The Most Dangerous Factor In Investing Isn’t Volatility; It’s The Last 12 Months
Nathaniel J. Tilton, CFP, AIF, Managing Principal and Wealth Advisor, Tilton Wealth Management.
When investors evaluate their portfolios, there’s one factor that consistently carries more weight than it should, and that is recent performance. Whether it’s a strong 12-month return or a disappointing quarter, investors tend to anchor their decisions to what just happened. And while that instinct is human, it’s also one of the most destructive forces in long-term investing.
In my experience working with clients over the past 25 years, the biggest threat to a well-constructed portfolio isn’t market volatility itself. Rather, it’s the tendency to overreact to recent results.
The Recency Trap
We all know that the capital markets don’t move in straight lines, and performance is rarely evenly distributed over time. A portfolio that performs exceptionally well over the past 12 months may have benefited from a narrow set of conditions—perhaps a concentrated position in a specific sector, a surge in a handful of stocks or a temporary macroeconomic tailwind. Those conditions, whether positive or negative, are not guaranteed to persist. Yet investors often assume they will.
This is what behavioral economists refer to as “recency bias,” our tendency to overweight recent information when making decisions. In investing, it shows up when we chase what’s working now and abandon what hasn’t worked lately. Ironically, this behavior often leads investors to buy high and sell low. The exact opposite of what most every investor intends to do.
When ‘Good Performance’ Becomes A Risk
Strong recent returns feel reassuring. They create a sense of confidence, maybe even validation. But in many cases, they should prompt deeper scrutiny rather than blind trust. Why? Because outsized returns are often accompanied by increased concentration and elevated risk.
A retirement account that has significantly outperformed over the past year may be heavily tilted toward a specific asset class, sector or style. That concentration may not be obvious at first glance, but it can introduce vulnerabilities that only become apparent when market conditions subsequently shift. What looks like strength today may be fragility in disguise. Of course, this doesn’t mean that strong performance is inherently bad. It just needs to be understood in context.
The Difference Between Outcome And Process
One of the most important distinctions investors can make is the difference between outcome and process. The outcome is what happened, which is your return over a given period. The process is how you got there, which examines the level of diversification, the risk taken and whether the strategy aligns with long-term goals. A good outcome doesn’t always reflect a sound process. And a sound process won’t always produce good short-term outcomes.
The problem is that most investors evaluate their portfolios based almost entirely on outcomes, especially recent ones. This is where disciplined investing becomes difficult. It requires the ability to look past short-term results and assess whether the underlying strategy still makes sense.
A Better Way To Evaluate Your Portfolio
Instead of focusing on what your portfolio did over the last 12 months, consider whether your allocation aligns with your long-term goals and time horizon. Are you properly diversified or overly dependent on a narrow set of investments? How would this portfolio behave in a different market environment? If recent winners underperform going forward, would you still be comfortable with your strategy?
This shifts the focus from your performance to your purpose, which is a critical factor in successful investing. Don’t think of your portfolio as a report card. It’s a tool designed to help you achieve specific financial outcomes. The investment portfolio is just a commodity to help you achieve your goals. Judging it solely on recent performance is like evaluating a long-term plan based on a single chapter.
The Role Of Discipline
None of this is easy, which is why financial advisors play the important role of financial therapist. In my opinion, behavioral finance is far more important than selecting the best performing large-cap mutual fund. It’s natural to feel uneasy when something you own is underperforming or to feel tempted to double down on what’s working. But successful investing often requires doing the opposite of what feels comfortable in the moment. That might mean rebalancing away from recent winners or staying invested in areas that haven’t performed well. These decisions don’t always feel right, but they are often necessary to maintain a disciplined, long-term approach.
Final Thoughts
Markets will continue to fluctuate, and performance is certain to ebb and flow. There will always be a temptation to judge your portfolio based on what just happened. But when recent performance becomes the primary driver of decision-making, even the best laid plans can quickly come undone.
The investors who succeed over time aren’t the ones chasing what has worked or running from what has not. They’re the ones who stay focused on the process, which should lead to greater investment success.
The information provided here is not investment, tax or financial advice. You should consult with a licensed professional for advice concerning your specific situation.
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