Portfolio Diversification: What It Is and Why It’s Important

Portfolio diversification involves investing your money across a range of different asset classes — such as stocks, bonds, and real estate — rather than concentrating all of it in one class. The logic is that by diversifying the assets in your portfolio, you may offset a certain amount of investment risk, and thereby, hopefully, improve returns.

Taking portfolio diversification to the next step — further differentiating the investments you have within asset classes (for example, holding small-, medium-, and large-cap stocks, or a variety of bonds) — may also be beneficial.

Building a diversified portfolio is only one of many financial tools that can help mitigate investment risk and improve performance. But there is a lot of research behind this strategy, so it’s a good idea to understand how it works and how it might benefit your financial plan.

What Is Portfolio Diversification?

Portfolio diversification refers to spreading a portfolio’s investments across asset classes, industries, sectors, geographies, and more, in an effort to reduce investment risk, as noted.

When you invest in stocks and other securities, you may be tempted to invest your money in a handful of sectors or companies where you feel comfortable. You might justify this approach because you’ve done your due diligence, and you feel confident about those sectors or companies. But rather than protecting your money, limiting your portfolio like this could make you more vulnerable to losses.

To understand this important aspect of portfolio management, it helps to know about the two main types of risk: Systemic risk, and unsystematic risk.

•   Systematic risk, or market risk, is caused by widespread events like inflation, geopolitical instability, interest rate changes, or even public health crises. You can’t manage systematic risk through diversification, though; it’s part of the investing landscape.

•   Unsystematic risk is unique or idiosyncratic to a particular company, industry, or place. Let’s say, for example, a CEO is implicated in a corruption scandal, sending their company’s stock plummeting; or extreme weather threatens a particular crop, putting a drag on prices in that sector. This is what may be referred to as unsystematic risk.

While investors may not be able to do much about systematic risk, portfolio diversification may help mitigate unsystematic risk. That’s because even if one investment is hit by a certain negative event, another holding could remain relatively stable. So while you might see a dip in part of your portfolio, other sectors can act as ballast to keep returns steady.

This is why diversification matters.

You can’t protect against the possibility of loss completely — after all, risk is inherent in investing. But building a portfolio that’s well diversified helps reduce your risk exposure because your money is distributed across areas that aren’t likely to react in the same way to the same occurrence.

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What Should a Diversified Portfolio Look Like?

A fairly basic example of a relatively diversified portfolio may concern the 60-40 rule, which is a basic rule-of-thumb for asset allocation: You invest 60% of your portfolio in equities and 40% in fixed income and cash.

But that’s just one example. A portfolio can contain a broader mix of assets that includes stocks, bonds, alternative assets, real estate, and much more.

The mix you choose will likely be determined by factors such as your age, investment objectives, and/or risk tolerance. But this model reflects the basic principles of diversification: By investing part of your portfolio in equities and part in bonds/fixed income, you can manage some of the risk that can come with being invested in equities.

Stocks

You can fill your portfolio with stocks, and that would have some upsides and downsides. Most prominently, perhaps, is that stocks, compared to fixed-income assets, offer the potential for higher returns in exchange for higher risk.

If you’re invested 100% in equities, you’re more vulnerable to a market downturn that’s due to systematic risk, as well as shocks that come from unsystematic risk. By balancing your portfolio with bonds, say, which usually react differently than stocks to market volatility, you can offset part of that downside.

Of course, that also means that when the market goes up, you likely wouldn’t see the same gains as you would if your portfolio were 100% in equities.

Bonds

By the same token, if your portfolio is invested 100% in bonds offering a fixed rate of return, you might be shielded to a certain extent from market volatility and other risk factors associated with equities, but you likely wouldn’t get as much growth either.

Other Investments

As noted, you can also add other types of investments to the mix. While a typical portfolio may mostly comprise stocks and bonds, a smaller portion — maybe 10%-20%, just as an example — could hold real estate, or even cryptocurrencies. But again, there would ideally be a mixture of different types of those assets, too, in a diversified portfolio.

