Research.LeutholdGroup

Style investors recently witnessed a rare event when, on February 13^th, the P/E ratio of the S&P 500 Growth Index fell below that of the S&P 500 Value Index. At first glance, it is tempting to attribute this valuation flip-flop to the 2022 bear market, which saw Value outperform Growth by a whopping 24.2%. However, the bear-induced collapse of Growth stock prices in 2022 only served to return the P/E spread to a level just below its historical median of 5.1, meaning that the final move toward parity was caused by a force outside the market itself. That “something else” was the S&P 500 style reconstitution that occurs annually on the third Friday of December.

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S&P rebalanced its style indexes in December, and the shuffle caused substantial turnover. The Value index now includes a sizeable swath of mega-cap tech companies, and this changing membership significantly affects the relative valuation metrics that defined those styles.

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In the past we’ve made the observation that adding/deleting stocks to/from a popular index can have a profound impact on the target stocks’ short-term trading volume and performance.

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