{"cik":"0001896415","entityType":"other","sic":"","sicDescription":"","ownerOrg":"","insiderTransactionForOwnerExists":1,"insiderTransactionForIssuerExists":0,"name":"Banks Sonja","tickers":[],"exchanges":[],"ein":null,"lei":null,"description":"","website":"","investorWebsite":"","category":"","fiscalYearEnd":null,"stateOfIncorporation":"","stateOfIncorporationDescription":"","addresses":{"mailing":{"street1":"C/O FULCRUM THERAPEUTICS, INC.","street2":"26 LANDSDOWNE STREET","city":"CAMBRIDGE","stateOrCountry":"MA","zipCode":"02139","stateOrCountryDescription":"MA","isForeignLocation":0,"foreignStateTerritory":null,"country":null,"countryCode":null},"business":{"street1":null,"street2":null,"city":null,"stateOrCountry":null,"zipCode":null,"stateOrCountryDescription":null,"isForeignLocation":null,"foreignStateTerritory":null,"country":null,"countryCode":null}},"phone":null,"flags":"","formerNames":[],"filings":{"recent":{"accessionNumber":["0001193125-26-294703","0000950170-25-091579","0000950170-24-074882","0000950170-23-030758","0000899243-22-024523","0000899243-21-047542","0000899243-21-047522"],"filingDate":["2026-07-02","2025-06-30","2024-06-18","2023-06-29","2022-06-29","2021-12-09","2021-12-09"],"reportDate":["2026-06-30","2025-06-26","2024-06-17","2023-06-27","2022-06-27","2021-12-08","2021-12-08"],"acceptanceDateTime":["2026-07-02T20:30:33.000Z","2025-06-30T20:15:07.000Z","2024-06-18T20:20:03.000Z","2023-06-29T20:16:51.000Z","2022-06-29T21:00:31.000Z","2021-12-09T21:30:24.000Z","2021-12-09T21:15:12.000Z"],"act":["34","34","34","34","34","34","34"],"form":["4","4","4","4","4","4","3"],"fileNumber":["001-38978","001-38978","001-38978","001-38978","001-38978","001-38978","001-38978"],"filmNumber":["261151885","251092193","241052088","231057597","221055358","211482318","211482118"],"items":["","","","","","",""],"core_type":["4","4","4","4","4","4","3"],"size":[5442,5305,5313,5231,10069,5303,8057],"isXBRL":[0,0,0,0,0,0,0],"isInlineXBRL":[0,0,0,0,0,0,0],"isXBRLNumeric":[0,null,null,null,null,null,null],"primaryDocument":["xslF345X06/ownership.xml","xslF345X05/ownership.xml","xslF345X05/ownership.xml","xslF345X04/ownership.xml","xslF345X03/doc4.xml","xslF345X03/doc4.xml","xslF345X02/doc3.xml"],"primaryDocDescription":["4","4","4","4","FORM 4 SUBMISSION","FORM 4 SUBMISSION","FORM 3 SUBMISSION"]},"files":[]}}