{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-26-077105","form_type":"8-K","ticker":"RNA","cik":"0002093101","company_name":"Atrium Therapeutics, Inc.","filed_at":"2026-02-26T23:59:59+00:00","discovered_at":"2026-05-14T18:02:37.243936+00:00","generated_at":"2026-05-15T23:53:46.756076+00:00","sec_items":["7.01","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.75,"calibrated_materiality_score":0.75,"confidence":"high","headline":"Atrium Therapeutics completes spin-off from Avidity; 15.5M shares distributed, trading begins Feb 27 under RNA","bullets":["Avidity distributed 15,514,966 Atrium shares at a ratio of 1 share per 10 Avidity shares; holds no equity interest after.","Atrium shares expected to begin trading on Nasdaq under symbol RNA on February 27, 2026.","Registration statement declared effective and spin-off consummated on February 26, 2026.","Novartis acquisition of Avidity expected to close on February 27, 2026, subject to conditions.","Atrium focused on early-stage precision cardiology programs ATR-1086 (phospholamban) and ATR-1072 (PRKAG2 syndrome)."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-26-077105","json":"https://secwatch.observer/filing/0001193125-26-077105.json","markdown":"https://secwatch.observer/filing/0001193125-26-077105.md","text":"https://secwatch.observer/filing/0001193125-26-077105.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/2093101/000119312526077105/0001193125-26-077105-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/2093101/000119312526077105/d14901d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-15T23:53:46.756076+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"}