 11. Women of childbearing potential and men who are sexually active must be practicing a highly effective method of birth control during and after the study For females, these restrictions apply for 1 month after the last dose of ibrutinib and for 12 months after the last dose of Ofatumumab. For males, these restrictions apply for 3 months after the last dose of ibrutinib. Men must agree to not donate sperm during and after the study. 