{"transactions":[{"id":4639647,"issuer":{"id":5757,"kind":"organization","name":"Lyell Immunopharma, Inc.","symbol":"LYEL"},"owners":[{"id":183175,"kind":"person","name":"Aguirre Jarrad Mattieu","position":1,"cik":"0002150331","reported_name":"Aguirre Jarrad Mattieu","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Common Stock","published_at":"2026-10-13T21:17:56.000Z","date":"2026-10-12","kind":"sale","planned":false,"acquired":false,"shares":422,"price":8.63,"value":3641.86,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares automatically sold to cover tax withholding obligation from settlement of vested restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported above reflects the weighted average price of the shares sold. The sale price ranged from $8.54 to $8.63 per share. Upon request from the SEC staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information\nregarding the number of shares sold at each separate price within the range set forth in this Form 4."}],"balance_after":19857,"source":{"system":"sec-edgar","filing":"0002150331-26-000003","document":"form4-10132026_091052.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2150331/000215033126000003/form4-10132026_091052.xml","form_type":"4"}},{"id":4615275,"issuer":{"id":5757,"kind":"organization","name":"Lyell Immunopharma, Inc.","symbol":"LYEL"},"owners":[{"id":183175,"kind":"person","name":"Aguirre Jarrad Mattieu","position":1,"cik":"0002150331","reported_name":"Aguirre Jarrad Mattieu","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Medical Officer"}}],"security":"Option (right to buy)","published_at":"2026-09-10T23:31:56.000Z","date":"2026-09-10","kind":"grant","planned":false,"acquired":true,"shares":47500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"12.5% of the option shares will vest on February 28, 2027, with the remaining option shares to vest in equal monthly installments over the following 42 months, subject to the reporting person providing service through the applicable vesting date."}],"balance_after":47500,"derivative":{"exercise_price":12.2,"expiration_date":"2036-09-09","underlying":"Common Stock","underlying_shares":47500},"source":{"system":"sec-edgar","filing":"0002150331-26-000002","document":"form4-09102026_110951.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2150331/000215033126000002/form4-09102026_110951.xml","form_type":"4"}}]}