For years, investors have debated whether paying a premium for an active fund manager is worth the cost or if sticking to low-cost index funds is the smarter play. Academic research has long suggested that picking a winner is largely a matter of luck rather than skill, but some clung to the idea of active share as a silver lining. The theory was simple: managers who deviated significantly from their benchmarks showed more conviction and were therefore more likely to beat the market. However, recent data suggests that this window of opportunity hasn’t just closed; it has slammed shut.
New research indicates that any advantage once held by high-conviction managers essentially vanished after 2002, with later studies showing that those taking the biggest swings often ended up with lower returns and higher risks. Rather than providing a path to outperformance, having a high active share has recently been negatively correlated with success. As markets grew more efficient, the elusive alpha that active managers chase seemed to disappear into thin air, leaving many investors paying higher fees for underperforming portfolios.
This decline coincides with a massive structural shift in how people invest. Since 2010, the share of equity assets held in passive vehicles like ETFs and index funds has surged from around 19 percent to over 50 percent. Some theorists argued that this move toward passivity would actually help active managers by creating more mispriced stocks and opportunities for savvy stock-pickers to exploit. Instead, the opposite happened. Evidence shows that active fund underperformance actually doubled during this period, falling from an annual net alpha of negative 0.72 percent before 2010 to negative 1.82 percent thereafter.
The reason for this downturn appears to be rooted in the mechanics of fund flows. When investors pull money out of active funds to move into passive ones, managers are often forced to sell off their most concentrated, off-benchmark positions to meet redemptions. Meanwhile, passive funds automatically buy stocks according to their benchmark weights regardless of price. This creates a destructive cycle where selling pressure hits the very stocks active managers believe in, while buying pressure inflates stocks they avoid. For the modern investor, it means that the tide of passive investing may be making it fundamentally harder for anyone trying to beat the market via traditional active management.
