Registry of Participants With Generalized Myasthenia Gravis Treated With Alexion C5 Inhibition Therapies (C5ITs)

Who May Qualify: 1. Participants with a diagnosis of gMG who are treated with Alexion C5IT at the time of enrollment, including patients previously treated with Soliris or Ultomiris and withdrawn from treatment. 2. Capable of giving signed willing to sign a consent form, which includes compliance with the protocol requirements and restrictions. 3. Participants must have myasthenia gravis historical data, such as MG-ADL and MGFA class, available to be enrolled in the Registry. Who Should NOT Join This Trial: 1\. Participants currently enrolled in an Alexion-sponsored interventional clinical study for treatment of gMG cannot be enrolled in the Alexion gMG Registry while enrolled/participating in the clinical study for gMG therapy. Always talk to your doctor about whether this trial is right for you.