144 0001231589 XXXXXXXX LIVE 0001082554 UNITED THERAPEUTICS CORPORATION 000-26301 1000 SPRING STREET SILVER SPRING MD 20910 (301) 608-9292 PAUL MAHON Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

8300 4494840.93 42446733 06/18/2026 NASDAQ Common 06/18/2026 Stock Option Exercise Issuer N 8300 06/18/2026 Cash N PAUL MAHON

1000 SPRING STREET SILVER SPRING MD 20910

Common 06/04/2026 8300 4540642.45 PAUL MAHON

1000 SPRING STREET SILVER SPRING MD 20910

Common 05/21/2026 8300 4671398.80 PAUL MAHON

1000 SPRING STREET SILVER SPRING MD 20910

Common 05/07/2026 8300 4870054.05 PAUL MAHON

1000 SPRING STREET SILVER SPRING MD 20910

Common 04/16/2026 8300 4787596.87 PAUL MAHON

1000 SPRING STREET SILVER SPRING MD 20910

Common 04/02/2026 8300 4696690.29 PAUL MAHON

1000 SPRING STREET SILVER SPRING MD 20910

Common 03/19/2026 8300 4398610.73 06/18/2026 08/11/2025 /s/ Paul A. Mahon