40-year Japanese government bond yield climbs to 3.860%, up 3.5 basis points

The 40-year Japanese government bond yield rose to 3.860%, increasing 3.5 basis points, reflecting growing market sensitivity to shifts in long-term yield expectations. This move is being driven by repricing in sovereign yield curves amid elevated inflation persistence and increasing supply concerns in Japan’s bond market. The steepening in long-dated JGB yields is transmitting to US Treasury markets through global duration positioning, pressuring the US10Y yield higher as investors adjust cross-market carry trades. Long-duration government bonds, particularly in Japan and the US, are most exposed due to their sensitivity to rate differentials and inflation-linked policy uncertainty. Traders will focus on the upcoming Bank of Japan policy meeting and US CPI data for signals on yield curve control adjustments and Fed rate path implications.

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