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Inclusion Criteria:

* Male and female participants 2 to \< 18 years of age with a diagnosis of PNH confirmed by high-sensitivity flow cytometry with red blood cells (RBCs) and with white blood cells granulocytes/monocytes clone size ≥ 10%. The minimum body weight for patients in Cohort 1 is 35 kg.
* Patients being treated with anti-C5 therapy and who have been on a stable regimen (dose and interval) for at least 6 months prior to enrollment, may be screened and enrolled in the study and switched to iptacopan irrespective of their anemia and hemolysis status, at the discretion of the Principal Investigator.
* Patients who are anti-C5 treatment naive: mean hemoglobin level \< 10 g/dL confirmed by central laboratory assessment during screening.
* Patients who are anti-C5 treatment naive: lactate dehydrogenase (LDH) \> 1.5 × upper limit of normal (ULN) documented by at least 2 laboratory measurements 2 to 6 weeks apart during the screening period, one of which is to be done by the central lab.
* Vaccination against Neisseria meningitidis and Streptococcus pneumoniae infection is required prior to the start of study treatment. If the participant has not been previously vaccinated, or if a booster is required, vaccine should be given according to local guidelines at least 2 weeks prior to first study drug administration. If study treatment has to start earlier than 2 weeks post-vaccination, prophylactic antibiotic treatment should be initiated.
* Vaccination against Haemophilus influenzae is recommended, according to local guidelines, at least 2 weeks before iptacopan.

Exclusion Criteria:

* History of hypersensitivity to the study drug or its excipients or to drugs of similar chemical classes.
* Known or suspected hereditary complement deficiency at screening.
* History of hematopoietic stem cell transplantation (HSCT) or scheduled for HSCT within 52 weeks from enrollment into the study (Day 1).
* Patients with laboratory evidence of bone marrow failure (reticulocytes \< 100 x 10 to the ninth/L; platelets \< 30 × 10 to the ninth/L; neutrophils \< 0.5 × 10 to the ninth/L).
* Active systemic bacterial, viral (including COVID-19), or fungal infection within 14 days prior to study drug administration.
* Presence of fever ≥ 38 °C (100.4 °F) within 7 days prior to study drug administration.

Other protocol-defined inclusion/exclusion criteria may apply.

• Atlanta, Georgia, United States
• New Brunswick, New Jersey, United States
• Philadelphia, Pennsylvania, United States
• Memphis, Tennessee, United States
• Brasília, Federal District, Brazil
• Natal, Rio Grande do Norte, Brazil
• Porto Alegre, Rio Grande do Sul, Brazil
• Santo André, São Paulo, Brazil
• São Paulo, São Paulo, Brazil
• São Paulo, São Paulo, Brazil
• Cali, Valle del Cauca Department, Colombia
• Cologne, North Rhine-Westphalia, Germany
• Berlin, Germany
• Genova, GE, Italy
• Utrecht, Netherlands