A Phase III, Non-Inferiority, Randomized, Open-Label, Parallel Group, Multicenter Study To Investigate The Pharmacokinetics, Pharmacodynamics, Safety And Radiological And Clinical Effects Of Subcutaneous Ocrelizumab Versus Intravenous Ocrelizumab In Patients With Multiple Sclerosis

Inclusion Criteria: * Diagnosis of PPMS or RMS according to the revised McDonald 2017 criteria (Thompson et al. 2018) * EDSS score, 0-6.5, inclusive, at screening * Neurological stability for ≥30 days prior to both screening and baseline * Disease duration from onset of MS symptoms of less than 15 years for patients with EDSS score \<2.0 at screening * For females participants, without reproductive potential may be enrolled if post-menopausal, unless receiving a hormonal therapy for menopause or if surgically sterile * For females of childbearing potential, agreement to remain abstinent or use adequate contraceptive methods Exclusion Criteria: * Any known or suspected active infection at screening or baseline (except nailbed infections), or any major episode of infection requiring hospitalization or treatment with IV anti microbials within 8 weeks prior to and during screening or treatment with oral anti microbials within 2 weeks prior to and during screening * History of confirmed or suspected progressive multifocal leukoencephalopathy (PML) * History of cancer, including hematologic malignancy and solid tumors, within 10 years of screening * Immunocompromised state * Receipt of a live-attenuated vaccine within 6 weeks prior to randomization Influenza vaccination is permitted if the inactivated vaccine formulation is administered * Inability to complete an MRI or contraindication to gadolinium administration * Contraindications to mandatory premedications for IRRs, including closed-angle glaucoma for antihistamines * Known presence of other neurologic disorders * Any concomitant disease that may require chronic treatment with systemic corticosteroids or immunosuppressants during the course of the study * Significant, uncontrolled disease, such as cardiovascular, pulmonary, renal, hepatic, endocrine or gastrointestinal, or any other significant disease that may preclude patient from participating in the study * History of or currently active primary or secondary (non-drug-related) immunodeficiency * Pregnant or breastfeeding, or intending to become pregnant during the study and 6 or 12 months * Lack of peripheral venous access * History of alcohol or other drug abuse within 12 months prior to screening * Treatment with any investigational agent within 24 weeks prior to screening or 5 half-lives of the investigational drug (whichever is longer), or treatment with any experimental procedure for MS (e.g., treatment for chronic cerebrospinal venous insufficiency) * Participants who have previously received anti-CD20s if the last treatment was less than 2 years before screening, and/or if B-cell count is below lower limit of normal, and/or the discontinuation of the treatment was due to safety reasons or lack of efficacy * Previous treatment with cladribine, atacicept, and alemtuzumab * Previous treatment with fingolimod, siponimod, ponesimod, or ozanimod within 6 weeks of baseline * Previous treatment with interferons beta (1a or 1b), or glatiramer acetate within 2 weeks of baseline * Previous treatment with natalizumab within 4.5 months of baseline * Treatment with mitoxantrone within 2 years prior to baseline visit or evidence of cardiotoxicity following mitoxantrone use or a cumulative lifetime dose of more than 60 mg/m2 * Previous treatment with any other immunomodulatory or immunosuppressive medication not already listed above without appropriate washout as described in the applicable local label. * If the washout requirements are not described in the applicable local label, then the wash out period must be 5 times the half-life of the medication. The PD effects of the previous medication must also be considered when determining the required time for washout. * Any previous treatment with bone marrow transplantation and hematopoietic stem cell transplantation * Any previous history of transplantation or anti-rejection therapy * Treatment with IV Ig or plasmapheresis within 12 weeks prior to randomization * Systemic corticosteroid therapy within 4 weeks prior to screening * Positive screening tests for active, latent, or inadequately treated hepatitis B * Sensitivity or intolerance to any ingredient (including excipients) of ocrelizumab * Any additional exclusionary criterion as per ocrelizumab (Ocrevus®) local label, if more stringent than the above