The Magnificent 7: Why Yesterday’s Winners May Not Be Tomorrow’s Champions

Financial advisers are facing intense pressure from clients: should portfolios be loaded up on the Magnificent 7 stocks (Apple, Microsoft, Amazon, Alphabet, Meta, NVIDIA, and Tesla)?

These tech giants have delivered spectacular returns and now dominate America’s largest companies. Clients’ friends are bragging about gains, financial media breathlessly covers every earnings report, and the fear of missing out is palpable.

But financial lessons tell us to look beyond the headlines and recent performance – and market history suggests this caution is warranted.

The Illusion of Permanence

When we look at today’s market leaders, it’s easy to assume they’ll remain on top indefinitely. These companies have massive cash reserves, dominant market positions, and appear to be shaping our technological future. But market history tells a different story.

Consider this statistic from Dimensional Fund Advisers’ analysis: of the 10 largest US companies in 1980, only three made it to the top 10 by 2000.[1] Even more striking, none of those 1980 giants appears in today’s top 10. Companies like IBM, AT&T, and Exxon – once considered unassailable titans – have been replaced by an entirely new generation of market leaders.

Source: Dimensional - Click for full information

This is more than trivia; it’s a fundamental lesson about impermanent market dynamics that should inform every portfolio decision.

Research from the Centre for Research in Security Prices demonstrates that market leadership is far more transient than most investors realise: In 1980, six of the 10 largest companies were energy firms.[1] Today, technology dominates. This wasn’t gradual. It was a wholesale transformation driven by innovation and shifting economic fundamentals.

This pattern should concern anyone betting that today’s technology concentration will last for decades. Seemingly unstoppable industries may face disruption from sources we cannot yet imagine.

Technological advancement doesn’t benefit only technology companies. Throughout history, firms across all industries have leveraged new technologies to innovate and grow. The internet didn’t just create wealth for internet companies; it transformed retail, finance, healthcare, and virtually every sector.

Similarly, McKinsey research suggests AI adoption could add trillions in value across all economic sectors, not just technology.[2] A pharmaceutical company using AI for drug discovery or a manufacturer deploying advanced robotics may deliver returns that rival pure-play tech stocks – anything is possible at this stage.

The Case for Diversification

Modern Portfolio Theory, developed by Nobel laureate Harry Markowitz, demonstrates that diversification is the only “free lunch” in investing – it reduces risk without necessarily sacrificing returns.[3]

Diversification doesn’t mean avoiding the Magnificent 7 per se. These companies earn their market positions through genuine competitive advantages. It does mean resisting the temptation to overweight them simply because they’ve performed well recently. A diversified portfolio allows participation in current market leaders while maintaining exposure to companies and sectors that may emerge as tomorrow’s giants.

Remember, many of today’s Magnificent 7 were relatively small or didn’t exist 25 years ago. The next generation of market leaders is likely being built right now.

Working with a financial adviser can help you recognise and combat recency bias – this is the tendency to assume recent trends will continue indefinitely. Behavioural finance research shows this cognitive bias often leads to poor investment decisions.[4] And as any adviser worth their salt will be able to tell you, the Magnificent 7’s impressive performance creates a psychological pull to buy more of these stocks – but this often means buying high and taking concentrated risk precisely when valuations are stretched.

Instead of chasing performance, you need to stay focused on your long-term goals. Maintaining discipline around portfolio construction through regular rebalancing forces you to trim any areas that have grown over-large, so you (or rather, your financial adviser) can redeploy capital to areas that may offer better prospective returns.[5]

The Path Forward

Market history doesn’t repeat itself, but it often rhymes. While predicting which companies will lead markets in 2040 or 2050 is impossible, the leaders of the pack will certainly change. New technologies, business models, and companies will emerge, and the current leaders may become footnotes in global markets history.

A globally diversified portfolio positions you to benefit from these changes, rather than being hurt by them. They participate in today’s success stories while remaining open to tomorrow’s opportunities.

The Magnificent 7 have earned their place among America’s largest companies through innovation and execution. But despite how tempting they are, the best course of action isn’t to chase yesterday’s winners or follow the herd – it’s to build resilient portfolios that serve your unique needs.

Building a plan that can weather change (while capturing opportunity wherever it emerges) requires diversification, discipline, and a healthy respect for the lessons of market history. If that sounds daunting, try arranging a chat with your local, fiduciary financial adviser to discuss what your first steps might be – it’s a better use of your time than tracking Magnificent 7 performance, anyway.

Nick Stewart
(Ngāi Tahu, Ngāti Huirapa, Ngāti Māmoe, Ngāti Waitaha)

Financial Adviser and CEO at Stewart Group

• Stewart Group is a Hawke's Bay and Wellington based CEFEX & BCorp certified financial planning and advisory firm providing personal fiduciary services, Wealth Management, Risk Insurance & KiwiSaver scheme solutions.

