Japan Rate Hike Spillover: French Bonds Bear the Brunt, U.S. Treasuries Under Pressure
nashnova research
After Japan's 10-year yield broke above 3%, Japanese investors began unwinding a $145 billion overweight in French bonds, pushing France's 10-year yield near 5% — a 2002 high. U.S. Treasuries fell in tandem, yields hitting 5.28%. Both sell-offs trace back to the same source: Japan.
Why is Japanese money dumping French bonds?
As of July, Japanese investors held roughly ¥23 trillion (~$145 billion) in French government bonds — the largest single-country overweight in the eurozone.
Japan's 10-year yield broke above 3% last month, a nearly 30-year high. After hedging costs, France's yield advantage over JGBs has narrowed to just ~40 basis points. This means → the core reason Japanese money held OATs — "the spread is fat enough" — is vanishing.
Sumitomo Mitsui DS Asset Management has exited French bonds entirely on fiscal concerns. Mizuho's Masayuki Nakajima said: "Even if valuations look cheaper, the incentive for Japanese investors to rebuild positions is declining."
How deep is France's fiscal hole?
The France-Germany 10-year spread widened 32 bps last week to 141 bps. Deutsche Bank's Jim Reid called it the largest single-week widening in Bloomberg data going back to 1990 — spanning German reunification, the euro crisis, and Covid.
French debt stands near 120% of GDP; the deficit has exceeded 5% for three straight years. Bank of France Governor Emmanuel Moulin warned that without fiscal consolidation, France risks being "gradually strangled" by rising rates.
On the supply side: Agence France Trésor plans to issue a record €340 billion in 2027. Goldman Sachs estimates net duration supply will run about 25% above this year's level. In plain terms = France is not only paying more on old debt — it also needs to issue far more new debt. A squeeze from both ends.
Treasuries: Japan doesn't need to "dump" to push costs up?
In the first half of this year, Japanese domestic investors net-sold ¥4.45 trillion (~$28 billion) in long-term U.S. Treasuries — the first half-year net sale since 2022.
Bloomberg columnist Gearoid Reidy noted that a Japanese fire-sale of Treasuries is unlikely — Tokyo's dependence on Washington's security umbrella creates a political reality. But his key point: Japan does not need to "dump" to raise U.S. borrowing costs. "Just buying less is enough."
This means → the Treasury market's vulnerability to Japan is not about stock selling but about flow absence. Remove the marginal buyer and yields rise on their own.
How does Wall Street read the transmission mechanism?
Ed Yardeni of Yardeni Research argues the driver is the yen carry trade — a strategy of borrowing cheap yen to buy foreign bonds — unwinding. As the BOJ raises rates, carry traders are forced to sell, and he frames the moment as "the revenge of the bond vigilantes."
Deutsche Bank's Shoki Omori pushes back. He says carry unwinds leave a distinct market "fingerprint": yen spikes, equities drop, Treasuries rally on safe-haven flows. The current pattern is the exact opposite — bonds and the yen are falling together. This reflects an inflation-and-rate repricing signal, not deleveraging.
In plain terms = the two sides disagree sharply on *how* the shock transmits, but agree on one thing: the root points to the Japanese bond market.
How much Japanese money is "coming home"?
Japan's Government Pension Investment Fund (GPIF) bought ¥5.7 trillion in JGBs in Q2 — more than double the five-year average for the same period. Public pensions overall bought ¥6.8 trillion.
On the retail side, Japanese retail JGB subscriptions broke ¥1 trillion for the first time in July 2026 and have stayed at that level for several consecutive months — the first time since the current sales format launched in 2014.
Yet Japan has not pulled back across the board — it remained a net buyer of German, Italian, and U.K. bonds in H1. This means → Japanese capital is becoming more selective, not retreating wholesale. Whichever sovereign market offers insufficient yield compensation gets cut first.
Could the chain reaction spread?
Macro Hive's Antonio Del Favero worries about contagion: if Japan trims its overweight because France is "no longer a clean core allocation," benchmark investors in the U.S., Asia, and parts of Europe may also reassess.
Godo Asset Management's Hideo Shimomura is blunter: "This is just the beginning. If the ECB stands by, the euro-crisis playbook suggests France's 10-year yield could reach 7%."
Reidy's conclusion: with Japan's rate normalisation still incomplete, which sovereign bond markets can offer sufficient yield compensation will be the decisive variable for Japanese capital flows. In plain terms = it used to be countries competing to sell debt to Japan. Now the roles are reversed — every country's bonds must offer a premium for Japanese capital.
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