In the U.S. Navy in the 1950s, Dan Fuss learned a maxim he still finds useful to this day while navigating pandemic markets: “Don’t sail close to the reef unless you have to.”

It’s why the legendary bond investor and former Navy signal officer remains wary of collateralized loan obligations even as prices start to recover. The bonds, which pool loans to many small, private borrowers, are not far from the lingering malaise on Main Street.

In an interview, the 86-year-old vice chairman of Boston-based Loomis Sayles & Co. said he’s keeping his funds as liquid as possible, favoring Treasuries and investment-grade rated corporate bonds.

“Default odds are rising as more small and mid-sized businesses close down,” Fuss said. “I don’t think current prices reflect this. We don’t own any CLOs in accounts that I manage.”

A global credit rally fueled by unprecedented stimulus and zero-rate policies has pushed investors to pursue yields in ever riskier realms. While that’s boosting CLOs and the loans that underpin them, the S&P/LSTA Leveraged Loan Price Index is down 3.1% this year while similarly-rated high-yield bonds have erased pandemic losses.