Why the world's most famous passive index is actually driven by active human judgment
Passive investing is often viewed as a set-it-and-forget-it strategy, but the S&P 500 is governed by a committee that makes active, discretionary choices. As market volatility rises, index overseers are weighing the removal of over 30 companies, proving that even the most automated portfolios rely on human intervention.
The S&P 500 is widely regarded as the benchmark for passive investing, yet its composition is far from static. While the index follows specific rules, the S&P committee retains the authority to exercise human judgment, especially during periods of extreme market turbulence. This committee must determine whether a company's decline is a temporary setback or a permanent impairment. Crucially, simply falling below market capitalization thresholds is not sufficient grounds for immediate removal; the committee actively seeks to minimize turnover while ensuring the index remains representative of the broader market.
The criteria for maintaining membership in the S&P 500 are distinct from those required for initial inclusion. A company must meet strict standards, including a market capitalization of at least $8.2 billion, sufficient liquidity, and positive earnings over the previous four quarters. However, as of early 2020, approximately one-fifth of the companies currently in the index no longer meet the $8.2 billion market-cap threshold, which was last adjusted in February 2019. The committee faces a delicate balancing act: they are hesitant to further concentrate the index in the technology sector, which already accounts for 26% of the total weight—a level not seen since the dot-com era.
Over the last three years, nearly 50 companies have been removed from the index, primarily from the retail, industrial, and energy sectors. This churn has inadvertently benefited passive investors, as the basket of deleted firms has significantly underperformed the broader market, dropping 47% in 2020 alone. If the committee proceeds with the potential removal of more than 30 additional firms, it would mark one of the busiest years for index turnover in three decades. This ongoing reshuffling highlights that even the most passive investment vehicles contain active, managed elements designed to protect the integrity of the benchmark.
Source: More than 30 stocks might be removed from the S&P 500 | Index Adds and Deletes | Passive Investing
