Japanese Prime Minister Sanae Takaichi reversed her earlier position and called for a supplemental budget on May 18 in response to surging commodity prices linked to the ongoing Middle East conflict. The announcement triggered fresh record highs in Japanese super-long bond yields, with 40-year JGB yields breaching levels not seen in modern data, reflecting investor concerns about fiscal sustainability layered on top of Bank of Japan normalization.
Japanese life insurers and pension funds are among the largest holders of US Treasuries, and yield spikes at home can prompt repatriation selling of foreign bonds, reducing Treasury collateral supply in global repo markets. Armada's traditional repo desk should watch for unusual bid-cover ratios at upcoming Treasury auctions and any widening of repo specialness in long-dated issues as a leading indicator of Japanese investor activity.