A poor Treasury auction pelted municipals overall, while Denver International Airport bonds suffered even sharper losses following a Standard & Poor's Corp. downgrade to junk.

"I'd say Denver Airports are [up] 35 basis points, and the rest of the market is [up] 10 to 15," one trader said.

Limited Time Offer

Save $400 off your subscription. Special offer ends April 30, 2017.

14-Day Free Trial

No credit card required. Complete access to articles, breaking news and industry data.