Diversification: Look Inside Your Investments
By Beacon · Updated · 3 min read
Diversification spreads investment exposure so one company, industry, or type of asset does not determine the entire result. It can reduce concentration risk, but it cannot eliminate losses. What matters is the underlying mix, not simply how many funds or accounts you own.
Look at two levels of diversification
Asset allocation is the division among broad categories such as stocks, bonds, and cash. Diversification also operates within a category: stock holdings may differ by company, industry, or country, while bond holdings may differ by issuer and other characteristics.
A portfolio can be broad at one level and narrow at another. Owning shares in many companies from a single industry spreads company-specific exposure but leaves the portfolio sensitive to that industry.
Check whether different funds own the same things
Suppose you divide $10,000 equally between two hypothetical funds. Fund A holds 8% in Company X, while Fund B holds 20% in that company. Your combined exposure is $400 plus $1,000, or $1,400.
That is 14% of the portfolio in one company, even though you bought two funds. Adding a third fund with similar holdings could increase the concentration. The fund names alone would not reveal it.
| Holding | Amount invested | Company X weight | Your exposure |
|---|---|---|---|
| Fund A | $5,000 | 8% | $400 |
| Fund B | $5,000 | 20% | $1,000 |
| Combined | $10,000 | 14% | $1,400 |
Understand what diversification cannot do
Different investments can fall together. A broad market decline may affect a diversified portfolio, and bonds have their own risks. Spreading exposure does not turn investments into guaranteed savings.
Think about when the money must be available. A portfolio intended for spending next year faces a different practical problem from one intended for a distant retirement. If you must sell during a decline, the ability to wait for a recovery may be limited.
Sources: Investor.gov: Diversification
Review the mix after it changes
Markets and new contributions can change your percentages. In an illustrative $10,000 portfolio split $6,000 stocks and $4,000 bonds, a rise in stocks to $7,000 with bonds unchanged produces roughly 64% stocks. You did not buy more stock, but the mix moved.
Rebalancing means adjusting toward a chosen allocation. Before trading, consider taxes, transaction costs, and whether contributions could make part of the adjustment. A clear reason for the target is more useful than reacting to every price movement.
- List the underlying assets and largest holdings.
- Check overlap across all accounts.
- Connect the mix to the goal and spending date.
- Review changes using a consistent schedule or rule.
Terms in this guide
Sources and further reading
Examples are illustrative and focus on U.S. personal finance. This guide is educational, not individual financial, investment, tax, or legal advice. Read our editorial approach or report a correction.
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