A Study Evaluating the Real World Experience of Participants Treated With BRIUMVI® (Ublituximab-xiiy) for Relapsing Multiple Sclerosis (RMS)

Who May Qualify: 1. Confirmed Multiple Sclerosis (MS) diagnosis. 2. Participants who have not received any BRIUMVI® (ublituximab-xiiy) infusion prior to study start. Participants who have been prescribed BRIUMVI® (ublituximab-xiiy) but have not yet received their first infusion on Day 1 of 150 milligrams (mg) can be included. Who Should NOT Join This Trial: 1. Have received any live or live-attenuated vaccines (including for varicella-zoster virus or measles) within 4 weeks prior to first BRIUMVI® (ublituximab-xiiy) administration or any non-live vaccines within 2 weeks prior to first BRIUMVI® (ublituximab-xiiy) administration. 2. Any active infection (e.g., active Hepatitis B virus \[HBV\]) 3. Concurrent participation in any interventional MS trials, or planned concurrent treatment with other Multiple Sclerosis Disease Modifying Therapy (MS DMT) during the study period. Always talk to your doctor about whether this trial is right for you.