144 0002046292 XXXXXXXX LIVE 0002019061 South Bow Corporation 001-42021 707 5th Street SW Suite 900 CALGARY A0 T2P 1V8 587-318-5410 Richard Prior Senior Vice President & COO Common Shares Canaccord Genuity Corp.

Centennial Place - East Tower 520 3rd Ave SW, Suite 2400 Calgary A0 T2P 0R3

41050 45.50 208250512 03/09/2026 TSX Common Shares Canaccord Genuity Corp.

Centennial Place - East Tower 520 3rd Ave SW, Suite 2400 Calgary A0 T2P 0R3

50841 45.25 208250512 03/09/2026 TSX Common Shares 03/09/2026 Stock Option Exercise South Bow Corporation N 41050 03/09/2026 Compensation Common Shares 03/09/2026 Stock Option Exercise South Bow Corporation N 50841 03/09/2026 Compensation N Richard Prior

12414 Mossycup Drive Houston TX 77024

Common Shares 12/17/2025 365 10037.50 Enter an explanation below if there is an exception regarding proprietary interests. 03/09/2026 /s/ Richard Prior