{"cik":"0001844161","entityType":"other","sic":"","sicDescription":"","ownerOrg":"","insiderTransactionForOwnerExists":0,"insiderTransactionForIssuerExists":0,"name":"Arch Investment Management Ltd.","tickers":[],"exchanges":[],"ein":"980602504","lei":null,"description":"","website":"","investorWebsite":"","category":"","fiscalYearEnd":"1231","stateOfIncorporation":"D0","stateOfIncorporationDescription":"Bermuda","addresses":{"mailing":{"street1":"WATERLOO HOUSE","street2":"100 PITTS BAY ROAD","city":"PEMBROKE","stateOrCountry":"D0","zipCode":"HM08","stateOrCountryDescription":"Bermuda","isForeignLocation":0,"foreignStateTerritory":null,"country":null,"countryCode":null},"business":{"street1":"WATERLOO HOUSE","street2":"100 PITTS BAY ROAD","city":"PEMBROKE","stateOrCountry":"D0","zipCode":"HM08","stateOrCountryDescription":"Bermuda","isForeignLocation":null,"foreignStateTerritory":null,"country":null,"countryCode":null}},"phone":"441-278-9180","flags":"","formerNames":[],"filings":{"recent":{"accessionNumber":["0001844161-26-000014","0001844161-26-000011","0001844161-26-000008","0001844161-26-000003","0001844161-25-000012","0001844161-25-000009","0001844161-25-000006","0001844161-25-000002","0001844161-24-000017","0001844161-24-000011","0001844161-24-000008","0001844161-24-000003","0001844161-23-000013","0001844161-23-000010","0001844161-23-000007","0001844161-23-000004","0001844161-22-000016","0001844161-22-000011","0001844161-22-000008","0001844161-22-000005","0001844161-21-000018","0001844161-21-000013","0001844161-21-000007","0001844161-21-000004"],"filingDate":["2026-11-04","2026-08-04","2026-05-05","2026-02-09","2025-11-06","2025-08-05","2025-05-07","2025-02-10","2024-11-07","2024-08-06","2024-05-09","2024-02-14","2023-11-09","2023-08-02","2023-05-04","2023-02-24","2022-11-03","2022-08-03","2022-05-04","2022-02-25","2021-11-04","2021-08-05","2021-05-06","2021-02-16"],"reportDate":["2026-09-30","2026-06-30","2026-03-31","2025-12-31","2025-09-30","2025-06-30","2025-03-31","2024-12-31","2024-09-30","2024-06-30","2024-03-31","2023-12-31","2023-09-30","2023-06-30","2023-03-31","2022-12-31","2022-09-30","2022-06-30","2022-03-31","2021-12-31","2021-09-30","2021-06-30","2021-03-31","2020-12-31"],"acceptanceDateTime":["2026-11-04T21:08:53.000Z","2026-08-04T21:04:23.000Z","2026-05-05T13:07:42.000Z","2026-02-09T21:28:00.000Z","2025-11-06T21:47:34.000Z","2025-08-05T20:47:30.000Z","2025-05-07T20:08:15.000Z","2025-02-10T21:10:08.000Z","2024-11-07T21:35:24.000Z","2024-08-06T20:42:29.000Z","2024-05-09T20:25:18.000Z","2024-02-14T21:20:25.000Z","2023-11-09T20:14:25.000Z","2023-08-02T19:07:36.000Z","2023-05-04T16:13:07.000Z","2023-02-24T18:17:05.000Z","2022-11-03T18:56:31.000Z","2022-08-03T19:40:09.000Z","2022-05-04T21:17:52.000Z","2022-02-25T15:41:07.000Z","2021-11-04T19:42:25.000Z","2021-08-05T18:51:06.000Z","2021-05-06T18:59:11.000Z","2021-02-16T21:06:02.000Z"],"act":["34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34","34"],"form":["13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT"],"fileNumber":["028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966","028-20966"],"filmNumber":["261522232","261239967","26940816","26611851","251459238","251185723","25921376","25605841","241436450","241180044","24931128","24638701","231391934","231135094","23887431","23665366","221357550","221132339","22892649","22675640","211379696","211147621","21897272","21638095"],"items":["","","","","","","","","","","","","","","","","","","","","","","",""],"core_type":["13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT","13F-NT"],"size":[3066,3068,3067,3067,3068,3068,3067,3074,3075,3075,3074,3074,3042,3003,3002,3002,2961,2964,2963,2978,2961,2960,2968,2932],"isXBRL":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"isInlineXBRL":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"isXBRLNumeric":[0,0,0,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"primaryDocument":["xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X02/primary_doc.xml","xslForm13F_X01/primary_doc.xml","xslForm13F_X01/primary_doc.xml","xslForm13F_X01/primary_doc.xml","xslForm13F_X01/primary_doc.xml","xslForm13F_X01/primary_doc.xml","xslForm13F_X01/primary_doc.xml","xslForm13F_X01/primary_doc.xml","xslForm13F_X01/primary_doc.xml"],"primaryDocDescription":["","","","","","","","","","","","","","","","","","","","","","","",""]},"files":[]}}