ATRA ATARA BIOTHERAPEUTICS INC Business Restructuring 8-K Filing 2025 - Workforce Reduction On March 3, 2025, Atara Biotherapeutics announced it will cut its workforce by about 50% and stop developing ATA3219 and ATA3431, expecting to incur $3.0 million in severance costs. The workforce reduction is expected to be completed by June 2025.Get access to all SEC 8-K filings of the ATARA BIOTHERAPEUTICS INC