TOKYO -- Sharp rises in interest rates of overseas bonds, which represent drops in their price on the flip side, have posed challenges for Japanese megabanks.
Unrealized losses on bonds total $12.5bn for the three top banks

While the giant Japanese banks' overall securities holdings still carry unrealized gains, their capital adequacy is threatened.
TOKYO -- Sharp rises in interest rates of overseas bonds, which represent drops in their price on the flip side, have posed challenges for Japanese megabanks.