A board may see holdings in South Africa, Kenya, Nigeria, Côte d’Ivoire and Senegal and conclude that it has spread its African exposure widely. That conclusion can fail under pressure. Different country holdings may depend on the same commodity cycle, the same retreat in foreign investment or the same currency pressures.
Country concentration risk is the extent to which a portfolio depends on one market or on several markets that could suffer similar shocks. For African portfolios, a useful review looks beyond the legal country of each holding to identify the economic connections that country labels can conceal.
This is an investment-policy and governance exercise, not a single continent-wide statutory allocation test. Appropriate risk limits depend on the investor’s mandate, reporting currency, liquidity needs and decision-making process. A clear approach helps investment committees make more confident allocation decisions.
Start with the portfolio you actually own
The first mistake is counting the country flags in a factsheet instead of examining how much capital is exposed to each market. A portfolio that is heavily tilted towards one country can remain concentrated even when it holds securities from many others. Begin with a look-through schedule, not fund names alone.
For each listed share, bond, fund and private-market investment, record the underlying issuer, portfolio weight, legal domicile, principal operating country, sector, trading currency and reporting currency. A fund domiciled in Mauritius may hold Nigerian banks or South African miners, so its registered address does not settle the country-risk question.
Assess country weights
Calculate each country’s share of total portfolio value, then distinguish direct holdings from the underlying exposures inside pooled funds and other investment vehicles.
A portfolio might hold South African equities, Nigerian sovereign bonds, regional West African shares, Kenyan assets and cash. A country-weight schedule shows which exposures are most material and where an adverse event could have the greatest impact. It also reveals whether an apparently diversified portfolio is relying too heavily on a particular market.
Do not stop at legal domicile. A regional bank may earn income across several markets, while a locally listed retailer may depend on imported stock priced in a foreign currency. Review economic drivers alongside registered addresses to form a more realistic picture of risk.
Measure concentration using country HHI
The country Herfindahl-Hirschman Index, or HHI, offers a more meaningful concentration measure than a simple country count. Square each country weight expressed as a decimal, then add those squared weights.
Country HHI = sum of squared country weights
A higher HHI indicates that portfolio exposure is more concentrated. The effective number of countries expresses the same result in a form that can be easier for boards and investment committees to interpret.
Effective country count = reciprocal of country HHI
Used together, country weights, HHI and the effective country count help decision-makers distinguish meaningful diversification from the appearance of diversification. The objective is not to pursue a particular score automatically, but to understand the risk being accepted.
There is no universal HHI limit for an African portfolio. A family office with long-term business links to a market may tolerate more concentration than a pension fund with different liabilities. The investment committee should adopt a suitable range, explain its rationale and review it when circumstances change.
Test geographic exposure against shared shocks
A country schedule is only the first layer. Concentration risk can increase when holdings in different countries respond to the same macroeconomic event.
International Monetary Fund analysis has highlighted fiscal, monetary and external imbalances across parts of Sub-Saharan Africa, alongside sovereign-debt and reserve-buffer pressures. Those vulnerabilities can affect access to finance, investor confidence and currency stability across several markets.
A sovereign shock may spread through local banks, currency markets and listed equities at the same time. Where banks hold significant government debt, investors should consider the connection between sovereign funding pressure and financial-sector performance when assessing country risk.
Group countries by currency bloc
Treat the West African Economic and Monetary Union, or WAEMU, as a shared currency factor where relevant. Its CFA franc has a fixed relationship with the euro, as administered within the regional monetary framework.
Holdings across Benin, Burkina Faso, Côte d’Ivoire, Guinea-Bissau, Mali, Niger, Senegal and Togo can diversify issuers, industries and local operating conditions. However, they do not provide independent exposure to different local currency regimes within that bloc.
An investment company may hold assets in Côte d’Ivoire, Senegal and Benin. Its country report will show exposure to several markets, while its currency-factor report should make their shared CFA-franc exposure visible. Presenting both views helps avoid overstating currency diversification.
For an investor reporting in US dollars, this distinction matters. Examine performance in the local market and again after translating it into the investor’s reporting currency. The translated result is what matters for the investor’s own return and liability commitments.
Separate local returns from investor returns
Currency depreciation and inflation can reduce the benefit of local asset gains for foreign investors. An investment that appears resilient in local currency may look very different when translated into the currency in which the investor measures performance and pays obligations.
Report every material holding in local-currency and base-currency terms. Choose US dollars, euros, rand or another base currency according to the investor’s mandate and liabilities. Local gains can still become base-currency losses when exchange rates move adversely.
This is an investment judgement, not a spreadsheet formality. If an investor has foreign-currency liabilities, local-currency performance alone is not sufficient evidence of diversification. It may conceal the risk the investor ultimately needs to fund.
Test sector, commodity and liquidity overlap together
Country and sector concentration can reinforce one another. South African equity benchmarks, for example, can carry meaningful materials and financial-sector exposure. A portfolio may therefore appear diversified by security name while remaining vulnerable to mining, banking or sovereign-related pressures.
Adding another share from the same market does not necessarily reduce the underlying risk. Examine how earnings, funding conditions and asset prices could move together rather than relying on the number of securities held.
