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The prerequisite for participation in this observational study is the independent decision of the treating physician and patient to start an approved injectable or oral DMT for RMS as routine medical treatment. This decision must have been made prior to enrollment in this study. Cohort 1: The prospective observational period per patient in the core part will be up to approx. two years from the time of consent (2 years +2 months visit window). If a patient re-consents to the extension part, then the prospective extension observational period will be additional approx. two years, resulting in a total observational period (prospectively for the core and extension part \& retrospectively for the potential gap between core and extension part) of approx. 4 years (+ 2 month visit window). Cohort 2: The prospective observational period per patient will be up to approx. two years from the time of consent (2 years + 2 months visit window). The observational period will not be dictated by the protocol. The follow-up documentation will take place at a frequency defined as per investigator's discretion. The diagnostic or monitoring procedures are only those ordinarily applied to the therapeutic strategy and to routine clinical care, can be performed as telemedicine visits and will take place as per investigator's discretion.

Prospective, primary data will be collected from patients with sNfL outcomes in the context of switching to ofatumumab or continuing their current therapy. Data collection will cover a maximum period of 24 months. The observational period will not be dictated by the protocol. Baseline and follow-up visits will take place at a frequency defined as per Investigator´s discretion following clinical routine. The diagnostic or monitoring procedures are only those ordinarily applied to therapeutic strategy and routine clinical care. During the observation phase of the study, data will be collected according to standard of care as recommended by KKNMS (Competence Network Multiple Sclerosis in Germany). Eligible participants for the study are patients who have received treatment with category 1 DMTs and those who have included sNfL into their treatment decision-making process. These patients have the option to either continue their current DMT or switch to ofatumumab. According to local treatment guidelines, DMT category 1 include dimethylfumarate/diroximelfumarate, glatirameroids, Interferon beta and teriflunomide. The decision to switch to ofatumumab or to continue the current DMT category 1 therapy must be made by the treating physician independently of the decision to enroll the patient in the study.

The main purpose of the study is to evaluate participant satisfaction after administration of ocrelizumab subcutaneous (SC) after 12 months using the therapy administration satisfaction questionnaire subcutaneous (TASQ-SC).