Can you own several funds and still lack diversification?
Yes. Different fund names do not necessarily mean different underlying investments. Several funds can hold many of the same companies, favour the same sectors or respond to the same economic conditions. To understand diversification, look through the account and fund labels to the risks underneath.
The aim is not to reach a particular number of funds. It is to understand whether too much of your outcome depends on the same things going well, and whether the overall mix fits the job the money must do.
Start with the underlying assets
A fund pools investors' money into a collection of assets. Its name may describe a region, strategy, asset type or commercial brand. Two funds described differently can still own overlapping investments. Conversely, one broadly invested fund can contain many holdings.
A fund's factsheet is a useful starting point. Look for its objective, benchmark, asset allocation, regional exposure and largest holdings. Check the date: it is a snapshot, not a promise that the portfolio will remain unchanged. The largest holdings also show only part of the picture, so they cannot establish the complete overlap by themselves.
Ask what the fund is intended to add to the portfolio. If the answer is simply that its recent performance looks attractive, that does not explain how it changes the overall risk. A role such as exposure to a particular asset class is more specific, although whether that exposure is suitable remains a separate question.
A worked example of hidden concentration
Imagine a £100,000 portfolio divided equally between two fictional funds. Fund A holds 10% in Company X. Fund B holds 8% in the same company. Your indirect exposure is £5,000 through Fund A and £4,000 through Fund B, totalling £9,000 or 9% of the portfolio.
| Holding | Portfolio allocation | Company X within the fund | Indirect exposure |
|---|---|---|---|
| Fund A | £50,000 | 10% | £5,000 |
| Fund B | £50,000 | 8% | £4,000 |
| Total | £100,000 | Not added directly | £9,000 |
The fund percentages should not simply be added to produce 18% exposure. Each must first be weighted by the amount invested in that fund. The example is deliberately simple and ignores other holdings, changes in prices and the possibility that the funds hold related instruments.
Now imagine you also own Company X shares directly or work for the company. The household's dependence on its fortunes could be greater than the fund statement suggests. Investments, earnings and future share awards can create connected exposures that sit in different documents.
Diversification has several dimensions
Company concentration is only one question. Assets may also share exposure to a sector, country, currency, interest rates or the availability of credit. A portfolio can contain many securities while remaining concentrated in one broad source of risk.
The FCA describes diversification as spreading investments across different products and areas so that an outcome is less dependent on one investment. It does not remove the possibility of loss. Different investments can fall together, especially during widespread market stress. FCA: diversification.
Be careful with everyday descriptions such as defensive, balanced or global. They do not provide a universal measurement of risk. Ask what the description means in the particular fund and how its holdings combine with the rest of your investments.
Separate investment diversification from account administration
Using two platforms does not necessarily diversify investments if both accounts hold the same assets. Equally, consolidating administration onto one platform does not necessarily reduce investment diversification if the underlying mix remains broad.
The platform, fund manager, investment holdings and legal protections are different aspects of the arrangement. Each can deserve investigation, but one should not be used as a shorthand for the others. Ask which particular risk a proposed change is intended to address.
Multiple providers can also create administrative costs. You may need to reconcile different valuation dates, reports, charges and tax records. Simpler administration can be useful, but a tidier dashboard does not itself establish a better investment portfolio.
Do not make a trade from a partial overlap check
Spotting repeated holdings is a reason to investigate, not an automatic instruction to sell. Some overlap may be intentional. A change may also create dealing costs, tax consequences, time out of the market or loss of a feature elsewhere in the arrangement.
Ask for an explanation of the overall allocation and the contribution each holding makes. Compare the current arrangement with any proposed change using the same objectives and assumptions. If an adviser recommends several similar funds, ask whether the combination offers a distinct benefit after charges.
If you are managing investments yourself, record the purpose of each holding and the circumstances under which you would review it. Without that record, adding a fund can become a response to a persuasive article rather than a considered change to the portfolio.
A useful review record
Keep the account owner, account type, fund name, value date and allocation together. Add the broad asset and regional exposures where available, plus any direct holdings or employer shares that might overlap. Record uncertainty instead of inventing missing percentages.
The result should help you ask better questions: what dominates the outcome, which risks are deliberate, and which have accumulated unnoticed? It does not need to produce a perfect mathematical score to be useful. The most important discovery may be that three apparently separate financial decisions depend on the same company or market.
Related reading
Sources and context
General educational information, not personal financial advice. Examples are illustrative unless identified as recorded evidence.
Sources checked 18 September 2026. Our editorial standards.