Build a country-sector matrix
Build a matrix with countries in rows and material sectors in columns. Include financials, materials, energy, consumer businesses and telecommunications where these are relevant to the portfolio.
Then ask what happens if country conditions and sector conditions weaken together. Banks in Nigeria, Kenya and South Africa have different home markets, yet they can all face pressure from domestic sovereign risk, weaker currencies or declining access to foreign funding.
An investor may allocate capital across several Africa-focused equity funds and assume that the fund mix provides ample diversification. Look-through analysis can reveal that the funds hold overlapping banks or commodity producers, creating more common exposure than their different names suggest.
With that information, the investment committee can decide whether to adjust allocations, strengthen monitoring or document why it accepts the overlap. The review does not guarantee better returns, but it makes future investment decisions more informed and defensible.
Overlay commodity-export exposure
World Bank analysis has described how adverse terms-of-trade shocks can weaken growth, public revenue, exchange rates and credit conditions in commodity-exporting economies. Shared dependence on an export cycle can create connected portfolio risks across several countries.
Apply this analysis to oil, metals and other commodities where the portfolio evidence supports it. Do not assume that an energy exporter and a mining market provide independent protection simply because they have different country labels. Consider whether weaker global demand, lower commodity prices or tighter financing could affect both.
The level of detail should match the significance of the exposure. Where commodity-linked investments represent a meaningful source of risk, a structured overlay gives the committee a clearer view of potential pressure on public finances, foreign exchange and credit markets.
Include liquidity and sovereign scenarios
A concentration review should show not only where the portfolio is exposed, but also how readily it could respond to a country shock. Some listed instruments trade infrequently, while private assets may be difficult to value or sell quickly. Present realistic liquidity assumptions separately from headline market values.
Stress-test scenarios involving sovereign funding pressure, currency depreciation, commodity-market shocks and withdrawal of foreign capital. For each scenario, identify affected countries, sectors and currencies, together with holdings that may be difficult to sell promptly.
African Development Bank outlooks have highlighted inflation, exchange-rate pressures, debt-service burdens and wider uncertainty as relevant risks across the continent. Good scenario analysis does not claim to predict the next crisis. It shows where losses could arrive through several channels at once.
Build a reporting process that supports governance
Boards do not need sprawling reports to act effectively. They need a focused dashboard showing country weights, HHI, effective country count, currency blocs, sector overlap, commodity links and liquidity assumptions. Clear reporting makes emerging concentrations easier to identify and discuss.
Reassess concentration after significant subscriptions, redemptions, acquisitions, fund rebalances or currency movements. For actively managed public-market portfolios, regular scheduled reviews can help identify drift before it becomes an unintended position.
Document the decision as well as the calculation. If the committee accepts substantial exposure to one market because it knows the issuers well, has a long investment horizon or holds matching local liabilities, record that rationale. Strong governance makes such choices visible and accountable.
Risk measurement should also be distinguished from a recommendation to sell. Concentration may be justified for a strategic investor. It becomes a concern when it is accidental, poorly measured or inconsistent with the investor’s objectives and base-currency obligations.
Common mistakes we ask investment committees to correct
Counting countries rather than weighted exposure
Holding assets from many countries does not automatically produce balanced risk if a large share of the portfolio is tied to one market. Measure country weights and HHI to understand which exposures would have the greatest impact.
Treating CFA-franc markets as independent currency positions
WAEMU holdings may provide issuer and political diversification, but their shared CFA-franc framework creates a common euro-linked currency factor. Report country exposures and currency factors separately.
Using only local-currency performance
Investors with foreign-currency liabilities ultimately experience translated returns. A local-market gain can conceal currency-related losses, so reports should explain both local performance and performance in the investor’s base currency.
Ignoring index construction and liquidity
An index label can disguise meaningful concentration in particular sectors or issuers. Review underlying constituents, sector weights, trading conditions and exit assumptions before treating an index fund as a broadly diversified allocation.
Frequently Asked Questions
What is country concentration risk?
Country concentration risk is the possibility of outsized portfolio losses because a large allocation, or several connected allocations, depends on similar country conditions. Relevant pressures include sovereign funding, currency movements, banking-system exposure, commodity cycles and liquidity.
How do we calculate the effective number of countries?
First calculate country HHI by adding the squared decimal weights of each country. Then take the reciprocal of HHI to estimate the effective country count. Used alongside country weights, this provides a clearer view of portfolio concentration than simply counting the markets represented.
Do WAEMU investments diversify currency risk?
They may diversify issuers and local operating conditions, but the CFA franc’s fixed relationship with the euro means they share a common currency factor. Country diversification and currency diversification should be evaluated separately.
How often should an African portfolio undergo concentration testing?
The right review frequency depends on the portfolio’s turnover, liquidity, mandate and exposure to market movements. Active listed portfolios generally benefit from scheduled reviews, supplemented by event-driven assessments after material capital movements, rebalances or acquisitions. Private portfolios may place greater emphasis on valuation and liquidity events.
A measured concentration review can give boards and investment committees greater clarity about their exposures, stronger governance records and a sounder basis for allocation decisions. If you want help assessing country, currency, sector and liquidity risks in an African portfolio, speak with the M&J Africa team about tailored investment advisory and business strategy support. Enquire for a proposal and quotation aligned to your portfolio, objectives and reporting needs.