• The information provided, or any opinions expressed in this article, are of a general nature only and should not be construed or relied on as a recommendation to invest in a financial product or class of financial products. You should seek financial advice specific to your circumstances from a Financial Adviser before making any financial decisions. A disclosure statement can be obtained free of charge by calling 0800 878 961 or visit our website, www.stewartgroup.co.nz

• Article no. 429

---

References

1. Dimensional Fund Advisers. (2024). “Will the Magnificent 7 Stay on Top?” *Dimensional Quick Take*, using data from the Centre for Research in Security Prices (CRSP) and Compustat, University of Chicago.

2. McKinsey Global Institute. (2023). “The Economic Potential of Generative AI: The Next Productivity Frontier.” McKinsey & Company.

3. Markowitz, H. (1952). “Portfolio Selection.” *The Journal of Finance*, 7(1), 77-91.

4. Kahneman, D., & Tversky, A. (1979). “Prospect Theory: An Analysis of Decision under Risk.” *Econometrica*, 47(2), 263-291.

5. Buetow, G. W., Sellers, R., Trotter, D., Hunt, E., & Whipple Jr, W. A. (2002). “The Benefits of Rebalancing.” *Journal of Portfolio Management*, 28(2), 23-32.

When Geniuses Get Burned: A Timely Lesson on Bubbles, Diversification, and the Perils of FOMO

On a crisp morning stroll through Edinburgh recently, whilst following my son’s rugby team in the UK, I found myself at the Scottish National Gallery of Modern Art, where Eduardo Paolozzi’s 1989 statue of Sir Isaac Newton caught my eye. Cast in bronze with geometric fragments, Newton is depicted as the “Master of the Universe,” his head bowed intently over mathematical instruments. It’s a mesmerising tribute to one of history’s greatest intellects, immortalised in deep contemplation of the cosmos.

But statues don’t tell the full story. What Paolozzi’s work omits is Newton’s humiliating financial debacle during the South Sea Bubble of 1720-a cautionary tale that resonates profoundly in today’s volatile markets. Historical accounts reveal that Newton initially invested a modest sum in South Sea Company stock, cashed out with a respectable profit, then watched enviously as his friends amassed fortunes while prices skyrocketed. Succumbing to the fear of missing out (FOMO), he re-entered the market near its peak with a much larger stake [1]. When the bubble inevitably burst, Newton lost approximately £ 20,000, equivalent to about £6 million today (adjusted for inflation), or roughly $14 million in New Zealand dollars [2]. His wry reflection afterwards? “I can calculate the motions of heavenly bodies, but not the madness of people” [3].

This episode isn’t just an amusing footnote in the life of a scientific giant; it’s a stark reminder that even the sharpest minds are vulnerable to market mania. If Newton, the architect of calculus and gravity, couldn’t outsmart the crowd, what hope do everyday investors have in navigating today’s hype-driven landscapes, like the AI boom?

Unpacking the Bubble Phenomenon

Financial bubbles are seductive traps, identifiable only after they’ve popped. They thrive on compelling narratives that mask underlying risks. In 1720, the South Sea Company’s promise of exclusive trade rights with South America fuelled wild speculation, driving stock prices from around £100 to over £1,000 in months before collapsing [4]. Closer to home, New Zealand’s 1987 sharemarket crash serves as a vivid parallel: fuelled by deregulation and easy credit, the NZSE index surged, only to plummet 60% in weeks, wiping out leveraged fortunes in property and equities [5, 11]. The aftermath was brutal: bankruptcies, shattered families, and a lingering distrust of markets that scarred a generation.

More recently, Auckland’s property market exhibited bubble characteristics, with median house prices tripling between 2011 and 2021 amid low interest rates and high demand [6]. These episodes highlight a pattern: euphoria driven by “this time it’s different” optimism, followed by inevitable reversion to fundamentals.

Enter today’s hottest debate: artificial intelligence. Is AI the next fire, wheel, or microchip-a paradigm shift revolutionising healthcare, agriculture, and beyond? Or is it overhyped, with valuations echoing the dotcom bubble, where slapping “.com” on a business sent stocks soaring regardless of viability [7]? Companies like Nvidia have seen shares rocket over 100% in the past year on AI enthusiasm, but sceptics warn of irrational exuberance. The truth? No one knows for sure. AI could deliver transformative value, or it might follow the path of past tech fads, leaving late entrants holding the bag.

Why Diversification is Your Best Defence

In the face of such uncertainty, diversification emerges not as a conservative cop-out, but as a strategic imperative. When predicting individual winners is near-impossible, the smart play is to spread your bets across the market. Own a broad index fund, and let capitalism’s machinery-competition, innovation, and resource allocation-work its magic over the long haul.

Strolling Edinburgh’s Royal Mile, I paused at the statue of Adam Smith, the Scottish economist whose 1776 masterpiece, The Wealth of Nations, introduced the “invisible hand” [8]. Smith argued that self-interested individuals, through free markets, inadvertently create societal benefits by directing capital to its most productive uses. No top-down planning required-just the aggregate wisdom of millions of decisions fostering efficiency and growth.

This evolutionary aspect of capitalism is key: viable companies flourish, while hype-driven ones wither. Yet spotting them in advance is a fool’s errand. Studies show that even seasoned fund managers underperform broad market indices over time, with survivorship bias and fees eroding returns [9]. For individual investors chasing the next Amazon or dodging the next Enron, the odds are stacked even higher against success.

