OSF HealthCare completes first phase of acquiring St. Margaret’s assets Ryan Voyles 1 year ago Peoria-based OSF HealthCare said Thursday it has completed the first phase of its plan to acquire assets from St. Margaret’s Health.To access this content, you must purchase 1 Year Health News Illinois Subscription or 1 Year Group Subscription - Up to 5 Users, or log in if you are a member.