{"transactions":[{"id":886282,"issuer":{"id":6445,"kind":"organization","name":"Caribou Biosciences, Inc."},"owners":[{"id":65051,"kind":"person","name":"Albertson Tina M.","position":1,"cik":"0001917391","reported_name":"Albertson Tina M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Option to purchase Common Stock","published_at":"2026-02-24T20:53:47.000Z","date":"2026-02-20","kind":"grant","planned":true,"acquired":true,"shares":247500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"1/48 of the total number of 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, 2030, subject to the reporting person continuing to provide service to\nthe Issuer through each such vesting date."}],"balance_after":247500,"derivative":{"exercise_price":1.8,"expiration_date":"2036-02-19","underlying":"Common Stock","underlying_shares":247500},"source":{"system":"sec-edgar","filing":"0001917391-26-000002","document":"wk-form4_1771984424.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1917391/000191739126000002/wk-form4_1771984424.xml","form_type":"4"}},{"id":886281,"issuer":{"id":6445,"kind":"organization","name":"Caribou Biosciences, Inc."},"owners":[{"id":65051,"kind":"person","name":"Albertson Tina M.","position":1,"cik":"0001917391","reported_name":"Albertson Tina M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Common Stock","published_at":"2026-02-24T20:53:47.000Z","date":"2026-02-24","kind":"sale","planned":true,"acquired":false,"shares":1066,"price":1.96,"value":2089.36,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Reflects the number of shares of common stock that were sold in a \"sell-to-cover\" transaction for the sole purpose of\nsatisfying tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person and\ndoes not represent a discretionary trade by the reporting person. This transaction was made pursuant to a Rule 10b5-1 trading\nplan in the form of a durable sell-to-cover instruction adopted by the reporting person on August 12,  2024. The trading plan\nprovides for the automatic sale of shares of common stock necessary to satisfy the reporting person's tax withholding\nobligations incurred in connection with the vesting of RSUs."},{"field":"shares","element":"transactionShares","label":"F2","text":"Reflects the number of shares of common stock that were sold in a \"sell-to-cover\" transaction for the sole purpose of\nsatisfying tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person and\ndoes not represent a discretionary trade by the reporting person. This transaction was made pursuant to a Rule 10b5-1 trading\nplan in the form of a durable sell-to-cover instruction adopted by the reporting person on August 12,  2024. The trading plan\nprovides for the automatic sale of shares of common stock necessary to satisfy the reporting person's tax withholding\nobligations incurred in connection with the vesting of RSUs."}],"balance_after":68523,"source":{"system":"sec-edgar","filing":"0001917391-26-000002","document":"wk-form4_1771984424.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1917391/000191739126000002/wk-form4_1771984424.xml","form_type":"4"}},{"id":886280,"issuer":{"id":6445,"kind":"organization","name":"Caribou Biosciences, Inc."},"owners":[{"id":65051,"kind":"person","name":"Albertson Tina M.","position":1,"cik":"0001917391","reported_name":"Albertson Tina M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Common Stock","published_at":"2026-02-24T20:53:47.000Z","date":"2026-02-20","kind":"grant","planned":true,"acquired":true,"shares":55000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This reflects restricted stock units (\"RSUs\") that vest in four equal annual installments beginning on February 20, 2027, subject to the reporting person continuing to provide service to the Issuer through the applicable vesting dates. The RSUs will be\nsettled in stock within 30 days after each vesting date."}],"balance_after":69589,"source":{"system":"sec-edgar","filing":"0001917391-26-000002","document":"wk-form4_1771984424.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1917391/000191739126000002/wk-form4_1771984424.xml","form_type":"4"}},{"id":1254122,"issuer":{"id":6445,"kind":"organization","name":"Caribou Biosciences, Inc."},"owners":[{"id":65051,"kind":"person","name":"Albertson Tina M.","position":1,"cik":"0001917391","reported_name":"Albertson Tina M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Option to purchase Common Stock","published_at":"2025-02-21T20:20:34.000Z","date":"2025-02-20","kind":"grant","planned":false,"acquired":true,"shares":66137,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"25% of the options will vest upon the one-year anniversary of the grant date, February 20, 2026, and 1/48th will vest monthly thereafter over the 36-month period following the one-year cliff, subject to the reporting person's continued service to\nthe Issuer through the applicable vesting dates."}],"balance_after":66137,"derivative":{"exercise_price":1.41,"expiration_date":"2035-02-19","underlying":"Common Stock","underlying_shares":66137},"source":{"system":"sec-edgar","filing":"0001917391-25-000003","document":"wk-form4_1740187228.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1917391/000191739125000003/wk-form4_1740187228.xml","form_type":"4"}},{"id":1254121,"issuer":{"id":6445,"kind":"organization","name":"Caribou Biosciences, Inc."},"owners":[{"id":65051,"kind":"person","name":"Albertson Tina M.","position":1,"cik":"0001917391","reported_name":"Albertson Tina M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Common Stock","published_at":"2025-02-21T20:20:34.000Z","date":"2025-02-20","kind":"grant","planned":false,"acquired":true,"shares":14589,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This reflects restricted stock units (\"RSUs\") that vest in four equal annual installments beginning on February 20, 2026, subject to the reporting person's continued services to the Issuer through the applicable vesting dates. The RSUs will be\nsettled in stock within 30 days after each vesting date."}],"balance_after":14589,"source":{"system":"sec-edgar","filing":"0001917391-25-000003","document":"wk-form4_1740187228.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1917391/000191739125000003/wk-form4_1740187228.xml","form_type":"4"}},{"id":1428264,"issuer":{"id":6445,"kind":"organization","name":"Caribou Biosciences, Inc."},"owners":[{"id":65051,"kind":"person","name":"Albertson Tina M.","position":1,"cik":"0001917391","reported_name":"Albertson Tina M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Option to purchase Common Stock","published_at":"2024-08-20T16:07:04.000Z","date":"2024-08-19","kind":"grant","planned":false,"acquired":true,"shares":300000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"25% of the options will vest upon the one-year anniversary of the grant date, August 19, 2025, and 1/48th will vest monthly thereafter over the 36-month period following the one-year cliff, subject to the reporting person's continued service to the Issuer through the applicable vesting dates."}],"balance_after":300000,"derivative":{"exercise_price":2.18,"expiration_date":"2034-08-18","underlying":"Common Stock","underlying_shares":300000},"source":{"system":"sec-edgar","filing":"0001917391-24-000009","document":"wk-form4_1724184417.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1917391/000191739124000009/wk-form4_1724184417.xml","form_type":"4"}},{"id":1988243,"issuer":{"id":5757,"kind":"organization","name":"Lyell Immunopharma, Inc.","symbol":"LYEL"},"owners":[{"id":65051,"kind":"person","name":"Albertson Tina M.","position":1,"cik":"0001917391","reported_name":"Albertson Tina M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Option (right to buy)","published_at":"2023-02-28T18:19:25.000Z","date":"2023-02-24","kind":"grant","acquired":true,"shares":700000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"12.5% of the option shares shall vest on August 9, 2023, with the remaining option shares to vest in equal monthly installments over the following\nforty-two months."}],"balance_after":700000,"derivative":{"exercise_price":2.13,"expiration_date":"2033-02-23","underlying":"Common Stock","underlying_shares":700000},"source":{"system":"sec-edgar","filing":"0001209191-23-013848","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1917391/000120919123013848/doc4.xml","form_type":"4"}}]}