Concentration of Risk

Concentration of risk is the danger that too much of your wealth depends on a single asset, sector, employer, or currency. One adverse event can cause a loss you cannot recover from. I see this risk show up regularly in my conversations with clients, and it is almost always preventable.

If more than a meaningful portion of your retirement savings sits in one place, whether that is one company’s shares, one rental property, one employer’s pension scheme, or one currency, you are exposed. Diversification is the standard remedy: spreading your assets across different categories so that a loss in one area does not destroy the whole.

This matters for anyone building towards retirement, but it matters most once you have stopped earning. At that point, you no longer have a salary to absorb losses and rebuild. Your capital is the asset that generates your income. Protecting it from concentrated exposure is not a sophisticated strategy. It is basic financial hygiene.

If you are reviewing your own portfolio, the questions are always the same: where is my money, how much sits in each position, and what happens to my income if that position fails? This article walks you through identifying concentration risk in your portfolio, understanding why it is particularly dangerous in retirement, and taking practical steps to reduce it.

The Main Types of Concentration Risk

Concentration risk falls into several distinct categories, and most portfolios are exposed to more than one. Understanding each type helps you identify where your own weak points are before a loss forces the lesson on you.

Single-stock concentration. This is the most visible form. I have worked with clients who accumulated a large block of Naspers or Prosus shares through an employee share scheme, and those shares represented the bulk of their net worth. A regulatory change affecting Tencent (in which Prosus holds a major stake) can move both shares significantly in a short period. That concentration point becomes a single point of failure for the entire portfolio.

Sector concentration. Even without a single-stock problem, a portfolio weighted heavily toward financials, resources, or property is exposed to sector-level shocks. South African unit trust investors who favour only JSE-listed equity funds may hold more mining and banking exposure than they realise. You can think you are diversified when you are actually concentrated in a few dominant industries.

Employer or pension concentration. Many South African workers have both their salary and their retirement savings tied to one employer. This is especially pronounced for government employees whose entire retirement benefit comes from the GEPF, the Government Employees Pension Fund. These members have no supplementary private savings outside it, meaning their financial security rests entirely on one institution.

Geographic and currency concentration. A portfolio held entirely in rand-denominated assets is concentrated in one currency and one economy. Reducing rand-only exposure by investing offshore is one of the most effective ways to address geographic concentration. Currency diversification introduces a layer of protection that purely local portfolios do not have.

Asset class concentration. Holding most of your wealth in a single asset class, such as residential property, exposes you to liquidity risk on top of price risk. You cannot sell half a house quickly when you need cash. I have seen retirees whose wealth is locked in property, unable to access it for income without disrupting their living situation.

Why Concentration Risk Is Especially Dangerous in Retirement

Concentration risk is more dangerous in retirement than at any earlier stage of your life because you no longer have time or income to recover from a large loss. Once you begin drawing income from your capital, a sharp fall early in retirement can permanently impair your portfolio.

This is called sequence-of-returns risk, and it works against you in a straightforward way. Suppose you retire with R3 million in a living annuity and draw 5% per year, which is R150,000 in year one. If your portfolio falls 30% in the first year because of a concentrated position in one sector, your capital drops to roughly R2.1 million after that drawdown. You now need a 43% gain just to get back to where you started. But you are still drawing R150,000 every month. Each withdrawal reduces the capital base that needs to recover.

Compare that to a diversified investor who falls 10% in the same year. Their portfolio drops to roughly R2.7 million after drawdown. The recovery required is much smaller, and their income is not at risk in the same way.

The numbers shift permanently once your drawdown rate and your capital loss compound together. For a concrete worked example of how much monthly income a given capital amount can realistically produce, the relationship between capital size and sustainable drawdown becomes clear very quickly.

A life annuity removes this risk entirely by converting your capital to a guaranteed income stream, but it comes with its own trade-offs. You surrender flexibility and access to your capital. The choice between a living annuity and a life annuity is one of the most consequential decisions you will make at retirement. Neither is right or wrong, but concentration risk shifts the balance between them.

Concentration Risk in the South African Context

Concentration risk shows up in specific and sometimes overlooked ways for South African investors. The local market structure, the dominance of certain counters, and the structure of public-sector retirement benefits all create concentration exposures that are worth naming directly.

