{"cik":"0001796398","entityType":"other","sic":"","sicDescription":"","ownerOrg":"","insiderTransactionForOwnerExists":1,"insiderTransactionForIssuerExists":0,"name":"Backstrom Jay T.","tickers":[],"exchanges":[],"ein":null,"lei":null,"description":"","website":"","investorWebsite":"","category":"","fiscalYearEnd":null,"stateOfIncorporation":"","stateOfIncorporationDescription":"","addresses":{"mailing":{"street1":"SCHOLAR ROCK HOLDING CORPORATION","street2":"301 BINNEY STREET, 3RD FLOOR","city":"CAMBRIDGE","stateOrCountry":"MA","zipCode":"02142","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":["0001439222-26-000112","0001439222-26-000079","0001796398-25-000004","0001439222-25-000080","0001439222-25-000078","0001415889-25-007839","0001415889-25-004915","0001415889-25-004528","0001415889-25-001795","0001415889-25-000013","0001415889-24-004379","0001415889-24-003630","0001415889-23-002611","0000899243-23-000296","0000899243-23-000277","0001104659-22-102341","0001104659-22-102338","0001104659-21-142267","0001179110-21-001117","0001179110-21-000366","0001179110-20-001410","0001179110-20-000268","0001179110-19-012952"],"filingDate":["2026-07-10","2026-06-23","2025-11-17","2025-07-10","2025-07-10","2025-03-12","2025-02-20","2025-02-18","2025-01-21","2025-01-02","2024-02-20","2024-02-13","2023-02-15","2023-01-03","2023-01-03","2022-09-22","2022-09-22","2021-11-22","2021-02-02","2021-01-06","2020-02-10","2020-01-03","2019-12-17"],"reportDate":["2026-07-08","2026-06-18","2025-11-13","2025-07-08","2025-07-08","2025-03-10","2025-02-18","2025-02-13","2025-01-16","2025-01-01","2024-02-16","2024-02-12","2023-02-13","2022-12-29","2022-12-29","2022-09-20","2022-09-20","2021-11-19","2021-01-29","2021-01-04","2020-01-02","2020-01-02","2019-12-10"],"acceptanceDateTime":["2026-07-10T20:18:00.000Z","2026-06-23T21:12:22.000Z","2025-11-17T21:30:14.000Z","2025-07-10T20:14:25.000Z","2025-07-10T20:12:22.000Z","2025-03-12T21:00:15.000Z","2025-02-20T22:41:51.000Z","2025-02-19T01:15:15.000Z","2025-01-21T21:35:19.000Z","2025-01-02T14:28:10.000Z","2024-02-20T21:46:17.000Z","2024-02-14T00:17:19.000Z","2023-02-15T21:37:37.000Z","2023-01-03T22:05:23.000Z","2023-01-03T22:00:22.000Z","2022-09-22T20:16:18.000Z","2022-09-22T20:15:23.000Z","2021-11-22T14:04:07.000Z","2021-02-03T00:15:18.000Z","2021-01-07T00:05:38.000Z","2020-02-10T23:01:18.000Z","2020-01-04T02:32:06.000Z","2019-12-17T23:19:58.000Z"],"act":["34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34"],"form":["4","4","4","4","3","4","4","4","4","3","4","4","4","4","3","4","3","4","4","4","4/A","4","3"],"fileNumber":["001-36014","001-36014","001-40241","001-36014","001-36014","001-38501","001-38501","001-40241","001-38501","001-40241","001-38501","001-38501","001-38501","001-39438","001-39438","001-38501","001-38501","001-36065","001-36065","001-36065","001-36065","001-36065","001-36065"],"filmNumber":["261168931","261112113","251491411","251116468","251116457","25732509","25647548","25636879","25542944","25500513","24654323","24631087","23635887","23503096","23503006","221259408","221259390","211430344","21583422","21512358","20593232","20507929","191290833"],"items":["","","","","","","","","","","","","","","","","","","","","","",""],"core_type":["4","4","4","4","3","4","4","4","4","3","4","4","4","4","3","4","3","4","4","4","4/A","4","3"],"size":[7070,7963,6012,7825,408935,7776,5761,5529,5760,13714,5761,7741,7744,5638,10206,5476,10336,10679,6592,4394,5846,6690,6418],"isXBRL":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"isInlineXBRL":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"isXBRLNumeric":[0,0,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"primaryDocument":["xslF345X06/wk-form4_1783714678.xml","xslF345X06/wk-form4_1782249139.xml","xslF345X05/form4-11172025_041109.xml","xslF345X05/wk-form4_1752178459.xml","xslF345X02/wk-form3_1752178329.xml","xslF345X05/form4-03122025_050311.xml","xslF345X05/form4-02202025_100247.xml","xslF345X05/form4-02182025_080212.xml","xslF345X05/form4-01212025_040115.xml","xslF345X02/form3-01022025_020106.xml","xslF345X05/form4-02202024_090207.xml","xslF345X05/form4-02142024_120208.xml","xslF345X03/form4-02152023_090222.xml","xslF345X03/doc4.xml","xslF345X02/doc3.xml","xslF345X03/tm2226370-2_4seq1.xml","xslF345X02/tm2226370-1_3seq1.xml","xslF345X03/tm2133601-3_4seq1.xml","xslF345X03/edgar.xml","xslF345X03/edgar.xml","xslF345X03/edgar.xml","xslF345X03/edgar.xml","xslF345X02/edgar.xml"],"primaryDocDescription":["FORM 4","FORM 4","","FORM 4","FORM 3","","","","","","","","","FORM 4 SUBMISSION","FORM 3 SUBMISSION","OWNERSHIP DOCUMENT","OWNERSHIP DOCUMENT","OWNERSHIP DOCUMENT","FORM 4 -","FORM 4 -","FORM 4/A -","FORM 4 -","FORM 3 -"]},"files":[]}}