There are a number of both high-yield muni ETFs and high-yield corporate bond ETFs available, from the major issuers, such as Vanguard, BlackRock, State Street, et. al.

That said, the spread between triple-B corporate bonds in the U.S. and Treasury bonds has slimmed to just 1.06%, according to the Federal Reserve. That’s down from around 1.60% a year ago.

Investors looking for more yield than US Treasuries provide often turn to corporate bonds, but the enormous number of issues and opaque ... the $8.4 billion Schwab 5-10 Year Corporate Bond ETF ...