Japanese investors sold ¥4.67 trillion ($29.6 billion) in US government, agency, and municipal bonds in Q1 2026, the largest quarterly exit since 2022. The Bank of Japan's policy normalization has pushed domestic yields to 30-year highs, giving Japan's life insurers and pension funds a competitive alternative to US Treasuries for the first time in decades.

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How the Bank of Japan Ended a Decade of Near-Zero Yields

For most of the past decade, the BOJ held its benchmark rate at or below zero and used yield curve control to pin the 10-year JGB near 0%. Japanese institutions had no domestic yield option worth pursuing, so they recycled savings into US Treasuries and other foreign debt. Japan became the single largest foreign holder of US government bonds as a direct result.

That framework started unwinding in 2024. The BOJ raised its short-term policy rate multiple times, reaching 0.75% in December 2025. It simultaneously cut monthly JGB purchases from ¥5.7 trillion in August 2024 to ¥2.9 trillion by Q1 2026 - nearly halving the pace of central bank bond-buying in 18 months.

JGB yields responded. The 10-year reached 2.78% on May 18, its highest since 1997. The 30-year climbed to near 3.9%, a record for that maturity since the bond's introduction in 1999.

$29.6 Billion Out: Who Is Selling and Why the Scale Matters

The ¥4.67 trillion Q1 total covers US Treasuries, agency bonds, and municipal debt. Japan still holds roughly $1.203 trillion in US government paper - about 13% of all foreign-held US debt - so Q1's selling represents only about 2.5% of the total position. That fraction is what makes the acceleration worth watching.

The sellers are structural buyers by nature: life insurers and pension funds with 30-to-40-year liability horizons. They held US Treasuries because domestic bonds returned almost nothing. With 30-year JGB yields now above 3.8%, that calculus has shifted.

Mark Dowding, chief investment officer at BlueBay, told the Financial Times: "The new money that's being put to work won't be put to work overseas. It won't be going into US Treasuries. It will be going into those domestic allocations." March saw the largest monthly inflow ever recorded into Japanese sovereign bond funds.

Why Rising JGB Yields Hit US Treasury Auctions and Bitcoin

When Japan steps back from Treasury buying - or actively sells - the US must find replacement buyers, usually at higher yields. TD Economics projects Japan's reduced bond investment could push 10-year US yields 20 to 50 basis points higher over the medium term. The Treasury sold $25 billion of 30-year bonds last week at a 5% yield, the first time that maturity cleared 5% since 2007.

For Bitcoin, the channel runs through carry trade liquidity. Near-zero Japanese rates funded leveraged positions across global risk assets for years, crypto included. When the BOJ raised rates in July 2024, Bitcoin dropped from around $65,000 to $49,000. Each subsequent rate hike shrinks that same funding base.

Higher US yields add a second layer of pressure. A 10-year Treasury at 4.5%-5% competes directly with Bitcoin for institutional capital allocations that have a yield alternative.

The BOJ's Expected June Hike and the Trajectory of a $1.2 Trillion Position

The BOJ is widely expected to raise rates again next month, pushing its benchmark from 0.75% to 1% - the highest level in three decades. Board member Kazuyuki Masu called publicly in mid-May for rates to be raised "as soon as possible," citing increasingly persistent inflation. Japan's FY2026 core inflation came in at 2.8%, well above the 2% target.

Matt Smith, fund manager at Ruffer, told the Financial Times: "Pressure is building - long-end domestic yields are rising. We think yen strength will happen slowly, then quickly."

At Q1's pace, annual outflows from US bonds could exceed $100 billion. The remaining $1.2 trillion position - 97.5% still intact - is the figure that matters most. If this stays a gradual rotation, Treasury markets absorb it. If the pace accelerates, what starts as portfolio rebalancing becomes a structural problem for anyone holding risk assets that thrived on cheap Japanese capital.

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P.S. This article is for informational purposes only and does not constitute investment advice. Always conduct your own research and make independent decisions.