Why Active Managers Are Mimicking the Flaw of Passive Benchmarks

Why It Matters

When active funds merely replicate passive biases, they lose their value proposition, reducing investors' chances of earning true outperformance and pressuring fee structures.

Key Takeaways

• Active funds mimic passive momentum bias.
• High turnover replaces genuine research.
• True active management needs long‑term structural focus.
• Only 5‑6 AI firms will drive disproportionate growth.
• Differentiated ideas, not trade frequency, create alpha.

Pulse Analysis

The past decade has seen passive indexing capture a growing share of U.S. large‑cap assets, driven largely by the outsized performance of the so‑called Magnificent Seven. As a result, active managers have been under relentless pressure to justify higher fees by delivering consistent outperformance. Yet many funds have responded by tightening their portfolios around the same high‑beta, momentum‑laden stocks that dominate the benchmarks, effectively turning active strategies into passive replicas. This convergence erodes the core differentiation that investors expect from active stewardship and raises questions about the sustainability of the active‑management model.

Aziz Hamzaogullari of Loomis Sayles argues that the problem is not the concept of active management but its execution. He contends that genuine active investing requires a long‑term, structural lens rather than frequent trading and turnover. By focusing on the quality of ideas—identifying a handful of companies with durable competitive advantages—managers can avoid the price‑weighted, momentum bias baked into market indices. Hamzaogullari points to the AI wave as a case in point: only five to six firms are likely to capture the bulk of growth, while the rest will lag.

For investors, the shift toward benchmark‑mimicking tactics signals a potential decline in alpha generation and may prompt a re‑evaluation of fee structures. Asset owners seeking true outperformance must scrutinize a manager’s turnover rates, research depth, and commitment to a differentiated investment thesis. Meanwhile, active firms that double down on low‑turnover, idea‑centric processes stand to regain credibility and attract capital seeking long‑term growth exposure. As the market continues to reward a narrow set of mega‑caps, the ability to isolate genuine, high‑conviction opportunities will become the decisive edge for active managers.