{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-121824","form_type":"8-K","ticker":"ATRA","cik":"0001604464","company_name":"Atara Biotherapeutics, Inc.","filed_at":"2025-05-16T23:59:59+00:00","discovered_at":"2026-05-14T18:02:48.983364+00:00","generated_at":"2026-05-21T03:17:03.908725+00:00","sec_items":["8.01","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.65,"calibrated_materiality_score":0.65,"confidence":"high","headline":"Atara Biotherapeutics raises ~$16M in registered direct offering of common stock and pre-funded warrants","bullets":["Gross proceeds ~$16M from 834,237 shares at $6.61/share and pre-funded warrants for 1,587,108 shares at $6.6099.","Pre-funded warrants have exercise price $0.0001/share, exercisable immediately, no expiration.","Net proceeds to fund BLA approval activities for tab-cel and for working capital.","Underwriting agreement with TD Securities; offering expected to close May 16, 2025.","30-day lock-up on issuance and sale of company securities post-closing."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-121824","json":"https://secwatch.observer/filing/0001193125-25-121824.json","markdown":"https://secwatch.observer/filing/0001193125-25-121824.md","text":"https://secwatch.observer/filing/0001193125-25-121824.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1604464/000119312525121824/0001193125-25-121824-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1604464/000119312525121824/d45771d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-21T03:17:03.908725+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":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}