A Study of STAR-0215 in Participants With Hereditary Angioedema

Inclusion Criteria:

1. Documented diagnosis of HAE (type I or II). The following must be met: a. Documented clinical history consistent with HAE (for example, subcutaneous ormucosal, nonpruritic swelling episodes without accompanying urticaria).

2. Experienced at least 2 HAE attacks during the Run-In period, as confirmed by aninvestigator based on meeting the protocol-specified definition of an HAE attack.

Exclusion Criteria:

1. Any concomitant diagnosis of another form of chronic angioedema, such as acquired C1inhibitor deficiency, HAE with normal C1-INH (also known as HAE type III),idiopathic angioedema, or angioedema associated with urticaria.

2. Use of therapies prescribed for the prevention of HAE attacks prior to Screening:

3. lanadelumab within 90 days

4. berotralstat within 21 days

5. all other prophylactic therapies, within 7 days

6. Any exposure to angiotensin-converting enzyme inhibitors or any estrogen containingmedications with systemic absorption (such as hormonal contraceptives or hormonereplacement therapy) within 28 days prior to Screening.

7. Any exposure to androgens (for example, stanozolol, danazol, oxandrolone,methyltestosterone, testosterone) within 7 days prior to Screening.