Markets are hitting record highs, but a handful of giant companies are doing most of the heavy lifting. With concentration risk rising and investors wondering whether to wait for a pullback, the real question is: does timing the market ever truly pay?
The top five companies now make up around 22% of the developed market’s value (see chart below), raising concerns about concentration risk and whether investors should hold off. But while it’s tempting to wait for a dip, history shows that those who stay invested tend to outperform those trying to time the perfect moment.
Where the markets stand
All four US stock market indices recently reached record highs (S&P 500, Dow Jones Industrial Average, Nasdaq Composite, Russell 2000), supported by continued strong earnings growth and easing monetary policy.
A striking feature of this rally is its concentration. Nvidia notably became the first company to hit $5 trillion in market cap, meaning the single company would now rank 6th in market cap of a list of global stock exchanges. That’s bigger than every national market except the US, China, Japan, India, and Hong Kong.
This dominance underscores strong investor confidence in established names but also leaves the market more vulnerable should those leaders stumble. It’s not a new phenomenon. Similar patterns emerged during past eras of market concentration, from the 1960s “Nifty Fifty” to the tech-driven surge of the late 1990s.
The temptation to wait
It’s natural for investors to hesitate when markets are near all-time highs. Many worry about buying at the top, uncertain earnings outlooks, or the possibility of an overdue correction. These concerns are valid. Yet the challenge lies in predicting short-term market movements, which even seasoned professionals struggle to do consistently. History shows that missing just a handful of the market’s best-performing days can significantly cut long-term returns.
Tip: Rather than waiting for the “perfect moment,” investors should focus on what they can control –diversification and discipline.
Time in the market matters
Decades of data show that investors who remained in the market generally outperformed those who tried to jump in and out around short-term fluctuations. Since 2000, a formal market correction (i.e. exceeding –10%) has occurred roughly every other year on average.
The magic of compound growth depends on time, and missing even a few early or strong years can meaningfully erode long-term wealth. Volatility will always be part of the journey, but down-turns are temporary while the market’s overall trend remains upward. Investors who missed out on the 9 April 2025 bounce back (a single day) have lagged the S&P 500 by nearly 10% over the course of 2025.
Areas of opportunity
After years of political interference from the US government, the healthcare sector is now trading at a historical discount to the broader market. Yet the long-term fundamentals remain exceptionally strong.
An ageing global population and rising demand from emerging markets – where healthcare spending is still a fraction of Western levels (India spends roughly just 1% of average spend of US individuals) provide powerful structural tail-winds. In the shorter term, the sector is also poised to benefit from AI, which could significantly compress decade-long clinical trial time-lines and improve success rates in drug discovery.
[i] When markets keep shifting, it can paralyse you from making smart investment decisions. In need of some guidance? Call 03300 564 446 or get in touch via our contact form to learn more.
This article is for general information purposes only and does not constitute financial advice or a personal recommendation. Past performance is not a reliable indicator of future results. Investments can rise or fall in value, and you may receive less than you originally invested. Tax treatment depends on individual circumstances and may change in the future.
