Investment Portfolio Diversification: How to Allocate Investments by Term and Risk

Portfolio diversification means spreading your money across different investments so that no single one determines the outcome. In practice, it involves combining different asset classes, regions, investment terms and risk levels. Diversification does not remove risk, but it reduces the impact of any single investment going wrong.

When people hear the words "investments" and "investors," many still picture very wealthy individuals, funds or corporations with large sums of free capital at their disposal. Today, investment opportunities are far more accessible, and private individuals with comparatively modest amounts are increasingly starting to build their own portfolios. Yet regardless of the amount invested, one success factor remains constant: investment portfolio diversification.

In this article, Kristiāns Purviņš, Head of the TWINO Investment Platform, looks at what diversification means in practice, why it matters so much, what a balanced investment allocation might look like across different budget scenarios, and how to avoid some of the most common diversification mistakes.

Key takeaways:

• Diversification spreads investments across assets, sectors, regions, terms and risk levels

• Asset allocation decides how much goes into each asset class, while diversification decides how widely you spread within and across them

• Diversification reduces risks specific to one company or sector, but not broad market declines

• Holding many similar investments is not real diversification

• A portfolio drifts over time, so periodic rebalancing is part of the process

What is portfolio diversification and why does it matter?

The simplest way to explain portfolio diversification is the age-old wisdom: "don't put all your eggs in one basket."

Investment portfolio diversification means spreading investments across different assets, terms and risk levels. This approach helps reduce risk and the impact of volatility over the long term. In other words, it is about managing risk by avoiding a portfolio that is entirely dependent on a single market, sector or financial instrument.

Diversification can occur across several dimensions:

• Between different asset classes,

• Between different geographic regions,

• Between different investment terms,

• Between different risk levels.

The more balanced the allocation of investments, the more resilient the portfolio tends to be against market volatility.

Diversification vs asset allocation: What is the difference?

Asset allocation and diversification are closely related but not the same thing. Asset allocation is the decision about how much of your portfolio goes into each asset class, for example 60% equities, 30% bonds and 10% alternative investments. Diversification is the decision about how widely you spread your money inside and across those classes.

In other words, asset allocation sets the shape of the portfolio, while diversification determines how concentrated each part of it is. A portfolio can have a sensible allocation and still be poorly diversified, for example if the equity part consists of shares in just two companies.

Why correlation matters

Diversification works best when investments do not move in the same direction at the same time. This relationship is called correlation. Two technology funds tend to rise and fall together, so holding both adds little protection. Assets that react differently to the same economic conditions, such as equities and short-term bonds, usually provide better balance.

What diversification cannot do

Diversification reduces risks specific to a single company, sector, borrower or country. It does not remove market risk, which affects almost all assets during a broad downturn. During major crises, many asset classes fall at the same time, and diversification softens the impact rather than preventing losses.

The most common investment types and their risk levels

To build a balanced portfolio, it is first important to understand the risk levels associated with different investment instruments.

Savings accounts and deposits carry very low risk and offer stable but modest returns.

Government bonds are similarly low-risk and serve as a relatively safe income instrument. Corporate bonds sit at a low to moderate risk level, offering higher returns in exchange for somewhat greater uncertainty.

ETF funds fall in the moderate range, providing broad diversification within a single instrument. Equities carry moderate to high risk but offer strong growth potential, with the trade-off being exposure to market volatility.

Real estate is a moderate-risk asset valued for its stability over the long term. Asset-backed securities (ABS) also sit at a moderate risk level and can generate regular income secured by underlying assets.

It is important to understand that no instrument is entirely without risk. For this reason, investors typically build portfolios in which different assets complement one another.

Risk levels described here are general and indicative. The actual risk of any specific investment depends on its structure, the issuer, the term and the underlying assets, so each investment should be assessed individually.

Investment term and risk tolerance

Two key factors determine the structure of a portfolio: investment term and the investor's risk tolerance.

Investment term refers to the length of time an investor plans to hold their investments.

• Short term, up to 3 years,

• Medium term, 3 to 7 years,

• Long term, 7 years or more.

The longer the investment term, the greater the volatility an investor can typically afford. This means the portfolio can carry a higher proportion of equities.

For shorter terms, more stable instruments are generally more appropriate.

The second factor is risk tolerance, that is, how large a decline in portfolio value an investor is prepared to accept.

For some investors, a 10% drop in portfolio value is acceptable; for others, it causes significant stress. This is precisely why portfolio diversification looks very different from one investor to the next.

It also helps to separate risk tolerance from risk capacity. Tolerance is how much volatility you are emotionally comfortable with. Capacity is how much loss your financial situation can absorb without affecting essential goals. When the two point in different directions, following the lower of the two is usually the safer choice.

When is it smart to start investing?

Is it actually sensible to start investing when your budget is limited and only a small amount remains after covering everyday expenses?

The answer, in most cases, is yes. The earlier a person starts investing, the greater the benefit of the time factor. Even €50 or €100 per month can grow into substantial capital over the long term, particularly thanks to the compound interest effect.

The most important prerequisite before starting to invest is building a financial safety net — typically savings covering at least 3–6 months of expenses.

How to diversify your portfolio step by step

Building a diversified portfolio is easier when it is treated as a sequence of decisions rather than a single choice.

1. Define your goal and time horizon

Decide what the money is for and when you expect to need it. Money needed within a year or two belongs in low-risk options, while money intended for decades can carry more volatility.

2. Set your asset allocation

Decide the proportion of equities, bonds and alternative investments that matches your horizon and risk capacity. This single decision usually has more influence on results than the choice of individual instruments.

