The International Monetary Fund has published an analysis of how exchange-traded fund (ETF) and open-ended mutual fund investor types relate to volatility in the U.S. corporate bond market. Aggregate ETF ownership was associated with lower bond return volatility, but the result varied sharply by investor base. A 1 percentage point increase in a bond’s outstanding value held by institutional ETF investors was associated with a 27 basis point increase in annualized return volatility, while the same increase in retail ETF ownership was associated with an 85 basis point decrease. No comparable divergence was evident between institutional and retail open-ended mutual fund investors. The gap between institutional and retail ETF holdings became more pronounced during periods of elevated market stress, when institutional ETF ownership was associated with sizable adverse effects on volatility. The IMF noted that policymakers assessing fund-related financial stability risks should consider how investment vehicle structures attract different investor groups, as regulatory changes to those structures could reallocate investors and shift vulnerabilities rather than eliminate them.
2025-03-12International Monetary Fund
International Monetary Fund finds institutional ETF ownership associated with higher corporate bond volatility
The International Monetary Fund found that aggregate ETF ownership was associated with lower U.S. corporate bond volatility, but institutional ETF ownership was linked to higher volatility, particularly during market stress. Retail ETF ownership was associated with lower volatility, while open-ended mutual funds showed no comparable institutional-retail divide.