The main objective of the study is to evaluate the safety and efficacy of ALXN1830 compared to placebo in adult participants with warm autoimmune hemolytic anemia (WAIHA).
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Key Inclusion Criteria: * Primary or secondary WAIHA, diagnosed at least 6 weeks prior to Screening * Failed or not tolerated at least 1 prior WAIHA treatment regimen, for example, corticosteroids, rituximab, azathioprine, cyclophosphamide, cyclosporine, mycophenolate mofetil, danazol, or vincristine * Hemoglobin \< 10 g/dL and ≥ 6 g/dL * Positive direct antiglobulin test (Coombs) (IgG positive, complement C3 \[C3\] positive or negative) * Evidence of active hemolysis including any of the following: a) Lactate dehydrogenase (LDH) \> upper limit of normal (ULN), b) Haptoglobin \< lower limit of normal (LLN), c) Indirect bilirubin \> ULN * Total IgG \> 500 mg/dL Key Exclusion Criteria: * Human immunodeficiency virus (HIV) infection (positive HIV-1 or HIV-2 antibody test) * Positive hepatitis B surface antigen (HBsAg) or hepatitis C antibody test