Overseas investors flipped from buyers to sellers of Japan's super-long government bonds, marking the first time in more than a year that net foreign outflows occurred. The shift reflects growing anxiety among international holders about inflation risks and the government's expanding fiscal commitments. Tokyo's super-long bond market, which had been a reliable magnet for foreign capital, suddenly lost its appeal.

Investors had been accumulating these bonds for yield as Japan's super-long maturities offered competitive returns relative to other developed markets. But concerns about inflation and increased fiscal spending are now driving a reversal in capital flows. The sell-off suggests that foreign confidence in Japan's debt sustainability is weakening, even if the underlying economic fundamentals haven't fundamentally changed. Some holders are now reducing positions rather than adding to them.

This marks a significant change in capital flows for Japan's super-long bond market, which had attracted steady foreign buying for over a year. The reversal could pressure yields higher and increase borrowing costs for the government if the outflow continues. Investors are reassessing their positions as inflation fears and fiscal concerns override previous yield advantages.