Yields on two-year paper were also unchanged at 0.65 percent.
U.S. stocks rallied, with the Dow ending up more than 230 points.
Renewed appetite for risk appetites was hurting traditional safe-havens such as bonds for now, analysts said.
In terms of economic data, the September ADP Employment report showed private firms added 200,000 jobs in September, but August totals were revised down by 4,000.
The September Chicago purchasing managers index came in at 48.7, below the expects reading of 53.
Read MoreRocky stock market faces potential pitfalls into year-end
Federal Reserve Chair Janet Yellen did not comment on the U.S. economy or monetary policy in brief welcoming remarks to a community banking symposium on Wednesday. It was Yellen's first public appearance since a health scare last week in Massachusetts in which she stumbled over her words and struggled to complete a nearly hour-long speech.
"The most notable data from the U.S. today will be the release of the ADP employment figures for September, which, ahead of Friday's labour market report, are expected to suggest that private non-farm payrolls were up around 190k, the same ADP reading for August," analysts at Daiwa Capital Markets said in a note.
—Reuters contributed to this report.