💰 Japanese government bonds were once dismissed by global investors as "zero-yield boredom" — not worth a second look. Now, the world's biggest funds are piling in. Europe's largest asset manager just went bullish for the first time in 30 years, and foreign investors bought roughly $40 billion in a single month — the second-largest monthly total on record. What's driving the seismic shift in Japan's bond market?

The Giant Fund That Ignored Japan for 30 Years Just Changed Its Mind

In February 2026, Amundi — Europe's largest asset manager with approximately $2.8 trillion under management — made a decision that sent shockwaves through global bond markets. The firm shifted its Japanese government bond (JGB) position to "overweight," meaning it now holds more JGBs than the benchmark suggests. The move was historic: Amundi's Chief Investment Officer Vincent Mortier declared, "It's the first time in 30 years we like Japanese bonds."

Just months earlier, Amundi had held the opposite stance — underweight, or bearish on JGBs. The dramatic 180-degree turn was triggered by the February 8 general election, in which Prime Minister Sanae Takaichi's Liberal Democratic Party (LDP) won a landslide victory. Mortier praised the post-election clarity on fiscal policy and debt management, saying recent developments provided reassurance.

Amundi Isn't Alone — A Parade of Global Bulls

The bullish shift isn't limited to one firm. Mark Nash of UK-based Jupiter Asset Management closed long-held short positions on JGBs (bets that prices would fall) and purchased 10-year bonds after the election. He noted that policy concerns that had weighed on JGBs were now dissipating, creating a compelling investment opportunity.

On the American side, DoubleLine Capital ($93 billion in assets) has described JGBs as a valuable "risk-off hedge" — meaning that during global financial shocks, the yen typically strengthens, making JGBs an effective buffer against losses in dollar-denominated portfolios.

MFS Investment Management characterized 2026 as the year "kinri aru sekai" (the world with interest rates) truly arrives in Japan, highlighting yields of approximately 3.3% on 30-year bonds and 3.5% on 40-year bonds as compelling for long-term investors.

State Street Global Advisors added that once the Bank of Japan's rate-hiking cycle concludes, Japanese banks would likely deploy abundant cash reserves into the bond market, further boosting JGB performance.

The Numbers Tell a Staggering Story

The data backs up the anecdotal evidence. According to the Japan Securities Dealers Association, foreign investors purchased a net ¥6.04 trillion (approximately $40 billion) in JGBs in January 2026 alone — the second-largest monthly figure since records began in 2004. (The record was set in March 2023 at ¥6.083 trillion.)

The International Monetary Fund's Japan mission chief, Rahul Anand, confirmed there was no sign that fiscal concerns were dampening foreign demand for JGBs.

Foreign ownership of Japanese government debt has been steadily evolving. While overseas investors hold approximately 6.4% of long-term bonds (excluding T-Bills), when short-term instruments are included, the figure reaches approximately 11.9%, or about ¥144.2 trillion ($950 billion). In the super-long-term bond market (maturities exceeding 10 years), foreign investors now account for roughly half of all trading — surpassing domestic life insurers and pension funds.

Three Structural Forces Behind the Shift

1. Political Stability After the Election

The LDP's commanding victory in the February 8 election dramatically reduced what investors call "policy uncertainty premium" — the extra yield demanded to compensate for political risk. While Prime Minister Takaichi's "active but responsible fiscal policy" stance still raises fiscal discipline concerns, the stable government has made Japan's debt management far more predictable. In investment terms, the "political risk premium" on JGBs has been stripped away.

2. BOJ Rate Hikes and the Return of Real Yields

The Bank of Japan ended its negative interest rate policy in March 2024 and has continued gradual rate increases since then. As a result, the benchmark 10-year JGB yield has risen to approximately 2.1% as of late February 2026 — a far cry from the near-zero (or negative) yields that made JGBs unappealing to foreign investors for years.

Amundi's Mortier called the 2.1% level "quite fair" and expressed strong conviction that any further yield increases would attract sufficient buyer interest to push yields back down to current levels. In other words, there's now a natural "floor" of demand for JGBs at these yields.

