Why 95% of Investors Can’t Beat the S&P 500 (and What Actually Helps)
Charlie Munger put the odds at roughly 95% against. The data on professionals and individuals points the same way. The reasons are structural, and most of them can be fixed.
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Why the S&P 500 Is Probably the Wrong Benchmark for Your Portfolio
Beating the index can mean you took more risk. Lagging it can mean your portfolio did its job. The fair test is a benchmark built from the same kinds of assets you own.
Key takeaways
- Return without risk is half a number: the S&P 500 is only a fair yardstick if your portfolio looks like the S&P 500.
- Aggressive portfolios can beat the index just by being more volatile, then give it back in a crash.
- Conservative portfolios lag in bull markets by design; judging them against the index pushes people into risk they did not want.
- A risk-matched benchmark replaces each holding with the index fund for its kind of asset, weighted like your portfolio. It shows whether your picks beat the passive version of the same bets.
The scoreboard problem
Ask a self-directed investor how they are doing and you will usually hear a comparison: “I’m beating the S&P” or “I’m behind the market this year.” The S&P 500 has become everyone’s scoreboard. It is a reasonable one for a portfolio that looks like the S&P 500. For everyone else it quietly distorts decisions.
Two investors, one misleading verdict
Consider two illustrative portfolios over the same strong year for stocks:
| Illustrative example | Return | Volatility | Verdict vs. S&P 500 | Verdict vs. risk-matched benchmark |
|---|---|---|---|---|
| Aggressive: concentrated tech and small caps | Higher than the S&P 500 | Much higher | Winning | May be losing |
| Conservative: dividend stocks and bonds | Lower than the S&P 500 | Much lower | Losing | May be winning |
| Illustrative example | Aggressive: concentrated tech and small caps | Conservative: dividend stocks and bonds |
|---|---|---|
| Return | Higher than the S&P 500 | Lower than the S&P 500 |
| Volatility | Much higher | Much lower |
| Verdict vs. S&P 500 | Winning | Losing |
| Verdict vs. risk-matched benchmark | May be losing | May be winning |
Judged against the S&P 500, the first investor feels skilled and the second feels behind, and is tempted to add risk at exactly the wrong time. Judged against a benchmark built from the same kinds of assets, the picture can flip. The aggressive investor may have trailed a plain Nasdaq-100 and small-cap index mix while taking on more volatility; the conservative one may have beaten the passive versions of the dividend stocks and bonds they hold.
Illustrative only, not based on any real account.
What a risk-matched benchmark is
A risk-matched benchmark is your own blend of market indexes: each holding is matched to the index fund for its kind of asset, and weighted the way your portfolio is weighted. It answers one question: if you had made the same bets passively, through cheap index funds, would you have done better or worse?
Typical matches look like this:
| If you own… | It is matched to… |
|---|---|
| Large US tech and growth stocks | Nasdaq-100 (QQQ) |
| Broad US large caps and S&P 500 funds | S&P 500 (SPY) |
| Mid caps / small caps | S&P MidCap 400 (MDY) / Russell 2000 (IWM) |
| Bonds and bond funds | US aggregate bond index (AGG) |
| International stocks | Europe (VGK), Pacific (VPL) or ex-US (VXUS) indexes |
| Crypto | Bitcoin |
Cash is left out on both sides, so the comparison is about your invested money. Then read the result:
- If you beat your benchmark over several years, your picks added value.
- If you match it, your stock picking roughly washed out; the index funds would have done the same for less effort.
- If you lag it, the passive version of your own bets would have served you better.
Compare risk, not just return
Returns alone still hide the risk taken to earn them. Compare your portfolio and its benchmark on several measures, over more than one period:
- Volatility: how much your returns swing. More return for more volatility is not necessarily skill.
- Sharpe ratio: return per unit of volatility. Sortino ratio: return per unit of downside volatility.
- Drawdown: how deep your worst fall was compared with the benchmark’s.
- Time: look at 1, 3 and 5 years. One good year proves little.
How to build one yourself
- List your holdings and their current weights, leaving out cash.
- Match each holding to the index fund for its kind of asset, using the table above as a guide.
- Add up the weights per index fund: that is your benchmark’s mix.
- Calculate the benchmark’s return, volatility and worst drawdown over the same periods as your portfolio’s.
- Compare the two side by side, and repeat when your holdings change.
A simpler shortcut some investors use is a stock-and-bond index mix tuned to the same volatility as their portfolio. It is easier to build, but it compares you with assets you may not own, so the holding-by-holding version is the fairer test.
Why it changes behavior
The wrong benchmark does not just produce a wrong grade. It produces wrong decisions: chasing the index in late bull markets, abandoning a sound conservative plan, or doubling down on a concentrated bet because it is “beating the market”. The right benchmark keeps the question honest: did your choices beat the passive version of the same bets, for the risk you took?
Frequently asked questions
A risk-matched benchmark: the index funds that match each of your holdings (for example Nasdaq-100 for large tech, S&P 500 for broad large caps, aggregate bonds for bonds), weighted like your portfolio. Use the S&P 500 alone only if your portfolio looks like it.
Your own blend of market indexes, with each holding matched to its index and weighted like your portfolio, cash excluded. It shows whether your picks beat the passive version of the same bets.
There is no universal cut-off; it depends on the period. The useful test is relative: is your Sharpe ratio higher than your risk-matched benchmark’s over the same years?
See your risk-matched benchmark.
Exent matches every holding to its index, weighted like your portfolio, and shows whether you beat it, on return, volatility and drawdown.
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Educational content, not investment advice. Examples are illustrative; past performance does not guarantee future results.