Japan’s super-long bond yields surged by 27 basis points, as reflected in the 30-year and 40-year yields. This sell-off underscored a complete loss of confidence in Japanese government bonds (JGBs). The situation worsened after comments from Japan’s Growth Strategy Minister, Minoru Kiuchi, who downplayed the fiscal link to JGB movements.
Reliance On Foreign Buyers
Japan Securities Dealers Association data showed the risk of relying heavily on foreign buyers in the JGB market. Foreign buyers purchased JPY 13.4 trillion of JGBs over 10 years in 2025, the highest since 2005. Trust banks followed with JPY 4.7 trillion. Foreign sell-offs in significant intra-day moves could impact market sentiment further.
Sell-offs were driven by PM Takaichi’s acknowledgement of a sales tax cut on food for up to two years, with concerns over fiscal financing leading to additional JGB issuance. This suggests senior government officials’ indifference to market disruptions might spur more selling.
Pressure is now mounting on the Bank of Japan to become the buyer of last resort. The BoJ is gradually reducing its JGB purchases, but more buying could be required. The yen’s weakening, especially against non-dollar currencies, may continue amidst JGB market turmoil.
Given the sharp 27 basis point surge in super-long JGB yields, we see a clear signal of collapsing confidence in Japan’s fiscal policy. The government’s proposed sales tax cut, likely to be funded by new debt, is the immediate trigger for this market rout. Derivative traders should consider shorting JGB futures or buying put options to capitalize on the expectation of further price declines in Japanese government bonds.
Yen Weakness And Market Repercussions
The extreme dependence on foreign capital, which we saw when they purchased a record JPY 13.4 trillion in long-dated JGBs during 2025, has now become a major vulnerability. As these investors are forced out of their positions, volatility is spiking, a condition that is likely to persist in the coming weeks. This environment is ideal for long volatility strategies, such as buying straddles on JPY currency pairs to profit from large price swings.
This turmoil is reinforcing yen weakness, a trend that has been building for some time. With USD/JPY having recently surged past the 155 level, a key psychological barrier, the path of least resistance appears to be a weaker yen. We believe positioning for further declines through options on currency pairs like EUR/JPY and GBP/JPY remains a viable strategy.
All eyes are now on the Bank of Japan, which is caught in a difficult position of needing to calm the bond market while also conveying a hawkish stance to support the currency. This creates significant event risk around their upcoming policy meetings, as any surprise action could cause a sharp market reversal. Traders should use derivatives to hedge their positions or speculate on a policy surprise, such as buying short-dated JPY call options ahead of the next BoJ announcement.
The contagion from the JGB sell-off is already visible, pushing global bond yields higher in a manner reminiscent of the UK’s fiscal crisis back in 2022. We have already seen the U.S. 10-year Treasury yield climb back toward 4.3% in overnight trading, confirming that this is not just a localized issue. This suggests that short positions on U.S. Treasury and German Bund futures could be effective, as the instability in a cornerstone market like Japan’s fuels a broader repricing of government debt worldwide.
