{"cik":"0002064355","entityType":"operating","sic":"6770","sicDescription":"Blank Checks","ownerOrg":"05 Real Estate & Construction","insiderTransactionForOwnerExists":0,"insiderTransactionForIssuerExists":1,"name":"Bain Capital GSS Investment Corp.","tickers":["BCSS","BCSS-UN","BCSS-WT"],"exchanges":["NYSE","NYSE","NYSE"],"ein":"000000000","lei":null,"description":"","website":"","investorWebsite":"","category":"Non-accelerated filer
Smaller reporting company
Emerging growth company","fiscalYearEnd":"1231","stateOfIncorporation":"","stateOfIncorporationDescription":"","addresses":{"mailing":{"street1":"200 CLARENDON STREET","street2":null,"city":"BOSTON","stateOrCountry":"MA","zipCode":"02116","stateOrCountryDescription":"MA","isForeignLocation":0,"foreignStateTerritory":null,"country":null,"countryCode":null},"business":{"street1":"121 SOUTH CHURCH STREET","street2":"UGLAND HOUSE","city":"GEORGE TOWN","stateOrCountry":null,"zipCode":"KY1-1104","stateOrCountryDescription":null,"isForeignLocation":1,"foreignStateTerritory":null,"country":"Cayman Islands","countryCode":"E9"}},"phone":"6175162000","flags":"","formerNames":[],"filings":{"recent":{"accessionNumber":["0001214659-26-006434","0001688382-26-000008","0001193125-26-224313","0001193125-26-117644","0001214659-26-001997","0001688382-26-000003","0001193125-26-051410","0001193125-26-048768","0000902664-26-000885","0001193125-25-329104","0001193125-25-328932","0001193125-25-325746","0001193125-25-288840","0001193125-25-283130","0001193125-25-240258","0001193125-25-233659","0001193125-25-227280","0001193125-25-227049","0001193125-25-227043","0001193125-25-227032","0001193125-25-226995","0001193125-25-226971","0001193125-25-226937","0001193125-25-225161","9999999995-25-003146","0000876661-25-000714","0001193125-25-221832","0001193125-25-217461","0001193125-25-217452","0001193125-25-206059","0001193125-25-206050","0000000000-25-010017","0001193125-25-199207","0001193125-25-199062","0000000000-25-008400","0000950123-25-006899","0000950123-25-006897","0000000000-25-007290","0000950123-25-006030"],"filingDate":["2026-05-15","2026-05-15","2026-05-14","2026-03-20","2026-02-17","2026-02-17","2026-02-13","2026-02-12","2026-02-12","2025-12-22","2025-12-22","2025-12-19","2025-11-20","2025-11-14","2025-10-15","2025-10-07","2025-10-02","2025-10-01","2025-10-01","2025-10-01","2025-10-01","2025-10-01","2025-10-01","2025-09-30","2025-09-29","2025-09-29","2025-09-29","2025-09-25","2025-09-25","2025-09-17","2025-09-17","2025-09-16","2025-09-09","2025-09-09","2025-08-11","2025-08-01","2025-08-01","2025-07-10","2025-06-13"],"reportDate":["","","2026-03-31","2025-12-31","","","2026-02-11","2026-02-11","","2025-12-18","2025-12-18","2025-12-18","2025-11-20","2025-09-30","","2025-10-01","2025-09-29","2025-09-29","2025-09-29","2025-09-29","2025-09-29","2025-09-29","2025-09-29","","","","","","","","","","","","","","","",""],"acceptanceDateTime":["2026-05-15T20:00:35.000Z","2026-05-15T16:56:27.000Z","2026-05-14T21:12:20.000Z","2026-03-20T20:10:44.000Z","2026-02-17T21:00:12.000Z","2026-02-17T19:48:41.000Z","2026-02-13T21:15:03.000Z","2026-02-12T21:15:49.000Z","2026-02-12T14:01:44.000Z","2025-12-22T23:55:25.000Z","2025-12-22T22:07:57.000Z","2025-12-19T11:45:43.000Z","2025-11-20T11:50:36.000Z","2025-11-14T21:31:32.000Z","2025-10-15T20:10:02.000Z","2025-10-07T21:20:54.000Z","2025-10-02T00:51:58.000Z","2025-10-01T21:30:37.000Z","2025-10-01T21:28:53.000Z","2025-10-01T21:25:11.000Z","2025-10-01T21:14:46.000Z","2025-10-01T21:08:30.000Z","2025-10-01T21:01:20.000Z","2025-09-30T20:45:40.000Z","2025-09-30T04:15:13.000Z","2025-09-29T14:09:46.000Z","2025-09-29T13:00:07.000Z","2025-09-25T20:12:36.000Z","2025-09-25T20:10:48.000Z","2025-09-17T19:17:05.000Z","2025-09-17T19:12:30.000Z","2025-09-16T16:36:07.000Z","2025-09-09T20:29:42.000Z","2025-09-09T18:07:52.000Z","2025-08-11T18:36:06.000Z","2025-08-01T18:19:18.000Z","2025-08-01T18:14:28.000Z","2025-07-10T21:36:05.000Z","2025-06-13T14:33:57.000Z"],"act":["34","34","34","34","34","34","","34","34","","","34","34","34","34","34","34","","","","","","","33","33","34","34","","","","33","","","33","","","33","","33"],"form":["SCHEDULE 