September 15, 2025 · By Mariusz Kurylo · Bond Market Collapse

Japan's Treasury Dump: Tokyo Sells $80 Billion in U.S. Bonds to Defend the Yen

Published: September 15, 2025 | By Mariusz Kurylo

Japan, the second-largest foreign holder of U.S. Treasury securities with approximately $1.1 trillion on its books at the start of 2025, has spent the past year quietly but systematically liquidating a portion of that position to fund currency intervention in defense of the yen. According to Treasury International Capital (TIC) data reported by Bloomberg and the Wall Street Journal, Japan's Treasury holdings declined by roughly $80 billion over the twelve months ending June 2025 — a pace of selling that, while not disorderly, represented one of the most significant sustained reductions in Japan's Treasury portfolio in a decade.

The mechanics are straightforward if the geopolitical implications are not: when the Bank of Japan sells yen to buy dollars in an attempt to arrest a falling yen, it accumulates dollar reserves. Conversely, when it wants to support the yen by buying yen and selling dollars, it must first obtain those dollars somewhere — typically by selling the most liquid dollar-denominated asset it holds, which is U.S. Treasury securities. Japan's intervention to defend the yen at key technical levels in 2024 and 2025 required substantial dollar liquidity, and Treasuries were the primary source.

For the U.S. bond market, even gradual and predictable Japanese selling carries consequences. Japan has historically been a consistent, price-insensitive buyer of long-dated Treasuries — a stabilizing force in a market that sometimes struggles to find demand for its enormous weekly issuance. Its transition to a net seller, even temporarily, removes a structural backstop and adds to the supply-demand imbalance that has kept long-term yields elevated.

Why the Yen Has Been Under Pressure

To understand Japan's Treasury selling, it is necessary to understand the extreme monetary policy divergence between Japan and the United States that drove yen weakness to multi-decade lows. The Bank of Japan, under its long-running "yield curve control" (YCC) framework, maintained ultra-low domestic interest rates for years while the U.S. Federal Reserve raised rates aggressively from near zero to above 5% in 2022–2023.

This divergence created a massive "carry trade" incentive: investors borrowed cheaply in yen, converted to dollars, and invested in higher-yielding U.S. assets. The resulting demand for dollars and supply of yen pushed the USD/JPY exchange rate toward 160 — levels not seen since the late 1980s bubble era, Reuters reported. For Japanese households and corporations that import goods priced in dollars (oil, food, industrial inputs), a weak yen was economically devastating, adding to inflation in an economy that had spent decades fighting deflation.

The BOJ eventually began cautiously raising interest rates in 2024, but the pace was too slow to close the interest rate differential significantly. Japanese authorities intervened directly in currency markets multiple times, with the Finance Ministry spending tens of billions of dollars in intervention operations that Bloomberg estimated cost between $60–80 billion in FX reserves — reserves that were, in large part, held in U.S. Treasuries.

The Scale of Japanese Treasury Holdings

Japan's Treasury position needs context to fully appreciate. According to U.S. Treasury data compiled by Bloomberg, Japan held approximately $1.1 trillion in Treasury securities at the start of 2025, making it the second-largest foreign holder after China (which held approximately $750 billion, having reduced its peak position from $1.3 trillion in 2013). Together, Japan and China account for roughly $1.85 trillion in foreign official Treasury holdings — about 7% of the total outstanding debt.

A reduction of $80 billion from Japan's position, spread over twelve months, is not by itself sufficient to destabilize Treasury markets. The U.S. issues approximately $2–3 trillion in new Treasury securities annually, and the Federal Reserve, domestic pension funds, money market funds, and other buyers absorb the vast majority of it. But the direction matters as much as the magnitude. Wall Street Journal analysis noted that the combination of Japanese and Chinese reductions — China has been a steady seller since 2015 — means that the "automatic bid" from foreign official holders that provided a structural subsidy to U.S. borrowing costs for decades is no longer operative.

How Japanese Selling Affects Treasury Yields

The mechanics of Japanese intervention selling are well-understood by Treasury market professionals but less visible to retail investors. When the BOJ or Japan's Ministry of Finance sells Treasuries, it floods the market with supply that must be absorbed by other buyers at some price — which typically means a lower price, or equivalently, a higher yield.

Because Japan tends to hold long-dated Treasuries (10-year and 30-year bonds), its selling pressure is concentrated at the long end of the yield curve. This helps explain the "bear steepening" pattern — long-term yields rising faster than short-term yields — that bond strategists at JPMorgan and Goldman Sachs noted in 2024 and 2025, according to their published research cited by Bloomberg.

For mortgage rates, which are priced off the 10-year Treasury, even a 15–20 basis point increase driven by Japanese selling translates directly into higher monthly payments for American homebuyers. For the federal government, higher long-term yields mean higher borrowing costs on new debt issuance and rollovers — a compounding fiscal problem given the volume of debt that matures and requires refinancing each year.

What the Bank of Japan Is Doing With Its Policy

The BOJ's gradual normalization of monetary policy is the underlying force that will ultimately determine whether Japan remains a net seller of Treasuries or stabilizes its position. Reuters reported that the BOJ raised its policy rate to 0.5% in early 2025 — still historically low but a significant shift from the negative rate era. Governor Kazuo Ueda signaled in multiple press conferences that further rate increases were possible if inflation remained above the BOJ's 2% target, which it did through most of 2024 and into 2025.

Higher Japanese interest rates, all else equal, reduce the yen carry trade incentive and therefore reduce the structural yen selling pressure that had forced currency intervention. If the BOJ can normalize rates to 1–1.5% over the next two years without triggering recession — a significant "if," given Japan's debt-to-GDP ratio exceeding 250% — the yen's structural weakness could ease and Treasury selling pressure could diminish.

Financial Times noted, however, that the BOJ's normalization path was fraught with risk. Japan's government bond market, where the BOJ holds an enormous position accumulated through years of QE, could itself face disruption if rates rose faster than expected. A Japanese JGB crisis — the subject of perennial market speculation — would have second-order effects on the global fixed income complex, including U.S. Treasuries.

Who Else Is Selling — and Who Is Left to Buy

Japan and China are not the only foreign holders reducing Treasury exposure. Bloomberg TIC data analysis shows that several other large holders — Saudi Arabia, Taiwan, Belgium (which serves as a custodial account for various European holders) — have also been net sellers or have slowed their purchases in the 2024–2025 period.

The buyers that have partially replaced foreign official demand are domestic: U.S. money market funds, pension funds, and household investors attracted by 4–5% yields that had not been available in the prior decade. But domestic buyers are generally more price-sensitive than foreign central banks, which buy Treasuries for reserve management and geopolitical reasons rather than purely for return. As the buyer base shifts from price-insensitive foreign officials to price-sensitive domestic investors, Treasury yields may need to be durably higher to clear the market at each auction — a structural change with long-term fiscal consequences.

Bond Buyer's auction analysis showed that Treasury auctions in 2025 were clearing with "tails" — meaning the final clearing yield was above where secondary market trading suggested — more frequently than at any point since 2010. This technical indicator of weak auction demand, combined with elevated yields, painted a picture of a Treasury market that was functioning but required higher rates to attract adequate buying interest.

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Sources: Bloomberg, Reuters, The Wall Street Journal, Financial Times, CNBC, Bond Buyer

Disclaimer: This article is for informational and educational purposes only. It does not constitute financial, legal, or investment advice.