Few stocks have been as resilient as UnitedHealth Group (UNH 8.14%). The company operates the largest health insurance business in the U.S. It runs the second biggest pharmacy benefits manager (PBM). And UnitedHealth Group has a fast-growing healthcare technology and services unit with Optum. However, UnitedHealthGroup just hit a five-year low. Shares of the healthcare giant have plunged more than 50% below the peak set in late 2024. Here are five things investors need to know. 1. Pulling financial guidance ...