13G/A","SCHEDULE 13G/A","10-Q","10-K","SCHEDULE 13G","SCHEDULE 13G","3","8-K","SCHEDULE 13G","3","4","8-K","8-K","10-Q","SCHEDULE 13G","8-K","8-K","3","3","3","3","3","3","424B4","EFFECT","CERT","8-A12B","CORRESP","CORRESP","CORRESP","S-1/A","UPLOAD","CORRESP","S-1","UPLOAD","DRSLTR","DRS/A","UPLOAD","DRS"],"fileNumber":["005-95273","005-95273","001-42874","001-42874","005-95273","005-95273","","001-42874","005-95273","","","001-42874","001-42874","001-42874","005-95273","001-42874","001-42874","","","","","","","333-290126","333-290126","001-42874","001-42874","","","","333-290126","377-08103","","333-290126","377-08103","","377-08103","377-08103","377-08103"],"filmNumber":["26986601","26985042","26980387","26778339","26640620","26639907","","26626402","26623648","","","251585015","251500969","251487183","251394930","251380645","251366389","","","","","","","251361150","251358016","251352964","251352452","","","","251319776","","","251302710","","","251175522","","251045077"],"items":["","","","","","","","5.02,9.01","","","","5.02,9.01","8.01,9.01","","","8.01,9.01","1.01,3.02,5.02,5.03,8.01,9.01","","","","","","","",",,","","","","","","","","","","","","","",""],"core_type":["SCHEDULE 13G/A","SCHEDULE 13G/A","XBRL","XBRL","SCHEDULE 13G","SCHEDULE 13G","3","XBRL","SCHEDULE 13G","3","4","XBRL","XBRL","XBRL","SCHEDULE 13G","XBRL","XBRL","3","3","3","3","3","3","424B4","EFFECT","CERT","8-A12B","CORRESP","CORRESP","CORRESP","XBRL","LETTER","CORRESP","XBRL","LETTER","DRSLTR","DRS/A","LETTER","DRS"],"size":[13581,10866,3527323,4670906,13693,77648,4470,190841,16131,4495,6600,189918,197915,3147354,6714,337965,1358962,7742,2919,4507,2881,2930,2927,1821173,1777,403697,15787,6929,7275,23752,3581493,45843,19490,5432668,44024,20420,2912972,46694,2026016],"isXBRL":[0,0,1,1,0,0,0,1,0,0,0,1,1,1,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0],"isInlineXBRL":[0,0,1,1,0,0,0,1,0,0,0,1,1,1,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0],"isXBRLNumeric":[0,0,1,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"primaryDocument":["xslSCHEDULE_13G_X02/primary_doc.xml","xslSCHEDULE_13G_X02/primary_doc.xml","d150582d10q.htm","d76448d10k.htm","xslSCHEDULE_13G_X01/primary_doc.xml","xslSCHEDULE_13G_X01/primary_doc.xml","xslF345X02/ownership.xml","d101238d8k.htm","xslSCHEDULE_13G_X01/primary_doc.xml","xslF345X02/ownership.xml","xslF345X05/ownership.xml","d30155d8k.htm","d858924d8k.htm","d87018d10q.htm","xslSCHEDULE_13G_X01/primary_doc.xml","d99409d8k.htm","d54660d8k.htm","xslF345X02/ownership.xml","xslF345X02/ownership.xml","xslF345X02/ownership.xml","xslF345X02/ownership.xml","xslF345X02/ownership.xml","xslF345X02/ownership.xml","d947702d424b4.htm","xslEFFECTX01/primary_doc.xml","BCSS092925.pdf","d870144d8a12b.htm","filename1.htm","filename1.htm","filename1.htm","d947702ds1a.htm","filename1.pdf","filename1.htm","d947702ds1.htm","filename1.pdf","filename1.htm","filename1.htm","filename1.pdf","filename1.htm"],"primaryDocDescription":["","","10-Q","10-K","","","3","8-K","","3","4","8-K","8-K","10-Q","","8-K","8-K","3","3","3","3","3","3","424B4","","NYSE CERTIFICATION","8-A12B","","","","S-1/A","","","S-1","","","","",""]},"files":[]}}