Moderna, Inc. is an American pharmaceutical and biotechnology company based in Cambridge, Massachusetts, that focuses on RNA therapeutics, primarily mRNA vaccines. These vaccines use a copy of a molecule called messenger RNA to carry instructions for proteins to produce an immune response. The company's name is derived from the terms "modified", "RNA", and "modern". The company's commercial products are the Moderna COVID-19 vaccine sold under the brand names Spikevax and Mnexspike, a respiratory syncytial virus vaccine sold under the brand name Mresvia, and an influenza vaccine sold under the brand name Mflusiva. The company has 44 treatment and vaccine candidates, of which 37 have entered clinical trials. Candidates include possible vaccines for influenza, HIV, Epstein–Barr virus, the Nipah virus, chikungunya, human metapneumovirus, varicella zoster virus, as well as a cytomegalovirus vaccine, a Zika virus vaccine funded by the Biomedical Advanced Research and Development Authority, and three cancer vaccines. In 2026, Time ranked Moderna as number one in their World's Most Impactful Companies list.