A Study of WIN378 in Participants With Moderate to Severe COPD (Sirius)

Inclusion Criteria: * Adults aged 40 to 80 years * Post-BD spirometry at screening FEV1/FVC \< 0.70 and FEV1 30-80% predicted * On stable triple inhaled therapy (ICS/LABA/LAMA) for ≥ 3 months * Former smoker (≥ 10 pack-year history) and abstinence from smoking for ≥ 6 months * Elevated eosinophil count * Weight/BMI within allowed range Exclusion Criteria: * Clinically significant pulmonary disease other than chronic obstructive pulmonary disease (COPD) * Clinically significant comorbid medical conditions or infections that, in the investigator's judgment, could affect participant safety or interfere with study conduct * Clinically significant cardiovascular disease * Recent respiratory infection or COPD exacerbation * Exposure to approved or experimental biologic therapies for COPD with less than 5 half-life washout period * Pregnancy or breastfeeding * Smoking or diagnosed substance use disorder * Any condition or circumstance that, in the investigator's opinion, would make participation unsafe or compromise study integrity