Capital Allocators – Inside the Institutional Investment Industry WTT: When the Benchmark Becomes a Bet
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Mar 19, 2026 Discussion of how the S&P 500’s changing composition has turned a benchmark into a concentrated bet on a few big tech names. Exploration of why beating the index has become unusually difficult, from passive flows to index concentration. Examination of governance and career risks that keep allocators tied to the benchmark. Consideration of whether portfolio construction and diversification need to be rethought.
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S&P 500 Is Now A Concentrated Bet
- The S&P 500 no longer provides neutral, broad-based exposure to the U.S. economy.
- Its composition is highly concentrated in a few tech leaders closely tied to AI, turning passive indexing into an implicit concentrated bet.
Active Management Performance Has Deteriorated
- Active managers have performed worse over recent periods, with only 10% beating U.S. equity benchmarks over 3, 5, and 10 years per the 2024 SPIVA scorecard.
- The last 15 years saw managers beat the index rarely and average underperformance has increased in the past decade.
Why Active Managers Are Losing So Badly
- Three possible causes for active underperformance are costs, the paradox of skill, and the index itself winning via active-like concentration.
- Ted argues costs are lower, paradox of skill is insufficient, leaving index concentration as the likely driver.