ATRA ATARA BIOTHERAPEUTICS INC Capital Structure Changes 8-K Filing 2025 - Rights Offerings On May 14, 2025, Atara Biotherapeutics announced a public offering of 834,237 shares at $6.61 each and appointed two new board members, which is expected to close on May 16, 2025.Get access to all SEC 8-K filings of the ATARA BIOTHERAPEUTICS INC