SOUTH BOW ANNOUNCES SUCCESSFUL OPEN SEASON

CALGARY, Alta. – May 29, 2026 – South Bow Corp. (TSX & NYSE: SOBO) (South Bow or the Company) announces the successful outcome of its open season, which closed on March 30, 2026, securing 20-year binding commitments for firm transportation service from Hardisty, Alta., to U.S. delivery points.

South Bow Shares Findings of Root Cause Analysis of Milepost 171 Incident

South Bow Corp. (TSX & NYSE: SOBO) (South Bow or the Company) and the Pipeline and Hazardous Materials Safety Administration (PHMSA) have received the independent third-party root cause analysis (RCA) of the incident that occurred at Milepost 171 (MP-171) of the Keystone Pipeline on April 8, 2025, near Fort Ransom, N.D.