The JSE All Share Index is itself a concentrated index. Historically, a small number of shares, including Naspers and Prosus, have at times accounted for a disproportionate share of the index’s total market capitalisation. A tracker fund that mirrors the ALSI gives you the illusion of broad diversification while still delivering significant single-name exposure. You think you are broad when you are not.

For public servants, the GEPF is the primary retirement vehicle. It is a well-governed fund with a defined benefit structure, but it represents concentration of a different kind: your entire retirement benefit depends on the financial health of one institution and on the government’s ability to fund its obligations. Members who have no private savings outside the GEPF are, by definition, concentrated. This is not a criticism of the GEPF itself. It is a statement of fact about portfolio structure.

Regulation 28 of the Pension Funds Act is designed as a structural guardrail against concentration within retirement funds. In plain language, it limits how much of a retirement fund can be placed in any single asset class. For example, there are caps on listed equity, property, and offshore exposure. These limits apply to retirement annuities, pension funds, and preservation funds. Regulation 28 does not apply to discretionary investments held outside a retirement fund, so your total picture can still be concentrated even if your RA is compliant.

Property investment is another common concentration point. A retiree whose wealth is split between one rental property and one pension fund holds two assets in one country. Adding offshore equities or other asset classes changes that picture materially.

If your values require Shari’ah compliance, diversification options do exist. Shari’ah compliant unit trusts, sukuk instruments, and offshore Islamic funds allow you to spread risk without compromising on principles. A broader retirement planning approach should account for this from the outset, not as an afterthought.

How Do I Know If My Portfolio Is Too Concentrated?

You can identify concentration risk in your own portfolio through a structured self-audit. Start with a complete asset inventory, then look through each fund to its underlying holdings, before calculating how much of your total wealth sits in each category.

Here is a practical sequence to follow:

1. List every asset you own. Include retirement annuities, pension funds, preservation funds, discretionary unit trusts, direct shares, property, endowments, and any offshore accounts. Get it all on one spreadsheet. This step alone reveals patterns you cannot see when assets are scattered across different providers and statements.

2. Apply the look-through principle. A unit trust is not one asset; it is a container holding many underlying instruments. If you hold three different equity funds that all track the JSE, you may think you are diversified across three products when you are actually concentrated in the same underlying shares. Look at the top ten holdings of each fund, not just the fund name.

3. Calculate your percentage exposure by asset class. Add up how much sits in South African equity, offshore equity, bonds, cash, and property as a percentage of your total investable assets. The split will surprise you in most cases.

4. Calculate your exposure by geography and currency. What percentage of your total wealth is rand-denominated? What percentage is offshore? This number matters more than most investors think, especially when rand weakness accelerates.

5. Identify any single position above roughly 10% of total wealth. There is no universally agreed threshold, but a single position representing more than 10% of your total net worth is worth examining closely. Above 15% to 20%, it becomes material to your overall risk profile.

Comparing Approaches to Reducing Concentration Risk

The main ways to reduce concentration risk differ in what they address, which products are available in South Africa, and what trade-off you accept. There is no single solution that works for everyone.

No single approach eliminates all concentration at once. Most investors benefit from combining several. Investing offshore addresses geographic and currency concentration. Pairing that with a fixed annuity as a low-risk income anchor addresses sequence-of-returns risk in retirement. The right balance depends on your total picture and your stage of life.

Practical Steps to Reduce Concentration Risk

Reducing concentration risk starts with accepting that you probably have more of it than you think, then taking deliberate action rather than waiting for a loss to prompt one.

Step 1: Complete the self-audit described above. You cannot fix what you have not measured. Spend an afternoon gathering statements. List everything. You will see the problem clearly once you do.

Step 2: Prioritise the largest single exposure first. If one position represents more than 15% to 20% of your total wealth, that is where the most risk sits. Address it before anything else. The temptation is to spread your attention across everything at once. Resist that. Start with the biggest problem.

Step 3: Sell concentrated positions gradually to manage capital gains tax. Disposing of a large holding in one transaction can trigger a substantial CGT liability. Spreading sales across two or more tax years is a commonly used strategy to keep annual gains within more manageable brackets. Your tax bill can be as important as the asset reallocation itself.

