Owning several funds does not guarantee diversification. Learn to calculate overlapping exposure and connect your investment mix to your goals.
June 10, 2024 · Financial Forte Staff
Historical article: prepared retrospectively using information available as of June 10, 2024.
Three funds can look like three different investments until you examine what they own. A growth fund, a technology fund and a broad stock fund may all hold substantial positions in the same large companies. Different names and separate statements do not necessarily mean your money is exposed to different risks.
Diversification starts with the underlying investments and the role each plays in your plan. The useful question is whether you have spread your exposure across different sources of risk, in proportions that fit when you need the money. It is possible to own many funds and still depend heavily on one part of the market.[1]
Look through the label to the holdings
A fund is a container for investments. Its name gives you a starting point, but its holdings, investment objective and restrictions tell you more. Two funds with different managers may pursue similar strategies and own many of the same securities. One broad fund may already provide exposure to hundreds of companies.
Review the percentage of the portfolio represented by major asset classes, sectors, countries and individual issuers. Include accounts held elsewhere when they serve the same household goal. A concentrated stock position does not disappear because it sits in a different brokerage account from your retirement funds.
Employer stock deserves attention alongside your employment income. A serious setback at the company could affect both the shares and your job. That does not automatically determine what to sell, particularly when taxes or restrictions apply, but it identifies a connection that an account-by-account review might miss.
Calculate the overlap before adding another fund
Take a simplified hypothetical portfolio worth $100,000. Morgan holds $40,000 in Fund A, $30,000 in Fund B and $30,000 in Fund C. Morgan assumes three different fund names provide a balanced mix. The holdings need to be examined before drawing that conclusion.
Suppose Company X represents 10% of Fund A, 15% of Fund B and 5% of Fund C. Morgan's indirect exposure to that company is $4,000, $4,500 and $1,500, respectively. Together that is $10,000, or 10% of the entire portfolio. These are invented holdings, not a description of any actual fund.
Adding a fourth fund that also holds Company X may increase that exposure instead of reducing it. The result depends on what is sold to fund the purchase and the new fund's holdings. Counting four fund names would not answer the concentration question.
Now imagine Company X declines 40% while everything else is unchanged. The direct effect of that assumed movement on Morgan's $10,000 exposure is a $4,000 loss, or 4% of the starting portfolio. This isolates one risk for explanation; real securities can move together, so an actual market decline could affect other holdings too.
Morgan can use this calculation to decide whether the concentration is intentional and affordable. It does not establish an ideal maximum holding for every investor. If Company X were instead a deliberate 5% position, the same isolated 40% decline would cost 2% of the starting portfolio. That comparison shows the effect of position size without forecasting a loss. The next step is to compare the exposure with Morgan's goals, other assets and ability to absorb a loss, then evaluate any transition costs before trading.
Understand what diversification can and cannot do
Investments can respond differently to changes in business conditions, interest rates and other influences. Spreading exposure can reduce reliance on a single company or narrow market segment. It cannot guarantee a profit or prevent losses when markets decline.[1]
Correlation describes how investment returns move in relation to one another over a measured period. It is a description of observed relationships, not a promise about the next difficult market. Assets that have behaved differently can still fall at the same time. Avoid building a plan that works only if one investment always rises whenever another falls.
Stocks and bonds also contain different risks within their own categories. A collection of long-term bonds from similar issuers is not interchangeable with a broad mix of bonds simply because both are labeled fixed income. Credit quality means the issuer’s ability to repay; maturity is the time until principal is due. Those factors and sensitivity to interest rates matter when deciding what the allocation actually does.
More variety is not always better. A complex collection can add costs, make the portfolio harder to understand and create duplication. The purpose is a useful mix, not the largest possible number of holdings. Simplicity can help when it makes the overall exposure easier to monitor.
Connect the mix to the money's purpose
Even a broadly diversified stock portfolio can be unsuitable for money needed soon. Diversification and time horizon answer different questions: how risks are spread, and how much fluctuation you can tolerate before the money must be used. Review both before deciding that a portfolio is ready for a near-term expense.[1]
If Morgan needs $15,000 for a known expense next year, that need deserves separate attention from long-term retirement growth. Moving some money toward a more appropriate short-term holding may change the overall allocation. It should be evaluated as a planning decision, including taxes and costs, rather than a forecast about next month's market.
Start by obtaining the holdings and asset mix for each account that serves the same goal. Add up overlapping exposures, identify the concentration you actually intend to keep and ask what role each fund fulfills. The result may be fewer holdings, a different mix or no change at all. What matters is that the portfolio's risks are understood and fit the job you need the money to do.
Related reading
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Educational information, not personalized investment, tax, legal or benefits advice. Examples use hypothetical assumptions. Verify current rules and your circumstances before acting.
