GPIF Would Be Justified in Buying More Japan Bonds, Analysts Say

Societe Generale SA strategists, including Stephen Spratt, estimate that Japan’s Government Pension Investment Fund (GPIF) has the capacity to buy an additional ¥12.3 trillion ($76 billion) in Japanese government bonds (JGBs). This potential buying could occur without the fund needing to change its official asset allocation mix. The projection is based on the assumption that GPIF gradually increases its domestic bond holdings to the upper end of its current allocation band, raising the weighting from 26.9% as of March to 31%.

This analysis comes amidst calls from Japanese politicians to encourage greater domestic investment by pension funds. Finance Minister Satsuki Katayama and Prime Minister Sanae Takaichi have both publicly advocated for measures that would lead households and pension funds, including GPIF, to invest further in Japanese financial assets. These statements, made in mid-July, caused a brief strengthening of the yen and a drop in JGB yields, with the 10-year rate falling from nearly 2.9% to just under 2.7%.

While the government has stated it has no plans to alter GPIF's benchmark portfolio allocations, it is exploring ways to encourage more domestic investment within the existing framework. GPIF President Kazuto Uchida has reiterated that the fund manages its assets based on its long-term, five-year allocation plan, independent of short-term market or political conditions. As of June 30, 2026, GPIF's assets under management were approximately ¥317.76 trillion (around $2 trillion).

Despite the political pressure, GPIF's current allocation rule for Japanese Fixed Income allows for a plus or minus 6% deviation from its 25% target. According to former asset manager Jun Arima, GPIF tends to keep actual deviations much smaller than the allowable limits, frequently rebalancing its portfolio. In the last fiscal year, GPIF made net excess purchases of approximately ¥14.75 trillion (around $92 billion) in Japanese Fixed Income.

Analysts view this potential for additional JGB purchases as a supportive factor for the debt market. The fund's ability to increase domestic bond holdings within its established asset allocation bands could help stabilize the market, especially given the political desire to channel more institutional money into Japan's bond market and potentially support the yen.