Does ownership concentration affect corporate bond volatility? Evidence from bond mutual funds

This paper examines the link between ownership concentration and corporate bond volatility. We show that more concentrated mutual fund ownership is associated with higher volatility of corporate bonds. This relation is stronger among more illiquid bonds, during periods of heightened bond market illiquidity, and among bonds held by corporate bond funds that invest in more illiquid bonds and experience higher or more correlated liquidity shocks. Using a sample of mutual fund mergers, we further show that increases in bond volatility are unlikely to be driven entirely by the endogenous ownership structure of corporate bonds. Our findings suggest that the concentrated ownership by corporate bond mutual funds provides another channel, apart from illiquidity, to help explain the excess volatility in corporate bonds.