A Study to Evaluate Efficacy and Long-term Safety of Oral Ozanimod in Chinese Participants With Moderately to Severely Active Ulcerative Colitis (UC)

Inclusion Criteria: Main Study: * Eligible participants must be Chinese. * Participant has had moderately to severely active UC diagnosed at least 3 months prior to first investigational product administration. Open-label Extension Period: * Participants who have completed the Week 10 Visit and are non-responders at Week 10. * Participants who have completed the Induction Period and entered the Maintenance Period experienced disease relapse during the Maintenance Period, or who have completed the Maintenance Period at Week 52. Exclusion Criteria: Main Study and Open-label Extension Period: * Participant has severe extensive colitis, diagnosis of CD, indeterminate colitis, presence or history of a fistula consistent with CD, microscopic colitis, radiation colitis, or ischemic colitis. Open-label Extension Period: * Participant has clinically relevant hepatic, neurological, pulmonary, ophthalmological, endocrine, psychiatric, or other major systemic disease making implementation of the protocol or interpretation of the study difficult or that would put the participant at risk by continuing the study or that would have required a participant to discontinue treatment were observed during the Induction Period or Maintenance Period. * Participant has clinically relevant cardiovascular conditions, including history or presence of recent myocardial infarction, unstable angina, stroke, transient ischemic attack, decompensated heart failure requiring hospitalization, Class III/IV heart failure, sick sinus syndrome, or severe untreated sleep apnea were observed during the Induction Period or Maintenance Period.