Legal Insider Trading Data | Free and Professional Subscription Services | Insider Insights urn:uuid:e9d992c1-0414-315f-b989-7f7daabcb82c 2026-05-12T20:58:42-04:00 Jonathan Moreland Profit from legal insider trading. InsiderInsights.com provides free insider trading data tools and resources, and professional grade subscription based real time Form 4 data, analysis and services ATRA: PANACEA INNOVATION LTD (BO) Sold (S) 313,446 Shares of ATARA BIOTHERAPEUTICS INC for $10.10 on 5/7 urn:uuid:b49b377d-9902-8c16-5722-b2361affe056 2026-05-11T18:45:04-04:00 ATRA: ECOR1 CAPITAL LLC (BO) Bought (B) 507,407 Shares of ATARA BIOTHERAPEUTICS INC for $9.35 on 5/7 urn:uuid:6dad022a-0a39-6e22-90a8-4b384f7bcfb1 2026-05-11T17:34:20-04:00 ATRA: ECOR1 CAPITAL LLC (BO) Filed a Form 3, Becoming a Registered Insider at ATARA BIOTHERAPEUTICS INC With Initial Indirect Holdings of 1.0mm urn:uuid:e1991575-d6a3-ec31-64c0-08aa074d410e 2026-05-11T17:33:40-04:00 ATRA: PANACEA INNOVATION LTD (BO) Exercised 259,163 Options (OE*) of ATARA BIOTHERAPEUTICS INC for $0.00 on 3/17, and Kept Some urn:uuid:d11a0b59-7ca1-5be8-ff31-912fe6fab655 2026-03-19T16:30:10-04:00 ATRA: NGUYEN ANHCO (PR,CEO,DIR) Acquired (JB) 81,100 Shares of ATARA BIOTHERAPEUTICS INC for $0.00 on 3/9 urn:uuid:97b0b2c2-88ca-c7a1-acd8-97d9259dddbf 2026-03-11T17:46:05-04:00 ATRA: GRANT HUERTA YANINA (CAO) Acquired (JB) 20,300 Shares of ATARA BIOTHERAPEUTICS INC for $0.00 on 3/9 urn:uuid:d32a0f37-f8f4-afdc-e163-d4588cb01619 2026-03-11T17:45:38-04:00 ATRA: GRANT HUERTA YANINA (CAO) Sold (S) 2,104 Shares of ATARA BIOTHERAPEUTICS INC for $5.08 on 3/2 urn:uuid:fdff692c-8f9f-b5ab-2990-eab2e190a01a 2026-03-04T16:28:21-05:00 ATRA: NGUYEN ANHCO (PR,CEO,DIR) Sold (S) 2,996 Shares of ATARA BIOTHERAPEUTICS INC for $5.08-$5.09 on 3/2 urn:uuid:64e8684c-271c-9cd5-f6a8-db0943fe7af8 2026-03-04T16:28:09-05:00 ATRA: PANACEA INNOVATION LTD (BO) Sold (S) 80,554 Shares of ATARA BIOTHERAPEUTICS INC for $6.07 on 1/12 urn:uuid:74d6490f-0983-2704-4942-ea76b876ea37 2026-01-14T21:16:25-05:00