Again, a 60-40 portfolio is an example of simple diversification (sometimes called naive diversification) — which means investing in a range of asset classes. Proper diversification would have you go deeper, and invest in several different stocks (domestic, international, tech, health care, and so on), as well as an assortment of fixed income instruments.

Diversification Considerations for Different Stages

It’s also important to take your stage of life into account when considering how to diversify your portfolio and what asset allocation may be right for you.. Broadly speaking, the younger you are, the more risk you may be willing to take with your specific mix of investments (likely more stocks). While stocks may be more volatile and risky in the short-term, they tend to perform better than other lower-risk assets over the long-term.

The older you are, and the closer you are to retiring or needing to liquidate the equity in your portfolio, the less risk you may be willing to take.

Again, this will depend on the individual’s goals and risk tolerance, but consider the stage of your life and investing journey when deciding on your allocation and diversification strategy.

It may be a good idea to regularly review your allocation and change up your asset mix every few years, or work with a financial professional to make sure that your portfolio is aligned with your goals.

6 Ways to Diversify Your Portfolio

To attain a diversified portfolio, it’s important to think through your asset allocation, based on your available capital and risk tolerance. It’s also important to spread investments out within each asset class.

There can be a number of ways to diversify your portfolio, including (but not necessarily limited to) the following strategies.

Invest in a Range of Stocks or Index Funds

Diversifying a stock portfolio requires thinking about a number of factors, including quantity, sector, the risk profile of different companies, and so on.

•   Quantity. Instead of owning shares of just one company, a portfolio may have a margin of protection when it’s invested in many stocks (perhaps dozens or even hundreds).

•   Sector. You may want to think about a range of sectors, e.g. consumer goods, sustainable energy, agriculture, energy, and so on.

•   Variety. Variety is the spice of life, as they say, and variety in the types of stocks you are selecting is also an important factor. A mix of small-, mid-, and large-cap companies may offer diversification. Small-cap stocks, which might include startups, for example, have the potential to offer substantially higher returns than more stable large-cap companies, but they also come with greater risk.

You can further diversify by style. Some investors may opt for a mix of cyclical versus defensive companies, those closely tied to economic growth cycles versus ones that aren’t. Some investors may prefer value vs. growth stocks, companies that are underpriced rather than those that demonstrate faster revenue or earnings growth.

One common way to diversify a stock portfolio is to avoid picking individual stocks and invest instead in a mutual fund or exchange-traded fund (ETF) that offers exposure to dozens of companies or more. This is known as passive investing, as opposed to active. But it can be an effective way to diversify.

Invest in Fixed Income Assets, Such as Bonds

Investing in bonds is a good way to diversify your portfolio because they tend to perform very differently from stocks. Bonds offer a set interest rate, and though bond yields can be lower than the return on some stocks, you can generally predict the income you’ll get from bond investments.

Bonds tend to be less risky than stocks, but they aren’t risk free. They can be subject to default risk or call risk — and can also be subject to market volatility, especially when rates rise or fall. But bonds generally move in the opposite direction from stocks, and so can serve to counterbalance the risk associated with a stock portfolio.

You can diversify your mix of bonds, as well. High-yield bonds offer higher interest rates, but have a greater risk of default from the borrower. Short-term Treasury bonds, on the other hand, tend to be safer, but the return on investment isn’t as high.

You may also consider specific types of bonds, such as green bonds, which typically invest in sustainable organizations or municipal projects, or municipal bonds, which can offer tax benefits. And you can expand your options, and create more diversification, when you invest in bond mutual funds, or exchange-traded bond funds.

Consider Investing in Real Estate

Real estate may provide a hedge against inflation and tends to have a low correlation with stocks, so it can also provide diversification. The housing market and equity market can influence each other — case in point: the 2008 recession, when widespread troubles in real estate led to a stock market crash. But they don’t always have such a strong relationship. When stocks or bonds drop, real estate prices can take much longer to follow.

Conversely, when the markets improve, housing can take a while to catch up. Also, every real estate market is different. Location-specific factors that have nothing to do with the broader economy can cause prices to soar or plummet. Real estate can also be unpredictable and comes with risk, such as illiquidity and changing property values, which is something to keep in mind.

