{"schema_version":"secwatch.filing_event.v1","accession":"0001619856-22-000039","form_type":"8-K","ticker":"CRBU","cik":"0001619856","company_name":"Caribou Biosciences, Inc.","filed_at":"2022-12-16T23:59:59+00:00","discovered_at":"2026-05-14T18:03:51.461614+00:00","generated_at":"2026-06-21T03:21:36.993709+00:00","sec_items":["5.02","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.1,"calibrated_materiality_score":0.1,"confidence":"high","headline":"Caribou appoints CFO Jason O'Byrne as principal accounting officer; controller Fischesser cedes role","bullets":["Jason V. O'Byrne, CFO, appointed principal accounting officer effective Dec 15, 2022.","Ryan Fischesser steps down as principal accounting officer but remains VP of Finance and Controller.","Fischesser is no longer an officer for Section 16 purposes as of Dec 15, 2022.","No new arrangements, family relationships, or material transactions tied to the change."],"urls":{"canonical":"https://secwatch.observer/filing/0001619856-22-000039","json":"https://secwatch.observer/filing/0001619856-22-000039.json","markdown":"https://secwatch.observer/filing/0001619856-22-000039.md","text":"https://secwatch.observer/filing/0001619856-22-000039.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1619856/000161985622000039/0001619856-22-000039-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1619856/000161985622000039/crbu-20221215.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-21T03:21:36.993709+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":"21c806cf57","claim":"Ryan Fischesser changed role as principal accounting officer at Caribou Biosciences, Inc..","evidence_excerpt":"The Company’s Vice President of Finance and Controller, Ryan Fischesser, who was previously serving as the Company’s principal accounting officer, will continue serving as the Company’s Vice President of Finance and Controller but not as the Company’s principal accounting officer, effective as of December 15, 2022.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1619856/000161985622000039/0001619856-22-000039-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"ceased to serve as"},{"label":"Role","value":"principal accounting officer"}],"fact_type":"executive_change"},{"claim_id":"66170de811","claim":"Jason V. O'Byrne was appointed as principal accounting officer at Caribou Biosciences, Inc..","evidence_excerpt":"On December 15, 2022, Caribou Biosciences, Inc. (the “Company”) appointed Jason V. O’Byrne, its Chief Financial Officer, as the Company’s principal accounting officer.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1619856/000161985622000039/0001619856-22-000039-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"principal accounting officer"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}