3. Diversification Away from the US

Uncertainty around the Trump administration's policies — tariff threats, fiscal expansion concerns, and unpredictable trade moves — is pushing global investors to reduce their heavy concentration in US assets. JGBs, denominated in yen and backed by the world's third-largest economy, offer a compelling alternative for investors seeking to diversify their safe-haven holdings away from US Treasuries.

How JGB Yields Compare to US and European Bonds

The yield gap between Japan and other major bond markets has narrowed dramatically. According to CNBC, the spread between Japan's 10-year bond and the US 10-year Treasury has compressed by approximately 115 basis points (1.15 percentage points) over the past year. The Japan-UK spread narrowed by about 92 basis points, and the Japan-Germany spread by approximately 45 basis points.

This compression has profound implications. For years, Japanese investors were essentially forced to invest overseas because domestic yields were negligible. Now, for the first time, domestic bonds are becoming more attractive than foreign alternatives, especially when currency hedging costs are factored in.

If Japanese institutional investors — who are among the world's largest holders of US Treasuries (owning more than $1 trillion) — begin rotating capital back home, the ripple effects across global bond markets could be significant. As one analyst warned, "Markets still appear to be behaving as if Japanese volatility is a temporary disturbance rather than a regime shift, which is a mistake."

The Carry Trade Is Unraveling

For decades, the "yen carry trade" was one of the most popular strategies in global finance: borrow cheaply in yen (at near-zero rates), then invest in higher-yielding currencies like the US dollar or Australian dollar. It was a seemingly easy way to profit from Japan's ultra-low interest rates.

But as the BOJ raises rates, the cost of borrowing yen has increased, eroding the carry trade's profitability. Simultaneously, the yen's fundamental outlook has improved — if the BOJ continues on its tightening path, the yen is more likely to strengthen, creating potential currency losses that could wipe out carry trade gains.

The market's perception of the yen is shifting from "cheap funding currency" to "a currency with improving fundamentals" — a transformation that reinforces the attractiveness of JGB investments for foreign holders.

Risks That Cannot Be Ignored

The bull case for JGBs comes with important caveats.

Supply Pressure: Under Takaichi's expansionary fiscal plans, the net supply of JGBs to the market in fiscal year 2026 is projected to increase approximately 8% year-over-year to about ¥65 trillion ($430 billion) — the largest volume in over a decade. Whether foreign demand can absorb this supply surge is a critical test.

Market Vulnerability: With foreign investors accounting for half of all super-long-term bond trading, the market is highly sensitive to shifts in global risk sentiment. A sudden exodus of foreign capital could trigger sharp yield spikes.

BOJ Balance Sheet Reduction: The Bank of Japan is gradually reducing its massive bond holdings — a process known as quantitative tightening. As the BOJ steps back as a buyer, the market must find replacement demand from the private sector.

Fiscal Trajectory: Japan's government debt-to-GDP ratio remains the highest among developed nations. If market confidence in fiscal discipline wavers, the recent gains in JGB appeal could evaporate quickly.

A Historic Turning Point for Japan's Bond Market

Japan's bond market is at a clear inflection point — transitioning from an era where foreign investors turned their backs on JGBs to one where they are actively supporting the market. The fact that firms with fundamentally different investment philosophies — Amundi (value-focused), Jupiter (macro-driven), DoubleLine (credit-oriented) — have all simultaneously turned bullish suggests this is not a temporary blip but the beginning of a structural shift.

Whether 2026 becomes the year JGBs establish themselves as an essential component of global portfolios depends on three key factors: the pace of BOJ rate hikes, the government's fiscal discipline, and the direction of global capital flows as investors reassess US-centric strategies.

In Japan, government bonds that offered near-zero returns for decades are suddenly attracting the world's biggest investors. How are your country's government bonds viewed by foreign investors? And how does your central bank's monetary policy affect your bond market? We'd love to hear your perspective — share your thoughts in the comments!

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