Study to Assess the Effect of Ofatumumab in Treatment Naïve, Very Early RRMS Patients Benchmarked Against Healthy Controls.

A participant is considered as achieved NEDA-3 if they were:

• relapse-free, defined as no confirmed relapses in month 6 to 18.
• 3-month clinical disability progression-free, defined as no clinical disability progression as measured by EDSS in month 6 to 18.
• MRI activity-free, defined as no Gd+ lesions on any MRI scan after Month 6, or new/enlarging T2 lesions compared to Month 6 on any MRI scan after Month 6 Expanded Disability Status Scale (EDSS) ranges from 0 to 10 with higher values indicating increased disability. As per protocol and SAP only evaluated on the ofatumumab participants.

Relapses are recurrences of a disease activity after a recovery. A confirmed MS relapse is one accompanied by a clinically relevant change in the EDSS , i.e. an increase of at least 0.5 points on the EDSS score, or an increase of 1 point on two functional scores (FSs) or 2 points on one FS, excluding changes involving bowel/bladder or cerebral FS compared to the previous available rating (the last EDSS rating that did not occur during a relapse). Expanded Disability Status Scale (EDSS) ranges from 0 to 10 with higher values indicating increased disability. Confirmation of MS relapse was done centrally.

As per protocol and SAP only evaluated on the ofatumumab participants.

ARR (participant-based) is calculated at the participant level as [(number of confirmed MS relapses in Months 6 to 18) / (number of days in Months 6 to 18)] x 365.25.

As per protocol and SAP only evaluated on the ofatumumab participants.

ARR (group-based) is calculated at the group level as [(total number of confirmed MS relapses in Months 6 to 18 for all participants within the ofatumumab-treated cohort) / (total number of days in Months 6 to 18 for all participants within the ofatumumab-treated cohort)] x 365.25.

As per protocol and SAP only evaluated on the ofatumumab participants.

3-month clinical disability progression-free was defined as no clinical disability progression as measured by EDSS (global assessment scale), where 3-month confirmed clinical disability progression was defined as an increase from Month 6 in EDSS sustained for at least 3 months.

If a participant fulfilled the clinical disability progression criteria based on the single EDSS assessment at Month 18, it was considered a confirmed clinical disability progression (sustainment for at least 3 months was not required).

If a participant died due to MS , it was considered a confirmed clinical disability progression regardless of the Month 6 EDSS or change in EDSS.

Expanded Disability Status Scale (EDSS) ranges from 0 to 10 with higher values indicating increased disability.

As per protocol and SAP only evaluated on the ofatumumab participants.

A participant is considered as achieved NEDA-Clinical if the participant has not had a confirmed MS relapse in Months 6 to 18 and no 3-month confirmed clinical disability progression in Months 6 to 18 (based on change from Month 6 in EDSS).

Expanded Disability Status Scale (EDSS) ranges from 0 to 10 with higher values indicating increased disability.

As per protocol and SAP only evaluated on the ofatumumab participants.

A participant is considered as achieved NEDA-radiological if the participant has had no Gd+ lesions on any MRI scan after Month 6, or new/enlarging T2 lesions compared to Month 6 on any MRI scan after Month 6 (MRI activity-free). Scheduled and unscheduled assessments are considered.

As per protocol and SAP only evaluated on the ofatumumab participants.

Change in the number of gadolinium enhancing lesions will be measured by Magnetic Resonance Imaging (MRI). Each MRI scan will be previewed by a local neuroradiologist. The quality of each scan performed will be assessed by a central MRI reading center.

Change in size of gadolinium enhancing lesions will be measured by Magnetic Resonance Imaging (MRI). Each MRI scan will be previewed by a local neuroradiologist. The quality of each scan performed will be assessed by a central MRI reading center.

Change in the number of new/enlarging T2 lesions will be measured by Magnetic Resonance Imaging (MRI). Each MRI scan will be previewed by a local neuroradiologist. The quality of each scan performed will be assessed by a central MRI reading center.

Change in size of T2 lesions will be measured by Magnetic Resonance Imaging (MRI). Each MRI scan will be previewed by a local neuroradiologist. The quality of each scan performed will be assessed by a central MRI reading center.

The NeuroQOL is a measurement system that evaluates and monitors the physical, mental, and social effects experienced by adults and children living with neurological conditions. The following domains will be measured.

Physical Health, Mental Health, Social Health. Scales can be scored by summing the values of the response to each item to develop a total raw score.

The PDDS is a standardized rating scale which is a self-assessment scale of functional disability in multiple sclerosis patients primarily based on ambulation. The questionnaire contains 1 question which is scored ranging from 0 (normal) to 8 (bedridden). A score of 0 to 2 indicates mild disability; a score of 3 to 5 indicates moderate disability; a score of 6 to 8 indicates severe disability.

Brain volume loss is a marker of progressive loss of brain structure and function. It is a predictor of disability progression. Evaluate the effect of ofatumumab vs healthy controls on 1) whole brain and regional atrophy measured at month 18/30 after re-baseline at 6 months; and 2) regional atrophy measured 18/30 months from Baseline

Adverse event monitoring should be continued following the last dose of study treatment until B cells are repleted. Repletion is defined as a concentration > the participant's baseline value or > the lower limit of normal, whichever is observed first. Other safety assessments (physical exam, vital signs, etc) that meet the definition of an adverse event or are considered clinically relevant by the investigator will be reported as an adverse event.

Change in the number of new unenhancing T1 lesions will be measured by Magnetic Resonance Imaging (MRI). Each MRI scan will be previewed by a local neuroradiologist. The quality of each scan performed will be assessed by a central MRI reading center.

Change in the size of T1 unenhancing lesions will be measured by Magnetic Resonance Imaging (MRI). Each MRI scan will be previewed by a local neuroradiologist. The quality of each scan performed will be assessed by a central MRI reading center.