Japan's Potential Sale of US Treasuries Impacts Yields
If Japan sells US Treasuries on a large scale to support the yen, it could increase bond supply, lower prices, and push up US long-term yields; this is a risk scenario and not a confirmed concentrated sell-off.
Japan is the largest foreign creditor of the US, holding not "hundreds of millions" but approximately $1.14 trillion; its holdings decreased from $1.210 trillion in April 2026 to $1.143 trillion in May 2026.
The Japanese Ministry of Finance has stated that interventions to buy yen and sell dollars could theoretically involve selling US Treasuries, but its foreign exchange reserves also include cash, maturing assets, and interest income, which may not require direct sales of Treasuries.
Japan and the US have recently coordinated interventions in the yen, with both sides emphasizing the Fed's FIMA repo tool. This mechanism allows foreign currency authorities to exchange US Treasuries for dollar liquidity, avoiding direct sales of Treasuries into the secondary market.
The market's concern chain is: yen depreciation → Japan needs to raise dollars to buy yen → potential sale of US Treasuries → rise in US Treasury yields → pressure on US mortgages, corporate financing, and federal interest expenditures. The 30-year fixed mortgage rate is highly correlated with the 10-year US Treasury yield.
Mechanically, if Japan reduces its holdings, buyers will shift to US domestic investors, banks, funds, and hedge funds that are more sensitive to yields; to absorb the new supply, the market will require higher yields. Therefore, Japan can reduce direct selling pressure through FIMA repos, cash reserves, and coordinated interventions, benefiting US Treasury market liquidity and US borrowers, while putting pressure on housing, fiscal, and overvalued assets that rely on low interest rates.
Source: Public Information
ABAB AI Insight
Japan's impact on US Treasuries comes from its long-term capital structure rather than short-term political statements. Its holdings peaked at $1.325 trillion in November 2021, after which the relative attractiveness of US assets for Japanese institutions decreased due to the normalization of Japanese interest rates, changes in currency hedging costs, and rising domestic bond yields.
The key to the funding path is Japan's foreign exchange intervention. Traditionally, the Japanese Ministry of Finance sells dollar assets and buys yen; if dollar assets are primarily US Treasuries, the intervention could spill over into impacting long-term US rates. The FIMA repo changes "selling US Treasuries for dollars" to "collateralizing US Treasuries to borrow dollars," replacing outright sales with term liquidity financing.
Historically, China has been viewed as a major risk source for changes in foreign demand for US Treasuries, but its holdings are about $700 billion, lower than Japan's approximately $1.2 trillion; Japan's uniqueness lies in its financial institutions being long-term significant buyers of US term assets while facing dual constraints of yen appreciation and rising Japanese bond yields.
This represents a shift in pricing power. When Japan stops increasing its holdings, the US Treasury cannot finance overseas official and institutional capital at old yields; new issuances will be handed over to market buyers who place more emphasis on risk compensation. Rising yields do not require panic selling from Japan; as long as its marginal buying decreases, it will force US Treasuries to be repriced at higher term premiums.
ABAB News · Law of Cognition
When the largest buyer stops increasing positions, prices must learn to concede.
The endpoint of currency intervention is often the interest rates of another country.
The real debt risk is not the absence of buyers, but that buyers demand higher returns.