Diversification is the practice of spreading exposure so that one failure does not determine the entire outcome. It reduces some risks, but it cannot eliminate market losses.
What the sources confirm
The JSE notes that ETFs may provide exposure to multiple securities or asset classes through one listed product.[1]
Diversified products still fluctuate because their underlying instruments fluctuate.
Several funds can create the appearance of diversification while holding the same dominant companies.
Diversification is about different drivers
Owning ten companies is not meaningful diversification if all ten depend on the same industry, customer group or economic event.
Useful diversification considers what causes each asset to gain or lose value.
Levels of diversification
A portfolio can be diversified across companies, sectors, countries, currencies and asset types. Each layer addresses a different source of dependence.
- Company: avoid dependence on one business.
- Sector: spread exposure across industries.
- Country: reduce reliance on one economy.
- Currency: understand how exchange rates affect results.
- Asset type: combine assets that behave differently where appropriate.
Hidden concentration in funds
Two funds can look different while owning many of the same companies. A broad global fund and a technology fund may both be heavily influenced by the same large businesses.
Look through the fund names and compare the actual holdings.
More is not always better
Adding more products can create unnecessary duplication, fees and complexity. Diversification should have a purpose.
A student should be able to explain what each holding contributes that the others do not.
Diversification cannot prevent every loss
During major market declines, many assets may fall together. Diversification can reduce company-specific risk, but it does not guarantee a positive result.
Diversification manages dependence. It does not remove uncertainty.
Review concentration as markets move
A holding that grows faster than the rest can become a much larger part of the portfolio. Periodic review helps identify whether the risk has changed.
Rebalancing means restoring the intended allocation. It should be based on a plan rather than emotion.
Frequently asked questions
How many investments do I need?
There is no universal number. Focus on whether the holdings create genuinely different sources of risk and return.
Can two ETFs overlap?
Yes. Compare their top holdings and sector weights.
Does diversification guarantee no loss?
No. It reduces dependence on specific risks but cannot eliminate broad market declines.
Set an intended allocation and a review frequency. Rebalancing can occur at set intervals or when an allocation moves outside a defined range. Consider fees and tax consequences before trading.
Rebalance with rules, not headlines
Investors often prefer familiar local assets. Local exposure can be appropriate, but excessive concentration ties the portfolio to one economy, currency and policy environment.
Understand home-country bias
List each holding and group it by company, sector, country, currency and asset type. Then calculate approximate percentages. The map often reveals duplication that product names hide.
Create an exposure map
Three funds that all own the same companies
Priya owns a broad global ETF, a technology ETF and an innovation fund. She believes three funds provide strong diversification.
After checking the top holdings, she discovers that the same five technology companies dominate all three. The portfolio has three names but one main risk driver.
Your next five actions
- List the top holdings in every fund you own.
- Group exposure by company, sector, country and currency.
- Identify duplicated holdings.
- Remove complexity that does not add a different risk driver.
- Set a regular portfolio review date.
Quick glossary
- Concentration
- A large dependence on one holding or risk driver.
- Correlation
- The degree to which assets tend to move together.
- Rebalancing
- Restoring a portfolio to its intended allocation.
- Asset allocation
- How money is divided among different asset types.
Diversification is not the number of products in a portfolio. It is the number of genuinely different sources of risk and return.
Sources used for this guide
StudyVest prioritises official South African regulators, public institutions and primary material. Links were checked on 5 August 2026.
- 1JSE — Exchange Traded Funds
Official information on ETF diversification and price risk.
- 2JSE — ETF market data
Official ETF market and product information.
- 3FSCA — Financial Consumer
Consumer education and provider verification.