Active vs Passive Investing: Why Active Managers Keep Losing

The Numbers Don't Lie: Active Investing's Long Losing Streak

In 1960, nearly every dollar in the US stock market was actively managed. Professional fund managers picked stocks, timed markets, and charged handsomely for the privilege. By 2024, active investing's share of the market had collapsed from roughly 95% to around 35%. That isn't a blip. That's a structural verdict — delivered not by academics, but by investors voting with their capital.

The case against active investing isn't built on ideology. It's built on data accumulated over six decades, across every asset class, every geography, and every market condition. And the conclusion is remarkably consistent: the average active money manager underperforms a simple index fund by approximately 1.5% to 2% per year. Compounded over decades, that gap is the difference between a comfortable retirement and a disappointing one.

This article breaks down what the evidence actually shows, why the underperformance persists, and what it means for anyone deciding whether to pick stocks — or simply buy the market.

---

Individual Investors: The Uncomfortable Starting Point

Before examining professional fund managers, it's worth asking whether ordinary investors fare any better. The short answer: they don't — and the more actively they trade, the worse it gets.

A landmark series of studies by Brad Barber and Terrance Odean, analysing tens of thousands of brokerage accounts throughout the 1990s, found that individual investors who traded most frequently earned annual returns roughly 6.5 percentage points lower than buy-and-hold investors. Transaction costs, emotional decision-making, and a tendency to buy high and sell low all compound the damage.

The rise of social media and investment clubs hasn't improved outcomes either. Pooling individual investors — whether in a 1990s investment club or a 2020s Reddit thread — doesn't yield better collective returns. The behavioural biases travel with the crowd.

That said, there is a narrow sliver of individual investors who do beat the market consistently. What they share:

• They stay local. They invest in businesses and industries they genuinely understand — a competitive edge most people overlook.
• They concentrate. The top 10% of individual traders outperform the bottom 10% by a substantial margin. Winners tend to win big and stay focused.
• They trade less. Counterintuitively, the best individual investors often look more like passive investors in their behaviour, even when they're actively selecting stocks.

Whether this outperformance reflects skill or luck is genuinely hard to disentangle. In a market with millions of participants, some will beat it by chance alone — the statistical equivalent of flipping heads ten times in a row. The honest answer is: we don't know for certain. But the existence of consistent outperformers is at least a reason not to dismiss active investing entirely at the individual level.

---

The Jensen Study: Where the Professional Track Record Begins

The most important early data point on active investing came from Michael Jensen in the late 1960s. At a time when the conventional wisdom firmly held that professional money managers — with their superior information, better tools, and full-time focus — must deliver superior returns, Jensen studied more than 120 US mutual funds and asked a simple question: how much did the average fund manager beat the market by?

His answer dismantled the conventional wisdom. Around 60% to 70% of mutual fund managers underperformed the market. The average underperformance, after adjusting for risk, was approximately 1% to 1.5% per year. Jensen called this risk-adjusted measure alpha — and what he found was that most active managers were generating negative alpha.

The term stuck. Today, generating positive alpha remains the stated goal of every active fund manager on the planet. The irony is that most of them don't achieve it.

Jensen's critics at the time argued his model was flawed — specifically, that using the Capital Asset Pricing Model (CAPM) to estimate expected returns might be distorting the results. It was a fair methodological challenge. But over the following four decades, researchers applied every risk model available — the Sharpe ratio, Treynor measure, Arbitrage Pricing Theory, multi-factor models — and arrived at the same destination: active managers underperform.

---

The Carhart Four-Factor Model and Survivor Bias

By the 1990s, researchers had introduced a more sophisticated challenge to Jensen's findings. Small-cap stocks and low price-to-book stocks had historically outperformed — not necessarily because of superior stock-picking, but because of structural market anomalies. A fund manager who simply tilted toward these factors could appear to beat the market without actually demonstrating skill.

Mark Carhart's 1997 study addressed this directly. Using a four-factor model that controlled for market beta, company size, price-to-book ratio, and price momentum, he concluded that the average mutual fund manager underperformed the market by approximately 1.8% per year. Remove the easy factor tilts, and performance got worse, not better.

Carhart also tackled a subtler problem: survivorship bias. Studies that only look at funds still operating today systematically exclude the worst performers — because bad funds get shut down or merged away. His data showed that approximately 3.6% of mutual funds ceased to exist each year, and these were disproportionately the weakest performers. Ignoring this bias overstated fund performance by roughly 0.17% annually — a modest number on its own, but one that tilts an already unflattering picture further in the wrong direction.

In the hedge fund world, the survivorship problem is far more severe. Hedge fund attrition rates are significantly higher than mutual funds, and the funds that disappear tend to do so after catastrophic losses. Any analysis of hedge fund returns that doesn't account for dead funds is, almost by definition, misleading.

---

Style, Geography, and the SPIVA Data: No Safe Harbour

One of the most persistent arguments from active managers is that the aggregate numbers obscure pockets of consistent outperformance. Perhaps large-cap growth managers struggle, but small-cap value managers — operating in less efficient corners of the market — consistently add value?

The S&P Dow Jones Indices SPIVA (S&P Indices Versus Active) report has been tracking this question rigorously for over two decades. It compares active managers not to a generic benchmark, but to the style-specific index that most closely matches their mandate. A small-cap value manager is compared to a small-cap value index. There's nowhere to hide.

