Do Companies Pay For S&P Index Membership?

Episode Summary

Executive Summary: The episode examines how passive index investing transformed markets, focusing on the S&P 500’s outsized influence, the discretion used in index membership decisions, and a recent paper suggesting S&P Global’s ratings business may affect inclusion odds. It argues that index entry creates only short-lived price pops, while raising concerns about distorted capital allocation and corporate incentives.

Main Topics: Rise of passive index investing (Priority: 5/5): Explains how index funds replaced stock-picking for many investors and became a dominant force, with passive funds now holding enormous assets and major companies relying on them as stable shareholders. How stock indices evolved (Priority: 4/5): Describes the original informational purpose of early indexes like the Dow Jones Transportation Index and how modern indexes became investment products rather than mere market indicators. S&P 500 membership and discretion (Priority: 5/5): Shows that inclusion is not purely rule-based: S&P uses judgment in additions and deletions, sometimes overriding published criteria to avoid disruption or to reflect broader considerations. Potential conflicts of interest at S&P Global (Priority: 5/5): Summarizes the NBER working paper claiming that firms buying S&P bond ratings are more likely to be added to the S&P 500, suggesting possible strategic behavior around index selection. Economic effects of index inclusion (Priority: 4/5): Covers research finding that S&P 500 inclusion causes temporary price increases but no lasting valuation premium, implying the effect is driven by liquidity and rebalancing rather than fundamentals. Concerns about misallocation and corporate behavior (Priority: 4/5): Discusses critiques that passive dominance weakens market signals and may encourage weaker firms to gain index entry, potentially harming profitability and return on assets after inclusion.

Key Arguments: Passive investing now dominates U.S. equity ownership, making index funds major shareholders in many large companies. Unlike active managers, passive funds do not evaluate fundamentals; they track index composition mechanically and rely on prices set by active investors. The S&P 500 is not purely rule-driven; S&P applies discretion in both adds and deletes, sometimes ignoring strict criteria. A recent academic paper claims firms buying S&P bond ratings have a higher chance of entering the S&P 500, implying a possible indirect incentive to buy services from the index provider. The paper argues that published criteria explain only a minority of additions, suggesting substantial discretion in selection. Companies admitted to the S&P 500 may underperform afterward, with lower profitability and ROA, raising concerns about capital misallocation. Index inclusion produces only a temporary price effect; long-run valuation depends more on business fundamentals than index membership. Executives should not over-optimize around index inclusion because any valuation boost is transient. S&P’s discretion may reduce unnecessary turnover and trading costs, but it also creates room for perceived favoritism or conflicts of interest.

Data Points: Assets in index funds: around $11 trillion - Amount invested in index funds today, up sharply from a decade earlier. Assets in index funds a decade ago: around $2 trillion - Historical comparison showing rapid growth in passive investing. Passive vs active investing in the U.S.: Since 2019, more money is invested in passive index funds than actively managed funds - Marks a structural shift in U.S. equity investing. Dow Jones Transportation Index age: 137 years ago - Referenced as the first stock market index originally used for informational purposes. GE tenure in the Dow Jones Industrial Average: 122 years - General Electric was a long-standing component before removal in 2018. S&P 500 stock count: 505 different stocks - Because five component companies have two share classes included. Potential entrants for the S&P 500: over 100 companies - The episode says there are often many eligible candidates when S&P selects additions. Paper’s explanation of current S&P positions: about 62% - Published criteria justify this share of index members during the studied period. Paper’s explanation of S&P additions: about 3% - Published criteria justify only a small fraction of additions. Profitability after entry: 14.6% drop - Average decline in profitability over four years after entry versus similar excluded firms. Return on assets after entry: 37% decline - Average ROA decline over four years after entry versus similar excluded firms. Investment after entry: 13% more - Included firms invest more in the two years after entry. McKinsey sample size: 1,032 US-listed stocks - Used to study longer-term S&P 500 inclusion effects. Post-inclusion price effect duration: 45 days - Excess return after S&P 500 inclusion disappears within about 45 days. Statistically significant positive return duration: 20 days - The positive return effect fades even sooner on a significance basis. Post-deletion price pressure duration: 40 to 50 days - Price effects after removal from the S&P 500 fade within this window. Morningstar SEC settlement: $3.5 million - Mentioned as an example of conflict-of-interest scrutiny in ratings businesses.

Pivotal Quotes: "Analysts at Bernstein have called passive investing worse than Marxism." — Narrator: Introduces the intensity of criticism directed at passive investing and index dominance. "The published criteria justify only about 62% of the index members' positions during the period studied and just 3% of additions." — Narrator: Summarizes the working paper’s claim that S&P’s membership decisions rely heavily on discretion. "There was no permanent price premium for companies that had been added to the SP." — Narrator: States the McKinsey finding that index inclusion does not create lasting valuation gains.

Implications: Index membership can influence prices temporarily, but long-term value still depends on business fundamentals. The episode suggests regulators, investors, and companies should watch for discretion and conflicts in index-provider decisions.