{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-21-227378","form_type":"8-K","ticker":"CRBU","cik":"0001619856","company_name":"Caribou Biosciences, Inc.","filed_at":"2021-07-28T23:59:59+00:00","discovered_at":"2026-05-14T18:04:18.895838+00:00","generated_at":"2026-06-30T01:40:23.684180+00:00","sec_items":["3.02","5.02","5.03","8.01","9.01"],"event_type":"other_material","sentiment":"positive","materiality_score":0.85,"calibrated_materiality_score":0.85,"confidence":"high","headline":"Caribou Biosciences completes $304M IPO; sells 19M shares at $16 each","bullets":["Gross proceeds of $304M before underwriting discounts; underwriters have 30-day option for up to 2.85M additional shares.","All outstanding preferred stock (Series A, A-1, B, C) converted into 26,234,654 common shares automatically prior to IPO close.","Director Jeffrey Long-McGie resigned effective July 27, 2021, in connection with the IPO closing; no disagreement cited.","Adopted 2021 Equity Incentive Plan and 2021 Employee Stock Purchase Plan; entered amended employment agreements with four named officers.","Filed amended and restated certificate of incorporation and bylaws effective July 27, 2021."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-21-227378","json":"https://secwatch.observer/filing/0001193125-21-227378.json","markdown":"https://secwatch.observer/filing/0001193125-21-227378.md","text":"https://secwatch.observer/filing/0001193125-21-227378.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1619856/000119312521227378/0001193125-21-227378-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1619856/000119312521227378/d189230d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-30T01:40:23.684180+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":"68583595a7","claim":"Jeffrey Long-McGie resigned as Director at Caribou Biosciences, Inc..","evidence_excerpt":"Effective as of July 27, 2021, Mr. Jeffrey Long-McGie resigned from the Company’s board of directors in connection with the closing of the Offering.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1619856/000119312521227378/0001193125-21-227378-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"resigned"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}