{"transactions":[{"id":890922,"issuer":{"id":6445,"kind":"organization","name":"Caribou Biosciences, Inc."},"owners":[{"id":65438,"kind":"person","name":"Zheng Ran","position":1,"cik":"0001885914","reported_name":"Zheng Ran","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Option to purchase Common Stock","published_at":"2026-02-20T17:28:17.000Z","date":"2026-02-20","kind":"grant","planned":false,"acquired":true,"shares":45000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"One-twelfth of the shares subject to this option will vest on each monthly anniversary of the grant date such that the option will be fully vested on February 20, 2027, subject to the reporting person continuing to provide service to the Issuer through each such vesting date."}],"balance_after":45000,"derivative":{"exercise_price":1.8,"expiration_date":"2036-02-19","underlying":"Common Stock","underlying_shares":45000},"source":{"system":"sec-edgar","filing":"0001885914-26-000002","document":"wk-form4_1771626495.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1885914/000188591426000002/wk-form4_1771626495.xml","form_type":"4"}},{"id":1253312,"issuer":{"id":6445,"kind":"organization","name":"Caribou Biosciences, Inc."},"owners":[{"id":65438,"kind":"person","name":"Zheng Ran","position":1,"cik":"0001885914","reported_name":"Zheng Ran","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Option to purchase Common Stock","published_at":"2025-02-21T20:17:40.000Z","date":"2025-02-20","kind":"grant","planned":false,"acquired":true,"shares":40500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"One-twelfth of the shares subject to this option will vest on each monthly anniversary of the grant date such that the option will be fully vested on February 20, 2026, subject to the reporting person continuing to provide service to the Issuer\nthrough each such vesting date."}],"balance_after":40500,"derivative":{"exercise_price":1.41,"expiration_date":"2035-02-19","underlying":"Common Stock","underlying_shares":40500},"source":{"system":"sec-edgar","filing":"0001885914-25-000003","document":"wk-form4_1740187054.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1885914/000188591425000003/wk-form4_1740187054.xml","form_type":"4"}},{"id":1625707,"issuer":{"id":6445,"kind":"organization","name":"Caribou Biosciences, Inc."},"owners":[{"id":65438,"kind":"person","name":"Zheng Ran","position":1,"cik":"0001885914","reported_name":"Zheng Ran","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Option to purchase Common Stock","published_at":"2024-02-22T17:12:50.000Z","date":"2024-02-20","kind":"grant","planned":false,"acquired":true,"shares":39500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"One-twelfth of the shares subject to this option will vest on each monthly anniversary of the grant date such that the option will be fully vested on February 20, 2025, subject to the reporting person continuing to provide service to the Issuer through each such vesting\ndate."}],"balance_after":39500,"derivative":{"exercise_price":6.81,"expiration_date":"2034-02-19","underlying":"Common Stock","underlying_shares":39500},"source":{"system":"sec-edgar","filing":"0001628280-24-006416","document":"wk-form4_1708639949.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1885914/000162828024006416/wk-form4_1708639949.xml","form_type":"4"}},{"id":1996285,"issuer":{"id":6445,"kind":"organization","name":"Caribou Biosciences, Inc."},"owners":[{"id":65438,"kind":"person","name":"Zheng Ran","position":1,"cik":"0001885914","reported_name":"Zheng Ran","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Option to purchase Common Stock","published_at":"2023-02-23T17:09:04.000Z","date":"2023-02-21","kind":"grant","acquired":true,"shares":21500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"One-twelfth of the shares subject to this option will vest on each monthly anniversary of the grant date such that the option will be fully vested on February 21, 2024,  subject to the reporting person continuing to provide service to the Issuer through each such vesting date."}],"balance_after":21500,"derivative":{"exercise_price":6.12,"expiration_date":"2033-02-20","underlying":"Common Stock","underlying_shares":21500},"source":{"system":"sec-edgar","filing":"0001619856-23-000019","document":"wf-form4_167719010634615.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1885914/000161985623000019/wf-form4_167719010634615.xml","form_type":"4"}},{"id":2462769,"issuer":{"id":6445,"kind":"organization","name":"Caribou Biosciences, Inc."},"owners":[{"id":65438,"kind":"person","name":"Zheng Ran","position":1,"cik":"0001885914","reported_name":"Zheng Ran","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Option to purchase Common Stock","published_at":"2021-12-21T17:43:44.000Z","date":"2021-12-20","kind":"grant","acquired":true,"shares":13750,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"One-twelfth of the shares subject to this option will vest on each monthly anniversary of the grant date such that the option will be fully vested on December 20, 2022, subject to the reporting person continuing to provide service to the Issuer through each such vesting date."}],"balance_after":13750,"derivative":{"exercise_price":15.16,"expiration_date":"2031-12-19","underlying":"Common Stock","underlying_shares":13750},"source":{"system":"sec-edgar","filing":"0001209191-21-070829","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1885914/000120919121070829/doc4.xml","form_type":"4"}},{"id":2552413,"issuer":{"id":6445,"kind":"organization","name":"Caribou Biosciences, Inc."},"owners":[{"id":65438,"kind":"person","name":"Zheng Ran","position":1,"cik":"0001885914","reported_name":"Zheng Ran","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2021-10-04T16:10:30.000Z","date":"2021-10-01","kind":"grant","acquired":true,"shares":44000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option becomes exercisable in three equal annual installments beginning October 1, 2022."}],"balance_after":44000,"derivative":{"exercise_price":22.31,"expiration_date":"2031-09-30","underlying":"Common Stock","underlying_shares":44000},"source":{"system":"sec-edgar","filing":"0001209191-21-058926","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1885914/000120919121058926/doc4.xml","form_type":"4"}}]}