Is Your Portfolio More Concentrated Than You Think?
Owning multiple investment funds doesn't necessarily mean you're diversified.
Many investors understand the importance of diversification. The idea is relatively simple: spreading your investments across different companies, industries, and asset classes can help reduce the risk associated with any single investment.
But what happens when the investments you own aren't as different as you think?
It's entirely possible to own several mutual funds or exchange-traded funds (ETFs) and still have a significant portion of your portfolio invested in the same handful of companies. This can create unintended concentration and expose investors to more risk than they realize.
With the increasing influence of large technology companies on the broader stock market, understanding what's actually inside your investment portfolio has become particularly important.
More Funds Doesn't Always Mean More Diversification
One of the most common misconceptions about diversification is that owning more funds automatically means having a more diversified portfolio.
Consider an investor with the following hypothetical allocation:
- 50% in an S&P 500 index fund
- 30% in a large-cap growth fund
- 20% in a technology sector ETF
At first glance, this investor owns three different funds, each with its own investment strategy.
However, a closer look at their underlying holdings may reveal significant overlap. Companies such as Nvidia, Microsoft, and Apple can represent substantial positions across all three types of funds.
As a result, the investor may have considerably more exposure to these companies than intended.
To illustrate, suppose one company represents 8% of the S&P 500 fund, 12% of the growth fund, and 18% of the technology ETF. Based on the allocations above, that single company would represent 11.2% of the investor's entire portfolio.
The important takeaway is that diversification isn't simply about the number of funds you own. It's about understanding the investments inside those funds and how they contribute to your overall portfolio.
This is one of the risks we discuss in our article, The Hidden Costs of DIY Investing.
Why Portfolio Concentration Matters in Today's Market
Over the past several years, a relatively small group of large companies has become increasingly influential in determining the performance of major U.S. stock market indexes.
The S&P 500, for example, is a market-capitalization-weighted index. This means that larger companies generally have a greater influence on the index's performance than smaller companies.
According to S&P Dow Jones Indices, the ten largest constituents of the S&P 500 accounted for approximately 39.1% of the index.
In other words, more than one-third of an investment tracking the S&P 500 was concentrated in just ten index constituents.
This concentration is not necessarily a reason to avoid index investing. Broad-market index funds remain a useful investment option for many investors, offering low costs and exposure to hundreds of companies.
However, it highlights an important distinction: owning a fund that tracks hundreds of companies doesn't mean each company has an equal impact on performance.
The growing investor enthusiasm surrounding artificial intelligence has also drawn attention to many of the largest technology-related businesses. Investors who own broad-market indexes alongside technology or growth-oriented funds may be increasing their exposure to some of these same companies without realizing it.
If those companies perform well, that concentration can benefit portfolio returns. But the opposite is also true. A significant decline among a relatively small group of heavily weighted companies could have an outsized impact on an investor's portfolio.
Concentration Risk Extends Beyond Technology Stocks
While large technology companies have received considerable attention, portfolio concentration can develop in several other ways.
An investor might have substantial exposure to a single industry through individual stocks, sector-specific funds, or employer-sponsored stock compensation.
For example, someone who works for a publicly traded company may receive stock options or other equity compensation as part of their employment. If that individual also owns company stock in a brokerage account or retirement plan, a meaningful portion of their overall wealth could become tied to the financial success of one business.
This creates an additional consideration: a decline in the company's financial condition could potentially affect both the value of the individual's investments and their employment income.
For executives and employees receiving equity compensation, understanding the potential risks and tax implications of concentrated stock positions is particularly important. We explore some of these considerations in our article on Employee Stock Options and Financial Planning.
Concentration can also occur when investors maintain multiple accounts without considering their combined allocations. A 401(k), IRA, and taxable brokerage account might each appear reasonably diversified when reviewed separately, while the combined portfolio tells a different story.
How Can You Tell If Your Portfolio Is Overconcentrated?
Identifying potential concentration doesn't necessarily require a complicated investment analysis, but it does require looking beyond the names of the funds you own.
Here are several questions worth considering:
1. What are the largest holdings in your portfolio?
Review the underlying investments in your mutual funds and ETFs. Pay particular attention to the companies that appear repeatedly among their largest holdings.
2. How much exposure do you have to individual sectors?
Even if your portfolio is spread across multiple funds, you could have significant exposure to technology, financial services, healthcare, or another particular industry.
3. Are you considering all your investment accounts together?
Your overall allocation should account for investments held across retirement accounts, taxable accounts, and other significant investment holdings.
4. Has market performance changed your original allocation?
If certain investments have performed exceptionally well, they may now represent a much larger percentage of your portfolio than originally intended.
5. Does your current level of risk align with your financial goals?
The appropriate amount of concentration will vary depending on your time horizon, financial circumstances, investment objectives, and willingness to accept volatility.
Ultimately, identifying concentration is only the first step. Determining whether that concentration is appropriate requires understanding the role each investment plays in your broader financial plan.
Should You Make Changes to Your Portfolio?
Discovering that your portfolio is more concentrated than expected doesn't necessarily mean you should immediately sell investments.
In fact, making significant investment changes based solely on recent market performance or predictions about which companies will outperform can create additional risks.
Instead, investors should consider whether their existing allocation remains consistent with their long-term objectives.
Periodic portfolio rebalancing can help address situations where certain investments have grown to represent a larger portion of a portfolio than originally intended. However, rebalancing should be approached thoughtfully, particularly in taxable accounts where selling appreciated investments could trigger capital gains taxes.
As we discuss in Playing the Long Game: Building Wealth Strategically Over Time, maintaining a disciplined investment approach can be just as important as selecting investments in the first place.
Diversification cannot eliminate investment risk or guarantee against losses, but it can help investors manage their exposure to individual companies, industries, and other sources of portfolio risk.
Understanding What You Own
A well-diversified portfolio doesn't necessarily need to be complicated. In many cases, simplicity can be an advantage.
What matters most is understanding what you own, how your investments work together, and whether your overall allocation remains appropriate for your financial situation.
At WebsterRogers Financial Advisors, we believe investment decisions should be guided by a disciplined, long-term approach rather than short-term market trends. Evaluating portfolio diversification and monitoring asset allocation are important parts of that process.
If you haven't reviewed the underlying holdings in your investment accounts recently, it may be worth taking a closer look. You might be surprised by how much exposure you have to a relatively small number of companies.
To learn more about our approach, visit our Investment Management page or contact a member of our team.
Disclosure: The information provided in this blog post is for educational and informational purposes only and should not be construed as financial advice. While we strive to present accurate and up-to-date information, the financial, tax, and legal landscape is subject to change, and individual circumstances vary. Readers are encouraged to consult with a qualified financial advisor or professional before making any financial decisions or implementing strategies discussed in this post. Our firm does not guarantee the accuracy, completeness, or suitability of the information provided, and we disclaim any liability for any direct or indirect damages arising from the use of this information. Artificial Intelligence was used to assist in the writing of this article. Past performance is not indicative of future results. Any investment involves risk, and individuals should carefully consider their financial situation and risk tolerance before making any investment decisions.