These are all factors to consider when investing in real estate. In addition, there are different types of investments, like Real Estate Investment Trusts (REITs), which can provide exposure to different types of properties without you having to own them.

Alternative Investments

While stocks, bonds, and cash equivalents are among the most common investments, you can diversify your portfolio by putting money into alternative investments, such as commodities, private credit, private equity, foreign currencies, and real estate, mentioned above. Alternatives can also include collectibles, such as art, wine, cars, or even non-fungible tokens (NFTs).

Alternatives have a low correlation with conventional assets, and have the potential to offer investors higher returns. Of course, knowing something about the area you want to invest in, or doing a bit of research, is likely a good idea before you get started.

However, alternative investments can be particularly risky compared to other types of assets. Their values may be particularly volatile and subject to a variety of factors, and it’s possible that some investors may even find themselves being targeted as a part of a scam — which is common, for instance, in the crypto space. Remember that though alternative investments may offer the opportunity to secure high returns, they can also subject investors to high potential losses.

Short-term Investments and Cash

Another possibility is to opt for low-risk short-term investments, such as certificates of deposit (CDs). A CD is a savings account that requires you to keep your funds locked up for a set amount of time (typically a few months to a few years). In exchange it pays you a fixed interest rate that may be higher than a traditional savings account.

A diversification strategy can also involve holding some funds in cash, just in case the bottom falls out on other investments.

International Investments

Another strategy for diversification is to invest in both U.S. and foreign stocks. Spreading out your investments geographically might protect you from market volatility concentrated in one area. When one region is in recession, you may still have holdings in places that are booming. Also, emerging and developed markets have different dynamics, so investing in both can potentially leave you with less overall risk.

Why Is Portfolio Diversification Important?

Diversification is important mainly because it can help investors mitigate risk. Although creating a well-diversified portfolio may help improve performance, risk minimization is the true end of diversification efforts.

Of course past performance is no guarantee that outcomes of those portfolio allocations will be the same in the future. But the research is interesting in that it suggests certain strategies might be effective in mitigating risk.

Introducing greater diversification, by way of bonds and fixed income instruments, actually may create a portfolio with similar returns, but lower volatility over time.

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Pros and Cons of Diversification

As with any investment strategy, diversification has its pros and cons.

Pros

The clearest benefit, or pro, to diversification is that it may help reduce risk in a portfolio. That can create a smoother ride, so to speak, for investors during times of high market volatility, and there is also evidence, as discussed, that diversified portfolios can provide equal or better returns over time.

Cons

The drawbacks to diversification include the fact that short-term gains may be limited by a more risk-averse approach. It can also take more time and energy to manage your portfolio, or to check in and consider your allocation — although that will depend on your specific strategy.

The Takeaway

Portfolio diversification is one of the key tenets of long-term investing. Instead of putting all your money into one investment or a single asset class like stocks or bonds, diversification spreads your money out across a range of securities. Investors should make sure they vary their investments in a way that matches their goals and tolerance for risk.

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FAQ

What is an example of a well-diversified portfolio?

An hypothetical example of a well-diversified portfolio could be one used by hedge fund founder Ray Dalio, who constructed an example portfolio that includes 30% stocks, 40% bonds, 15% U.S. bonds, 7.5% gold, and 7.5% other commodities. Again, this is just one example, and this particular mix is likely not ideal for many investors.

What are the dangers of over-diversifying your portfolio?

The main risk associated with over-diversification is that you stymie your portfolio’s potential gains while seeing diminishing returns in terms of risk mitigation. In other words, you cost yourself potential gains while not meaningfully reducing risk.

When should you diversify your portfolio?

It may be a good idea to diversify your portfolio as soon as you start investing. Further, you can repeatedly check your allocation at regular intervals, to ensure you’re properly diversified in accordance with your risk tolerance, age, and goals.

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Investment Risk: Diversification can help reduce some investment risk. It cannot guarantee profit, or fully protect in a down market.

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