Icosavax, Inc., a biopharmaceutical company, develops vaccines against infectious diseases through virus-like particle (VLP) platform technology. Its lead product candidate IVX-A12, a respiratory syncytial virus (RSV) and human metapneumovirus (hMPV) VLP vaccine. The company also develops IVX-121, a vaccine candidate with RSV target and is under Phase 1/1b clinical trial; and IVX-241, a vaccine candidate with hMPV target. Icosavax, Inc. was incorporated in 2017 and is headquartered in Seattle, Washington. As of February 19, 2024, Icosavax, Inc. operates as a subsidiary of AstraZeneca PLC.