at a loss.” You’re reallocating capital from a position you wouldn’t choose today to one you would.

Focus on the Portfolio, Not Individual Positions

Train yourself to evaluate your total portfolio return, not individual stock performance. This counters the mental accounting bias that fuels the disposition effect.

Instead of thinking:

• “Stock A is up 30%, Stock B is down 25%, Stock C is flat…”

Think:

• “My total portfolio is up 6% this year. Is that on track with my goals?”

This whole-portfolio perspective makes it much easier to cut a loser (it’s just a small reallocation within a larger strategy) and hold a winner (it’s contributing to overall performance, not a gain to be “locked in”).

Consider Whether XEQT Should Replace Your Stock Picking Entirely

After you’ve honestly tracked your individual stock performance for a year or two — including the disposition effect and all its costs — compare your returns to XEQT’s returns over the same period.

For most retail investors, the answer is humbling. Study after study shows that the majority of individual stock pickers underperform broad market indices over time. Add in the disposition effect, trading costs, and the tax inefficiency of frequent selling, and the gap gets even wider.

Ask yourself honestly: is the thrill of stock picking worth the very real performance drag? For some people, it might be. But if you’re investing to build wealth and secure your financial future — not for entertainment — XEQT is likely the better choice.

7. The Ultimate Antidote: Just Hold XEQT and Stop Making Sell Decisions

Let me bring this full circle with a bit of hard-won honesty.

After my painful experience selling that tech winner too early and riding that energy loser into the ground, I started reading about behavioral finance. I read Kahneman. I read Thaler. I read Shefrin and Statman’s original paper. And I realized something uncomfortable: I wasn’t just unlucky. I was psychologically wired to make bad sell decisions.

And here’s the thing — knowing about the disposition effect doesn’t necessarily cure it. I could read every behavioral finance textbook ever written and still feel that gut-level urge to sell a winner and hold a loser. The bias is that deep.

So I stopped fighting it. I stopped trying to be a disciplined stock picker who could override his own psychology. Instead, I built a system where the disposition effect simply can’t operate.

That system is XEQT.

Here’s what my investing life looks like now:

1. Every payday, money automatically moves to my Wealthsimple account
2. I buy XEQT. That’s it. One ticker. One click (or automated through recurring buys).
3. I don’t check individual stock performance because there are no individual stocks
4. I don’t agonize over sell decisions because I’m not selling
5. I don’t feel the pull of the disposition effect because there are no winners or losers to sort through

Is it boring? Absolutely. But boring is the point. Every bit of excitement in your investing life is a potential entry point for behavioral biases. The less exciting your strategy, the less damage your psychology can do.

Here’s the honest truth about investing that took me years and thousands of dollars in mistakes to learn: the best investment strategy isn’t the one with the highest theoretical return. It’s the one you can actually stick to without your brain sabotaging you.

For me — and I suspect for most Canadian retail investors reading this — that strategy is buying XEQT consistently, holding it indefinitely, and letting time and compound growth do the heavy lifting.

The disposition effect cost me real money. Thousands of dollars I’ll never get back. If this article helps even one person avoid making the same mistakes I did, it was worth writing.

Your future self will thank you for choosing simplicity over psychology. Start with XEQT, automate your contributions, and never worry about the disposition effect again.

Key Takeaways

Here’s what to remember about the disposition effect:

• The disposition effect is the tendency to sell winning investments too early and hold losing investments too long. It was identified by Shefrin and Statman in 1985 and has been replicated in dozens of studies since.
• It’s driven by loss aversion (losses hurt 2x as much as gains feel good), the desire for completed “winner” narratives, hope/denial with losers, and mental accounting.
• It’s incredibly costly: you fight momentum, end up with a portfolio of losers, create tax inefficiency, and trap capital in underperforming positions.
• XEQT eliminates it by giving you a single holding with no individual winners or losers to compare, no sell decisions to agonize over, and built-in rebalancing that does the hard psychological work for you.
• If you do pick individual stocks, fight the bias with pre-set sell rules, the “fresh eyes” test, and a whole-portfolio perspective.
• The ultimate solution is to simplify your investing to the point where behavioral biases have nothing to work with. For most Canadian investors, that means buying and holding XEQT.

Stop fighting your psychology. Start working around it.