Inclusion Criteria:
- At least 18 years of age - Sporadic ALS diagnosed as definite, probable, or laboratory-supported probable as defined by the revised El Escorial criteria - Slow vital capacity (SVC) ≥60% of the predicted value at screening - Onset of ALS symptoms within 72 weeks (18 months) prior to screening - Total ALSFRS-R score of ≥30 at screening - Have vaccination within 5 years against Streptococcus pneumoniae, Neisseria meningitidis (types A, C, W, Y, and B), and Haemophilus influenzae (type B) or agree to receive vaccination Exclusion Criteria:
- Confirmed or suspected other causes of neuromuscular weakness - Diagnosed with another neurodegenerative disease (examples include Parkinson's disease and Huntington's disease) - Significant pulmonary disorder not attributed to ALS (eg, chronic obstructive pulmonary disease, pulmonary fibrosis, cystic fibrosis, pulmonary arterial hypertension) - If taking riluzole, participant must be on a stable dose for 30 days prior to the start of the screening period. Use of riluzole is not required for participation.
- If taking edaravone, participant must be on a stable dose for 60 days prior to the start of the screening period. Use of edaravone is not required for participation.
- Participation in any other investigational drug trial or exposure to other investigational agent, device, or procedure within 30 days or within 5-half lives of the treatment (whichever is longer) prior to the start of the screening period or during study participation - Use of any other complement inhibitor within 30 days or within 5-half lives of the treatment (whichever is longer) prior to the start of the screening period or during study participation

• Apellis Pharmaceuticals, Inc.

NCT04579666 (First Published: 9/22/2020)