Prospective Study to Assess Disease Activity and Biomarkers in Minority Participants With Relapsing Multiple Sclerosis (RMS) After Initiation and During Treatment With Ocrelizumab

Inclusion Criteria: * Diagnosis of RMS with Expanded Disability Status Scale (EDSS) 0-5.5 at enrollment * Participants who self-identify as Black or African American or Hispanic/Latino American * Treatment-naïve or initiating first or second switch from receiving treatment with certain disease modifying therapies (DMTs) including interferon or glatiramer acetate or dimethyl fumarate (DMF); or siponimod; or fingolimod; or diroximel fumarate; or teriflunomide; or ozanimod; or natalizumab * For women of childbearing potential: agreement to remain abstinent (refrain from heterosexual intercourse) or use acceptable contraceptive methods during the treatment period and for 6 months after the final dose of ocrelizumab * Neurologically stable for at least 30 days prior to randomization and baseline assessments Exclusion Criteria: * Diagnosis of secondary progressive MS without relapses for at least 1 year (nonactive or inactive SPMS) * Primary Progressive Multiple Sclerosis (PPMS) * Participants with contraindication to gadolinium based contrast agent for MRI and participants who cannot tolerate MRI procedure * Infection Related * Cancer Related * Pregnant or lactating, or intending to become pregnant during the study * Other Medical Conditions * Known presence or history of other neurologic disorders * Vaccinations: Receipt of a live vaccine, or attenuated, or inactivated / component vaccine within 6 weeks prior to first administration of ocrelizumab * Laboratory: abnormalities or findings at screening