Atara Biotherapeutics, Inc. (ATRA) Insider Trading Activity

Atara Biotherapeutics, Inc., an off-the-shelf T-cell immunotherapy company, develops treatments for patients with cancer, autoimmune, and viral diseases in the United States. It is developing tabelecleucel, a T-cell immunotherapy that is Phase 3 clinical trials for the treatment of epstein-barr virus (EBV) driven post-transplant lymphoproliferative disease, as well as hematologic and solid tumors, including nasopharyngeal carcinoma. The company is also developing next-generation CAR T immunotherapies for patients with hematologic malignancies and solid tumors, including ATA2271 and ATA3271 for mesothelin; and ATA2431 and ATA3219 for B-cell malignancies, as well as ATA188 for the treatment of multiple sclerosis. In addition, it develops ATA368 program for patients with human papillomavirus associated cancers. Atara Biotherapeutics, Inc. has a license agreement with Memorial Sloan Kettering Cancer Center; license, and research and development collaboration agreement with QIMR Berghofer Medical Research Institute; and strategic collaboration with H. Lee Moffitt Cancer Center, as well as Bayer AG for mesothelin-targeted CAR T-cell therapies for solid tumors. The company was incorporated in 2012 and is headquartered in South San Francisco, California.

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Over the last 12 months, insiders at Atara Biotherapeutics, Inc. have bought $856,795 and sold $669,698 worth of Atara Biotherapeutics, Inc. stock.

On average, over the past 5 years, insiders at Atara Biotherapeutics, Inc. have bought $517,350 and sold $919,904 worth of stock each year.

Highest buying activity among insiders over the last 12 months: Panacea Innovation Ltd (10 percent owner) — $856,795.

The last purchase of 55,000 shares for transaction amount of $670,423 was made by Panacea Innovation Ltd (10 percent owner) on 2025‑08‑15.