{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-24-237582","form_type":"8-K","ticker":"ATRA","cik":"0001604464","company_name":"Atara Biotherapeutics, Inc.","filed_at":"2024-10-15T23:59:59+00:00","discovered_at":"2026-05-14T18:03:08.944986+00:00","generated_at":"2026-05-30T14:35:28.473179+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.4,"calibrated_materiality_score":0.4,"confidence":"high","headline":"Atara Biotherapeutics appoints Eric Hyllengren as COO, retains CFO role","bullets":["Eric Hyllengren appointed Chief Operating Officer effective Oct 14, 2024, while continuing as CFO.","Salary increased to $520,000 per year in connection with the promotion.","Hyllengren has been CFO since April 2023 and with Atara since 2018."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-24-237582","json":"https://secwatch.observer/filing/0001193125-24-237582.json","markdown":"https://secwatch.observer/filing/0001193125-24-237582.md","text":"https://secwatch.observer/filing/0001193125-24-237582.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1604464/000119312524237582/0001193125-24-237582-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1604464/000119312524237582/d729291d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-30T14:35:28.473179+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"24cd0757e2","claim":"Eric Hyllengren was appointed as Chief Operating Officer at Atara Biotherapeutics, Inc..","evidence_excerpt":"On October 14, 2024, the Board of Directors (the “Board”) of Atara Biotherapeutics, Inc. (the “Company”) appointed Eric Hyllengren to serve as the Company’s Chief Operating Officer, in addition to his role as the Company’s Chief Financial Officer.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1604464/000119312524237582/0001193125-24-237582-index.htm","confidence":1.0,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Chief Operating Officer"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}