{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-140329","form_type":"8-K","ticker":"SNSE","cik":"0001829802","company_name":"Sensei Biotherapeutics, Inc.","filed_at":"2025-06-13T23:59:59+00:00","discovered_at":"2026-05-14T18:02:49.998220+00:00","generated_at":"2026-05-19T08:59:29.564536+00:00","sec_items":["5.03","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.65,"calibrated_materiality_score":0.65,"confidence":"high","headline":"Sensei Biotherapeutics announces 1-for-20 reverse stock split effective June 16","bullets":["Reverse stock split at 1-for-20 ratio effective 5:00 p.m. ET on June 16, 2025.","Authorized shares reduced from 250,000,000 to 12,500,000; par value unchanged.","No fractional shares issued; stockholders receive cash payment in lieu.","Common stock trades on split-adjusted basis on Nasdaq Capital Market starting June 17, 2025.","Outstanding stock options, RSUs, and warrants proportionately adjusted."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-140329","json":"https://secwatch.observer/filing/0001193125-25-140329.json","markdown":"https://secwatch.observer/filing/0001193125-25-140329.md","text":"https://secwatch.observer/filing/0001193125-25-140329.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1829802/000119312525140329/0001193125-25-140329-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1829802/000119312525140329/d945713d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-19T08:59:29.564536+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":"ee29eeb3f58064f22db2386165f098295758b610","claim":"Sensei Biotherapeutics, Inc.: Filed Certificate of Amendment for a one-for-twenty reverse stock split and reduction of authorized shares from 250,000,000 to 12,500,000 (effective 2025-06-16).","evidence_excerpt":"On June 12, 2025, Sensei Biotherapeutics, Inc. (the “Company”) filed a Certificate of Amendment to its Amended and Restated Certificate of Incorporation (the “Amendment”) with the Secretary of State of the State of Delaware to effect a one-for-twenty (1-for-20) reverse stock split (the “Reverse Stock Split”) of its outstanding common stock and a reduction in the total number of authorized shares of its common stock from 250,000,000 to 12,500,000 (the “Shares Reduction”).","evidence_source":"SEC 8-K Item 5.03/5.05/5.06","evidence_url":"https://www.sec.gov/Archives/edgar/data/1829802/000119312525140329/0001193125-25-140329-index.htm","confidence":0.9,"family_label":"Governance Changes","details":[{"label":"Change","value":"charter amendment"},{"label":"Effective","value":"2025-06-16"}],"fact_type":"governance_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}