There's a statistic I keep coming back to, not because it's clever but because it's humbling. Over a 15-year period, roughly 88 to 92% of actively managed large-cap US funds underperform the S&P 500. These aren't amateurs on Reddit. These are professional fund managers with MBAs, analyst teams, proprietary research, Bloomberg terminals, and direct access to company management. And nine times out of ten, they can't beat a simple index fund that costs 0.07% and requires no decisions at all.
The data comes from the SPIVA scorecard — S&P Indices Versus Active — which has been tracking this for decades. Every year, the story is the same. The overwhelming majority of active managers fail to beat their benchmarks. And the few who do beat the benchmark in any given year aren't the same ones who beat it the next year. It's luck, not skill, dressed up in quarterly letters and performance fees.
So if professionals — with every advantage money can buy — can't consistently beat the market, what chance does an ordinary investor have with a laptop, some evenings and weekends, and a few stock tips from the internet? The answer is, statistically, almost none. That's not an opinion. It's arithmetic.
Warren Buffett famously made a bet with a hedge fund manager in 2007. Buffett bet that a simple S&P 500 index fund would outperform a basket of hedge funds over ten years. The index fund won, and not by a little. Buffett then directed that his own estate be invested 90% in an S&P 500 index fund and 10% in government bonds for his wife after his death. The man widely considered the greatest stock picker in history doesn't think stock picking is the right strategy for his own family after he's gone. I find that worth sitting with.
So why do index funds work so well? There are a few reasons. First, cost. A broad index fund might charge 0.07% a year. An actively managed fund typically charges 0.75% to 1.5% a year, often with additional performance fees. Over 20 or 30 years, that 1% difference doesn't sound like much. But compounded, it turns out to be enormous. On a £100,000 portfolio over 30 years at historical average returns, the difference between 0.07% and 1.00% in fees is literally tens of thousands of pounds — maybe more. The maths is relentless and it works against you every single day.
Second, diversification. An S&P 500 index fund owns 500 companies. A global all-cap index fund owns thousands of companies across dozens of countries. If one company collapses — and they do, regularly — it barely registers. If one country underperforms for a decade — and they do, regularly — you're diversified across others. Individual stock picking concentrates risk in a way that broad index funds simply don't.
Third, behaviour. This is the one that doesn't show up in the cost comparisons but in my experience matters most. When you own a broad index fund, you don't have to decide when to sell. You don't have to decide whether that 20% drop in a single stock is a buying opportunity or a warning sign. You don't have to lie awake wondering whether the CEO's interview on Bloomberg means you should change your position. The index fund just sits there, tracking the market, while you get on with your life. That simplicity has genuine financial value because it prevents you from making expensive emotional decisions.
Now, I should be honest: I do own some individual shares. I've written about them on this site — Meta, Alphabet, Johnson & Johnson, Constellation Energy, a few others. But here's the context that matters: they make up a tiny fraction of my portfolio. The overwhelming majority of my money is in broad ETFs. The individual shares are satellites around a core of index funds, and I approach them as educated bets, not as a strategy. I could lose all of them and my retirement would be fine. That's the only way to hold individual stocks in my view — as small, speculative positions that you're entirely prepared to lose, not as the foundation of your financial future.
There are times when individual stocks can make sense. If you genuinely enjoy the research process — reading annual reports, understanding business models, following industries — and you approach it as an intellectual hobby rather than a get-rich scheme, there's nothing wrong with allocating a small percentage of your portfolio to individual picks. What's dangerous is believing you're one of the 8% who will outperform, when the evidence says almost everyone who believes that is wrong.
I spent 15 years trying to pick winning stocks. Some worked. Most didn't. The ones that worked gave me good stories. The ones that didn't cost me real money. Meanwhile, the index funds I barely thought about kept compounding quietly in the background, and they outperformed my best efforts by a significant margin. The day I accepted that I wasn't in the 8% was one of the most financially valuable days of my life.
For educational purposes only. Nothing here is financial advice. All investing carries risk — index funds can go down as well as up. Past performance doesn't guarantee future results. The SPIVA data describes historical patterns — future results may differ. What I do with my own money is not a recommendation. Always do your own research.