| JSM Partners Limited | Professional & scientific | 2018 |
| JSM PB Ltd | Hospitality | 2025 |
| JSM Real Estate Limited | Real estate | 2020 |
| JSS Electrical Services Limited | Construction | 2014 |
| JSS Property Investments Ltd | Real estate | 2017 |
| JT Event Consulting Ltd | Professional & scientific | 2018 |
| JT Kitchens Ltd | Construction | 2013 |
| JT Scientific Services Ltd | Professional & scientific | 2022 |
| JT68 Holdings Limited | Financial services | 2024 |
| JT68 Leisure Limited | Construction | 2024 |
| Jtech CAD Services Ltd | Professional & scientific | 2015 |
| Jtech IT Support Limited | Information & communication | 2016 |
| JTL Logistics Ltd | Transport & logistics | 2019 |
| Jtrans Limited | Transport & logistics | 2014 |
| JTW Property Limited | Real estate | 2024 |
| Juanjose Ltd | Construction | 2018 |
| Juba Utilities Ltd | Information & communication | 2022 |
| Jubeka Medical Ltd | Health & social care | 2023 |
| Jubelu Ltd | Administrative & support | 2025 |
| Jubilee Capital Investments Ltd | Real estate | 2026 |
| Judymowa Ltd | Health & social care | 2026 |
| Juice Energy Limited | Professional & scientific | 2018 |
| Juicy Properties Ltd | Real estate | 2022 |
| Juicy Vibes Ltd | Wholesale & retail | 2024 |
| Juicy Vibes March Ltd | Wholesale & retail | 2025 |
| Julia Premier Ltd | Wholesale & retail | 2022 |
| Julia Trade Ltd | Wholesale & retail | 2020 |
| Julian Taylor Services Ltd | Construction | 2004 |
| Julie Howard Communications & Events Ltd | Professional & scientific | 2025 |
| Julu Holdings Limited | Professional & scientific | 2024 |
| Julyban Services Ltd | Wholesale & retail | 2017 |
| Julyfourth Services Ltd | Professional & scientific | 2019 |
| Jump and Rise Ltd | Wholesale & retail | 2021 |
| Jumpcross Limited | Arts & recreation | 2000 |
| Jumped UP Theatre | Arts & recreation | 2001 |
| Junanicreation Ltd | Wholesale & retail | 2022 |
| Junction 17 (Grantham) Limited | Administrative & support | 2023 |
| Junction 17 (Rugby) Limited | Wholesale & retail | 2024 |
| Junction 17 Cars Limited | Wholesale & retail | 2010 |
| Junction 17 Limited | Real estate | 2014 |
| Junction 17 Motors Limited | Wholesale & retail | 2012 |
| Junction 17 Prestige Limited | Wholesale & retail | 2016 |
| Juniper Management Solutions Limited | Information & communication | 2009 |
| Juno Club Limited | Professional & scientific | 2025 |
| Juno Court Management Limited | Real estate | 2001 |
| Juodulys Ltd | Transport & logistics | 2024 |
| Jupiter Healthcare Company Limited | Health & social care | 2013 |
| Jurij Transport Ltd | Transport & logistics | 2017 |
| Jurtrans Limited | Transport & logistics | 2022 |
| Jusa Travel Ltd | Transport & logistics | 2026 |
| Juschima Asepsis Limited | Other services | 2014 |
| Just BEE Books Ltd | Information & communication | 2021 |
| Just DO Sport Ltd | Arts & recreation | 2020 |
| Just Grill Ltd | Hospitality | 2014 |
| Just Jamaica Limited | Administrative & support | 2018 |
| Just Lets (Peterborough) Ltd | Real estate | 2004 |
| Just Lets Property Management Limited | Professional & scientific | 1999 |
| Just Love & Music Limited | Information & communication | 2020 |
| Just Media Solutions Ltd | Professional & scientific | 2015 |
| Just Mist Co Ltd | Wholesale & retail | 2026 |
| Just Representation Ltd | Professional & scientific | 2008 |
| Just Retreats Ltd | Hospitality | 2016 |
| Justmeatuk Limited | Hospitality | 2019 |
| Justmoh Construction Ltd | Construction | 2021 |
| Justrachael Ltd | Professional & scientific | 2021 |
| Justrish Ltd | Wholesale & retail | 2025 |
| Juwex Logistics Ltd | Administrative & support | 2025 |
| JV Drylining Ltd | Construction | 2026 |
| JV Empires Ltd | Administrative & support | 2021 |
| JV Family Limited | Real estate | 2026 |
| JV Sales Ltd | Wholesale & retail | 2022 |
| JV T.R.W. (Holdings) Ltd | Financial services | 2025 |
| JVB Media Ltd | Information & communication | 2020 |
| JVB Mentoring Limited | Professional & scientific | 2016 |
| JVD Transport Ltd | Transport & logistics | 2022 |
| Jvdeals Ltd | Wholesale & retail | 2025 |
| JVS Consultancy Limited | Professional & scientific | 2014 |
| JW and MA Rowlett LLP | | 2021 |
| JW Dutch Creative Ltd | Professional & scientific | 2021 |
| JW77 Properties Ltd | Real estate | 2021 |
| K & Anush Ltd | Wholesale & retail | 2024 |
| K & D Heating & Plumbing Ltd | Construction | 2013 |
| K & H Accountants Limited | Professional & scientific | 2004 |
| K & K Fusion Ltd | Hospitality | 2026 |
| K & K Hardware Ltd | Wholesale & retail | 2022 |
| K & M UK Logistic Ltd | Transport & logistics | 2026 |
| K & S Recruitment Services LP | | 2016 |
| K & W Enterprises Limited | Real estate | 2021 |
| K & Z Transport Ltd | Transport & logistics | 2025 |
| K a Heating Solutions Ltd | Construction | 2024 |
| K and E Pro Aesthetics Ltd | Other services | 2021 |
| K B Manak Limited | Real estate | 2021 |
| K D Chudasama Ltd | Other services | 2024 |
| K Dolan Groundworks Ltd | Construction | 2005 |
| K E B Holdings Limited | Real estate | 2026 |
| K E Dawson & Sons Ltd | Agriculture & fishing | 2016 |
| K Eleven Limited | Construction | 2019 |
| K F Bright & Sons Ltd | Administrative & support | 2010 |
| K Farooq Properties Limited | Households | 2022 |
| K Four Autos Limited | Wholesale & retail | 2016 |