Bond investors are losing their aversion to difficult-to-trade corporate debt that handed them some of the biggest losses in the credit crisis.

The extra yield note buyers demand to own older, smaller junk bonds that trade infrequently has shrunk to an average 0.25 percentage point this month from more than 1 percentage point a year ago, according to Barclays Plc data. JPMorgan Chase & Co. money manager Jim Shanahan said he’s preferring “good credit quality and less liquidity” when picking bonds, while Howard Marks, the head of distressed debt investor Oaktree Capital Group LLC, said he’s finding bigger potential gains in private, less-traded debt.