Medicare Advantage enrollment grew by about 232,000 lives during the 2022 Open Enrollment Period (OEP), according to CMS’s May data release and AIS’s Directory of Health Plans. As in the Annual Election Period (AEP), UnitedHealthcare dominated, holding 45.1% of the overall OEP gains, followed by CVS Health Corp.’s Aetna at 16.9% and Centene Corp at 13.5%. Among other large, publicly traded insurers, Cigna Corp. and Humana Inc. both flopped in the OEP, losing 12,600 and 4,200 members, respectively. Meanwhile, insurance startups Bright Health and Clover Health both made the top 20 despite recent financial challenges and questioned viability. See the top 25 OEP performers, plus their AEP results and current enrollment, in the chart below.