JGB Yields Climb as Calls Grow for GPIF to Boost Japanese Bond Holdings
nashnova research
Japan's 10-year government bond yield neared 3% — a roughly three-decade high — prompting analysts to argue that GPIF, the world's largest pension fund with ¥318 trillion in assets, should lift its domestic-bond target above the current 25%; every one-percentage-point shift could move more than ¥3 trillion.
Yields are near 3% — why does that change the calculus?
The benchmark 10-year Japanese government bond yield briefly approached 3%, the highest in about thirty years. Bond prices fell, but coupon income on newly purchased bonds rose.
This means → JGBs, long dismissed as "too low-yielding to bother with," are regaining appeal — giving GPIF an economic case to add exposure.
As of end-June, GPIF managed roughly ¥318 trillion (about $2 trillion). A one-percentage-point shift in allocation could trigger more than ¥3 trillion in fund flows.
How high do analysts want the target — and where does the money come from?
Koji Okuda, executive researcher at Dai-ichi Life Research Institute, said raising the domestic-bond allocation from 25% to 30%–35% is worth considering — once GPIF has assessed expected returns and risks across multiple economic scenarios.
In plain terms = the economy looks nothing like it did when 25% was set; with yields this much higher, tilting toward bonds makes mathematical sense.
By Okuda's estimates: a 30% target would require buying roughly ¥16 trillion in JGBs; a 35% target would double that to about ¥32 trillion — funded mainly by trimming foreign bonds.
Kiyoshi Ishigane, executive chief fund manager at Mitsubishi UFJ Asset Management, agreed that given currency risk, "it would not be strange to start thinking about reducing overseas assets and raising domestic bonds."
Politicians are pushing — is the market signaling the same thing?
Prime Minister Sanae Takaichi and Finance Minister Satsuki Katayama have stepped up pressure on GPIF to direct more capital into Japanese domestic markets.
Health Minister Kenichiro Ueno said in July that "adjustments to the basic portfolio will be made if necessary," while stressing that the guiding principle remains generating returns for pension beneficiaries.
Nippon Life, Japan's largest life insurer, said last week it intends to become a net buyer of JGBs in the next fiscal year, citing attractive rate levels. This reflects a broader shift in sentiment among domestic institutional investors.
What are the objections — and where is the threshold?
Takahiro Niimi, senior economist at NLI Research Institute, warned that if GPIF raises its bond weighting, it may have to take on more risk elsewhere to hit its return target — "the hurdle for adjustment is high."
In plain terms = buying more bonds means buying fewer equities or foreign assets; the portfolio's expected return could drop, forcing bigger bets elsewhere to compensate.
Kenji Shiomura, a Daiwa Research Institute researcher and former GPIF official, argued that once wage growth is stripped out, rates have not risen significantly — making the case for a higher bond allocation "unclear."
What does GPIF itself say — is rebalancing already doing the job?
A GPIF spokesperson said the fund does not see a meaningful gap between the current investment environment and the assumptions behind its portfolio — in effect, no change is deemed necessary for now.
Yet Masaki Kuwahara, senior rates strategist at Nomura Securities, noted that GPIF injected ¥5.7 trillion into JGBs in the April-to-June quarter — the highest single-quarter figure since fiscal 2020.
This means → even without a formal target increase, GPIF's routine rebalancing — buying assets back toward their target weights — is already channeling large sums into domestic bonds.
The core question: will GPIF change the rules mid-cycle?
GPIF's current basic portfolio took effect in the fiscal year ending March 2026 and runs for five years, targeting returns of nominal wage growth plus 1.9 percentage points over the long term.
Through the April-to-June quarter, GPIF had posted losses on domestic bonds for seven consecutive quarters — yet rising yields mean newly purchased bonds carry better coupons going forward.
The market's central question: will GPIF adjust its allocation mid-cycle — as it did in October 2014, when it slashed domestic bonds from 60% to 35% — a decision that would directly determine where tens of trillions of yen flow next.
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