TOKYO, Nov 15 (Reuters) - Japanese government bond prices were mostly steady on Thursday as an auction of 5-year debt proceeded smoothly and attracted decent investor demand.
The 5-year notes were sold at the lowest price of 100.91, marginally higher than market expectations of about 100.89-90, and the auction drew bids of 3.89 times the amount offered.
The 10-year JGB futures gained 0.04 point to 150.88, with a trading volume of 25,179 lots, supported by firmer U.S. Treasuries and softer Japanese shares.
Benchmark 10-year cash JGB yield rose 0.05 point to 0.110 percent, while the 20-year and the 30-year yields dropped half a basis point to 0.630 percent and 0.860 percent, respectively.
The 40-year yield was unchanged at 1.020 percent. (Reporting by Tokyo Markets Team; Editing by Sherry Jacob-Phillips)