Managed-care stocks are looking healthier again. Humana stock, One Medical stock, UnitedHealth stock, Centene stock and Cigna stock are your stocks to watch this weekend. Humana, fueled by Medicare Advantage growth, moved into buy range on Thursday and built on those gains Friday. Ditto for One Medical stock, though it's now extended from its IPO base. San Francisco-based 1Life HealthCare, which operates One Medical clinics, reported impressive membership trends late Wednesday.