This fact sheet, using data from the Urban Institute’s Coronavirus Tracking Survey, finds 3.1 million adults lost employer-sponsored health insurance (ESI) between March/April and September 2020 – but these losses were not matched by a corresponding increase in uninsurance. The public and private health insurance coverage options bolstered by the Affordable Care Act (ACA) are mitigating the impact of ESI losses during the COVID-19 pandemic. However, the California v. Texas lawsuit the Supreme Court will hear on November 10, 2020, could put the protections offered by the ACA at risk.