How to Build a Globally Diversified Investment Portfolio

Home bias: It’s a problem a lot of investors have. They invest where they feel most comfortable.

In the US, it means your portfolio is overweight in US stocks. In Singapore, you likely have more domestic REITs and blue chip bank stocks. But while home bias can feel like safe harbour, it’s not very diversified.

Diversification should be cross-border. Spreading your investments across regions, economies, and currencies. This doesn’t just mean different companies in different sectors. The world is a much bigger place than that.

Markets are evolving with new geopolitical shifts, emerging markets and currency changes. Sticking with domestic assets in one national currency is not smart risk management. It’s a missed opportunity.

In this post, I want to discuss how you can build a globally diversified portfolio. And how to do it in a way that really works.

Table of Contents

What is a globally diversified portfolio?

At its simplest, a globally diversified portfolio is an investment strategy that spreads capital across different countries, asset classes, and sectors. The objective is to reduce risk, increase growth potential and protect against localised shocks.

It’s like planting your roots deep and wide. If one area gets hit with a cold (say from inflation, political uncertainty or recession) others may flourish.

Historically, markets have not all moved in the same direction. US markets may outperform in certain years. But other years, emerging markets or European stocks may shine. Currency and trade cycles, interest rate environments and growth drivers vary worldwide, and a globally diversified investor wants a slice of all of it.

A well-constructed globally diversified portfolio includes these principles.

Real world examples: why going global makes sense

Let’s look at real data.

From 2000–2010, many people called this the “lost decade” for US stocks. For the first ten years since the turn of the century, the S&P 500 returned almost 0% total return (adjusted for inflation).

But if you owned global equities over the same period—especially emerging markets like Brazil, China and India—you would have done very well. MSCI Emerging Markets Index returned about 14% per year.

Fast forward to the 2010s. US markets were absolutely dominant. Fueled by tech sector growth, the S&P 500 outpaced most global peers. But that outperformance is by no means guaranteed to continue. In fact, US stocks are currently trading at a premium, while many international markets are cheaper on valuation metrics.

If you were globally diversified, you would have benefited from both decades. Rather than betting everything on one geography.

Core principles of a globally diversified portfolio

Geographic diversification

Your portfolio should have a mix of:

Developed markets (e.g. US, Japan, UK, Germany, France)
Emerging markets (e.g. China, India, Indonesia, Brazil, Mexico)
Frontier markets (smaller growth economies)
Each market has different risk-return, interest rate and political risk profiles. When one place zigs, another can zag.

Currency diversification

By investing globally, you automatically gain exposure to different currencies: USD, EUR, JPY, SGD, INR and more. This is an effective hedge if your local currency depreciates. For example, if you are a Singaporean investor and the SGD weakens, your investments in US assets (denominated in USD) automatically rise in SGD terms.

Asset class diversification

Don’t just think of stocks. Diversify globally across:

International bonds
Global real estate (REITs) in different regions
Commodities and natural resources
Inflation-protected or gold assets

All these assets can behave differently across different market cycles. This further reduces portfolio volatility.

Avoid overconcentration

Diversification is not just about having lots of different holdings. If 90% of your stocks are US tech names or Singapore REITs, your portfolio is not truly diversified. It requires intelligent weightings across regions, currencies and asset classes.

Practical steps to building a globally diversified portfolio

Step 1: Start with a global equity ETF

If you want one low-cost, no-hassle way to get diversified global exposure, start with a total world stock ETF. Here are some examples:

VT (Vanguard Total World Stock ETF). This gives you exposure to both US and international markets.
ACWI (iShares MSCI ACWI ETF). This fund has exposure to over 40 countries and thousands of stocks.

These ETFs automatically allocate among different countries based on their market capitalization. This way you get exposure to US, Europe, Japan, China, and other emerging markets. All in one fund.

If you want to separate US and international exposure, then you can use:

VTI (Vanguard Total US Market)
VXUS (Vanguard Total International Stock)

Step 2: Add targeted regional funds

Once you have your core allocation to global stocks, you can then tilt your portfolio based on your specific views or opportunities.

For emerging markets, you can add VWO (Vanguard Emerging Markets) or EEM (iShares).

Europe-focused funds like VGK (Vanguard Europe) or EZU (Eurozone).

Asia-Pacific funds like AAXJ (Asia ex-Japan), EWY (South Korea), EPI (India).

This way you overweight regions you think will outperform over the next 5–10 years due to demographics, innovation or valuations.

Step 3: Include global bonds

Don’t forget fixed income exposure. Consider:

BNDX (Vanguard Total International Bond ETF)
IGOV (iShares International Treasury Bonds)

These funds give you access to government and corporate bonds from Europe, Asia and other developed markets. You can even add emerging market bonds if you have a higher risk tolerance.

Step 4: Diversify with Global REITs, gold, commodities

VNQI (Vanguard Global ex-US REIT)
RWX (SPDR Dow Jones Global Real Estate)

These global REITs give you exposure to international real estate markets outside your home country. They can provide good dividend income and also serve as an inflation hedge.

To further diversify, you can even add:

Gold (GLD)
Commodities (DBC, GSG)
Global infrastructure funds

Step 5: Rebalance your portfolio

Markets move around and your global allocation will drift over time. Periodically rebalancing (say once a year or when your allocation drifts >5%) helps maintain your target risk profile. This can be easily done using many of the ETFs mentioned above.

You can also rebalance on valuations. For example, if US stocks become super expensive compared to international markets, then shift some allocation out of US equities.

An example portfolio

Okay, let’s say you’re a 30-year old investor with a moderate risk profile. Here is a globally diversified portfolio you could consider:

Asset class Allocation
US Total Market (VTI) 30%
International Developed (VEA) 25%
Emerging Markets (VWO) 15%
International Bonds (BNDX) 10%
US Bonds (BND) 10%
Global REITs (VNQI) 5%
Gold (GLD) 5%

Notice this is very well diversified across asset classes, global equities, fixed income, real estate and inflation protection. It’s spread across different currencies and economies.

Avoid these common mistakes

Home bias: Don’t overweight your home country because it feels safe.
Chasing recent performance: Global diversification is a long-term strategy. Don’t get out of international markets just because they have a few down years.
Currency anxiety: Currency volatility is part of global investing. Historically, it evens out over time and your portfolio benefits from broader global exposure.
Piling on too many funds: Diversification doesn’t mean buying a hundred different ETFs. Stick to a clear strategy and avoid overlapping exposures.

Tools that make it easy

Don’t need to build this portfolio manually. Robo-advisors like Wealthfront and Betterment (US) or Syfe and StashAway (Asia) automatically diversify your funds across global markets. They also rebalance on your behalf.

Just be aware of the fees and understand their underlying strategies.

Final thoughts

The world is going global fast. Capital is increasingly borderless. The biggest opportunities no longer sit only on your home exchange.

Investing globally gives you the best risk-adjusted growth potential. It allows you to participate in dynamic regions and undervalued markets.

A globally diversified portfolio is your passport to building resilient growth across economies. So think bigger than borders.

Build a solid core. Layer on some region-specific exposure. Be patient and stay consistent.

Your future self will thank you. No matter where in the world they may live.

Keep learning: courses on this topic

Self-paced courses to put this article into practice.

How to Build a Globally Diversified Investment Portfolio

What is a globally diversified portfolio?

Real world examples: why going global makes sense