3. Spread within each asset class

Inside each class, avoid concentration. Broad index funds cover many companies at once, while in loan-based investments the equivalent is spreading capital across many loans, terms and issuers rather than a few.

4. Add investments that behave differently

Look for assets that do not depend on the same driver. Adding another fund that tracks the same market adds instruments, not diversification.

5. Review and rebalance

Check the portfolio periodically and bring it back toward the intended allocation when it drifts too far.

Portfolio diversification examples

Let us look at what portfolio allocation might look like across different investor budget scenarios.

The allocations below are simplified illustrations used to show how diversification can work at different budget levels. They are not investment advice and not recommended portfolios. A suitable allocation depends on each investor's goals, horizon, risk capacity and tax situation.

If you can invest up to €100 per month

When starting with smaller amounts, simplicity and low costs are paramount.

A possible allocation:

• 70% global equity ETF,

• 20% bond ETF,

• 10% alternative investments (for example, ABS or other structured instruments).

This approach allows investors to gradually build a diversified portfolio even with modest capital.

In addition to traditional investments, alternative financial instruments such as asset-backed securities (ABS) are increasingly being incorporated into portfolios. These are available on digital investment platforms such as TWINO, where investors put capital into a security backed by a loan portfolio rather than a single individual loan.

If you can invest €300–€500 per month

With a larger investment amount, a broader portfolio structure becomes possible.

For example:

• 50% equity ETFs,

• 20% bonds,

• 15% real estate funds,

• 15% alternative investments.

In this case, portfolio diversification already spans multiple asset classes, enabling even more effective risk distribution.

If you can invest more than €500 per month

With larger amounts, the portfolio can be built with even greater strategic depth.

For example:

• 40% global equities,

• 15% emerging market equities,

• 20% bonds,

• 10% real estate funds,

• 15% alternative investments.

At this level, the investment allocation becomes a long-term capital-building strategy in its own right.

The most common portfolio diversification mistakes

Although investment portfolio diversification is not inherently complicated, investors frequently make several typical mistakes in practice.

Excessive concentration in a single asset

One of the most common mistakes is placing too much confidence in one particular investment, such as a popular technology company, the equity market of a single country, or even one real estate project.

Even if a specific asset appears highly promising, excessive concentration significantly increases risk. The whole point of diversification is precisely the opposite: spreading capital so that a single poor investment does not materially affect the entire portfolio.

"False" diversification

Sometimes investors believe their portfolio is diversified because it contains many different instruments, when in reality those instruments may be very similar.

For example, if an investor buys several different technology sector equity funds, the portfolio remains heavily dependent on a single sector.

Effective portfolio diversification means investing across different asset classes, for example equities, bonds, real estate and alternative instruments.

An overly complex portfolio

Another common mistake is building a portfolio that is too complex, particularly for investors with smaller amounts.

If, say, €100 per month is allocated to investments, a portfolio of ten different instruments may create more problems than benefits, because commission fees, management costs and similar expenses can outweigh the potential gains.

In many cases a simpler approach, such as combining a broad equity ETF with a few other instruments, can be far more effective.

Not reviewing the portfolio regularly

Diversification is not a one-time event. Over time, the value of different assets changes, and the original portfolio allocation can shift considerably.

For this reason, investors are advised to review their portfolio periodically and, where necessary, carry out rebalancing, which means restoring the original investment allocation.

How often should you rebalance a portfolio?

Over time, faster-growing assets take up a larger share of the portfolio than intended, which quietly increases its risk level. Rebalancing restores the intended allocation.

There are two common approaches. The first is calendar-based rebalancing, where the portfolio is reviewed at fixed intervals, for example once or twice a year. The second is threshold-based rebalancing, where action is taken when an asset class drifts more than a set amount, for example 5 percentage points, from its target.

For investors who contribute regularly, the simplest method is to direct new contributions toward the underweighted parts of the portfolio instead of selling anything. Rebalancing too often adds costs and possible tax consequences without improving results.

What returns might an investor expect?

Investment returns are never guaranteed, but historical financial market data allows a rough picture to be formed.

Equities have historically delivered approximate average annual returns of 7-10%, while bonds tend to fall in the 3-6% range. Real estate typically yields around 4-7% per year. A well-diversified portfolio combining these asset classes has historically returned around 5-8% annually.

These figures are long-term historical averages across different markets and periods. They are shown before fees and taxes, they vary considerably from year to year, and past performance is not a reliable indicator of future results.

As the comparison shows, a diversified portfolio is rightly considered a balanced approach — it combines growth potential with relative stability.

The compound interest effect also plays a significant role in long-term investment returns.

For example, if an investor contributes €300 per month and the portfolio achieves an average annual return of 6%, the result could theoretically reach:

• Around €49,000 after 10 years,

• Around €139,000 after 20 years,

• Around €301,000 after 30 years.

This calculation assumes a constant return every year and does not account for fees, taxes or inflation. Real results fluctuate, and the same average return achieved in a different order of years produces a different outcome.

In conclusion

Portfolio diversification is one of the most important principles in investing. It helps to spread risk, stabilise portfolio volatility, and build a sustainable investment strategy.

Regardless of whether an investor puts in €100 or €500 per month, a thoughtful allocation of investments across different asset classes can significantly improve portfolio resilience.

In the long run, disciplined investing, regular contributions and well-considered portfolio diversification help build a more balanced portfolio, reduce concentration risk and create a more resilient portfolio structure.

Email: [email protected]

Address: Dzirnavu iela 42, Riga, LV-1010, Latvia

This material is informational and is not an individual investment recommendation.