As equity markets globally become more concentrated, active managers are grappling with the challenge of outperforming their benchmarks without holding the top-performing stocks. A recent report by Morningstar highlights this trend, with a particular focus on the UK stock market and its implications for fund managers.
In the UK, market concentration remains a dominant trend, with a few top players driving much of the returns. Michael Born, Investment Research Analyst at Morningstar, notes that although the UK has shifted towards value stocks since 2022, the dominance of a few companies continues to shape the market. “Outside of the top 10 stocks, only 30% of the FTSE 100 have beaten the headline index since January 2022,” Born says. This presents a dilemma for active managers, who need to hold overweight positions in these top stocks to outperform, yet face challenges when market dynamics shift.
Globally, market concentration has primarily been driven by growth stocks, particularly in the US, where the so-called “Magnificent Seven” have led the charge. In contrast, the UK market remains heavily weighted toward value-oriented sectors such as mining, banking, and oil, which have benefited from rising interest rates and commodity prices since 2022. The recent merging of Shell’s European listing onto the London Stock Exchange has further increased concentration in the UK market.
Active managers have found it increasingly difficult to outperform without exposure to the largest stocks. Concentration at the top has led to narrow leadership in the market, pressuring fund managers to invest in these stocks to avoid missing out on returns. However, this can lead to herding behaviour, with managers reluctant to further increase their weights in large-cap stocks, even as these companies drive market gains.
Historically, managers who have ridden the wave of momentum in top stocks have performed well during periods of high concentration. However, when the market environment shifts, these managers are often among the worst performers. This trend has been seen both in the UK and globally, as concentration in a few large names becomes a double-edged sword.
The Morningstar report also highlights that the UK has experienced narrower leadership compared to other global markets. Concentration in the UK peaked at 37% in 2008, and today, the Morningstar UK Target Market Exposure Index has 35% of its holdings in its top five companies, significantly higher than the US equivalent.
The report highlights that while holding the top stocks has been a winning strategy in recent years, the risk of market shifts means that managers must carefully balance their portfolios to avoid the pitfalls of over-concentration.
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