Seoul: South Korean bond yields exhibited varied movements across different maturities on September 18, 2026. The 1-year Treasury bond yield increased by 0.4 basis points to 3.670% from the previous session's 3.666%. In contrast, longer-term bonds saw a decline in yields, with the 10-year Treasury bond yield decreasing by 4.0 basis points to 4.466%, compared to 4.506% in the previous session.

According to Yonhap News Agency, the 2-year Treasury bond yield fell by 1.4 basis points, settling at 3.980% from the previous 3.994%. The 3-year Treasury bond yield also decreased, dropping by 2.8 basis points to 4.035% from 4.063%. Similarly, the 2-year Monetary Stabilization Bond yield experienced a slight decline of 0.6 basis points to 3.989% from 3.995%.

The 3-year Corporate Bond (AA-) yield saw a reduction of 2.0 basis points, moving to 4.706% from 4.726%. Meanwhile, the 91-day Certificate of Deposit remained unchanged at 3.200%. These changes reflect varied investor sentiment and market conditions affecting different bond maturities in South Korea.