We explore the link between mutual funds and fragility risk in the corporate bond market. We classify a fund’s trading style based on its responses to signals of large dealer inventories. Trading style is persistent and the majority of funds demand liquidity. Notably, a subset of funds earn positive alpha by intentionally supplying liquidity during periods of sustained customer selling (with transitory price effects). Liquidity-supplying funds maintain their relative trading style when facing large outflows and elevated market stress, thus alleviating fragility risk. Our results add nuance to existing evidence that mutual funds pose a threat to market stability.

Using detailed order handling data, we find that institutional brokers who route more orders to affiliated alternative trading systems (ATSs) are associated with lower execution quality (i.e., lower fill rates and higher implementation shortfall costs). To separate clients’ preference for ATSs from brokers’ routing decisions, we confirm these results for orders where brokers have more order handling discretion, matched broker analysis that accounts for ATS usage, matched child orders that account for client intent, and based on an exogenous constraint on ATS venue choice. Our results suggest that increased transparency of order routing practices will improve execution quality.