New Zealanders have ample tools for diversification: local or global index funds covering thousands of companies, often accessible via platforms like KiwiSaver. These vehicles ensure you participate in growth sectors like AI without overexposure. Miss the ground-floor entry on Nvidia? No problem-a diversified portfolio still captures the upside while shielding you from sector-specific crashes.

The Psychology of Smart People Making Dumb Moves

Newton’s misadventure underscores a timeless truth: raw intelligence offers no immunity to behavioural biases. As Daniel Kahneman explains in Thinking, Fast and Slow, our brains are wired for quick, intuitive decisions that often lead us astray in complex environments [10]. Newton fell victim to a classic cycle: initial caution (fear of loss), sidelined envy (FOMO), and impulsive greed fuelled by social proof from his peers.

This dynamic played out vividly in New Zealand’s 1987 crash. Professionals-doctors, lawyers, accountants-piled into “can’t-lose” investments with borrowed money, convinced by the herd that prices would rise forever. When reality hit, the rapid 60% drop erased wealth overnight, triggering a cascade of personal and economic fallout [11].

Human nature hasn’t evolved since Newton’s day. Greed, fear, and herd mentality persist, amplified by social media and 24/7 news cycles. In the AI era, viral success stories can lure even savvy investors into concentrated bets, ignoring the risks.

Building Resilience Through Diversification

While diversification won’t eliminate downturns (markets are volatile by nature), it mitigates ruinous losses. Imagine holding only South Sea stock: total devastation. But a basket of British equities? Painful, but survivable, with recovery potential. The MSCI World Index’s ~8% average annual gross return over 30 years, weathering multiple crashes, exemplifies this resilience [9].

Apply this to AI: if it revolutionises society, diversified holders benefit via broad tech exposure. If it fizzles, your portfolio’s other sectors (healthcare, consumer goods, energy) provide ballast [12]. The key is discipline: resist the siren call of hot tips and maintain a balanced allocation.

Final Reflections: Wisdom from the Past

Gazing at Newton’s statue, the irony hit me: a monument to unparalleled genius, yet its subject was felled by the same primal instincts that plague us all. Bubbles will recur because human psychology is immutable. But we can arm ourselves with humility, acknowledging our limitations in outguessing markets.

Embrace diversification as your anchor, harnessing capitalism’s long-term compounding power. You don’t need Newton-level brilliance to thrive financially-often, recognising your non-genius status is the cleverest strategy.

And don’t go it alone. Newton might have avoided disaster with impartial advice. A trusted financial adviser won’t forecast the next bubble but will enforce discipline: reminding you that past performance doesn’t predict future results, crowds are often wrong, and capital preservation trumps speculative gains. They’ll tailor a diversified plan to your goals, helping you navigate emotional turbulence and emerge stronger.

In an unpredictable world, this approach turns potential pitfalls into opportunities. Review your portfolio today: is it diversified enough to withstand the next mania? If not, seek wise counsel-it could be the difference between exiting happy and exiting broke.

Nick Stewart
(Ngāi Tahu, Ngāti Huirapa, Ngāti Māmoe, Ngāti Waitaha)

Financial Adviser and CEO at Stewart Group

• Stewart Group is a Hawke's Bay and Wellington based CEFEX & BCorp certified financial planning and advisory firm providing personal fiduciary services, Wealth Management, Risk Insurance & KiwiSaver scheme solutions.

• The information provided, or any opinions expressed in this article, are of a general nature only and should not be construed or relied on as a recommendation to invest in a financial product or class of financial products. You should seek financial advice specific to your circumstances from a Financial Adviser before making any financial decisions. A disclosure statement can be obtained free of charge by calling 0800 878 961 or visit our website, www.stewartgroup.co.nz

• Article no. 428

---

References

1. Odlyzko, A. (2018). Notes and Records: The Royal Society Journal of the History of Science, 73(1), 29-59.

2. UK Office for National Statistics Composite Price Index; Bank of England inflation calculator (1750-2025).

3. Levenson, T. (2009). Newton and the Counterfeiter. Houghton Mifflin Harcourt.

4. Dale, R., et al. (2005). The Economic History Review, 58(2), 233-271.

5. Easton, B. (1997). In Stormy Seas. Otago University Press.

6. Reserve Bank of New Zealand Housing Data Series (2011-2021).

7. Shiller, R. J. (2015). Irrational Exuberance (3rd ed.). Princeton University Press.

8. Smith, A. (1776). Wealth of Nations. W. Strahan and T. Cadell, London.

9. Malkiel, B. G. (2019). A Random Walk Down Wall Street (12th ed.). W. W. Norton & Company.

10. Kahneman, D. (2011). Thinking, Fast and Slow. Farrar, Straus and Giroux.

11. Steeman, M. (2017). Stuff.co.nz, 19 October 2017.

12. Bogle, J. C. (2017). The Little Book of Common Sense Investing (10th Anniversary ed.). John Wiley & Sons.