{"cik":"0002069244","entityType":"other","sic":"","sicDescription":"","ownerOrg":"","insiderTransactionForOwnerExists":0,"insiderTransactionForIssuerExists":1,"name":"FT Vest Total Return Income Fund: Series B4","tickers":[],"exchanges":[],"ein":"000000000","lei":null,"description":"","website":"","investorWebsite":"","category":"","fiscalYearEnd":"1231","stateOfIncorporation":"DE","stateOfIncorporationDescription":"DE","addresses":{"mailing":{"street1":"235 WEST GALENA STREET","street2":null,"city":"MILWAUKEE","stateOrCountry":"WI","zipCode":"53212","stateOrCountryDescription":"WI","isForeignLocation":0,"foreignStateTerritory":null,"country":null,"countryCode":null},"business":{"street1":"235 WEST GALENA STREET","street2":null,"city":"MILWAUKEE","stateOrCountry":"WI","zipCode":"53212","stateOrCountryDescription":"WI","isForeignLocation":null,"foreignStateTerritory":null,"country":null,"countryCode":null}},"phone":"4142992270","flags":"","formerNames":[],"filings":{"recent":{"accessionNumber":["0001104659-26-105336","0001193125-26-374101","0001104659-26-101570","0001193125-26-235990","0001104659-26-039059","0002069244-26-000001","0001213900-26-007647","0001213900-26-007643","0001604488-26-000003","0001732966-26-000002","0001732802-26-000002","0001104659-25-123763","0001104659-25-097863","0001104659-25-097801"],"filingDate":["2026-09-04","2026-08-28","2026-08-26","2026-05-22","2026-04-02","2026-01-28","2026-01-26","2026-01-26","2026-01-26","2026-01-26","2026-01-26","2025-12-22","2025-10-08","2025-10-08"],"reportDate":["2026-06-30","2026-06-30","2026-06-30","2026-03-31","","","2026-01-23","2026-01-23","2026-01-23","2026-01-23","2026-01-23","","",""],"acceptanceDateTime":["2026-09-04T14:31:01.000Z","2026-08-28T19:13:07.000Z","2026-08-26T20:44:42.000Z","2026-05-22T16:15:44.000Z","2026-04-02T18:06:58.000Z","2026-01-28T21:52:49.000Z","2026-01-26T19:41:07.000Z","2026-01-26T19:38:13.000Z","2026-01-26T19:15:11.000Z","2026-01-26T19:04:50.000Z","2026-01-26T18:58:52.000Z","2025-12-22T21:32:04.000Z","2025-10-08T17:46:15.000Z","2025-10-08T14:19:40.000Z"],"act":["40","40","40","40","40","33","","","","","","40","40","40"],"form":["N-CSRS","NPORT-P","N-PX","NPORT-P","40-17G","D","3","3","3","3","3","POS AMI","N-2","N-8A"],"fileNumber":["811-24125","811-24125","811-24125","811-24125","811-24125","021-571490","","","","","","811-24125","811-24125","811-24125"],"filmNumber":["261360560","261338984","261323618","261012105","26832232","26573276","","","","","","251592914","251381872","251381428"],"items":["","","","","","06c","","","","","","","",""],"core_type":["N-CSRS","NPORT-P","N-PX","NPORT-P","40-17G","D","3","3","3","3","3","XBRL","XBRL","N-8A"],"size":[1083187,284838,929882,651820,970713,15246,8283,2838,3800,3908,3831,1948188,4076206,12129],"isXBRL":[0,0,0,0,0,0,0,0,0,0,0,1,1,0],"isInlineXBRL":[0,0,0,0,0,0,0,0,0,0,0,1,1,0],"isXBRLNumeric":[0,0,0,0,null,null,null,null,null,null,null,null,null,null],"primaryDocument":["tm2622754d2_ncsrs.htm","xslFormNPORT-P_X01/primary_doc.xml","xslN-PX_X01/primary_doc.xml","xslFormNPORT-P_X01/primary_doc.xml","tm2610086d7_4017g.pdf","xslFormDX01/primary_doc.xml","xslF345X02/ownership.xml","xslF345X02/ownership.xml","xslF345X02/primary_doc.xml","xslF345X02/primary_doc.xml","xslF345X02/primary_doc.xml","tm2533704d1_posami.htm","tm2527792d2_n2.htm","tm2527792d1_n8a.htm"],"primaryDocDescription":["N-CSRS","","","","40-17G","","","","PRIMARY DOCUMENT","PRIMARY DOCUMENT","PRIMARY DOCUMENT","POS AMI","N-2","N-8A"]},"files":[]}}