The U.S. hit a 15-day low against the yen on Thursday as traders used the quiet holiday period to take profits on the dollar's recent gains, while a drop in U.S. Treasury yields on waning risk appetite reduced the greenback's appeal.

The dollar was last down 0.55 percent against the yen at 116.60 yen after falling as much as 0.9 percent in early trading to 116.23 yen, its lowest level since Dec. 14. The greenback had gained 11.5 percent against the Japanese currency between the Nov. 8 U.S. election and Wednesday.