ETFs became popular because they offered low-cost diversification, instant market exposure, and simple access to broad indexes. The number of publicly traded U.S. companies has declined while the number of U.S.-traded ETFs has risen to roughly 4,900. With more ETFs than stocks, many funds hold overlapping portfolios, so selling pressure can become synchronized. ETFs are not inherently risky, but the surrounding ecosystem has changed, with leveraged, inverse, thematic, and options-based products taking a larger share of trading volume. In downturns, ETF outflows can force funds to sell the same underlying holdings, increasing correlations and pressuring even strong companies. During the March 2020 crash, correlations rose as investors sold index products broadly.
"That concentration creates efficiency during bull markets. As money flows into index funds, the largest stocks receive the largest inflows. The cycle reinforces itself. But concentration also works in reverse. If investors begin pulling money out of ETFs during a downturn, funds do not sell random stocks. They sell the same underlying holdings everyone else owns, too. That can increase correlations across the market and pressure even fundamentally strong companies. Surprisingly, this is not just theoretical. During the March 2020 pandemic crash, correlations between stocks surged as investors sold index products broadly instead of evaluating companies individually."
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