Step 4: Redirect proceeds into diversified vehicles. A discretionary multi-asset fund, a global equity feeder fund, or a Regulation 28-compliant retirement annuity can all absorb the proceeds while spreading risk across asset classes and geographies. The vehicle you choose depends on whether you are still working, when you plan to retire, and your tax position.

Step 5: Address the behavioural bias directly. Concentrated positions often feel safe because they are familiar. An employer’s share scheme, the family property, the single fund you have held for twenty years, all feel less risky because you know them well. Familiarity is not the same as safety. I have seen that bias cost clients dearly. Recognising it is the first step to overcoming it.

Step 6: Review the portfolio at least annually. Markets move. A position that was 8% of your portfolio can drift to 20% over a bull run without a single new purchase. Once a year, pull the numbers again. It takes an hour and keeps you honest.

A qualified financial planner can help you sequence these steps efficiently, especially where tax and product selection intersect. The instinct to wait for the right moment to diversify is itself a form of inaction that compounds your concentration. The best time to start is now.

Frequently Asked Questions

What is an example of concentration risk?

A South African investor who received Naspers shares through an employee scheme and never diversified them holds a classic example of single-stock concentration risk. If that one holding represents the majority of their investable wealth, a sharp fall in the share price directly threatens their financial security. I have seen that exact scenario play out.

Is concentration risk the same as market risk?

No. Market risk affects all assets broadly when the overall market falls. Concentration risk is the additional, avoidable risk you take on by holding too much in one position. A diversified investor still faces market risk but avoids the amplified loss that comes from concentration.

How much of my portfolio should be in one stock?

There is no universally prescribed limit, but many financial planners treat a single position above roughly 10% of total investable wealth as a concentration that warrants attention. Above 20%, the risk is considered significant by most practitioners, though your circumstances determine the right response.

Does Regulation 28 protect me from concentration risk?

Partly. Regulation 28 sets asset class limits inside retirement funds such as pension funds and retirement annuities, which prevents extreme concentration within those products. It does not govern your discretionary investments, property holdings, or direct share portfolio, so your overall financial picture can still be heavily concentrated even if your retirement fund is compliant.

Can I be concentrated even if I hold many funds?

Yes. If multiple funds all hold the same underlying shares or track the same index, you are effectively concentrated regardless of how many fund names appear on your statement. The look-through principle, examining the actual holdings inside each fund rather than the number of fund labels, is the only reliable way to check.

What happens to concentration risk in a recession?

Concentration risk becomes catastrophic in a recession. Diversified portfolios take moderate hits. Concentrated portfolios can face permanent losses from which they never recover, especially if you are drawing income at the same time. This is why sequence-of-returns risk matters so much in early retirement.

Should I sell concentrated positions all at once or gradually?

Gradual selling usually makes sense from a tax perspective. A single large sale can push you into a much higher capital gains tax bracket. Spreading the sale across two or more tax years often results in a smaller total tax bill, even if it takes longer. Your tax advisor can model the optimal sequence for your situation.

What if my concentration is in property?

Property concentration is tricky because you cannot easily diversify a single house without selling it entirely. Options include adding complementary investments outside property, such as offshore equities or bonds, to balance your overall portfolio. Some retirees eventually downsize their property and redeploy the capital, but that is a major decision with lifestyle implications as well as financial ones.

The Key Takeaway

Concentration of risk is the single most preventable cause of permanent capital loss in a retirement portfolio. You can absorb a market downturn if your assets are spread across different positions, asset classes, and currencies. You struggle to recover from one if most of your wealth sat in the position that fell.

The practical action is straightforward: audit what you own, identify where the heaviest exposures sit, and reduce them deliberately. Build this into your retirement plan from the start, not as an afterthought. If you are unsure where to start, a qualified financial advisor can help you map your current exposures and design a reallocation strategy that fits your tax position and timeline.

The cost of addressing concentration risk is small compared to the cost of ignoring it.

This article is general information and does not constitute personal financial advice. Your individual circumstances, risk profile, and tax position will affect which steps are appropriate for you. Please consult a qualified financial planner before making any changes to your portfolio.