X0306 4/A 2021-06-26 2021-06-29 0001082554 UNITED THERAPEUTICS Corp UTHR 0001756697 Mesa Nilda C/O UNITED THERAPEUTICS CORPORATION/HESS 1040 SPRING STREET SILVER SPRING MD 20910 1 Common Stock 2021-06-26 4 M 0 1680 0 A 6640 D Restricted Stock Units 0 2021-06-26 4 M 0 1680 0 D 2021-06-26 Common Stock 1680 0 D This transaction was originally reported on a Form 4 filed on June 29, 2021, which incorrectly reported the amount beneficially owned following reported transaction as 1,680 due to a clerical error. Each restricted stock unit represents the right to receive, following vesting, one share of United Therapeutics Corporation common stock. The restricted stock units vest on the one-year anniversary of the grant date only if the reporting person attends at least 75% of the regularly scheduled meetings of the issuer's Board and his or her committee meetings from the date of grant until the date of the issuer's next annual meeting of shareholders. Shares will be issued to the reporting person upon vesting unless the reporting person has elected to defer receipt of shares. The restricted stock units vest on the one-year anniversary of the grant date only if the reporting person attends at least 75% of the regularly scheduled meetings of the issuer's Board and his or her committee meetings from the date of grant until the date of the issuer's next annual meeting of shareholders. Shares will be issued to the reporting person upon vesting unless the reporting person has elected to defer receipt of shares. /s/ John S. Hess, Jr. under Power of Attorney 2022-02-16