⁃ United States of America (USA) specific inclusion criterion:

⁃ \- Participant must be 12 to \<18 years of age at the time of signing the Informed consent/assent according to local regulation

⁃ Rest of world (ROW) specific inclusion criterion:

⁃ \- Participant must be 2 to \<18 years of age at the time of signing the Informed consent/assent according to local regulation

⁃ Global inclusion criteria:

• Participant has a diagnosis of generalized myasthenia gravis (gMG) confirmed by a prior positive serologic test result to acetylcholine receptor (AChR) prior to Screening

• Participant meets the criteria as defined by the Myasthenia Gravis Foundation of America (MGFA) Clinical Classification II to IV at Screening

• Participants with gMG, including:

• An MG-activities of daily living (MG-ADL) total score of 6 or more in adolescents from 12 years to \<18 years of age at Screening

• Documented weakness in at least 1 limb, neck, or bulbar muscle in children from 2 years to \<12 years of age at Screening (does not apply to US)

• Documented vaccination against meningococcal infections within 3 years prior to study start. If not fully vaccinated, participants must receive appropriate prophylactic antibiotic treatment until at least 2 weeks after the initial dose of vaccine(s)