The results across style categories are stark:

• Large-cap blend funds: Over 85% underperform the S&P 500 over a 10-year period
• Large-cap growth funds: Approximately 93% underperform their benchmark over 10 years
• Small-cap funds: Marginally better odds in individual years, but across a decade, the index wins
• Bond funds: Short-term, long-term, government, corporate — every slice of active bond management underperforms equivalent bond indices

SPIVA has extended this analysis globally, and the international picture tells essentially the same story. In most regions — Europe, Asia-Pacific, Latin America, Canada — more than 80% of active managers underperform their local index over a 10-year horizon. The two partial exceptions are South Africa and parts of the Middle East, where active managers have occasionally beaten benchmarks over shorter time frames. But even in these markets, the 10-year data swings decisively toward passive.

The logic behind hoping that emerging or less-efficient markets would favour active managers is intuitive: if information is harder to get, and fewer sophisticated investors are competing, skilled managers should have an edge. The evidence suggests this edge either doesn't exist or is competed away faster than the theory predicts.

---

Why Active Investing Keeps Underperforming: The Structural Reality

The persistence of active underperformance isn't a mystery once you understand the mechanics. Several forces work against active managers simultaneously:

1. Costs compound relentlessly. The average actively managed equity fund charges between 0.5% and 1.5% in annual fees. An index fund charges 0.03% to 0.20%. Before a single stock-picking decision is made, the active manager starts every year behind by that margin. Over 30 years, a 1% annual fee drag reduces a portfolio's terminal value by roughly 26% relative to a fee-free alternative.

2. Active investing is a zero-sum game before costs. For every active manager who outperforms, another must underperform — the index is simply the average of all participants. After costs, the average active investor must underperform by the amount of those costs. This isn't a controversial claim; it's arithmetic, articulated clearly by Jack Bogle and later formalised by William Sharpe.

3. The competition has intensified dramatically. In the 1960s, when Jensen ran his study, institutional investors — pension funds, insurance companies, mutual funds — accounted for a relatively small share of market trading. Individual retail investors, many of them unsophisticated, made up a much larger portion. Today, the market is dominated by professionals competing against other professionals. Finding an edge is harder when your counterparty is equally well-resourced.

4. Information advantages have eroded. Regulatory changes — Regulation FD in the US, MiFID II in Europe — have forced companies to disclose material information simultaneously to all investors, rather than selectively to favoured analysts. The informational edge that professional managers theoretically held in the 1960s has been systematically dismantled.

---

What This Means for Your Portfolio

The evidence doesn't necessarily mean active investing is irrational for every investor in every circumstance. But it does mean the burden of proof is firmly on the active side. Before allocating capital to any actively managed fund, investors should ask:

• What is the all-in cost? Management fees, transaction costs, tax drag from frequent trading — the total cost is often higher than the headline expense ratio suggests.
• Has the manager demonstrated genuine alpha, net of fees, over a full market cycle? Three to five years of outperformance in a bull market proves little. Ten-plus years across varying conditions is far more meaningful.
• Is the fund small enough to remain nimble? Large funds face a structural disadvantage — buying or selling meaningful positions moves the market against them, a problem index funds don't have.
• Does the manager have a clearly articulated, differentiated process? Vague references to "rigorous fundamental research" are not a competitive advantage. A specific, repeatable edge — in information, analysis, or patience — is far rarer than fund marketing materials suggest.

For most investors — including many ambitious professionals who follow markets closely — the data makes a compelling case for a core portfolio anchored in low-cost index funds, with any active allocation treated as a satellite rather than the engine of returns.

The market has been delivering this verdict for 40 years. The shift from 95% active to 35% active isn't driven by passive investors being lazy or uninformed. It's driven by investors reading the evidence and acting on it.

---

Frequently Asked Questions

What percentage of active fund managers beat the index over the long term?

The data is consistent and sobering. According to SPIVA reports, over a 10-year horizon, more than 85% of large-cap active equity managers in the US underperform the S&P 500. In some style categories — large-cap growth, for example — the figure approaches or exceeds 90%. Over longer periods (15–20 years), the underperformance rate is even higher, as compounding costs and survivorship effects accumulate.

Is passive investing always better than active investing?

The evidence strongly favours passive investing for most investors in most circumstances, particularly in large, liquid, well-researched markets like US equities. However, "always" is too absolute. There are narrow contexts — certain alternative asset classes, highly illiquid private markets, or genuinely inefficient niches — where skilled active management may add value. The key word is "may". The default assumption, supported by decades of data, should be scepticism toward active management claims until evidence of consistent, fee-adjusted outperformance is demonstrated.

What is Jensen's alpha and why does it matter?

Jensen's alpha, developed by economist Michael Jensen in the late 1960s, measures how much a fund manager earns above or below what would be expected given the level of risk taken. An alpha of zero means the manager earned exactly what the market risk justified. A positive alpha suggests genuine skill-based outperformance; a negative alpha — which most active managers produce — means they delivered less return than a passive approach with equivalent risk would have provided. Alpha remains the central measure of active management quality today.

What is survivorship bias and how does it affect fund performance data?

Survivor bias occurs when analyses of fund performance only include funds that are still operating, ignoring those that were closed or merged — typically because they performed poorly. This systematically overstates the average performance of active funds, because the worst performers are removed from the dataset. Research by Mark Carhart estimated that survivorship bias inflated measured mutual fund returns by approximately 0.17% per year in his sample period. In the hedge fund industry, where closure rates are significantly higher, the distortion is considerably larger. Any fund performance comparison that doesn't account for dead funds should be treated with caution.

---

This article is for informational purposes only and does not constitute financial advice. Always consult a qualified financial professional before making investment decisions.