A Long-term Study of STAR-0215 in Participants With Hereditary Angioedema

Inclusion Criteria: * Open to participants from STAR-0215-201 (NCT05695248) who have met one of the following conditions: * Completed STAR-0215-201 (follow up through 6 months after their last dose); * Eligible for STAR-0215-201 and entered the Run-In period but did not qualify for the Treatment Period because they did not meet the criterion for the minimum number of HAE attacks; * Eligible for STAR-0215-201 and entered the Run-In period but did not complete it for reasons other than not meeting the criterion for the minimum number of HAE attacks (eligibility requires consultation with the Medical Monitor); or * Discontinued STAR-0215-201 (for reasons other than safety) after having completed at least 84 days of trial follow-up since their last dose of STAR-0215 (eligibility requires consultation with the Medical Monitor). * Open to participants who are STAR-0215 naïve and were not enrolled in STAR-0215-201 (NCT05695248), have a documented diagnosis of HAE (Type 1 or Type 2). Exclusion Criteria: * Any concomitant diagnosis of another form of chronic angioedema, such as acquired C1 inhibitor deficiency, HAE with normal C1-esterase inhibitor protein (also known as HAE Type III), idiopathic angioedema, or angioedema associated with urticaria. * Any exposure to angiotensin-converting enzyme inhibitors or any estrogen-containing medications with systemic absorption (such as hormonal contraceptives or hormone replacement therapy) within 28 days prior to Screening * Any exposure to androgens (for example, stanozolol, danazol, oxandrolone, methyltestosterone, testosterone) within 7 days prior to Screening. * Use of therapies prescribed for the prevention of HAE attacks prior to Screening: * lanadelumab within 90 days * berotralstat within 21 days * all other prophylactic therapies, discuss with the Medical Monitor Note: Other inclusion and exclusion criteria may apply.