Diversifying investments reduces risk, but many investors approach it incorrectly. The aim isn’t merely to accumulate more assets—it’s to prevent any single holding from crippling a portfolio when markets decline. Spreading money across different asset types, regions, and investment styles helps, though simply chasing last year’s top performers won’t work.
The principle relies on assets moving independently. When stocks decline, bonds often remain stable, or gold may rise while real estate falls. However, this only holds true if those assets aren’t tied to the same economic forces.
Rob Morgan, chief analyst at Charles Stanley Direct, explains that no single sector remains dominant indefinitely. Holding too few or overly similar investments can yield strong returns temporarily, but risks sharp declines. James Scott-Hopkins, founder of wealth manager EXE Capital Management, adds that excessive diversification can also harm performance. He compares it to a balanced diet—moderation is essential.
Darius McDermott, managing director at FundCalibre, uses a different analogy: diversification isn’t just about avoiding one basket for all your eggs. If every basket sits on the same cart, a single bump affects them all. True diversification requires assets that respond differently to the same market shock.
The biggest oversight for most investors isn’t the number of funds they own—it’s the overlap between them. A global tracker fund may seem like a safe, hands-off option, but with U.S. stocks making up a large portion of global indices, the portfolio becomes far less diversified than intended.
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This concentration extends beyond the U.S. Many investors assume an emerging markets tracker provides exposure to fast-growing economies, but they often end up heavily weighted in specific sectors.
Most investors don’t recognize their exposure until it’s too late. Morgan highlights warning signs:
- Portfolio values swing sharply even during stable market conditions.
- Holdings consist mainly of individual stocks or niche funds, with little exposure to broad index trackers or multi-asset funds.
- Most investments move in the same direction simultaneously, even if some rise or fall more than others.
James Scott-Hopkins warns of concentration risk, noting that nearly half the S&P 500 is in AI-related businesses.
For those seeking simplicity, multi-asset funds handle much of the work. These ready-made portfolios combine stocks, bonds, and other assets in a single package, often with automatic rebalancing. Jupiter Merlin Balanced Portfolio, for instance, holds 40-85% in equities alongside bonds and other assets. Morgan cautions that no single multi-asset fund suits everyone. Investors should choose one matching their risk tolerance or consider combining several.
A global tracker fund provides broad exposure but may include more U.S. exposure than expected. Morgan suggests pairing it with other strategies to reduce concentration. Equal-weighted funds, which assign the same weight to each company in an index rather than weighting by market capitalization, help. This approach reduces reliance on dominant stocks and shifts the portfolio toward more stable companies.
For U.S. exposure, he recommends holding both a standard S&P 500 tracker and an equal-weighted version, such as the Legal & General S&P 500 Equal Weight Index fund. For global exposure, the Invesco MSCI World Equal Weight UCITS ETF spreads risk more evenly across sectors like industrials, real estate, and utilities.
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Defensive global equity funds offer another option. JO Hambro Global Opportunities avoids dominant sectors entirely, providing a counterbalance to a global tracker. Trojan Global Income prioritizes quality and predictability over growth. Factor funds, like the Invesco RAFI US Fundamental Value ETF, diversify without relying on a fund manager’s judgment. These passive investments weight holdings based on metrics like sales, cash flow, and dividends rather than market cap.
McDermott provides a four-step guide to diversification:
- Avoid over-reliance on equities. Bonds, real assets, and alternatives can reduce volatility.
- Within equities, spread risk further. Chasing last year’s winners often leads to correlated movements when trends reverse.
- Review the portfolio every six to 12 months, and use ISAs and pensions to maximize tax efficiency.
- If managing diversification seems overwhelming, multi-asset funds handle the work.
Where investments are held matters as much as what they are. Workplace pensions offer a cheap, tax-efficient option, though funds are locked until at least age 55 (or 57 from 2028). Stocks and shares ISAs provide flexibility—contributions are made after tax, but growth and withdrawals remain tax-free. Matching accounts to goals is key. Retirement savings may suit a pension, while shorter-term needs call for an ISA.
Diversification requires ongoing attention. Markets change, and so do personal circumstances. A portfolio suitable in your 30s may be too risky in your 50s. Morgan advises considering time horizon and risk tolerance at every stage. Taking too little risk early can mean missed opportunities, while excessive concentration later in life may expose investors to volatility at the worst moment.
The strongest portfolios develop gradually. Small, deliberate choices—adding a bond fund, trimming a stock position, rebalancing when one asset class grows too large—build them over time. The objective isn’t to eliminate risk entirely but to ensure no single bet can derail long-term plans. This might mean missing out on the next big trend, but it also means avoiding the next major downturn.
