Workforce intelligence data and corporate filings indicate that Lyell Immunopharma maintains a lean, specialized team of approximately 166 employees globally. This headcount reflects organizational adjustments and strategic streamlining over recent years to optimize operational efficiency, preserve cash runways, and focus core resources on advancing clinical-stage pipelines like ronde-cel and LYL273. The staff primarily consists of scientists, clinical researchers, laboratory technicians, and administrative professionals operating out of its headquarters and research facilities in South San Francisco.