This was a single arm, prospective, multicentre and open-label, 96-week study to evaluate the treatment effectiveness of ofatumumab (OMB) in subjects with relapsing multiple sclerosis (RMS) transitioning from fumarate-based RMS approved therapies, such as dimethyl fumarate (DMF), diroximel fumarate (DRF), and monomethyl fumarate (MMF), or fingolimod due to breakthrough disease activity.